JP2015076695

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DESCRIPTION JP2015076695
The present invention provides a voice conversion adapter capable of separating and outputting
stereo sound (second sound) for headphones and mono sound (first sound) for microphone input.
SOLUTION: An L channel audio input terminal, an R channel audio input terminal, an L channel
volume control volume for adjusting and outputting the amplitude of the input L channel audio
signal, and an amplitude of the input R channel audio signal Headphones with R channel volume
control volume to adjust and output, L channel output terminal to output the output signal from
L channel volume control volume, and R channel output terminal to output the output signal
from R channel audio control volume Microphone input having a stereo jack for audio, a
synthesis circuit for mixing and synthesizing the input L channel audio signal and the input R
channel audio signal, and an output terminal for outputting an output signal from the synthesis
circuit as a microphone input It has a monojack for connection. [Selected figure] Figure 1
Voice conversion adapter
[0001]
The present invention relates to a voice conversion adapter, and more particularly to a voice
conversion adapter that is attached to an audio output jack of an aircraft cabin sheet and used to
view in-flight entertainment service using a hand-held headphone (or earphone) or a portable
device.
[0002]
A conversion plug is commercially available for attaching to an audio output jack of an aircraft
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cabin seat and connecting a hand-held headphone or earphone to this to enjoy an on-board audio
program with better sound quality.
FIG. 4 is a view showing an example of a conventional conversion plug 100, and FIG. 5 is a view
showing its internal connection.
[0003]
The conversion plug 100 is, as shown in FIG. 4, an L channel mono plug 10L for inputting an L
channel audio signal to an insulator 50 such as Bakelite, an R channel mono plug 10R for
inputting an R channel audio signal, and headphones Or an earphone) stereo jack 20 is attached,
and as shown in FIG.
[0004]
The L-channel mono plug 10L and the R-channel mono plug are normally configured as a pair of
dual plugs, and the dual plugs are inserted into stereo dual jacks provided on an in-flight seat
(not shown).
Then, the stereo plug 30 connected to the headphone (or earphone) 40 is inserted into the stereo
jack 20 for use.
[0005]
There are also jacks for audio output provided on the in-flight seat that simultaneously supply
not only audio signals but also the power supply voltage etc. Depending on this, many types of
headphone jacks may be prepared. . Patent Document 1 describes a conversion plug that can
handle such various types of headphone jacks.
[0006]
Unexamined-Japanese-Patent No. 2003-264886
[0007]
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Recently, when showing a movie or the like, subtitles or sign language images are displayed on
the screen for the hearing impaired to support watching the movie, or an audio guide is provided
from the speaker for the visually impaired. For people with different cultures and languages,
barrier-free is realized by adding subtitles displayed in multiple different languages, so-called
second screen information to video content .
[0008]
However, for example, when subtitles are included or an audio guide flows from a speaker, for a
healthy person, it becomes rather distracting and unpleasant, and when subtitles are displayed in
a plurality of different languages, it becomes difficult to see an image.
In order to solve the problem associated with such barrier-free, for example, a portable device is
provided to an individual movie viewer and the portable device is caused to display or output
second screen information.
[0009]
The Dutch company Civolution (http://www.civolution.com) offers a second screen solution
"SyncNow" using audio watermarks (http://www.syncnow.com/).
This technology distributes in the frequency band of audible range of audio, embeds various code
information as a watermark, and according to the video scene of the content, the application of
the smart phone or the tablet terminal automatically displays the related information. It is a
thing.
[0010]
Audio watermarks are composed of information that can not be sensed by the human ear, which
is inserted into audio content (files or soundtracks) and has no impact on the audio quality of the
original content. Also, information inserted and embedded in speech as a digital watermark
remains without loss even through signal compression and conversion accompanying signal
transmission. Therefore, while the watermark information is included in the sound coming out of
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the speaker, the smartphone or the tablet terminal can extract this information from the
microphone input.
[0011]
When a movie in which such second screen information is added to voice is screened on board,
the voice is taken out from the voice output jack of the in-flight sheet through the conversion
plug, but this voice is used as a portable device such as a smartphone or a tablet terminal. It is
necessary to carry out division processing into a voice (hereinafter referred to as a first voice)
input to the microphone input terminal and a voice (hereinafter referred to as a second voice) for
headphones (or earphones) going to a person's ear.
[0012]
The passenger who needs the second screen information inputs the first sound into the
microphone input terminal of the portable device, synchronizes with the video scene, and outputs
the second screen information stored in advance in the portable device.
Passengers who do not need second screen information can listen to the second sound on their
headphones (or earphones) as is conventional.
[0013]
However, in the conversion plug shown in FIGS. 4 and 5 currently marketed, the speech can not
be divided into the first speech and the second speech in this manner, and the conversion
described in Patent Document 1 is The plug can not be divided as well. Therefore, in the present
situation, there is a problem that the passenger can not sufficiently watch the movie in which the
second screen information is added to the sound. An object of the present invention is to solve
the above-mentioned problems and to provide a voice conversion adapter capable of dividing and
outputting the first voice and the second voice.
