JPH0420295B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic monitoring device used for broadcasting equipment such as municipal disaster prevention wireless publicity and wired publicity.

There are various types of broadcasting equipment used for transmitting daily life information and as a means of communication in the event of an emergency, but radio publicity equipment as shown in FIG. 1 is common. In this equipment, in the master station equipment 1, the voice signal transmitted by the announcer is converted into an electrical signal by the microphone M, the power is amplified to a predetermined level by the amplifier AMP, and the transmitter Tx superimposes it on the radio wave and receives it. It is transmitted to slave station 2.
At this time, the master station 1 is often provided with a monitor device 3 for amplifying a part of the output of the amplifier AMP by a monitor amplifier M/MAP and listening to the content being broadcast from itself through a monitor speaker SP or headphones. .

On the other hand, in the receiving slave station 2, after demodulating the received signal, a trumpet speaker T.
Broadcasting will be carried out using SP to convey information to local residents.
In such outdoor loudspeaker broadcasting equipment, it is common to install a large number of receiver stations 2 at predetermined intervals, and these environments often include buildings and mountains. For this reason, there was a problem in that the sound emitted from the receiving slave station echoed on the mountain, or the sounds emitted from multiple receiving slave stations overlapped, creating echoes that were very difficult to hear.

Traditionally, to compensate for this deficiency, announcers were instructed to wait until the echo had disappeared before speaking the next phrase, but announcers generally did this in a broadcasting room that was acoustically isolated from the outside world. At present, it is difficult to understand the repercussions outside and is therefore almost ineffective.

In addition to the above-mentioned outdoor public address system, there is also an individual reception system in which a dedicated receiver is installed in each home as a reception slave station to listen to broadcasts, and both of these are often installed side by side.

If both of the above-mentioned systems are installed in parallel, the announcement method becomes extremely complicated. In other words, for outdoor loudspeaker broadcasting, it is necessary to be slow and slow as mentioned above, and for broadcasting to individual receivers, it must be done in a normal conversational tone, otherwise the sound will be boring. There was a problem in that making announcements using public broadcasting equipment was extremely difficult and required extensive training.

The present invention was made in order to solve the above-mentioned problems in conventional broadcasting equipment, and it adds an echo device to the above-mentioned monitor device installed in the broadcasting room to obtain a monitor output accompanied by an echo. An object of the present invention is to provide a monitor device that achieves the following.

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 2 is a block diagram showing an embodiment of a monitor device with an echo device according to the present invention.

In this figure, the output of the microphone M is amplified by the amplifier AMP and used as the modulation input of the transmitter Tx.
Echo circuit D with a new part of the AMP output
After the signal is amplified by the monitor amplifier M/AMP, it is converted into audio and monitored by the monitor speaker SP. The reverberation time of the echo circuit D can be arbitrarily varied by its circuit constants, and a monitor speaker
Make sure that the output of the SP does not go around to the microphone M and cause self-excited oscillation (howling).If the monitor speaker SP is replaced with a headphone and the announcer wears it and listens, there is no need to worry about howling. Needless to say.

In addition, as a measure to cope with the case where an outdoor loudspeaker slave station and an individual reception slave station are installed in parallel as described above, as shown in FIG. One of the changeover switches SW is connected to the input terminal of the echo circuit D, the other is connected to the output terminal of the echo circuit D, and the intersection of the two is connected to the monitor amplifier M.AMP.
Connect to the input end of That is, the changeover switch SW
Therefore, if the receiving equipment for broadcasting is an outdoor loudspeaker slave station, an echo may be added to the monitor output, and if the receiving equipment is an individual receiver, a normal monitor output without echo may be obtained.

In addition, if the broadcasting equipment has a selective calling device for selecting and operating the receiving equipment to be broadcast, if this selection operation and the operation of the changeover switch SW are linked, the echo will be automatically turned off. Can be switched.

By using the monitor device of the present invention configured as described above, if the receiving equipment for broadcasting is an outdoor loudspeaker system, an echo is added to the monitor output.
The announcer will broadcast slowly while listening to this. On the other hand, if the receiver to be broadcast is an individual receiver, no echo is added to the monitor output and you can hear the normal monitor output, so the announcer broadcasts in the normal manner and also monitors whether or not there is an echo in the monitor output. It is also possible to identify which receiver is the target of broadcasting.

Since the present invention is configured and operated as described above, when broadcasting while listening to the monitor output with added echo, the announcer can do so with a sense of realism as if listening to the sound echoing from a building or mountain outdoors. This naturally slows down the announcer's speech, allowing him to wait for the echo to disappear before uttering the next word.

Furthermore, according to the present invention, it is expected that even people who have not mastered special announcement techniques for outdoor public address broadcasting can easily make announcements in the optimal speaking style. Therefore, it is extremely effective in enabling accurate listening to disaster prevention public relations, etc.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional radio public relations system, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a block diagram showing a modification of the present invention. 1, 2, 3...Monitor Circuit block, AMP...
…Low frequency amplifier, Tx…Transmitter, D…Echo circuit, M・AMP…Monitor amplifier, SP…Speaker, T・SP…Trumpet speaker, SW
...Toggle switch.

Claims (1)

[Scope of Claims] 1. In a master station of broadcasting equipment that transmits audio signals to a public address system installed outdoors by wire or wirelessly for amplified broadcasting, one of the branches of the audio to be broadcast is delayed by a delaying means for the required time. 1. A master station equipment for loudspeaker broadcasting, characterized in that the equipment is configured so that the echo sound of the sound broadcasted from the loudspeaker device can be heard in a pseudo manner by monitoring it with a speaker or a headphone after the loudspeaker broadcasting. 2. The master station equipment for loudspeaker broadcasting according to claim 1, characterized in that a bypass circuit and a changeover switch are added to the delay means so as to monitor echo-free audio as necessary. 3. In the case where the broadcasting equipment uses radio to switch between outdoor loudspeaker broadcasting and individual reception broadcasting, a monitor that automatically adds echo sound during loudspeaker broadcasting in conjunction with the switching. The master station equipment for loudspeaker broadcasting according to claim 2, characterized in that it outputs the following.