CN216565265U - Distributed extensible teleconference system - Google Patents
Distributed extensible teleconference system Download PDFInfo
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- CN216565265U CN216565265U CN202122722663.2U CN202122722663U CN216565265U CN 216565265 U CN216565265 U CN 216565265U CN 202122722663 U CN202122722663 U CN 202122722663U CN 216565265 U CN216565265 U CN 216565265U
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Abstract
The utility model discloses a distributed expandable teleconference system, which comprises at least one master audio control unit, at least one slave audio expansion unit and an A2B bus circuit unit for signal transmission between the master audio control unit and the slave audio expansion unit; the main audio control unit comprises a processor chip module, an A2B bus chip module and an audio device module; the slave audio extension unit comprises an A2B bus chip module, a voice signal processing module and an audio equipment module; the A2B bus circuit unit includes an A2B bus circuit. Compared with the existing teleconference equipment, the distributed extensible teleconference system formed by the master audio control unit, the slave audio extension unit and the A2B bus circuit unit can extend the audio pickup equipment in a distributed multi-endpoint manner without being interfered and influenced by distance and environment, has low multi-endpoint transmission and processing delay and has high reliability and accuracy.
Description
Technical Field
The utility model relates to a teleconference system, in particular to a distributed extensible teleconference system.
Background
With the advancement of globalization, the cross-regional business volume continues to increase, and with the more and more popular cross-regional and cross-department communication and collaboration scenes, people have more and more demands on teleconferencing involving multiple parties, so that a multiparty teleconference takes place. Compared with the traditional conference, the teleconference has the characteristics of simple and convenient installation, low cost, no region limitation and the like.
In a teleconference system, when a plurality of participants participate in a conference site, a call device is usually required, which has a sound pickup range covering a certain range to meet the requirement of picking up voices of a plurality of persons at different positions. In the case of a large space at a meeting place and a large number of participants, it is difficult for one communication device to meet the above requirements, and therefore, in order to enlarge the sound pickup range of the communication device, it is usually implemented by connecting or extending the communication device, such as connecting an extension microphone.
Conference telephone equipment in the market at present is used for connecting an audio line with an RJ9 interface to form a cascade microphone, the connecting line is short and generally not more than 2.5m, an analog signal received by the microphone is easily interfered by an external environment in a transmission process, especially, the tone quality of a speaker is seriously influenced under the condition that the connecting line is long or the received analog signal is weak, and the conference communication experience is poor;
in addition, as the interconnection between telephone equipments is performed through RJ45 interface, the voice telephone has very high requirement for end-to-end transmission delay, the local conference room needs to perform digital signal processing such as echo cancellation, digital noise reduction and voice enhancement on different telephone equipment nodes, and to perform processing such as voice synchronization and mixed voice synthesis on a plurality of different telephone equipment nodes, which further increases the delay through network interface communication mode, and makes voice synchronization and synthesis difficult, thereby affecting the quality and experience of the call. Therefore, the current cascading expansion technical scheme is easily limited by factors such as distance, environmental interference, call processing delay, difficulty in synchronous audio synthesis and the like in use, communication quality of the teleconference is affected, user experience is poor, and further improvement is needed.
A2B (Automotive Audio Bus) is a digital networking technology from adi (analog devices) to provide high fidelity Audio for automobiles. The A2B can realize the automobile digital audio bus technology with the theoretical maximum 50Mbps bandwidth and the bidirectional transmission of up to 32 channels, and has the advantages of excellent performance, remarkable circuit simplification and simpler software design. The A2B bus is typically connected to multiple remote sensors for different applications in a daisy chain sequence, greatly reducing redundant cabling while still providing power to other devices in the daisy chain, thereby eliminating the need for a local power supply and further reducing the overall cost of the system. The A2B bus technology is not only used in the automotive digital audio field, but is also commonly used in other industrial fields.
In order to get rid of the above limitations and improve the communication quality, it is very urgent to develop an expandable teleconference device that meets the demand.
