JPH02260900A - Voice signal input changeover device in electronic device - Google Patents

Abstract

PURPOSE:To avoid useless investment and low power consumption by connecting an input terminal of a changeover means provided for switching an external audio input signal to plural external audio signal input terminals individually and its output terminal to a speaker output terminal. CONSTITUTION:Input terminals 61-6i of a changeover means 5 provided for switching an external audio input signal are connected individually to plural external audio signal input terminals 41-4i and its output terminal 7 is connected to an external speaker output terminal 8 to output an external audio input signal selectively to the external speaker output terminal 8. Thus, the speaker 9 is used in common to save the space and the duplicate investment onto the speaker is avoided and also the audio signal inputted from external electronic equipments 21-2i does not pass through an audio signal path with a high impedance such as an amplifier but is switched directly by a changeover switch, then power consumption is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The details of the audio signal input switching device in the electronic device of the present invention will be explained according to the following items.

A. Field of industrial application B1 Overview of the invention C0 Background technology 1 Problem to be solved by the invention E1 Means for solving the problem F. Examples of practical hf [Figures 1 and 2] a. Basic configuration [FIG. 1] b. Specific configuration example [FIG. 2] G1 Effects of the invention (A. Field of industrial application) The present invention relates to an audio signal input switching device in a novel electronic device. Specifically, when using multiple electronic devices such as audio equipment and video equipment that have at least an audio signal processing circuit, audio signal input in a new electronic equipment that can share one set of speakers between them. The present invention attempts to provide a switching device.

(B. Summary of the Invention) The audio signal input switching device for an electronic device of the present invention is an audio signal input switching device for an electronic device including a plurality of external audio signal input terminals and one or a set of external speaker output terminals corresponding thereto. An input switching device, in which the input side terminals of a switching means provided for switching external audio input signals are individually connected to the plurality of external audio signal input side terminals, and the output side terminals are connected to the external speaker output terminals. , and the external audio input signal is selectively output to the external speaker output terminal.This allows one set of speakers to be shared between multiple electronic devices. It is possible to save power by directly switching a plurality of external audio signals using a switching means without going through a high impedance audio signal path such as an amplifier.

(C. Background Art) Generally, audio equipment, video equipment, etc. are equipped with a built-in speaker, and are also provided with an external speaker output terminal so as to enable output to an external speaker.

For such devices, you can connect the external speaker output terminal to the connection terminal of the external speaker to use the external speaker as a dedicated speaker device for the device, or to selectively connect multiple sets of external speakers. It is often used by switching.

(D. Problem to be solved by the invention) By the way, in the above-mentioned devices, each electronic device requires a large number of dedicated speaker devices, and there is a problem of securing a place to install them, and the need to use the same speaker device. Even in cases where a speaker device can be shared among a plurality of devices, a similar speaker device is required, resulting in unnecessary investment.

So, for example, like component stereo,
Audio signals are switched through a high impedance audio signal path such as an amplifier that is interposed between multiple audio signal output devices such as record players, tape recorders, tuners, etc. and a set of speaker devices, and output to the same speaker device. It is also possible to do so.

However, with this method, it is necessary to constantly supply power to the amplifier when the device is in use, leaving another problem in that it is not possible to achieve power savings.

(E. Means for Solving the Problems) Therefore, in order to solve the above problems, the audio signal input switching device in the electronic device of the present invention includes a plurality of external audio signal input side devices and one or a set of external speaker output terminals, and the input side terminals of the switching means provided for switching the external audio input signal are individually connected to the plurality of external audio signal input side terminals, and the output side terminals thereof are provided. is connected to an external speaker output terminal, and an external audio input signal is selectively output to the external speaker output terminal.

Therefore, according to the audio signal input switching device for electronic equipment of the present invention, a plurality of external audio input terminals and one or a set of external speaker output terminals corresponding thereto are connected to each other via a changeover switch so as to be freely switchable. As a result, a small number of speaker devices can be shared among a large number of electronic devices, so there is no need to install a speaker device for each electronic device, which saves space and avoids duplicative investment in speaker devices. Of course, the audio signal input from an external electronic device can be directly switched by a changeover switch without going through a high impedance audio signal path such as an amplifier, so that an electronic device equipped with the audio input switching device according to the present invention can be used. Even when a device is not powered on, it is possible to use an electronic device connected to the device to output its audio output signal to a common speaker device, thereby saving power.

