close

Вход

Забыли?

вход по аккаунту

?

JP2005065169

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2005065169
PROBLEM TO BE SOLVED: To easily perform installation of each device, to simplify the
configuration, and to enable delay-free reproduction by signal processing. SOLUTION: The
millimeter wave receivers 17 to 21 are mounted on the speakers 11 to 15 of the audio
apparatus, and the millimeter wave transmitter 22 is mounted on the super woofer and control
device 16. The superwoofer and the millimeter wave transmitter 22 of the control device 16
convert the audio signals of channel 1 to channel 5 into bit strings by delta sigma modulation,
and wirelessly transmit them to the speakers 11 to 15 as millimeter wave band signals. On the
other hand, in the receivers 17 to 21 of the speakers 11 to 15, the bit string of the corresponding
channel is obtained from the received millimeter wave band signal. Thus, by using delta sigma
modulation and wireless transmission with millimeter wave band signals, it is possible to obtain
an audio apparatus having a simple configuration and no delay due to signal processing.
[Selected figure] Figure 1
Audio Video Wireless Transmission Device
[0001]
The present invention is an audio used in reproducing audio, reproducing video and reproducing
audio and video based on an audio signal, a video signal, an audio signal and a video signal
(hereinafter referred to as an audio video signal). The present invention relates to a video
wireless transmission device.
[0002]
09-05-2019
1
2. Description of the Related Art In recent years, home theaters that reproduce audio signals of a
plurality of channels, such as 5.1 channels, using a plurality of speakers in audio devices have
become widespread (see, for example, Patent Document 1).
An example of the arrangement of speakers in such a home theater is shown in FIG. In FIG. 5, the
system comprises a center speaker 1, front speakers 2 and 3, rear speakers 4 and 5, a super
woofer, and a control device 6.
[0003]
An audio channel is generated for each speaker on the basis of the audio signal in the
superwoofer and control device 6, and an audio signal of a total of 5 channels is sent out to the
center speaker 1 to the rear speaker 5 through the speaker cable 7. Then, a TV monitor (not
shown) is usually installed after the center speaker 1. By doing this, it is possible to enjoy
surround sound from a plurality of speakers while watching the video.
[0004]
However, the home theater having the above configuration has the following problems. That is,
the home theater is often installed in the living room of a general household. However, since the
speakers 1 to 5 and the superwoofer and the control device 6 are connected by wire, it is
necessary to run the speaker cable 7 on the floor, which interferes with the movement of the
caster or the like. There is a problem of Further, in order to connect the rear speakers 4 and 5 to
the superwoofer and the control device 6 with the speaker cable 7, it is necessary to run the
speaker cable 7 across the room, which is particularly problematic.
[0005]
Therefore, it is also conceivable to modulate the audio signal as it is by FM modulation or the like
in the superwoofer and control device 6 and perform wireless transmission to the speakers 1 to
5. However, in an environment where a plurality of devices such as a TV monitor and an
amplifier are concentrated as in the home theater and the like, interference due to unnecessary
radiation from each device becomes a problem, making it difficult to reproduce high-quality
sound. Japanese Patent Application Laid-Open No. 11-215588
09-05-2019
2
[0006]
Therefore, it is an object of the present invention to provide an audio video wireless transmission
device which is easy to install each device in, for example, a home theater, etc., has a simple
configuration, and enables reproduction without delay due to signal processing. is there.
[0007]
In order to solve the above problems, an audio video radio transmission apparatus according to
the present invention comprises: a millimeter wave transmission unit for wirelessly transmitting
a millimeter wave band signal generated based on an audio signal or a video signal or both of the
above signals; And a millimeter wave receiver for receiving the millimeter wave band signal and
recovering the original audio signal and / or the video signal based on the received millimeter
wave band signal. The millimeter wave transmission unit modulates a bit string obtained by
performing delta sigma modulation on the audio signal or the video signal or both of the signals
with a high frequency signal to form a modulation wave, and further, the modulation wave is
After frequency up conversion to the waveband, the obtained millimeter waveband signal is
wirelessly transmitted.
