JP2011223170A - Sound volume control device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound volume control device which enables listening of speech in a proper sound volume corresponding to a speech output device connected to an output terminal when the output terminal is used in common by a plurality of types of speech output devices, and to provide a display device equipped with the sound volume control device.SOLUTION: The sound volume control device is configured to select one of a plurality of sound volumes corresponding to a first speech output device 51 and a second speech output device 52 to be connected to the output terminal 5. Consequently, even when the second speech output device 52 and the first speech output device 51 emitting a sound volume smaller than that of the second speech output device 52 use the output terminal 5 in common, an excessive sound volume is not emitted from the first speech output device 51, which avoids excessive burden onto user's drum membrane.

Description

  The present invention relates to a volume control device that controls a volume based on an audio signal output from an output terminal, and a display device including the volume control device.

  In recent years, portable terminal devices equipped with tuners that receive broadcast waves have become widespread. The mobile terminal device includes an output terminal for outputting an audio signal, and a user of the mobile terminal device listens to audio based on broadcast waves by connecting an audio output device such as an earphone to the output terminal. be able to. Japanese Patent Application Laid-Open No. 2004-228561 can select a normal activation mode in which an audio signal having a normal volume is output from an output terminal and a manner activation mode in which an audio signal having a volume smaller than that in the normal activation mode is output from an output terminal. A terminal device (mobile phone) is disclosed. In the mobile phone described in Patent Literature 1, when the user selects the manner activation mode, the volume output from the earphone is reduced, and sound leakage to the surroundings can be surely prevented in a public space such as a train. it can.

  The thin display device installed indoors also has an output terminal like the mobile phone, and by connecting an audio output device such as headphones to the output terminal, sound leakage to the surroundings can be prevented. . Conventionally, display devices have been provided with an output terminal for connecting an audio output device that requires a louder volume than headphones, for example, an external speaker (monitor out), separately from the output terminal for connecting headphones. In order to reduce the thickness, a display device in which headphones and monitor out share an output terminal has been proposed.

International Publication No. 2008/015864 Pamphlet

  In order to improve the convenience of the display device as well, it is conceivable that the volume related to the audio signal to be output to the output terminal can be selected like the mobile phone described in Patent Document 1. However, the volume suitable for use differs between the headphones and the monitor out. Therefore, when it is configured so that a plurality of volumes can be selected so as to correspond to monitor-out, a volume corresponding to monitor-out can be selected, but an audio signal having a volume corresponding to monitor-out is output. However, when the headphones are connected to the output terminal, sound is emitted from the headphones at an excessive volume regardless of the selection of the volume. As a result, an excessive load is applied to the user's eardrum, which may cause discomfort to the user.

  The present invention has been made in view of such circumstances, and when the output terminal is shared by a plurality of types of audio output devices, the sound is heard at an appropriate volume corresponding to the audio output device connected to the output terminal. An object of the present invention is to provide a sound volume control device that can be used and a display device including the sound volume control device.

  The volume control device according to the present invention includes an output terminal that outputs an audio signal, an accepting unit that accepts a volume related to the audio signal output from the output unit, and the output according to the volume received by the accepting unit In a volume control device comprising a setting unit for setting a volume related to an audio signal output from a terminal, a plurality of audio output devices share the output terminal, and each corresponds to each of the plurality of audio output devices A storage unit configured to store a volume, wherein the reception unit is configured to receive any volume from the volumes stored in the storage unit, and the setting unit is configured to receive any volume received by the reception unit. Is set.

  In the present invention, one volume can be selected from a plurality of volumes corresponding to the audio output device connected to the output terminal. Therefore, even when the monitor-out and the headphones that emit a smaller volume than the monitor-out share the output terminal, it is possible to prevent an excessive volume from being emitted from the headphones by selecting an appropriate volume. Also, by setting the sound volume output from the sound output device (such as headphones and earphones) attached to the ear and the sound volume output from another sound output device to a predetermined value or less, the ear volume is set. No matter which audio output device or other audio output device is attached to the output terminal, the user's eardrum is not overloaded.

  In the volume control device according to the present invention, the plurality of audio output devices include one audio output device worn on an ear and another audio output device, and the plurality of volumes stored in the storage unit are: A detection means for detecting that the sound output device is connected to the output terminal, the detection means including one sound volume corresponding to the one sound output device and another sound volume corresponding to the other sound output device; When the means detects that the audio output device is connected, the setting unit includes means for forcibly setting the one volume or another volume.