(F. Embodiment) [FIGS. 1 and 2] Details of the audio signal input switching device in the electronic device of the present invention will be described below according to the illustrated embodiment.

(a. Basic Configuration) [FIG. 1] FIG. 1 shows the basic configuration of an audio signal input switching device in an electronic device of the present invention.

In the figure, 1 is an audio signal input switching device.

21 (i=1.2.3,...) is an electronic device C that has at least an audio signal processing circuit, hereinafter referred to as rAVAV device), and includes audio devices such as audio tape recorders and compact disc players, and television receivers. In addition to video equipment such as cameras and video tape recorders, this concept also includes additional devices such as amplifiers and selectors.

31 (i=1.2.3,...) is an audio signal output terminal, and the AV equipment 21 (i=1.2.3,...) is an audio signal output terminal.
) are provided respectively. Note that the subscript "ri" attached to the code "3" indicating this audio signal output terminal (i=1.2
．． 3,...) are the AV equipment 21 (i=1.2.
It means that there is a relationship corresponding to the subscript "i" of 3, .

4, (i=1.2.3,...) are audio signal input side children, each of which is connected to the AV equipment 2° (i=1.2.3,...
・) Audio signal output terminal 31 (i=1.2.3, ・
) are connected separately to each other.

5 is a changeover switch configured as a multiplexer;
It is constructed using relays, semiconductor switch elements, etc., and its input side terminal 61 (i=1.2.3,...)
The above audio No. 13 input side child 41 (i=1.2.3,...
) are connected separately.

7 is an output side terminal of the changeover switch 5, and is connected to a control terminal of a speaker 9 via a speaker output terminal 8.

In addition, as an embodiment of this changeover switch 5, as shown by the two-dot chain line in FIG.
AV equipment: 21
(i=1.2.3, . . . ).For example, as shown by the dashed line in the same figure, the changeover switch 5 can be installed in any of the AV equipment 2. In the case where the audio input side child 4 excluding the voice input side child 41, (i
=2.3,...) becomes the external speaker input side child.

10 is a switching circuit, which connects the AV equipment 2. (i=1.2.3
,...), the changeover switch 5 is activated.
It is provided to perform switching control. In addition, AV equipment 2. The switching signal from (i=1.2.3,...) may be, for example, a signal synchronized with each power immersion operation, a signal from a selection switch provided on the device, or a video signal or audio signal output. It is possible to use signals obtained by detecting the presence or absence of AV equipment 2. (1, 2, 3,...
As a means of transmitting the switching signal from ) to the switching circuit 10, an electric line, an electric Ell wave, an optical transmission line, etc. are used. Also,
As the switching circuit 10, for example, it is possible to configure a last input priority circuit so that the latest one of the switching signals is preferentially adopted, or it is possible to arbitrarily change the priority order of the switching signals. It may be configured using a programmable logic circuit or the like.

(b. Specific Configuration Example) [FIG. 2] FIG. 2 shows an example of implementation in which the audio signal input switching device 1 in the electronic device of the present invention is applied to a two-channel audio main amplifier 11. Although not shown, the main amplifier 11 is configured to receive audio signals from other AV equipment.

In the figure, 12 and 12' are external speaker input terminals provided in the main amplifier 11, 12 is an L channel signal input terminal, and 12' is an R channel signal input terminal. In the following, the parts related to the R channel signal path will be denoted by the same parts as those in the L channel signal path with a ``' added to them.

And these external speaker input side terminals 12, 12'
are individually connected to external speaker output terminals 14 and 14' provided on an AV device, for example, a television receiver 13, via connection cords 15 and 15'.

16.16'' is a changeover switch, which corresponds to the changeover switch 5 of the audio signal input switching device 1 described above.

17a and 17b are input side terminals of the L channel A No. 8 changeover switch 16, one of which 17a is connected to the external speaker input side 12, and the other 17b is input with the L channel amplifier output of the main amplifier 11. It looks like this.

17'a and 17'b are R channel signal selection switch 1
6', one of which 17'a is connected to the external speaker input terminal 12', and the other 17'b receives the R channel amplifier output of the main amplifier.

