JP2006099834A - Audio system, its control method and program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply store the sound level to output for each audio source, without requiring user's conscious operations. <P>SOLUTION: When the sound volume is adjusted on a switch panel 15 before a predetermined period has passed after the sound source had been switched, the audio control CPU 14 updates the reference sound level of the sound source and stores it to a RAM17. When switching a sound source the next time, the CPU 14 controls the electronic volume control IC 18 to set the sound level to the level reference to be set that has been stored in the RAM 17. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an audio device, a control method for the audio device, a control program, and a recording medium, and more particularly, to an audio device used for in-vehicle use, a control method therefor, a control program, and a recording medium.

Conventionally, a plurality of sound sources (audio sources) are connected to an in-vehicle audio device, and a volume level at the time of sound output is stored for each audio source, and playback is performed at the volume level stored when the audio source is switched. It is known (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-41837

However, in order to memorize the sound level at the time of sound output for each audio source, it is necessary for the user to give an instruction to do so and to consciously shift to the memory operation mode, and there is a problem that operability is poor. It was.
Accordingly, an object of the present invention is to provide an audio device, an audio device control method, and a control program that can easily store the sound level at the time of sound output for each audio source without causing the user to perform a conscious operation. And providing a recording medium.

In order to solve the above-described problem, an audio device that selects any one of a plurality of sound sources by switching, and performs sound output of the selected sound source, volume adjustment for the user to perform sound volume adjustment of the sound output A reference volume level storage unit that updates and stores a reference volume level of the sound source when the volume adjustment is made before a predetermined time has elapsed since the time of switching the sound source, and at the time of switching the sound source, And a volume control unit that sets the volume level of the sound source after switching to a reference volume level stored in the reference volume level storage unit.
According to the above configuration, the reference volume level storage unit updates and stores the reference volume level of the sound source when the volume adjustment is performed before the predetermined time elapses from when the sound source is switched in the volume adjustment unit.
Thereby, the volume adjustment unit sets the volume level of the sound source after switching to the reference volume level stored in the reference volume level storage unit when the sound source is switched.

In this case, a reference volume level of any one of the plurality of sound sources is set as a fixed specific reference volume level, and the reference volume level storage unit sets a difference volume level from the specific reference volume as the reference volume. You may make it update as a level.
Further, a display unit may be provided that displays a reference volume level to be stored in the reference volume level storage unit when the volume adjustment is performed before a predetermined time has elapsed since the switching of the sound source. .
Further, the reference volume level storage unit may store the sound output level after volume adjustment as the reference volume level.

In addition, a control method for controlling an audio device that selects one of a plurality of sound sources by switching and controls sound output of the selected sound source is volume adjustment for the user to adjust sound volume of the sound output. A reference volume level storing step of updating and storing a reference volume level of the sound source when the volume adjustment is made before a predetermined time has elapsed since the switching of the sound source;
A volume adjustment process for setting the volume level of the sound source after the switching to the reference volume level stored in the reference volume level storage process when the sound source is switched.

  In addition, a control program for selecting one of a plurality of sound sources by switching by a user and controlling the audio device that performs sound output of the selected sound sources by a computer is a predetermined time from when the sound sources are switched. When the volume is adjusted by the user before the update, the reference sound volume level of the sound source is updated and stored, and when the sound source is switched, the sound volume level of the sound source after the change is stored as the reference sound volume level. It is characterized by that.

In this case, a reference volume level of any one of the plurality of sound sources is set as a fixed specific reference volume level, and a difference volume level from the specific reference volume is updated as the reference volume level. Good.
The control programs may be recorded on a computer-readable recording medium.

  According to the present invention, it is possible to easily store the sound level at the time of sound output for each audio source without causing the user to perform a conscious operation.

Next, preferred embodiments of the present invention will be described with reference to the drawings.
[1] First Embodiment FIG. 1 is a schematic configuration block diagram of an in-vehicle audio system according to a first embodiment.
The in-vehicle audio system 1 includes a radio tuner 11 that receives radio waves and outputs a radio reproduction signal that is an analog audio signal, and a CD that reproduces a CD (Compact Disc) and outputs a CD reproduction signal that is an analog audio signal. A player 12 and an MD player 13 that reproduces an MD (Mini Disc; registered trademark) and outputs an MD reproduction signal that is an analog audio signal are provided.
The in-vehicle audio system 1 is configured as a microcomputer having RAM, ROM, etc., and the MPU is operated by a control program stored in the ROM in advance, and the audio control CPU 14 for controlling each part of the in-vehicle audio system 1 as described above is provided. I have.

