JPH1117472A - Sound device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make microphone sound or the like easy to listen by lowering the level of music or the like when the microphone sound or the like is inputted in a device for mixing the first sound signals S1 of the music or the like and the second sound signals S2 of the microphone sound or the like and amplifying them from a speaker. SOLUTION: This sound device is composed of a first sound signal input terminal 1 for inputting sound signals S1, a second sound signal input terminal 2 for inputting the sound signals S2, sound signal processing means (4, 5, 9 and 10) for performing a required signal processing and the speaker 11. In this case, it is provided with sound level attenuation circuits (R1 and R2) for lowering the level of the sound signals S1 to a prescribed level, a switching circuit 3 for inputting the sound signals S1 to a terminal (a), inputting the sound signals attenuated by the sound level attenuation circuits to the terminal (b) and switching them, a detection part 6 for detecting that the sound signals S2 are inputted to the second sound signal input terminal and a control part 7 for switching the switching circuit from a terminal (a) side to a terminal (b) side when the second sound signals are detected by the detection part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio apparatus, and more particularly, to an apparatus for mixing a first audio signal such as music and a second audio signal such as a microphone audio and loudspeaking from a speaker. The present invention relates to an audio device that lowers the level of a first audio signal such as music when a second audio signal such as a microphone audio is input, and makes it easier to hear the second audio signal such as a microphone audio.

[0002]

2. Description of the Related Art A mixing device for playing music or the like from a speaker at normal times, mixing a microphone sound with the music at the time of guidance or calling a person, and transmitting the sound to a visitor from a speaker is used in an exhibition hall or a store. It is used in various places. At the time of this mixing, consideration must be given to making it easier for visitors and the like to hear the microphone sound, but in the past, generally, the volume of background sound such as music was reduced by human operation. That is, when using the microphone, the person has performed an operation of reducing the volume of the background sound such as music. Therefore, if a person neglects this operation, the microphone sound becomes difficult to hear, and accurate information transmission may not be performed.

[0003]

As described above, when a microphone sound is played by a mixing device, it is usually necessary for a person to reduce the volume of background sound such as music. Accordingly, when the microphone is used, if the volume of the background sound can be automatically reduced, it is not necessary for the user to operate each time, which is convenient. The present invention has been made in view of such a background, and provides an audio device in which the background sound is automatically reduced to a certain level or less when a microphone is used, or the background sound is stopped while the microphone is used. The purpose is to:

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a first method for music and the like.
A first audio signal input end to which a second audio signal such as microphone audio is input, a volume setting for the input audio signal,
In an audio apparatus including audio signal processing means for performing required signal processing such as mixing and amplification, and a speaker driven by the audio signal from the audio signal processing means, the level of the first audio signal is set to a predetermined level. Audio level attenuating means for lowering the first audio signal at one end;
The other end receives a sound signal attenuated by the sound level attenuating means, and a switching circuit for sending one of the signals to the sound signal processing means; and a second sound signal is input to the second sound signal input terminal. A detecting unit for detecting that the input is performed, and setting the switching circuit to the one end side while the input of the second audio signal is not detected by the detecting unit. The input of the second audio signal is performed by the detecting unit. And a control unit for switching the switching circuit to the other end when it is detected.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When there is no input of a second audio signal such as a microphone audio, a first audio signal such as music is sent to an audio processing means via a switching circuit without being attenuated. After necessary processing such as setting and amplification, the data is supplied to the speaker. Here, when the second audio signal such as the microphone audio is input, the detecting unit detects that the input is performed. Based on the detection, the control unit switches the switching circuit to a side from which the attenuated first audio signal is extracted. As a result, the volume of the first audio signal such as music is reduced to a predetermined level. When the input of the second audio signal such as the microphone audio is lost, and thus the detection by the detection unit is lost, the control unit returns the switching circuit to the first audio signal which is not attenuated.

As another method based on the above, the level of the second audio signal detected by the detection unit is compared with the reference level in the comparison unit, and when the level of the second audio signal exceeds the reference level. The control unit switches the switching circuit to the attenuated signal side. The switching circuit does not switch within a range not exceeding the reference level. Further, as another method, when there is a detection by the detection unit, or when the detected level exceeds the reference level, the control unit turns off the switch circuit,
The input of the first audio signal is stopped. When the detection by the detection unit is stopped or when the detection level becomes lower than the reference level, the control unit returns the switch circuit to the original ON state. As a result, the first audio signal such as music is not emitted from the speaker while the microphone audio or the like having a predetermined level or more is being input.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an audio apparatus according to the present invention. FIG. 1 is a main part block diagram showing one embodiment of a voice device according to the present invention, and FIGS. 2 to 4 are main part block diagrams showing another embodiment. 1 to 4,
The embodiment shown in FIGS. 1 and 2 is for narrowing the background sound such as music to a predetermined level or less at the time of inputting microphone sound or the like, and the embodiment shown in FIGS. The input of the background sound such as is turned off (stopped). In the drawings, common components (functional blocks) are denoted by the same reference numerals. Hereinafter, regarding the operation of the present invention,
The description will be made separately for each figure.

