JP2958938B2 - Speaker control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker control system, and more particularly to a loudspeaker control system for controlling a center output and front and rear outputs.

[0002]

2. Description of the Related Art As a vehicle-mounted speaker system, there is a six-speaker system in which a center channel, a front channel, and a rear channel are respectively provided with L-channel and R-channel speakers. In this type of six-speaker system, the front and rear outputs from the sound source are adjusted in volume via an electronic volume and input to a mute circuit.
The center output from the sound source is directly input to the mute circuit. The mute circuit performs mute processing on the center output and the front and rear outputs as necessary, and outputs the result to the center speaker, the front speaker, and the rear speaker.

[0003]

As described above, the conventional 6
In the speaker system, the output to the center speaker,
Since the front and rear speaker outputs were not connected and controlled, it was not possible to increase or decrease the overall output level while maintaining the current output difference between the center, front and rear.

Further, since the mute circuit is commonly used, the mute is applied to the center output when the front and rear outputs are fully stopped, so that only the center output cannot be output.

It is an object of the present invention to provide a speaker control system capable of increasing or decreasing the overall output level while maintaining the output balance of three outputs and six speakers.

[0006]

In order to solve the above-mentioned problems, a speaker control system according to the present invention comprises a first electronic volume unit for adjusting a volume of a center output signal from an audio source, a front electronic volume unit from the audio source, and a first electronic volume unit. A second electronic volume control for adjusting the volume of the rear output signal;
A first mute circuit for muting output characteristics from the first electronic volume unit, a second mute circuit for muting output characteristics from the second electronic volume unit, and the first and second mute circuits. And a control unit that controls the first and second mute circuits.
The control unit is configured to provide an offset value to a control signal of the first electronic volume unit and the control signal of the second electronic volume unit, and to simultaneously control the first electronic volume unit and the second electronic volume unit. You.

[0007]

According to the present invention, the volume of the center output signal is adjusted by the first electronic volume section, and the volume of the front and rear output signals is adjusted by the second electronic volume section. Mute processing by the mute circuit, the control section provides an offset value to the control signal of the first electronic volume section and the second electronic volume section, and the first electronic volume section and the second electronic volume section Control at the same time.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration block diagram showing one embodiment of a six-speaker system according to the present invention. From a sound source 1 such as a tape recorder, a CD player, or a tuner, a center signal, a front signal, and a rear signal are output to the electronic volume units 4 and 5. Electronic volume unit 4
And 5 control the volume of the input signal under the control of the system microcomputer 2 which receives the operation signal from the key 3.
An output signal from the electronic volume 4 is subjected to mute processing by a mute circuit 6, amplified by an amplifier 8, and supplied to a center speaker 11. The front and rear output signals from the electronic volume unit 5 are supplied to a mute circuit 7.
, And is amplified by the amplifiers 9 and 10 and supplied to the front speaker 12 and the rear speaker 13, respectively. The ON / OFF operation of the mute circuits 6 and 7 is similarly controlled by the system microcomputer 2 in response to a key input.

FIGS. 2 and 3 show flowcharts of the operation processing procedure in the embodiment of the present invention. First,
Key 3 audio UP key or DOWN key is ON
It is determined whether the adjustment has been performed (step S1). If the switch has not been turned on, the process is terminated as it is. If the switch has been turned on, it is determined whether or not the front and rear volume adjustments have been made (step S2). If the front and rear volume adjustments are performed, it is determined whether or not the audio UP key is ON (step S3), and if it is ON, it is determined whether the volume value is the maximum value (MAX) (step S4). ). If it is the maximum value in step S4, the process is terminated as it is,
If it is not the maximum value, the volume is increased by +1 step (increased by one step) (step S5), and then an electronic volume control process is performed (step S6), and the process ends.

In step S3, if the audio UP key is not ON, it is determined whether or not the volume value is minimum (MIN). If it is MIN, the process is terminated. After one step (step down) (step S8), an electronic volume control process is performed (step S9), and the process ends.

If it is determined in step S2 that the front and rear volume adjustments have not been made, it is determined whether or not the center adjustment has been made (step S10). If not, the process is immediately terminated. It is determined whether or not the key is ON (step S11). If the audio UP key is ON, it is determined whether the center offset value is MAX (step S1).
2) If it is MAX, the process is terminated as it is, and
If not, the center offset value is incremented by one step (step S13), the electronic volume control process is performed (step S14), and the process ends.

In step S11, the audio UP
If the key is not ON, the center offset value is MIN
It is determined whether or not this is the case (step S15). If it is MIN, the process is terminated as it is.
6) Perform electronic volume control processing (step S
17), end the process.

FIG. 3 shows the electronic volume control processing procedure. First, it is determined whether or not the volume value is MIN. If the volume value is MIN, the mute circuit is turned on (step S22). If the volume value is not MIN, the mute circuit 7 is turned off (step S22). S
23) The volume value is converted into transmission data (step S24). Next, the transmission data is transmitted to the electronic volume unit 5 (step S25), and the volume value and the center offset value are added (step S26).
It is determined whether it is equal to or less than IN (step S27). Here, if it is not more than MIN, the added value is forcibly set to the MIN value (step S28), and the mute circuit 6 is turned on (step S29). In step S27, MIN
If not, it is determined whether or not the added value is equal to or greater than MAX (step S30). If it is not less than MAX, the added value is forcibly set to the MAX value (step S31), and the mute circuit 6 is turned off. (Step S32). Step S
If it is determined in step 30 that the added value is not equal to or greater than MAX, the process proceeds to step S32.

After executing the processing of steps S29 and S32, the added value is converted into transmission data (step S33),
The transmission data is transmitted to the electronic volume unit (step S
34), end the process.

By the above processing, the center and the front,
Since the rear output signal can be muted separately, the front and rear outputs can be turned off to sound only the center, or conversely, the center output can be turned off and only the front and rear sounds can be sounded. Therefore, when a subwoofer is connected to the center output, only the center can be sounded, and only the bass can be output by turning off the center, and only the treble can be output by turning off only the center, and the user can enjoy his favorite sound. In addition, it is possible to have the offset values of the front and rear volumes as internal data of the center, and to output the value added to the volume value so that they can be linked to each other, thereby breaking the current output balance of three outputs and six speakers. Without increasing or decreasing the overall level.

Further, the center, the front and the rear can be linked to each other, which can be realized by internal processing by a program of a microcomputer, and there is no need to change hardware.

[0017]

As described above, according to the speaker control system of the present invention, independent mute can be applied to the center, front and rear signals.
It is possible to adjust the overall level while maintaining the output balance.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing one embodiment of a six-speaker system according to the present invention.

FIG. 2 is a flowchart of an operation processing procedure in the embodiment of the present invention.

FIG. 3 is a flowchart of an operation processing procedure of the electronic volume unit in the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 sound source 2 system microcomputer 3 key 4, 5 electronic volume 6, 7 mute circuit 8, 9, 10 amplifier 11, 12 speaker

Claims (1)

(57) [Claims] 1. A center output signal from an acoustic source is volatilized.
A first electronic volume unit for adjusting the volume, and an acoustic source
Volume adjustment of front and rear output signals from
A second electronic volume unit;ElectronicMute output characteristics from volume section
A first mute circuit for processing;ElectronicBoliu
A second mue for muting the output characteristic from the
Circuit andThe first and second electronic volume units and the first and second
A control unit for controlling the shut-down circuit;  WithThe control unit includes a first electronic volume unit and a second electronic volume unit.
Providing an offset value in the control signal of the child volume unit,
The first electronic volume unit and the second electronic volume unit
Sometimes control Characterized bySpeaker control system.