The audio control CPU 14 is connected to a switch panel 15 provided with various operation keys. Various operations on the switch panel 15 performed by the user are input, and the audio control CPU 14 corresponds to the input key operations. Processing will be performed. The audio control CPU 14 is connected to a display unit 16 having a display device such as a liquid crystal display or an EL display and a display driver for controlling the display device. The display unit 16 is controlled by the audio control CPU 14. , Display various information such as operation status, playback song name, reception radio channel.
The audio control CPU 14 is connected to an external RAM 17 and stores various data.

  Further, the in-vehicle audio system 1 receives an analog audio signal, an electronic volume IC 18 that adjusts the volume under the control of the audio control CPU 14, and amplifies the analog audio signal after the volume adjustment by the electronic volume IC 18. A power amplifier 19 that outputs a signal and a speaker 20 that outputs sound based on the amplified analog audio signal are provided.

Here, the configuration of the electronic volume IC 18 will be described.
The electronic volume IC 18 includes a selector 18A that exclusively selects and outputs one of a plurality of input analog audio signals under the control of the audio control CPU 14. The analog audio signal selected by the selector 18A is amplified by the selector volume circuit 18B and output to the sound quality adjustment circuit 18C.
The analog audio signal whose sound quality has been adjusted in the sound quality adjusting circuit 18C is adjusted to the volume set in the switch panel 15 by the main volume circuit 18D and output to the power amplifier 19.
As a result, sound output is made from the speaker 20.

FIG. 2 is a front view of the front panel of the in-vehicle audio device constituting the in-vehicle audio system.
The in-vehicle audio device 1X includes at least an audio control CPU 14, a switch panel 15, a display unit 16, an external RAM 17, and an electronic volume IC 18 in the configuration of the in-vehicle audio system 1 described above. Note that the power amplifier 19 can also be provided.
At the center of the front panel of the in-vehicle audio device 1X, a display device 16A such as a liquid crystal display or an EL display that constitutes the display unit 16 described above is arranged, and the operation state, playback track number, playback song name, reception radio channel, and the like Various information is displayed.

On the left side of the display device of the display device 16A, there is provided a volume switch 30 for adjusting the volume by a rotating operation and operating a mute circuit (not shown) by a push operation to enter a mute state.
In the lower left direction of the volume switch 30, an adjustment switch 21 for performing a push operation to display an adjustment screen for performing various adjustments on the display device 16A is disposed. In addition, an operation mode switch 23 that switches the operation mode of the in-vehicle audio device by a push operation is disposed in the upper left direction of the volume switch 30.

  Further, on the right side of the display device 16A, the switch panel 15 is configured, and operation keys 22 for performing various inputs according to the operation mode are arranged. The operation key 22 includes a first operation key 22a, a second operation key 22b, and a third operation key 22c. These first to third operation keys 22a to 22c are seesaw type switches, and in this embodiment, the first operation key 22a, the second operation key 22b, and the third operation key 22c are upper or lower. Each preset function is realized by pressing.

Next, the operation will be described.
FIG. 2 is a processing flowchart of the embodiment.
In the following description, the analog audio signal from the CD player 12 is used as a reference for volume adjustment, and the volume adjustment of the analog audio signal from the CD player 12 is not performed except for the user volume adjustment. And In the initial state, an analog audio signal from the CD player 12 is reproduced.

  In the initial state, the CD reproduction signal output from the CD player 12 is input to the electronic volume IC 14 via the input resistor R2, and is input to the selector volume circuit 18B via the selector 18A. The selector volume circuit 18B outputs the volume of the CD reproduction signal to the sound quality adjustment circuit 18C as it is because it is not necessary to adjust the volume of the analog audio signal from the CD player 12. The sound quality adjustment circuit 18C adjusts the sound quality of the input analog audio signal and outputs it to the main volume circuit 18D, and finally adjusts the volume of the analog audio signal after the sound quality adjustment and outputs it to the power amplifier 19. As a result, the power amplifier 19 amplifies the input analog audio signal at a predetermined magnification, drives the speaker 20 to perform sound output, and the CD is reproduced (step S11).

