TWI657437B - Electric vehicle and method for playing, generating associated audio signals - Google Patents

Abstract

The present disclosure is directed to a method, apparatus, and system for playing an audio signal associated with an electric vehicle. For example, the method includes (1) determining a speed of the electric vehicle; (2) receiving a plurality of sound frequency characteristics corresponding to the determined speed of the electric vehicle from the memory; and (3) using a speaker of the electric vehicle The received sound frequency signature produces an audio signal segment. The sound frequency feature includes a plurality of segments, each of the segments comprising an amplitude of a plurality of frequency features in a sound produced by a powertrain (eg, an electric motor) over a range of speeds.

Description

Electric vehicle and play, produce related sounds Frequency signal method

The present technology is generally directed to a method and system for generating an audio signal associated with an electric motor of an electric vehicle. In particular, the present technology relates to a system for simulating an electric motor (or electric motor) in a range of speeds and playing a similar sound when the electric vehicle is operated in the speed range to remind The presence of other people's electric vehicles.

In general, electric motors are quieter than conventional internal combustion engines, especially when the electric motor is just starting to run (for example, when the speed is low). However, in the case of security considerations, some countries/jurisdictions may require electric vehicles to provide certain sounds as warnings or instructions for their existence. Accordingly, it would be advantageous to have a device, system, and method that meets the above needs.

The following summary is provided to facilitate the reader and to identify several representative embodiments of the disclosed technology. In general, the present technology provides an improved system and method for generating an electric motor with an electric vehicle (or a powertrain that can have an electric motor, a drive belt, a transmission gear set, or other electric motor driven Suitable device) related audio signal. The present technology is a way to generate and play a sound that mimics the electric vehicle at different speeds. In one embodiment, the sound from the electric motor of the electric vehicle is sampled within a sampling range that is sufficiently loud enough to be detected (eg, the electric vehicle moves at 15 to 30 kilometers per hour (KPH)). The sampled sound is analyzed and measured to identify a particular frequency characteristic (eg, to identify a particular frequency corresponding to a significant sound wave). Based on the identified frequency characteristics, a set of audio signals corresponding to a larger target range (eg, an electric vehicle moving at 0 kilometers per hour to its maximum speed) is synthesized. With this configuration, the present technology can produce an audio signal that provides continuous, smooth, and natural sound to the operator or other bystander when the electric vehicle is operating at any speed within the target range. The technology also allows the user to customize the sound of the electric vehicle to create a variety of themes, thereby enhancing the overall user experience.

Another aspect of the present technology includes providing a method for analyzing sound (tire sound, brakes, etc.) of an electric motor or other device on a carrier. In the process of analysis, the technology can recognize a plurality of main characteristic frequencies and their homophonic sounds from the measured sounds. In some embodiments, a plot of the amplitude of the identified frequency versus the speed of the vehicle is plotted over a range of sound audible speeds. Subsequently, the amplitude versus velocity curve of the identified frequency can be interpolated or otherwise synthesized to a speed at which the sound of the vehicle is generally inaudible. Degree range. A waveform is generated from the interpolated or measured frequency signature that represents the sound of the vehicle at any speed (0 to maximum speed). The technique can extrapolate, interpolate, or otherwise fit the identified frequency characteristic curve to produce a processed frequency characteristic curve in any range (eg, within the operational range of the electric motor), including none Corresponding measurement range of sound.

During operation of the vehicle, the composite waveform is played through the speaker so that bystanders can hear the vehicle approaching. In some embodiments, as shown in FIG. 5 and FIG. 6, the waveform is further processed by a "fade in" or "fade out" function, so that the artificial sound sounds natural (at a lower speed) and is integrated. With actual sound (at higher speeds).

The present technology also provides a method for playing a smooth, continuous sound corresponding to an electric motor or other suitable device. For example, a synthesized sound file can be divided into a plurality of segments or fragments. In one embodiment, each of the segments corresponds to a particular speed (eg, one segment or segment per speed unit, as shown in FIG. 6). For example, one segment corresponds to a speed of 11 kilometers per hour, another segment corresponds to a speed of 12 kilometers per hour, and so on. Other correspondences are of course possible, for example: one segment corresponds to a range of speeds of 2 to 4 kilometers per hour, another segment corresponds to a range of 4 to 6 kilometers per hour, and so on. The technique plays the segment or segment depending on the current condition of the electric vehicle, such as the current speed of movement. To enhance the user experience of the actual generated sound, the clip is played in a manner that minimizes discontinuity. In one embodiment, as described in detail with reference to FIGS. 7-9, the segments are played in the forward direction during acceleration, played in reverse during deceleration, and played in forward and reverse directions during constant speed movement.

