JP2007174349A - Audio device and method for changing over output - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a cost while maintaining the function of an existing system in an audio device. <P>SOLUTION: The audio device has an output terminal 31 combined for the output of a first sound signal and the output of a second sound signal having a normal level higher than the output of the first sound signal. In the audio device, a use setting means 30 setting whether or not the output terminal is used for either use for the output of the first sound signal or the output of the second sound signal in response to an indication is fitted. In the audio device, the initial-level setting means 30 setting an output level from an initial output terminal after the change of the setting of the use for the output terminal at a specified low level when the setting of the use for the output terminal is changed from the use for the output of the first sound signal to the use for the output of the second sound signal is fitted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an audio apparatus including an output terminal that is also used for outputting a first audio signal and a second audio signal having a higher level than that of the first audio signal, and an output switching method suitable for the audio device.

  FIG. 7 is a block diagram showing a configuration example of a conventional audio system having a video function and a video output function. When audio signals and video signals are output from the audio and video sources 11 to 14, the audio signals are input to the audio selector 15 via inputs 1 to 4, and the video signals are input to the video selector 16. 1 to 4 are input. The audio signal input to the audio selector 15 is output via outputs 1 to 4 in accordance with the connection relationship between inputs 1 to 4 and outputs 1 to 4. The video signal input to the video selector 16 is output via outputs 1 and 2 according to the connection relationship between inputs 1 to 4 and outputs 1 and 2.

  The level of the audio signals output from the outputs 1 to 3 of the audio selector 15 is adjusted by the electronic volumes 17 to 19, respectively. This level adjustment is performed based on an adjustment value of a volume provided in the main body of the system. The output of the electronic volume 17 is supplied to the speaker 22 through the amplifier 20 and is output to the outside through the front pre-out 24. The output of the electronic volume 18 is supplied to the speaker 23 via the amplifier 21 and supplied to the outside via the front pre-out 25. The output of the electronic volume 19 is supplied to the outside via the subwoofer pre-out 26.

  The audio signal output from the output 4 of the audio selector 15 is supplied to the outside through the AV output terminal 27. Video signals output from the outputs 1 and 2 of the video selector 16 are supplied to the outside via AV output terminals 28 and 29, respectively. At this time, for the audio signal portions of the AV output terminals 27 to 29, the output from the output 4 of the audio selector 15 is supplied to the outside via the AV output terminal 27 as it is without being linked to the volume. The audio selector 15, the video selector 16, and the electronic volumes 17 to 19 are controlled by the microcomputer 30.

  Each of the audio selector 15 and the video selector 16 includes a plurality of outputs, and inputs 1 to 4 can be independently selected and connected to each output. Therefore, for example, reproduction based on the audio signal from the tuner 11 is performed by the subwoofer connected to the front speaker 22, the rear speaker 23, and the output terminal 26, and the audio signal from the DVD player 12 is output via the AV output terminals 27 to 29. In addition, simultaneous playback based on a plurality of sources 11 to 14 can be performed, such as playback based on video signals.

  As a technique related to such an audio system, Patent Document 1 discloses that video data and audio data are output in a format set at that time for data from a previously connected receiver. For data from a receiver that has never been connected, a video / audio output device is described that outputs video data and audio data in a format set via a format setting screen.

  Patent Document 2 records the audio signal input from the audio input / output terminal so that the audio signal input from the audio input / output terminal can be output from the video input / output terminal in the after-recording mode. In this case, a recording apparatus is described in which an audio signal can be monitored faithfully by an external monitor.

  Japanese Patent Application Laid-Open No. 2004-228688 includes a plurality of connection means for connecting the navigation device and other external devices, and an in-vehicle AV monitor device that outputs video signals and audio signals sent from the navigation device and other external devices. Describes an in-vehicle AV monitor device that can switch the video signal of another external device to the video signal of the navigation device while maintaining the output state of the audio signal of the external device.

JP 2005-175570 A JP 2000-92432 A JP-A-8-331467

  However, according to the prior art of FIG. 7 described above, since there are many output systems and it is necessary to mount an IC or circuit having a large number of pre-out output terminals and selectors, it is positioned at a lower level in the price range in terms of cost. It is difficult to accommodate the model. That is, it is difficult to realize the functions of the current system at low cost, and the AV output function and the pre-out function must be deleted in order to realize a low-cost model.