In this state, when the user operates the switch panel 15 to change the input source of the analog audio signal (for example, change to the radio tuner 11), the input source of the changed analog audio signal (audio) Source) is displayed on the display unit 16 (step S12).
Specifically, as shown in the explanatory diagram of the display state in the initial state of FIG. 3, characters “AM” indicating that the AM radio is received in the radio tuner 11 are displayed on the display device 16 </ b> A. At the same time, the reference volume level adjustment level “ADJ 0” is displayed. Here, the adjustment level “ADJ 0” of the reference volume level indicates that the adjustment amount of the reference volume is 0 dB and no adjustment is performed.

FIG. 4 is an explanatory diagram of the storage state of the volume level adjustment storage table in the RAM.
In the initial state, as shown on the left side of FIG. 4, the volume level adjustment storage table 17A in the RAM 17 stores all audio sources, that is, CD, AM radio broadcast, AM radio traffic information broadcast, FM radio broadcast, MD It is stored that the adjustment amount of the reference volume of an audio source such as TV broadcast, VTR (video input), AUX (auxiliary input), etc. is 0 dB.
Next, the audio control CPU 14 determines whether or not the user has performed a volume operation on the volume switch 30 within 5 seconds (step S13).

Here, the reason for determining whether or not the user has performed a volume operation on the volume switch 30 within 5 seconds will be described.
When the audio source is changed, the volume differs for each audio source, so even if the volume of the audio source that was heard before the audio source was set optimally, the playback sound is too loud or too low. For example, the user may feel uncomfortable. Therefore, if the user performs a volume operation on the volume switch 30 within 5 seconds from the change of the audio source, it can be assumed that the reproduction sound after the change of the audio source is too loud or too small. it can. It can be determined that the reference volume level corresponding to the audio source after changing the audio source is inappropriate.

Therefore, if it is determined in step S13 that no volume operation has been performed in the volume switch 30 within 5 seconds after changing the audio source (step S13; No), the reference volume level corresponding to the changed audio source is determined. Is determined to be optimal (step S20), the process proceeds to normal operation (step S21), and the process proceeds to step S19.
On the other hand, if it is determined in step S13 that the volume switch 30 is operated within 5 seconds after changing the audio source (step S13; Yes), it is determined that the reference volume level corresponding to the changed audio source is inappropriate. Then, the main volume 18D does not adjust according to the operation state of the volume, adjusts the amplification factor of the selector volume circuit 18B, changes the reference volume level, and stores the changed state in the RAM volume level adjustment memory. The information is stored in the table and displayed on the display unit 16 (step S15).

Specifically, as shown in FIG. 5, the display device 16 </ b> A displays characters “AM” indicating that the AM radio is received in the radio tuner 11, and adjusts the reference volume level. “ADJ + 2.0” is displayed. Here, the adjustment level “ADJ + 2.0” of the reference volume level indicates that the adjustment amount of the reference volume is +2.0 dB, and the reproduction volume is adjusted to be increased by 2.0 dB. Yes.
Then, the contents of the RAM volume level adjustment storage table are changed from 0 dB to +2.0 dB and stored as shown on the right side of FIG.

Next, the audio control CPU 14 determines whether or not the user has performed the volume operation again within 5 seconds after the volume operation (step S16).
If it is determined in step S16 that the volume operation has not been performed again within 5 seconds after the volume operation (step S16; No), the reference volume level after the volume operation corresponding to the audio source being played back is optimal. Is determined (step S17), and the process proceeds to a normal operation (step S18).
Then, it is determined whether or not the audio source has been changed to a CD (step S19). If the audio source has been changed to a CD (step S19; CD), the process proceeds to step S11 again to reproduce the CD. Thereafter, the same processing is performed.

If it is determined in step S19 that the audio source is changed to other than CD (step S19; other than CD), the process proceeds to step S12, and the same process is performed thereafter.
On the other hand, if it is determined in step S16 that the volume operation is performed again within 5 seconds after the volume operation (step S13; Yes), it is determined that the reference volume level corresponding to the changed audio source is inappropriate, and the volume The volume level is changed by adjusting the amplification factor of the selector volume circuit 18B without adjusting the main volume in accordance with the operation state, and the changed state is stored and displayed in the volume level adjustment storage table of the RAM. This is displayed on the part 16 (step S15). Thereafter, the same processing is performed.
As described above, according to the first embodiment, the reference volume level can be set in an optimum state without making the user aware of the change in the reference volume level. Playback can be performed at the user's favorite volume without bothering the user sometimes.

As a result, the number of volume operations performed by the user is reduced, and in the in-vehicle audio apparatus, the user can concentrate on driving operations.
The above explanation is for switching the audio source to AM radio broadcasting during CD playback. However, devices that are attached later such as volume level differences caused by differences in reception status by region, VTR input / AUX input, etc. The reference sound volume level can be set to an optimum state without making the user aware of the operation.