In some embodiments, the disclosed techniques can generate various types of sound based on sound from an electric motor to provide a customized user experience. For example, the claimed technique can measure the sound from an electric motor, analyze the sound at multiple fundamental frequencies, and identify the characteristics of the measured sound. The disclosed technique can then adjust the characteristics of the sound by increasing or decreasing the amplitude of the acoustic waves at the fundamental frequency.

In some embodiments, the disclosed techniques can generate or simulate sound based on user manipulation of the electric motor. For example, when a user operates an electric motor, the requested technology can adjust the sound of the electric motor to sound like a super sports car, sports car, train, truck, other type of vehicle or device, and the like.

In some embodiments, the disclosed techniques enable a user to customize the sound of an electric motor to enhance the user experience and the enjoyment of operation. For example, a user can make an electric motor sound like a whirring spacecraft (for example, to simulate something from the future). With this configuration, the disclosed technology can be enhanced by the user experience when operating an electric motor. In some embodiments, the disclosed techniques can produce analog sounds that correspond to user actions. In such embodiments, when the user requests the electric motor to increase its output power, the requested technique may correspondingly increase the volume of the simulated sound.

In some embodiments, sound from an electric motor or other device can be measured, analyzed, and played in an instant manner. In such embodiments, for example, the disclosed techniques may first measure/analyze the sound of the electric motor and then produce a simulated sound in a short period of time. In some embodiments, The requested technique can continuously or periodically monitor the sound of the electric motor and adjust the simulated sound accordingly.

In some embodiments, the present disclosure can be implemented as a method for playing an audio signal associated with an electric vehicle. For example, the method may include: (1) determining a speed of the electric vehicle; (2) receiving a plurality of sound frequency characteristics corresponding to the determined electric vehicle speed from the memory; and (3) generating a corresponding corresponding An audio signal segment of the received sound frequency characteristic; and (4) playing the audio signal segment with the speaker of the electric vehicle. The sound frequency characteristic can include a plurality of segments, each of the segments can include amplitudes of a plurality of frequency features in the sound produced by the powertrain over a range of speeds.

In some embodiments, the present disclosure can be implemented as an electric vehicle. For example, the electric vehicle can include: (1) a processor; (2) a powertrain coupled to the processor; and (3) a memory coupled to the processor configured to store a plurality of loads corresponding to the electric vehicle Sound frequency characteristics; and (4) speakers configured to play audio signal segments. The sound frequency characteristic can include a plurality of segments, each of the segments can include amplitudes of a plurality of frequency features in the sound produced by the powertrain over a range of speeds. The processor is configured to generate an audio signal segment based on the moving speed of the electric vehicle and the sound frequency characteristics.

In some embodiments, the present disclosure may be implemented as a system that can issue a vehicle sound for pedestrians (VSP) to an pedestrian (eg, an acoustic vehicle alerting system or an approaching vehicle sound system (approaching). Vehicle audible systems), abbreviated as AVAS). In such embodiments, when the electric vehicle is in operation, the system can generate sound based on the characteristics of the powertrain of the electric vehicle. This system can improve pedestrian safety by notifying pedestrians of the presence of electric vehicles.

Apparatus, systems, and methods in accordance with embodiments of the present technology can include any of the above elements, or any combination of the above. The embodiments and combinations of the various elements herein are merely exemplary and are not intended to limit the scope of the disclosure.

10‧‧‧ Operator

11‧‧‧Pedestrians

12‧‧‧ Vehicles

100‧‧‧ system

101‧‧‧ processor

103‧‧‧ memory

105‧‧‧Electric motor

107‧‧‧Battery

109‧‧‧ sensor

111‧‧‧Sound memory

113‧‧‧Sound processing components

115‧‧‧Communication components

117‧‧‧Speaker

1000‧‧‧ method

1001~1007‧‧‧

1100‧‧‧ method

1101~1105‧‧‧

1 is a block diagram of a system configured in accordance with a representative embodiment of the disclosed technology.

2A and 2B are schematic diagrams showing analyzed frequency characteristics within a sampling range in accordance with a representative embodiment of the disclosed technology.

Figure 3 is a schematic illustration of frequency characteristics produced within a target range in accordance with a representative embodiment of the disclosed technology.

Figure 4 illustrates a schematic diagram of a composite waveform based on the generated frequency characteristics in accordance with a representative embodiment of the disclosed technology.

Figure 5 illustrates a schematic diagram of an adjusted composite waveform in accordance with a representative embodiment of the disclosed technology.

Figure 6 is a schematic diagram showing a segment of the adjusted composite waveform shown in Figure 5.

Fig. 7, Fig. 8, and Fig. 9 are schematic diagrams showing a method of playing the clip shown in Fig. 6.

10 and 11 illustrate a flow chart of an embodiment of the disclosed technology.

1 is a block diagram of a system 100 configured in accordance with a representative embodiment of the disclosed technology. In some embodiments, system 100 can be an electric vehicle such as an electric motor vehicle, or a system that is attached and coupled to an electric vehicle. The system 100 includes a processor 101, a memory 103 coupled to the processor 101, an electric motor 105 configured to move the system 100 (or a powertrain having an electric motor and other transmission elements/devices such as a belt, chain, gear set, etc.) A battery 107, one or more sensors 109, and a communication component 115 are provided to power the electric motor 105. Processor 101 can control other components within system 100. The memory 103 can store instructions, signals, or other information about the system 100. Battery 107 provides power to electric motor 105 such that electric motor 105 can move system 100. The sensor 109 is configured to measure and/or monitor the components and operational characteristics of the system 100. In some embodiments, the sensor 109 can include: an audio sensor, a fluid pressure sensor, a temperature sensor, a speed sensor, a position sensor, a gyroscope, a torque sensor, and the like. The communication component 115 is configured to communicate with other devices or systems (eg, a user's smart phone, a server that provides service to the system 100, a battery exchange station/kiosk, a vehicle, etc.) via one or more wireless connections. The wireless connection is, for example, a wide area network (WAN), a local area network (LAN), or a personal area network (PAN).

The system further includes a sound memory 111, a sound processing unit 113, and a speaker 117. The sound memory 111 is configured to store digital audio signals or sound information associated with the system 100. The sound processing component 113 is configured to adjust the sound associated with the system 100. The speaker 117 is configured to play a sound or audio signal associated with the system 100 to the driver/passenger of the operator 10, the pedestrian 11 and/or the vehicle 12. In some embodiments, the speaker 117 can It is set to play a sound in a particular direction, such as the direction in which system 100 is moving.

In some embodiments, the sensor 109 includes a speedometer (or GPS sensor) that detects the speed of the system 100. The measured speed is transmitted to the processor 101, and the processor 101 is programmed to retrieve a sound segment (e.g., a digital audio file) stored in the memory 103 or the sound memory 111 corresponding to the speed, and provide the sound clip. The sound processing unit 113 is adjusted to play the sound through the speaker 117. As discussed in further detail below, depending on the computing power of system 100, the synthesized vehicle sound (i.e., the sound clip) may be preloaded into sound memory 111 by analysis performed in a remote laboratory, or by the system itself. Processing equipment to calculate / decide.

To generate a sound clip/sound file (e.g., a digital audio wav file) representing the sound of system 100 over its range of operating speeds, the actual sound of the system is recorded over a range of speeds at which it can be heard. In one embodiment, the sound is recorded in a range of speeds at which the system 100 produces a distinct audible signal that can be sensed by the microphone (eg, a range of speeds of 15 to 30 kilometers per hour). In some embodiments, the sampling range can be the operating range of the electric motor 105 (eg, 1000 to 3000 revolutions per minute (rpm)).

The sound of system 100 within the sampling range is stored in digital memory and analyzed in the frequency domain to identify the dominant frequency of the electric motor and the harmonics that cause the electric motor to have its characteristic sound. The amplitude of the frequency component typically varies with the speed of the carrier. For example, as shown in Figure 2A, measured by an electric motor running at 30 kilometers per hour. The fundamental frequency is about 233 Hz, and significant octaves (overtones) are measured at 466, 932, 1864, and 3729 Hz, and 622, 739, 830, 1108, 1661, 2217, 2489, 2960. And partial harmonics are measured at 3322 Hz. In other embodiments, the sound of the electric motor can be measured at multiple sets of fundamental frequencies depending on factors such as the characteristics of the electric motor.

The frequency of the detected signal decreases as the speed or number of revolutions per minute decreases. The frequency of the detected component is plotted against the vehicle speed (or the number of revolutions per minute of the electric motor) to produce a series of curves as shown in Figures 2A and 3. Based on the identified frequency signatures, the curves are analyzed to predict the frequency components within the range that the sound produced by the system is generally inaudible in actual use (eg, on a street). For example, the range of speeds at which the system 100 operates (eg, from rest to maximum speed) may determine the target range of predicted sounds.

In some embodiments, the frequency versus speed graph is analyzed by a curve fitting method (eg, interpolation, spline interpolation, polynomial matching, etc.) to predict the speed at which the sound is inaudible during use. The frequency component of the electric motor and its harmonics and overtones. Once the curve is adapted to the entire speed range of the system 100, a sound file such as a WAVE file is created for the entire speed range. Such files can be relatively short, so that they are stored in the inexpensive memory of system 100. The synthesized WAVE file can then be used to generate the sound played by the speaker 117.

In some embodiments, the sound processing component 113 can further adjust the composition of the audio signal for customizing the user experience. Lift For example, the sound processing component 113 can fade into the audio signal group with a parabolic function and/or fade out the audio signal group with a linear function (as shown in FIG. 5).

In some embodiments, the sound file is divided into a plurality of segments. For example, each of the segments may correspond to a particular speed range (eg, 1 kilometer per hour). The segments can be generated and stored in the sound memory 111 for further use. For example, processor 101 can be programmed to play a portion of the stored segments that correspond to the current speed of movement of system 100.

In some embodiments, the stored segments can be played back in the forward or reverse direction to provide a natural sound to the user. In some embodiments, the direction in which the stored segments are played is determined by a change in the speed of movement, such as acceleration or deceleration. The details of these embodiments are discussed below with reference to Figures 7 through 9.

In some embodiments, the creation of a sound file (i.e., the sound signal segment) representing the sound of system 100 (e.g., a vehicle) is accomplished in the laboratory based on the recording of the vehicle. The sound file is then stored in the carrier during manufacture. In other embodiments, the sound file of the vehicle can be included in the software update of the existing vehicle through a wired or wireless connection (for example, via a smart phone connected to the vehicle). In still other embodiments, a sound file may be generated on the carrier depending on the processing capabilities available on the carrier (eg, the processing capabilities of processor 101 shown in FIG. 1). For example, the vehicle can include a microphone that is configured to detect sound produced by the user when instructed to drive at a particular speed. The sound is recorded, stored in memory, and analyzed by a signal processor on the vehicle to produce sound in a manner similar to that performed in the laboratory. Audio file. The resulting segment can then be stored in the sound memory 111, which can then play the segment in the manner described above. In some embodiments, the segments can be stored as a firmware of system 100.

2A and 2B are schematic diagrams showing analyzed frequency characteristics within a sampling range in accordance with a representative embodiment of the disclosed technology. In Figure 2A, three different categories of frequencies are identified in the sampling range of 15 to 30 kilometers per hour.

The most significant frequencies can be identified as the fundamental frequency and its overtones and semi-harmonics, and high frequency components can also be identified, but high frequency components are ignored in one embodiment. In the illustrated embodiment, the fundamental frequency is the most significant frequency within the sampling range (e.g., having the largest amplitude among the acoustic waves of all frequencies). As shown in Fig. 2A, the fundamental frequency is about 233 Hz at a speed of 30 km per hour.

The "overtone" category refers to the sound waves that can form the overtone of the fundamental frequency (for example, any frequency is an integer multiple of the fundamental frequency, without the fundamental frequency). In the illustrated embodiment, the overtone can range from 466 to 3729 Hz.

The "semi-harmonic" category refers to a sound wave that can form a harmonic of the fundamental frequency (for example, any frequency whose frequency is an integer multiple of the fundamental frequency, including the fundamental frequency). In the illustrated embodiment, the semi-harmonic can range from 622 to 3322 Hz.

As shown in Figure 2A, the frequency signature is plotted or analyzed as a frequency characteristic curve. The identified frequency characteristics shown in Figure 2A are used to generate frequency characteristics over a range of speeds that the vehicle typically does not hear. As such, the frequency characteristics produced within the target range may retain the primary characteristics of the original sound source (eg, electric motor 105). Thus, the resulting frequency signature can be used to simulate the sound produced by the original sound source.

Figure 3 is a schematic illustration of frequency characteristics produced within a target range in accordance with a representative embodiment of the disclosed technology. In the embodiment shown, the target range is a speed range of 0 to 30 kilometers per hour. As shown, the resulting frequency characteristic is a pattern of frequency characteristic curves. The curve shown in Figure 3 can be generated from the curve in Figure 2A by extrapolation, interpolation, curve adaptation, and/or other suitable algorithms. In some embodiments, the generated frequency characteristics can be formed based on empirical research, such as a study based on user experience. As shown, the range of curves produced in Figure 3 (for example, 0 to 30 kilometers per hour) is greater than the curve in Figure 2A (for example, 15 to 30 kilometers per hour). Thus, the curve generated in FIG. 3 can be used to produce a sound that sounds like the original sound source (eg, the sound of the powertrain incorporating the carrier of system 100) within a target range greater than the sampling range.