Therefore, the existing teleconference system has the problems that equipment cascade expansion is interfered by distance and environment, and the call processing delay and audio synthesis are difficult to synchronously process.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a distributed and extensible teleconference system. The utility model has the advantages that the cascade expansion is not interfered by distance and environment, and the call processing time delay and the audio synthesis are convenient for synchronous processing.
The technical scheme of the utility model is as follows: a distributed and expandable teleconference system comprises at least one master audio control unit, at least one slave audio expansion unit and an A2B bus circuit unit for signal transmission between the master audio control unit and the slave audio expansion unit;
the main audio control unit comprises a processor chip module, an A2B bus chip module and an audio device module;
the slave audio extension unit comprises an A2B bus chip module, a voice signal processing module and an audio equipment module;
the A2B bus circuit unit includes an A2B bus circuit.
In the foregoing distributed and expandable teleconference system, the master audio control unit is connected to the A2B bus circuit unit through an A2B bus chip module; the processor chip module is respectively connected with the A2B bus chip module and the audio equipment module by physical circuits;
the slave audio extension unit is connected with the A2B bus circuit unit through an A2B bus chip module; the voice signal processing module is respectively connected with the A2B bus chip module and the audio equipment module by physical circuits.
In the foregoing distributed and scalable teleconference system, the A2B bus circuit is used for signal transmission between the master audio control unit and the slave audio extension unit, including transmission of voice signals between the master audio control unit and the slave audio extension unit, and transmission for the master audio control unit to supply operating power to the slave audio extension unit.
In the foregoing distributed and expandable teleconference system, the audio device modules in the master audio control unit and the slave audio expansion unit each include at least one voice acquisition device for acquiring an audio signal and/or at least one audio playback device for playing back a voice.
In the foregoing distributed and expandable teleconference system, the voice acquiring device includes a microphone module, where the microphone module is a microphone device or an array device including a plurality of microphones;
the audio playing device comprises a loudspeaker module, and the loudspeaker module is a loudspeaker device or a sound device comprising a plurality of loudspeakers.
In the foregoing distributed and scalable teleconference system, the microphone module at least includes an electret condenser microphone, a mems analog and/or digital microphone;
the loudspeaker module at least comprises a single loudspeaker, a double loudspeaker comprising high pitch and low pitch and/or a triple loudspeaker comprising high pitch, middle pitch and low pitch, and can output audio signals of different frequency bands, so that the loudspeaker module is rich in more vivid auditory effect.
In the foregoing distributed and scalable teleconference system, the microphone module preferably supports a digital microphone chip, and the digital microphone chip is composed of a buffer stage, an amplification stage, a low-pass filter, and an anti-analog-to-digital conversion; the buffer stage completes impedance conversion, the amplification stage amplifies signals, the low-pass filter filters high-frequency signals to prevent aliasing during analog-to-digital conversion, and the anti-analog-to-digital conversion converts the amplified analog signals into Pulse Density Modulation (PDM) signals.
In the distributed extensible teleconference system, the processor chip module is used for driving the audio playing device to play audio and controlling the voice acquisition device to acquire audio signals; the processor chip module comprises a signal analysis functional module and a synthesis processing functional module which are used for carrying out signal analysis and synthesis processing on the collected audio signals.
In the distributed and expandable teleconference system, the processor chip module performs voice signal analysis and synthesis processing on the audio signal acquired by the voice acquisition device of the main audio control unit and the audio signal uploaded from the A2B bus circuit unit and transmitted from the audio expansion unit to other participants through a device peripheral interface such as a network, thereby completing the voice processing of the cascade microphone.
In the distributed and expandable teleconference system, the processor chip module can drive the A2B bus chip module to download the voice signals transmitted from the audio expansion unit from the A2B bus circuit unit.
