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JP2011003944

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DESCRIPTION JP2011003944
[PROBLEMS] To provide a projector or the like capable of more appropriately outputting sound
in a situation where a plurality of types of sounds can be input and simultaneously output.
SOLUTION: A projector 101 has a microphone input terminal 110 which is a first audio input
unit for inputting a first audio signal, and a line input terminal 120 which is a second audio input
unit for inputting a second audio signal. A speaker amplifier 171 which is a first audio
amplification unit for amplifying the first audio signal to generate a first amplified audio signal;
and a second amplified audio for amplifying the second audio signal. A speaker amplifier unit
172 that is a second audio amplification unit that generates a signal; a microphone speaker 181
that is a first audio output unit that outputs a first audio based on the first amplified audio signal;
It is comprised including the main speaker 182 which is a 2nd audio | voice output part which
outputs a 2nd audio | voice based on a 2nd amplified audio | voice signal. [Selected figure] Figure
2
Projector and audio output method
[0001]
The present invention relates to a projector and an audio output method.
[0002]
In the case of a projector having a microphone input terminal, a line input terminal, and a
speaker, the sound from the microphone input terminal and the sound from the line input
terminal are mixed and output from the speaker.
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1
[0003]
For example, Japanese Patent Laid-Open No. 5-64286 discloses a microphone mixing circuit
including a switch that is turned on when a microphone pin is inserted into a microphone input
terminal, and a circuit that reduces the music level input to the mixer when the switch is turned
on. It is described that it is used to perform distortion-free audio output.
[0004]
Unexamined-Japanese-Patent No. 5-64286
[0005]
However, when the control to reduce the audio output level is performed as in the method of the
above-mentioned publication, sufficient volume may not be obtained even when the user
performs an operation to increase the volume.
This is because, in order to mix a plurality of types of sounds from a plurality of types of input
terminals, the projector or the like needs to assign an output allowable range of a speaker or the
like to each sound.
For example, when a projector or the like assigns half of the output tolerance range to each of
the sound from the microphone input terminal and the sound from the line input terminal, the
sound pressure level of each sound decreases and the user increases the volume. Even when the
operation is performed, sufficient volume can not be obtained.
[0006]
Some aspects according to the present invention provide a projector and an audio output method
capable of more appropriately outputting audio in a situation where a plurality of types of audio
can be input and simultaneously output by solving the above problems. It is.
[0007]
A projector according to one aspect of the present invention includes a first audio input unit for
inputting a first audio signal, a second audio input unit for inputting a second audio signal, and
the first audio signal. A second audio amplification unit for amplifying the second audio signal to
generate a second amplified audio signal, and a first audio amplification unit for generating a
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2
first amplified audio signal by amplifying the second audio signal; A first audio output unit for
outputting a first audio based on the first amplified audio signal; a second audio output unit for
outputting a second audio based on the second amplified audio signal; A determination unit that
determines whether the first audio signal is input by determining whether the first audio signal
or the first amplified audio signal exceeds a threshold.
[0008]
Further, an audio output method according to an aspect of the present invention is an audio
output method in a projector having a first audio output unit and a second audio output unit,
wherein the first audio signal is input. No. 2 voice signal is input, the first voice signal is
amplified to generate a first amplified voice signal, the second voice signal is amplified to
generate a second amplified voice signal, and the second voice signal is generated. It is
determined whether the first audio signal is input by determining whether the first audio signal
or the first amplified audio signal exceeds a threshold, and the first audio signal is input. When it
is determined, the first voice is output to the first voice output unit based on the first amplified
voice signal, and the second voice is output as the second voice based on the second amplified
voice signal. It is characterized by making it output to a voice output part.
[0009]
According to the present invention, even in a situation where a plurality of types of audio can be
input and simultaneously output, the projector can output each audio from different audio output
units, so that the audio can be more appropriately output.
[0010]
Further, a projector which is one aspect of the present invention includes a first audio input unit
for inputting a first audio signal, a second audio input unit for inputting a second audio signal,
and the second audio input unit. A first audio amplification unit for amplifying a right channel
signal or a left channel signal of an audio signal or the first audio signal to generate a first
amplified audio signal; a left channel signal or a right of the second audio signal A second audio
amplification unit for amplifying a channel signal to generate a second amplified audio signal; a
first audio output unit for outputting a first audio based on the first amplified audio signal; And a
second audio output unit that outputs a second audio based on the two amplified audio signals.
[0011]
Further, an audio output method according to an aspect of the present invention is an audio
output method in a projector having a first audio output unit and a second audio output unit,
wherein the first audio signal is input. No. 2 audio signal is input, and when the first audio signal
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is not input, the right channel signal or the left channel signal of the second audio signal is
amplified to generate a first amplified audio signal. When the first audio signal is input, the first
audio signal is amplified to generate the first amplified audio signal, and the left channel signal
or the right channel signal of the second audio signal is generated. Amplifying is performed to
generate a second amplified audio signal, and a first audio is output to the first audio output unit
based on the first amplified audio signal, and a second audio is generated based on the second
amplified audio signal. Output the second voice to the second voice output unit Characterized in
that to.
[0012]
According to the present invention, even in a situation where a plurality of types of audio can be
input and simultaneously output, the projector can output each audio from different audio output
units, so that the audio can be more appropriately output.
[0013]
Further, when the first audio signal is not input, the projector inputs the right channel signal or
the left channel signal of the second audio signal to the first audio amplification unit, and the first
It may include a selection unit that inputs the first audio signal to the first audio amplification
unit when an audio signal is input.
[0014]
According to this, the projector can select the audio signal to be used according to the presence
or absence of the input of the first audio signal.
[0015]
The projector further includes a determination unit that determines whether the first audio signal
is input by determining whether the first audio signal or the first amplified audio signal exceeds a
threshold. May be.
[0016]
According to this, since the projector can determine whether the first audio signal is input
according to whether the audio is actually input, the determination can be performed more
accurately.
[0017]
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In addition, a determination unit may be included to determine whether the first audio signal is
input by detecting contact of a terminal in the first audio input unit.
[0018]
According to this, since the projector can determine whether the first audio signal is input by
detecting the contact of the terminal, the determination can be performed more easily.
[0019]
In addition, the first audio input unit may include a microphone input terminal for inputting a
microphone audio signal from a microphone as the first audio signal.
[0020]
According to this, the projector can more appropriately output the microphone sound when the
microphone sound signal is input.
[0021]
The second audio input unit may include an audio input terminal for inputting an audio signal
from an audio output device as the second audio signal.
[0022]
According to this, the projector can more appropriately output the sound when the sound signal
from the sound output device is input.
[0023]
It is a functional block diagram of the conventional projector.
It is a functional block diagram of a projector in a 1st example.
It is a flowchart which shows the audio | voice output procedure in a 1st Example.
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It is a functional block diagram of a projector in a 2nd example.
It is a flowchart which shows the audio | voice output procedure in a 2nd Example.
[0024]
Hereinafter, an embodiment in which the present invention is applied to a projector will be
described with reference to the drawings.
Note that the examples shown below do not limit the contents of the invention described in the
claims at all.
Further, all the configurations shown in the following embodiments are not necessarily essential
as means for solving the invention described in the claims.
[0025]
First Embodiment FIG. 1 is a functional block diagram of a conventional projector 100. As shown
in FIG.
The projector 100 includes a microphone input terminal 110 connected to a microphone
terminal connected to a microphone, a microphone amplifier unit 112 for amplifying microphone
sound from the microphone input terminal 110, a line input terminal 120, and the microphone
amplifier unit 112. A level detection unit 130 is configured to detect the level of the microphone
sound and to detect the level of the line sound from the line input terminal 120.
[0026]
The projector 100 further includes a gain adjustment unit 150 that adjusts the volume of the
microphone sound, a gain adjustment unit 151 that adjusts the volume of the line sound, and a
gain adjustment unit according to the level detected by the level detection unit 130. 150, a
control unit 140 for controlling the etc., a mixing unit 160 for mixing microphone sound and line
sound, a speaker amplifier unit 170 for amplifying the sound from the mixing unit 160, and a
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main for outputting the sound from the speaker amplifier unit 170 A speaker 180 is included.
[0027]
As described above, the conventional projector 100 may not be able to output an audio of an
appropriate volume because it outputs an audio obtained by mixing the microphone audio and
the line audio.
[0028]
FIG. 2 is a functional block diagram of the projector 101 in the first embodiment.
The projector 101 includes a microphone input terminal 110 which is a first audio input unit, a
microphone amplifier unit 112, a line input terminal 120 which is a second audio input unit, and
a level detection unit 131.
[0029]
In addition, the projector 101 includes a gain adjustment unit 152 that adjusts the volume of the
microphone sound, a gain adjustment unit 153 that adjusts the volume of the line sound, and a
gain adjustment unit according to the level detected by the level detection unit 131. A control
unit 141 for controlling the 152 and the like, a speaker amplifier unit 171 which is a first audio
amplification unit, a speaker amplifier unit 172 which is a second audio amplification unit, and a
microphone speaker 181 which is a first audio output unit. And a main speaker 182 which is a
second audio output unit.
[0030]
The control unit 141 also functions as a determination unit that determines whether the first
audio signal is input by determining whether the level of the microphone audio that is the first
audio signal exceeds a threshold.
[0031]
Also, for example, the level detection unit 131 and the gain adjustment units 152 and 153 may
be a DSP (Digital Signal Processor) or the like that functions as an audio controller, and the
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control unit 141 may be a CPU or the like.
The other parts are general terminals, amplifiers, speakers and the like.
[0032]
Next, an audio output procedure in the projector 101 using these units will be described.
FIG. 3 is a flow chart showing an audio output procedure in the first embodiment.
[0033]
The microphone input terminal 110 inputs a microphone audio signal from the microphone, and
the line input terminal 120, which is a type of audio input terminal for inputting an audio signal
from an external audio output device (for example, a CD player, amplifier, etc.), A line audio
signal is input from the output device (step S1).
The microphone amplifier unit 112 amplifies the microphone sound from the microphone input
terminal 110.
[0034]
The level detection unit 131 detects the sound pressure level of the microphone sound signal
from the microphone amplifier unit 112, and detects the sound pressure level of the line sound
signal from the line input terminal 120 (step S2).
[0035]
The control unit 141 determines whether the sound pressure level of the microphone audio
signal exceeds a threshold (step S3).
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Note that this threshold is, for example, a numerical value that can be identified as human
speech, and is a numerical value that can remove noise.
[0036]
If the sound pressure level of the microphone audio signal exceeds the threshold, the control unit
141 controls the gain adjustment unit 152 to adjust the gain of the microphone audio signal
(step S4), and controls the speaker amplifier unit 171 to perform microphone The audio signal is
amplified (step S5), and the microphone speaker 181 outputs microphone audio based on the
amplified microphone audio signal (step S6).
[0037]
Further, the control unit 141 controls the gain adjustment unit 153 to adjust the gain of the line
audio signal regardless of the sound pressure level of the microphone audio signal (step S7), and
controls the speaker amplifier unit 172 to perform the line audio signal. Are amplified (step S8),
and the main speaker 182 outputs line sound based on the amplified line sound signal (step S9).
[0038]
As described above, according to the present embodiment, the projector 101 can output each
sound from different sound output units even in a situation where multiple types of sounds can
be input and simultaneously output. There is no need to mix the sound internally.
As a result, the projector 101 can ensure a sufficient sound volume and can suppress the
generation of noise noise due to sound switching and the like, so that the sound can be more
appropriately output.
[0039]
Further, according to the present embodiment, the projector 101 can determine whether the
microphone sound is actually input by determining whether the sound pressure level of the
microphone sound signal exceeds the threshold. The determination can be made more
accurately.
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Further, according to the present embodiment, the user can switch between simultaneous output
of the microphone sound and the line sound and output of only the line sound by inserting and
removing the microphone terminal without setting.
[0040]
Second Embodiment In the first embodiment, the projector 101 having a plurality of speakers
has been described. Next, a projector having one speaker will be described.
[0041]
FIG. 4 is a functional block diagram of the projector 102 in the second embodiment.
The projector 102 is configured to include a microphone input terminal 110 that is a first audio
input unit, a microphone amplifier unit 112, a line input terminal 120 that is a second audio
input unit, and a level detection unit 131.
[0042]
In addition, the projector 102 adjusts the volume of the microphone sound, the gain adjustment
unit 155 that adjusts the volume of the line sound, etc., and the gain adjustment unit according
to the level detected by the level detection unit 131, etc. A control unit 142 for controlling the
154 and the like, a speaker amplifier unit 173 which is a first audio amplification unit, a speaker
amplifier unit 174 which is a second audio amplification unit, and a main speaker 183 which is a
first audio output unit , And a second speaker, which is a sound output unit.
The main speaker 183 and the main speaker 184 are integrally configured, and the main speaker
183 normally outputs R sound (sound of the right channel) based on the R sound signal (sound
signal of the right channel). The main speaker 184 is configured to output L voice (voice of the
left channel) based on the L voice signal (voice signal of the left channel).
[0043]
Further, the projector 102 determines the audio signal or gain adjustment of the R channel from
the gain adjustment unit 155 according to the control by the determination unit 190 that
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determines whether the microphone terminal is in contact with the microphone input terminal
110 and the control unit 142 It comprises the selection part 192 which selects the microphone
audio | voice signal from the part 154. FIG.
[0044]
The determination unit 190 may be, for example, a switch, a CPU, or the like, and the selection
unit 192 may be, for example, a selector or the like.
The hardware configuration other than these is the same as that of the first embodiment, so the
description will be omitted.
[0045]
Next, an audio output procedure in the projector 102 using these units will be described.