Once the frequency versus speed curve for the entire expected operating speed is determined, the sound file is generated. The sound file can be quite short depending on the fidelity required, the speakers you want to use, and other audio engineering factors. In one embodiment, the 1.8 second sound file is sufficient to store sound representing the speed of the electric motor vehicle at speeds ranging from 0 to 30 kilometers per hour. The sound file reproduces the frequency of different frequency components at each speed.

Figure 4 illustrates a schematic diagram of a composite waveform based on the generated frequency characteristics in accordance with a representative embodiment of the disclosed technology. The composite waveform can be generated by synthesizing or combining sound waves of a plurality of frequency categories (for example, the above-mentioned "fundamental frequency", "overtone", and "half-harmonic" categories).

In the illustrated embodiment, the composite waveform is combined with "overtone" and "half harmonic" in such a manner that the amplitude is equal to the weight (for example, each half of each category). The wave of the sound category is generated. In other embodiments, the composite waveform may be generated by combining different categories at different scales depending on a number of factors, such as providing different audio themes to the user.

Figure 5 illustrates a schematic diagram of an adjusted composite waveform in accordance with a representative embodiment of the disclosed technology. In some embodiments, the composite waveform in FIG. 4 can be further adjusted during playback. The amplitude of the envelope of the composite waveform corresponds to the volume of the speaker when the audio signal is played. In the illustrated embodiment, the composite waveform can be "fade in" at a first speed range of 0 to 14 kilometers per hour based on a parabolic function, a flat response at a speed of about 14.5 to 23.5 kilometers per hour, and a speed of 23.5 per hour. Adjust to a linear attenuation of the waveform amplitude of 30 km. For example, this produces a naturally sounding vehicle that mimics how the sound of the vehicle increases as the speed increases, and then reduces the contribution of the synthesized sound as the actual sound of the vehicle is heard. The increasing waveform provides a smooth sound to the user or bystander. In the second speed range (for example, 14.5 to 23.5 km/h), the composite waveform can be played at maximum volume. In the third speed range (eg, 23.5 to 30 kilometers per hour), as the natural sound of the vehicle increases with speed, the composite waveform can be adjusted by "fade out" based on a linear function. Thus, to provide a smooth, natural user audio experience, the technique can fade out waveforms in the third speed range. In other embodiments, the composite waveform can be adjusted by other suitable functions. The first, second, and third speed ranges may vary based on the volume of the sound produced by the carrier itself. For example, a vehicle with a quieter powertrain produces sound that is only large enough when the vehicle speed exceeds 60 kilometers per hour. To allow pedestrians to notice, the first, second, and third speed ranges can be set to 0 to 20 kilometers per hour, 20 to 40 kilometers, and 40 to 60 kilometers.

Figure 6 is a schematic diagram showing a segment of the adjusted composite waveform shown in Figure 5. The composite waveform can be divided into multiple audio signal segments. In one embodiment, the speed difference of 1 km per hour corresponds to a segment of the audio file of 60 milliseconds. As shown, the composite waveform is segmented based on the speed of movement of the system or electric vehicle (eg, one segment per speed unit). A segment corresponding to the detected vehicle speed is played through a speaker on the carrier.

Fig. 7, Fig. 8, and Fig. 9 are schematic diagrams showing a method of playing the clip shown in Fig. 6. Depending on the speed of the vehicle, the disclosed technique can play the segment normally (e.g., forward) direction/form or reverse.

In one embodiment, the speed of the vehicle is detected at a rate similar to the length of the audio file (eg, every 60 milliseconds). If the speed of the vehicle increases, the corresponding audio clip is played back. If the detected vehicle speed is reduced, the corresponding audio segment is played back. In one embodiment, the audio segment is played in the forward and reverse directions, and vice versa, in order to avoid significant audio discontinuities while the vehicle is maintaining constant speed.

In the embodiment shown in Fig. 8, when the electric vehicle is moving at a constant speed, the audio clip can be played back in the forward direction and then reversed (e.g., reversed). The process is then repeated as long as the carrier maintains the same speed. This configuration provides a smooth waveform (for example, starting from the beginning to the end of the clip as shown in Figure 7 and then starting again).

In some embodiments, when the motorized vehicle is accelerated, all segments can be played in a normal form (eg, as shown in Figure 9, the speed is The hour is increased from 24 kilometers to 26 kilometers. First, the segment corresponding to 24 kilometers per hour is played forward, then the segment corresponding to 25 kilometers per hour is played forward, and so on. In some embodiments, when the electric vehicle is decelerating, the next segment can be played in reverse (eg, as shown in Figure 9, the speed is reduced from 26 kilometers per hour to 24 kilometers, and the segment corresponding to a speed of 26 kilometers per second is played back. Then reverse playback of the segment corresponding to 25 km/h, and so on). With this configuration, the disclosed technique can play the overall waveform in a smooth and continuous manner to enhance the user experience.