  In the present invention, when an audio output device is connected to the output terminal, one preset volume or another volume is forcibly set. By setting one volume or the other volume to be equal to or lower than a predetermined value, the user's eardrum is excessive even if either the audio output device worn on the ear or the other audio output device is connected to the output terminal. There is no load.

  The volume control device according to the present invention is a notification means for notifying that the one volume or the other volume is forcibly set when the detection means detects that a voice output device is connected. It is characterized by providing.

  In the present invention, the user is prompted to select a volume corresponding to the audio output device connected to the output terminal by notifying the user that one volume or another volume has been forcibly set. it can.

  A display device according to the present invention includes the above-described volume control device and a display unit that displays an image, and the notification unit indicates that the one volume or another volume is forcibly set. It is characterized by being displayed on the screen.

  In the present invention, when one volume or another volume is forcibly set, the user is visually informed that the one volume has been forcibly set.

  A display device according to the present invention includes the above-described volume control device and a display unit that displays an image, and the reception unit selects one of the volume levels from the volume levels stored in the storage unit. The options are displayed on the display unit.

  In the present invention, the volume is selected through the user's vision by displaying the options on the display unit.

  In the sound volume control device and the display device according to the present invention, the sound volume corresponding to the sound output device connected to the output terminal can be selected, for example, the monitor out and the headphones that emit a smaller sound volume than the monitor out Even when the output terminal is shared, since the excessive sound volume is not emitted from the headphones, the user can listen to the sound at a sound volume suitable for the sound output device connected to the output terminal.

It is an external appearance perspective view which shows the display apparatus which concerns on embodiment. It is a block diagram which shows the volume control apparatus of the display apparatus which concerns on embodiment. It is a schematic diagram which shows an example of the operation screen displayed on the display part of the display apparatus which concerns on embodiment. It is a flowchart which shows the volume setting preliminary | backup process by the volume control apparatus of the display apparatus which concerns on embodiment. It is a schematic diagram which shows an example of the alerting | reporting screen displayed on the display part of the display apparatus which concerns on embodiment. It is a flowchart which shows the volume setting process by the volume control apparatus of the display apparatus which concerns on embodiment.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating a display device according to an embodiment. FIG. 1 is an external perspective view showing a display device.
In the figure, reference numeral 1 denotes a display device. The display device 1 includes a front cabinet 2 having a rectangular frame shape. On the rear side of the front cabinet 2, a rectangular box-shaped rear cabinet 3 having a front surface opened is provided. The vertical and horizontal dimensions of the rear cabinet 3 are substantially the same as those of the front cabinet 2, and the engaging portion of the front cabinet 2 and the engaged portion of the rear cabinet 3 (both not shown) are engaged.

  The front cabinet 2 accommodates a rectangular plate-like display unit 4. The display unit 4 faces the front part of the front cabinet 2. The display unit 4 includes a liquid crystal, and is configured to adjust the transmissivity of light transmitted through the display unit 4 by controlling a voltage applied to the liquid crystal. Control of the voltage applied to the liquid crystal is performed via a TFT (Thin Film Transistor). A light source (not shown) such as an LED (Light Emitting Diode) or a cold cathode fluorescent tube is disposed on the rear side of the display unit 4. An output terminal 5 (for example, a jack) for outputting an audio signal is provided on the side surface of the front cabinet 2. The output terminal 5 outputs an audio signal controlled by a volume control device 20 described later.

FIG. 2 is a block diagram showing the volume control device 20. In FIG. 2, white arrows indicate dedicated paths for data relating to video and audio.
The volume control device 20 includes a control unit 21, a tuner 22, a broadcast signal processing unit 23, a light receiving unit 24, a decoder 25, a medium signal processing unit 26, and a video output that are connected to each other via a common bus. Unit 27, audio output unit 28, volume setting unit 29, audio output switching unit 30, and mute circuit 31.

  The volume control device 20 also includes a detection switch 32 that detects that input terminals (for example, plugs) 51 a and 52 a are connected to the output terminal 5, and a remote control device 33. The remote operation device 33 includes a plurality of operation switches. By operating the operation switches, the remote operation device 33 receives a sound volume related to an audio signal output from the output terminal 5 and outputs a signal indicating the sound volume to the light receiving unit 24. Instead of the remote operation device 33, a wired operation unit or operation device may be provided. In this case, the operation unit or the operation device accepts the volume related to the audio signal output from the output terminal 5 and outputs a signal indicating the volume to the control unit 21.

