close

Вход

Забыли?

вход по аккаунту

?

JPH10200986

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 JPH10200986
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
howling preventing apparatus for preventing the occurrence of howling in a broadcasting facility
such as a building yard.
[0002]
2. Description of the Related Art Some of the above-mentioned broadcasting facilities are capable
of call broadcasting. This is provided with a plurality of microphones, and is configured to be
able to input broadcast sound (announcement sound) from any of these microphones, and is
widely used in, for example, supermarkets, factories, hospitals, etc., and for emergency
broadcasts It is also applied to equipment. As such a broadcast facility, for example, the one
shown in FIG. 6 is known.
[0003]
The broadcast facility shown in the figure is, for example, configured for a supermarket, and as
shown in the figure, the broadcast facility has, for example, the main unit 1 installed in an office.
The parent device 1 includes a parent device microphone 11, and the output of the parent device
microphone 11 is connected to the input side of the switching circuit 12 in the parent device 1.
Further, on the input side of the switching circuit 12, in addition to the above-mentioned parent
03-05-2019
1
device microphone 11, a plurality of sub-device microphones 2, 2,... Installed at appropriate
places in the sales floor are also connected. Detects the microphones in use (that is, the
announcement is input) among these microphones 11 and 2, 2, ..., and an audio signal obtained
from the microphones is an amplifier in the base unit 1 Supply to 13. The amplifier 13 amplifies
the audio signal supplied from the switching circuit 12 to a predetermined level, and then
amplifies the audio signal through the speaker line 14 to a plurality of speakers 3, 3,. Supply to
each. Each of the microphones 11, 2, 2,... Is, for example, a telephone type equipped with a
receiver (not shown), and the hook switch (not shown) is turned on when the receiver is lifted in
use. This state is transmitted to the switching circuit 12 as to which microphone is in use.
[0004]
By the way, in the broadcasting equipment configured as described above, when an
announcement is made using any of the sub-unit microphones 2, 2, ... installed in the sales floor,
the microphones in use 2 However, there is a problem that the loud sound of the speaker 3
located in the vicinity (upper side) is picked up, and howling occurs by this.
[0005]
Therefore, conventionally, for example, as shown in FIG. 7, the speakers located in the vicinity
(above) of the microphones 2, 2,... (In FIG. For the speakers 3), 3),..., Attenuators 101, 101,... Are
provided at the respective input terminals, and the loudness sound levels of these speakers 3, 3.
By lowering in advance, the occurrence of howling is suppressed.
However, according to this configuration, when the level of the signal itself supplied to each of
the speakers 3, 3,... (That is, the output level of the amplifier 13) becomes large, the occurrence
of howling can not be suppressed. .. Are not provided with the attenuators 101, 101,... (In the
same figure, speakers located at the second, fourth, and sixth positions from the office side) 3, 3,.
It is also conceivable that the sound jumps into the microphone 2 in use, which may cause
howling. Furthermore, there is a problem that a sufficient loud sound level can not be obtained
from the speakers 3, 3,... Provided with the attenuators 101, 101,.
[0006]
Also, in the howling measure shown in FIG. 7, it is necessary to provide attenuators 101, 101,...
On the speakers 3, 3,... Installed on the ceiling 10. This measure is shown in FIG. There is a
03-05-2019
2
problem that the construction becomes large-scale if it tries to carry out to the unprepared
measures. And this problem becomes remarkable as the number of required attenuators 101,
101,... Increases.
[0007]
On the other hand, as another conventional example different from the above-mentioned FIG. 7,
there is one as shown in FIG. 8, for example. This is because the switches 102, 102,... Which open
and close between the input terminals of the speakers 3, 3,... Located near the microphones 2, 2,.
, And the switches 102, 102,... So that sound is not amplified from the speaker 3 located in the
vicinity of the microphone 2 (in the figure, the microphone closest to the office side) 2 in use.
The switching circuit 12 controls the opening and closing of the circuit. However, even in this
configuration, as in the case of the broadcast facility of FIG. 7 described above, the loud sound of
other speakers (second and subsequent speakers counted from the office side in FIG. 7) is in use.
Into the microphone 2 of the microphone, which may cause howling.
[0008]
Further, in the howling countermeasure shown in FIG. 8, it is necessary to provide switches 102,
102,... On the speakers 3, 3,... Installed on the ceiling 10 as in the countermeasure shown in FIG.
Furthermore, the signal line 103 for sending the switching control signal to each of the switches
102, 102,... Must be wired, which complicates the configuration and increases the cost of the
facility. There is. Therefore, if it is attempted to apply this measure to the unprepared broadcast
facility shown in FIG. 6, much more extensive construction is required than the measure shown
in FIG. Needless to say, this problem becomes more pronounced as the number of speakers 3, 3,...
Increases.
[0009]
The problem to be solved by the present invention is each problem in the above-mentioned prior
art, that is, howling prevention can be reliably prevented by the simple and inexpensive
constitution. It is about to realize the device.
[0010]
SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the invention
according to claim 1 of the present invention is a microphone for converting input voice into a
03-05-2019
3
voice signal, and a state of use of the microphone Detection means for detecting whether or not
the microphone is in use and outputting a detection signal when the microphone is in use, and
outputting a first control signal when the detection signal is being output, the detection signal
being A control means for outputting a second control signal when in a non-output state, an
input terminal to which the audio signal is input, an output terminal, and a control terminal are
provided, and the first control signal is supplied to the control terminal. When supplied, the audio
signal input through the input terminal is stored, and when the second control signal is supplied
to the control terminal, the second control signal is supplied immediately before being supplied.
First control signal A storage means for outputting from the output terminal an audio signal
stored by the supply, and a speaker for receiving the signal output from the output terminal of
the storage means and converting the input signal into sound and expanding the sound It is
equipped.
[0011]
That is, when voice is input to the microphone, the detection means outputs a detection signal.
Then, the control means outputs the first control signal when the detection signal is in the output
state, that is, when the voice is input to the microphone, and accordingly, the storage means
outputs the signal from the microphone Audio signals to be stored sequentially.
Then, when the voice input to the microphone, i.e., the use of the microphone ends and is not in
use, the detection signal is not output. As described above, when the detection signal is not
output, the control means outputs the second control signal, and in response to this, the storage
means sequentially outputs the voice signal stored previously. The audio signal output from the
storage means is supplied to a speaker, where it is converted to sound and is amplified. That is,
according to the first aspect of the present invention, the voice input to the microphone is
temporarily stored (recorded) in the storage means, and after the use of the microphone is
finished, the voice is amplified (reproduced) from the speaker. Thus, when using a microphone,
the speaker does not amplify the sound.
[0012]
The invention according to claim 2 detects a microphone for converting input voice into an audio
signal, detects whether the microphone is in use, and outputs a detection signal when the
microphone is in use. Detection means, and outputs the first control signal until the
predetermined time elapses, when the detection signal is being output and the state where the
03-05-2019
4
detection signal is being output is changed to the non-output state. And controlling that the
second control signal is output after the predetermined time elapses after transition from the
state where the detection signal is output to the non-output state and the detection signal is in
the non-output state. Means, an input terminal to which the audio signal is input, an output
terminal, and a control terminal, and when the first control signal is supplied to the control
terminal, the signal is input via the input terminal Above audio signal When the second control
signal is supplied to the control terminal, an audio signal stored by the supply of the first control
signal immediately before the second control signal is supplied from the output terminal A
storage means for outputting, and a speaker for receiving a signal output from the output
terminal of the storage means, converting the input signal into sound and expanding the sound
are included.
[0013]
That is, when voice is input to the microphone, the detection means outputs a detection signal.