18 and 18' are the output side terminals of the changeover switches 16 and 16', respectively, and the speaker output terminal 1 of the main amplifier 11.
9.19' are connected to each other separately.

20 and 20' are each a speaker, and the speaker 2
0.20' are connected to the speaker output terminals 19, 19' of the main amplifier 11 via connection cords 21, 21', respectively.

22 is a switching control circuit, which outputs a signal synchronized with turning on the power switch 23 of the main amplifier 11, or
1 is provided to generate a predetermined switching signal in response to a signal when the selection switch 24 provided in the switch 1 is pressed after power is turned on, and to control the switching operation of the changeover switches 16 and 16'. That is, when the changeover switch 16, 16' is not receiving a changeover signal from the changeover control circuit 22, the changeover switch 16, 16' is connected to the external speaker input terminal 12 as shown by the solid line in FIG.
．． 12' and external speaker output terminals 19 and 19' are connected, so that the two-channel audio signal output from the television receiver 13 is outputted through the speakers 20 and 20', respectively. Then, by turning on the power switch 23 of the main amplifier 11 or by pressing the selection switch 24 thereafter, the switching control circuit 22 selects the changeover switch 16.
When a switching signal is sent to the selector switch 16.
16' is switched as shown by the broken line in FIG. 2, and the amplifier output of the main amplifier 11 is output to the speakers 20 and 20', respectively.

According to the above-described main amplifier 11, one set of speakers 20 is connected to the plurality of AV devices connected to the main amplifier 11.
．． 20' can be shared, and even when power is not supplied to the main amplifier 11, the audio signal of the television receiver 13 can be outputted through the speakers 20 and 20', resulting in power saving. It is possible to aim for

(G. Effects of the Invention) As is clear from the above description, the audio signal input switching device in the electronic device of the present invention includes a plurality of external audio signal input side devices and one or a set of external audio signal input devices corresponding to these. An audio signal input switching device for an electronic device equipped with a speaker output terminal, wherein the input side terminal of a switching means provided for switching an external audio input signal is connected to each of the plurality of external audio signal input side terminals. At the same time, the output side terminal is connected to an external speaker output terminal, so that an external audio input signal is selectively output to the external speaker output terminal.

Therefore, according to the audio signal input switching device for electronic equipment of the present invention, it is possible to save space by sharing speakers and avoid duplicative investment in speakers, and the audio signals input from external electronic equipment can be Since switching can be performed directly with a changeover switch without going through a high-impedance audio signal path such as the It is possible to output the audio output signal to a common speaker device using the electronic device that has been installed, and it is possible to save power.

Furthermore, according to the audio signal input switching device for electronic equipment of the present invention, in addition to the above-mentioned effects, even if multiple sets of speaker devices are already prepared for each electronic equipment, these do not become completely unnecessary. Instead, it becomes possible to use the speaker device from multiple angles, such as using one of the two sets of speaker devices as a main speaker and the other set as a rear beaker for surround sound so that realistic sound can be heard.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining the basic configuration of the audio signal input switching device in the electronic device of the present invention, and FIG. 2 is a block diagram showing an example of a specific configuration of the audio signal input switching device in the electronic device of the present invention. It is. Explanation of symbols 1...Audio signal input switching device in electronic equipment, 2, (i=1.2.3,...)...Electronic equipment, 41 (i=1.2.3,... )...External audio signal input side terminal, 5...Switching means, 81 (i=1.2.3,...)...Input side terminal (of the switching means), 7...(Switching means) 8... External speaker output terminal, 11.13... Electronic equipment, 12.12'... External audio signal input side terminal, 16.16
'...Switching means, 17g, 17'a, 17b, 17'b・=Input side terminal (of the switching means), 18, ta'... Output side terminal (of the switching means), 19.19'・・・Application for external speaker output end
Man

Claims (1)

[Scope of Claims] An audio signal input switching device for an electronic device equipped with a plurality of external audio signal input terminals and one or a set of external speaker output terminals corresponding thereto, the switching device for switching external audio input signals. The input side terminals of the switching means provided for this purpose are connected individually to the plurality of external audio signal input terminals, and the output side terminals thereof are connected to the external speaker output terminal, so that the external audio input signal is selectively output to the external speaker. An audio signal input switching device for an electronic device, characterized in that the audio signal is output to an output terminal.