SOUND REPRODUCING APPARATUS

Abstract

A sound reproducing apparatus is provided with a circuit comprising a first secondary phase shifter in a front stage of at least one of channels among a first power amplifier, a second power amplifier and a third power amplifier, and a second secondary phase shifter and an adder in at least one of remaining channels for providing an output by adding output signals of a music signal source and the second secondary phase shifter. The apparatus of this structure eliminates phase interferences between a center speaker and right and left speakers by controlling sound waves generated by the center speaker, thereby achieving excellent reproduction of music.

Description

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a system diagram for use in detailing a sound reproducing apparatus according to a first exemplary embodiment of the present invention;

FIG. 2 is a system diagram for use in detailing a sound reproducing apparatus according to a second exemplary embodiment of the present invention;

FIG. 3 is a system diagram for use in detailing a sound reproducing apparatus according to a third exemplary embodiment of the present invention;

FIG. 4 is a system diagram for use in detailing a sound reproducing apparatus according to a fourth exemplary embodiment of the present invention;

FIG. 5A is a graph showing a phase characteristic of a secondary phase shifter;

FIG. 5B is a graph showing a gain characteristic of the secondary phase shifter;

FIG. 6 is a graph showing a gain characteristic of an output obtained by adding an output signal of a second phase shifter and a music signal;

FIG. 7 is a graph showing a gain characteristic of an output obtained by adding an output signal of a second and a fourth phase shifters and the music signal;

FIG. 8 is a graph showing a gain characteristic of a center speaker obtained by changing a gain of a gain control stage;

FIG. 9 is a graph showing a gain characteristic of a notch filter;

FIG. 10 is a system diagram for use in detailing a conventional sound reproducing apparatus; and

FIG. 11 is a system diagram for use in detailing a drawback of the conventional art.

Claims

1. A sound reproducing apparatus comprising: a music signal source;at least three channels of power amplifiers for amplifying an output of the music signal source; andat least three speakers for reproducing music by outputs of the power amplifiers,wherein at least one channel of the power amplifiers has a front stage comprising at least one secondary phase shifter, andat least one of the remaining channels has at least one secondary phase shifter and an adder for providing an output by adding output signals of the music signal source and the phase shifter.

2. The sound reproducing apparatus of claim 1, wherein at least two channels of the power amplifiers have front stages, each comprising at least one secondary phase shifter, andat least one of the remaining channels comprises a secondary phase shifter and an adder for providing an output by adding output signals of the music signal source and the phase shifter.

3. The sound reproducing apparatus of claim 1 further comprising a gain control stage in a front side of the secondary phase shifter and the adder.

4. The sound reproducing apparatus of claim 2 further comprising a gain control stage in a front side of the secondary phase shifter and the adder.

5. The sound reproducing apparatus of claim 1 having a notch filter instead of providing the output by adding output signals of the music signal source and the phase shifter.

6. The sound reproducing apparatus of claim 2 having a notch filter instead of providing the output by adding output signals of the music signal source and the phase shifter.