JPS56125671

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DESCRIPTION JPS56125671
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block circuit diagram showing one
embodiment of a microphone switching device according to the present invention, and is a
diagram in which this device is applied as a transmission / reception switching device. FIG. 2 is a
partial schematic perspective view showing a configuration example of the switching device of
the present invention. FIG. 3 is a signal waveform diagram showing the operation of the
apparatus of FIG. FIG. 4 is a schematic block diagram showing another embodiment of the
present invention, which is applied as a transmission / reception switching device as in the case
of FIG. FIG. 5 is a signal waveform diagram showing the operation of the apparatus of FIG. 2:
Microphone element 6: 6: voice signal discrimination circuit 12. 22: proximity switch 10.76: logic
circuit S3: first detection signal S4 and S16: "second detection signal S5 and S15: control signal.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microphone
device V, and in particular to a switching device for bringing the microphone device here into a
desired operating state. 4,-,-(, I-ゝ Yami, microphone device ((If it is, for example, in order to
obtain a desired operating state such as setting the transmission mode, the switching device to
switch the power supply etc. Generally, a manual switch is used. However, such a switch may
require manual operation and may cause operational inconvenience. The purpose of the present
invention is to switch the microphone device to a desired operating state without using manual
operation. It will be possible to provide a switching device which can be carried out and which
does not cause a malfunction of the microphone device due to ambient noise. The invention will
now be described by way of example with reference to FIG. FIG. 1 is a schematic flocking circuit
diagram showing an embodiment of the switching device according to the present invention, in
which case the present device is applied as a switching device for transmission and reception. In
the figure, the microphone element 2 extracts voice vibration based on the talk of the caller as an
electrical voice signal output, and converts the electrical voice Ii 81 into a signal form suitable for
transmitting to the outside by bending. While it is connected to 4 for transmission, if the level of
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the electric voice 2--7 ° and the 7-go-no signal S1 is determined and this is a signal above a
predetermined level, this is added to the microphone element 2 It is connected to an audio signal
discrimination circuit 6 which is pulsed as a first detection signal indicating that it has been
discriminated as a call signal. A voice operation control circuit (hereinafter referred to as a VOX
circuit) 8 disposed downstream of the voice signal discrimination circuit 6 makes it possible to
receive the other party's call when the caller's call is completed, and transmit / receive a call etc.
The state is controlled to a desired state. Then, when the VOX 1 path 8 receives the pulse signal S
2, the DC signal S 3 for generating a predetermined DC signal output S 3 is a logic circuit of the
latter stage, in order to reliably switch the transmission and reception described above. The
proximity switch 12 supplied to one input terminal of the AND circuit (hereinafter referred to as
AND loop name) 10 includes a proximity sensing electrode 14 and is disposed at a
predetermined position in the vicinity of the microphone element 2 Detects that it has
approached the vicinity of the microphone element 2, and applies a second detection signal S4
indicating that the microphone element 2 has approached to the other input terminal of the AND
circuit 10 by six or more. Switching device 16i-1: normally, the input / output terminal 18 is
connected to the receiver 20, or the input / output terminal 18 is connected to the transmitter 4
according to the output of the AND circuit 10, or the input / output terminal The switching
operation of returning 18 to the connection with the receiver 20 is selectively performed, and
the microphone device is set to the transmission mode or the reception mode.
