JP2008053985A - Audio device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an audio device to which a child lock function which prevents the increase of sound volume even in the case a child operates a master volume knob or volume adjustment keys of a remote controller operated by mischief, is added. <P>SOLUTION: When an up key and a down key out of volume adjustment keys of the remote controller are simultaneously depressed for a long time, a first child lock is set, and the value of an adjusted volume is stored in a memory. When the master volume knob or the up key and the down key out of the volume adjustment keys of the remote controller are operated by child's mischief, the volume is made lower than the value of the volume stored in the memory to output sounds from a speaker. When a prescribed time passes without simultaneous long-time depression of the up key and the down key, a second child lock by which the audio device does not react on operations of the master volume knob or the up key or the down key of the volume adjustment keys of the remote controller is set. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention has an electronic volume for adjusting the volume by changing the gain, a preamplifier for amplifying the input audio signal, and a main amplifier that amplifies the audio signal amplified by the preamplifier and supplies it to the speaker. With regard to an audio device including an amplifier, in particular, child lock processing that prevents the volume output from the speaker from increasing when the master volume knob on the main unit or the volume adjustment key on the remote control is operated due to a child's mischief About.

  As recording media for recording video / audio data, there are a video tape which is a conventionally known magnetic tape, a DVD (Digital Versatile Disc) which has been widely used in recent years, and the like. Video / audio data is recorded / reproduced on a video tape by a magnetic tape recording / reproducing apparatus such as a video cassette recorder, and video / audio data is recorded / reproduced on an DVD by an optical disk recording / reproducing apparatus such as a DVD recorder.

  By the way, when video / audio data of a movie is recorded on a videotape or DVD, if a home theater model is configured to enjoy the movie, the movie can be viewed in an environment close to a movie theater. When configuring a home theater model, a display device that displays video preferably has a large screen, and in order to obtain powerful output of audio, an audio device that outputs audio with a wide frequency band from low to high is often used. . When constructing such a home theater model, it is particularly important that the sound effect be close to that in a movie theater, so the audio device can be connected to a magnetic tape recording / playback device or an optical disk recording / playback device. Sound is output from the speaker of the apparatus.

  Conventionally, an audio device has a TV audio signal from a television receiver, an FM audio signal from an FM radio, a disc playback audio signal from an optical disc playback device or an optical disc recording / playback device, a tape playback audio signal from a magnetic tape recording / playback device, etc. , And a voice input switching circuit that selectively outputs one of these, a preamplifier that amplifies a voice signal selected by the voice input switching circuit by a predetermined process, and a power of the voice signal from the preamplifier. A main amplifier that amplifies and supplies to the speaker, a display unit that displays the operation status and operation contents of the device, a system controller that controls each component of the device, and stores information necessary for the operation of the system controller Infrared operation signals from the memory and remote control are received and converted into electrical signals, and the operation signals are A light receiving section that gives the controller, such as a plurality of operation keys and master volume control of the electronic volume giving various operation signals and an operation panel provided to the system controller.

The preamplifier indicates an equalizer circuit that corrects the frequency characteristics of the audio signal output from the audio input switching circuit, an electronic volume for adjusting the volume of the audio output from the speaker, and the volume adjusted by the electronic volume. A sound quality adjusting circuit that adjusts the sound quality of the sound signal and an amplifier circuit that amplifies the sound signal adjusted by the sound quality adjusting circuit and supplies the amplified sound signal to the main amplifier.
Japanese Patent Laid-Open No. 10-200990 JP 2005-159926 A JP 2005-204112 A

  In the conventional audio device having such a configuration, when adjusting the volume of the sound output from the speaker by adjusting the electronic volume, the volume is adjusted by turning the master volume knob provided on the operation panel of the audio device. If you have children who are still unrecognized in the home theater room, the child will not be aware of it. If the master volume knob of the audio device or the volume adjustment key of the remote control is manipulated by mischief, the volume suddenly increases, and the viewer may be surprised and unable to watch with peace of mind.

