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JPH11164381

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DESCRIPTION JPH11164381
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
digital wireless microphone communication device for indoor and outdoor use.
[0002]
2. Description of the Related Art Conventionally, wireless microphone communication devices
have been used indoors and out. The wireless microphone communication apparatus mainly
comprises a transmitter and a receiver that transmit and receive audio signals. An example of the
configuration of a receiver in a conventional wireless microphone communication device is
shown in FIG.
[0003]
In FIG. 7, the receiver 70 selects selective diversity reception antennas 71 and 72 for receiving
radio waves, radio demodulation units 73 and 74 for demodulating received signals from the
antennas 71 and 72, and demodulated signals. A selection diversity circuit 75 for performing
diversity, an FM detection circuit 76 for performing FM detection on a signal subjected to
selection diversity, an audio signal amplification amplifier 77 for amplifying the detected audio
signal, and an audio signal output for outputting the audio signal The speaker 78 is mainly
configured.
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[0004]
In the receiver having the above configuration, first, the signals received by the antennas 71 and
72 are sent to the radio demodulators 73 and 74, respectively, where they are demodulated and
then sent to the selection diversity circuit 75.
The selection diversity circuit 75 compares the magnitudes of the received powers of the two
signals, selects the demodulated signal with the larger received power, and sends it to the FM
detection circuit 76. The FM detection circuit 76 performs FM detection on the demodulated
signal to extract an audio signal and sends it to the audio signal amplification amplifier 77. The
signal amplified by the audio signal amplifier 77 is output from the audio signal output speaker
78.
[0005]
As can be understood from the above configuration, the conventional wireless microphone
communication apparatus uses an analog modulation / demodulation apparatus that FMmodulates the voice signal as it is, and therefore, a path by space diversity against degradation of
communication quality due to fading or multiple arrival waves. It only makes a choice.
[0006]
At present, with the recent digitization of mobile communication systems, digitization is being
considered in wireless microphone communication devices.
In the study of digitization, there are also many technical issues such as maintenance and
improvement of communication quality, and increase of the number of channels in a limited
frequency band.
[0007]
The wireless microphone communication device is assumed to be used indoors and outdoors, and
in the case of indoor use, in particular, it is necessary to consider a large space such as an
auditorium or a hall. . In such a space, the occurrence of a large number of delayed waves due to
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the reflection of radio waves and the like can not be avoided, which causes a serious problem of
deterioration of communication quality due to these multiple incoming waves.
[0008]
The present invention has been made in view of the above circumstances, and an object of the
present invention is to provide a wireless microphone communication device capable of
improving communication quality by removing delay waves even indoors.
[0009]
[Means for Solving the Problems] In order to solve the above problems, the present invention
takes the following measures.
A digital wireless microphone communication device according to claim 1, an adaptive array
antenna for receiving multiple incoming waves, and a signal processing means for estimating and
separating a desired wave from multiple incoming waves using a signal received from the
adaptive array antenna. And a transmitter for transmitting an audio signal to the receiver.
[0010]
The digital wireless microphone receiver according to claim 3 is an adaptive array antenna that
receives multiple incoming waves, and a signal that estimates and separates desired waves from
multiple incoming waves using a received signal from this adaptive array antenna. And a
processing unit.
[0011]
In the digital wireless microphone communication method according to claim 5, a desired wave is
extracted from a digital reception signal received by the adaptive array antenna, and digital
decoding is performed based on the extracted desired wave signal to obtain an audio signal. Take
the configuration.
[0012]
According to these configurations, it is possible to easily extract the desired wave from the
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multiple incoming waves by digital signal processing.
As a result, it is possible to improve the communication quality due to multiple incoming waves
generated when used indoors.
[0013]
The digital wireless microphone communication device according to claim 2 estimates and
separates desired waves from multiple incoming waves by using a plurality of adaptive array
antennas that receive multiple incoming waves and signals received from each of the adaptive
array antennas. A receiver including a signal processing means, a correction means for adjusting
the output timing of the signals from the signal processing means, and a combining means for
combining the timing-corrected signals, and a transmission for transmitting an audio signal to
the receiver Take a configuration equipped with a machine.
[0014]
The digital wireless microphone receiver according to claim 4 estimates and separates desired
waves from multiple incoming waves by using a plurality of adaptive array antennas that receive
multiple incoming waves, and received signals from the respective adaptive array antennas. A
plurality of signal processing means for performing the processing, correction means for
matching the output timings of the signals from the signal processing means, and combining
means for combining the timing-corrected signals are adopted.
[0015]
The digital wireless microphone communication method according to claim 6 combines output
timings of a plurality of signals obtained by extracting a desired wave from a digital reception
signal received by an adaptive array antenna, and combines a plurality of timing-corrected
signals, Digital decoding is performed based on the synthesized signal to obtain an audio signal.
[0016]
According to these configurations, only desired waves from receivers installed at a plurality of
locations are synthesized and reproduced as a voice signal, so that communication quality by
multiple incoming waves generated at indoor use can be improved to a higher level. .
[0017]
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BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described in detail with reference to the attached drawings.
(Embodiment 1) A digital wireless microphone communication device according to Embodiment
1 receives a received signal with an adaptive array antenna composed of a plurality of elements,
and uses signal processing means based on the received demodulation signal from each antenna
element. The desired wave and the delayed wave are estimated, they are separated, the desired
wave is extracted, and then the extracted desired wave is decoded by the signal decoding means
and reproduced as speech.
[0018]
FIG. 1 is a schematic view showing a configuration of a digital wireless microphone
communication apparatus according to Embodiment 1 of the present invention.
The wireless microphone communication apparatus mainly includes a transmitter 1 and a
receiver 2.
The transmitter 1 includes a microphone 11 which is a voice input terminal, a codec unit 12
which digitally encodes input voice, and a wireless frame creation unit 13 which frames the
output from the codec unit 12 for wireless data transmission; The wireless modulation unit 14
modulates the framed signal to a wireless carrier wave, and the transmission antenna 15 outputs
the wireless modulation signal.
[0019]
The receiver 2 demodulates the wireless modulation signals received by the first to third
antennas 21 to 23 for receiving the wireless modulation signal and the first to third antennas 21
to 23, respectively. Signal processing means 27 for estimating / separating a desired wave using
LMS algorithm based on the demodulated signals from the demodulators 24 to 26 and the first
to third wireless demodulators 24 to 26, and the extracted desired signal It comprises signal
decoding means 28 for decoding and voice-converting waves, an amplification amplifier 29 for
amplifying the voice-converted signal, and a speaker 30 for outputting the voice-converted
signal.
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[0020]
The signal processing means 27 supplies the multipliers 31 to 33 for multiplying the coefficients
W1 to W3 respectively corresponding to the reception demodulation signals D1 to D3 and the
coefficients corresponding to the reception demodulation signals D1 to D3 to the multipliers 31
to 33. Weight control unit 34, first adder 35 for adding (combining) the outputs of multipliers 31
to 33, temporary determination circuit 37 for temporarily determining the combined signal, and
multiplication with reference signal R generated by temporary determination A second adder 36
adds the polarity inversion value of the signal obtained by adding the outputs of the units 31 to
33.
[0021]
Next, the operation of the digital wireless microphone communication apparatus having the
above configuration will be described with reference to FIG. 3 and FIG.
FIG. 3 is a diagram schematically showing the radio wave propagation condition from the
microphone 11 when the digital wireless microphone communication device is installed in the
hole 3.
[0022]
The audio signal input from the microphone 11 is digitally encoded from an analog signal by the
audio codec unit 12 in the transmitter 1, and is sent to the radio frame generation unit 13.
The wireless frame creation unit 13 combines the encoded digital signal sequence with the
wireless transmission information signal (synchronization acquisition signal, transmitter ID, etc.)
preset in the communication apparatus to create a wireless transmission frame. Do.
[0023]
Next, the wireless transmission framed signal is sent to the wireless modulation unit 14,
modulated to a wireless signal, and transmitted from the antenna 15.
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Thus, the signal output from the transmitter 1 is reflected by the wall of the hole 3 in addition to
the direct wave a when it is received by the receiver 2 and delayed waves b that arrive at incident
angles θb and θc, c exists.
These three waves are received by the first to third antennas 21 to 23 in a mixed state.
[0024]
In the first to third antennas 21 to 23, the reception signals are demodulated by the first to third
radio demodulation units 24 to 26, respectively, and the signals are sent to signal processing
means 27 for estimating and separating desired waves. The signal processing means 27 removes
the delay wave by multiplying the reception demodulated signals from the first to third radio
demodulators 24 to 26 with the optimum coefficient according to the LMS algorithm, thereby
removing the desired wave to be a signal. It is sent to the decryption means 28.
[0025]
In the signal processing means 27, first, the reception demodulation signals D1 to D3 from the
first to third radio demodulation units 24 to 26 are multiplied by the multipliers 31 to 33 by the
coefficients W1 to W3 supplied from the weight control unit 34, respectively. Do. In this case, the
respective coefficients W1 to W3 are set corresponding to the reception demodulation signals D1
to D3.
[0026]
Next, the outputs from the multipliers 31 to 33 are added and synthesized by the first adder 35.
Then, the synthesized signal is sent to a temporary determination circuit 37, where temporary
determination is performed to generate a reference signal R.
[0027]
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An error e between the reference signal R and the combined signal is determined by adding the
reference signal R and a signal obtained by inverting the polarity of the combined signal
previously obtained in the second adder 36. The signal of this error e is sent to the weight
control unit 34. The weight control unit 34 updates the coefficient by which the reception
demodulation signal is multiplied so as to reduce the error e. Therefore, the signal processing
means 27 repeats the above series of operations to maintain the error e at the minimum value.
[0028]
The signal decoding means 28 performs digital decoding based on the signal extracted by the
signal processing means 27 and further performs decoding to speech. The decoded audio signal
is amplified by the amplifier 29 and output through the speaker 30. The directivity of the
adaptive array antenna at this time is as shown in FIG. 4 with nulls in the arrival directions of θb
and θc.
[0029]
According to the above configuration, a three-element adaptive array antenna is used, taking
advantage of the characteristic that the directivity (number of elements-1) can have freedom
(null), which is the basic characteristic of the adaptive array antenna. It is possible to generate
nulls in two directions to realize the removal of delayed waves.
[0030]
In the present embodiment, although the LMS algorithm is used as a signal processing means for
estimating and separating a desired wave signal in an adaptive array antenna, the present
invention is not limited to this and can remove a delayed wave. Other adaptive array antenna
control algorithms may be used.
[0031]
(Embodiment 2) A digital wireless microphone communication apparatus according to
Embodiment 2 is provided with a plurality of the adaptive array antennas according to
Embodiment 1 installed, and performs space diversity control by combining adaptive array
antenna signal outputs. .
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That is, each element of each adaptive array antenna installed at a plurality of locations receives
the signal, and the received signal is demodulated by the wireless demodulation unit, and this is
processed by the signal processing means based on the demodulated signal from each antenna
element. And the delayed wave, separate the two, and extract the desired wave.
Furthermore, after matching the timing of the desired wave signal extracted for each adaptive
array antenna, the desired wave signal is synthesized. Thereafter, the synthesized signal is
decoded and reproduced as speech.
[0032]
FIG. 5 is a schematic view showing a configuration of a digital wireless microphone
communication device according to Embodiment 2 of the present invention. The receiver 4 is
composed of three elements each, and cables 45 to 48 for transmitting the signal processing
output of each of the adaptive array antennas and the first to fourth adaptive array antennas 41
to 44 including a wireless modulation unit and a signal processing circuit. Correction means 49
for correcting the signal processing output timing of each adaptive array antenna, combining
means 50 for maximal ratio combining of the signal processing outputs of each of the timing
corrected adaptive array antennas, and an output signal from the combining means And a signal
decoding means 51 for voice conversion, an amplification amplifier 52 for amplifying the voiced
signal, and a speaker 53 for outputting the amplified audio signal.
[0033]
Next, the operation of the digital wireless microphone communication apparatus having the
above configuration will be described with reference to FIG. FIG. 6 is a diagram schematically
showing the radio wave propagation condition from the microphone 11 when the digital wireless
microphone communication device is installed in the hole 3.
[0034]
The audio signal input from the microphone 11 is digitally encoded from an analog signal by the
audio codec unit 12 in the transmitter 1 as in the first embodiment, and sent to the radio frame
creation unit 13 for encoding. A radio transmission frame is created by combining the signal
sequence and the radio transmission information signal set in advance in the communication
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apparatus, modulated to a radio signal by the radio modulation unit 14, and transmitted from the
antenna 15.
[0035]
As can be seen from FIG. 6, when the transmitted signal is received by the first adaptive array
antenna 41 of the receiver 4, the delayed wave e1 reflected by the wall of the hole 3 as well as
the direct wave d1 comes. And f 1 exist, and the three waves are received by the first adaptive
array antenna 41 while being mixed.
