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DESCRIPTION JPS5468102

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DESCRIPTION JPS5468102
Description 1, title of the invention
Loudspeaker system
6. Detailed description of the invention The present invention detects the approach of the
microphone to the speaker and shuts down the output of the speaker or lowers the level, .... On
the stem. As is well known, when a plurality of speakers are connected to an amplifier and a
microphone is used to give a lecture or a speech, etc., if at least one of the microphones is
brought close to the D speaker, the Kono loud-speaking 7 The stem system's lag gain is
abnormally increased, howling occurs, and the loudspeaker including the other loudspeakers can
not be used. That is, in such a stem system, the movable node rotation of the microphone is
limited. On the other hand, in such a loudspeaker system, the gain of the amplifier may be
lowered as much as possible in order to prevent the generation of the above-mentioned
“urifog” or to suppress the generation of the urling. C (It is not preferable because the ability
of all one of the loudspeaker systems to reduce the loudspeaker ability is reduced and the
purpose of the loudspeaker is reduced. However, when the microphone or a certain speaker is
approached, the gain of the transmission characteristic between the speaker and the microphone
becomes much more dog-like than that of the other speakers and the above-mentioned 71
crophone. According to the constant output amount reduction of the speaker only, the abovementioned] · Uring EndPage: 1 can be effectively prevented without lowering the loud-sounding
ability of the whole reproduction system. From the point of view of the present invention, when
the microphone approaches a certain speaker, the operation of discriminating the speaker k and
performing the level reduction of the speaker only & without manual operation is performed
automatically. Proposed new technologies. Hereinafter, the seventh embodiment of the present
invention will be specifically described with reference to the drawings. Fig. 1 (a block diagram of
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a loudspeaker system according to the present invention, which is a microphone capable of
moving 1il- freely, and the output 11llj of this microphone 1 is on the input side of an amplifier 2
for amplifying its audio output signal Further, three speakers 6.7.8 are connected to the output
side of the amplifier 2 through the cane control circuits 3, 4. On the other hand, in the vicinity of
the above-mentioned speaker 6.7.8, the 1st generator (or modulator) 9,10.11 of a specific
frequency such as infrared rays, ultrasonic waves or radio waves is installed and connected to
this And a specific frequency control signal transmitter 12, 13.14 is disposed close to the front
center of the speaker.
Reference numerals 15.16 and 17 denote signal comparison circuits which receive control
signals from the control and word generators 9 and 10.11 at one input terminal. Further, a
control signal receiver 18 for receiving information from the control signal transmitters 12,
13.14 is integrally attached to the microphone 1, and the output side thereof is the signal
comparison circuit. 15, 16 + 17 are connected to the other input terminal. The output sides of
these signal comparison circuits 15 and 16.17 are respectively connected to the control signal
input terminals of the gain control circuit 3.4.5. The signal frequencies of the control signal
generators 9 and 10.11 should be largely different so that their discrimination is easy. Next, the
operation of the loudspeaker system having such a configuration will be described. First, power
is supplied to all of the above-mentioned main systems. Therefore, when the distance between
the microphone 1 and each speaker 6.7 ° 8 is separated, the state of the signal of the specific
frequency from each of the control signal transmitters 12 and 13.14 is changed to the state of
the microphone 1 Control [Go to No. 18 receiving container! Therefore, no key / control signal is
supplied from the output 11 + 11 of the signal ratio 1 × 15,16.17, so that all speakers 6.7.8
have an audio signal with an equal sound pressure level. The noise is supplied from the amplifier
2 and emitted. If one of the M, -1-comed microphones is one of Sv-Bev 6 ° 7.8 (“: J close to the
J-speaker 6, the above-mentioned control signal caustic and cabinet 1sjriI: g3 Within a range
covered by the control 1 of the specific frequency emitted from the control (layer) transmitter
12, the control 2 receives the control fill 2. At this time, depending on the degree of proximity
between the microphone 1 and the speaker 6, the above-mentioned 'control! The signal level
obtained by the f @ l signal receiver 18 is different, and that the signal level reaches Z = J to the
output signal level from the control signal generator and reaches a predetermined value When it
is detected, whether or not the signal obtained by the control signal receiver 18 is from the
control signal generator 9 is detected in the comparison (b) and the detected level In accordance
with the above, the cane control circuit is controlled to reduce the supply of the audio signal
current to the speaker 6 completely. Therefore, the occurrence of urling between the microphone
1 and the speaker 6 is prevented. The microphone 1 is close to the other speakers 7 or 8 (in one
case, the output A adjustment of each speaker is also performed dynamically, and howling occurs
without reducing the overall gain of the reproduction system). It can be prevented.
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In the above description, although the control signal for specifying each of the speakers 6.7 and
8 has a different frequency or a different signal, it is possible to use a digitally coated signal
formed to specify each of the speakers 6.7.8. Or time division name can be used arbitrarily. Next,
FIG. 2 is a block circuit diagram showing another embodiment of the loudspeaker system
according to the present invention. This EndPage: 2 is different from that shown in FIG. 1, and
the audio signal line and the control signal line are used in common. Here, 19 is a microphone,
and 2o is a control signal receiver attached to the microphone 19. These plane output signals are
mixed in the mixer M and supplied to the amplifier 21 through a common signal line. The output
of the amplifier 21 is supplied to the speakers 24 and 25 through the resistor 22. 23 i through
the same common D line. The control signal generator 28.29 connected to the control signal
generator 26.27, which is connected to the control signal generator 26.27, is arranged to face
the front center of the speaker 24.25. A reference numeral 30 ", 31 is a pass / pass filter
connected to the output line of the amplifier 21 and has different band-pass filter characteristics,
and separates and takes out only the control signal, and outputs the above control signal and the
above-mentioned control signal The output signal of the comparator 26.27 is supplied to the
signal comparison circuit 32.33. In this signal comparison (b), it is discriminated whether the
control signal frequency for specifying each of the speakers 24.25 has been input to the
microphone 19 or not. Depending on the discrimination operation, either of the speakers 24 or
25 can be used. When the relationship between the heel and the microphone 19 is matched, the
output of the signal comparison circuit 32 is connected to the output elevation j of the relay
solenoid 36 via one of the driver circuits 34 and 35 connected in a rule. It is configured to
energize any one of 37, open its switch 384 or 39, and provide an audio signal whose level is
reduced by the 22 ° resistance to the speaker 24 or 25 of the FIT constant. . Next, the operation
of such a configuration will be described. First, when the microphone 19 does not approach any
of the speakers 24 ° 25 and the microphone 19 does not exist within the range of infrared light,
ultrasonic waves or radio waves from the control signal transmitters 28.29. Since the control
signal such as infrared light does not reach the control signal receiver 2o or is extremely weak at
all, only the audio signal input from the microphone 19 is amplified by the amplifier 21 and
hence No output signal is fed from the signal comparison circuit 32.33, and the triver circuit
34.degree. 35 is not driven.
For this reason, the switch 38. 39 is not opened, and the sound from the microphone 19 is
expanded and emitted from all the speakers 24 ° 25 (with an equal predetermined level.
However, either 1-g self-microphone 19 or 1-kawaki 24.25, or any other example, (the speaker
24 is close to 2, the above control 1 signal transmitter 28 from Lri when it reaches the control
signal receiver 1 dial 20, its control (1.1): common line with the audio signal from the
microphone 19 Both pass through and are amplified by the amplifier 21. Then, among the fch
and both i codes, the L high frequency master signal of the high frequency band is filtered by the
low pass filter 3Q, and is supplied to one input terminal of the above-mentioned frequency
comparison circuit 32. On the other hand, the other input terminal of the signal comparison
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circuit 32 is supplied with a signal from a control signal transmitter having substantially the
same frequency as that of the control signal supplied to one of the human power and control
terminals. An output signal is output from the comparison circuit 32 and supplied to the triver
circuit 34, and the driver signal causes the relay solenoid 36 to be used. Thus, the switch 38 is
opened, and the audio signal is level-reduced by the resistor 22 and supplied to the speaker 24,
and a low-level audio signal is emitted from the speaker 24. Then, it is controlled so as not to
reach the microphone 19. The same applies to the case where the microphone 19 is in proximity
to another speaker 25. The control signal frequency includes the audio reproduction signal. It is
advantageous to prevent interference from external signal or external noise by selecting a
suitable frequency of not 20 KI (Z to 1 oo KHz). The control signal receiver 20 may be integrated
with the microphone 19. Furthermore, it is also conceivable to supply the control signal from the
control signal generator 26 ° 27 directly to the speaker, but in this case there is an advantage
that the control signal receiver 28. 29 can be omitted. These problems are solved because
problems occur due to heating or disconnection of the speaker's coil, interference of the
vibration wave to light on the audio signal, etc. If it is carried out on id, it will be useful. As
described above in detail, according to the present invention r4, the microphone connected to the
amplifier is provided with transmitting means and receiving means for detecting that the speaker
approaching to the amplifier is also approached t, respectively The means is disposed in the
vicinity of the speaker, and the receiving means is associated with the microphone, and when
approaching, the control 1 from the transmitting means is received by the receiving means and
the received control signal causes the reception of the control signal. Due to the reduction of the
output level, when the microphone approaches a specific one of a plurality of juxtaposed
speakers, the output level of only that speaker is lowered by a fixed amount, and Howling can be
effectively prevented without reducing the ability to spread.