  In the prior art of Patent Document 1, when a specific key with a low frequency is pressed for a predetermined time among a large number of function keys provided on the remote controller, the original function is ignored and the control key of the electronic device is locked. However, the operation of the master volume knob of the audio device is not disclosed, and it is not possible to cope with the case where the volume suddenly increases when the child manipulates the master volume knob. Also, if you forget to press that particular key, the control key will not be locked, so if the remote control volume adjustment key is operated by a child's mischief, the volume may suddenly increase. It is not possible to deal with any case.

  In the prior art of Patent Document 2, when the key lock mode is executed, a key lock setting screen is displayed on the display unit, and when a remote control key to be key locked is operated, operation key information for the operation keys is displayed on the key lock setting screen. When the screen is closed, the key lock of the operation key corresponding to the displayed operation key information is set, but the operation of the master volume knob of the audio device is not disclosed, and the master volume knob is not If the sound volume suddenly increases when the operation is tricked, it cannot be dealt with. Also, if you forget to set the key lock, the key lock will not be applied, so if the volume adjustment key on the remote control is operated by a child's mischief, the volume may suddenly increase. I can't even deal with it.

  In the prior art of Patent Document 3, when a plurality of keys on the remote controller are pressed simultaneously, child lock is set, and the display of the remote control indicates that child lock has been established. The child lock is released when the simultaneous pressing is performed, but this conventional technique is not disclosed about the operation of the master volume knob of the audio device, and the child has operated the master volume knob with mischief. Sometimes, the volume cannot be dealt with suddenly. Also, if you forget to set the child lock, the child lock will not be applied, so if the volume adjustment key on the remote control is operated by a child's mischief, the volume may suddenly increase. I can't even deal with it.

  The present invention has been made in order to solve the above-described problems, and a child lock function that prevents the volume from becoming large even if a child is mischievous and operates the master volume knob of the main body or the volume adjustment key of the remote control. An object of the present invention is to provide an audio device to which is added.

  To achieve the above object, the invention of claim 1 has an electronic volume for adjusting the volume by changing the gain, a preamplifier for amplifying the input audio signal, and the audio amplified by this preamplifier. In an audio apparatus including a main amplifier that amplifies a signal and supplies the amplified signal to a speaker, the volume of the electronic volume is changed by changing the gain of the electronic volume in response to an operation of the master volume knob of the main body or the volume adjustment key of the remote controller. Volume adjustment control means for adjusting and controlling, Child lock mode determination means for determining whether or not the child lock mode is set as an initial setting after the volume adjustment control means has adjusted to a desired volume, and the child lock When it is determined that the mode is set, the up direction key of the volume adjustment key of the remote control A first key for setting a first child lock when it is determined that the down key and the down key are simultaneously pressed; Child lock setting means, adjusted volume value storage processing means for storing the adjusted volume value in a memory after the first child lock is set, and the adjusted volume value stored in the memory Thereafter, when the master volume knob or the volume adjustment key is operated, volume control means for reducing the volume of the electronic volume to reduce the volume from the value of the volume stored in the memory, and the upward direction Even if the master volume knob or the volume adjustment key is operated when a predetermined time elapses without pressing and holding the key and the down key at the same time, it reacts A second child lock setting means for setting a second child lock, and the up key and the down key after the first child lock is set or after the second child lock is set. And a system controller having child lock releasing means for releasing the first child lock or the second child lock when it is determined by the key determining means that the two are simultaneously pressed. An audio device is provided.

  In this configuration, the volume adjustment control means changes the gain of the electronic volume in response to an operation of the master volume knob of the main body or the volume adjustment key of the remote control, or the key of the user's preference. When the volume is adjusted, sound is output from the speaker at the adjusted volume. After the volume is adjusted to the preferred volume, the child lock mode determination means determines whether or not the child lock mode is set in the initial setting. When it is determined that the child lock mode is not set, the audio output is performed as usual. However, when it is determined that the child lock mode is set, the key determination means moves the volume control key upward of the remote control. It is determined whether or not the key and the down key are simultaneously pressed for a long time.

  When it is determined that the up key and the down key are simultaneously pressed for a long time, the first child lock setting means sets the first child lock. After the first child lock is set, the adjusted volume value storage processing means stores the adjusted volume value in the memory. After the adjusted volume value is stored in the memory, the gain of the electronic volume is reduced when the master volume knob or the up and down keys of the volume control key on the remote control are operated due to a child's mischief Thus, the volume is set to be lower than the volume value stored in the memory of the sound output from the speaker.