The receiver 20 is provided with a speaker not shown. In the reception mode, an external sound
signal received through the input / output terminal 18 is electroacoustically converted to be
audible. At this time, when the caller talks in close proximity to the microphone element 2, the
voice signal discrimination circuit 6 discriminates this speech, and adds a pulse signal as a first
detection signal to the next stage OX circuit. . Then, the DC signal S6 is sent out from the VOX
circuit 8, and both of the second detection signal S4 sent from the proximity switch 12 to
indicate proximity are simultaneously applied to the AND circuit 10. Then, the AND circuit 10
applies the transmission / reception switching signal S5 to the switch 16. In this case, the
switching device 16 connects the transmitter 4 and the input / output terminals 184, 5 and 5 to
make the microphone device in the transmission mode. FIG. 2 shows the embodiment shown in
FIG. It is a schematic perspective view explaining an example of the device composition to take
over. In the figure, reference numeral O denotes a microphone unit incorporating the
microphone element 2, and reference numeral 40 denotes an audio signal discrimination circuit
6. It is a box that accommodates the VOX circuit 8, the AND circuit 10, the proximity switch 12
and the proximity sensing electrode 14. In the illustrated example, the proximity sensing
electrode 14 is disposed on the side of the box 40 provided separately from the microphone unit
6Q, and detects that the person 50 has approached the microphone unit 60 by a predetermined
distance. Do. Further description will be given with reference to FIG. FIG. 6 is a waveform
diagram showing an operation example of the apparatus of FIG. 1 embodiment. Now, when the
communicator 50 approaches within a predetermined distance with respect to the microphone
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unit 60 at time t1, a first detection signal S4 indicating the proximity of the object is emitted
through the above-described circuit operation 1, and time t2 to t2 It is assumed that the caller 50
makes a call over time t3. Along with this, the DC signal S6 is output from the waiting party 1t2
to t3. Thereafter, when the caller 50 leaves the microphone unit 60 at time t4, the second
detection signal S4 disappears. In the above example, the transmission / reception switching
signal S5 from the AND circuit 10 is output during time t27 or t3. That is, in the device of the
present invention, the transmission / reception switching signal S5 is always generated only in
the presence of both the DC signal S6 and the second detection signal S4, and during this period,
the talker 50 can transmit. As for the adjustment VC, the communicator 50 (/ (: the manual
operation according to: is not successful, and the malfunction can be prevented as shown below).
When ambient noise is input to the microphone unit 30, if noise N to be added to the speech
signal level is generated for some reason, for example, from time t5 to time t6, the DC signal S5 is
generated at time t5 to t6i. Output.
However, the transmission / reception switching signal S5 is not generated because the first
detection signal S4 indicating the proximity of the object is not present. Next, when the person or
object who does not have the purpose of making a call approaches the mark 6-I:; :: mark 9; the
part 50, the proximity of the object is illustrated from time t7 to time t8, for example. In the
second detection-q34 which does not do the above, there is no voice input, contrary to the abovementioned case, so the transmission / reception switching signal S5 is not generated even in such
a case. FIG. 4 is a schematic block circuit diagram showing another embodiment according to the
present invention, which is applied as a transmission / reception switching device as in the
embodiment of FIG. Since the present embodiment also has the same object as the abovedescribed embodiment, the same constituent elements as those of the above-described
embodiment are designated by the same reference numerals, and the description thereof will be
omitted. The proximity switch 22 is different from the proximity switch 12 in the mode of
operation. That is, the proximity switch 22 operates only when the caller 50 approaches the
microphone unit 60. For example, the proximity switch 22 operates when the caller 50
approaches the proximity sensing electrode 24 of the proximity switch 22. I will. Therefore, in
the present embodiment, when the caller 50 approaches the microphone unit 30 at the start and
end of transmission 2), a predetermined distance range different from that in the above
embodiment when the caller 50 separates from the microphone 7 It is one of the requirements to
put a part of the body inside. The flip-flop circuit 26 receives the approaching / separating signal
ST4 generated at the time of the approaching / separating, turns on during that time, and
outputs the detection signal S16 indicating the second close state to the logic circuit 70 of the
subsequent stage. The second AND circuit 60 of the logic circuit 70 receives the detection signal
816 at one input terminal, receives the DC signal S3 at the other input terminal, and cent-resets
the signal S + 7 which is the logical product of the two. This signal is applied to the cent input of
the flip flop circuit 62. The fifth AND circuit 64 receives the Q output of the cent reset flip-flop
circuit 62, that is, the transmission / reception switching signal Si5 at one input terminal,
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receives the detection signal S16 at the other input terminal, and sets the logical product of both
as the reset signal S43. A cent reset flip-flop circuit 62 is applied to the input. The following
operation is the same as that of the apparatus of the first embodiment. FIG. 5 is an 8- ※ 8 1,... In
this embodiment, the transmitting mode is set as the transmission mode at time t2 when the
communicator 50 approaches and starts talking, and then the transmission mode is maintained
even if the call is temporarily interrupted (time t3 to t4). .
Then, after the call ends, at time t6 when the communicator 50 operates to leave, it enters the
reception mode. As in the previous embodiment, the switching signal 515 (... Does not occur even
if there is ambient noise (time t7 to t8) and only the proximity pitch 22 is activated (time t9 to
t10). As a result, according to the present invention, there is provided a switching device that can
switch the microphone device to a desired operating state without requiring manual operation
and does not cause a malfunction due to ambient noise.
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