[2] Second Embodiment FIG. 6 is a schematic configuration block diagram of an in-vehicle audio system according to a second embodiment. The difference from the first embodiment of FIG. 1 is that the audio signals output from the CD player 12 and the MD player 13 are digital audio signals, and an audio digital signal processor (audio DSP) 35 is provided instead of the electronic volume IC 18. is there.

Hereinafter, different points will be mainly described.
The in-vehicle audio system 1A receives a radio wave and outputs a radio playback signal that is an analog audio signal and a radio tuner 11 that reproduces a CD (Compact Disc) and outputs a CD playback signal that is a digital audio signal. A player 12 and an MD player 13 that reproduces MD and outputs an MD reproduction signal that is a digital audio signal are provided.
Furthermore, the in-vehicle audio system 1A receives an analog audio signal and a digital audio signal, and amplifies the audio DSP 35 that adjusts the volume under the control of the audio control CPU 14 and the analog audio signal that has been adjusted by the audio DSP 35. A power amplifier 19 that outputs as an analog audio signal and a speaker 20 that outputs sound based on the amplified analog audio signal are provided.

Here, the configuration of the audio DSP 35 will be described.
The audio DSP 35 includes an analog / digital converter (ADC) 35A that converts an analog audio signal input from the radio tuner into an analog-digital signal and outputs the digital audio signal. In addition, a sampling rate converter (SRC) 35B is provided which converts a digital audio signal input from the CD player 12 or the MD player 13 into a predetermined sampling frequency (for example, 48 kFs) and outputs the converted signal.
The digital audio signal output from the ADC 35A or SRC 35B is exclusively selected by the selector 35C under the control of the audio control CPU 14 and input to the gain adjustment circuit 35D.

The digital audio signal whose gain has been adjusted by the gain adjustment circuit 35D is adjusted in sound quality by the sound quality adjustment circuit 35E, is output to the main volume circuit 35F, and is adjusted to the volume set in the switch panel 15.
The volume-adjusted digital audio signal is output to the power amplifier 19 as an analog audio signal by a digital / analog converter (DAC) 35G.
As a result, sound output is made from the speaker 20.

Next, the operation of the second embodiment will be described with reference to the process flowchart of FIG. 2 again.
In the following description, the digital audio signal from the CD player 12 is used as a reference for volume adjustment, and the volume adjustment of the digital audio signal from the CD player 12 is not performed except for the user volume adjustment. And In the initial state, it is assumed that the digital audio signal from the CD player 12 is being reproduced.
In the initial state, the CD playback signal output from the CD player 12 is input to the selector 35C via the SRC 35B of the audio DSP 35 and output to the gain adjustment circuit 35D.

The gain adjustment circuit 35D outputs the digital audio signal from the CD player 12 to the sound quality adjustment circuit 35E while keeping the volume of the CD reproduction signal as it is not necessary to adjust the volume. The sound quality adjustment circuit 35E adjusts the sound quality of the input digital sound signal and outputs it to the main volume 35F, and finally adjusts the sound volume of the digital sound signal after the sound quality adjustment.
The volume-adjusted digital audio signal is digital / analog converted in the DAC 35G and output to the power amplifier 19 as an analog audio signal. As a result, the power amplifier amplifies the input analog audio signal at a predetermined magnification, drives the speaker 20 to perform sound output, and the CD is reproduced (step S11).

  In this state, if the user operates the switch panel 15 to change the input source of the audio signal (for example, change to the radio tuner 11), the input source of the changed audio signal (audio source) Is displayed on the display unit 16 (step S12).

Next, the audio control CPU 14 determines whether or not the user has performed a volume operation on the volume switch 30 within 5 seconds (step S13).
If it is determined in step S13 that no volume operation has been performed on the volume switch 30 within 5 seconds after changing the audio source (step S13; No), the reference volume level corresponding to the changed audio source is optimal. (Step S20), the process proceeds to a normal operation (step S21), and the process proceeds to step S19.

  On the other hand, if it is determined in step S13 that the volume switch 30 is operated within 5 seconds after changing the audio source (step S13; Yes), it is determined that the reference volume level corresponding to the changed audio source is inappropriate. The gain adjustment circuit 35D does not adjust the main volume 35F according to the operation state of the volume switch 30, and the gain adjustment circuit 35D increases the gain of the digital audio signal corresponding to the radio tuner 11 input via the ADC 35A and the selector 35C. Adjustment is performed, the reference volume level is changed, and the changed state is stored in the volume level adjustment storage table 17A of the RAM 17 and displayed on the display unit 16 (step S15).