  On the other hand, when the predetermined time has elapsed without pressing and holding the up and down keys at the same time, the second child lock setting means uses the master volume knob or the up or down key of the volume adjustment key of the remote control. The second child lock is set so that no response will occur even if is operated.

  After the first child lock is set or after the second child lock is set, the child lock is released when it is determined by the key determining means that the up key and the down key have been pressed simultaneously. The means releases the first child lock or the second child lock. Thus, the viewer can increase or decrease the volume by operating the master volume knob or the up or down key of the volume adjustment key of the remote controller.

  According to this configuration, when the viewer presses and holds the up and down keys of the volume control key of the remote controller at the same time, the first child lock is set, and the master volume knob of the main body and the volume of the remote control are mischievous by the child. Even if the adjustment key is operated, the volume will only be reduced, so the viewer will not be surprised by the loud sound and can watch with peace of mind. Knowing that you have touched the master volume knob or the volume control key on the remote control, you can also give your child attention.

  In addition, the second child is set so that it does not react even if the master volume knob or the volume adjustment key is operated when a predetermined time elapses without simultaneously pressing and holding the up and down keys of the volume adjustment key of the remote control. Since the lock is set, even if you forget to press and hold the up and down keys at the same time for the volume adjustment key of the remote control for performing the first child lock, the second child lock will be activated after a predetermined time has passed. Therefore, even if the child is mischievous and the master volume knob on the main unit or the volume adjustment key on the remote control is operated, the volume will not increase, so that the viewer will not be surprised by the loud sound, Can watch. Even if the down key is operated by a child's mischief, since the second child lock is applied, the volume does not change, and the volume does not decrease and the viewer does not have difficulty listening.

  The invention of claim 2 has an electronic volume for adjusting the volume by changing the gain, a preamplifier for amplifying the input audio signal, and power amplifying the audio signal amplified by this preamplifier to the speaker. A volume adjustment control means for adjusting and controlling the volume by changing the gain of the electronic volume in response to an operation of a master volume knob of the main body or a volume adjustment key of a remote controller in an audio device configured to include a main amplifier to be supplied; The child lock mode determining means for determining whether or not the child lock mode is set in the initial setting after the sound volume adjustment control means has adjusted the sound volume to a preferred volume, and the child lock mode is determined to be set. A key judgment for determining whether or not a predetermined key on the remote control has been pressed for a long time. Means, a first child lock setting means for setting a first child lock when it is determined that the predetermined key has been pressed for a long time, and the adjusted volume after the first child lock is set. And an adjusted volume value storage processing means for storing the value of the electronic volume when the master volume knob or the volume adjustment key is operated after the adjusted volume value is stored in the memory. Volume control means for lowering the gain to make the volume smaller than the volume value stored in the memory, and the master volume knob or the volume when the predetermined key elapses without long pressing the predetermined key A second child lock setting means for setting a second child lock which does not react even if the adjustment key is operated; After the child lock is set, or after the second child lock is set, if it is determined by the key determination means that the predetermined key has been pressed, the first child lock or the There is provided an audio apparatus comprising a system controller having child lock releasing means for releasing a second child lock.

  In this configuration, the volume adjustment control means changes the gain of the electronic volume in response to an operation of the master volume knob of the main body or the volume adjustment key of the remote control, or the key of the user's preference. When the volume is adjusted, sound is output from the speaker at the adjusted volume. After the volume is adjusted to the preferred volume, the child lock mode determination means determines whether or not the child lock mode is set in the initial setting. When it is determined that the child lock mode is not set, the audio output is performed as usual. However, when it is determined that the child lock mode is set, the key determination means determines that the predetermined key of the remote control is long. It is determined whether or not it has been pressed.

  When it is determined that a predetermined key of the remote controller has been pressed for a long time, the first child lock setting means sets the first child lock. After the first child lock is set, the adjusted volume value storage processing means stores the adjusted volume value in the memory. After the adjusted volume value is stored in the memory, the gain of the electronic volume is reduced when the master volume knob or the up / down key of the volume control key on the remote control is operated due to a child's mischief Thus, the volume is set to be lower than the volume value stored in the memory of the sound output from the speaker.

  On the other hand, when a predetermined time has elapsed without pressing a predetermined key on the remote control, the second child lock setting means operates the master volume knob or the up / down key of the remote control volume adjustment key. The second child lock is set so that no reaction occurs.

  After the first child lock is set or after the second child lock is set, if it is determined by the key determining means that a predetermined key of the remote controller has been pressed, the child lock releasing means Release the first child lock or the second child lock. Thus, the viewer can increase or decrease the volume by operating the master volume knob or the up or down key of the volume adjustment key of the remote controller.

  According to this configuration, when the viewer presses and holds a predetermined key on the remote control, the first child lock is set, and even if the child mischiefly operates the master volume knob on the main body or the volume adjustment key on the remote control, The viewer will not be surprised by a loud sound and can be watched with peace of mind, and the volume will be reduced so that the child can be mischievous and the master volume knob on the main unit or volume control key on the remote control. Knowing that you touched, you can give attention to your child.

  In addition, since a second child lock is set so as not to react even if the master volume knob or the volume adjustment key is operated when a predetermined time elapses without pressing and holding a predetermined key of the remote control of the remote control, Even if you forget to press and hold a predetermined key on the remote control for performing the first child lock, the second child lock will be applied if the predetermined time elapses. Even if the volume adjustment key is operated, the volume does not increase, so that the viewer is not surprised by a loud sound, and can view with peace of mind. Even if the down key is operated by a child's mischief, since the second child lock is applied, the volume does not change, and the volume does not decrease and the viewer does not have difficulty listening.

  In the invention of claim 3, in the invention of claim 2, the long press of the predetermined key of the remote control is to simultaneously press and hold the up and down keys of the volume adjustment key of the remote control, When it is determined that the child lock mode is set, the key determination means determines whether or not the up and down keys of the volume adjustment key of the remote control are simultaneously pressed and held. Therefore, to perform child lock related to the volume, the up and down keys of the volume adjustment key of the existing remote control for volume adjustment can be used, which is convenient for the user.

  As described above, according to the present invention, when the viewer presses and holds the up and down keys of the volume control key of the remote controller at the same time, the first child lock is set, and the master volume knob of the main body is set by the child. Even if the volume adjustment key on the remote control is operated, the volume will only be reduced, so that the viewer will not be surprised by the loud sound and can watch with peace of mind. Knowing that you have touched the master volume knob on the main unit or the volume control key on the remote control in a mischievous way, you can also give your child attention.

  In addition, the second child is set so that it does not react even if the master volume knob or the volume adjustment key is operated when a predetermined time elapses without simultaneously pressing and holding the up and down keys of the volume adjustment key of the remote control. Since the lock is set, even if you forget to press and hold the up and down keys at the same time for the volume adjustment key of the remote control for performing the first child lock, the second child lock will be activated after a predetermined time has passed. Therefore, even if the child is mischievous and the master volume knob on the main unit or the volume adjustment key on the remote control is operated, the volume will not increase, so that the viewer will not be surprised by the loud sound, Can watch. Even if the down key is operated by a child's mischief, since the second child lock is applied, the volume does not change, and the volume does not decrease and the viewer does not have difficulty listening.

  In addition, according to the present invention, when the viewer presses and holds a predetermined key on the remote control, the first child lock is set, and even if the child mischiefly operates the master volume knob on the main body or the volume adjustment key on the remote control. Because the volume is only low, the viewer will not be surprised by the loud sound and can watch it with peace of mind. It can be seen that the adjustment key has been touched, and attention can be given to the child.

  In addition, since a second child lock is set so as not to react even if the master volume knob or the volume adjustment key is operated when a predetermined time elapses without pressing and holding a predetermined key of the remote control of the remote control, Even if you forget to press and hold a predetermined key on the remote control for performing the first child lock, the second child lock will be applied if the predetermined time elapses. Even if the volume adjustment key is operated, the volume does not increase, so that the viewer is not surprised by a loud sound, and can view with peace of mind. Even if the down key is operated by a child's mischief, since the second child lock is applied, the volume does not change, and the volume does not decrease and the viewer does not have difficulty listening.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of an audio apparatus according to an embodiment of the present invention.

  This audio apparatus A includes a TV audio signal from a television receiver, an FM audio signal from an FM radio, a disk playback audio signal from an optical disk playback device or an optical disk recording / playback device, a tape playback audio signal from a magnetic tape recording / playback device, etc. , The audio input switching circuit 1 for selectively outputting one of these signals, the preamplifier 2 for amplifying the audio signal selected by the audio input switching circuit 1 by a predetermined process, and the preamplifier 2 A main amplifier 3 that amplifies an audio signal and supplies it to the speakers 9 and 10, a display unit 4 that displays the operation state and operation contents of the device, a system controller 5 that controls each component of the device, and the system A memory 6 for storing information necessary for the operation of the controller 5 and an infrared operation signal from the remote controller 11 are received as an electrical signal. In other words, a light receiving unit 7 for supplying an operation signal to the system controller 5, a plurality of operation keys for supplying various operation signals to the system controller 5, a master volume knob 22a (see FIG. 2) of the electronic volume 22, and the like are provided. And an operation panel 8.

  The preamplifier 2 includes an equalizer circuit 21 that corrects the frequency characteristics of the audio signal output from the audio input switching circuit 1, an electronic volume 22 for adjusting the volume of the audio output from the speakers 9 and 10, and the electronic volume. A sound quality adjustment circuit 23 that adjusts the sound quality of the sound signal indicating the volume adjusted at 22, and an amplification circuit 24 that amplifies the sound signal adjusted by the sound quality adjustment circuit 23 and supplies the sound signal to the main amplifier 3. It is configured.

  FIG. 2 is a schematic front view showing an example of an operation panel of the audio apparatus according to the present embodiment. In FIG. 2, the operation panel 8 displays, for example, five equalizer adjustment knobs 21a for changing the frequency characteristics of the equalizer circuit 21 (see FIG. 1) included in the preamplifier 2, the operation state of the apparatus, the operation contents, and the like. There are provided a display unit 4, a light receiving unit 7 that receives an infrared operation signal from a remote controller 11 (see FIG. 1), a master volume knob 22 a of an electronic volume 22 included in the preamplifier 2, and the like.

  FIG. 3 is a key arrangement diagram showing an example of the arrangement of operation keys of a remote controller that outputs an infrared operation signal for operating the audio apparatus according to the present embodiment. In FIG. 3, the remote controller 11 includes a power key P, a volume adjustment key up key 22b, a volume adjustment key down key 22c, a plurality of numeric keys N, an up key a, a down key b, and a left key c. A right direction key d, an enter key (decision key) e, and a plurality of other operation keys.

  FIG. 4 is a flowchart for explaining child lock processing of the audio apparatus according to this embodiment. The child lock process of the audio apparatus will be described with reference to this flowchart and FIGS.

  In the description here, it is assumed that a DVD player for reproducing video / audio data recorded on, for example, a DVD (Digital Versatile Disc) is connected to the audio device A, and the DVD mode is set by the operation of the remote controller 11. . Of the video and audio data reproduced by the DVD player, the audio data is subjected to predetermined processing and converted into an analog audio signal, which is input to the audio input switching circuit 1 of the audio device A as a disc playback audio signal.

  Since the audio input switching circuit 1 is set to the DVD mode by the operation of the remote controller 11, the disk reproduction audio signal (hereinafter simply referred to as an audio signal) is selected and input to the equalizer circuit 21 of the preamplifier 2. The sound signal input to the equalizer circuit 21 is corrected in frequency characteristics according to the set position of the equalizer adjustment knob 21 a and input to the electronic volume 22.

  The audio signal input to the electronic volume 22 is an audio signal at a level corresponding to the volume set by the master volume knob 22a, or the volume set by the up key 22b or the down key 22c of the volume adjustment key of the remote controller 11. And the sound quality is adjusted by the sound quality adjustment circuit 23 and further input to the amplification circuit 24 for amplification. The audio signal output from the amplifying circuit 24 is supplied to the main amplifier 3, power amplified, supplied to the speakers 9 and 10, and converted into audio.