[0036]
Similarly, for the other adaptive array antennas 42 to 44, the second adaptive array antenna 42
is received while the direct wave d2, the delayed wave e2 and the delayed wave f2 are mixed, and
the third adaptive array antenna 43 is directly received. The wave d3, the delayed wave e3 and
the delayed wave f3 are received as they are mixed, and the fourth adaptive array antenna is
received as the direct wave d4, the delayed wave e4 and the delayed wave f4 are mixed.
[0037]
The first adaptive array antenna 41 multiplies the reception demodulation signal by an optimal
coefficient according to the LMS algorithm described above to remove the delay wave, extracts
the desired wave, and sends it to the signal combining means 49 through the cable 45. .
Similarly, the other adaptive array antennas 42 to 44 remove the delayed waves from the
respective received signals, extract the desired wave, and send it to the signal timing correction
means 49 through the cables 46 to 48.
[0038]
Since the signal transmission time differs depending on the antenna installation position, the
signal timing correction means 49 holds the required transmission time of each cable measured
in advance as data, and performs correction so that the signal timings from all the antennas
coincide at the time of signal synthesis. .
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After the timing is adjusted by the signal timing correction means 49, maximum ratio synthesis
of four input signals is performed in the signal synthesis means 50.
[0039]
The synthesized signal is sent to the signal decoding means 51 where it is digitally decoded and
further decoded into a speech signal.
The decoded audio signal is amplified by the amplifier 52 and output through the speaker 53.
The adaptive array antennas 41 to 44 at this time have directivity with nulls in the arrival
directions of the respective delayed waves. Thereby, the delay wave can be removed, and only
the desired waves from the receivers installed at a plurality of places are synthesized and
reproduced as an audio signal, so that the communication quality can be improved to a higher
level.
[0040]
In the present embodiment, although the LMS algorithm is used as a signal processing means for
estimating and separating a desired wave signal in an adaptive array antenna, the present
invention is not limited to this and can remove a delayed wave. Other adaptive array antenna
control algorithms may be used.
[0041]
Similarly, in the present embodiment, the case where maximum ratio combining is performed in
the signal combining means 50 is described, but another combining method with spatial diversity
may be used in the signal combining means 50.
[0042]
As described above, the digital wireless microphone communication apparatus according to the
present invention estimates the desired wave and the delayed wave using the adaptive array
antenna for the antenna of the receiver, and separates the both for use at indoor use. It is
possible to prevent the deterioration of communication quality due to the generated multiple
arrival waves.
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Further, by using a plurality of adaptive array antennas, it is possible to further improve the
communication quality.
[0043]
Brief description of the drawings
[0044]
1 is a block diagram showing a configuration of a digital wireless microphone communication
device according to Embodiment 1 of the present invention.
[0045]
2 is a block diagram for explaining the signal processing means of the receiver in the digital
wireless microphone communication apparatus according to the above embodiment.
[0046]
Fig. 3 is a diagram schematically showing radio wave propagation from the microphone when the
digital wireless microphone communication apparatus according to the above embodiment is
installed in a hall.
[0047]
In the digital wireless microphone communication device according to the above embodiment, a
pattern diagram showing directivity by adaptive array antenna control
[0048]
5 is a block diagram showing the configuration of the digital wireless microphone
communication device according to the first embodiment of the present invention.
[0049]
When the digital wireless microphone communication apparatus according to the above
embodiment is installed in a hall, a diagram schematically showing the radio wave propagation
from the microphone
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[0050]
Fig. 7 is a block diagram showing the configuration of the conventional wireless microphone
communication device
[0051]
Explanation of sign
[0052]
DESCRIPTION OF SYMBOLS 1 transmitter 2, 4 receiver 3 Hall 21-23 1st-3rd antenna 24-26 1st3rd radio ¦ wireless demodulation part 27 Signal processing means 28, 51 Signal decoding
means 29, 52 Amplification amplifier 30, 53 Speakers 31 to 33 Multiplier 34 Weight control unit
35 First adder 36 Second adder 37 Temporary decision circuit 41 to 44 First to fourth adaptive
array antennas 45 to 48 Signal transmission cable 49 Signal timing correction means 50 signal
combining means a, d1 to d4 direct waves b, c, e1 to e4, f1 to f4 delayed waves
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