In the foregoing distributed and extensible teleconference system, the voice signal processing module includes a voice signal acquiring and converting module for acquiring and converting an audio signal; the input interface of the voice signal processing module is connected with the output interface of the voice acquisition equipment, and the output interface of the voice signal processing module is connected with the A2B bus chip module;
the voice signal collecting and converting module can convert a received PDM signal or an analog microphone signal into a digital signal, where the digital signal includes Time-Division Multiplexing (TDM), PCM, I2S, and the like;
the voice signal acquisition and conversion module is connected with the microphone module and the A2B bus chip module and serves as an intermediate bridge of each other;
the A2B bus chip module obtains the TDM, PCM, I2S digital signals output by the voice signal collecting and converting module, and sends the digital signals to the A2B bus circuit unit through modulation processing, which is the uploading process of the voice signals.
In the distributed and expandable teleconference system, the voice signal processing module can further obtain the voice signal sent from the main audio control unit through the A2B bus circuit unit through the A2B bus chip module, the TDM digital signal is converted into a corresponding analog voice signal through an ADC (analog to digital converter), and the audio signal is played through the audio playing device.
In the distributed scalable teleconferencing system described above, the A2B bus circuit includes an A2B bus, and the A2B bus is a high bandwidth, bidirectional, digital audio differential twisted pair; the 2 differential lines realize long-distance transmission of audio data, and both the audio data and the power supply are transmitted through a pair of unshielded twisted pair lines.
In the foregoing distributed and extensible teleconference system, the voice signal processing module of the slave audio extension unit also has a signal analysis function module and a synthesis processing function module; the signal analysis function module and the synthesis processing function module of the master audio control unit and the slave audio extension unit comprise digital audio signal processing such as voice synthesis, echo cancellation, digital noise reduction, voice enhancement and the like;
the signal analysis functional module and the synthesis processing functional module can also collect voice signals of the loudspeaker module and use the collected voice signals of the loudspeaker module as signal compensation for further echo cancellation and voice enhancement, so that the processed voice effect is purer, free of noise and clearer.
In the foregoing distributed and expandable teleconference system, the processor chip module at least includes a processor chip, an internal bus, a system bus, and a memory;
the processor chip module comprises processor chips of instruction sets of different micro-processing architectures such as X86, ARM, MIPS and the like, and chip modules such as DSP, FPGA or micro MCU and the like.
In the foregoing distributed and expandable teleconference system, the voice signal processing module adopts chip modules such as TAS5805 or ES 7210.
In the foregoing distributed and expandable teleconference system, the main audio control unit further includes a power module for providing a working power, and the power module is connected to the processor chip module and the audio device module.
Compared with the prior art, the distributed extensible teleconference system composed of the master audio control unit, the slave audio extension unit and the A2B bus circuit unit can extend the audio pickup equipment in a distributed mode at multiple endpoints without being interfered and influenced by distance and environment, has low transmission and processing delay of the multiple endpoints and has high reliability and accuracy;
the A2B bus does not need an expensive microcontroller and an external memory, and the same unshielded twisted pair cable for transmitting data supplies power for the remote node, so that a local power supply does not need to be used on each bus-powered slave node, thereby greatly saving the cost and being capable of being popularized in large batch;
but many speakers of cascade connection can enjoy digital high-fidelity surround sound effect, from the small-scale meeting to the large-scale meeting, can expand according to the demand and build cascade equipment, and user's physical examination is better.
Therefore, the utility model has the advantages that the cascade expansion is not interfered by distance and environment, and the call processing time delay and the audio synthesis are convenient for synchronous processing.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic view of example 2 of the present invention;
fig. 3 is a schematic diagram of embodiment 3 of the present invention.
Detailed Description
The utility model is further illustrated by the following figures and examples, which are not to be construed as limiting the utility model.
Example 1. A distributed expandable telephone conference system is composed as shown in figure 1, and comprises at least one master audio control unit, at least one slave audio expansion unit and an A2B bus circuit unit for signal transmission between the master audio control unit and the slave audio expansion unit;
the main audio control unit comprises a processor chip module, an A2B bus chip module and an audio device module;
the slave audio extension unit comprises an A2B bus chip module, a voice signal processing module and an audio equipment module;
the A2B bus circuit unit includes an A2B bus circuit.
The main audio control unit is connected with the A2B bus circuit unit through an A2B bus chip module; the processor chip module is respectively connected with the A2B bus chip module and the audio equipment module by physical circuits;
the slave audio extension unit is connected with the A2B bus circuit unit through an A2B bus chip module; the voice signal processing module is respectively connected with the A2B bus chip module and the audio equipment module by physical circuits.
The A2B bus circuit is used for signal transmission between the master audio control unit and the slave audio extension unit, including the transmission of voice signals between the master audio control unit and the slave audio extension unit, and the transmission for the master audio control unit to provide working power supply for the slave audio extension unit.
The audio equipment modules in the master audio control unit and the slave audio expansion unit respectively comprise at least one voice acquisition equipment for acquiring audio signals and/or at least one audio playing equipment for playing voice.
The voice acquisition device comprises a microphone module, wherein the microphone module is a microphone device or an array device comprising a plurality of microphones;
the audio playing device comprises a loudspeaker module, and the loudspeaker module is a loudspeaker device or a sound device comprising a plurality of loudspeakers.
The microphone module at least comprises an electret capacitor microphone, a micro-electro-mechanical system analog and/or digital microphone;
the loudspeaker module at least comprises a single loudspeaker, a double loudspeaker comprising high pitch and low pitch and/or a triple loudspeaker comprising high pitch, middle pitch and low pitch, and can output audio signals of different frequency bands, so that the loudspeaker module is rich in more vivid auditory effect.
The microphone module preferably supports a digital microphone chip, and the digital microphone chip is composed of a buffer stage, an amplification stage, a low-pass filter and an anti-analog-to-digital conversion; the buffer stage completes impedance conversion, the amplification stage amplifies signals, the low-pass filter filters high-frequency signals to prevent aliasing during analog-to-digital conversion, and the anti-analog-to-digital conversion converts the amplified analog signals into PDM signals.
The processor chip module is used for driving the audio playing equipment to play audio and controlling the voice acquisition equipment to acquire audio signals; the processor chip module comprises a signal analysis functional module and a synthesis processing functional module which are used for carrying out signal analysis and synthesis processing on the collected audio signals.
The processor chip module analyzes and synthesizes the audio signals collected by the voice collecting device of the main audio control unit and the audio signals uploaded from the A2B bus circuit unit and transmitted from the audio expansion unit, and then transmits the audio signals to other participants through peripheral interfaces of the devices such as a network, thereby completing the voice processing of the cascade microphone.
The processor chip module can drive the A2B bus chip module to download the voice signals transmitted from the audio extension unit from the A2B bus circuit unit.
The voice signal processing module comprises a voice signal acquisition and conversion module for acquiring and converting and processing audio signals; the input interface of the voice signal processing module is connected with the output interface of the voice acquisition equipment, and the output interface of the voice signal processing module is connected with the A2B bus chip module;
the voice signal acquisition and conversion module can convert the received PDM signal or analog microphone signal into a digital signal, wherein the digital signal comprises TDM, PCM, I2S and the like which are time division multiplexed;
the voice signal acquisition and conversion module is connected with the microphone module and the A2B bus chip module and serves as an intermediate bridge of each other;
the A2B bus chip module obtains the TDM digital signal output by the voice signal collecting and converting module, and the TDM digital signal is sent to the A2B bus circuit unit through modulation processing, namely the uploading process of the voice signal.
The voice signal processing module can also acquire a voice signal issued by the A2B bus circuit unit from the main audio control unit through the A2B bus chip module, the TDM digital signal is converted into a corresponding analog voice signal through the ADC, and the audio signal is played through the audio playing device.
The A2B bus circuit includes an A2B bus, the A2B bus being a high bandwidth, bi-directional, digital audio bus; 2 differential lines realize long-distance transmission of audio data, and the audio data and the power supply are transmitted through a pair of unshielded twisted pair lines;
the master audio control unit may be cascaded with at least one or more slave audio extension units, and each device may simultaneously download and upload audio data via the A2B bus.
The signal analysis function module and the synthesis processing function module of the master audio control unit and the slave audio extension unit comprise digital audio signal processing such as voice synthesis, echo cancellation, digital noise reduction, voice enhancement and the like;
the signal analysis function module and the synthesis processing function module can also collect voice signals of the loudspeaker module, and the collected voice signals of the loudspeaker module are used as signal compensation for further echo cancellation and voice enhancement, so that the processed voice effect is purer, free of noise and clearer.
The processor chip module at least comprises a processor chip, an internal bus, a system bus and a memory;
the processor chip module comprises processor chips of instruction sets of different micro-processing architectures such as X86, ARM, MIPS and the like, and chip modules such as DSP, FPGA or micro MCU and the like.
The voice signal processing module adopts chip modules such as TAS5805 or ES 7210.
The main audio control unit further comprises a power supply module for providing a working power supply, and the power supply module is connected with the processor chip module and the audio equipment module.
The A2B Bus can transmit I2S (Inter-IC Sound Bus, I2S)/TDM/PDM data, I2C (Inter-Integrated Circuit, I2C) control information, a clock and a power supply, a single 2-wire UTP cable (A2B wire) is used, the distance between nodes can reach 15 meters, the daisy chain formed by the whole master node and the slave node is covered by the distance which can reach 40 meters, and the space layout requirement of a large-scale conference can be met.
The A2B bus technology of the present application can provide network control and multi-channel bi-directional high quality digital audio, can be used as its own network with embedded subnets, or as an endpoint transport bus used in conjunction with other long distance protocols; the clocks are synchronized on all nodes in a single A2B network; each node in the system receives both microphone and serial audio data.
The A2B bus technique of the present application may ensure that audio data is sampled and transmitted simultaneously for each frame on all nodes; the frame structure is fully managed at the master node to program the use of available data timing in both directions by each transceiver, whether to distribute, extract or read data and pass it to the next node in the line topology; delays due to bus collisions or reassembly and packet data are eliminated; the A2B bus of the present application has deterministic and very low latency below 50 mus.
The power supply mode at least comprises a slave audio extension unit independent power supply mode, and further comprises a power supply module in a master audio control unit which supplies power to a processor chip module and an audio equipment module in the master audio control unit, and a processor chip bus (the UTP twisted pair of the A2B bus can support power supply, signals and power are transmitted through 2 UTP lines) is supported to supply power to all slave nodes in the system, a positive differential line is connected with the positive electrode of the power supply, and a negative differential line is used as the negative electrode of a serial slave node to form a current return path.
The A2B bus of the present application does not require expensive microcontrollers and external memory; the audio processing module can supply power to the remote node through the same Unshielded Twisted Pair (UTP) cable used for transmitting data, so that a local power supply is not required to be used on each bus-powered slave node, and the bill of materials cost of the whole system is reduced.
The method and the device can support the total expansion of the endpoints of 2-8 secondary audio expansion units in cascade connection, and if the microphone module adopts a 4-microphone array, the system equipment can support the pickup of 36 microphones at most.
The mode that this application adopted a plurality of main audio frequency control unit to cascade, each main audio frequency control unit includes a speaker module, installs in the different corners of meeting room, can play the audio signal of output multichannel like this, for example 3+1 sound channel, or 5+1 sound channel, can enjoy the sense of hearing that has the dolby surround sound system of digit high fidelity like this.
The method supports a cascade expansion mode of a plurality of main audio control units so as to further improve the overall computing capacity of the system and the expansion support of a multi-loudspeaker module; in this case, a certain master audio control unit needs to be selected as a master control chip, the rest are slave chips, and only one master control chip is provided at the same time.