  The control unit 21 includes an MPU (Micro Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, reads a control program stored in the ROM into the RAM, and performs processing related to video output and audio output. Execute. A detection signal indicating that the input terminals 51 a and 52 a are connected to the output terminal 5 is input from the detection switch 32 to the control unit 21. The ROM stores material data for displaying video.

  The tuner 22 is connected to the antenna 60. The tuner 22 receives a broadcast wave from the antenna 60 and extracts a broadcast signal of a channel designated by the control unit 21 from the input broadcast wave. The tuner 22 outputs the extracted broadcast signal to the broadcast signal processing unit 23. The broadcast signal includes video data and audio data.

  The broadcast signal processing unit 23 includes, for example, an IF (InterFace) circuit, an audio detection circuit, a video detection circuit, an A / D (Analog / Digital) conversion circuit (all not shown), and the like. The broadcast signal processing unit 23 outputs the video data and audio data of the broadcast signal output from the tuner 22 to the video output unit 27 and the audio output unit 28, respectively.

  The light receiving unit 24 receives the infrared signal output from the remote operation device 33 and outputs an operation signal based on the received infrared signal. The control unit 21 controls the tuner 22, the broadcast signal processing unit 23, the decoder 25, the medium signal processing unit 26, the video output unit 27, the audio output unit 28, the volume setting unit 29, and the audio output switching unit 30 based on the operation signal. And the mute circuit 31 is controlled.

  The decoder 25 is connected to a recording medium driving device 61 that reads data from a recording medium such as an optical disk. The decoder 25 takes in and decompresses data compressed from the recording medium driving device 61, for example, data compressed by MPEG (Moving Picture Experts Group). The decoder 25 outputs the decompressed data to the medium signal processing unit 26. The decoder 25 performs predetermined processing such as error detection and correction processing on the captured data.

  The medium signal processing unit 26 extracts video data and audio data from the data input from the decoder 25, and outputs the extracted video data and audio data to the video output unit 27 and the audio output unit 28, respectively.

  The video output unit 27 is connected to the display unit 4 that displays video. The display unit 4 includes, for example, a liquid crystal display panel, an organic EL panel, or a plasma display. The video output unit 27 generates a display signal based on the video data input from the broadcast signal processing unit 23 or the medium signal processing unit 26. The video output unit 27 outputs the generated display signal to the display unit 4.

  The audio output unit 28 generates an audio signal based on the audio data input from the broadcast signal processing unit 23 or the medium signal processing unit 26, and outputs the generated audio signal to the volume setting unit 29.

  The volume setting unit 29 sets the volume related to the audio signal input from the audio output unit 28 based on a command from the control unit 21. The volume setting unit 29 includes a storage unit 29a. In the storage unit 29a, a first initial volume set when an input terminal 51a of a first audio output device (for example, a headphone or an earphone) 52 to be worn on the ear is connected to the output terminal 5; When an input terminal 52a of an audio output device (hereinafter referred to as monitor-out) 52 that requires a larger volume than the first audio output device 51 that is worn on the ear is connected to the output terminal 5 when listening to sound. The second initial volume to be set is stored. An example of the monitor out is an external speaker. The storage unit 29a includes a storage area, and a flag for setting the first initial volume or the second initial volume can be set in the storage area.

  The first initial volume and the second initial volume are −36 [dBFS] or less. The sound volume is a sound volume that does not give an excessive load to the user's eardrum when the sound is output at the sound volume from the sound output device worn on the ear, and does not give the user discomfort.

  The second initial volume is a volume that is perceived by the user as approximately the same volume as when the sound is output at the first initial volume from the audio output device worn on the ear when the sound is output at the volume from the monitor out. It is.

  The audio output switching unit 30 switches the output destination of the audio signal input from the audio output unit 28 to the output terminal 5 or the mute circuit 31. The audio output switching unit 30 is configured to receive a detection signal from the detection switch 32, and switches the output destination of the audio signal to the output terminal 5 when the detection signal is input. Further, the audio output switching unit 30 switches the output destination of the audio signal based on a command from the control unit 21.

  The mute circuit 31 is configured to output an audio signal to the built-in speaker 6 via the amplifier 41. When the mute circuit 31 is in the on state, no audio signal is output from the mute circuit 31 to the built-in speaker 6. When the mute circuit 31 is in the off state, an audio signal is output from the mute circuit 31 to the built-in speaker 6.

  When a detection signal is input from the detection switch 32 to the control unit 21, the control unit 21 transmits an on command to the mute circuit 31. The mute circuit 31 that has received the on command is turned on.

  When the output destination of the audio signal is switched to the output terminal 5 in the audio output switching unit 30, the audio signal is output from the audio output switching unit 30 to the output terminal 5 via the amplifier 40. In the present embodiment, data related to video and audio is output through a dedicated path, but the present invention is not limited to this, and may be configured to be output via a common bus, for example. .

  When the volume control device 20 receives a command for setting the volume related to the audio signal output from the output terminal 5 from the remote operation device 33, the volume control device 20 displays an operation screen 71 (see FIG. 3) to be described later together with material data stored in the ROM. A command to be displayed is transmitted to the video output unit 27. The video output unit 27 generates a display signal for displaying the operation screen 71 based on the received material data, and outputs the display signal to the display unit 4. The display unit 4 that has received the generated display signal displays an operation screen 71.

FIG. 3 is a schematic diagram illustrating an example of the operation screen 71 displayed on the display unit 4.
The operation screen 71 includes a title part 71a, an explanation part 71b, a first selection button 71c, and a second selection button 71d. An explanation portion 71b is arranged below the title portion 71a, and a first selection button 71c and a second selection button 71d are arranged on the left and right sides below the explanation portion 71b.

  The title portion 71 a is a title indicating that the volume is set according to the purpose of the operation screen 71, that is, the audio output device connected to the output terminal 5. Note that “headphone” in FIG. 3 corresponds to the first audio output device 51 attached to the ear, and “monitor out” is larger than the first audio output device 51 attached to the ear when the user listens to the sound. It corresponds to the second audio output device 52 that requires a volume.

The explanation unit 71 b displays an explanation for confirming which of the first audio output device 51 and the second audio output device 52 is connected to the output terminal 5.
The first selection button 71 c is a button that is pressed when the first audio output device 51 is connected to the output terminal 5. The second selection button 71 d is a button that is pressed when the second audio output device 52 is connected to the output terminal 5. The user operates the remote operation device 33 as necessary, and presses the first selection button 71c or the second selection button 71d displayed on the operation screen 71.

  When the sound volume control device 20 receives a command for setting the sound volume related to the sound signal output from the output terminal 5 from the remote operation device 33 when the sound output device is not connected to the output terminal 5, the sound volume control device 20 A volume setting preliminary process is executed as a stage before setting the volume. FIG. 4 is a flowchart showing the volume setting preliminary processing by the volume control device 20.

  The control unit 21 of the volume control device 20 stands by until a command for setting the volume related to the audio signal output from the output terminal 5 is received from the remote operation device 33 (step S1: NO). When the command for setting the volume related to the audio signal output from the output terminal 5 is received from the remote operation device 33 (step S1: YES), the control unit 21 operates the material data stored in the ROM in the video output unit 27. A command for displaying the screen 71 is transmitted (step S2).

  Next, the control unit 21 determines whether or not a signal indicating that the first selection button 71c has been pressed is received from the remote control device 33 (step S3). When the signal indicating that the first selection button 71c is pressed is received from the remote operation device 33 (step S3: YES), the control unit 21 accesses the storage unit 29a of the volume setting unit 29 and sets the first initial volume. A flag for setting is set (step S4). When the first audio output device 51 such as headphones or earphones is connected to the output terminal 5, it is assumed that the user presses the first selection button 71c. And the control part 21 complete | finishes a process.

  When the signal indicating that the first selection button 71c is pressed is not received from the remote operation device 33 (step S3: NO), the control unit 21 confirms that the second selection button 71d is pressed from the remote operation device 33. It is determined whether or not the indicated signal has been received (step S5). When the signal indicating that the second selection button 71d has been pressed is not received from the remote operation device 33 (step S5: NO), the control unit 21 returns the process to step S3. When a signal indicating that the second selection button 71d has been pressed is received from the remote operation device 33 (step S5: YES), the control unit 21 accesses the storage unit 29a of the volume setting unit 29 and sets the second initial volume. A flag for setting is set (step S6). When the second audio output device 52 (monitor out) is connected to the output terminal 5, it is estimated that the user presses the second selection button 71d.

  The control unit 21 can set only one of the two flags, and cannot set two flags at the same time.

  FIG. 5 is a schematic diagram illustrating an example of the notification screen 72 displayed on the display unit 4. When the input terminals 51 a and 52 a are connected to the output terminal 5, the control unit 21 transmits a command for displaying the notification screen 72 together with the material data stored in the ROM to the video output unit 27. The video output unit 27 generates a display signal for displaying the notification screen 72 based on the received material data, and outputs the display signal to the display unit 4. The display unit 4 that has received the generated display signal displays the notification screen 72.

