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JPH07288512

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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
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DESCRIPTION JPH07288512
[0001]
FIELD OF THE INVENTION The present invention relates to wireless microphone devices.
[0002]
2. Description of the Related Art FIG. 4 shows the configuration of a conventional wireless
microphone device. In FIG. 4, 401 is a wireless microphone transmitter, 402 is a receiver, 403 is
an amplifier, and 404 and 405 are speakers. The audio signal transmitted from the wireless
microphone transmitter 401 is received by the receiver 502, amplified by the amplifier 403, and
output from the speakers 404 and 405.
[0003]
However, in the above-mentioned conventional wireless microphone device, even when the
position of the wireless microphone transmitter 401 changes as the user moves, the position of
the sound image output from the speakers 404 and 405 is Because it does not change, there is a
problem that gives the audience an unnatural impression. Also, if a system using radio waves
different from the voice signal is introduced to obtain position information of the wireless
microphone transmitter 401, the device becomes large and the power consumption of the
wireless microphone transmitter 401 increases. There is.
01-05-2019
1
[0004]
The present invention solves the above-mentioned conventional problems, and an object of the
present invention is to provide an excellent wireless microphone device capable of matching the
position of a sound image with the position of a wireless microphone user.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is
called spread spectrum (hereinafter referred to as SS) as a transmission system of digital voice
signals.
Position information of the wireless microphone by the synchronization timing of the spread
code of the SS voice signal received by a plurality of receivers using the above method, and the
position information of the sound image and the position of the user of the wireless microphone
using the obtained position information Sound field control is performed so as to coincide with
each other.
[0006]
Therefore, according to the present invention, the position information of the wireless
microphone can be obtained using the circuit of transmission of the audio signal which is the
original function of the wireless microphone, and the position information of the wireless
microphone is used to position the wireless microphone. Accordingly, natural sounding can be
performed in which the position of the sound image is also moved.
[0007]
The present invention can also obtain diversity effects because it uses a plurality of receivers,
and can move the light of the spotlight following the movement of the wireless microphone user
using the position information of the wireless microphone it can.
Furthermore, by performing code division multiple access in which a plurality of channels are
multiplexed by the difference in spread code of the SS system, a large number of wireless
microphones can be used simultaneously.
01-05-2019
2
[0008]
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows the construction of an
embodiment of the present invention. In FIG. 1, 101 is a clock generation circuit, 102, 103 and
104 are delay circuits, 105 is a time difference calculation circuit, 106 is a coordinate calculation
circuit, 107 is a diversity combining circuit, and each element constitutes a central processing
unit 117. Ru. 108, 109 and 110 are receivers, 111 is a wireless microphone transmitter, 112 is a
sound field controller, 113, 114, 115 and 116 are speakers. Reference numeral 118 denotes a
direction control unit to which the position signal from the central processing unit 117 is input,
and 119 denotes a spotlight which is driven by the direction control unit 118 and causes the
light of the spotlight to follow the movement of the wireless microphone transmitter 111. .
[0009]
Next, the operation of the above embodiment will be described. The wireless microphone
transmitter 111 is attached to the user's body and moves with the user. The radio waves
transmitted from the wireless microphone transmitter 111 and SS-modulated radio waves by
voice information are received by the respective receivers 108, 109 and 110, but during the
synchronization timing of the spread code of the SS signal in each of the receivers 108 to 110.
