Electronic apparatus having audio output units

Details Electronic apparatus having audio output units Electronic apparatus having audio output units

2007-01-29

2011-10-04

Mei, Xu (Department: 2614)

Electrical audio signal processing systems and devices

With amplifier

C330S257000, C381S111000

Reexamination Certificate

active

08031888

ABSTRACT:
Two control voltages are generated, one increasing and another decreasing, in response to the rise of the voltage of a condenser of a common time-constant circuit. Based on the two control voltages, a first and a second currents are formed, from which four different combinations of currents are established. By feeding one of four combinations to each of multiple differential output amplifier circuits each having a feedback resistor, the multiple output amplifier circuits can be individually started up or shut down without generating popcorn noise, using only one single time constant circuit.

REFERENCES:
patent: 5420535 (1995-05-01), Nebuloni et al.
patent: 5642074 (1997-06-01), Ghaffaripour et al.
patent: 5682121 (1997-10-01), Naokawa et al.
patent: 5796303 (1998-08-01), Vinn et al.
patent: 6154094 (2000-11-01), Seven
patent: 6239655 (2001-05-01), Orozov et al.
patent: 7184561 (2007-02-01), Kato et al.

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