[0014]
The audio conversion adapter according to the present invention is an L channel input terminal
for inputting an L channel audio signal, an R channel input terminal for inputting an R channel
audio signal, and L for adjusting and outputting the amplitude of the input L channel audio
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signal. Channel volume control volume, R channel volume control volume to adjust and output
the amplitude of the input R channel audio signal, L channel output terminal to output the output
signal from L channel volume control volume, and R channel audio control volume A headphone
stereo jack having an R channel output terminal for outputting an output signal from the mixer, a
synthesis circuit for mixing and synthesizing the input L channel audio signal and the input R
channel audio signal, and With an output terminal that outputs the output signal of the
Characterized by comprising a mono jack click input connections.
[0015]
Also, in the voice conversion adapter of the present invention, the synthesis circuit is
characterized by including an attenuator for giving a desired attenuation to the synthesized voice
signal.
Further, the voice conversion adapter according to the present invention is characterized in that
the input L channel audio signal and the input R channel audio signal are input to the synthesis
circuit through a filter circuit for removing noise.
[0016]
Further, the voice conversion adapter according to the present invention is characterized by
further comprising a spare stereo jack having an L channel input terminal and an R channel input
terminal. Furthermore, the voice conversion adapter according to the present invention is
characterized in that a stereo jack for headphones and a mono jack for microphone input
connection are attached to the seat device.
[0017]
According to the voice conversion adapter of the present invention, since the voice can be
divided into the first voice and the second voice, the second screen information can be
appropriately extracted from the voice.
[0018]
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The circuit block diagram of one Example of the voice conversion adapter of this invention.
The circuit block diagram of the other Example of the audio ¦ voice conversion adapter of this
invention. The external view of the voice conversion adapter of this invention. The figure which
shows an example of the conventional conversion plug. The figure which shows the internal wire
connection of the conventional conversion plug.
[0019]
FIG. 1 is a circuit diagram of one embodiment of a voice conversion adapter according to the
present invention. The same parts as those of the conventional conversion plug shown in FIGS. 4
and 5 are designated by the same reference numerals and their detailed description will be
omitted.
[0020]
In the audio conversion adapter 200 of the present invention, an audio signal input from the L
channel mono plug 10L serving as an L channel input terminal is supplied to the L channel
output terminal 20-1 of the headphone stereo jack 20 via the L channel volume control volume
54. It is output. An audio signal input from the R-channel mono plug 10R, which is an R-channel
input terminal, is output to the R-channel output terminal 20-2 of the stereo jack 20 via the Rchannel volume control volume 52. Thus, the second sound is output from the stereo jack 20.
[0021]
Furthermore, the voice conversion adapter 200 of the present invention is provided with a
microphone input connection mono jack 20a for outputting the first voice, and an audio signal
input from the L channel mono plug 10L and an input from the R channel mono plug 10 R are
provided. The voice signal to be input is mixed and synthesized through the synthesis circuit 56,
and is output to the output terminal 20a-1 of the mono jack 20a for microphone input
connection. The synthesis circuit 56 is composed of resistors R1, R2 and R3, performs mixing of
the audio signal by resistance addition by the resistors R1 and R2, and further combines with the
resistor R3 to achieve desired attenuation to the synthesized audio signal. give.
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[0022]
When the second audio signal output to the headphone stereo jack 20 and the first audio signal
output to the microphone input connection mono jack 20 a are simply divided into two, the
passenger who listens only to the second audio Adjust the volume control volume and the
volume control volumes 52 and 54 installed on the cabin seat to the volume that the person
thinks is appropriate, but the adjusted volume is output from the mono jack 20a for microphone
input connection There is a problem that the volume of the first sound is not necessarily
appropriate.
[0023]
In order to solve this, the synthesis circuit 56 is configured as described above.
The configuration of the synthesis circuit including the attenuator is not limited to that shown in
FIG. 1 and can be changed as appropriate. FIG. 2 is a circuit diagram showing another
embodiment of the voice conversion adapter according to the present invention. In the case of
the present embodiment, a filter circuit 58 for removing noise from the L channel audio signal
and the R channel audio signal is provided at the front stage of the synthesis circuit 56 to take
measures against noise. Thus, removing noise from the first audio signal is extremely effective
for detecting digital watermark information from the first audio signal.
[0024]
Also, if necessary, as shown by a broken line in FIG. 1, if a spare stereo jack 60 provided with an
L channel input terminal 60-1 and an R channel input terminal 60-2 is provided, audio signals
from other sound sources are provided. Can be input to improve the usefulness of the voice
conversion adapter. FIG. 3 is an external view of the voice conversion adapter of the present
invention, where (a) is a left side view, (b) is a front view, and (c) is a right side view.
[0025]
Although the above-described embodiment has described the case where the voice conversion
adapter of the present invention is used for movie screening in an aircraft, for example, a multi-
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language synchronization with a video using a voice output terminal such as a general television
or DVD device It can also be used in other applications such as subtitle delivery systems. Also,
digital watermark information is detected from audio such as audio without video and
announcements from stations, airports, shopping centers and theme parks, emergency alert
notification, etc. to deliver video, maps, coupons, multilingual subtitles, etc. It can also be used for
the system.
[0026]
In the above-described embodiment, the voice conversion adapter is illustrated as being
externally attached to a seat device such as an in-flight seat, but is built in the seat device and is a
headphone stereo jack and a microphone input connection mono jack. It is also possible to attach
and use it in a sheet device.
[0027]
10L: L channel mono plug 10 R: R channel mono plug 20: stereo jack 20a for headphones: mono
jack 52 for microphone input connection: R channel volume control volume 54: L channel
volume control volume 56: synthesis circuit 58: filter circuit 60: Spare stereo jack
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