JPH05153015A - Wireless loud speaking/repeating equipment - Google Patents

Abstract

PURPOSE:To provide a wireless loud speaking/repeating equipment which can effectively reduce the generation of a noise pollution owing to voice. CONSTITUTION:The equipment is provided with a demodulating circuit 2 demodulating a received radio wave with one cycle within an optional demodulation wave which is previously specified, a modulating circuit 5 modulating the signal of a voice band outputted from the demodulating circuit with one of an optional modulation wave which is previously specified, a transmission amplifying circuit 7 for transmitting an output from the modulating circuit 5 with prescribed power, a voice amplifying circuit 9 for amplifying the signal of the voice band outputted from the demodulating circuit 2 and a loud speaking equipment (speaker) 10 for converting the output of the voice amplifying circuit 9 into voice.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless loudspeaker repeater, and more particularly to a wireless loudspeaker repeater for performing a multi-stage wireless relay of a voice signal and performing a loud sound in each relay section.

[0002]

2. Description of the Related Art A conventional wireless loudspeaker receives a predetermined radio wave such as a weak radio wave or a low power radio and demodulates it with a predetermined one frequency, and an audio signal from the demodulation circuit. It is composed of a voice amplifier circuit and a loudspeaker (speaker) for converting the amplified voice signal into voice.

[0003]

This conventional wireless voice relay device does not have a relay function of demodulating a received radio wave, outputting it as a voice, and re-transmitting it.
In order to expand the voice over a wide range, it is necessary to make the amplifier circuit and the loudspeaker (loudspeaker) strong in order to increase the power for transmitting the voice. For this reason, miniaturization is not easy, and the output of the other loudspeaker, which is not portable, is large.Therefore, the volume difference is too large near and far from the loudspeaker. There was a problem such as causing. or,
Further, when a loud sound is required over a wide range, a large-scale mechanism is required, and it is very difficult to perform the sound over a wide range with an appropriate volume according to the terrain and place.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wireless loudspeaker repeater capable of improving the disadvantages of the conventional example and, in particular, effectively reducing the noise pollution of voice.

[0005]

In the present invention, a weak radio wave,
A demodulation circuit for receiving a predetermined radio wave from a low-power radio or the like and demodulating the demodulated wave at one frequency out of a predetermined arbitrary demodulation wave;
Switching to select and output the external audio input terminal that takes in the audio band signal from an external device such as a microphone and the audio band signal output from the demodulation circuit and the audio band signal that is input through the external audio input terminal A switch, a modification circuit that modulates a signal in the voice band of the output of the changeover switch with one frequency of a predetermined arbitrary modulation wave, and a transmission for transmitting the output from the modulation circuit with a predetermined power. A configuration including an amplifier circuit, a voice band amplifier circuit for amplifying a voice band signal output from the changeover switch, and a loudspeaker (speaker) for converting the output of the voice band amplifier circuit into voice Is taking. This aims to achieve the above-mentioned object.

[0006]

The present invention will be described below with reference to the drawings.

First, FIG. 3 shows an embodiment of a loudspeaking method in which a plurality of wireless loudspeaker repeaters 1 of the present invention are used to perform a multi-stage relay and to simultaneously perform loudspeaking. As shown in the figure, a voice is input from an arbitrary wireless voice relay device 1, that is, a microphone 22 of the # 1 wireless voice relay device 1 in this embodiment, and the voice is modulated by a weak radio wave f ₁ to the # 2 wireless voice relay device. Along with transmitting to the device 1, the loudspeaker of the # 1 wireless loudspeaker relay device 1 is used. Similarly, the # 2 wireless loudspeaker repeater 1 demodulates the received weak radio wave f ₁ and converts it into the original voice signal, then modulates it again and transmits it to the next stage # 3 wireless loudspeaker repeater 1 as the weak radio wave f _2. At the same time, the # 2 wireless loudspeaker repeater 1 makes a loud voice.
In this way, the voice input by the microphone 22 is placed on the weak radio wave by each of the wireless loudspeaker repeaters 1 and multistage wirelessly relayed, and the respective wireless loudspeaker repeaters 1 simultaneously raise the voice.

In this way, a plurality of wireless loudspeaker repeaters 1 are arranged at appropriate distances and directions to perform multistage wireless relay, and if the voices are simultaneously boosted, the volume of the loudspeaker is appropriately increased, and the wireless loudspeaker repeaters at each stage. 1 can be expanded within the audio audible range 31, and by appropriately arranging the wireless expansion relay device 1 without causing noise pollution, it is possible to expand over a wide area suitable for the terrain and place. Also, when using a loud speaker with a large volume, there is a significant difference in volume near and far from the loud speaker, and the sound is too loud and uncomfortable near the loudspeaker. However, there were some drawbacks, such as the effect of echo on the topography and the valleys of buildings. However, if the loudspeaking method of FIG. 3 according to the present invention is adopted, a plurality of wireless loudspeaker repeaters 1
From the loudspeaker, it is possible to simultaneously and simultaneously increase the volume of sound within a required range with an appropriate volume.

Further, the relay radio wave has an advantage that it can be freely used as long as it is a weak radio wave, but by using a radio wave of higher output such as a low power radio according to the purpose, a device can be arranged at a longer interval. A wide range of voices can be produced.