  An object of the present invention is to reduce the cost while maintaining the functions of the current system in an audio system in view of the problems of the prior art.

  In order to achieve the above object, an audio device according to a first aspect of the present invention includes an output terminal that is also used for outputting a first audio signal and a second audio signal having a higher level than that of the first audio signal; Accordingly, application setting means for setting whether the output terminal is used for the output of the first audio signal or the output of the second audio signal, and the setting of the use of the output terminal is for the output of the first audio signal And an initial level setting means for setting the output level from the initial output terminal after the change to a predetermined low level when changed to output the second audio signal. As the initial level setting means, for example, an electronic volume for adjusting the level of the second audio signal and a means for controlling the electronic volume are applicable.

  In this configuration, when the setting of the use of the output terminal is changed from the output of the first audio signal to the output of the second audio signal according to the instruction, the output level from the initial output terminal after switching is a predetermined level. Set to low level. Therefore, even when a speaker corresponding to the output of the first audio signal is connected to the output terminal at the time of this switching, the explosion sound is generated by the second audio signal having a normal level higher than that of the first audio signal. Can be prevented. Therefore, the connection terminal can be used for outputting the first audio signal and the second audio signal without any trouble. Therefore, the cost can be reduced while maintaining the current function without any trouble.

  The audio device according to a second invention is the audio device according to the second invention, wherein the predetermined low level is not harsh with the sound reproduced by the device for the first audio signal based on the output of the second audio signal from the output terminal. Such a level is the lowest level that can be set.

  The audio device according to a third aspect of the present invention is the audio device according to the first or second aspect, wherein the output level of the second audio signal output from the output terminal when the use of the output terminal is set to output the second audio signal. Is provided with a level adjusting means for adjusting the output level based on an instruction, and the initial level setting means sets the initial output level by controlling the level adjusting means. For example, an electronic volume corresponds to the level adjusting means.

  According to a fourth aspect of the present invention, there is provided an audio device according to the first or second aspect, wherein the first and second audio signals are provided on a common path for the first audio signal and the second audio signal, and level adjusting means for adjusting both output levels; The first volume operating means and the second volume operating means that are respectively operated to indicate the volume adjustment value and the second volume adjustment value, and the usage of the output terminal are set for outputting the first audio signal. If the output terminal is set to output the second audio signal, the level adjusting means is controlled based on the second volume adjustment value. And an initial level setting means for setting the initial output level by controlling the level adjusting means.

  An audio device according to a fifth invention is characterized in that, in any one of the first to fourth inventions, the first audio signal is an audio signal for a subwoofer, and the second audio signal is an audio signal at an AV output. And

  According to a sixth aspect of the present invention, in any one of the first to fourth aspects, the first audio signal is a rear speaker audio signal and a subwoofer audio signal, and the second audio signal is an AV output. It is an audio signal, and the application setting means uses the output terminal for either an output of an audio signal for a rear speaker, an output of an audio signal for a subwoofer, or an output of a second audio signal according to an instruction. It is characterized by setting whether to do.

  An output switching method according to a seventh aspect of the present invention is an output switching method in an audio device having an output terminal that is also used for outputting a first audio signal and outputting a second audio signal having a higher level than that of the first audio signal. The audio device sets whether the output terminal is used for outputting the first audio signal or the second audio signal according to the instruction, and the audio device is connected to the output terminal. And setting the output level from the output terminal at the initial stage after the change to a predetermined low level when the use setting is changed from the output of the first audio signal to the output of the second audio signal. It is characterized by that.

  According to the present invention, when the setting of the use of the output terminal is changed from the output of the first audio signal to the output of the second audio signal, the output level from the initial output terminal after the change is changed to a predetermined low level. Therefore, even when a speaker corresponding to the output of the first audio signal is connected to the output terminal when the application is changed, the second audio signal having a higher level than the first audio signal is used. It is possible to prevent the explosion from occurring. Therefore, the connection terminal can be used for the output of the first audio signal and the second audio signal without any trouble, and the cost can be reduced while maintaining the current function.

  FIG. 1 is a block diagram showing the configuration of an audio system according to an embodiment of the present invention. In this system, a pre-out output function and an AV output function are realized by one output terminal. In the figure, 11 to 14 are tuners, DVD players, TVs, and AV inputs which are audio and video sources, and 15 is an audio signal from the sources 11 to 14 connected to four input terminals (inputs 1 to 4), respectively. And an audio selector 16 having three output terminals (outputs 1 to 3). A video signal 16 from the sources 11 to 14 is connected to four input terminals (inputs 1 to 4), respectively, and two output terminals (output 1). And 2). The voice selector 15 can select and connect the inputs 1 to 4 independently to the outputs 1 to 3. The video selector 16 can assign inputs 1 to 4 to the outputs 1 and 2 independently.

  Reference numerals 17 to 19 are electronic volumes connected to the outputs 1 to 3 of the audio selector 15, 20 and 21 are amplifiers connected to the electronic volumes 17 and 18, respectively, 22 is a front speaker connected to the amplifier 20, and 23 is an amplifier. 21 is a rear speaker connected to the output side of the electronic volume 17, 25 is a re-appliout terminal connected to the output side of the electronic volume 18, and 31 is a subwoofer connected to the electronic volume 19. Pre-out and AV output terminals, 28 and 29 are AV output terminals connected to outputs 1 and 2 of the video selector 16, respectively, and 30 is an audio selector 15, video selector 16 and electronic volumes 17 to 19 based on user instructions. It is the microcomputer which controls. The subwoofer pre-out / AV output terminal 31 is shared by the audio line for AV output and the output line for subwoofer.

  FIG. 2 is a front view of the main body of the audio system of FIG. In the figure, 32 is a rotary encoder for normal volume control, 33 is a rotary encoder for setting the output level when performing AV output from the output terminal 31, and 34 is an output 3 of the audio selector 15 (FIG. 1). A switching button for switching between a mode used as an output for a subwoofer (hereinafter referred to as “subwoofer pre-out mode”) or a mode used as an AV output (hereinafter referred to as “AV output mode”); Reference numeral 35 denotes a display for displaying information necessary for operation.

  In this configuration, when audio signals or video signals are output from the sources 11 to 14, the audio signals are input to the audio selector 15 via inputs 1 to 4, and the video signals are input to the video selector 16. 1 to 4 are input. The selected audio signal input to the audio selector 15 is output from outputs 1 to 3. The selected video signal input to the video selector 16 is output from outputs 1 and 2. The level of the audio signals output from the outputs 1 to 3 of the audio selector 15 is adjusted by the electronic volumes 17 to 19, respectively.

  In the subwoofer pre-out mode, the level adjustment by the electronic volumes 17 to 19 is performed based on the volume setting value given from the microcomputer 30 according to the volume adjustment value in the rotary encoder 32. On the other hand, in the AV output mode, the level adjustment by the electronic volumes 17 and 18 is performed based on the volume setting value given from the microcomputer 30 according to the volume adjustment value in the rotary encoder 32. Level adjustment by the electronic volume 19 is performed based on a volume setting value given from the microcomputer 30 in accordance with a volume adjustment value in the rotary encoder 32.

  The output of the electronic volume 17 is amplified by the amplifier 20 and supplied to the speaker 22 and is also output to the outside via the front pre-out 24. The output of the electronic volume 18 is amplified by the amplifier 21 and supplied to the speaker 23 and also supplied to the outside via the front pre-out 25. The output of the electronic volume 19 is supplied to the outside via the subwoofer pre-out / AV output terminal 31. Video signals from the outputs 1 and 2 of the video selector 16 are supplied to the outside via AV output terminals 28 and 29, respectively.

  According to this, each of the audio selector 15 and the video selector 16 includes a plurality of output systems, and inputs 1 to 4 can be independently selected and connected to the respective outputs. Therefore, for example, in the AV output mode, reproduction based on the audio signal from the tuner 11 is performed by the front speaker 22 and the rear speaker 23, and the audio signal and the video signal from the DVD player 12 are output by the output terminals 31, 28, and 29. Thus, simultaneous playback based on a plurality of sources can be performed.

  During this time, the microcomputer 30 performs different control on the electronic volume 19 depending on whether the subwoofer pre-out mode or the AV output mode is selected by the switching button 34.

  FIG. 3 shows the processing of the microcomputer 30 when the subwoofer pre-out mode is selected by the switching button 34. In the subwoofer pre-out mode, it is assumed that a subwoofer is connected to the output terminal 31. Therefore, the microcomputer 30 invalidates the volume adjustment value for the rotary encoder 33, and sets the default value to −20 [dB]. In this case, for example, if the setting value of the electronic volume corresponding to the volume adjustment value of the rotary encoder 32 is −25 [dB], the microcomputer 30 ignores the setting value by the rotary encoder 33 and sets by the rotary encoder 32. A value of −25 [dB] is set in the electronic volume 19.

  FIG. 4 shows the processing of the microcomputer 30 when the AV output mode is selected by the switching button 34. In the AV output mode, the output terminal 31 is assumed to be used for outputting an audio signal in the AV output. Accordingly, for example, if the setting value of the electronic volume by the rotary encoder 32 is −25 [dB] and the setting value by the rotary encoder 33 is −10 [dB], the microcomputer 30 sets the setting by the rotary encoder 32. The value is ignored and -10 [dB], which is the set value by the rotary encoder 33, is set in the electronic volume 19.

  That is, when switching from the subwoofer pre-out mode to the AV output mode by the switching button 34, the microcomputer 30 first sets the default setting value −20 [dB] by the rotary encoder 33 regardless of the volume adjustment value by the rotary encoder 32. The electronic volume 19 is set, and the output level from the output 3 of the audio selector 15 is set to a low value. Thereafter, when the rotary encoder 33 is operated, the microcomputer 30 sets a setting value corresponding to the volume adjustment value corresponding to the operation amount in the electronic volume 19. That is, the microcomputer 30 determines the set value for the electronic volume 19 based on the volume adjustment value by the rotary encoder 33 without being linked to the operation of the rotary encoder 32. Therefore, the user can arbitrarily adjust the level of the audio signal output to the device by operating the rotary encoder 32 while monitoring with the device connected to the output terminal 31.

  According to this, the output terminal 31 can be used as both a terminal for output to the subwoofer and a terminal for AV output without causing an explosion sound due to an erroneous operation. That is, regarding the output from the output 3 of the audio selector 15, when the AV output mode is selected by the switching button 33, according to the conventional example, the level of the audio signal of the AV output is not linked to the volume. Therefore, it is fixed regardless of the operation of the rotary encoder 32. However, simply doing so, for example, if the user connects the subwoofer to the output terminal 31, and the switch button 33 accidentally switches from the subwoofer preout mode to the AV output mode, an explosion sound is output from the subwoofer. There is a risk. This is because the level of the audio signal of the AV output usually corresponds to a considerably larger value in the volume setting value.

  In this regard, according to the present embodiment, the rotary encoder 33 that can adjust only the volume level in the AV output only when the AV output mode is switched by the switching button 34 is provided, and the set value of the electronic volume 19 is set as follows. At the same time as switching to the AV output mode, the volume level of the AV output is set to a level that is not harsh for hearing, and then the rotary encoder 33 is set to an optimum volume for the device connected to the output terminal 31. If the subwoofer is connected to the output terminal 31 and the subbutton is accidentally switched from the subwoofer pre-out mode to the AV output mode when the subwoofer is connected to the output terminal 31, the explosion sound from the subwoofer Can be prevented.

  FIG. 5 is a block diagram showing the configuration of an audio system according to another embodiment of the present invention. In the figure, 51 is a DVD player, 52 is an audio IC to which audio signals are input from the DVD player 51 and a tuner or disc changer, 53 and 54 are amplifiers connected to the output side of the audio IC 52, and 55 is an amplifier 53. The connected front speaker, 56 is a rear speaker connected to the amplifier 54, 57 is a front pre-out connected to the input side of the amplifier 53, 58 is a re-appli out connected to the input side of the amplifier 54, and 59 is also a subwoofer pre-out. An AV output terminal 60 is an AV output terminal connected to the video output in the AV output of the DVD player 51. The audio IC 52 has a plurality of outputs as described above, and has a selector function for setting the output destination of the input audio signal in accordance with a user instruction and a volume function for adjusting the volume level of each audio signal. Yes. The subwoofer pre-out / AV output terminal 59 is also used for outputting to the subwoofer and for outputting an audio signal in the AV output.

  In this system, a mode for using the output terminal 59 for output to the subwoofer (hereinafter referred to as “subwoofer pre-out mode”) or a mode for use for AV output (hereinafter referred to as “AV output mode”) is selected. , Is supposed to be done through the menu. That is, by selecting the item “SW PRE” (switching to pre-out) in a predetermined menu display, the sub-woofer pre-out mode or AV output mode is selected, and in this menu mode, “SubWoofer” and “ By selecting “SubWoofer” among the items of “AV-OUT”, it is possible to shift to the subwoofer pre-out mode, and by selecting “AV-OUT”, it is possible to shift to the AV output mode.

  In the AV output mode, the output level of the output terminal 59 can be set by selecting an item “AV-OUT output level setting” in a predetermined audio setup menu. However, the default value when switched to the AV output mode is set to the lowest value. That is, when the subwoofer pre-out mode is entered and the AV output mode is canceled, the set value of the output level of the output terminal 59 in the AV output mode is returned to the default value. In the AV output mode, items for performing settings related to the low-pass filter of the subwoofer in the audio setup menu cannot be selected. In the AV output mode, the selection items related to the two zones cannot be selected.

  In this configuration, in the AV output mode, the audio IC 52 outputs the audio signal from the DVD player 51 from the output terminal 59 and the video signal from the DVD player 51 from the output terminal 60 regardless of the state of the current source. . The same applies when the source is in the standby state. In the AV output mode, subwoofer pre-out output cannot be performed. In this case, the audio IC 52 accepts the selection of the item “AV-OUT output level setting” in the audio setup menu, and subsequently the setting of the output level of the audio signal in the AV output, based on the accepted setting value. , The output level from the output terminal 59 is set.

  In the subwoofer pre-out mode, it is assumed that a subwoofer is connected to the output terminal 59, and the audio IC 52 sets the output level from the output terminal 59 based on the set value set by the rotary encoder. Thereafter, when the AV output mode is selected, the output level from the output terminal 59 is set to the default value of the output level from the output terminal 59 in the AV output mode.

  According to the present embodiment, when the AV output mode is switched, the output level from the output terminal 59 is set to the lowest value, so that, as in the embodiment of FIG. The output terminal 59 can be used both for output to the subwoofer and for outputting the audio signal in the AV output without fear of the occurrence.

  FIG. 6 is a block diagram showing a configuration of an audio system according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 5 denote the same elements as in FIG. Reference numeral 61 denotes an output terminal connected to the output side of the audio IC 52, which is shared for audio output in re-applied out, subwoofer pre-out, and AV output. Reference numeral 62 denotes another AV output terminal connected to the video output in the AV output of the DVD player 51.

  In this system, a mode in which the output terminal 61 is used for pre-out output of a rear speaker (hereinafter referred to as “reappli out mode”) and a mode in which it is used for output to a subwoofer (hereinafter referred to as “subwoofer preout mode”). ) Or a mode used for AV output (hereinafter referred to as “AV output mode”) is selected via a menu. That is, by selecting the item “SW PRE” (switching to pre-out) in a predetermined menu display, the mode shifts to the menu mode for selecting the re-applied out mode, subwoofer pre-out mode or AV output mode. ”,“ SubWoofer ”, and“ AV-OUT ”, the“ rear ”is selected by selecting“ Rear ”, the subwoofer pre-out mode is selected by selecting“ SubWoofer ”, and“ AV-OUT ” By selecting “”, it is possible to shift to the AV output mode.

  In the AV output mode, the output level of the output terminal 61 can be set by selecting an item “AV-OUT output level setting” in a predetermined audio setup menu. However, the default value when switched to the AV output mode is set to the lowest value. That is, when the mode is shifted to the re-applied out mode or the subwoofer pre-out mode and the AV output mode is canceled, the set value of the output level of the output terminal 61 in the AV output mode is returned to the default value. In the AV output mode, items for performing settings related to the low-pass filter of the subwoofer in the audio setup menu cannot be selected.

  In this configuration, in the AV output mode, the audio IC 52 outputs the audio signal from the DVD player 51 from the output terminal 61 and the video signal from the DVD player 51 from the output terminals 60 and 62 regardless of the current source state. Output. The same applies when the source is in the standby state. In the AV output mode, subwoofer pre-out output cannot be performed. In this case, the audio IC 52 accepts selection and setting of the item “AV-OUT output level setting” in the audio setup menu, and sets the output level of the output terminal 61 based on the received setting value.