There is a time difference corresponding to the difference in distance from the wireless
microphone transmitter 111. Here, the absolute timings of the system clocks supplied from
central processing unit 117 to each of receivers 108 to 110 are set in advance according to the
line length from central processing unit 117 so that they coincide between the respective
receivers. It shall be adjusted at 104. In each receiver 108 to 110, the time difference between
the timing of the system clock supplied from the central processing unit 117 and the
synchronization timing of the spread code of the radio wave from the wireless microphone
transmitter 111 is determined. Report to 105. The time difference calculation circuit 105 obtains
the time difference of the synchronization timing of the spread code among the receivers 108 to
110, and using this, the coordinate calculation circuit 106 obtains the position of the wireless
microphone transmitter 111 by the three-square theorem. Can. When the wireless microphone
transmitter 111 moves only on a two-dimensional plane, at least three receivers 108 to 110 are
used, and when the wireless microphone transmitter 111 also moves three-dimensionally in the
height direction, By using at least four receivers of the receivers disposed above and separately
from these receivers 108 to 110, the position of the wireless microphone transmitter 111 can be
determined according to the three-squares theorem. The voice signals from the receivers 108 to
110 are combined by the diversity combining circuit 107 to reduce the influence of noise and
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shadowing. In the sound field control unit 112, the position of the sound image matches the
position of the wireless microphone transmitter 111 using the voice signal after diversity
combination supplied from the central processing unit 117 and the position information of the
wireless microphone transmitter 111. Automatically control the sound field to
[0010]
In addition, the direction control device 118 always lights the user of the wireless microphone
transmitter 111 in the direction of the spotlight 119 by using the position information of the
wireless microphone transmitter 111 obtained by the central processing unit 117 as necessary.
Control so that it hits.
[0011]
FIG. 2 is a block diagram of the wireless microphone transmitter 111. As shown in FIG.
In FIG. 2, 201 is a microphone element, 202 is an A / D conversion circuit, 203 is a multiplication
circuit, 204 is a spread code generation circuit, 205 is a high frequency circuit, and 206 is an
antenna. The audio signal collected by the microphone element 201 is converted to a digital
signal by the A / D conversion circuit 202, spread modulated to an SS signal by the multiplication
circuit 203 and the spread code generation circuit 204, and converted to a carrier band by the
high frequency circuit 205. , Antenna 206.
[0012]
FIG. 3 is a block diagram of the receivers 108-110. In FIG. 3, reference numeral 301 denotes an
antenna, 302 denotes a high frequency circuit, 303 denotes a multiplication circuit, 304 denotes
a spread code generation circuit, and 305 denotes a spread code synchronization circuit. The
signal of the carrier wave band received by the antenna 301 is converted into an SS signal of the
baseband by the high frequency circuit 302, and the SS is demodulated by the multiplication
circuit 303 and the spread code generation circuit 304. The spreading code synchronization
circuit 305 synchronizes the spreading code generated by the spreading code generation circuit
304 with the spreading code included in the received signal and simultaneously acquires the
system clock supplied from the central processing unit 117 and synchronization. The timing of
the spreading code is reported to the central processing unit 117 at any time. The voice signal is
sent as a digital signal to the central processing unit 117, where it is combined with the signals
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4
from other receivers. When multiple wireless microphones are used simultaneously, code
division multiple access can be performed to distinguish the communication channel by the
difference in spreading code.
[0013]
As is apparent from the above embodiment, the present invention can obtain the position
information of the wireless microphone using the circuit of transmission of the audio signal
which is the function of the wireless microphone, and the position information can be obtained.
This has the effect that natural sounding can be performed in which the position of the sound
image also moves according to the position of the wireless microphone.
[0014]
Since the present invention also uses a plurality of receivers, a diversity effect can be obtained,
and the position information of the wireless microphone can be used to move the light of the
spotlight following the movement of the wireless microphone user. Furthermore, by performing
code division multiple access in which channels are multiplexed by the difference in the spread
code of the SS system, a large number of wireless microphones can be used simultaneously.
[0015]
Brief description of the drawings
[0016]
1 is a schematic block diagram of a wireless microphone device in an embodiment of the present
invention
[0017]
Fig. 2 A schematic block diagram of a transmitter in the same device
[0018]
Fig. 3 Schematic block diagram of the receiver in the same device
[0019]
Fig. 4 A schematic block diagram of the conventional wireless microphone device
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[0020]
Explanation of sign
[0021]
101 Clock generation circuit 102, 103, 104 Delay circuit 105 Time difference calculation circuit
106 Coordinate calculation circuit 107 Diversity combining circuit 108, 109, 110 Receiver 111
Wireless microphone transmitter 112 Sound field control device 113, 114, 115, 116 Speaker
118 direction Control device 119 Spotlight 201 Microphone element 202 A / D conversion
circuit 203 Multiplication circuit 204 Spread code generation circuit 205 High frequency circuit
206 Antenna 301 Antenna 302 High frequency circuit 303 Multiplication circuit 304 Spread
code generation circuit 305 Spread code synchronization circuit
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