JP2000261263A - Sound volume regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent distortion caused by clipping of a signal due to over-rise of the sound volume and to automatically raise the sound volume to the most suitable one with one operation with respect to the sound volume regulator used in various acoustic apparatus including an acoustic adjustment console. SOLUTION: A margin detection means 7 which calculates a rise limit sound volume margin in accordance with the difference between a maximum value of the output of a sound volume regulator 2 and a maximum input level of a device connected to an output terminal 3, a control means 8 which controls a sound volume regulator 2 by the detected margin to raise the sound volume, and an operation means 9 which gives a control start command to the control means 8 are provided. An operator operates the operation means 9 only once to automatically rise the sound volume to the most suitable one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound volume controller mounted on any sound processing device having a sound volume control function, such as a sound control console, a recording / reproducing device, a sound editing device, a sound amplification device, etc. This makes it possible to adjust the volume to an optimum level by simple operation.

[0002]

2. Description of the Related Art In a conventional volume controller, an operator manually adjusts a volume while watching a volume level displayed on a display. As shown in FIG. 9, for example, the volume controller includes an input terminal 1 for inputting a signal, a volume controller 2 for manually adjusting the volume by an operator, and an output terminal for outputting a signal whose volume has been adjusted. 3, volume detection means 4 for detecting the volume of the output signal, maximum value holding means 5 for holding the maximum value of the detected volume, and display means 6 for displaying the detected volume and the maximum value of the volume. It has.

The operation of the conventional volume controller constructed as described above will be described.

[0004] The signal input to the input terminal 1 is amplified or attenuated by the volume control means 2, adjusted to a volume suitable for a device connected to the output terminal 3, and output.

[0005] The volume is adjusted by an operator manually operating the volume control means 2, and at this time, the operator determines the volume according to the following procedure.

The volume detector 4 detects the volume output from the volume controller 2 and displays it on the display 6. The operator
By visually checking this display, the current volume control means 2
Check the level of the signal output by. The sound volume detected by the sound volume detecting means 4 is sent to the maximum value holding means 5 at the same time, the maximum value of the fluctuating sound volume is held there, and the maximum value is sent to the display means 6 for display.
Thus, even when the volume of the input signal fluctuates, the operator can visually check the maximum volume of the output of the volume control unit 2.

As described above, the operator operates the volume control unit 2 to adjust the output level of the volume control unit while monitoring the volume output from the volume control unit 2, and a device connected to the output terminal 3 is provided. Adjust the volume to an appropriate level that does not cause distortion such as signal clipping due to level over.

[0008]

However, in such a conventional volume controller, the operator must manually adjust the volume while judging the level condition by visual confirmation. Also, if a level over occurs inside the volume controller due to excessive volume increase,
The amount of overshoot cannot be confirmed. That is, it cannot be adjusted to the optimum level by adjusting the direction of the downward movement. For this reason, the operator has to repeat the operation of insufficient volume and excessively high volume, and has to operate many times, and it is almost impossible to adjust the volume to the optimum level by one operation.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a sound volume controller which can be adjusted to an optimum sound volume level by a simple operation.

[0010]

Therefore, a volume controller according to the present invention comprises: a volume controller for adjusting the volume of a signal input from an input terminal; a volume detector for detecting a volume output to an output terminal; Maximum value holding means for holding the maximum value of the detected volume, margin detection means for detecting a margin of the volume that can be raised from the difference between the maximum value of the volume and the reference value, and only the detected margin Control means for adjusting the volume control means to increase the volume and operating means for giving a control start command to the control means are provided.
The control means is configured to automatically adjust the volume control means to an optimum volume when the operation is performed twice.

In the volume controller for inputting a plurality of systems of signals from a plurality of input terminals, a volume controller for adjusting the volume of the signals of each system and a signal output from each volume controller are selected. Selection adding means for adding, volume detecting means for detecting the volume that is added and output to the output terminal, maximum value holding means for holding the maximum value of the detected volume, and a maximum value and a reference value of the volume. , A margin detection unit that detects a margin of a volume that can be raised, a selection system extraction unit that extracts a system added by the selection addition unit, and a margin that is detected by the margin detection unit is extracted by the selection system extraction unit. Means for distributing to the selected system, control means for each system for increasing the volume by adjusting the volume control means for each system by the margin distributed from the selection means, and each control means And operating means for providing a control start command is provided, when the operation means is operated once, the control means is configured to adjust the respective volume control means to automatically optimum volume.

Therefore, it is possible to automatically adjust the sound volume to an optimum level by operating the operating means once.
Regarding the volume control for a plurality of inputs, it is possible to automatically raise the volume to an optimum volume without changing the mixing balance by operating the operating means only once.

Also, in the volume controller of the present invention, a volume controller for controlling the volume of each of a plurality of signals input from a plurality of input terminals, and a signal output from each volume controller are selected and added. Selection and addition means, and volume detection means for detecting a volume that is added and output to the output terminal;
Maximum value holding means for holding the maximum value of the detected volume;
From a difference between the maximum value of the volume and the reference value, a margin detection unit that detects a margin of a volume that can be raised, a selection system extraction unit that extracts a system added by the selection addition unit,
There are provided selection means for distributing the margin detected by the margin detection means to the systems extracted by the selected system extraction means, and margin display means for each system for displaying the margin distributed from the selection means to each system.

In this volume controller, the operator can increase the volume of each system step by step while referring to the margin display of each system, thereby preventing the level over due to addition and increasing the overall level. Can be adjusted.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a volume controller for adjusting the volume of a signal input from an input terminal and outputting the signal to a device connected to an output terminal. Volume adjustment means for adjusting the volume of the signal to be output, volume detection means for detecting the volume output to the output terminal, maximum value holding means for holding the maximum value of the detected volume, and the maximum value of this volume and the reference A margin detecting means for detecting a margin of a volume that can be increased from the difference with the value, a control means for adjusting the volume adjusting means by the detected margin to increase the volume, and giving a control start command to the control means. Operating means for operating the operating means once, and the control means automatically adjusts the volume adjusting means to an optimal volume when the operating means is operated once. Just operate It is adjusted automatically to the optimum volume.

According to a second aspect of the present invention, there is provided a volume detecting means for detecting a volume of a signal inputted to the volume adjusting means, a maximum value holding means for holding a maximum value of the detected volume, and an adjustment of the volume adjusting means. An adjustment amount detecting means for detecting the amount, when the volume output to the output terminal exceeds the level,
The amount of adjustment to be reduced by the volume control means is determined from the relationship between the volume level of the signal input to the volume control means and the amount of adjustment of the volume control means, and when the operation means is operated once, the control means controls the volume control means. The level is automatically adjusted to the optimum level by lowering the volume, so that even if a level over occurs inside the volume controller, the operator only needs to operate the operating means once to automatically adjust the volume. Thus, the volume can be reduced to a level just before clipping.

According to a third aspect of the present invention, there is provided a volume control means for controlling the volume of each of a plurality of systems of signals input from a plurality of input terminals, and a signal output from each of the volume control means is selected and added. Selection and addition means, volume detection means for detecting the volume that is added and output to the output terminal, maximum value holding means for holding the maximum value of the detected volume, and a difference between the maximum value of the volume and the reference value A margin detection means for detecting a margin of a volume that can be raised, a selection system extraction means for extracting a system added by the selection addition means, and a margin detected by the margin detection means extracted by the selection system extraction means. And a margin display unit for each system that displays a margin distributed to each system from the selection system. With reference to the display, the volume of each strain that will stepwise raised, while preventing the level over by addition, it is possible to adjust the overall level easily.

According to a fourth aspect of the present invention, there is provided a volume control means for controlling the volume of each of a plurality of systems of signals input from a plurality of input terminals, and a signal output from each volume control means is selected and added. Selection addition means, volume detection means for detecting the volume that is added and output to the output terminal, maximum value holding means for holding the maximum value of the detected volume, and a difference between the maximum value of the volume and the reference value. A margin detecting means for detecting a margin of a volume that can be raised, a selected system extracting means for extracting a system added by the selecting and adding means, and a system extracted by the selected system extracting means for a margin detected by the margin detecting means. Control means for adjusting the volume control means of each system to increase the volume by the amount of the margin distributed from the selection means, and controlling each of the control means. Operating means for giving a command, wherein when the operating means is operated once, each control means automatically adjusts the respective sound volume adjusting means to an optimum sound volume. It is possible to automatically raise the volume to an optimum volume by changing the volume of the input of the system only once by operating the operation means without changing the mixing balance.

According to a fifth aspect of the present invention, the margin detecting means calculates the margin using a maximum input level of a device connected to the output terminal as a reference value,
In the device connected to the output terminal, the volume is adjusted to an appropriate level that does not cause distortion such as signal clipping due to level over.

According to a sixth aspect of the present invention, a setting means for setting the reference value is provided, and the margin detecting means calculates the margin using the reference value set by the setting means. Not only is it easy to change the reference value when the device connected to the output terminal is changed, but also it is possible to automatically raise the volume to the operator's desired volume, for example, the volume of the input signal is uncertain In such a case, it is possible to make the margin more margin by taking the rise into account.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

(First Embodiment) As shown in FIG. 1, a volume controller according to a first embodiment has an input terminal 1 for inputting a signal, a volume controller 2 for adjusting the volume, and a volume controller for adjusting the volume. Output terminal 3 from which the detected signal is output, volume detection means 4 for detecting the volume of the output signal, maximum value holding means 5 for holding the maximum value of the detected volume, and maximum value holding means 5 Margin detecting means 7 for detecting a margin between the maximum value and the reference level, operating means 9 operated by an operator when adjusting the volume level, and volume adjusting means 2 for the margin when operating means 9 is operated. And a control means 8 for adjusting the volume and increasing the volume.

The operation of the volume controller will be described.

The signal input to the input terminal 1 is, for example, V
The signal is amplified or attenuated by a volume control means 2 including a CA (Voltage Control Amplifier) or a motor-driven volume and an amplifier, and output to a device connected to the output terminal 3.

The volume detecting means 4 detects the volume output from the volume adjusting means 2 by, for example, a comparator or the like, and sends it to the maximum value holding means 5. The maximum value holding means 5 holds the maximum value by, for example, a sample-and-hold circuit or the like and sends it to the margin detecting means 7. The margin detection means 7 compares the level between a preset reference level and this maximum value by, for example, a comparator or the like, and calculates a margin with respect to the reference level by, for example, a subtraction circuit. This reference level is set, for example, to the maximum input level of the device connected to the output terminal 3. Margin detecting means 7
Sends the calculated margin to the control means 8.

As described above, the control means 8 is always supplied with the amount of adjustment of the volume which can be raised with respect to the signal which has been input up to that time. The control unit 8 is configured by, for example, a linear amplifier or a servo amplifier, and converts the adjustment amount input from the margin detection unit 7 into a control amount of the control target (the volume adjustment unit 2). Further, the control means 8 operates until the operation means 9 is operated and a trigger generated thereby is given.
Its output is open or kept constant.

When the operator operates the operation means 9 constituted by, for example, a push switch, a trigger is given to the control means 8, and the control means 8 controls the volume control means 2 based on the previous control amount. Start.

Therefore, the volume controller can adjust the signal to an appropriate level without causing distortion such as signal clipping due to level over in the device connected to the output terminal 3. Further, it is possible to automatically raise the volume to the optimum volume only by operating the operation means 9 once.

When the input / output signals are represented by digital data, the volume controller 2 is constituted by, for example, a digital signal processor of a DSP, and the other means is a CPU.
And the like.

(Second Embodiment) The volume controller of the second embodiment can set the reference level for margin calculation to a predetermined value.

As shown in FIG. 2, the volume controller includes a setting means 10 for setting a reference level for margin calculation. Other configurations are the same as those of the first embodiment (FIG. 1).

The operation of the volume controller will be described.

The setting means 10 is constituted by, for example, a potentiometer or the like.
The volume is converted into a volume value representing the volume level, and the margin detection means 7
Send to The margin detecting means 7 performs a level comparison with the maximum value input from the maximum value holding means 5 using the volume value sent from the setting means 10 as a reference level, calculates a margin with respect to the reference level, and sends it to the control means 8. send. Other operations are the same as in the first embodiment.

Note that, similarly to the first embodiment, when the input / output is digital data, the setting
What is necessary is just to comprise by arithmetic processing using U etc.

In the volume controller of this embodiment, when the device connected to the output terminal 3 is changed, it is easy to change the reference level for margin calculation. Also, a desired level lower than the maximum input level of the device connected to the output terminal 3 is set as a reference level for margin calculation,
The volume can be automatically increased to that level.
For example, when the volume of the input signal is uncertain, it is possible to make the margin more margin by taking the rise into account.

(Third Embodiment) The volume controller according to the third embodiment can eliminate the occurrence of level over in one operation.

As shown in FIG. 3, the volume controller includes a volume detector 4a for detecting the volume of the input signal, a maximum value holder 5a for holding the maximum value of the signal, and a volume controller 2a.
An adjusting amount detecting means 12 for detecting an adjusting amount of the control signal, and a judging means 11 for judging an adjusting amount to be decreased when a level over occurs in the volume controller.
The adjustment amount determined in 11 is sent to the control means 8. Other configurations are the same as those of the first embodiment (FIG. 1).

The operation of the volume controller will be described.

The volume detection means 4a detects the volume of the input signal, and the maximum value holding means 5a holds the maximum value of the volume and sends it to the determination means 11. The adjustment amount detecting means 12 is constituted by, for example, a linear amplifier or the like.
, That is, the current amplification degree or attenuation amount is detected and sent to the determination means 11.

The volume detecting means 4b is provided with the volume adjusting means 2
, And sends it to the maximum value holding means 5b. The maximum value holding means 5b holds the maximum value and sends it to the margin detecting means 7, and outputs the same to the margin detecting means 7.
Performs a level comparison between a preset reference level and this maximum value, calculates a margin with respect to the reference level, and sends it to the determination means 11.

The judging means 11 is constituted by, for example, a subtraction circuit or the like. If there is a margin inputted from the margin detecting means 7, the judging means 11 sends the margin (that is, an adjustable amount of the volume which can be raised) to the control means 8, If there is no margin, the relationship between the level of the input signal given by the maximum value holding means 5a and the current adjustment amount of the volume adjustment means 2 given by the adjustment amount detection means 12 causes The amount of adjustment to be reduced is determined and sent to the control means 8.

The control means 8 converts the adjustment amount input from the determination means 11 into a control amount of the volume control means 2 and, when the operator operates the operation means 9, the volume control means based on the control amount. 2 is controlled.

The determining means 11 and the adjustment amount detecting means 12
As in the case of the first embodiment, when the input and output are digital data, the processing may be performed by an arithmetic process using a CPU or the like.

As described above, with this volume controller, even if a level over occurs internally, it is possible to automatically lower the volume to a level just before clipping by one operation.

(Fourth Embodiment) As shown in FIG. 4, a volume controller according to a fourth embodiment sets, to a margin detecting means 7, a setting means 10 for setting a reference level for margin calculation.
Is provided. The other configuration is the third embodiment (FIG. 3)
There is no change. This setting means 10 is the same as that described in the second embodiment, converts the set value set by the operator into a volume value representing a volume level, sends it to the margin detecting means 7, and sends it to the margin detecting means 7. 7 is setting means 10
The margin is calculated on the basis of the volume value sent from.