  That is, the volume adjustment control means of the system controller 5 changes the gain of the electronic volume 22 in response to the operation of the main volume knob 22a of the main body or the volume adjustment key up direction key 22b or the down direction key 22c of the remote control 11. Then, the volume is set, and the sound is output from the speakers 9 and 10 at the set volume (step S1). Then, when the master volume knob 22a of the main body or the up direction key 22b or down direction key 22c of the volume adjustment key of the remote control 11 is operated and adjusted to the user's preferred volume (step S2), this adjustment is performed. Sound is output from the speakers 9 and 10 at a volume (step S3).

  After the volume is adjusted to the preferred volume by the volume adjustment control means, the child lock mode determination means of the system controller 5 determines whether or not the child lock mode is set in the initial setting (step S4). When it is determined that the child lock mode is not set, the sound is output as usual (step S5). When it is determined that the child lock mode is set, the key determination means of the system controller 5 is used. Determines whether the up key 22b and the down key 22c of the volume control key of the remote controller 11 have been pressed at the same time (step S6).

  When it is determined that the up direction key 22b and the down direction key 22c are pressed at the same time, the first child lock setting means of the system controller 5 sets the first child lock (step S7). After the first child lock is set, the adjusted volume value storage processing means of the system controller 5 stores the adjusted volume value in the memory 6 (step S8). After the adjusted volume value is stored in the memory 6, when the master volume knob 22a or the volume adjustment key up direction key 22b or the down direction key 22c of the remote control 11 is operated by a child's mischief, The gain of the electronic volume 22 is reduced to make the volume smaller than the volume value stored in the memory 6 of the sound output from the speakers 9 and 10 (step S10).

  On the other hand, when a predetermined time (for example, 5 seconds) elapses without the upper key 22b and the lower key 22c being pressed at the same time (step S11), the second child lock setting means of the system controller 5 uses the master volume knob. The second child lock is set so as not to react even if the up key 22b or down key 22c of the volume adjustment key 22a or the remote control 11 is operated (step S12).

  After the first child lock is set or after the second child lock is set, the up key 22b and the down key 22c of the volume adjustment key of the remote controller 11 are simultaneously pressed for a long time. If it is determined by the key determination means (step S13), the child lock release means of the system controller 5 releases the first child lock or the second child lock (step S14). Accordingly, the viewer can increase or decrease the volume by operating the master volume knob 22a or the up key 22b or the down key 22c of the volume adjustment key of the remote controller 11. It should be noted that, instead of simultaneously pressing and holding the up key 22b and the down key 22c of the volume adjustment key of the remote controller 11, if a predetermined key of the remote controller 11 is pressed long, the first and second child locks are set, Moreover, you may comprise so that a 1st, 2nd child lock may be cancelled | released.

  As described above, according to the present embodiment, when the viewer presses and holds the up key 22b and down key 22c of the volume control key of the remote controller 11 at the same time, the first child lock is set and the child is mischievous. Even if the master volume knob 22a of the main body or the volume adjustment key up direction key 22b or the down direction key 22c of the remote control 11 is operated, the volume is only reduced, so that the viewer is not surprised by a loud sound. It is possible to watch with confidence and because the volume is reduced, it can be understood that the child has touched the master volume knob 22a of the main body or the up key 22b or down key 22c of the volume adjustment key of the remote control 11 by mischief. Can also give attention to children.

  Further, when a predetermined time elapses without simultaneously pressing and holding the up key 22b and down key 22c of the volume control key of the remote controller 11, the master volume knob 22a or the up key 22b of the volume control key of the remote control 11 is passed. Since the second child lock is set so as not to react even if the down key 22c is operated, the up and down keys of the volume control key of the remote controller for performing the first child lock are simultaneously held. Even if you forget to press the button, the second child lock will be applied if the predetermined time has elapsed, so the child can play with the master volume knob on the main unit or the volume adjustment key up key 22b or the down key 22c on the remote control 11. The volume does n’t increase when you operate, so viewers wo n’t be surprised by loud sounds, Kokoroshite can be viewed. Even if the down key 22c is operated by a child's mischief, the second child lock is applied, so the volume does not change and the volume does not decrease and the viewer does not have difficulty listening.

  The present invention can be used for an audio apparatus, and a child lock function can be added so that the volume does not increase even if a child touches the master volume knob on the main body or the volume adjustment key on the remote controller.

It is a block diagram which shows the structure of the audio apparatus which concerns on one Embodiment of this invention. It is a schematic front view which shows an example of the operation panel of the audio apparatus in the said embodiment. It is a key arrangement | positioning figure which shows an example of arrangement | positioning of the operation key of the remote control which outputs the infrared rays operation signal for operating with respect to the audio apparatus in the said embodiment. It is a flowchart for demonstrating the child lock process of the audio apparatus in the said embodiment.

Explanation of symbols

A audio device 2 preamplifier 3 main amplifier 5 system controller (volume adjustment control means, child lock mode determination means, key determination means, first child lock setting means, adjustment volume value storage processing means, volume control means, second child lock setting Means, child lock release means)
6 Memory 9, 10 Speaker 11 Remote control 22 Electronic volume 22a Master volume knob 22b Volume adjustment key up key 22c Volume adjustment key down key

Claims (3)

A preamplifier that has an electronic volume for adjusting the volume by changing the gain, amplifies the input audio signal, and a main amplifier that amplifies the audio signal amplified by the preamplifier and supplies it to the speaker In the configured audio device,
Volume adjustment control means for adjusting the volume by changing the gain of the electronic volume in response to an operation of a master volume knob of the main body or a volume adjustment key of the remote control;
A child lock mode determination means for determining whether or not the child lock mode is set in the initial setting after the volume adjustment control means has adjusted to a preferred volume;
A key determination means for determining whether or not the up and down keys of the volume adjustment key of the remote control are simultaneously pressed for a long time when it is determined that the child lock mode is set;
A first child lock setting means for setting a first child lock when it is determined that the up direction key and the down direction key are simultaneously pressed and held;
After the first child lock is set, adjusted volume value storage processing means for storing the adjusted volume value in a memory;
After the adjusted volume value is stored in the memory, when the master volume knob or the volume adjustment key is operated, the gain of the electronic volume is reduced to be lower than the volume value stored in the memory. Volume control means to reduce the volume,
The second child lock is set so that no response is made even if the master volume knob or the volume adjustment key is operated when a predetermined time has elapsed without simultaneously pressing the up and down keys simultaneously. 2 child lock setting means;
After the first child lock is set, or after the second child lock is set, it is determined by the key determination means that the up key and the down key are simultaneously pressed for a long time. An audio device comprising: a system controller having child lock releasing means for releasing the first child lock or the second child lock. A preamplifier that has an electronic volume for adjusting the volume by changing the gain, amplifies the input audio signal, and a main amplifier that amplifies the audio signal amplified by the preamplifier and supplies it to the speaker In the configured audio device,
Volume adjustment control means for adjusting the volume by changing the gain of the electronic volume in response to an operation of a master volume knob of the main body or a volume adjustment key of the remote control;
A child lock mode determination means for determining whether or not the child lock mode is set in the initial setting after the volume adjustment control means has adjusted to a preferred volume;
Key determination means for determining whether or not a predetermined key of the remote control has been pressed for a long time when it is determined that the child lock mode is set;
First child lock setting means for setting a first child lock when it is determined that the predetermined key has been pressed and held;
After the first child lock is set, adjusted volume value storage processing means for storing the adjusted volume value in a memory;
After the adjusted volume value is stored in the memory, when the master volume knob or the volume adjustment key is operated, the gain of the electronic volume is reduced to be lower than the volume value stored in the memory. Volume control means to reduce the volume,
Second child lock setting means for setting a second child lock that does not react even when the master volume knob or the volume adjustment key is operated when a predetermined time elapses without the predetermined key being pressed for a long time. When,
After the first child lock is set, or after the second child lock is set, when the key determination means determines that the predetermined key has been pressed for a long time, the first child lock An audio apparatus comprising: a system controller having a lock or a child lock releasing means for releasing the second child lock.   The predetermined key press of the remote controller is to simultaneously press and hold the up and down keys of the remote control volume adjustment key, and the key determination means is set to the child lock mode. The audio apparatus according to claim 2, wherein when it is determined, the audio device determines whether or not the up and down keys of the volume adjustment key of the remote controller have been pressed at the same time.

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