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JPH06350544

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DESCRIPTION JPH06350544
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
broadcasting apparatus used in schools, housing complexes, company premises and the like.
[0002]
2. Description of the Related Art FIG. 4 shows a conventional configuration of a broadcasting
system of a system in which a plurality of speakers are driven by one amplifier. Reference
numeral 1 is a microphone for inputting a broadcast sound. An amplifier 2 amplifies a minute
audio signal, and an amplifier unit 5 including an amplifier has an output impedance of 1 kΩ. An
impedance converter 8 can be set to two types of 10 kΩ and 3.3 kΩ. 7 is 10 kΩ when it is set to
A by the impedance switching unit that switches the impedance of 8 and it is 3.3 kΩ when it is
set to B. 9 is a speaker, 11 is a speaker unit including 7-8 and 9 is a pair cable of transmission
paths.
[0003]
Loudspeakers usually have an input impedance of 8 Ω, but if they are connected to an amplifier
as they are, they are susceptible to line resistance and can not be used in a broadcast apparatus
having a line length of several hundred meters to several kilometers. For this reason,
conventionally, it has been common practice to place an impedance converter 8 of 3.3 kΩ: 8 Ω
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or 10 kΩ: 8 Ω at the front stage of the speaker and perform impedance matching with the
output impedance of the amplifier as 1 kΩ. Here, in the case of 3.3 kΩ, three speakers can be
connected in parallel to obtain matching. In the case of 10 kΩ, 10 speakers can be connected for
matching. When the number of loudspeakers that are not matched is connected, there is a
problem that in the extreme case, the sound is distorted or the volume increases or decreases.
[0004]
For this reason, in the case of a conventional simultaneous broadcast speaker, two types of
impedances of 3.3 kΩ: 8 Ω and 10 kΩ: 8 Ω are connected according to the number of
connected speakers, as shown in FIG. It was supposed to be selected by. According to the above
configuration, a voice is input from the microphone 1, a minute voice signal is amplified by the
amplifier 2, matching is performed by the impedance converter 8, and simultaneous
broadcasting is performed by performing output from the speaker 9.
[0005]
However, in the conventional broadcasting apparatus as described above, the switching of the
impedance must be performed by the contractor for each speaker. In addition, since the speaker
is usually installed on the ceiling, the construction efficiency is poor, and there has been a
drawback that system changes such as expansion can not be easily performed.
[0006]
SUMMARY OF THE INVENTION In the simultaneous broadcasting apparatus of the present
invention, switching of the impedance on the speaker unit side can be remotely controlled from
the amplification unit side.
[0007]
According to the present invention, it is possible to switch the impedance on the speaker side by
a simple operation on the amplification unit side without performing special construction for the
existing speaker when adding the speaker.
[0008]
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2
The invention will now be described in detail with reference to the drawings showing an
embodiment thereof.
FIG. 1 shows an entire configuration of a broadcast apparatus according to the present invention,
which is an example of performing impedance switching on the speaker unit side by setting of
the impedance setting unit 3 on the amplification unit 5 side.
[0009]
1 is a microphone for inputting simultaneous broadcast audio, 2 is an amplifier for amplifying a
minute audio signal from the microphone 1, 4 is a capacitor for cutting a DC voltage, 3 is an
impedance setting unit for setting an impedance, 5 is an amplification unit including 2.3.4.
Reference numeral 12 is a paired cable for transmitting an audio signal as well as a remote
control signal. 10 is a capacitor for DC voltage cut, 6 is a control unit for controlling 7, and 7 is a
switch for switching impedance, and switches A (10 kΩ) B (3.3 kΩ) by 13 control signals. An
impedance converter 8 can be set to two types of 10 kΩ: 8 Ω and 3.3 kΩ: 8 Ω. 9 is a speaker
with an input impedance of 8 Ω. 11 is a speaker unit including 6.7.8.9.10. In this configuration,
the state set by the impedance setting switch 3 is transmitted to the control unit 6 by some
method, the control unit determines the state of 3 and controls the switch 7 and reflects the state
of the impedance setting unit on the switch 7 . This operation is performed simultaneously or
sequentially with a plurality of speaker units connected in parallel.
[0010]
The present invention will now be described by way of specific examples. 2 and 3 each show an
embodiment of the present invention. The embodiment of FIG. 2 will be described first. Reference
numeral 1 denotes a microphone for inputting broadcast audio, and 2 denotes an amplifier for
amplifying a minute audio signal from the microphone 1. 4 is a capacitor for cutting a DC
voltage. Reference numeral 201 denotes a DC power supply, which can output positive and
negative voltages. Reference numeral 3 denotes a switch as an impedance setting unit for setting
the impedance. Reference numeral 202 denotes a choke coil for separating an audio signal and a
DC voltage, and has a sufficiently large impedance to the audio frequency. An amplification unit
5 includes 2.3.4.201.202 and has an output impedance of 1 kΩ. 12 is a pair cable for
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transmitting an audio signal and a DC voltage. 10 is a capacitor for DC voltage cut, 7A is a relay
switch for switching the impedance, and is switched to the A side or B side when a DC current
flows in the coil of 6A. A side is 10 kΩ, B The side corresponds to 3.3kΩ. This relay is also
bipolar and latching type. That is, when a positive voltage is applied to the coil 6A for several
seconds, it is held at the A side, and when a negative voltage is applied for several seconds, it is
held at the B side. Reference numeral 8 denotes an impedance converter which can be set to two
types of 10 kΩ: 8 Ω and 3.3 kΩ: 8 Ω. 9 is a speaker with an input impedance of 8 Ω. B is a
control signal for controlling the relay switch 7A. Reference numeral 203 denotes a choke coil
for separating a DC voltage and an audio signal, which has an impedance sufficiently large for
the audio frequency. Reference numeral 6A denotes a drive coil as a control unit of the relay
switch 7A, and 6A and 7A constitute one relay. 11 is 6A. 7A. A speaker unit including 8.9.10, and
a plurality of speaker units 11 are connected in parallel to one amplification unit 5.
[0011]
A setting procedure in the case where three speaker units 11 are connected in parallel in the
above configuration will be described. Here, it is necessary to set the relay switch 7A to the B
side to be 3.3 kΩ. First, the switch 3 is inclined to the B side for a few seconds. This switch is not
normally in contact with either A or B. As a result, a negative voltage is applied to the coil 6A. As
a result, the relay switch 7A is set to 3.3 kΩ on the B side. This operation is simultaneously
performed by the three speaker units 11. After a few seconds, the switch 3 is not in contact with
the original A or B either. At this time, since 7A is a latching type relay, even if the negative
voltage of the coil 6A is lost, the state set to the B side is maintained.
[0012]
Next, when the speaker unit 11 is added and expanded to 10 units, it is necessary to set the relay
switch 7A to the A side to be 10 kΩ. At this time, the switch 3 is tilted to the A side for several
seconds. As a result, a positive voltage is applied to the coil 6A, whereby the relay switch 7A is
set to 10 k.OMEGA. On the A side. In addition, even if the positive voltage is lost from the coil 6A,
it is held in the A side as in the case of B.
[0013]
As described above, the impedance switching can be appropriately performed when the number
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of speaker units is changed, by the simple operation of the amplification unit. Although the
power supply 201 of positive / negative polarity is shown in this embodiment, the common
amplifier 2 often requires a bipolar power supply. In this case, the power supply 201 does not
need to be specially prepared. Next, FIG. 3 which is a second embodiment will be described.
[0014]
Reference numeral 1 denotes a microphone for inputting simultaneous broadcast sound, and
reference numeral 2 denotes an amplifier for amplifying a minute audio signal from the
microphone 1, which is turned on / off by a control signal 309. 4 is a capacitor for cutting a DC
voltage, 301 is a DC power supply, 302 is a choke coil for separating a DC voltage and a remote
control signal, and 303 is a relay switch to be turned on / off by a control signal 308. A
microcomputer 304 controls the relay and amplifier, controls the power supply of the transceiver
305, and generates and decodes the remote control signal. A transceiver unit 305 transmits and
receives a remote control signal from the control unit 304. The transceiver unit 305 has a
sufficiently large impedance when no power is supplied. Reference numeral 3 denotes a switch
as an impedance setting unit for setting the impedance. An amplifier 5 has an output impedance
of 1 kΩ as in FIG. Reference numeral 311 denotes a variable resistance for volume adjustment,
which is controlled by the control signal 310.
[0015]
11はスピーカユニットである。 Reference numeral 12 is a paired cable for transmitting an
audio signal as well as a remote control signal. 10 is a capacitor for DC voltage cut, 7B is a relay
switch for switching the impedance, and switches A (10 k.OMEGA.) B (3.3 k.OMEGA.) According
to the control signal 13. FIG. An impedance converter 8 can be set to two types of 10 kΩ: 8 Ω
and 3.3 kΩ: 8 Ω. 9 is a speaker with an input impedance of 8 Ω. 312 is a choke coil for
separating a DC voltage and a remote control signal; 314 is a DC / DC for receiving a DC voltage
from a DC power supply 301 and supplying current to the control unit 6B, the transceiver 313,
etc. A converter 6B is a microcomputer as a control unit which controls the relay switch 7B and
decodes reception of the remote control signal. Like the transceiver unit 305, 313 is a
transceiver unit for remote control signals, and has a sufficiently large impedance at the time of
no power feeding.
[0016]
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First, the setting procedure when three speaker units 11 are connected in parallel will be
described. Here, it is necessary to set the relay switch 7B to the B side to be 3.3 kΩ. First, the
switch 3 is inclined to the B side for a few seconds. The microcomputer 304 detects that the
switch 3 has become B at this time. Here, control is performed through control lines 307, 308,
and 309 so that the amplifier 2 is turned off, the relay 303 is turned on, and the transceiver 305
is turned on. At this time, a DC voltage is applied to the DC / DC converter 314 to turn on the
microcomputer 6B and the transceiver 313. This enables transmission and reception of the
remote control signal. In this state, the microcomputer 304 transmits a command "B set" to all
three microcomputers 6B by simultaneous broadcast. The microcomputer 6B having received
this command sets the relay 7B to B through the control line 13. Further, the microcomputer 6 B
transmits a command of “B set complete” to the microcomputer 304. The microcomputer 304
receives this command. When this command is received from all the three microcomputers, or
after a predetermined time has elapsed, the microcomputer 304 turns off the relay 303, turns on
the amplifier 2 and turns off the transceiver 305. At this time, the DC / DC converter 314 and the
microcomputer 6B are also turned off. Thus, the impedance setting of the three speaker units 11
can be set to 3.3 kΩ. Furthermore, when the speaker unit 11 is added to 10 units, it is necessary
to set the relay switch on the A side to 10 kΩ. Also at this time, it can be easily analogized that
the operation can be automatically performed by tilting the switch 3 to the A side for a few
seconds in the same procedure as in the case of the B.
[0017]
Further, in the present embodiment, a volume 311 is provided for volume control. When three
units and ten units are installed, matching is achieved, and the combined impedance by the
speaker unit is approximately 1 kΩ. However, in the case of the number other than this, even if it
sets relay 7B to either A or B, it can not be aligned. In this case, the sound may be distorted or the
volume may be large or small. In order to suppress this volume change, the number of connected
speaker units is automatically detected, the volume 311 is controlled by the control line 310, and
the resistance value is adjusted according to the connected number to adjust the volume. It is
something to do.
[0018]
The case where five speaker units 11 are connected in parallel will be described as an example.
はじめにスイッチ3をAにセットする。 Next, in accordance with the above-mentioned
procedure, the microcomputer 6B sets the relay 7B to A and transmits a command of "A set
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completed" to the amplification unit 5. The amplification unit 5 receives the “A set complete”
command from the five speaker units 11. At this time, it can be seen that there are five speaker
units 11 actually connected. At this time, the volume 311 is controlled to a predetermined
resistance value. As described above, it is possible to always broadcast at a constant volume level.
[0019]
As described above, in the simultaneous broadcasting apparatus of the present invention,
impedance switching on the speaker unit side can be remotely controlled by simple switch
operation on the amplification unit side. According to the present invention, at the time of the
work of changing the number of speaker units, the setting operation can be performed without
touching the speaker units originally installed. Further, according to the present invention, the
volume level on the speaker side can be kept constant.
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