JPH0260333A - Private branch broadcasting device - Google Patents

Abstract

PURPOSE:To receive a frequency signal specified beforehand with a special speaker out of plural speakers serially arranged into the same system by providing a receiving circuit, etc., to receive a special frequency signal at the special speaker. CONSTITUTION:In an ordinary use condition, a BGM sent from a BGM sound source 17 flows at plural speakers 11 and 12. When a certain special information is to be sent only to a special area, the signal transmitted from a remote mike 16 is converted to the receivable frequency of a special speaker 12 arranged at the area by an FM modulating converter 15 and transmitted with one side conductor of a coaxial cable 13. At the speaker 12, the transmitted special frequency signal is received by a receiving circuit 18, amplified by an amplifier 19 and outputted. Consequently, in plural speakers arranged serially in the same system, the BGM continuously flows from a speaker 11 and the special information can flow from the speaker 12 arranged at a certain special area.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a public address system equipped with a plurality of speakers, and in particular, a specific speaker among the plurality of speakers is connected to a predetermined specific speaker. The present invention relates to a public address system capable of receiving frequency signals.

(Conventional technology) In premises such as office buildings, factories, department stores, and schools, where many people are distributed in designated areas, it is difficult to effectively transmit information and provide background music (BGM). For this purpose, a plurality of speakers are appropriately placed at predetermined positions.

These plurality of speakers are usually arranged in series with each other, and the plurality of speakers of the same system connected by the same wiring are configured so that the same information or music is played.

(Problems to be Solved by the Invention) In the conventional public address system as described above, for example, even when it is desired to convey certain information only to people located in a certain area, the information is transmitted to people within the same system. It is often played from multiple speakers at the same time, causing noise to people who do not need the information, and causing discomfort by interrupting BGM.

The present invention has been made in consideration of these points,
Among multiple speakers arranged in series in the same system,
A specific speaker is intended to provide a public address system capable of receiving predetermined frequency signals.

[Problem of invention]

(Means for Solving the Problems) The present invention is a public address system having a plurality of speakers arranged in series, and in which a specific speaker among the plurality of speakers receives a predetermined specific frequency. It is characterized by a separate built-in circuit.

(Function) According to the present invention, specific information can be transmitted only to a specific speaker within the same system. This makes it possible, for example, to continue playing BGM within the system while transmitting necessary information from a speaker located at a specific location only to people located in that specific area.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an overall circuit diagram showing an embodiment of a public address system according to the present invention. In the figure, reference numerals 11 and 12 indicate speakers, which are connected in series through wiring 13, respectively. These plurality of speakers 11, 12 are arranged, for example, on a certain floor of an office building.

Reference numeral 14 is an amplifier, and an FM modulation converter 15 is connected to the input side of the amplifier 14. The FM modulation converter 5 is a means for sending information to the speakers 11 and 12,
For example, a remote microphone 16 and a BGM sound source source 17 are connected.

Further, in this embodiment, a coaxial cable is used as the wiring 13, and either the inner conductor or the outer conductor of the coaxial cable is connected to the normal speaker 11, and both of them are connected to a specific speaker 12 capable of receiving a specific frequency signal. It is connected to the.

FIG. 2 is a circuit diagram showing an embodiment of the specific speaker 12 according to the present invention. In addition to the normal speaker 11, the specific speaker 12 includes a receiving circuit 18 that receives a specific frequency signal, and a receiving circuit 18 that amplifies the received signal. It has a built-in amplifier 19. Reference numeral 2] is an LED (light emitting diode) that indicates a state in which a specific frequency signal is being received. Power supply for the amplifier 19 of the specific speaker 12 (for example, 12VDC
) is supplied using a coaxial cable 13.

The operation of this embodiment having such a configuration will be explained.

Under normal use conditions, multiple speakers 11.1
2, BGM sent from the BGM sound source 17 is played. When you want to send certain special information only to a specific area, for example, when you want to send necessary information only to a specific business person, the signal transmitted from the remote microphone 16 is transmitted to the FM modulation converter 15 and placed in that area. The signal is converted to a frequency receivable by the specific speaker 12 and transmitted using one conductor of the coaxial cable 3. The specific speaker 12 receives the transmitted specific frequency signal using the receiving circuit 18, amplifies it with one amplifier, and outputs specific information from the speaker 11. At this time, the BGM signal continues to be transmitted through the other conductor of the coaxial cable 13, so the BGM signal that is normally transmitted from the other speakers 11
will not be interrupted.

Therefore, among multiple speakers of the same system, special information is played from the specific speaker 12 placed in a certain specific area, but this special information is not played from the other speakers 11, and BGM is continuously played. It will be done. Such an effect can be used as a special information transmission broadcast, such as a call broadcast for a person located in a specific area, or a special service order broadcast.

In this embodiment, a method is shown in which a coaxial cable is used as a means for supplying power to the specific speaker 12, but a method in which the specific speaker 12 is directly connected to an external power source is also possible. Furthermore, although a method of using an FM signal as a means for sending special information signals has been shown, a PCM conversion converter may be used instead of the FM modulation converter 15 to send digital signals. Optical signals can also be sent using fiber optic cables.

Furthermore, the types of signal frequencies that can be received by the specific speaker 12 may be increased, for example, a specific speaker may be 70.
7MH2 frequency signal, other specific speakers 68.
By making it possible to receive each of the 4 MIIZ frequency signals, more types of special information can be sent to each required area.

Furthermore, by incorporating a receiving circuit capable of receiving a plurality of frequency signals within the same specific speaker, the uses of the present device can be further expanded.

〔Effect of the invention〕

As described above, according to the present invention, special information can be broadcast from a speaker placed at a specific position among a plurality of speakers arranged in series.

Claims (1)

[Claims] In a public address system including a plurality of speakers arranged in series, a specific speaker among the plurality of speakers has a built-in receiving circuit for receiving a predetermined specific frequency signal. Public address system.