System and method for demodulating amplitude modulated signals

Details System and method for demodulating amplitude modulated signals System and method for demodulating amplitude modulated signals

2005-11-04

2009-08-04

Pascal, Robert J. (Department: 2817)

Demodulators

Amplitude modulation demodulator

C398S106000, C398S202000

Reexamination Certificate

active

07570109

ABSTRACT:
A system and method for demodulating amplitude modulated input signals uses two comparators and a charge pump circuit, which is positioned between the two comparators, to produce a demodulated signal of an amplitude modulated input signal. The two comparators and the charge pump circuit form a demodulating unit that may be a part of an infrared remote control receiver. The first comparator converts the input signal from a waveform to a pulse form. The charge pump circuit then converts the pulse signal into an integrated signal in a triangular pulse form. The second comparator converts the integrated signal from a triangular pulse form to a rectangular pulse form to produce the demodulated signal.

REFERENCES:
patent: 5883534 (1999-03-01), Kondoh et al.
patent: 6556330 (2003-04-01), Holcombe
patent: 6677732 (2004-01-01), Inoue et al.
patent: 6858830 (2005-02-01), Suzuki et al.
patent: 2005/0003786 (2005-01-01), Inoue et al.
patent: 2005/0152705 (2005-07-01), Inoue et al.

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