Sound signal reproducing apparatus

Details Sound signal reproducing apparatus Sound signal reproducing apparatus

2006-09-19

2006-09-19

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Loudspeaker feedback

C381S102000, C381S106000, C381S107000, C381S028000, C330S251000, C330S20700P

Reexamination Certificate

active

07110555

ABSTRACT:
A sound signal reproducing apparatus for supplying sound signals of a plurality of channels to speakers via sound amplifier circuits includes: a power supply voltage controller for controlling a power supply voltage to the sound amplifier circuits; a plurality of filter circuits for passing predetermined frequencies of the output signal of each of the sound amplifier circuits in the plurality of channels; a plurality of level detection circuits for detecting levels of output signals of the plurality of filter circuits; an adder circuit for adding output signals of the plurality of level detection circuits; and a comparator circuit for comparing an output signal of the adder circuit with a reference level, so that an output signal of the comparator circuit controls the power supply voltage controller.

REFERENCES:
patent: 5550925 (1996-08-01), Hori et al.
patent: 5834977 (1998-11-01), Maehara et al.

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