  The notification screen 72 includes a title part 72a and an explanation part 72b. An explanation part 72b is arranged below the title part 72a. The title part 72a is a title indicating the purpose of the notification screen 72, that is, a notice to the user. The explanation unit 72b displays that the first initial volume is set as the volume by connecting the input terminals 51a and 52a, that is, the audio output device, to the output terminal 5. In FIG. 5, “The volume was lowered to prevent excessive output” corresponds to the setting of the first initial volume.

  Next, the volume setting process by the volume control device 20 will be described. FIG. 6 is a flowchart showing the volume setting process by the volume control device 20.

  The control unit 21 of the volume control device 20 waits until a detection signal indicating that the input terminals 51a and 52a are connected is input from the detection switch 32 (step S11: NO). When a detection signal indicating that the input terminals 51a and 52a are connected is input from the detection switch 32 (step S11: YES), the control unit 21 transmits an ON command to the mute circuit 31 (step S12).

  And the control part 21 transmits the instruction | command which displays the alerting | reporting screen 72 with the raw material data stored in ROM to the image | video output part 27 (step S13). Next, the control unit 21 accesses the storage unit 29a of the volume setting unit 29, and sets the flagged first initial volume or second initial volume in the volume setting unit 29 (step S14).

  Next, the control unit 21 transmits a command for displaying the operation screen 71 together with the material data stored in the ROM to the video output unit 27 (step S15, see FIG. 3). Then, it is determined whether a signal indicating that the first selection button 71c has been pressed is received from the remote control device 33 (step S16). When a signal indicating that the first selection button 71c has been pressed is received from the remote control device 33 (step S16: YES), the control unit 21 accesses the storage unit 29a of the volume setting unit 29 and sets the first initial volume. The volume setting unit 29 is set (step S17), and the process is terminated.

  When the signal indicating that the first selection button 71c is pressed is not received from the remote operation device 33 (step S16: NO), the control unit 21 indicates that the second selection button 71d is pressed from the remote operation device 33. It is determined whether or not the indicated signal has been received (step S18). When the signal indicating that the second selection button 71d is pressed is not received from the remote operation device 33 (step S18: NO), the control unit 21 returns the process to step S16. When a signal indicating that the second selection button 71d has been pressed is received from the remote operation device 33 (step S18: YES), the control unit 21 sets the second initial volume in the volume setting unit 29 (step S19).

  The operation screen displayed in step S15 is not limited to the selection-type operation screen shown in FIG. For example, it may be an operation screen that displays a volume bar with an icon indicating a first initial volume or a second initial volume with a flag. In this case, the color, length, and the like of the volume bar change due to the operation of the remote operation device 33, and the volume changes. Further, step S12 may be omitted and the notification screen 72 may not be displayed.

  When the sound volume control device 20 receives a command for setting the sound volume related to the sound signal output from the output terminal 5 from the remote operation device 33 when the sound output device is connected to the output terminal 5, the sound volume control device 20 20 executes step S15 to step S19.

  In the volume control device 20 and the display device according to the embodiment, the volume corresponding to the audio output device connected to the output terminal 5 can be selected, and for example, a small volume is emitted compared to the monitor-out and the monitor-out. Even when the headphones to be used share the output terminal 5, since the excessive volume is not emitted from the headphones, the user can listen to the sound at a volume suitable for the audio output device connected to the output terminal 5. Can do.

  Also, one volume can be selected from a plurality of volumes corresponding to the audio output device connected to the output terminal 5. Therefore, even when the monitor out and the headphone that emits a small volume compared to the monitor out share the output terminal 5, an excessive volume is not emitted from the headphone and an excessive burden is applied to the eardrum of the user. Can be avoided. Further, the user can set the volume corresponding to the audio output device to be used via the operation screen 71, and can reliably set the desired volume.

  Also, a first initial volume output from an audio output device (such as headphones and earphones) worn on the ear and a second initial volume output from another audio output device are set to a predetermined value, for example, −36 [dBFS]. By making the following, it is possible to avoid applying an excessive load to the user's eardrum regardless of which of the audio output device worn on the ear and the other audio output device is connected to the output terminal.

  Further, by displaying the options on the display unit 4, the user can surely select the sound volume visually.

  In addition, when an audio output device is connected to the output terminal 5, the first initial volume or the second initial volume with the flag set is forcibly set, so that it is ensured that an excessive burden is placed on the user's eardrum. Can be avoided.

  Further, by notifying the user that the flagged first initial volume or second initial volume is set, the user is prompted to select a volume corresponding to the audio output device connected to the output terminal 5. be able to. For this reason, the user pays attention to the volume to be set, so that it is possible to reduce erroneous volume settings by the user.

  Further, when the flagged first initial volume or second initial volume is forcibly set, the notification screen 72 is displayed on the display unit 4, and the first initial volume or the second initial volume is forcibly set. Therefore, the user can surely understand the contents of the notification through vision.

  In addition, when a sound output device other than a sound output device (such as headphones and earphones) attached to the ear is connected to the output terminal 5, the sound is emitted from the sound output device regardless of the type of the other sound output device. The user who has listened to the perceived sound perceives that the sound volume is the same as that heard by the sound output device attached to his / her ear, and even if switching between one sound output device and another sound output device, The user does not feel uncomfortable before and after. Therefore, the user can listen to the voice comfortably.

  In addition, the volume control apparatus 20 and the display apparatus 1 which concern on embodiment described the case where two types of audio | voice output apparatuses share the output terminal 5, Therefore, the two initial volume is memorize | stored in the memory | storage part 29a. However, the present invention is not limited to this, and the initial volume of the number corresponding to the type of the audio output device connected to the output terminal 5 is stored in the storage unit 29a. Therefore, when three or more types of audio output devices share the output terminal 5, three or more initial volumes are stored in the storage unit 29a. Even in this case, when sound is output at a corresponding initial volume from a sound output device other than the sound output device attached to the ear, the sound output device other than the sound output device attached to the ear is attached to the ear. The audio is output at a volume perceived by the user as substantially the same volume as when the audio is output from the audio output device at the first initial volume.

  The volume control device 20 according to the embodiment is applied to the display device 1, but can also be applied to a portable music playback device, a mobile phone having a music playback function, a PDA (Personal Digital Assistant), and the like. Moreover, although the volume control apparatus 20 which concerns on embodiment has set the volume by the remote operation apparatus 33 and the operation screen 71, the means to receive the setting of a volume is not limited to this. For example, a volume setting switch may be provided, and the volume may be set by the switch.

  Note that the volume control device 20 according to the embodiment notifies the user that the first initial volume is forcibly set by displaying the notification screen 72, but the notification to the user is limited to this. Is not to be done. For example, a notification lamp may be provided and the lamp may be turned on, or a notification sound may be output from an internal speaker.

  The embodiment described above is an exemplification of the present invention, and the present invention can be implemented in variously modified forms within the scope defined by the claims.

DESCRIPTION OF SYMBOLS 1 Display apparatus 4 Display part 5 Output terminal 20 Volume control apparatus 24 Light-receiving part 29 Volume setting part (setting part)
29a storage unit 32 detection switch (detection means)
33 Remote control device (reception means)
51 First Audio Output Device 52 Second Audio Output Device 71 Operation Screen 72 Notification Screen

Claims (5)

An output terminal that outputs an audio signal; an accepting unit that accepts a volume related to the audio signal output from the output unit; and an audio signal that is output from the output terminal according to the volume received by the accepting unit In a volume control device comprising a setting unit for setting a volume,
A plurality of audio output devices share the output terminal,
A storage unit for storing a volume corresponding to each of the plurality of audio output devices;
The accepting means is adapted to accept any volume from the volumes stored in the storage unit,
The volume control device, wherein the setting unit is configured to set any volume received by the receiving unit. The plurality of audio output devices include one audio output device worn on the ear and another audio output device,
The plurality of volumes stored in the storage unit includes one volume corresponding to the one audio output device and another volume corresponding to the other audio output device,
A detection means for detecting that an audio output device is connected to the output terminal;
The said setting part is provided with a means to forcibly set the said one volume or another volume, when it is detected by the said detection means that the audio | voice output apparatus was connected. The sound volume control device described in 1.   The system further comprises an informing means for informing that the one sound volume or the other sound volume is forcibly set when it is detected that the sound output device is connected by the detecting means. The volume control apparatus according to 2. A volume control device according to claim 3 and a display unit for displaying an image.
The display device is configured to display on the display unit that the one volume or another volume is forcibly set. A volume control device according to any one of claims 1 to 3, and a display unit that displays an image,
The display unit is characterized in that an option for selecting any one of the volumes stored in the storage unit is displayed on the display unit.

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