In this volume controller, when the device connected to the output terminal 3 is changed, the reference level can be easily changed. In addition, it is possible to set the desired level lower than the maximum input level of the device connected to the output terminal 3 as a reference level for margin calculation, and to automatically lower the volume, for example, gradually around the maximum input level. The usability in the case where a device in which the distortion rate deteriorates or the tone color changes is connected is greatly improved.

(Fifth Embodiment) In the fifth embodiment,
A volume controller having a plurality of input signals will be described.

As shown in FIG. 5, the volume controller includes a plurality of input terminals 1, volume control means 2 for controlling the volume of a signal input from each input terminal 1, and a display for displaying a margin of each system. Means 6, a selection and addition means 13 for adding signals of a system selected from a plurality of systems, an output terminal 3 from which the signal added by the selection and addition means 13 is output, and a volume of the added signal. Volume detection means 4 for detecting, maximum value holding means 5 for holding the maximum value of the detected volume, and margin detection means for detecting a margin between the maximum value held by the maximum value holding means 5 and the reference level 7, a selection unit 17 that distributes the output of the margin detection unit 7 to the display unit 6 of the selected system and sends it, and a selected system extraction unit 15 that transmits the system selected by the selection and addition unit 13 to the selection unit 17. Have.

The operation of the volume controller will be described.

The selection and addition means 13 is constituted by, for example, a switch and an addition circuit for each system, and adds all the signals of the selected system out of the input signals of the plurality of systems and sends the result to the output terminal 3. I do. The selected system extracting means 15 is composed of, for example, a switch which is switched in conjunction with a switch of each system of the selecting and adding means 13 and sends to the selecting means 16 which system is currently selected.

The volume detecting means 4 includes a selection adding means 13
, And sends the volume to the maximum value holding means 5, which holds the maximum value and sends it to the margin detection means 7, and the margin detection means 7 The level is compared with the maximum value, and a margin with respect to the reference level is calculated and sent to the selecting means 17.

The selecting means 17 is composed of, for example, a distributor and an individual switch for each system, and distributes the output of the margin detecting means 7 to the display means 6 of each system corresponding to the output of the selected system extracting means 15. And send.

The display means 6 is, for example, an LED bar graph.
It is composed of a numerical display such as a meter and a dot display, etc., is individually arranged in each system, and displays a value corresponding to the input amount input from the selection means 17. The operator operates the volume control means 2 of each system with reference to the display on the display means 6 to adjust the input of each system.

In this volume controller, whether the output of the selective adding means 13 produced by adjusting the volume of each input has a margin with respect to the maximum input level of the device connected to the output terminal 3, Alternatively, whether or not the level is exceeded is notified to the operator through the display means 6 of each system, and the operator adjusts the input of each system by watching this.

At this time, the display means 6 of each system displays a reference amount for adjusting the volume of each system, and if there is a margin in the output volume, the input means of each system is displayed. It can be understood how much the sound volume can be increased. Accordingly, the overall level can be adjusted without changing the mixing balance while preventing a level over due to addition by gradually increasing the volume for each system while referring to the margin display of each system.

The selection adding means 13 and the selected system extracting means
As in the first embodiment, when the output is digital data, the selecting unit 15 and the selecting unit 16 may be configured by arithmetic processing using a DSP and a CPU.

(Sixth Embodiment) As shown in FIG. 6, a volume controller according to a sixth embodiment sets a reference level for margin calculation to a margin detection unit 7 by a setting unit 10.
Is provided. Other configurations are the fifth embodiment (FIG. 5)
There is no change. This setting means 10 is the same as that described in the second embodiment, converts the set value set by the operator into a volume value representing a volume level, sends it to the margin detecting means 7, and sends it to the margin detecting means 7. 7 is setting means 10
The margin is calculated on the basis of the volume value sent from.

In this volume controller, the reference level can be easily changed when the device connected to the output terminal 3 is changed, and the maximum level of the device connected to the output terminal 3 is used as a reference level for margin calculation. It is easy to adjust not only the input level but also the overall level to a desired level set by the operator.