Example 2. A distributed extensible teleconference system is shown in figure 2, a conference room with a long strip conference table is wide by 5 meters and long by 6 meters, 3 slave audio extension units are extended by a master audio control unit, a microphone array with 4 microphones is adopted by the master audio control unit and the slave audio extension units, and 2 loudspeakers are adopted by a loudspeaker module of the master audio control unit.
Example 3. A distributed extensible teleconference system is shown in figure 3, a conference room with an oval conference table is wide by 5 meters and long by 6 meters, 3 slave audio extension units are extended by a master audio control unit, the master audio control unit adopts a 4-microphone array and the slave audio extension units adopt 2-microphone arrays, a loudspeaker module of the master audio control unit adopts 2 loudspeakers, and the slave audio extension units are provided with 2 loudspeaker devices.
Claims (9)
1. A distributed and extensible teleconferencing system, characterized in that: comprises at least one master audio control unit, at least one slave audio extension unit and an A2B bus circuit unit for signal transmission between the master audio control unit and the slave audio extension unit;
the main audio control unit comprises a processor chip module, an A2B bus chip module and an audio device module;
the slave audio extension unit comprises an A2B bus chip module, a voice signal processing module and an audio equipment module;
the A2B bus circuit unit includes an A2B bus circuit.
2. The distributed and scalable teleconferencing system of claim 1, wherein:
the main audio control unit is connected with the A2B bus circuit unit through an A2B bus chip module; the processor chip module is respectively connected with the A2B bus chip module and the audio equipment module by physical circuits;
the slave audio extension unit is connected with the A2B bus circuit unit through an A2B bus chip module; the voice signal processing module is respectively connected with the A2B bus chip module and the audio equipment module by physical circuits.
3. A distributed and scalable teleconferencing system as claimed in claim 2, wherein: the audio equipment modules in the master audio control unit and the slave audio expansion unit respectively comprise at least one voice acquisition equipment for acquiring audio signals and/or at least one audio playing equipment for playing voice.
4. A distributed and scalable teleconferencing system as claimed in claim 3, wherein: the voice acquisition device comprises a microphone module, wherein the microphone module is a microphone device or an array device comprising a plurality of microphones;
the audio playing device comprises a loudspeaker module, and the loudspeaker module is a loudspeaker device or a sound device comprising a plurality of loudspeakers.
5. The distributed and scalable teleconferencing system of claim 4, wherein: the microphone module at least comprises an electret capacitor microphone, a micro-electro-mechanical system analog and/or digital microphone;
the speaker module includes at least a single horn, a dual horn, and/or a triple horn.
6. A distributed and scalable teleconferencing system as claimed in claim 3, wherein: the processor chip module is used for driving the audio playing equipment to play audio and controlling the voice acquisition equipment to acquire audio signals; the processor chip module comprises a signal analysis functional module and a synthesis processing functional module which are used for carrying out signal analysis and synthesis processing on the collected audio signals.
7. The distributed and scalable teleconferencing system of claim 6, wherein: the voice signal processing module comprises a voice signal acquisition and conversion module for acquiring and converting and processing audio signals; the input interface of the voice signal processing module is connected with the output interface of the voice acquisition equipment, and the output interface of the voice signal processing module is connected with the A2B bus chip module;
the A2B bus chip module is used for acquiring the digital signal output by the voice signal acquisition and conversion module and modulating and processing the digital signal and sending the digital signal to the A2B bus circuit unit.
8. The distributed and scalable teleconferencing system of claim 1, wherein: the processor chip module includes at least a processor chip, an internal bus, a system bus, and a memory.
9. The distributed and scalable teleconferencing system of claim 1, wherein: the main audio control unit further comprises a power supply module for providing a working power supply, and the power supply module is connected with the processor chip module and the audio equipment module.
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