(1) Description of the embodiment of FIG. 1 A first audio signal S1 such as music is input to a first audio input terminal 1 and branched, and one of the two ends is one end of a switching circuit 3 (hereinafter referred to as a end). And the other input to one end of the resistor R1. The resistors R1 and R2 in the series circuit form an audio level attenuating circuit and divide the voltage at a ratio of R1 and R2 (for example, 1/2, 1/3, etc.). The divided signal is input to the other end of the switching circuit 3 (hereinafter, b end). The switching circuit 3 is switched under the control of the control unit 7, but is set to the end a when there is no input of the second audio signal S2 such as microphone audio. The output signal of the switching circuit 3 is sent to the volume control unit 4, where the volume is set. The above volume is the volume setting signal S3
Is set via the control unit 7 and the D / A conversion unit 8 based on. The signal output from the volume controller 4 is input to the mixer 9.

On the other hand, a second audio signal S2 such as a microphone audio is input to the second audio input terminal 2 and branched, one of which is input to the volume control unit 5, and the other is input to the detection unit 6. The volume control unit 5 is set via the control unit 7 and the D / A conversion unit 8 based on the volume setting signal S3, similarly to the volume control unit 4 described above. The signal output from the volume controller 5 is input to the mixer 9 and mixed with the signal from the volume controller 4. Here, the second
Is detected, the detection unit 6 detects the signal input. As a detection method, for example, an input signal is integrated by an integration circuit to be DC, and the DC signal is detected based on the presence or absence of the DC component. This detection signal is sent to the control unit 7. The control section 7 switches the switching circuit 3 to the end b when this detection signal is sent. Thereby, the volume adjustment unit 4
The level of the signal input to the mixer 9 is attenuated, and therefore, the signal output to the mixer 9 is of an attenuated level.

The output signal of the mixer 9 is amplified by the output unit 10 and drives the speaker 11. From the above, the volume level emitted from the speaker 11 is small for the first audio signal,
Becomes large, and the second audio signal S2 such as microphone sound becomes easy to hear. Second such as microphone sound
When the input of the audio signal S2 is stopped, the detection by the detection unit 6 is stopped. In this case, the control unit 7 switches the switching circuit 3 to b
Switch from the end side to the original a end side. Therefore, the detection unit 6
Is provided with a timer function, and when the second audio signal S2 is not detected for a certain period of time or more, switching to the end a is made. As a result, the volume of the first audio signal S1 such as music returns to a state where it is not attenuated.

(2) Description of the embodiment of FIG. 2 In the embodiment of FIG. 1, when the input of the second audio signal S2 such as a microphone audio is detected, the first audio or the like of music or the like is detected regardless of the level of the input level. The volume of the audio signal S1 is reduced. On the other hand, in the embodiment shown in FIG. 2, the switching circuit 3 is switched when the input level of the second audio signal S2 such as a microphone audio is higher than a predetermined level. Therefore, the detection unit 21 detects the input level based on the component converted to DC by the above-described integration circuit. Further, a comparison unit 23 is provided under the control unit 22, and the input level detected by the detection unit 21 is compared with a predetermined reference level 24.If the input level exceeds the reference level 24, the control unit 22 The switching circuit 3 is switched to the end b.

The reason for providing the reference level 24 is as follows. For example, when the second audio signal S2 is an audio signal via a microphone, there is a possibility that other noise components will be collected when the microphone is not used for the original analytics. In this case, the detection unit 21 detects a noise component as an input signal, which may cause an erroneous operation of switching the switching circuit 3 to the end b. Therefore, the above-described reference level 24 is provided. The operation is not performed to prevent a malfunction due to a noise component. The other operations are the same as those in FIG.

(3) Description of the embodiment of FIG. 3 FIG. 3 is a simplified version of the embodiment of FIG. 2, wherein the detection unit 21 determines that the input level of the second audio signal S2 such as microphone audio is the reference level. The input of the first audio signal S1 of music or the like is stopped when the first audio signal S1 is detected as exceeding the threshold. Therefore, a switch circuit 31 is provided in the line of the first audio signal S1 as shown in the figure, and when the input level of the second audio signal S2 exceeds the reference level, the control unit 32 turns off the switch circuit 31. As a result, only the second audio signal such as microphone sound is emitted from the speaker 11, and it is not difficult to hear the first audio signal S1 such as music due to the mixing. However, in the case of the present embodiment, the mixer 9 does not perform the original mixing operation. The other operations are the same as those in FIG. 2 and will not be described. Although not shown, this embodiment can be applied to the embodiment shown in FIG. That is,
The attenuating circuits (R1, R2) and the switching circuit 3 in FIG. 1 are deleted and replaced with a switching circuit 31 as shown in FIG.
Turns off the switch circuit 31 when the switch detects the input of the second audio signal S2. Thereby, the same effect as described above is obtained. In this case also, other operations are described in FIG.
Therefore, the description is omitted.