(Seventh Embodiment) The volume controller of the seventh embodiment can automatically adjust the volume of a plurality of input signals by operating the operation means once.

As shown in FIG. 7, this volume controller comprises control means 8 for controlling the volume control means 2 of each system, instead of display means, and operation means for giving a trigger for control start to each control means 2. 9 is provided. Other configurations are the same as those of the fifth embodiment (FIG. 5).

The operation of the volume controller will be described.

The control means 8 is constituted by, for example, a linear amplifier or a servo amplifier, and is arranged corresponding to each of the volume control means 2 of each human power system. It is converted into a corresponding control amount of the volume control means 2. Further, the output of the control means 8 is kept open or kept constant until a trigger generated by operating the operation means 9 is given.

When the operator operates the operating means 9 constituted by, for example, a push switch or the like, a trigger is given to the control means 8, and each control means 8 controls each volume control means 2 based on the converted control amount. Start control. As a result, the volume of the input of all the systems selected by the selection and addition means 13 is set to an appropriate level, that is, a distortion such as a signal clip due to a level over in a device connected to the output terminal 3 does not occur. Will be adjusted all at once to the appropriate level.

When the input / output is digital data, the control means 8 controls the DSP and the C as in the first embodiment.
What is necessary is just to comprise by arithmetic processing using PU.

As described above, in the volume controller of this embodiment, when performing volume control for a plurality of input systems,
By operating the operating means only once, it is possible to automatically raise the volume to an optimum level without changing the mixing balance.

(Eighth Embodiment) As shown in FIG. 8, a volume controller according to an eighth embodiment sets a reference level for margin calculation to a margin detector 7 by a setting unit 10.
Is provided. The other configuration is the seventh embodiment (FIG. 7)
There is no change. This setting means 10 is the same as that described in the second embodiment, converts the set value set by the operator into a volume value representing a volume level, sends it to the margin detecting means 7, and sends it to the margin detecting means 7. 7 is setting means 10
The margin is calculated on the basis of the volume value sent from.

In this volume controller, when the device connected to the output terminal 3 is changed, the reference level can be easily changed. Further, the volume can be automatically increased to a desired level set by the setting means 10 by the operator with a single operation of the operation means 9 without changing the mixing balance. If the volume is uncertain,
By taking the rise into account, it is possible to make the margin more marginal.

[0068]

As is apparent from the above description, the volume controller of the present invention can automatically raise the volume to the optimum volume by operating the device once with the device provided with the operating means. It is possible.

Further, in the apparatus provided with the volume detection means of the input signal, even if the level is over in the volume controller, the volume is automatically reduced to a level just before clipping by one operation. Is possible.

In the case where the display means is provided in each input system, the volume is increased stepwise while referring to the margin display of each system, so that level over due to addition of signals can be prevented while mixing. It is possible to adjust the overall level without changing the balance.

Further, in the case where the control means for controlling the volume control means of each system is provided, when the volume control is performed for the inputs of a plurality of systems, only one operation of the operation means is required.
It is possible to automatically raise the volume to an optimum level without changing the mixing balance.

In the case where the setting means is added to the margin detecting means, when the device connected to the output terminal is changed, it is easy to change the reference level for calculating the margin. Further, it is possible to automatically lower the volume to a desired level set by this setting means, and when the volume of the input signal is uncertain, add a margin to the margin by taking the increase into account. When a device that gradually deteriorates the distortion near the maximum input level or changes the timbre is connected, the margin can be calculated by lowering the reference level.

