JPS614399A - Loudspeaker - Google Patents

Abstract

PURPOSE:To make reproduced sound easily audible to audients in front and back by constituting a loudspeaker of the first voice amplifying device consisting of an amplifier, built-in speaker and the second voice amplifying device consisting of an amplifier, external speaker socket and an external speaker. CONSTITUTION:When using the device in a relatively narrow place, signals from a signal source 10 are amplified to a level that can sound a speaker by amplifiers 11, 12, and a built-in speaker 13 is sounded by a signal from the amplifier 13, and at the same time, a built-in speaker 16 is sounded by the signal of the amplifier 12 that passes through an external speaker socket 14. When using in a widely opend place, the built-in speaker 16 is cut off, and at the same time, an external speaker 17 can be sounded by inserting an external speaker plug 15 into the external speaker socket 14.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a public address system for monaural audio equipment such as microphone amplifiers, tape recorders, and cassette tape recorders with radio receivers.

Conventional configurations and their problems In general, monaural audio equipment is required to be able to be used not only in narrow spaces, but also in relatively large spaces such as gymnasiums and lecture halls. Such loudspeaker systems for monaural audio equipment have traditionally been widely used in some special markets such as schools.Among them, monaural tape recorders are very often used. A conventional loudspeaker system for a monaural tape recorder will be explained with reference to FIG. 3 is a speaker, and 4 is an external speaker socket.In this configuration, the signal from signal source 1 is amplified by amplifier 2, and the built-in speaker 3 is used for sound. If you want to hear the sound, just take out the signal from external speaker socket 4 (.

FIG. 2 shows the configuration of a monaural Ω tape recorder loudspeaker system using BTL connections to produce a large output even when the power supply voltage is low as a special case. In the figure, 5 is a signal source, 6 is a positive phase amplifier, 9 is a built-in speaker, 8 is an external speaker socket, and 7 is a negative phase amplifier. In such a configuration, the signal from the signal source 5 is amplified by the positive-phase amplifier 6 and the negative-phase amplifier 7, and the speaker 9 is made to sound with the added output of each.

If you want to use external speakers, use external speaker kit 8.
The more signals you can get, the better.

However, with the above configuration, when playing in a large place such as a classroom or gymnasium, there is only one speaker, so the sound source is in one place, and people in the front can hear it well, but people in the back can hear it well. had the disadvantage that it could not be heard very well.

Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a public address system in which reproduced sound can be heard clearly by both people in the front and people in the rear even when the loudspeaker is used in a wide place. That is.

Structure of the Invention In order to achieve this object, the loudspeaker system of the present invention provides a first loudspeaker system comprising an amplifier and a built-in speaker.
and second amplification means consisting of an amplifier, an external speaker socket and an external speaker. With this configuration, when used in a relatively large place, the external speaker installed at the rear is sounded by the signal from the external speaker socket, and one built-in speaker at the front is sounded on each side, creating two sound sources, and the loudness of the sound varies depending on the location. It is possible to improve the unbalance of the sound and make it possible for both people in front and behind to hear the reproduced sound better.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows a configuration diagram of a loudspeaker in an embodiment of the present invention. In Fig. 3, 1o is a signal source, 11.12 is an amplifier, 13.16 is a built-in speaker,
14 represents an external speaker socket, 15 represents an external speaker plug, and 17 represents an external speaker.

In the loudspeaker system configured as described above, first, when using it in a relatively narrow place, the signal from the signal source 10 is amplified to a level that can make the loudspeaker sound by the amplifiers 11 and 12, and the signal from the amplifier 11 is At the same time as the signal causes the built-in speaker 13 to sound, the signal from the amplifier 12 passes through the external speaker socket 14 and causes the built-in speaker 16 to sound. On the other hand, when it is intended to be used in a large place, by inserting the external speaker plug 15 into the external speaker socket 14, the built-in speaker 16 can be disconnected and the external speaker 17 can be sounded at the same time.

As described above, according to this embodiment, the output of one of the two independent systems of loudspeaker means can be taken out to the outside through the external speaker socket, so that changes in output power due to fluctuations in external speaker impedance can be reduced to 1. It is possible to limit the sound to only one channel, and also to create two sound sources by playing the built-in speaker and external speaker.

Effects of the Invention As described above, the present invention provides two sound sources by providing a first sound amplification means for amplifying the same signal and a second sound amplification means equipped with an external speaker connector for sounding an external speaker. It creates a sound field that reduces the unbalance of sound volume even in a wide place, and provides a sound field where the reproduced sound can be easily heard by both the person in front and the person behind, and its practical effects are great. .

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional loudspeaker system, Figure 2 is a conventional BT
FIG. 3 is a block diagram of a loudspeaker according to an embodiment of the present invention. 10...Signal source, 11.12...Amplifier, 13.16...Built-in speaker, 14...
...External speaker socket, 15...External speaker plug, 17...External speaker. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (1)

[Claims] An external speaker connector is provided on either of the two independent systems of loudspeaker means for amplifying the same signal, and the output of one of the loudspeaker means is switched to the external speaker from the built-in speaker by the external speaker connector. A public address system characterized by comprising: