Apparatus with speaker

Details Apparatus with speaker Apparatus with speaker

2011-07-05

2011-07-05

Fureman, Jared J (Department: 2836)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Plural converters

Reexamination Certificate

active

07973429

ABSTRACT:
An apparatus includes two DC/DC converters including two conversion circuits for converting a power supply voltage to first and second output voltages, respectively, two driving circuits for driving the respective conversion circuit based on first and second pulse wave modulated signals, and two pulse width modulation circuits for performing pulse width modulation on a thinned wave signal formed from a first wave signal and on a second wave signal to generate the pulse wave modulated signals, respectively. One DC/DC converter includes a thinning circuit for removing portions of a first wave signal to form the thinned wave signal. The apparatus includes a speaker for generating sound by inputting a signal based on the voltages.

REFERENCES:
patent: 6437545 (2002-08-01), Sluijs
patent: 7560914 (2009-07-01), O'Driscoll et al.
patent: 7847532 (2010-12-01), Potter et al.
patent: 2005/0280312 (2005-12-01), Litovsky et al.
patent: 10-248238 (1998-09-01), None
patent: 2000-252914 (2000-09-01), None
patent: 02/03534 (2002-01-01), None

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