[Brief description of the drawings]

FIG. 1 is a block diagram of a volume controller according to a first embodiment of the present invention;

FIG. 2 is a block diagram of a volume controller according to a second embodiment of the present invention;

FIG. 3 is a block diagram of a volume controller according to a third embodiment of the present invention;

FIG. 4 is a block diagram of a volume controller according to a fourth embodiment of the present invention;

FIG. 5 is a block diagram of a volume controller according to a fifth embodiment of the present invention;

FIG. 6 is a block diagram of a volume controller according to a sixth embodiment of the present invention;

FIG. 7 is a block diagram of a volume controller according to a seventh embodiment of the present invention;

FIG. 8 is a block diagram of a volume controller according to an eighth embodiment of the present invention;

FIG. 9 is a block diagram of a conventional volume controller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input terminal 2 Volume control means 3 Output terminal 4 Volume detection means 5 Maximum value holding means 6 Display means 7 Margin detection means 8 Control means 9 Operation means 10 Setting means 11 Judgment means 12 Adjustment amount detection means 13 Selection addition means 15 Selection system Extraction means 17 Selection means

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Claims (6)

[Claims] 1. A volume controller for adjusting the volume of a signal input from an input terminal and outputting the signal to a device connected to an output terminal, wherein the volume control means adjusts the volume of a signal input from the input terminal. Volume detection means for detecting the volume output to the device; maximum value holding means for holding the detected maximum value of the volume; and a margin for the volume that can be raised from the difference between the maximum value of the volume and a reference value. Margin detecting means for detecting, control means for adjusting the volume adjusting means by the detected margin to increase the volume, and operating means for giving a control start command to the control means, The volume controller, wherein the control unit automatically adjusts the volume control unit to an optimum volume when the operation unit is operated once. 2. A volume detecting means for detecting a volume of a signal input to the volume adjusting means, a maximum value holding means for holding a detected maximum value of the volume, and detecting an adjustment amount of the volume adjusting means. An adjustment amount detection unit, wherein when the volume output to the output terminal exceeds the level, the volume adjustment is performed based on a relationship between a volume level of a signal input to the volume adjustment unit and an adjustment amount of the volume adjustment unit. Determining an adjustment amount to be reduced by the means, and when the operation means is operated once, the control means adjusts the volume control means to lower the volume so that the volume automatically becomes an optimum level. The volume controller according to claim 1, wherein the volume is adjusted. 3. A volume controller for adjusting a volume of a signal input from an input terminal and outputting the signal to a device connected to an output terminal, wherein the volume of each of signals of a plurality of systems input from the plurality of input terminals is adjusted. Volume adjustment means, selection and addition means for selecting and adding signals output from each volume adjustment means, volume detection means for detecting the volume that is added and output to the output terminal, and a maximum of the detected volume Maximum value holding means for holding a value; margin detecting means for detecting a margin of a volume that can be raised from a difference between the maximum value of the volume and a reference value; and selection for extracting a system added by the selection and addition means. System extracting means; selecting means for distributing a margin detected by the margin detecting means to the systems extracted by the selected system extracting means; Volume control, characterized by comprising the margin display unit of each system that displays the margin is. 4. A volume controller for adjusting the volume of a signal input from an input terminal and outputting the signal to a device connected to an output terminal, wherein the volume of each of signals of a plurality of systems input from the plurality of input terminals is adjusted. Volume adjustment means, selection and addition means for selecting and adding signals output from each volume adjustment means, volume detection means for detecting the volume that is added and output to the output terminal, and a maximum of the detected volume Maximum value holding means for holding a value; margin detecting means for detecting a margin of a volume that can be raised from a difference between the maximum value of the volume and a reference value; and selection for extracting a system added by the selection and addition means. System extracting means; selecting means for distributing a margin detected by the margin detecting means to the system extracted by the selected system extracting means; Control means for increasing the volume by adjusting the volume control means of each system by an amount corresponding to the number of operating systems; and operating means for giving a control start command to each of the control means, wherein the operating means is operated once. A volume controller, wherein each of the control means automatically adjusts each volume control means to an optimum volume when operated. 5. The volume controller according to claim 1, wherein the margin detecting means calculates the margin using a maximum input level of a device connected to an output terminal as the reference value. . 6. The apparatus according to claim 1, further comprising setting means for setting the reference value, wherein the margin detecting means calculates the margin using the reference value set by the setting means. The volume controller according to 3 or 4.