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DESCRIPTION JP2007295383

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DESCRIPTION JP2007295383
The present invention provides an audio output device capable of switching an output
destination of an audio signal without adding and removing an earphone each time by adding a
simple configuration. An audio output device (television receiver) 1 receives a switching signal
output from a remote control 14 when a remote control signal receiving unit 11 receives it, a
control signal from a control unit 13 causes an audio output destination to be a speaker 8 and an
earphone. An audio signal output unit 7 selectively switching to 19 is provided. When switching
the output destination of the audio signal, the audio signal output unit 7 limits the maximum
volume to a constant value if the volume immediately before is equal to or higher than the
constant value. Furthermore, when the plug 19P of the earphone 19 is not connected to the
earphone terminal 9, even if the switching signal is output from the remote control 14, only the
speaker 8 is set as the output destination without setting the earphone terminal 9 as the output
destination. Set Thereby, the user can easily switch the output destination of the sound without
attaching and detaching the earphone 19 to the sound output device 1. [Selected figure] Figure 2
Voice output device
[0001]
The present invention is generally referred to as earphones and headphones (hereinafter referred
to as earphones). ) Is connected to the earphone terminal in advance, the remote controller
(hereinafter referred to as a remote controller). The present invention relates to an audio output
device capable of switching an output destination of an audio signal to a speaker or an earphone
in accordance with a switching signal from
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1
[0002]
Conventionally, an audio output device such as a television receiver (hereinafter referred to as a
television), a radio, an audio device or the like usually emits sound from a built-in speaker or a
speaker connected to a speaker terminal. In addition, when the plug of the earphone is connected
to the earphone terminal, the audio output from the speaker is stopped and the audio is emitted
from the earphone.
[0003]
For example, when watching the television, the user listens to the sound emitted from the
speaker, but when the user wears an earphone from a certain time to listen to the sound so that
the sound does not become a nuisance to the surroundings , It is necessary to connect the plug of
the earphone to the earphone terminal provided on the television. In addition, the user listened to
the sound with the earphone while watching the television, but when listening to the sound
emitted from the speaker by a plurality of people along the way, it is necessary to unplug the
earphone from the earphone terminal of the television There is.
[0004]
However, in any case, the user has to stand up, move to the installation place of the television
(voice output device), work, and return to the seat, which is troublesome.
[0005]
Therefore, conventionally, the transmitter of the audio signal is incorporated in the main body of
the television, and the receiver of the audio signal and the earphone are incorporated in the
wireless remote control for television operation, and the audio signal from the main body is
received by the remote control. The invention regarding the remote controller with a receiver of
the structure which can listen to an audio | voice without connecting the plug of an earphone to
the earphone terminal of a television is disclosed (refer patent document 1).
JP 2000-138880 A
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2
[0006]
However, in the invention described in Patent Document 1, as described above, in order to
transmit and receive an audio signal between the television and the remote controller, the
television is a transmitter of the audio signal, and the remote controller is an audio signal
receiver. And an earphone cord storage reel etc. Therefore, there is a problem that the device
body and the remote control become large and it becomes difficult to handle.
[0007]
Therefore, according to the present invention, an audio output device capable of switching the
output destination of the audio signal without adding the simple configuration and hardly
increasing the size of the device and performing the attachment and removal of the earphone
every time Intended to provide.
[0008]
The present invention has the following configuration as means for solving the above-mentioned
problems.
[0009]
(1) Audio signal amplifying means for amplifying an audio signal, Audio signal output means for
selectively outputting the audio signal amplified by the audio signal amplifying means to an
earphone terminal or a built-in speaker, and transmitted from a remote controller An audio signal
output device comprising remote control signal receiving means for receiving a control signal to
a main body, wherein the audio signal output means is a switch for instructing switching of an
output destination of an audio signal by the control signal received by the remote control signal
receiving means. If it is a signal, the output destination of the audio signal is switched to the
speaker or the earphone terminal according to the switching signal, and in the audio signal
amplifying unit, the remote control signal receiving unit receives the switching signal from the
remote controller. If the amplification factor during the operation exceeds the preset standard
value, this amplification factor And setting the standard value.
[0010]
In this configuration, the audio signal output unit switches the output destination of the audio
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signal to the speaker or the earphone according to the switching signal output from the remote
controller.