Next, the audio control CPU 14 determines whether or not the user has operated the volume switch 30 within 5 seconds again after the volume operation (step S16).
If it is determined in step S16 that the volume switch 30 has not been operated again within 5 seconds after the operation of the volume switch 30 (step S16; No), after the volume operation corresponding to the audio source being reproduced is performed. Is determined to be optimal (step S17), and the routine proceeds to normal operation (step S18).

Then, it is determined whether or not the audio source has been changed to a CD (step S19). If the audio source has been changed to a CD (step S; CD), the process proceeds to step S11 again to reproduce the CD. Thereafter, the same processing is performed.
If it is determined in step S19 that the audio source is changed to other than CD (step S; other than CD), the process proceeds to step S12, and the same process is performed thereafter.

  On the other hand, if it is determined in step S16 that the volume switch 30 is operated again within 5 seconds after the volume operation (step S13; Yes), it is determined that the reference volume level corresponding to the changed audio source is inappropriate. Thus, without adjusting the main volume, the volume level is changed by adjusting the gain of the gain adjustment circuit 35D without adjusting the main volume, and the changed state is stored in the volume level adjustment storage table 17A of the RAM 17. And display on the display unit 16 (step S15). Thereafter, the same processing is performed.

As described above, also in the second embodiment, the reference volume level can be set to an optimum state without making the user aware of the change in the reference volume level. Playback can be performed at the user's preferred volume without bothering the user.
As a result, the number of volume operations performed by the user is reduced, and in the in-vehicle audio apparatus, the user can concentrate on driving operations.

[3] Modification of Embodiment [3.1] First Modification In the above description, the reference volume is set by a volume adjustment circuit different from the main volume circuits 18D and 35F, such as the selector volume circuit 18B or the gain adjustment circuit 35D. Although the adjustment configuration is adopted, the same operation can be performed only by the main volume circuits 18D and 35F.
In this case, the user adjusts the set values (volume step number, attenuation amount, etc.) of the main volume circuits 18D and 35F within a predetermined time (5 seconds in the above example) after changing the audio source. In this case, a configuration may be adopted in which it is determined that there is a sense of incongruity in volume level adjustment between audio sources to be reproduced, and the adjusted volume setting value is stored.

Specifically, when playing a CD, the audio source is changed to AM radio broadcasting from the state where the volume step number is 15 steps (corresponding to −50 dB in attenuation display), and the user changes the audio source, It is assumed that an operation for raising the volume is performed within a predetermined time (for example, 5 seconds), and the adjustment is performed so that the number of volume steps = 19 (corresponding to −48 dB in attenuation display).
In this case, as the volume setting value when the audio source is changed to AM radio broadcasting, the number of volume steps = 19 (corresponding to −48 dB in attenuation amount display) is stored as a reference volume level in the RAM.

Thereafter, when the audio source is changed to CD again, the number of volume steps is returned to 15 steps (corresponding to −50 dB in attenuation display), and thereafter, the audio source is changed to AM radio broadcasting. Uses the number of volume steps = 19 (equivalent to −48 dB in attenuation display) as the reference volume level.
Furthermore, when this method is adopted, if the user adjusts the volume after a predetermined time (5 seconds in the above example) has elapsed since the audio source was changed, playback continues at the adjusted volume. The value is not stored in the RAM as a reference volume level.
In this case, it is desirable that the volume volume is finely adjusted. For example, a comfortable volume level adjustment can be performed by setting the adjustment capacity to about 0.5 dB per step.

[3.2] Second Modification In the above description, the case where AM radio broadcast reproduction is performed from CD reproduction has been described as an example. However, instead of reception of a normal AM radio broadcast station, AM radio traffic information (frequency It can also be applied to the case of shifting to reception of 1629 kHz).
This is because broadcasting of AM radio traffic information (frequency 1629 kHz) is shallowly modulated, the volume is often low, and volume operations are often required.

Also, for television broadcasts, there is a difference in volume level depending on the reception state of the broadcast station, so that if the volume level is adjusted at a broadcast station in a region where viewers frequently watch, a subsequent readjustment is unnecessary.
Furthermore, even when an external device such as a video tape recorder is connected and switched to an audio source such as a VTR or AUX, the same reference processing is performed at the initial connection, so that the subsequent reference volume level is optimized. This eliminates the need to adjust the volume each time the audio source is changed.

