JP2003032800A - Speaker connection circuit device - Google Patents

Abstract

(57) [Summary] [Problem] An amplifier itself detects the connection state of a speaker,
The user listens to the most appropriate stereo method for the number of speakers without being aware of it. SOLUTION: A speaker driving means for self-determining whether a speaker is connected or not connected, a means for automatically changing a downmix method from the number of connected speakers and a method of multi-channel stereo sound to be reproduced, and connected. This is a speaker connection circuit device that includes an amplifying unit that performs a predetermined downmix from the number of speakers and a multi-channel stereo audio system to be reproduced and drives the speakers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver and an audio reproducing apparatus, and more particularly, when reproducing multi-channel stereo sound, it automatically detects the connection of speakers (loudspeakers) and determines the number of speakers. In regard to the technology effectively applied to the technology for converting to the optimum stereo method in.

[0002]

2. Description of the Related Art Conventionally, when the stereo system of a voice program to be reproduced is different from the number of speakers to be used, the user has conventionally selected the conversion system built in an amplifier (width increaser) or the like. For example, when listening to 5.1 ch type surround stereo with 2 speakers or 4 speakers without a center speaker, it is necessary to perform parameter setting work of the amplifier in order to downmix to each method.

FIG. 2 shows a conversion system built in the amplifier or the like. When the 5-channel stereo signal is reproduced only by the left and right speakers, in FIG.
Tilt 12 and 13 upwards, and then L signal, R signal, C signal, L
The S signal and the RS signal are added by the adder 14.

The L, R, C, LS and RS indicate position signals of the driven speakers 2a to 2e, respectively, and L (Lef
t) is the left signal, R (Right) is the right signal, C (center) is the center signal, LS (Left Surround) is the left rear signal, and RS (Right Su)
rround) Right rear signal.

When reproducing with four speakers omitting only the center speaker, only the switch 11 is turned up and the switches 12 and 13 are turned down to convert into a four-channel signal. Normally, the switches 11, 12, and 13 are controlled by a switch on the front panel of the amplifier or a remote controller. It is necessary for the user to operate the switches on the front panel and the remote control.

[0006]

However, in the conventional technique, only the user knows the connection state of the speaker, so that the user has to perform the conversion of the stereo system by himself. Therefore, it is extremely difficult for a user who is unfamiliar with the principle of reproducing stereophonic sound. For example, in extreme cases, the number of users who listen with 2 speakers may be 5
I sometimes listened to channel stereo without hearing the center or surround sound.

An object of the present invention is to provide a technique in which the amplifier itself detects the connection state of the speakers and allows the user to listen to an optimal stereo system in the number of the speakers without being aware of it. The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0008]

The outline of the invention disclosed in the present application will be briefly described as follows.
A first aspect of the present invention relates to a speaker driving means for self-determining connection / non-connection of a speaker, means for automatically changing a downmix method from the number of connected speakers and a multi-channel stereo audio system to be reproduced, and connection. The speaker connection circuit device is provided with: the number of speakers and a amplifying means that drives the speakers by performing a predetermined downmix from a multi-channel stereo audio system to be reproduced.

According to a second aspect of the present invention, in the speaker connection circuit device according to the first aspect, the speaker driving means detects a change in current or a change in capacitance by a detector connected to the output of the amplifier, and outputs the output of the amplifier. F) means for determining whether or not the speaker is connected.

That is, a detector connected to the output of the amplifier detects a change in current or a change in capacitance to determine whether or not a speaker is connected to the output of the amplifier. The information is sent to the downmix circuit before the amplifier. The down-mix circuit performs a predetermined format conversion from the information on the number and arrangement of the speakers and the stereo format information of the audio program to be reproduced, and sends the output signal to the amplifier circuit.

With this configuration, when the stereo system of the program and the speaker arrangement do not match, the stereo system is automatically converted, so that the user considers the number of speakers connected to the stereo system of the program. Then, the trouble of selecting the stereo system conversion is eliminated, and the stereo sound of any system is optimally reproduced in the number of speakers.

Hereinafter, the present invention will be described in detail with reference to the drawings together with embodiments (examples) according to the present invention.

[0013]

1 is a block diagram showing a schematic configuration of a speaker connection circuit device according to an embodiment of the present invention.
In this embodiment, as a typical example, the audio input unit is a 5-channel stereo.

In FIG. 1, 1 is a voice signal and speaker position signal input terminal, 2a to 2e are speakers (loudspeakers),
Reference numeral 3 is a downmix circuit (method conversion circuit), 4 is an amplifier (amplifier), 5 is a speaker connection detection circuit, and 6a to 6e are amplifier input terminals. L, R, C, LS and RS of the audio signal and speaker position signal input terminal 1 indicate position signals of the driven speakers 2a to 2e, respectively, and L (Lef
t) is the left signal, R (Right) is the right signal, C (center) is the center signal, LS (Left Surround) is the left rear signal, and RS (Right Su)
rround) Right rear signal.

The speaker connection circuit device of this embodiment is shown in FIG.
As shown in, the system conversion circuit (system conversion circuit) 3 is connected to the front stage of the amplifier (amplifier) 4. Furthermore, speakers (loudspeakers) 2a to 2e are provided in the subsequent stage of the amplifier (amplifier) 4.
It is assumed that only the speakers 2a and 2b corresponding to the left and right of the stereo are connected.

When the power is turned on, the speaker connection detection circuit 5 operates to detect which speaker is connected. The speaker connection detection circuit 5 inputs the detection result to the downmix circuit 3. The down-mix circuit 3 converts 5-channel stereo to 2-channel stereo, and among the amplifier input terminals 6a to 6e, the amplifier input terminals 6a and 6b.
To enter.

Specific configurations and operations of the downmix circuit 3 and the speaker connection detection circuit 5 will be described below. The configuration of the downmix circuit 3 of this embodiment is
Basically, it has the same configuration as that of FIG. 2 described above. However,
The switches 11, 12, and 13 are not switched from the front panel or the remote controller, but the speakers 2a to 2e connected to the output terminals of the amplifier 4 are detected by the speaker connection detection circuit 5, and the detection result is downmixed. It is input to the circuit 3 and automatically performed.

The speaker connection detection circuit 5 of this embodiment is means for judging whether or not the speakers 2a to 2e are connected to the output terminal of the amplifier 4, and the method is mechanical or electrical. There is something. The mechanical method is based on the positional relationship of the connector of the output terminal of the amplifier 4, and is effective when the connector is a horn jack or the like. The electrical method takes advantage of the generally low impedance of the speaker (on the order of 8 ohms). A weak voltage is applied to the output terminal of the amplifier 4 to detect a weak current flowing through the speaker connection, and the speaker 2a
~ 2e connection is determined. There are various means other than these, but the present invention does not limit the means.

As described above, the invention made by the present inventor is
Although the present invention has been specifically described based on the above-mentioned embodiments, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the scope of the invention.

[0020]

The effects obtained by the invention disclosed in the present application will be briefly described as follows.
According to the present invention, when the stereo system of the program and the speaker arrangement do not match, the stereo system is automatically converted. Therefore, the stereo system conversion is performed in consideration of the stereo system of the program and the number of connected speakers. There is no need to select the, and any type of stereo sound can be optimally reproduced with the number of speakers.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a speaker connection circuit device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration example of a conventional down-mix circuit (system conversion circuit).

[Explanation of symbols]

1 ... Audio signal and speaker position signal input terminal 2a to 2e ... speaker (loudspeaker) 3 Downmix circuit (method conversion circuit) 4 ... Amplifier 5 ... Speaker connection detection circuit 6a to 6e ... Amplifier input terminal L: Left signal R ... right signal C ... Central signal LS ... left rear signal RS ... right rear signal

Claims (2)

[Claims] 1. A speaker driving means for self-determining whether a speaker is connected or not, and means for automatically changing a down-mix method from the number of connected speakers and a multi-channel stereo audio system to be reproduced. A speaker connection circuit device comprising: a number of speakers and an amplification means for driving the speakers by performing a downmix predetermined from a multi-channel stereo audio system to be reproduced. 2. The speaker connection circuit device according to claim 1, wherein the speaker driving means detects a change in current or a change in capacitance by a detector connected to the output of the amplifier, and connects the speaker to the output of the amplifier. A speaker connection circuit device, comprising: means for determining the presence or absence of the speaker connection circuit device.