Then, when the detection signal is in the output state, and the detection signal is not output, the
control means continues to output the first control signal until the predetermined time elapses,
and the storage means While the first control signal is output, the audio signal output from the
microphone is sequentially stored. When no sound is input to the microphone, the detection
signal is not output. As described above, when the predetermined time elapses after the detection
signal is not output and the detection signal is not output, the control means outputs the second
control signal, and accordingly, The storage means outputs the voice signal stored previously.
However, if the detection signal is output again while the detection signal is not output until the
predetermined time elapses, the control means continues to output the first control signal, That
is, the storage means keeps storing the audio signal. The audio signal output from the storage
unit when the control unit outputs the second control signal is supplied to the speaker, where it
is converted to sound and is amplified.
[0014]
That is, according to the second aspect of the present invention, as in the first aspect of the
present invention, the voice input to the microphone is temporarily stored in the storage means,
and after the use of the microphone is finished, Loud from the speaker. Thus, when using a
microphone, the speaker does not amplify the sound. The invention according to claim 2 differs
from the invention according to claim 1 in the following points.
03-05-2019
5
[0015]
That is, for example, when the first control signal is newly input to its control terminal, the
storage means interrupts this even if it is still in the middle of reproducing the audio signal at
that time, It is assumed that it is configured to erase all stored contents stored up to then and to
re-store (i.e., overwrite) an audio signal newly input through the input terminal. Then, for
example, it is assumed that the user of the microphone (announcer) uses the microphone again
immediately after having once stopped using the microphone and has forgotten to say anything.
In this case, according to the invention set forth in claim 1, the voice signal stored in the storage
means is reproduced immediately after the announcer temporarily finishes using the
microphone, but the point in time when the announcer uses the microphone again Then, the
reproduction is interrupted, and the contents stored in the storage means at that time are all
erased, including the unreproduced ones, and the reproduction will not be performed again.
[0016]
On the other hand, according to the second aspect of the present invention, even if the
announcer finishes using the microphone once, the storage operation to the storage means is
continued until the predetermined time elapses. . Then, if the announcer uses the microphone
again before the predetermined time elapses, the storage operation is continued thereafter.
Therefore, even if the use of the microphone is interrupted during voice storage, the contents
stored in the storage means will not be erased if the interruption time is within the abovementioned predetermined time. Therefore, the disadvantages in the invention described in claim
1 as described above can be eliminated.
[0017]
The above-mentioned inconvenience is caused by the use of each of the microphones 2, 2,... By
mechanical switches such as a hook switch as in the case of the telephone type microphones 2,
2,. It may also occur if it indicates whether it is medium or not. That is, the mechanical switch as
described above may cause mechanical vibration (chattering) when the on / off operation is
performed, and this chattering detects whether or not the microphone is in use. Output is
unstable. Therefore, in this case, according to the invention of claim 1, when the use of the
microphone is finished (for example, when the hook switch is turned off), it is recognized that the
03-05-2019
6
microphone is used again by the chattering. As a result, instead of reproducing the sound stored
in the storage means, the stored contents are immediately erased before the reproduction is
performed, that is, the sound can not be reproduced. Needless to say, according to the second
aspect of the present invention, the influence of the chattering can be prevented.
[0018]
According to the invention of claim 3, in the howling preventing apparatus of the invention
according to claim 1 or 2, the detection means is in the first state when the audio signal is output
from the microphone, and the audio is Sound pressure switch means which switches to a second
state when the signal is in a non-output state, and the detection signal when the sound pressure
switch means is in the first state, the sound pressure switch means And detection signal output
means for setting the detection signal in the non-output state when switched to the second state.
[0019]
That is, the sound pressure switch means switches to the first and second states according to the
presence or absence of the audio signal output from the microphone.
Then, when the sound pressure switch means is in the first state, the detection signal generation
means outputs a detection signal on the assumption that the microphone is used. On the other
hand, when the sound pressure switch is in the second state, no detection signal is output,
assuming that the microphone is not in use. That is, according to the third aspect of the present
invention, whether or not the microphone is in use is detected based on the presence or absence
of the audio signal output from the microphone.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a howling preventing
device according to the present invention, which is applied to, for example, a broadcasting facility
for a supermarket, will be described with reference to FIGS. 1 to 5. FIG. In the present
embodiment, as shown in FIG. 1, in the above-described broadcast facility shown in FIG. 6, a new
circuit is provided between the output side of switching circuit 12 in base unit 1 and the input
side of amplifier 13. The memory unit 4 is provided, and the configuration other than this is the
same as that shown in FIG. Therefore, parts equivalent to those in FIG. 6 are given the same
reference numerals, and detailed descriptions thereof will be omitted.
03-05-2019
7
[0021]
That is, as shown in FIG. 1, the newly provided memory unit 4 is composed of an audio memory
5 and a memory control circuit 6. Among them, the voice memory 5 is, for example, a commonly
known voice memory similar to that used for message storage in an answering machine or the
like, and temporarily stores the voice signal output from the switching circuit 12. Remember to
On the other hand, the memory control circuit 6 controls the writing (storage) of data to the
voice memory 5 and the reading (reproduction) of this data, and the presence or absence of the
output from the switching circuit 12, that is, each microphone 11, 2, 2 Control of the voice
memory 5 is performed according to the presence or absence of the voice signal from. Details of
the voice memory 5 and the memory control circuit 6 will be described with reference to FIG.
[0022]
As shown in the figure, the voice memory 5 includes input terminals 51 and 51 connected to the
output side of the switching circuit 12, output terminals 52 and 52 connected to the input side of
the amplifier 13, and the memory control circuit 6. And control terminals 53, 53 and 54, 54 for
write (REC) and read (PLAY) control. Then, for example, when the control terminals 53 for write
control are short-circuited with each other, the audio memory 5 sequentially stores audio signals
input via the input terminals 51, 51 during that time. On the contrary, when the control
terminals 53, 53 are in the open state, the writing operation of the audio signal is ended. The
voice memory 5 continues to store the voice signal once stored until the control terminals 53, 53
are short-circuited again. When the control terminals 53 and 53 are short-circuited again, all the
audio signals stored so far are erased at that time, and the audio signals input via the input
terminals 51 and 51 are Start to remember anew.
[0023]
On the other hand, with regard to the control terminals 54 and 54 for read control, when these
are short-circuited with each other, the voice memory 5 catches the moment of the short circuit,
and at that time all the voice memories 5 stored in the voice memory 5 Audio signals are
sequentially output from the output terminals 52, 52. Since the voice memory 5 captures only
the moment of the short circuit when reading out the voice signal, the control terminals 54 are
continuously short-circuited until all the voice signals are read out. There is no need to leave.
03-05-2019
8
That is, in order to read out an audio signal from the audio memory 5, the control terminals 54
may be short-circuited only for an instant.
[0024]
Since the voice signal is generally an analog signal, the voice memory 5 actually stores the analog
voice signal after converting it into digital data. Further, when reading out the stored digital data,
it is converted into an analog signal and then output from the output terminals 52, 52. For this
reason, the voice memory 5 incorporates an A / D converter and a D / A converter (not shown)
on the input side and the output side, respectively. The storage time T of voice data in the voice
memory 5 depends on, for example, the storage capacity of the semiconductor memory itself
constituting the voice memory 5, but in this case, the storage time T is T = maximum 20 seconds.
You are using a large amount of memory. The voice memory 5 corresponds to the storage means
described in the claims.
[0025]
On the other hand, the memory control circuit 6 incorporates a drive circuit 60 to which an
audio signal is input from the switching circuit 12. The drive circuit 60 detects the presence or
absence of the audio signal, and generates a signal serving as an operation reference of the
memory control circuit 6 based on the detection result. For example, as shown in FIG. It is
configured as shown.
[0026]
That is, the drive circuit 60 has a sound pressure switch 60a that opens and closes in accordance
with the presence or absence of the audio signal. Note that the sound pressure switch 60a has
high (H) level and low (L) level (L = 0 [V, depending on the open / close state (presence or
absence of an audio signal), as shown in FIG. ] To output a binary voltage. The drive circuit 60
also includes an integration circuit 60b that integrates the output of the sound pressure switch
60a with a relatively large time constant, and a saturation amplifier that amplifies the output of
the integration circuit 60b at an infinite amplification factor (for example, An open loop amplifier
60c is provided, and the output of the saturation amplifier 60c is output through a buffer
amplifier 60d.
03-05-2019
9
[0027]
Therefore, in the drive circuit 60, when the output of the sound pressure switch 60a is such that
the audio signal is interrupted for a time τ on the way as shown in FIG. 3B, for example, this is
integrated by the integration circuit 60b. By doing this, for example, as shown in FIG. 6C, a signal
in which each rising and falling of the signal is blunted is obtained. Then, when the output of the
integration circuit 60b is amplified by the saturation amplifier 60c, the output is, for example, 0
[V] where the output of the integration circuit 60b is 0 [V] as shown in FIG. 3 (d). The remaining
part is the saturation level Emax. Therefore, when the time τ of the break portion of the audio
signal is relatively short, the break portion does not appear at the output of the saturation
amplifier 60c. Even after the audio signal is not completely output, the saturation amplifier 60c
outputs a signal of the saturation level Emax for a time t corresponding to the time constant of
the integration circuit 60b, for example, about t = 2 seconds. Be done. Therefore, as shown in FIG.
3 (e), the input of the audio signal is completely eliminated after the audio signal is input from
the buffer amplifier 60d to which the output of the saturation amplifier 60c is input and hence
the drive circuit 60. A voltage having a predetermined level E is output until the time t elapses.
[0028]
The output voltage E of the drive circuit 60 is supplied to an electromagnet (coil) 61 a of a relay
61 provided in the memory control circuit 6. The relay 61 simultaneously controls the two open
/ close portions 61b and 61c by one electromagnet 61a, and the open / close portions 61b and
61c are a common (C) contact, a make (M) contact, and a break (B) contact, respectively. The socalled c contact type is provided with three terminals. That is, when the voltage E is supplied
from the drive circuit 60 to the electromagnet 61a of the relay 61, the common contact and the
make contact of each of the switching units 61b and 61c are short-circuited (FIG. 2 shows this
state) ing.). When the voltage E is not supplied to the electromagnet 61a, the common contact
and the break contact of each of the opening and closing parts 61b and 61c are shorted.
Therefore, the voltage E output from the drive circuit 60 is set to a voltage level sufficient to
drive the relay 61.
[0029]
The common contact and the make contact of one of the two opening and closing parts 61b and
61c, for example, the opening and closing part 61b, are connected to the control terminals 53 for
03-05-2019
10
writing control of the audio memory 5, respectively. Break contact is open (no connection). That
is, when the voltage E is output from the drive circuit 60, that is, when an audio is input to any
one of the microphones 11, 2, 2,..., The control terminals 53, 53 are short-circuited with each
other. Thus, the data write operation of the voice memory 5 is started. When the voltage E is not
supplied, that is, when the time t elapses after the microphones 11, 2, 2,... Are not in use, the
control terminals 53, 53 are open. As a result, the data write operation of the voice memory 5 is
discontinued.
[0030]
Then, for the other switching part 61c, the common contact is connected to one end of the
capacitor 62, the make contact is connected to the anode side of the DC power supply 63, for
example, and the break contact is an electromagnet of the relay 64 other than the relay 61 ) Is
connected to one end of 64a. The other end of the capacitor 62, the cathode side of the DC
power supply 63, and the other end of the electromagnet 64a of the relay 64 are connected to
each other. Further, the relay 64 has a so-called a contact type switching part 64b which shorts
(that is, makes) between two contacts when current flows through the electromagnet 64a. It is
connected to control terminals 54 and 54 for read control.
[0031]
That is, in the state in which the voice is input to any of the microphones 11, 2, 2,..., And until the
time t elapses after the voice is not input, Since the common contact and the make contact shortcircuit, a series circuit of the DC power supply 63 and the capacitor 62 is formed, and the
capacitor 62 is charged as indicated by a plus (plus) symbol in FIG. In this state, each contact of
the opening / closing portion 64b of the relay 64, that is, between the control terminals 54 and
54 for read control of the audio memory 5 is in an open state. When the time t elapses after each
of the microphones 11, 2, 2,... Is in the non-use state, the common contact and the break contact
of the open / close portion 61c are shorted. A series circuit of the relay 64 and the electromagnet
64a of the relay 64 is formed, whereby the capacitor 62 charged earlier is discharged and a
current flows in the electromagnet 64a. As a result, since the respective contacts of the open /
close portion 64b of the relay 64 are short-circuited, the control terminals 54 for reading control
of the audio memory 5 are short-circuited. In addition, since the discharge time of the capacitor |
condenser 62 is very short, the short circuit between each contact of the said switching part 64b
will be momentary. Accordingly, the control terminals 54 are also short-circuited for a very short
time w, that is, only for a moment.
03-05-2019
11
[0032]
When the control terminals 54, 54 for reading control are shorted, as described above, the voice
memory 5 catches the moment of the short and thereby sequentially starts reading the currently
stored voice signal.
[0033]
The memory control circuit 6 corresponds to the control means described in the claims.
Then, opening / closing (shorting / opening) between the control terminals 53 for writing control
of the voice memory 5 by the opening / closing part 61 b of the relay 61 corresponds to the first
control signal described in the claims. Opening / closing (shorting / opening) between the control
terminals 54 for reading control of the voice memory 5 by the opening / closing unit 61 c
corresponds to the second control signal.
[0034]
Next, the operation of the howling preventing apparatus configured as described above will be
described with reference to the timing chart of FIG.
[0035]
That is, when an audio signal is input to any one of the microphones 11, 2, 2,... And the audio
signal is output from the switching circuit 12, the drive circuit 60 outputs the voltage E, thereby
the audio memory The control terminals 53 for write control 5 are short-circuited, and the write
(storage) operation of the voice memory 5 is started.
[0036]
Then, when the input of the voice is completed, that is, when all the microphones 11 and 2, 2.
The voltage E is not output.
As a result, the write operation of the voice memory 5 is completed, and at this time, the control
terminals 54 for reading control of the voice memory 5 are short-circuited, and the voice signal
03-05-2019
12
(data) stored in the voice memory 5 is stored. Is read out.
Then, in response to the read audio signal, the speakers 3, 3,...
[0037]
As described above, according to the present embodiment, the voices input to the microphones
11 and 2, 2,... Are temporarily stored in the voice memory 5, and the microphones 11, 2, 2,. After
the input of the voice to the voice is completed, the voice stored in the voice memory 5 is
amplified from each of the speakers 3, 3,. Therefore, when the microphones 11 and 2, 2,... Are
used, no sound is output from the speakers 3, 3,.
[0038]
Further, since the howling prevention device only includes the memory unit 4 in the base unit 1
with respect to the above-described broadcast equipment shown in FIG. 6, the speakers 3, 3,... As
shown in FIG. In the prior art requiring the attenuators 101, 101,..., Or the switches 102, 102,...
In the speakers 3, 3,. Its construction is very simple compared to the prior art which must be
done. Therefore, even when the present embodiment is applied to the broadcast equipment of
FIG. 6, there is an effect that the remodeling work is simple and the howling preventing device
can be realized at extremely low cost.