An embodiment of the wireless voice relay apparatus 1 used in the above-described voice amplification method will be described with reference to the block diagram of FIG. When the wireless loudspeaker repeater 1 is used for the relay and loudspeaker functions, a low-power radio wave in which voice is modulated is received by the receiving antenna 4, and the demodulation circuit 2
The demodulated wave oscillation selection circuit 3 demodulates a preset demodulated wave to output an audio signal. This audio signal is input to the modulation circuit 5 and the audio amplification circuit 9 via the changeover switch 21. The audio signal input to the modulation circuit 5 is
In synchronization with the determination of the demodulation wave in the demodulation wave oscillation selection circuit 3, the modulation circuit 5 modulates the modulation wave set and adjusted in the modulation wave oscillation selection circuit 6, and the transmission amplification circuit 7
The signal is amplified to a predetermined electric power in 1 and then transmitted from the transmitting antenna 8.

Here, the modulated wave is set at a frequency different from the frequency band of the demodulated wave. Then, the low-power radio wave transmitted from the transmitting antenna 8 is received by the next-stage wireless voice relay device 1 and further relayed to the next-stage wireless voice relay device. The other voice signal that has passed through the changeover switch 21 is amplified by the voice amplifier circuit 9, and then the loudspeaker (speaker) 10 is driven to amplify the voice.

When the wireless loudspeaker repeater 1 is used for voice input and voice transmission function, the switch of the changeover switch 21 is changed from the demodulation circuit 2 side to the external voice input terminal 11 side, and the output of the changeover switch 21. From, a voice signal input to the external voice input terminal 11 is output from a microphone or the like provided outside the device. In this way, the wireless loudspeaker repeater 1 is used for voice input and loudspeaker by connection with a microphone or the like depending on the switching state of the changeover switch 21, or for wireless relaying and loudspeaking of voice signals.

In FIG. 2, a radio wave in which a voice signal is modulated is received by a receiving antenna 4, demodulated by a demodulation wave from a demodulation wave oscillation selection circuit 3, demodulated in a demodulation circuit 2, converted into a voice signal, and output. One of the audio signals has a modulated wave different from the frequency of the demodulated wave input from the modulation / oscillation selection circuit 6 to the modulated wave circuit 5, and after being modulated, is amplified to a predetermined power by the transmission amplification circuit, and the transmission antenna 8 Sent from. or,
The other audio signal from the demodulation circuit 2 is the audio output terminal 1
2 is output to the outside of the device, and the sound is loudened via an external loudspeaker or the like. As described above, by using the external loudspeaker, the wireless loudspeaker repeater 1 can be downsized and the power consumption can be reduced, and the portable device can be provided.

Further, as shown in FIG. 4, when mounted on a moving body such as an automobile, it is possible to provide an extremely wide range loudspeaking system having mobility.

[0015]

As described above, according to the present invention, since it has a relay function for retransmitting by using weak radio waves, low power radio, etc., a plurality of wireless loudspeaker repeaters of the present invention can be adapted to the terrain or place. By appropriately installing the voice signal, it is possible to increase the volume of the voice signal to a place where these wireless loudspeaker repeaters are required in a multi-stage wireless relay and a proper volume over a wide range, and it is also possible to prevent noise pollution. Furthermore, since the loud power can be kept small,
Since the wireless loudspeaker repeater can be miniaturized and therefore has good portability, it is possible to connect an existing loudspeaker to the outside of the wireless loudspeaker repeater.
It is possible to provide a more compact and inexpensive wireless voice relay device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an embodiment of a method of multistage wirelessly relaying and amplifying a wireless loudspeaker repeater of the present invention.

FIG. 4 is an explanatory diagram showing an example of a loudspeaking method when the wireless loudspeaker repeater of the present invention is mounted in an automobile and used.

[Explanation of symbols]

 1 wireless loudspeaker repeater 2 demodulation circuit 3 demodulation wave oscillation selection circuit 4 reception antenna 5 modulation circuit 6 modulation wave oscillation selection circuit 7 transmission amplifier 8 transmission antenna 9 voice amplification circuit 10 loudspeaker 11 external voice input terminal 12 voice output terminal 21 switching Switch 31 Audio audible range

Claims (4)

[Claims] 1. A demodulation circuit for demodulating a received radio wave at one frequency of predetermined predetermined demodulation waves and a voice band signal output from the demodulation circuit of a predetermined arbitrary modulation wave. A modulation circuit for modulating at one frequency among the above, a transmission amplification circuit for transmitting the output from the modulation circuit with a predetermined power, and a voice amplification circuit for amplifying a voice band signal output from the demodulation circuit. And a loudspeaker (speaker) for converting the output of the voice amplification circuit into voice. 2. A voice output unit for extracting a signal in a voice band to the outside of the wireless voice relay device instead of the voice amplifier circuit and the loudspeaker.
The described wireless loudspeaker repeater. 3. A changeover switch circuit is provided between the output of the demodulation circuit and the inputs of the modulation circuit and the voice amplification circuit, and the changeover switch allows the output of the demodulation circuit and the input of a voice band signal from outside the wireless voice repeater. The output of the external audio input terminal to be used is switched and used.
The described wireless loudspeaker repeater. 4. A demodulation wave oscillation selection circuit for setting a demodulation wave is provided in the demodulation circuit, and a modulation wave oscillation selection circuit for setting a modulation wave is provided in the modulation circuit, which are interlocked with each other. The wireless loudspeaker repeater according to claim 1, 2 or 3, wherein when the frequency of the demodulated wave is set, the frequency of the predetermined modulated wave different from the frequency of the demodulated wave is set.