10 is a flow chart of a method 1000 for generating an audio signal associated with an electric motor of an electric vehicle (eg, for simulating its sound when operating an electric motor). In some embodiments, method 1000 can be implemented in a system of the present disclosure (eg, system 100). In some embodiments, method 1000 can be implemented in an electric vehicle. In some embodiments, method 1000 can be used to configure a carrier sound system. For example, the vehicle sound system can include a processor and a sound memory/storage device coupled to the processor. In such embodiments, method 1000 can generate an audio segment based on an analysis (eg, the embodiments discussed herein with reference to Figures 1 through 2B) and store it in a sound memory. Once completed, the audio clips stored in the sound memory can be used (eg, played by the speaker of the vehicle's sound system).

As shown in FIG. 10, method 1000 first analyzes a first set of audio information about the electric motor at block 1001 to identify a plurality of frequency features of the audio information within the first range. In some embodiments, the first set of audio information can be measured by an audio sensor, such as a microphone. In some real In the mode, the frequency characteristics include sound waves at a plurality of frequencies (e.g., the embodiments discussed above with reference to Figures 2A and 2B). In some embodiments, the first range can be a sampling range (eg, a sampling range determined by vehicle speed or electric motor speed). In some embodiments, the frequency characteristic can be in the form of a frequency characteristic curve/straight line. In some embodiments, the frequency characteristics can include fundamental frequencies, overtones, and amplitudes of harmonics at different vehicle speeds. In some embodiments, the frequency characteristic can include a high frequency ranging from about 9460 to 10540 Hz, a harmonic frequency ranging from about 466 to 3729 Hz, a harmonic frequency ranging from about 622 to 3322 Hz, and a fundamental frequency of about 233 Hz. In some embodiments, the frequency characteristic can be determined based on at least one characteristic of the speaker of the electric vehicle (eg, such that the corresponding audio segment can be played well at the speaker).

At block 1003, method 1000 then generates a corresponding set of frequency features in the second range based on the plurality of frequency features identified in the first range. In some embodiments, the second range can be a range of vehicle speeds, and the second range (eg, 0 to 30 kilometers per hour) is greater than the first range (eg, 15 to 30 kilometers per hour). At block 1005, method 1000 then generates a set of audio signal segments corresponding to different vehicle speeds within the second range. In some embodiments, the audio signal segment may be the segment discussed above with reference to FIG. 6 (eg, a set of sound waves corresponding to a range of vehicle speeds). At block 1005, method 1000 then stores the set of audio signal segments in a sound memory coupled to a processor of the electric motor. The processor is configured to control or communicate with the electric motor. In some embodiments, the processor can be an engine control unit. Once the audio signal segment is stored in the sound memory, It can be played when the operator operates the electric vehicle (for example, the sound of an electric motor).

In some embodiments, method 1000 can further include (1) determining a first range to be measured; and (2) operating the electric vehicle within the first range. The first range may correspond to a first range of vehicle speeds between a first speed of the electric vehicle (eg, 15 kilometers per hour) and a second speed of the electric vehicle (eg, 30 kilometers per hour). The method 1000 can also include (1) measuring an audio signal generated by the electric motor when the electric motor is operating in the first range; and (2) identifying a plurality of frequency characteristics based on the measured audio signal. In some embodiments, the second range may correspond to a second between the third speed of the electric vehicle (eg, 0 kilometers per hour) and the second speed of the electric vehicle (eg, 30 kilometers per hour) Vehicle speed range.

In some embodiments, the method 1000 can include adjusting the corresponding set of frequency characteristics in the second range by fading into the corresponding set of frequency features in the "fade in" range or the "fade out" range. The implementation of the "fade in" and "fade out" features is discussed above with reference to the sound processing component 113 and FIG.

11 is a flow chart of a method 1100 for playing an audio signal associated with an electric vehicle (eg, to simulate the sound of a powertrain, specifically, to simulate the sound of an electric motor). In some embodiments, method 1100 can be implemented in a system of the present disclosure (eg, system 100). In some embodiments, the method 1100 can be implemented in an electric vehicle. In some embodiments, method 1100 can be used to configure a carrier sound system. For example, a vehicle sound system can include a processor and a coupled processor Sound memory/storage device. In such embodiments, method 1100 can play a pre-stored audio segment via a speaker of the vehicle sound system.