[0039]
The sound pressure switch 60a detects whether or not each of the microphones 11 and 2 is in
use, and hence the use state of the microphones 11 and 2. There is no need to bother to provide
means for detecting Therefore, even if the switching circuit 12 described above outputs, for
example, only an audio signal, that is, it does not output ON / OFF information of the hook
switches of the microphones 11 and 2, 2,. The howling prevention device can be realized.
[0040]
03-05-2019
13
Furthermore, in the present embodiment, even if voice is not input to each of the microphones
11 and 2, 2,..., Each of the microphones 11 and 2, 2,. It is recognized that ... is in use. That is, for
example, even if the sound generation of the announcer is interrupted, it is recognized that the
microphones 11 and 2 are in use, and thus the microphones 11 and 2 as described above. The
use state of each of the microphones 11, 2, 2,... Can be reliably detected even though each use
state is detected according to the presence or absence of the audio signal output from the unit.
[0041]
Also, for example, even if the announcer has once again used the microphone and then forgot to
use it again, it is recognized that both of them are simultaneously announced.
[0042]
And, as with the microphones 11 and 2, 2 and so on described in the present embodiment, when
it is a telephone type, when the handset is put on after the voice input is finished, The generated
noise is output as an intermittent speech signal.
Therefore, when the above time t is not provided, the microphones 11 and 2, 2,... Are considered
to be used intermittently, and the input / output of the audio signal to the audio memory 5 is
performed. As a result, the broadcasting equipment itself does not operate properly. On the other
hand, in the present embodiment, since the time t is provided, the influence of the noise can be
prevented.
[0043]
In this embodiment, although the case where this howling prevention device is applied to a
broadcast facility of a supermarket has been described, the present invention is not limited to
this. For example, the present technology can be applied to broadcast equipment and emergency
broadcast equipment used in other places such as hospitals and factories.
[0044]
Furthermore, in the above description, the number of the microphones 11 and 2, 2, ..., and the
03-05-2019
14
speakers 3, 3, ... are plural, but the present invention is also applicable to the case where one or
both of them are one. The technology can be applied. Furthermore, the microphones 11 and 2, 2,
... may be cordless or wireless microphones.
[0045]
And although voice memory 5 which consists of semiconductor memories was used as a storage
means to memorize voice, it does not restrict to this. For example, audio may be stored by other
storage means such as a tape recorder.
[0046]
Further, although the sound pressure switch 60a is used to detect whether each of the
microphones 11 and 2 is in use, the present invention is not limited to this. For example, the use
state of each of the microphones 11 and 2 may be detected by obtaining ON / OFF information
of each hook switch of each of the microphones 11 and 2. A mechanical switch such as this hook
switch may cause chattering when it is turned on / off. In this case, it is necessary to add the
above-mentioned chattering prevention function also to the input side of the memory control
circuit 6 that controls the voice memory 5. In this embodiment, the time t mentioned above has
the effect of preventing this chattering. It will play. This is apparent from FIGS. 3 (b) to 3 (e) and
will not be described here.
[0047]
Further, although the drive circuit 60 is configured as shown in FIG. 3 in order to provide the
time t, the present invention is not limited to this. For example, it may be configured as shown in
FIG. That is, as shown in FIG. 6A, an output of the sound pressure switch 60a (FIG. 6B) and a
signal obtained by delaying the output by the delay circuit 60f by time t (FIG. 6C) are The same
output as in FIG. 3 (e) described above is obtained even if the logical operation is performed by
the logical sum (OR) circuit 60e ((d) in FIG. Is obtained.
[0048]
03-05-2019
15
The circuit configuration of the entire memory control circuit 6 is not limited to the configuration
of FIG. 2 as long as the same operation as described above is realized. Further, the abovedescribed time t and the short circuit time w of the control terminals 54 and 54 are not limited to
the above-described values.
[0049]
As described above, according to the howling preventing apparatus of the present invention, the
voice inputted to the microphone is once stored (recorded) in the storage means, and after the
use of the microphone is finished, The voice recorded above is amplified (reproduced) from the
speaker. Therefore, according to the first aspect of the present invention, when the microphone is
used, since the sound is not amplified from the speaker, the generation of the howling can be
reliably prevented.
[0050]
In addition, it is necessary to provide the loudspeakers with the attenuators 101, 101, ... as in the
prior art shown in FIG. 7 described above, the switches 102, 102, ... as shown in FIG. There is
also an effect that howling can be reliably prevented with a configuration simpler and cheaper
than each of the conventional techniques. And this effect becomes remarkable, when a speaker is
installed in a ceiling or a wall, and the wiring is comprised by a ceiling back and a wall back, or
the installation number of speakers increases.
[0051]
According to the second aspect of the invention, as described above, for example, when the first
control signal is newly input, the storage means is still in the process of reproducing the audio
signal at that time. This is particularly effective in the case where the present invention is
configured to interrupt this, erase all the stored contents stored so far, and re-store the newly
input audio signal. That is, for example, assuming that the announcer temporarily suspends the
use of the microphone and then uses the microphone again, according to the invention of claim
1, even if the interruption time is a momentary time, the control means Since the first control
signal is output after the second control signal is once output, the first control signal is supplied
again to the storage means. Therefore, in this case, when the first control signal is newly supplied
to the storage means, all the contents stored in the storage means are erased, and the contents
03-05-2019
16
are, for example, unreproduced ones. There is a disadvantage that it will not be reproduced
again. On the other hand, according to the second aspect of the present invention, the control
means continuously outputs the first control signal if the interruption is within the
predetermined range, so that the storage operation to the storage means is performed. The
above-mentioned disadvantages do not occur because the operation is continued, ie, the
microphone is considered to be in use.
[0052]
The same applies to the case where the microphone indicates whether or not the microphone
itself is in use by a mechanical switch such as a hook switch. That is, the mechanical switch as
described above may cause chattering during its ON / OFF operation, and the output of the
detection means (detecting signal to detect whether or not the microphone is in use by this
chattering) ) Becomes unstable. Therefore, in this case, according to the invention of claim 1,
when the use of the microphone is finished (for example, when the hook switch is turned off), it
is recognized that the microphone is used again by the chattering. As a result, instead of
reproducing the sound stored in the storage means, the stored contents are immediately erased
before the reproduction is performed, and consequently the sound can not be reproduced. On the
other hand, according to the second aspect of the present invention, even if the detection signal
becomes unstable due to the chattering, the control means passes a predetermined time after the
last detection signal is output. Until then, the microphone is considered as being in use, so it is
not affected by the chattering.
[0053]
According to the howling preventing device of the third aspect of the present invention, whether
or not the microphone is in use is detected based on the presence or absence of the audio signal
output from the microphone. Therefore, there is an effect that it is possible to cope with the case
where the microphone does not particularly have means for transmitting to the control means
side that the microphone itself is in use, as in the above-mentioned hook switch or the like.
[0054]
Brief description of the drawings
[0055]
03-05-2019
17
1 is a schematic configuration view showing an embodiment of the howling prevention device
according to the present invention.
[0056]
2 is a partial detail view of the configuration of FIG.
[0057]
3 is a partial detail view of the configuration of FIG.
[0058]
4 is a time chart of the same embodiment.
[0059]
5 is a diagram showing another example of FIG.
[0060]
6 is a schematic block diagram of the indoor broadcast equipment for supermarkets.
[0061]
7 is a configuration diagram in which a conventional howling prevention device is applied to the
broadcast equipment of FIG.
[0062]
8 is a diagram showing a conventional example different from FIG.
[0063]
Explanation of sign
[0064]
1 master 2 slave microphone 3 speaker 4 memory unit 5 voice memory 6 memory control circuit
11 master microphone
03-05-2019
18
03-05-2019
19
Документ
Категория
Без категории
Просмотров
0
Размер файла
32 Кб
Теги
jph10200986
1/--страниц
Пожаловаться на содержимое документа