[3.3] Third Modification In the above description, the predetermined time for changing the reference volume is set to 5 seconds, but can be set as appropriate. It is also possible for the user to set an arbitrary time.

[3.4] Fourth Modification In the above description, the in-vehicle audio system has been described as an example. However, the present invention is not limited to this, and is not limited to this. A stationary audio device, a mobile phone with an audio playback function, a PDA, a PHS, It can also be configured to be incorporated in a portable electronic device such as a portable personal computer.

[3.5] Fifth Modification In the above description, the case where the control program for the in-vehicle audio system is stored in the ROM has been described. However, the control program is stored in a recording medium such as various magnetic disks, optical disks, and memory cards. Can be recorded in advance, read from these recording media, and installed. It is also possible to provide a communication interface and download the control program via a network such as the Internet or LAN, and install and execute the program.

1 is a schematic configuration block diagram of an in-vehicle audio system of a first embodiment. It is a front view of the front panel of the vehicle-mounted audio apparatus which comprises a vehicle-mounted audio system. It is explanatory drawing of the display state in an initial state. It is explanatory drawing of the memory | storage state of the memory | storage table for volume level adjustments in RAM. It is explanatory drawing of the display state after a volume level change. FIG. 6 is a schematic configuration block diagram of the in-vehicle audio system of the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Car audio system 1X ... Front panel 11 ... Radio tuner 12 ... CD player 13 ... MD player 14 ... Audio control CPU (volume control part)
15 ... Switch panel (volume control section)
16 ... Display unit 16A ... Display device 17 ... RAM (reference volume level storage unit)
17A ... Volume level adjustment storage table (reference volume level storage section)
18 ... Electronic volume IC (volume control unit)
18A ... selector 18B ... selector volume circuit 18C ... sound quality adjustment circuit 18D ... main volume circuit 20 ... speaker 30 ... volume switch 35 ... audio DSP (volume control unit)
35A: Analog / digital converter (ADC)
35B ... Sampling rate converter (SRC)
35C ... Selector 35D ... Gain adjustment circuit 35E ... Sound quality adjustment circuit 35F ... Main volume circuit 35G ... Digital / analog converter (DAC)

Claims (8)

In an audio device that selects one of a plurality of sound sources by switching by a user and performs sound output of the selected sound source,
A volume adjustment unit for the user to adjust the volume of the sound output; and
A reference volume level storage unit that updates and stores a reference volume level of the sound source when the volume adjustment is made before a predetermined time has elapsed since the switching of the sound source;
A volume control unit that sets the volume level of the sound source after the switching to the reference volume level stored in the reference volume level storage unit when the sound source is switched;
An audio apparatus comprising: The audio device according to claim 1.
The reference volume level of any one of the plurality of sound sources is a fixed specific reference volume level,
The reference volume level storage unit updates a difference volume level with the specific reference volume as the reference volume level;
An audio device characterized by that. The audio device according to claim 1 or 2,
An audio comprising: a display unit for displaying a reference volume level to be stored in the reference volume level storage unit when the volume adjustment is made before a predetermined time has elapsed since the switching of the sound source. apparatus. The audio device according to claim 1.
The reference volume level storage unit stores a sound output level after volume adjustment as the reference volume level.
An audio device characterized by that. In a control method for controlling an audio device that selects one of a plurality of sound sources by switching by a user and performs sound output of the selected sound source,
A volume adjustment process for the user to adjust the volume of the sound output; and
A reference volume level storage process of updating and storing a reference volume level of the sound source when the volume adjustment is made before a predetermined time has elapsed since the switching of the sound source;
When the sound source is switched, a volume adjustment process that sets the volume level of the sound source after the switching to the reference volume level stored in the reference volume level storage process;
A method for controlling an audio device comprising: In a control program for controlling by a computer an audio device that selects one of a plurality of sound sources by switching by a user and performs sound output of the selected sound source,
If the volume is adjusted by the user before a predetermined time has elapsed since the switching of the sound source, the reference volume level of the sound source is updated and stored,
When switching the sound source, let the volume level of the sound source after switching be a reference volume level stored.
A control program characterized by that. The control program according to claim 6,
The reference volume level of any one of the plurality of sound sources is a fixed specific reference volume level,
Updating a difference volume level with the specific reference volume as the reference volume level;
A control program characterized by that. 8. A computer-readable recording medium on which the control program according to claim 6 or 7 is recorded.

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