At block 1101, method 1100 first determines the speed of the electric vehicle. In some embodiments, the measurement of speed can be accomplished by a speed sensor or a speedometer. At block 1103, method 1100 then receives an audio signal segment corresponding to the determined vehicle speed from a memory (eg, a sound memory as discussed herein). The audio signal segment is generated from a plurality of sound frequency characteristics corresponding to the determined vehicle speed. In particular, the audio signal segment is generated by a plurality of sound frequency features that correspond to sounds produced by the powertrain over a range of speeds. In some embodiments, the sound frequency feature can include a plurality of segments, each of the segments can include an electric motor speed generated at a different speed range (eg, a range of speeds at which the electric vehicle can operate) at different speeds. The amplitude of multiple frequency characteristics of the sound. The generation of the audio signal segment can be referred to the embodiment described in FIGS. 1 to 4. At block 1105, method 1100 then plays an audio signal segment corresponding to the received sound frequency characteristic with the speaker of the electric vehicle.

In some embodiments, method 1100 can adjust the amplitude of the audio signal segment based on the determined motor vehicle speed. In other words, the speakers can play different audio segments at different vehicle speeds. For example, as described in the embodiment corresponding to FIG. 5, when the speed of the electric vehicle is increased from the first speed range to the second speed range and the third speed range, the speaker not only plays different speeds corresponding to different vehicle speeds. The audio clip, the volume/amplitude of the speaker is also adjusted to the maximum volume by increasing (for example, based on a parabolic function fade in), and then decreased (for example, based on a linear function fade out) and vice versa. In some implementations, method 1100 can play an audio segment in a number of ways. For example, in some implementations, method 1100 can play an audio segment in a forward/reverse direction. In some embodiments, the method 1100 can play the segment forward while the electric vehicle is accelerating. In some embodiments, the method 1100 can play the segments in reverse when the electric vehicle is decelerating. In some embodiments, when the speed of the electric vehicle is substantially constant (eg, plus or minus 10%), the method 1100 can repeat the same segment in the forward and reverse directions. The implementation of the forward/reverse playback of the audio clip is described in detail above with reference to FIGS. 7 through 9.

In some embodiments, the audio clips can be stored in a sound memory or storage device. When the system wants to play an audio clip, the system can retrieve the audio clip from the sound memory. In some embodiments, the system can fetch a plurality of audio segments (eg, some of the most frequently played) and then store them in a coupled processor or a cache located within the processor so that the audio segments can be quickly and efficiently Play.

It is to be understood that the specific embodiments of the technology described herein are for illustrative purposes only and various modifications may be made without departing from the art. In addition, although advantages associated therewith have been described in the context of particular embodiments of the technology, other embodiments may have such advantages, and not all embodiments are required to have such advantages as fall within the scope of the present technology. Inside. Accordingly, the disclosure and its related art may encompass other embodiments that are not explicitly shown or described herein.

Claims (29)