  In the re-applied out mode and the subwoofer pre-out mode, it is assumed that a rear speaker and a subwoofer are connected to the output terminal 61, respectively, and the audio IC 52 is connected to the output terminal 61 based on the set value set by the rotary encoder. Set the output level. When the AV output mode is selected, the output level of the output terminal 61 is set to the default value of the output level of the output terminal 61 in the AV output mode.

  According to the present embodiment, when the AV output mode is switched, the output level from the output terminal 61 is set to the lowest value, so that the output terminal 61 can be connected to the rear speaker without fear of generating an explosive sound from the subwoofer due to an erroneous operation. Can also be used for output to a subwoofer, and for outputting an audio signal in AV output.

It is a block diagram which shows the structure of the audio system which concerns on one Embodiment of this invention. It is a front view of the main body of the audio system of FIG. It is a figure which shows the process of the microcomputer when the sub woofer pre-out mode in the system of FIG. 1 is selected. It is a figure which shows the process of the microcomputer when the AV output mode in the system of FIG. 1 is selected. It is a block diagram which shows the structure of the audio system which concerns on another embodiment of this invention. It is a block diagram which shows the structure of the audio system which concerns on another embodiment of this invention. It is a block diagram which shows the structural example of the conventional audio system.

Explanation of symbols

11: tuner, 12, 51: DVD player, 13: television, 14: AV input, 15: audio selector, 16: video selector, 17-19: electronic volume, 20, 21, 53, 54: amplifier, 22, 55 : Front speaker, 23, 56: Rear speaker, 24, 57: Front pre-out, 25, 58: Re-appli out, 26: Subwoofer pre-out, 27-29, 60, 62: AV output terminal, 30: Microcomputer, 31, 59 : Subwoofer pre-out / AV output terminal 32, 33: Rotary encoder, 34: Switch button, 35: Display, 52: Audio IC, 61: Output terminal

Claims (7)

An output terminal that is also used for the output of the first audio signal and the output of the second audio signal having a higher level than that of the first audio signal;
Application setting means for setting whether to use the output terminal for outputting the first audio signal or for outputting the second audio signal in accordance with an instruction;
When the setting of the usage of the output terminal is changed from the output of the first audio signal to the output of the second audio signal, the initial output level from the output terminal after the change is set to a predetermined low level. An audio device comprising initial level setting means.   The predetermined low level is a level at which a reproduction sound by the device for the first audio signal based on the output of the second audio signal from the output terminal is not disturbing, or a minimum level that can be set. The audio device according to claim 1.   Level adjustment means for adjusting an output level of the second audio signal output from the output terminal based on an instruction when the use of the output terminal is set to output the second audio signal The audio apparatus according to claim 1, wherein the initial level setting unit sets the initial output level by controlling the level adjusting unit. Level adjusting means provided on a common path for the first audio signal and the second audio signal, for adjusting both output levels;
A first volume operating means and a second volume operating means operated respectively to indicate a first volume adjustment value and a second volume adjustment value;
When the use of the output terminal is set for outputting the first audio signal, the level adjusting means is controlled based on the first volume adjustment value, and the use of the output terminal is used for the second audio signal. Means for controlling the level adjusting means based on the second volume adjustment value when set for signal output,
The audio apparatus according to claim 1 or 2, wherein the initial level setting means sets the initial output level by controlling the level adjusting means.   5. The audio device according to claim 1, wherein the first audio signal is an audio signal for a subwoofer, and the second audio signal is an audio signal in an AV output. 6.   The first audio signal is an audio signal for a rear speaker and an audio signal for a subwoofer, the second audio signal is an audio signal in AV output, and the application setting unit sets the output terminal in response to an instruction. 6. The method of setting whether to use for output of an audio signal for a rear speaker, for output of an audio signal for the subwoofer, or for output of the second audio signal. The audio device according to any one of 1 to 4. An output switching method in an audio apparatus having an output terminal that is also used for output of a first audio signal and output of a second audio signal having a higher normal level than the first audio signal,
A step of setting whether the audio device uses the output terminal for outputting the first audio signal or for outputting the second audio signal according to an instruction;
When the setting of the use of the output terminal is changed from the output of the first audio signal to the output of the second audio signal, the audio device reduces the output level from the output terminal at the initial stage after the change to a predetermined low level. And a step of setting the level.

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