Also, when switching the output destination of the audio signal, if the amplification factor
exceeds the preset standard value, this amplification factor is set to the standard value.
Therefore, the user can connect the earphone to the earphone terminal in advance, keep the
earphone at hand, and switch the output destination of the sound to the speaker or the earphone
according to the surrounding condition by operating the remote controller.
As a result, the user does not have to move to the location of the earphone terminal of the voice
output device in order to switch the voice output destination, and can easily switch the voice
output destination. Also, when the volume is at the maximum level and you are listening to the
sound with the earphones, and you switch the output destination of the sound signal to the
speaker, the speaker emits the sound of the maximum level volume, causing troubles in the
surroundings, In some cases, the speaker may be damaged. In addition, when the volume is at the
maximum level and the speaker is listening to the voice and the output destination of the voice
signal is switched to the earphone, the voice of the volume of the maximum level is emitted from
the earphone, and in some cases, the user hurts the ear there is a possibility. However, in the
present invention, when the output destination of the audio signal is switched, the audio signal
amplification means sets the amplification factor to the standard value if the amplification factor
exceeds the preset standard value. Therefore, when the output destination of the audio signal is
switched, it is possible to prevent the loud sound from being emitted from the speaker or the
earphone, and to prevent the speaker from being damaged or the user from hurting the eardrum.
[0011]
(2) connection detection means for detecting presence or absence of connection of the device at
the earphone terminal, the sound signal output means detecting that the connection detection
means does not connect the device to the earphone terminal In this case, regardless of the
switching signal received by the remote control signal receiving means, only the speaker is used
as the output destination of the audio signal.
[0012]
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In this configuration, when a device such as an earphone or headphone is not connected to the
earphone terminal, only the speaker is not set as the output destination of the audio signal
regardless of the switching signal received by the remote control signal receiving means. Is set as
the output destination of the audio signal.
Therefore, even when the device is not connected to the earphone terminal, even if the remote
controller is operated by mistake, the output destination of the audio signal from the speaker to
the device is not switched to be silent, preventing the audio from being interrupted. it can.
[0013]
(3) The audio signal output means electrically opens / closes between the audio signal
amplification means and the earphone. First open / close means electrically opens / closes
between the audio signal amplification means and the speaker A second opening / closing means
is alternately switched between a state in which the first opening / closing means is open and the
second opening / closing means is closed, and a state in which the first opening / closing means
is closed and the second opening / closing means is open. And control means for controlling the
first opening / closing means and the second opening / closing means.
[0014]
In this configuration, the control means controls the opening / closing operation so that the first
opening / closing means and the second opening / closing means are not simultaneously opened
or closed. It can be switched.
[0015]
According to the present invention, by connecting the earphone to the voice output device in
advance and placing the earphone at hand, the user can control the voice by operating the
remote control without attaching or removing the earphone from the voice output device. The
output destination of can be switched.
In addition, when switching the output destination of the audio signal, the volume is limited to a
constant value if the volume is a certain value or more, so when the output destination of the
audio signal is switched, the loud sound is emitted from the speaker or earphone It can be
prevented from being sounded, and the speaker can be prevented from being damaged and the
user from hurting the tympanic membrane.
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[0016]
Hereinafter, a television receiver which is an example of an audio output device according to an
embodiment of the present invention will be described.
[0017]
FIG. 1 is a block diagram showing the main configuration of a television receiver.
The television receiver 1 includes a tuner 2, a video / audio separation unit 3, an OSD processing
unit 4, a video signal output unit 5, a display unit 6, an audio signal output unit 7, a speaker 8, an
earphone terminal 9, an operation unit 10, a remote control signal The receiving unit 11, the
storage unit 12, and the control unit 13 are provided.
An antenna 2A is connected to the tuner 2. Further, a plug 19 P of the earphone 19 is connected
to the earphone terminal 9. The user can control the operation of the television receiver 1 by
operating the operation unit 10 and the remote controller 14.
[0018]
The tuner 2 extracts and outputs a television broadcast signal of a selected channel from the
television broadcast signal received by the antenna 2A. The selected channel is designated by the
control unit 13.
[0019]
The video / audio separation unit 3 separates and extracts the television broadcast signal output
from the tuner 2 into a video signal and an audio signal. The video signal output from the video /
audio separation unit 3 is sent to the video signal output unit 5 via the OSD processing unit 4.
[0020]
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The OSD processing unit 4 incorporates an OSD image memory 4M, and superimposes
characters and figures on the video signal based on the control signal supplied from the control
unit 13. The OSD image memory 4M stores characters and figures to be superimposed on the
video.
[0021]
The video signal output unit 5 outputs the video signal output from the OSD processing unit 4 to
the display unit 6.
[0022]
The display unit 6 is composed of a CRT, liquid crystal or the like to display an image.
[0023]
The audio signal output unit 7 incorporates an audio amplifier (not shown), amplifies the audio
signal output from the video / audio separation unit 3, and outputs the amplified audio signal to
the built-in speaker 8 or earphone 19.
The amplification amount is determined by the control unit 13 and corresponds to the set
volume level stored in the storage unit 12.
[0024]
The speaker 8 and the earphone 19 emit the sound to the outside.
[0025]
The operation unit 10 and the remote control 14 are for the user to perform operations such as
adjustment of a set volume level and switching of an output destination (speaker 8 or earphone
19) of sound.
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The operation unit 10 and the remote controller 14 have a selection key for selecting whether
the voice output destination (sound output destination) is to be the speaker 8 or the earphone
19.
[0026]
The remote control signal receiving unit 11 receives the signal (infrared ray) output from the
remote control 14.
The remote control signal reception unit 11 receives an instruction signal from the remote
control 14 and transmits it to the control unit 13 when an instruction such as power ON / OFF,
channel switching, adjustment of a set volume level, or the like is input.
[0027]
The storage unit 12 is composed of a non-volatile memory, and can update stored contents. The
storage unit 12 includes, for example, a semiconductor memory or a hard disk, and stores
various setting values such as a set volume level. The set volume level is a level of volume
adjusted (set) by the user using the operation unit 10 or the remote control 14.
[0028]
The control unit 13 controls each unit of the television receiver 1. The control unit 13 is
configured of, for example, a microcomputer. The control unit 13 also has a ROM 13a for storing
a control program, and a RAM 13b as a work field for developing the control program and the
like.
[0029]
With such a configuration, the television receiver 1 causes the display unit 6 to display a video of
a television program and causes the speaker 8 or the earphone 19 to emit sound such as a
television program.
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[0030]
In addition, operating power is supplied to each part of the television receiver 1 from a power
supply circuit (not shown).
The input of this power supply circuit is a commercial power supply (for example, AC 100 V).
[0031]
Next, a specific configuration of the output system of the audio signal will be described. FIG. 2 is
a circuit diagram showing a configuration example of an output system of an audio signal in the
television receiver. As shown in FIG. 2, the audio signal output unit 7 includes an audio amplifier
71 and transistors Tr1, Tr2, and Tr3. The base of the transistor Tr1 is connected to the signal
output terminal 13S of the control unit 13, the collector is connected to the output terminal 71S
of the audio amplifier 71, and the emitter is connected to one terminal 9A of the earphone
terminal 9. The transistor Tr2 has a base connected to the signal output terminal 13S of the
control unit 13, a collector connected to the power supply Vcc and the base of the transistor Tr3,
and an emitter connected to GND (ground). Further, the base of the transistor Tr3 is connected to
the power supply Vcc and the collector of the transistor Tr2, the collector is connected to the
output terminal 71S of the audio amplifier 71, and the emitter is connected to one terminal 8A of
the speaker 8. The other terminal 8B of the speaker 8 and the other terminal 9B of the earphone
terminal 9 are connected to GND (ground).
[0032]
The audio amplifier 71 amplifies the audio signal output from the video / audio separation unit 3
and outputs the amplified audio signal to the speaker 8 or the earphone 19. The transistor Tr1
connects and disconnects the audio amplifier 71 and the earphone terminal 9 in accordance with
the control signal from the control unit 13. The transistor Tr2 controls the operation of the
transistor Tr3 in accordance with the control signal from the control unit 13. The transistor Tr3
connects and disconnects the audio amplifier 71 and the speaker 8.
[0033]
The plug 19P of the earphone 19 can be inserted into and removed from the earphone terminal
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9. The terminal 19A of the plug 19P is connected to one terminal 9A of the earphone terminal,
and the terminal 19B of the plug 19P is connected to the other terminal 9B of the earphone
terminal.
[0034]
Next, a procedure for switching devices for emitting sound when viewing a television program or
the like in the television receiver 1 will be described.
The user connects the plug 19 P of the earphone 19 to the earphone terminal 9 in advance, and
places the earphone 19 at the user's hand. Then, the user can switch the output destination of
the audio signal from the speaker 8 to the earphone 19 or from the earphone 19 to the speaker
8 by operating the audio output destination switching button (not shown) of the remote
controller 14.
[0035]
The remote controller 14 is a signal instructing switching of the output destination of the audio
signal (hereinafter referred to as a switching signal) when the audio output destination switching
button is operated. Output). In addition, as a carrier wave of this switching signal, for example,
infrared rays, radio waves and the like are used.
[0036]
When the television receiver 1 emits an audio signal from the speaker 8 before receiving the
switching signal output from the remote control 14, the control unit 13 outputs a Lo signal as a
control signal to the transistors Tr1 and Tr2 The transistors Tr1 and Tr2 are off and the
transistor Tr3 is on. As a result, the audio signal output from the audio amplifier 71 is output
only to the speaker 8, and the speaker 8 emits sound.
[0037]
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When the user switches the output destination of the audio signal from the speaker 8 to the
earphone 19, the user operates the audio output destination switching button of the remote
controller 14. The remote controller 14 outputs (sends) a switching signal according to this
operation. When the remote control signal reception unit 11 receives the switching signal output
from the remote control 14, the control unit 13 of the television receiver 1 switches the control
signal from Lo to Hi. As a result, the transistors Tr1 and Tr2 are turned on and the transistor Tr3
is turned off, so the audio signal output from the audio amplifier 71 is output only to the
earphone 19, and the earphone 19 emits sound.
[0038]
On the other hand, when the television receiver 1 emits an audio signal from the earphone 19
before receiving the switching signal output from the remote control 14, the control unit 13
sends a Hi signal as a control signal to the transistors Tr1 and Tr2. The transistors Tr1 and Tr2
are turned on, and the transistor Tr3 is turned off. As a result, the audio signal output from the
audio amplifier 71 is output only to the earphone 19, and the audio is emitted from the earphone
19.
[0039]
When the user switches the output destination of the audio signal from the earphone 19 to the
speaker 8, the user operates the audio output destination switching button of the remote
controller 14. The remote controller 14 outputs (sends) a switching signal according to this
operation. When the remote control signal reception unit 11 receives the switching signal output
from the remote control 14, the control unit 13 of the television receiver 1 switches the control
signal from Hi to Lo. As a result, the transistors Tr1 and Tr2 are turned off, and the transistor Tr3
is turned on, so that the audio signal output from the audio amplifier 71 is output only to the
speaker 8, and the speaker 8 emits sound.
[0040]
Further, even when the plug 19P of the earphone 19 is not connected to the earphone terminal
9, the television receiver 1 outputs the audio signal to the earphone when the control signal is
received in the state where the audio signal is output to the speaker 8. Switch to the terminal 9
side. In this case, since the plug 19P of the earphone 19 is not connected to the earphone
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terminal 9, it operates as a mere speaker mute (silence state).
[0041]
Furthermore, in the television receiver 1, when the output destination of the audio signal is
switched, the volume is limited so that the speaker 8 and the earphone 19 do not emit a large
volume of audio. That is, the audio amplifier 71 has a function of reducing the volume when
receiving a control signal for switching the output destination of the audio signal from the
control unit 13. For example, when the volume (volume) setting is set in the range of 0 to 10, the
user turns the volume to 8 to 10 and listens to the voice with the earphone 19, and the output
destination of the voice signal is halfway When switching to the speaker 8, a large volume of
sound is emitted from the speaker 8, which is likely to cause trouble to people around it. In
addition, when the user changes the volume to 8 to 10 and listens to the sound with the speaker
8 and switches the output destination of the sound signal to the earphone 19 on the way, there is
a possibility that the ear may be injured depending on the wearing state of the earphone 19 Is
high.
[0042]
Therefore, in the television receiver 1 of the present invention, when the user listens to the audio
at a volume (volume) higher than a predetermined volume before receiving the control signal for
switching the output destination of the audio signal, regardless of the volume. Reduce the
maximum volume value to a fixed value. For example, as described above, when the volume
(volume) setting is set in the range of 0 to 10, the user is listening to the audio, for example, with
the volume 8 or the volume 5 or higher and the output destination of the audio signal The audio
amplifier 71 limits the maximum value of the volume to 5 when receiving the control signal to
switch the. This can prevent the surrounding people from being annoyed or hurting the user's
ear.
[0043]
Next, the television receiver 1 can be configured to switch the audio output destination by
outputting a control signal from the control unit 13 to the audio amplifier 71 without providing
the transistors Tr1 to Tr3. is there. In addition, when the plug 19P of the earphone 19 is not
connected to the earphone terminal 9, even if the user operates the audio output destination
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switching button of the remote control 14, the audio signal output destination is not switched. It
is possible. Furthermore, in the television receiver 1, as in the case of the television receiver 1
shown in FIG. 2, when the output destination of the audio signal is switched, the volume of the
sound is not emitted from the speaker 8 or the earphone 19 Is configured to limit the The details
will be described below.
[0044]
FIG. 3 is a circuit diagram showing a configuration example of an output system of an audio
signal in the television receiver. In the configuration shown in FIG. 3, the speaker 8 and the
earphone 19 are directly connected to the audio amplifier 71 of the audio signal output unit 7.
Further, the control unit 13 is configured by a microcomputer, and the control unit 13 outputs a
control signal to the audio amplifier 71 in accordance with the switching signal output from the
remote control 14. When the audio amplifier 71 receives the control signal, the audio amplifier
71 outputs an audio signal to a device different from the currently output device. That is, when
the audio amplifier 71 outputs the audio signal to the speaker 8 until receiving the control signal
from the control unit 13, the audio amplifier 71 switches the output destination of the audio
signal from the speaker 8 to the earphone 19 when receiving the control signal. . When the audio
amplifier 71 outputs an audio signal to the earphone 19 until receiving the control signal from
the control unit 13, the audio amplifier 71 switches the output destination of the audio signal
from the earphone 19 to the speaker 8 when receiving the control signal. .
[0045]
The television receiver 1 further includes a plug connection detection unit 16 that detects
whether the plug 19 P of the earphone 19 is connected to the earphone terminal 9, and the
control unit 13 outputs the plug connection detection unit 16. The presence or absence of the
connection of the plug 19P can be detected by the received signal. Therefore, in the television
receiver 1, when the plug 19P of the earphone 19 is not connected to the earphone terminal 9,
the output destination of the audio signal is the speaker 8 even if the control signal for switching
the output destination of the audio signal is detected. Does not switch to the earphone 19.
Therefore, when the earphone 19 is not connected to the television receiver 1, the output
destination of the audio signal is switched to the earphone terminal 9 even if the user operates
the audio signal output destination switching button of the remote control 14, and silence is set.
In addition, when the output destination of the audio signal is switched, the audio can be
prevented from being interrupted.
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[0046]
Furthermore, the audio amplifier 71 has a function of reducing the volume when receiving a
control signal for switching the output destination of the audio signal from the control unit 13 as
in the configuration shown in FIG. The operation of the audio amplifier 71 is the same as that
shown in FIG. This can prevent the surrounding people from being annoyed or hurting the user's
ear.
[0047]
As described above, according to the present invention, by connecting the earphone to the voice
output device in advance and placing the earphone at hand, the voice output can be performed
without attaching or removing the earphone from the voice output device. You can switch ahead.
[0048]
It is a block diagram which shows the main structures of a television receiver.
It is a circuit diagram showing an example of 1 composition of an output system of an audio
signal in a television receiver. It is a circuit diagram showing an example of 1 composition of an
output system of an audio signal in a television receiver.
Explanation of sign
[0049]
1-TV receiver 2A-antenna 2-tuner 4-OSD processing unit 5-video signal output unit 6-display unit
7-audio signal output unit 8-speaker 9-earphone terminal 10-operation unit 11-remote control
signal reception unit 12 -Storage unit 13b-RAM 13a-ROM 13-Control unit 14-Remote control 16Plug connection detection unit 19-Earphone 19P-Plug 71-Audio amplifier
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