A method for playing an audio signal associated with an electric vehicle, the method comprising: determining a speed of the electric vehicle; receiving an audio signal corresponding to the determined speed of the electric vehicle from a memory And a segment, wherein the audio signal segment is generated by a plurality of sound frequency features, wherein the sound frequency features correspond to a sound generated by a powertrain; and the audio signal segment is played by a speaker of the electric vehicle. The method of claim 1, further comprising: receiving, from the memory, the sound frequency characteristics corresponding to the determined speed of the electric vehicle, wherein the sound frequency characteristics comprise a plurality of segments, wherein each of the sound frequencies The segment includes amplitudes of the plurality of frequency features in the sound generated by the powertrain over a range of speeds; and generating the audio signal segments corresponding to the received sound frequency characteristics. The method of claim 1 wherein the powertrain comprises an electric motor. The method of claim 1, further comprising: adjusting an amplitude of the audio signal segment based on the determined speed of the electric vehicle. The method of claim 4, further comprising: increasing a volume of the speaker when determining that the speed of the electric vehicle rises within a first speed range; and determining that the speed of the electric vehicle falls at a speed When the second speed range is within, the volume of the speaker is set to a maximum; and when it is determined that the speed of the electric vehicle is rising within a third speed range, the volume of the speaker is lowered. The method of claim 1, wherein the speed of the electric vehicle is a first moving speed at a first time, wherein the audio signal segment is a first audio signal segment, wherein the method further comprises: Determining a second moving speed of the one of the electric vehicles; generating a second audio signal segment based on the received sound frequency characteristics; and playing the second audio signal segment with the speaker of the electric vehicle . The method of claim 6, further comprising: playing the first audio signal segment and the second audio signal segment in a forward direction when the first moving speed is lower than the second moving speed. The method of claim 6, further comprising: playing the first audio signal segment and the second audio signal segment in reverse when the first moving speed is higher than the second moving speed. The method of claim 1, wherein the speed of the electric vehicle is a first moving speed at a first time, wherein the audio signal segment is a first audio signal segment, wherein the method further comprises: Determining a second moving speed of the one of the electric vehicles at a second time point; and playing the first audio signal segment in reverse when the second moving speed is substantially equal to the first moving speed. An electric vehicle includes: a processor; a powertrain coupled to the processor; a memory coupled to the processor and configured to store a plurality of audio signal segments, wherein each of the audio signal segments is corresponding Generating a plurality of sound frequency characteristics to the electric vehicle, wherein the sound frequency features comprise a plurality of segments corresponding to a plurality of frequency features in a sound produced by the powertrain; and a speaker, configuration To play the audio signal segments. The electric vehicle of claim 10, wherein each of the segments includes an amplitude of the frequency features in the sound generated by the powertrain over a range of speeds, wherein the processor is configured to be based on the electric vehicle A moving speed and the sound frequency characteristics are used to generate the audio signal segments. The electric vehicle of claim 10, wherein the powertrain comprises an electric motor. The electric vehicle of claim 10, wherein the powertrain comprises an electric motor, a drive belt, and a transmission gear set. The electric vehicle of claim 10, wherein the processor adjusts an amplitude of the audio signal segments played by the speaker based on a moving speed of the one of the electric vehicles. A method for playing an audio signal associated with an electric vehicle, the method comprising: receiving, from a sound memory, a plurality of sound frequency characteristics corresponding to a speed range of the electric vehicle, wherein the sound frequency characteristics include a plurality of segments, each of the segments comprising an amplitude of a plurality of frequency features in a sound generated by the powertrain over the range of speeds; determining a current speed of movement of one of the motorized vehicles; generating corresponding to the received a first audio signal segment of the sound frequency characteristic; playing the first audio signal segment with a speaker of the electric vehicle; determining that the electric vehicle is accelerating, decelerating, or maintaining the current moving speed; based on the determining, generating Corresponding to a second audio signal segment of the received sound frequency characteristics; and playing the second audio signal segment with the speaker of the electric vehicle. The method of claim 15, further comprising: playing the first audio signal segment and the second audio signal segment in a forward direction when the electric vehicle is in acceleration. The method of claim 15, further comprising: playing the first audio signal segment and the second audio signal segment in reverse when the electric vehicle is decelerating. The method of claim 15, further comprising: when the electric vehicle maintains the current moving speed, playing the first audio signal segment in reverse to replace the second audio signal segment. A method for generating an audio signal associated with an electric vehicle, the method comprising: analyzing a first audio information group associated with a powertrain of the electric vehicle to be within a first range from the first Identifying a plurality of frequency features in an audio information group; generating a set of corresponding frequency features in a second range based on the frequency features identified in the first range; generating a set of audio signal segments corresponding to the Different speeds in the second range; and storing the set of audio signal segments to a sound memory coupled to the processor of the electric vehicle. The method of claim 19, further comprising: determining the first range to be measured; operating the electric vehicle in the first range, wherein the first range corresponds to one of the electric vehicles a first carrier speed range between a speed and a second speed of the electric vehicle, wherein the first speed is lower than the second speed; measuring when the electric vehicle is operated within the first range The plurality of audio signals generated by the electric vehicle; and the frequency characteristics are identified based on the measured audio signals. The method of claim 20, wherein the second range corresponds to a second carrier speed range between a third speed of the electric vehicle and the second speed of the electric vehicle, wherein The third speed is lower than the first speed. The method of claim 21, wherein the first speed is about 15 kilometers per hour, wherein the second speed is about 30 kilometers per hour, wherein the third speed is about 0 kilometers per hour. The method of claim 19, wherein the set of audio signal segments are configured to be played by a speaker of the electric vehicle. The method of claim 19, wherein the frequency features comprise a plurality of frequency characteristic curves. The method of claim 19, wherein the frequency features comprise pitches, overtones, and harmonics corresponding to different vehicle speeds. The method of claim 19, wherein the frequency features comprise a high frequency of about 9460 Hz to 10540 Hz, an overtone frequency of about 466 Hz to 3729 Hz, a harmonic frequency of about 622 Hz to 3322 Hz, and about The fundamental frequency of 233 Hz. The method of claim 19, further comprising determining that the frequency characteristics are based at least on a characteristic of one of the speakers of the electric vehicle. The method of claim 19, further comprising: adjusting the set of corresponding frequency features in the second range by fading into the set of corresponding frequency features within a fade-in range. The method of claim 19, further comprising: adjusting the set of corresponding frequency characteristics in the second range by fading out the set of corresponding frequency characteristics within a fade out range.