FIG. 5 is a flow chart showing an audio output procedure in the second embodiment.
[0046]
The microphone input terminal 110 receives a microphone audio signal from the microphone,
and the line input terminal 120 receives a line audio signal (step S11).
The level detection unit 131 detects the sound pressure level of the microphone sound signal
from the microphone amplifier unit 112, and detects the sound pressure level of the line sound
signal from the line input terminal 120 (step S12).
[0047]
The control unit 142 controls the gain adjustment unit 155 to adjust the gain of the line audio
signal (step S13).
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[0048]
The determination unit 190 determines whether the microphone terminal is in contact with the
microphone input terminal 110 using a switch or the like that detects physical contact (step
S14).
[0049]
When the microphone terminal is in contact, the control unit 142 controls the gain adjustment
unit 154 to adjust the gain of the microphone audio signal (step S15), and causes the selection
unit 192 to select the microphone audio signal (step S16). The speaker amplifier unit 173 is
controlled to amplify the microphone audio signal (step S17), and the main speaker 183 outputs
the microphone audio based on the amplified microphone audio signal (step S18).
[0050]
On the other hand, when the microphone terminal is not in contact, the control unit 142 controls
the selection unit 192 to select the R audio signal included in the line audio signal (step S19), and
controls the speaker amplifier unit 173 to perform R audio. The signal is amplified (step S20),
and the main speaker 183 outputs an R sound based on the amplified R sound signal (step S21).
[0051]
Further, the control unit 142 controls the speaker amplifier unit 174 to amplify the L audio
signal included in the line audio signal regardless of the contact of the microphone terminal (step
S22), and the main speaker 184 amplifies the amplified L audio. An L voice is output based on
the signal (step S23).
[0052]
As described above, also in the present embodiment, the projector 102 achieves the same effects
as those of the first embodiment.
For example, when the line audio signal and the microphone audio signal are input, the projector
102 can simultaneously output the microphone audio and the L audio, and when only the line
audio signal is input, the R audio and the L audio can be output. It can be output simultaneously.
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[0053]
Further, according to this embodiment, since the speaker dedicated to the microphone is not
necessary, the manufacturer can manufacture the projector 102 at a lower cost than the first
embodiment.
[0054]
Other Embodiments The application of the present invention is not limited to the abovedescribed embodiments, and various modifications are possible.
For example, the control unit 141 may determine whether the audio signal amplified by the
speaker amplifier unit 171 or the audio signal not amplified by the microphone amplifier unit
112 exceeds a threshold.
[0055]
Further, the number of microphone input terminals 110 and audio input terminals is not limited
to one, and a plurality of terminals may be provided.
Further, the audio input terminal is not limited to the line input terminal 120 which is a stereo
mini terminal, and may be, for example, an RCA terminal configured by an R terminal and an L
terminal, an optical digital audio terminal, or the like.
[0056]
In addition, the projector 101 of the first embodiment may have the determination unit 190 of
the second embodiment, and the projector 102 of the second embodiment may be the first
embodiment instead of the determination unit 190. A determination unit may be included to
determine whether the sound pressure level of the signal exceeds a threshold.
[0057]
In addition, the control unit 141 may control the power supply unit to stop the power supply to
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the speaker amplifier unit 171, the microphone speaker 181, and the like when the microphone
audio signal is not input.
According to this, the projector 101 can operate with less power.
[0058]
Also, the first audio signal and the second audio signal are not limited to the microphone audio
signal and the line audio signal.
For example, the first audio signal may be an audio signal indicating microphone audio converted
into audio data.
[0059]
In the second embodiment, the selection unit 192 may select the microphone audio signal or the
L audio signal, the main speaker 183 may output the R audio, and the main speaker 184 may
output the microphone audio or the L audio.
[0060]
The projectors 101 and 102 are not limited to liquid crystal projectors (transmission type,
reflection type such as LCOS), and may be, for example, projectors using a DMD (Digital
Micromirror Device).
Note that DMD is a trademark of Texas Instruments, Inc., USA.
Also, the functions of the projectors 101 and 102 may be distributed to a plurality of devices (for
example, a PC and a projector).
[0061]
101, 102 projector, 110 microphone input terminal (first voice input unit), 112 microphone
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amplifier unit, 120 line input terminal (second voice input unit, voice input terminal), 131 level
detection unit, 141 control unit (determination Section), 142 control section, 152 to 155 gain
adjustment section, 171, 173 speaker amplifier section (first audio amplification section), 172,
174 speaker amplifier section (second audio amplification section), speaker for 181 microphone
(first Audio output unit 1), 182, 184 main speaker (second audio output unit), 183 main speaker
(first audio output unit), 190 determination unit, 192 selection unit
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