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DESCRIPTION JPS596639

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DESCRIPTION JPS596639
[0001]
The present invention relates to an automatic broadcasting apparatus, and more particularly to
an automatic broadcasting apparatus suitable for installation at a place where mixing of electrical
noise is expected. FIG. 1 is a block diagram of a conventional automatic broadcasting apparatus.
In FIG. 1, 1 is an input signal, 2 is an input interface for reading an input signal 1, 3 is a
microcomputer, 4 is a voice synthesis unit for synthesizing aching voice according to a command
from the microcomputer 3, 5 is an amplifier, 6 is an The constant-voltage power supply for
supplying power to each of the above components, 7 is an AC power supply, and 8 is a speaker.
By the way, when the automatic broadcasting apparatus shown in FIG. 1 is installed in a place
where there is much electrical noise, when the electrical noise is mixed in from the input signal
line, the power supply line and the speaker output line, it is broadcast from the speaker 8 In the
non-broadcasting mode, only the noise sound is broadcasted, which causes the problem of
making the person who listens to the broadcast uncomfortable. The present invention has been
made in view of the above, and an object of the present invention is to provide an automatic
broadcasting apparatus capable of preventing only noise noise from being broadcasted when
there is no broadcasting. A feature is that means is provided to automatically zero the broadcast
output when there is no broadcast. The present invention will be described in detail with
reference to the embodiment shown in FIG. 2 and FIG. 4 and FIG. FIG. 2 is a block diagram
showing an embodiment of the automatic broadcasting apparatus according to the present
invention. The same parts as in FIG. 1 are indicated by the same reference numerals and the
explanation thereof is omitted here. In FIG. 2, the device of FIG. 1 is provided with a relay 9
which is turned on and off in response to a command from the microcomputer 3. The normally
open contact 9a of the relay 9 is connected between the input end of the amplifier 5 and the
ground. When an on command is issued to microcomputer 3 and relay 9 at the time of
broadcasting and relay 9 is turned on, contact 9a is closed, and the input terminals of amplifier 5
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are short-circuited, and even if electrical noise is mixed, it is This is to prevent amplification and
broadcasting from the speaker 8. When broadcasting, an off command is issued to the
microcomputer 3 3 9 relay 9 prior to broadcasting, the relay 9 is turned off, the contact 9 a is
opened, and then the voice synthesis unit 4 is input signal 1. Since a corresponding synthesis
command is issued, the synthesized sound synthesized by the speech synthesis unit 4 is
amplified by the amplifier 5 and broadcasted from the speaker 8. Then, during broadcasting, the
microcomputer 3 monitors all the states of the voice synthesis unit 4 and, when the expected
broadcasting is completed, issues an ON command to the relay 9 again to make the input of the
amplifier 5 zero. 3 is a time chart of the presence or absence of the input signal 1 of FIG. 2, the
on / off of the relay 9, and the presence or absence of the broadcast sound, where (a) is the input
signal, middle) is the relay, (C) is the broadcast Show a sound.
According to the embodiment of the present invention described above, when there is no
broadcast, the input terminals of the amplifier 5 are short-circuited so that the input becomes
apparently zero, and even if electrical noise is mixed, it is amplified and broadcasted I have not.
Therefore, even if the automatic broadcast apparatus is installed in a place where there is a large
amount of electrical noise, it is possible to prevent the people who listen to the broadcast from
feeling uncomfortable. FIG. 4 shows another embodiment of the present invention, where (a)
corresponds to FIG. 2, and 10 shows the input interface 2, microcomputer 3, sound synthesis
unit 4, amplifier 5 of FIG. The part which consists of a constant voltage power supply 6 is shown,
others are the same as that of FIG. In FIG. 4 (a), the relay 8 is connected to the input side of the
speaker 8 with a relay normally closed contact 11b which shorts the input terminals when there
is no broadcast. FIG. 4 (b) is a circuit diagram of the relay 11 for controlling the relay contact
11a of FIG. 4 (a), and all the input signal contacts A ', B',. When this is the case, the relay 11 is
turned off, and the contact point 11b thereof shown in the fourth ff1 (a) is closed so that the
input terminals of the speaker 8 are shorted. Even when configured as shown in FIG. 4, the effect
is the same as in the case of FIG. As described above, according to the present invention, even if
electrical noise is mixed in non-broadcasting, it is not amplified and broadcasted, so that it is
possible to prevent the person who listens to the broadcast from feeling uncomfortable. There is.
[0002]
Brief description of the drawings
[0003]
1 is a block diagram of a conventional automatic broadcasting apparatus, FIG. 2 is a block
diagram showing an embodiment of the automatic broadcasting apparatus of the present
invention, and FIG. 3 is the presence or absence of an input signal in FIG. FIG. 4 is a diagram
showing another embodiment of the present invention.
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