Method and apparatus for improving the quality of AM compatible

Details Method and apparatus for improving the quality of AM compatible Method and apparatus for improving the quality of AM compatible

1996-02-20

1998-09-15

Vo, Don N.

Pulse or digital communications

Apparatus convertible to analog

455553, 455135, 329347, H04L 2500, H04L 2700

Patent

active

058090657

ABSTRACT:
A system and method are provided for reducing perceived distortion in an output audio signal derived from an amplitude modulated compatible digital broadcast signal having an analog portion and a digital portion. The digital portion of this signal is demodulated to produce a demodulated digital signal and the analog portion of the signal is demodulated to produce a demodulated analog signal. The noise in the demodulated digital signal is measured and an estimate of the signal-to-noise ratio is derived. This estimated signal-to-noise ratio is compared with a threshold level which is set at the minimum acceptable signal quality for the digital signal. Based upon the estimated signal-to-noise ratio, a switch directs either the analog derived audio output or the digitally derived audio output as the system output signal.

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