Programmable digital bandpass filter for a codec circuit

Details Programmable digital bandpass filter for a codec circuit Programmable digital bandpass filter for a codec circuit

2000-06-26

2009-12-29

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Pulse code modulation

Correcting or reducing quantizing errors

C375S244000, C375S253000, C375S254000

Reexamination Certificate

active

07639744

ABSTRACT:
A codec circuit having a programmable digital bandpass filter is disclosed. According to one aspect, a bandpass filter matches the filter characteristics of the codec circuit to a transmitted pulse code modulation (PCM) signal. The codec circuit includes at least one programmable digital high-pass filter connected in series to at least one programmable digital low-pass filter. The setting filter characteristics for the programmable digital high-pass and low pass filters are each set by means of a signal identification device for identifying a PCM signal transmitted through the codec circuit. The filters are set as a function of the transmitted PCM signal in order to vary a bandpass filter characteristic for the programmable digital bandpass filter.

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