[0008]
According to the above configuration, a bit string formed by delta sigma modulation is wirelessly
transmitted using the millimeter wave band.
Therefore, even if there is a sudden transmission error, the quality is hardly deteriorated, and it
becomes possible to omit the signal processing circuit for error correction etc., so that the
number of digital signal processing circuits is reduced.
In particular, on the receiving side, since all processing except digital switching amplifiers is
analog processing, the configuration of the transmission apparatus is simplified as compared
with a transmission apparatus using pulse code modulation (PCM) or the like, and signal
processing is performed. There is no delay. Therefore, it becomes possible to reproduce the audio
completely synchronized with the video.
[0009]
09-05-2019
3
Further, in the audio video radio transmission apparatus according to one embodiment, the
modulation for forming the modulation wave is any one of digital amplitude modulation (ASK),
digital frequency modulation (FSK) and digital phase modulation (PSK). is there.
[0010]
According to this embodiment, high frequency modulation is performed by the ASK, FSK or PSK
modulation method.
[0011]
In the audio video radio transmission apparatus according to one embodiment, a plurality of
modulated waves having different frequencies are frequency-multiplexed in the modulated wave.
[0012]
According to this embodiment, by multiplexing a plurality of modulated waves having different
frequencies, it becomes possible to transmit a plurality of channels with only one millimeter wave
transmission unit without performing complicated digital signal processing.
[0013]
Also, in the audio-video wireless transmission device according to one embodiment, different
audio channels, different video channels, or different audio channels and video channels are
allocated to each of the plurality of frequency-multiplexed modulated waves. There is.
[0014]
According to this embodiment, a plurality of different audio channels, a plurality of different
video channels, and a different audio channel and video channel are transmitted by only one
millimeter wave transmitter without performing complicated digital signal processing.
[0015]
Further, in the audio-video wireless transmission device according to one embodiment, the
millimeter wave receiving unit frequency-drops the received millimeter wave band signal, and the
different audio channel is allocated to a plurality of frequency-multiplexed modulated waves. The
modulation wave of the desired channel among the video channels is taken out by the band pass
filter and is demodulated to the original bit string.
09-05-2019
4
[0016]
According to this embodiment, since the modulation wave of the desired channel is taken out of
the frequency-multiplexed different audio channel and video channel by the band pass filter, the
modulation waves of a plurality of channels are separated by a very simple device. It becomes
possible to take out.
As a result, reproduction of audio and video without delay due to signal processing is performed.
[0017]
Further, in the audio video radio transmission apparatus according to one embodiment, the
millimeter wave transmission unit is a delta sigma modulation means for performing the delta
sigma modulation, a digital amplitude modulation means for performing modulation with a
plurality of high frequency signals having different frequencies, digital It comprises: any one of
frequency modulation means and digital phase modulation means, combining means for
combining the modulated waves of the plurality of high frequency signals, and a millimeter wave
up-converter for performing the frequency up conversion. .
[0018]
According to this embodiment, a bit string formed by delta sigma modulation is wirelessly
transmitted using a millimeter wave band.
Therefore, the configuration of the transmission apparatus is simplified and there is no delay due
to signal processing as compared with the transmission apparatus using the above-described
PCM and the like.
[0019]
Further, in the audio video radio transmission apparatus according to one embodiment, the
millimeter wave receiving unit is a millimeter wave down converter that performs the frequency
down conversion, and a modulation in which a desired channel is allocated from the plurality of
modulated waves that are frequency multiplexed. A band pass filter for extracting a wave, and
digital amplitude demodulation means for demodulating the extracted modulation wave to an
original bit string, any one of digital frequency demodulation means and digital phase
09-05-2019
5
demodulation means .