(4) Description of the embodiment of FIG. 4 FIG. 4 is a modification of FIG.
Is provided at the input point of the mixer 9, and when the detection by the detection unit 21 is performed, the control unit 42 turns off the switch circuit 41.
As a result, only the second audio signal such as microphone audio is emitted from the speaker 11. Although not shown, this embodiment can be applied to the embodiment shown in FIG. That is,
The attenuating circuits (R1, R2) and the switching circuit 3 in FIG. 1 are deleted and replaced with a switching circuit 41 as shown in FIG.
Turns off the switch circuit 41 when detects the input of the second audio signal S2.

[0015]

As described above, according to the present invention, in a device which mixes a first audio signal such as music and a second audio signal such as a microphone audio and loudspeakers from a speaker, a microphone audio and the like are provided. Automatically lowers the level of the first audio signal such as music when the second audio signal is input,
Alternatively, the input of the first audio signal is automatically stopped. This makes it easier to hear the second audio signal such as the microphone audio. Conventionally, when a microphone is used, generally, the volume of the first audio signal such as music is reduced by a person each time. However, according to the present invention, the operation becomes unnecessary. Therefore, the present invention improves the function of a sound device that mixes and loudspeaks from a speaker.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing an embodiment of a voice device according to the present invention.

FIG. 2 is a main block diagram showing another embodiment of the audio device according to the present invention.

FIG. 3 is a main part block diagram showing another embodiment of the audio device according to the present invention.

FIG. 4 is a main part block diagram showing another embodiment of the audio device according to the present invention.

[Explanation of symbols]

 S1 first audio signal S2 second audio signal S3 volume setting signal 1 first audio signal input terminal 2 second audio signal input terminal 3 switching circuit 4,5 volume adjustment unit 6,21 detection unit 7,22, 32, 42 control unit 8 D / A conversion unit 9 mixer 10 output unit 11 speaker R1, R2 resistor 23 comparison unit 24 reference level 31, 41 switch circuit

Claims (5)

[Claims] A first audio signal input terminal to which a first audio signal such as music is input; a second audio signal input terminal to which a second audio signal such as microphone audio is input; An audio signal processing unit configured to perform required signal processing such as volume setting, mixing, amplification, and the like on the input audio signal, and a speaker driven by an audio signal from the audio signal processing unit; Audio level attenuating means for lowering the level of an audio signal to a predetermined level; one end receiving the first audio signal, and the other end receiving an audio signal attenuated by the audio level attenuating means; A switching circuit for sending a second audio signal to the audio signal processing means, a detection unit for detecting that a second audio signal has been input to the second audio signal input terminal, and an input of a second audio signal by the detection unit. Is detected And a control unit for setting the switching circuit to the one end side, and for switching the switching circuit to the other end side when the input of the second audio signal is detected by the detection unit. Characteristic audio device. 2. A comparison in which an input level of a second audio signal is detected by the detection unit, and a reference level set in advance and an input level of the second audio signal detected by the detection unit are compared. A unit provided below the control unit, wherein the control unit switches the switching circuit from the one end to the other end when the input level of the second audio signal exceeds the reference level in the comparison in the comparison unit The audio device according to claim 1, wherein: 3. The audio device according to claim 1, wherein the audio level attenuation unit is configured by connecting two resistors in series and dividing the voltage at a predetermined ratio. 4. A first audio signal input terminal for receiving a first audio signal such as music, a second audio signal input terminal for receiving a second audio signal such as microphone sound, and the input device. An audio signal processing unit configured to perform required signal processing such as volume setting, mixing, amplification, and the like on the input audio signal, and a speaker driven by an audio signal from the audio signal processing unit; A switch circuit that is provided between an audio signal input terminal and the audio signal processing means and that switches on and off, and a detection unit that detects that a second audio signal has been input to the second audio signal input terminal When,
The switch circuit is set to an on state while the input of the second audio signal is not detected by the detection unit, and the switch circuit is set to an off state when the input of the second audio signal is detected by the detection unit. An audio device comprising a control unit. 5. A comparison in which an input level of a second audio signal is detected by the detection unit, and a preset reference level is compared with an input level of the second audio signal detected by the detection unit. A unit provided below the control unit, such that the control unit switches the switch circuit from an on state to an off state when the input level of the second audio signal exceeds the reference level in comparison in the comparison unit. The audio device according to claim 4, wherein: