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JP2006140866

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DESCRIPTION JP2006140866
The present invention provides an electronic device that can eliminate the inconvenience when
switching the audio output destination from headphones or earphones to a speaker. SOLUTION:
A headphone jack 47 to which a plug 4a of a headphone 4 can be connected, a volume
adjustment unit 42 for adjusting the volume of sound, a detection unit 43 for detecting a
disconnection state between the plug 4a and the headphone jack 47, detection The audio output
switching unit 44 switches the output destination of audio from the headphone jack 47 to the
speaker 46 when the disconnection state is detected by the unit 43, and the volume adjustment
unit 42 detects the disconnection state by the detection unit 43. When the volume of the sound
output to the speaker 46 is larger than the predetermined volume level, the volume is lowered to
the predetermined volume level and the lowered volume is gradually increased. [Selected figure]
Figure 1
Electronics
[0001]
The present invention relates to an electronic device provided with an audio output terminal to
which at least one plug of a headphone and an earphone can be connected.
[0002]
As an electronic apparatus of this type, Japanese Patent Application Laid-Open No. 8-65070
discloses a TV receiver provided with two audio adjustment output circuits for speaker and
headphone.
09-05-2019
1
In this TV receiver, by providing two audio adjustment output circuits, it is possible to
simultaneously output audio from both the speaker and the headphone. In addition, it is possible
to individually adjust the volume of the sound output from the speaker and the volume of the
sound output from the headphone. However, for example, when using headphones in order to
avoid annoyance to the surroundings when viewing a late-night program, it is necessary to not
only adjust the volume for headphones but also to adjust (decrease) the volume for speakers.
Therefore, in this TV receiver, there is a problem that the operation is complicated because it is
necessary to adjust two types of sound volume according to the use situation. As a technology
capable of solving this problem, Japanese Patent Application Laid-Open No. 8-79877 discloses an
audio processing output device capable of separately storing the volume of sound output from a
speaker and the volume of sound output from a headphone. It is disclosed. In this audio
processing output device, since the audio to be output from the speaker and the headphone can
be set individually, when the headphone plug is connected to the external terminal (headphone
jack), the audio is output from the headphone at the volume set for the headphone. When the
plug of the headphone is pulled out from the external terminal, the sound can be output from the
speaker at the volume set for the speaker. Therefore, it is possible to relatively easily switch the
audio output from the headphone and the audio output from the speaker only by inserting and
removing the plug. JP-A-8-65070 (page 3, FIG. 1) JP-A-8-79877 (pages 3-4, FIG. 1)
[0003]
However, the conventional voice processing output device has the following problems. That is, in
the conventional audio processing output device, when the plug of the headphone is pulled out
from the external terminal, the audio is output at the volume set for the speaker. Therefore, for
example, in a state where a large volume is set for a speaker, a television program is viewed at a
small volume using a headphone, and then the plug of the headphone is pulled out from the
external terminal to switch to audio output from the speaker When this happens, a loud sound is
suddenly output from the speaker at a loud volume. In this case, when the user forgets to set the
speaker volume high, the user is surprised due to the sudden output of the high-volume sound. In
addition, when such a situation occurs in the middle of the night, it also causes a great deal of
trouble to the neighborhood.
[0004]
The present invention has been made in view of such problems, and has as its main object to
provide an electronic device that can eliminate the inconvenience when switching the audio
output destination from headphones or earphones to speakers.
09-05-2019
2
[0005]
In order to achieve the above object, the electronic device includes an audio output terminal to
which at least one plug of a headphone and an earphone can be connected, a volume adjustment
unit for adjusting the volume of audio, and a disconnection state between the plug and the audio
output terminal And a switching unit for switching the output destination of the voice from the
voice output terminal to the speaker when the disconnection state is detected by the detection
unit, the volume adjustment unit includes the detection unit Lowers the volume to the
predetermined volume level and gradually increases the reduced volume, when the disconnection
state is detected and the volume of the sound output to the speaker is higher than the
predetermined volume level Let
[0006]
In this electronic device, when the disconnection unit between the headphone or earphone and
the audio output terminal is detected by the detection unit, and the volume of the sound to be
output to the speaker is larger than the predetermined volume level, the volume adjustment unit
The volume is reduced to its predetermined volume level and the reduced volume is gradually
increased.
Therefore, by setting the predetermined volume level to an arbitrary low level, for example, even
if the volume is set high and the audio is listened to using the headphone or the earphone, even if
the plug is pulled out from the audio output terminal. It is possible to reliably prevent a loud
sound from being suddenly output from the speaker.
Therefore, the inconvenience caused by the sudden output of the loud sound from the speaker
can be reliably eliminated.
[0007]
Further, in the electronic device according to the present invention, in the electronic device, the
volume adjuster stops the increase of the volume when the volume of the sound rises to the
volume at the time when the disconnection state is detected. .
[0008]
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3
In this electronic device, the volume adjuster stops the increase of the volume when the volume
of the sound rises to the volume at the time when the disconnection state is detected.
For this reason, it is possible to output the sound from the speaker at the same volume as the
volume at the time of detection of the non-connection state without performing any special
operation.
[0009]
Further, in the electronic device according to the present invention, in the electronic device, the
volume adjusting unit stops the increase of the volume when a predetermined operation is
performed during the increase of the volume.
[0010]
In this electronic device, when a predetermined operation such as an operation of a remote
control is performed while the volume is rising, the volume adjustment unit stops the increase of
the volume.
For this reason, the sound output from the speaker can be set to an arbitrary volume.
[0011]
Hereinafter, the best mode of an electronic device according to the present invention will be
described with reference to the attached drawings. A television 1 (an example of an electronic
device according to the present invention) shown in FIG. 1 is a projection television, and includes
a main unit 2 and a remote control 3. The main unit 2 includes a tuner 11, a broadcast signal
processing unit 12, a display device 13, an acoustic device 14, a light receiving unit 15, and a
main control unit 16.
[0012]
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4
The tuner 11 extracts the broadcast signal Sb of the designated channel from the broadcast wave
received by the antenna outside the figure and outputs the broadcast signal Sb to the broadcast
signal processing unit 12 under the control of the main control unit 16. The broadcast signal
processing unit 12 includes, for example, an IF circuit, an audio detection circuit, a video
detection circuit, an A / D conversion unit (all not shown), and the like. In this case, the broadcast
signal processing unit 12 outputs the video data Dp and the audio data Ds based on the
broadcast signal Sb output from the tuner 11 to the display device 13 and the audio device 14
respectively.
[0013]
The display device 13 includes a display unit 21 and a video output unit 22 as shown in FIG. The
display unit 21 includes an optical engine 31 and a screen panel 32. The optical engine 31 is
disposed inside the main body 2, and projects the projection light L modulated based on the
display signal Se output from the video output unit 22 from the back side of the screen panel 32.
Specifically, the optical engine 31 includes, for example, a light source, a light modulation
element (as one example, a digital micro mirror device or a liquid crystal light valve), and a
projection lens (none of which is shown). In addition, in this television 1, although the projection
light L from the optical engine 31 is actually reflected by a reflective mirror and projected on the
screen panel 32, in order to make an understanding about this invention easy, the illustration
and I omit explanation. The screen panel 32 receives the projection light L projected from the
optical engine 31 and displays an image. The video output unit 22 generates, for example, a
display signal Se for displaying a television video Pt shown in FIG. 2 based on the video data Dp
output from the broadcast signal processing unit 12 under the control of the main control unit
16. Output to the optical engine 31.
[0014]
As shown in FIG. 1, the audio device 14 includes an audio output unit 41, a volume adjustment
unit 42, a detection unit 43, an audio output switching unit 44, a reference volume memory 45, a
speaker 46, and a headphone jack 47. The audio output unit 41 generates an audio signal Ss
based on the audio data Ds output from the broadcast signal processing unit 12 under the
control of the main control unit 16 and outputs the audio signal Ss to the volume adjustment unit
42. Under the control of the main control unit 16, the volume adjustment unit 42 adjusts the
volume (signal level) of the audio signal Ss and outputs the adjusted volume to the audio output
switching unit 44. In this case, the volume adjustment unit 42 controls the volume of the audio
09-05-2019
5
signal Ss, that is, the volume of the sound output from the speaker 46 and the headphone 4 (see
the same drawing) by executing a volume adjustment process described later. The detection unit
43 outputs the detection signal Sd to the volume adjustment unit 42 and the audio output
switching unit 44, for example, when the plug 4a of the headphone 4 shown in FIG. 2 is inserted
into the headphone jack 47 (when connected). When the plug 4a is removed from the headphone
jack 47 (in the non-connected state), the output of the detection signal Sd is stopped.
[0015]
The audio output switching unit 44 (switching unit in the present invention) outputs the audio
signal Ss to one of the speaker 46 and the headphone jack 47 according to the presence or
absence of the output of the detection signal Sd from the detection unit 43. In this case, the audio
output switching unit 44 outputs the audio signal Ss to the headphone jack 47 when the
detection signal Sd is output, and outputs the audio signal Ss from the headphone jack 47 when
the output of the detection signal Sd is stopped. Switch to the speaker 46. The reference volume
memory 45 stores reference volume data Dv in accordance with the control of the main control
unit 16. In this case, for example, when the plug 4a is pulled out of the headphone jack 47 while
watching a program, the reference volume data Dv is set to a predetermined low level to prevent
the loud sound from being suddenly output from the speaker 46. It is data indicating the volume
of a level (a predetermined volume level in the present invention), and is input by the operation
of the remote control 3 as described later. The speaker 46 outputs voice based on the voice
signal Ss. The headphone jack 47 corresponds to the audio output terminal in the present
invention, and is attached to the front panel of the television 1 as shown in FIG. In this case, the
headphone jack 47 outputs the audio signal Ss to the plug 4a, for example, in a state where the
plug 4a of the headphone 4 shown in the figure is inserted (connected).
[0016]
The light receiving unit 15 receives the infrared signal Si output from the remote control 3 and
photoelectrically converts it to output an operation signal So. The main control unit 16 controls
the tuner 11, the broadcast signal processing unit 12, the display device 13, and the sound
device 14 in accordance with the operation signal So output from the light receiving unit 15.
Further, when the reference volume is set by the operation of the remote control 3, the main
control unit 16 generates reference volume data Dv indicating the reference volume and stores
the data in the reference volume memory 45.
09-05-2019
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[0017]
The remote control 3 is formed separately from the main body 2 as shown in FIG. Further, the
remote controller 3 is configured by arranging various switches such as the power switch 51, the
channel switches 52, 52,..., The reference volume setting switch 53, the volume switches 54, 54,
etc. An operation signal corresponding to each switch is converted into an infrared signal Si and
output.
[0018]
Next, the overall operation of the television 1 will be described with reference to the drawings. In
the initial state, it is assumed that the plug 4 a (see FIG. 2) of the headphone 4 is not connected
to the headphone jack 47 of the television 1. In the television 1, when the power switch 51 of the
remote control 3 is operated, power is supplied to the optical engine 31 of the display device 13,
and the light source emits light. Further, the main control unit 16 controls the tuner 11 to extract
the broadcast signal Sb of the channel (for example, the channel CH3) which has been selected at
the time of the previous power-off. Next, the tuner 11 outputs the broadcast signal Sb of the
channel CH3 to the broadcast signal processing unit 12 according to the control of the main
control unit 16. Subsequently, the broadcast signal processing unit 12 outputs the video data Dp
and the audio data Ds based on the broadcast signal Sb to the video output unit 22 of the display
device 13 and the audio output unit 41 of the audio device 14 respectively.
[0019]
Next, the video output unit 22 generates a display signal Se based on the video data Dp and
outputs the display signal Se to the optical engine 31 of the display unit 21. The optical engine
31 modulates the light from the light source into the projection light L based on the display
signal Se and projects the light onto the screen panel 32. Thereby, as shown in FIG. 2, the
television picture Pt of the channel CH3 is displayed on the screen panel 32. Further, the audio
output unit 41 generates an audio signal Ss based on the audio data Ds and outputs the audio
signal Ss to the volume adjustment unit 42. Next, according to the control of the main control
unit 16, the volume adjustment unit 42 adjusts the volume of the audio signal Ss to the volume
level set at the previous power off (for example, amplified) and outputs it to the audio output
switching unit 44 Do. In this case, since the plug 4a of the headphone 4 is not connected to the
headphone jack 47 at this time, the detection unit 43 stops outputting the detection signal Sd.
Therefore, the audio output switching unit 44 outputs the audio signal Ss whose volume is
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7
adjusted by the volume adjustment unit 42 to the speaker 46. Thereby, the voice based on the
voice signal Ss is output from the speaker 46.
[0020]
Next, for example, when listening to sound using the headphone 4 shown in FIG. 2, the plug 4 a
of the headphone 4 is inserted into the headphone jack 47 attached to the front panel of the
television 1. In this case, in the television 1, as described above, when the plug 4a is pulled out
from the headphone jack 47 while watching the program, the standard is used to prevent the
loud sound from being suddenly output from the speaker 46. It is possible to input volume data
Dv. When the reference volume data Dv is input, for example, the reference volume setting
switch 53 of the remote controller 3 shown in FIG. Then, the volume switch 54 is operated to set
the reference volume to an arbitrary low level volume. Subsequently, the reference volume
setting switch 53 is operated again. At this time, the main control unit 16 generates reference
volume data Dv indicating the set reference volume according to the operation signal So and
causes the reference volume memory 45 to store the data.
[0021]
On the other hand, in the audio device 14, when the plug 4a is inserted into the headphone jack
47, the detection unit 43 detects the insertion of the plug 4a and outputs the detection signal Sd
to the volume adjustment unit 42 and the audio output switching unit 44. In response to this, the
audio output switching unit 44 switches the output destination of the audio signal Ss from the
speaker 46 to the headphone jack 47. As a result, the audio signal Ss is output to the plug 4 a
through the headphone jack 47, and audio based on the audio signal Ss is output from the
headphone 4.
[0022]
Subsequently, when the use of the headphone 4 is stopped and sound is output from the speaker
46, the plug 4 a of the headphone 4 is pulled out of the headphone jack 47. At this time, the
detection unit 43 detects removal of the plug 4a and stops the output of the detection signal Sd.
In response to this, the volume adjustment unit 42 reads out the reference volume data Dv from
the reference volume memory 45, and compares the volume level of the audio signal Ss with the
reference volume. In this case, for example, as shown in FIG. 3, when the volume level of the
09-05-2019
8
audio signal Ss at the time when the plug 4a is pulled out (time A shown in the same figure) is
higher than the reference volume, the volume adjustment unit 42 The volume level of the signal
Ss is reduced to the reference volume. On the other hand, the audio output switching unit 44
switches the output destination of the audio signal Ss from the headphone jack 47 to the speaker
46 in response to the output stop of the detection signal Sd. As a result, sound based on the
sound signal Ss is output from the speaker 46 at the reference volume. In this case, since the
volume level of the audio signal Ss (audio to be output to the speaker 46) is reduced to the
reference volume, even when the volume of the audio being listened using the headphone 4 is
large, the plug 4a When pulled out, a loud sound is suddenly output from the speaker 46 and a
situation where the user is surprised is surely prevented.
[0023]
Next, as shown in FIG. 3, the volume adjustment unit 42 has the same level as the volume level of
the audio signal Ss at the time when the plug 4 a is pulled out (when the removal of the plug 4 a
is detected by the detection unit 43). The volume level of the audio signal Ss is gradually raised
until a time point (time B shown in the figure). In this case, for example, when the volume level is
changed by operating the volume switch 54 of the remote control 3 while the volume level of the
audio signal Ss is rising, the volume adjustment unit 42 selects the time (for example, C of FIG. At
the point in time) stopping the rise of the volume level and maintaining the volume level of the
audio signal Ss at the changed volume level.
[0024]
As described above, according to the television 1, when the disconnection portion between the
plug 4 a of the headphone 4 and the headphone jack 47 is detected by the detection unit 43 and
the volume level of the sound output to the speaker 46 is larger than the reference volume. By
setting the reference volume to an arbitrary low level, for example, the volume adjustment unit
42 lowers the volume level of the audio to the reference volume and gradually raises the lowered
volume level. Even when the plug 4a of the headphone 4 is pulled out from the headphone jack
47 in a state where the setting is large and the headphone 4 is used to listen to the program
sound, the loud sound is suddenly output from the speaker 46 reliably. It can be prevented.
Therefore, it is possible to reliably eliminate the inconvenience caused by the loud sound being
output from the speaker 46 suddenly.
[0025]
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In addition, when the volume level of the sound being raised rises to the volume at the time of
removal of the plug 4a (at the time of detection of removal of the plug 4a by the detection unit
43), the volume adjustment unit 42 stops the increase in volume level Thus, the voice can be
output from the speaker 46 at the same volume as the volume at the time of removal of the plug
4a without performing any special operation.
[0026]
In addition, when the volume switch 54 of the remote controller 3 is operated while the volume
is rising, the volume adjustment unit 42 stops the increase of the volume level to set the sound
output from the speaker 46 to an arbitrary volume. it can.
[0027]
The present invention is not limited to the above configuration.
For example, although an example in which the display unit 21 is configured by including the
optical engine 31 and the screen panel 32 has been described above, a CRT, a liquid crystal
display panel, a plasma display, or the like can be adopted as the display unit.
Further, although the example in which the headphone 4 is used is described above, an earphone
may be used instead of the headphone 4. Further, although the television 1 including the speaker
46 has been described as an example, the present invention may be applied to a television of a
type that outputs sound from an external speaker without necessarily including the speaker.
Furthermore, the present invention can be applied to various electronic devices such as audio
devices such as stereos and radios, AV devices such as VTRs and DVD playback devices, and
personal computers capable of audio output, not limited to televisions.
[0028]
FIG. 2 is a block diagram showing the configuration of the television 1; FIG. 5 is a front view of
the television 1 and the headphone 4; FIG. 7 is a transition diagram showing temporal changes in
volume level of an audio signal Ss (audio).
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Explanation of sign
[0029]
1 TV, 4 headphones, 4a plug, 42 volume adjustment unit, 43 detection unit, 44 audio output
switching unit, 46 speakers, 47 headphone jacks
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