[0020]
According to this embodiment, it is possible to separate and extract modulation waves of a
plurality of channels with a very simple device.
[0021]
As apparent from the above, the audio video radio transmission apparatus according to the
present invention wirelessly transmits a bit string obtained by performing delta sigma
modulation by the millimeter wave transmission unit using the millimeter wave band, and
therefore, sudden transmission Errors do not substantially degrade the quality.
Therefore, the signal processing circuit for error correction and the like can be omitted, and the
number of digital signal processing circuits can be reduced.
[0022]
In particular, on the receiving side, since all processing except digital switching amplifier is
analog processing, the configuration of the transmission apparatus can be simplified and the
delay due to signal processing can be eliminated as compared with the transmission apparatus
using PCM etc. .
Therefore, it is possible to reproduce the audio completely synchronized with the video.
[0023]
Hereinafter, the present invention will be described in detail by the illustrated embodiments.
[0024]
-1st Embodiment FIG. 1: shows the structure of the audio apparatus with which the audio video
09-05-2019
6
radio transmission apparatus of this Embodiment was applied.
This audio apparatus is roughly composed of a center speaker 11, front speakers 12 and 13, rear
speakers 14 and 15, a super woofer, and a control device 16.
And the millimeter wave receivers 17-21 are mounted in each speaker 11-15.
In addition, a millimeter wave transmitter 22 is mounted on the super woofer and control device
16.
In the above configuration, in the superwoofer and control device 16, audio channels for the
speakers 11 to 15 are generated, and a millimeter wave band signal is generated based on the
audio signal for each channel.
Then, the millimeter wave band signal 23 is transmitted from the millimeter wave transmitter 22
to the millimeter wave receivers 17 to 21 of the speakers 11 to 15 wirelessly.
[0025]
FIG. 2 shows the configuration of the millimeter wave transmitter 22 and the millimeter wave
receivers 17-21.
The millimeter wave transmitter 22 and the millimeter wave receivers 17 to 21 will be described
in detail below with reference to FIG.
The millimeter wave transmitter 22 comprises a delta sigma modulator 31, an ASK modulator 32,
a combiner 33, a millimeter wave upconverter 34 and a millimeter wave antenna 35. The
millimeter wave receivers 17 to 21 are configured by millimeter wave antennas 36a to 36e,
millimeter wave down converters 37a to 37e, band pass filters 38a to 38e, and demodulators
39a to 39e.
09-05-2019
7
[0026]
Subsequently, an operation of wireless transmission by the millimeter wave transmitter 22 and
the millimeter wave receivers 17 to 21 having the above configuration will be described. First, in
the millimeter wave transmitter 22, audio signals (audio signals) of channel 1 to channel 5 are
converted by the delta sigma modulator 31 into a bit string of 1-bit audio signal at a sampling
rate of 5.6448 MHz, for example. Next, these bit strings are modulated by the ASK modulator 32
on the carriers f1 to f5. Here, it is assumed that the carrier waves f1 to f5 are, for example, 1.1
GHz, 1.2 GHz,. Next, an ASK modulated signal having a center frequency of f1 to f5 is combined
by the combiner 33 and then upconverted by the millimeter wave up converter 34 into a
millimeter wave band signal. For example, assuming that the carrier wave frequency of the
millimeter wave is 59 GHz, the converted millimeter wave band signals f′1 to f′5 have center
frequencies of 60.1 GHz, 60.2 GHz,. The frequency-up converted all millimeter wave band signals
23 are emitted from the millimeter wave antenna 35 into space.
[0027]
Thus, after the millimeter wave band signal 23 emitted to the space is received by the millimeter
wave antenna 36a in the receiver 17, for example, the millimeter wave down converter 37a
lowers the frequency to a modulation signal with a center frequency of f1 to f5. It is converted.
Then, only the signal of the center frequency f1 is extracted by the band pass filter 38a, and is
converted into the original bit string by the ASK demodulator 39a. Similarly, in the receivers 18
to 21, only the necessary channel signals are extracted by the band pass filters 38b to 38e and
converted to the original bit string. The bit string of each channel thus obtained is amplified by a
digital switching amplifier (not shown), converted back to an audio signal by a low pass filter (not
shown), and reproduced by the speakers 11-15.
[0028]
By the way, in the case of transmission using the above-mentioned PCM or the like, an audio
signal or the like is sampled and quantized, and then encoded into multi bits such as 16 bits and
the like and serially transmitted. Thereafter, it is decoded every 16 bits and so on to be converted
back to an analog signal. Therefore, it takes time for signal processing, and the transmitted audio
signal is delayed compared to the original audio signal. On the other hand, in the case of
transmission using delta sigma modulation used in the present embodiment, one bit is converted
simultaneously with sampling of the analog signal. Furthermore, in order to restore the original
09-05-2019
8
analog signal, it is only necessary to pass a low pass filter. Therefore, almost no delay occurs with
respect to the original audio signal. Further, in the bit string formed by delta sigma modulation,
the strength of speech is expressed by the density of bits, and the quality is hardly deteriorated
even if there is a sudden transmission error since there is no need for word synchronization.
[0029]
Also, in wireless transmission, the higher the frequency, the greater the rectilinearity, the less the
influence of diffraction and multipath, and the less the influence of unwanted radiation from
other devices. Therefore, if a bit string formed by delta sigma modulation, which is originally
resistant to sudden transmission errors, is wirelessly transmitted using a millimeter wave band,
signal processing circuits such as error correction can be omitted, and the number of digital
signal processing circuits can be reduced. can do. In particular, on the receiving side, since all
processing except the digital switching amplifier is analog processing, the system configuration is
simplified and there is no delay due to signal processing as compared with the system using the
PCM etc. In the case of applying to etc., it is possible to listen to the audio completely
synchronized with the video.
[0030]
Also, if a bit string formed by delta sigma modulation is transmitted using a frequency band that
is greatly affected by multipath or unwanted radiation, regular or periodic transmission errors
due to the transmission path will increase, causing errors Some signal processing is required to
make corrections, resulting in system complexity and delays. Therefore, by wirelessly
transmitting a bit string formed by delta sigma modulation using a millimeter wave band as in
the present embodiment, it is possible to obtain an audio apparatus having a simple
configuration and no delay due to signal processing. .
[0031]
As described above, in the present embodiment, the millimeter wave receivers 17 to 21 are
mounted on the speakers 11 to 15 of the audio device, and the millimeter wave transmitter 22 is
mounted on the super woofer and the control device 16. . Then, the millimeter wave transmitter
22 of the super woofer and control device 16 converts the audio signals of channel 1 to channel
5 into bit strings by delta sigma modulation, and wirelessly transmits them to the speakers 11 to
09-05-2019
9
15 as millimeter wave band signals. On the other hand, in the receivers 17 to 21 of the speakers
11 to 15, the bit string of the corresponding channel is obtained from the received millimeter
wave band signal. Thus, by using delta sigma modulation and wireless transmission with
millimeter wave band signals, it is possible to obtain an audio apparatus having a simple
configuration and no delay due to signal processing.
[0032]
In the present embodiment, the case of using a millimeter wave band signal with a center
frequency of 60 GHz has been described as an example, but other millimeter wave bands may be
used as long as a band necessary for transmission can be secured. Absent. Further, although the
case of performing the ASK has been described as an example, it is also possible to use other
modulations such as FSK or PSK.
[0033]
Also, in the present embodiment, the case of performing millimeter wave wireless transmission to
all the speakers other than the superwoofer has been described as an example, for example,
millimeter wave wireless transmission is performed only to the rear speaker, and the other
speakers are A combination of wireless and wired may be used, such as wired speaker cables and
wired signal transmission. Furthermore, it is also possible to separate the superwoofer and the
control device and perform wireless transmission to the superwoofer. In addition, a personal
computer capable of 5.1 channel output may be used as the control device.
[0034]
Second Embodiment In the first embodiment, an example in which only voice is wirelessly
transmitted has been described, but in the present embodiment, a case in which audio and video
are simultaneously wirelessly transmitted will be described as an example. .
[0035]
FIG. 3 shows the configuration of a home theater to which the audio video radio transmission
apparatus of the present embodiment is applied.
09-05-2019
10
The difference from the audio device in the first embodiment is that three channels for video
(video channels) are added.
[0036]
The center speaker 41, the front speakers 42 and 43, the rear speakers 44 and 45, the super
woofer and the control device 46, and the millimeter wave receivers 47 to 51 are the center
speaker 11, the front speakers 12 and 13, the rear in the first embodiment. It is the same as the
speakers 14 and 15, the super woofer and control device 16, and the millimeter wave receivers
17 to 21. The millimeter wave transmitter 52 differs in specific configuration and operation from
the millimeter wave transmitter 22 in the first embodiment.
[0037]
In the present embodiment, in addition to the above configuration, the video display device 54 is
provided. The millimeter wave receiver 55 is mounted on the image display device 54. FIG. 4
shows the configuration of the millimeter wave transmitter 52 and the millimeter wave receiver
55. The specific configuration and operation of the millimeter wave receivers 47 to 51 are the
same as those of the millimeter wave receivers 17 to 21 in the first embodiment, and thus the
description thereof will be omitted. Hereinafter, the millimeter wave transmitter 52 and the
millimeter wave receiver 55 will be described in detail according to FIG.
[0038]
The millimeter wave transmitter 52 includes a delta sigma modulator 61, an ASK modulator 62, a
combiner 63, a millimeter wave upconverter 64, and a millimeter wave antenna 65. Delta sigma
modulator 61 and ASK modulator 62 in the present embodiment have three video signals, as
compared to the configurations of delta sigma modulator 31 and ASK modulator 32 in the first
embodiment shown in FIG. A delta sigma modulator and three ASK modulators for video have
been added.
[0039]
On the other hand, the millimeter wave receiver 55 includes a millimeter wave antenna 66, a
09-05-2019
11
millimeter wave down converter 67, a divider 68, band pass filters 69a to 69c, and ASK
demodulators 70a to 70c.
[0040]
Subsequently, an operation of wireless transmission by the millimeter wave transmitter 52 and
the millimeter wave receiver 55 having the above configuration will be described.
First, a delta sigma modulator 61 detects audio signals (audio signals) of five channels and video
signals (video signals) of three channels of Y (luminance signal), Pb (blue color difference signal)
and Pr (red color difference signal). For example, it is converted into a bit string of a 1-bit signal
at a sampling rate of 5.6448 MHz. Next, these bit strings are modulated by the ASK modulator
62 with the carriers f1 to f8. Here, it is assumed that the carrier waves f1 to f8 are, for example,
1.1 GHz, 1.2 GHz,. Next, an ASK modulated signal having a center frequency of f1 to f8 is
combined by the combiner 63 and then upconverted by the millimeter wave up converter 64 into
a millimeter wave band signal. For example, assuming that the carrier frequency of the millimeter
wave is 59 GHz, the converted millimeter wave band signals f′1 to f′8 have center frequencies
of 60.1 GHz, 60.2 GHz,. The frequency-up converted all millimeter wave band signals 53 are
emitted from the millimeter wave antenna 65 into space.
[0041]
Thus, the millimeter wave band signal 53 emitted to the space is received by the millimeter wave
antenna 66 in the millimeter wave receiver 55 of the video display device 54, and the millimeter
wave down converter 67 modulates the center frequency of f1 to f8. Frequency down
conversion. Then, after being divided into three by the divider 68, the band pass filters 69a, 69b,
69c take out the signals of the center frequencies f6, f7, f8, and the signal of the center
frequency f6 is the ASK demodulator 70a, and The signal is converted by the ASK demodulator
70b and the signal of the center frequency f8 into the original bit string by the ASK demodulator
70c. Thereafter, the signals are returned to Y (brightness signal), Pb (blue difference signal), Pr
(red difference signal) by a low pass filter (not shown) or the like, and are sent to the image
display unit (not shown). It is
[0042]
09-05-2019
12
As described above, in the audio video apparatus according to the present embodiment, both the
5-channel audio signal and the 3-channel video signal are subjected to delta sigma modulation by
the superwoofer and the millimeter wave transmitter 52 of the controller 46. It is made to
transmit wirelessly. Therefore, the wiring between the superwoofer and control device 46 and
the center speaker 41, the front speakers 42 and 43, the rear speakers 44 and 45, and the video
display device 54 becomes unnecessary, and the installation of each device becomes easy. Also,
to use delta sigma modulation and wireless transmission with millimeter wave band signals,
digital signal processing is almost unnecessary. Therefore, the system configuration is simplified,
and there is no delay due to signal processing, and it is possible to listen to the audio completely
synchronized with the video.
[0043]
In this embodiment, an example is shown in which Y (luminance signal), Pb (blue difference
signal) and Pr (red difference signal) are used as the video signal. However, in the present
invention, a composite video signal such as National Television System Committee (NTSC) may be
used.
[0044]
Furthermore, with five video channels, delta sigma modulation is performed on all or part of R, G,
and B color signals, horizontal sync signals, and vertical sync signals to form a bit string. It
doesn't matter if you do it. Further, it is also possible to wirelessly transmit only the video signal
and transmit the audio signal by wire. The reverse is also possible. Alternatively, in FIG. 3, the
center speakers 41, the front speakers 42 and 43, and the video display device 54 located near
the superwoofer and the control device 46 are wired transmitted, and the rear speakers 44 and
45 located far away. You may wirelessly transmit to.
[0045]
In each of the above embodiments, the case of wirelessly transmitting only the audio signal
channel and the case of wirelessly transmitting the audio channel and the video channel have
been described, but similarly, only the video channel is wirelessly transmitted. It is also possible.
[0046]
09-05-2019
13
The audio video wireless transmission device of the present invention is useful for reproducing
audio, reproducing video and reproducing audio and video based on audio signals, video signals
and audio video signals, and is used for audio devices and home theaters. can do.
[0047]
It is a figure which shows the structure of the audio apparatus with which the audio video radio |
wireless transmission apparatus of this invention was applied.
It is a figure which shows the specific structure of the millimeter-wave transmitter in FIG. 1, and
the millimeter-wave receiver of each speaker.
It is a figure which shows the structure of the home theater to which the audio video radio |
wireless transmission apparatus of this invention was applied. It is a figure which shows the
concrete structure of the millimeter-wave transmitter in FIG. 3, and the millimeter-wave receiver
of a video display apparatus. It is a figure which shows the structure of the conventional home
theater.
Explanation of sign
[0048]
11, 41: Center speaker, 12, 13, 42, 43: Front speaker, 14, 15, 44, 45: Rear speaker, 16, 46: Super
woofer and control device, 17 to 21, 47 to 51, 55 mm Wave receiver, 22, 52 ... mm-wave
transmitter, 23, 35 ... mm-wave band signal, 31, 61 ... delta sigma modulator, 32, 62 ... ASK
modulator, 33, 63 ... combiner, 34, 64 ... Millimeter wave upconverter, 35, 36, 65, 66 ...
millimeter wave antenna, 37, 67 ... millimeter wave downconverter, 38, 69 ... bandpass filter, 39,
70 ... ASK demodulator, 54 ... video display device, 68 ... Distributor.
09-05-2019
14
Документ
Категория
Без категории
Просмотров
0
Размер файла
25 Кб
Теги
jp2005065169
1/--страниц
Пожаловаться на содержимое документа