In addition, the configuration provided for this purpose has various effects such as being
extremely simple, inexpensive and beneficial.
4. Brief description of the drawings shows an embodiment of the present invention, FIG. 1 is a
block circuit diagram of a loudspeaker system according to the present invention, FIG. 2 is a
block circuit showing another embodiment of the loudspeaker system. It is a varnish. 1.19 ... 7 .....
microphone 2.21 ......... amplifier 6.24 ........, speaker 12.28 ...... transmission means 18.20 ......
receiving means patent applicant Noni Co., Ltd. representative patent attorney Koike Akiradai 1m
procedure amendment (spontaneous) 1978 November 17n Commissioner of the Patent Office
Zenji Kumagai hall 1, display Showa incidents Patent application No. 135331 2; title 2 of the
invention 2, title of the invention / stem of the invention 3, the person who makes correction ·
relationship with lGf't r “Applicant n: PR Tokyo parts for district north goods 6-chome The
seventh 35 fourth, the agent 〒 105 address Toranomon 2-chome, Minato-ku, Tokyo 2nd 6th 4th
11th Mori Building 11th Floor (50B) 8266 ((Represented) Name (6773) Patent Attorney Small
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Bubbles. 56 correction instruction date spontaneous 6, object of correction 7, content of
correction 2 E-EndPage: 4 (]) specification page 10 line 17 to page 11 line 5 ... beneficial. The
following statement is corrected as follows. Next, FIG. 3 shows a microphone as a control signal
receiver and a speaker as a control signal transmitter, and an amplifier 41 is connected to the
microphone 40, and a common signal line of the output thereof is used to produce an audio
signal. A band pass filter 42.43 is connected to separate the signals. A resistor 44.45 for
decreasing the output level is connected to the low pass filter 42.43, and a speaker 48.49, which
also serves as a transmitter of the control signal, is connected via the mixer 46.47. . The mixers
46 and 47 described above are for supplying control signals to the speakers 48 and 49 together
with audio signals. On the other hand, 60.51 is a band pass filter which separates and takes out
only the control signal among the audio signal and the control signal inputted to the microphone
40, which are connected to the above common signal line and have different filter band
characteristics respectively With 52.53 is a comparator, which is connected to a band pass filter
50.51 and an oscillator 54.55 having band characteristics different from one another, and
supplied from the band pass filter 50.51 to the comparator 52.53. Of the relay driver circuit
56.57 selectively connected to the output side of the comparator 52.53 when the predetermined
frequency signal of It has become.
A 68.59 lane renoid is connected in parallel to the resistor 44.45 with a switch 60.61 controlled
to be opened or closed by activation thereof. According to the loudspeaker system having such a
configuration, if the microphone 40 is not close to any of the loudspeakers 48.49, a high
frequency band output from the oscillator 54.55 through the loudspeakers 48.49 As the
bandwidth is sufficient to reach 1.of G (about z, the radio wave of more than, for example, about
18 歇 may not be reached by the microphone 40 [the each lane 52.53 of the lane laneid With no
drive current available, switch 60.61 remains closed. Therefore, the sound input to the
microphone 40 is the amplifier 41. After passing through the band pass filter 42.43, the sound is
emitted from the speakers 48.49 at the same sound pressure level without passing through the
resistor 44.45. However, the microphone 4o approaches, for example, the speaker 49, and the
control signal of a specific frequency supplied from the oscillator 55 to the speaker 49 via the
mixer 47 reaches the microphone 40 via air, and the amplifier 41 Vrc The amplified signal is
filtered by the band pass filter 51 and only the control signal is supplied to the comparator 53.
Then, whether or not this control signal is from the oscillator 55 is compared and detected, and if
the same, the comparator 53 supplies a drive signal to the tribber circuit 67 to energize the rerail
signal 59 and switch Make 61 open. Thus, the audio signal from the microphone 40 is applied to
the resistor 46 through the band pass filter 43 where the signal is attenuated and the
downconverted audio signal is input to the speaker 49. Therefore, the sound pressure level
emitted from the speaker 49 is small. In this case, the sound pressure levels of the ten speakers
can be controlled by selecting a control signal at a band t 100 Hz interval between 19 Kfl (z to 20
KH 2) and assigning it to the control oscillator 54. (2nd page, line 12, line 6 to line 12, line 12),
corrects "Figure 2 is ... reception means" as follows. [FIG. 2 is a block circuit diagram showing
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another embodiment of the loudspeaker system] FIG. 3 is a block circuit diagram showing still
another embodiment. 1.1-9.40 ... microphone, 2, 21 ° 41 ... amplifier, 6, 7, 8, 24, 25, 25, 48 °
49 ... speaker, 12.28 ... transmission means, 18 EndPage:
5
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