Digital audio signal receiver

Pulse or digital communications – Repeaters – Testing

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Details

375 76, 307362, H04B 1404

Patent

active

050954962

ABSTRACT:
There is disclosed a digital audio signal reciever for preventing the generation of modulation noise in a D/A converted analog signal by eliminating Jitter effect occurring during transmission of digital audio data beforehand. The digital audio signal receiver includes an input selection circuit for selecting one of external digital audio signal soures, a first waveform shaping circuit for removing noise components of digital audio signals selected by the input selection circuit and shaping waveforms thereof, a first low pass filter for integrating the shaped waveform generated from the first waveform shaping circuit and adjusting the duty rate thereof, a second waveform shaping circuit for removing a DC noise component of the output waveform with duty rate adjusted by the first low pass filter and shaping the waveform thereof, a second low pass filter for monitoring duty rate of the output waveform of the second waveform shaping circuit to be at 50%, a comparator for providing feedback to the input terminal of the second waveform shaping circuit by comparing the output waveform of the second low pass filter with a reference voltage, and a demodulator for demodulating the output waveform of the second waveform shaping circuit back to original PCM audio data.

REFERENCES:
patent: 4307465 (1981-12-01), Gieller
patent: 4469082 (1984-09-01), Nishitoba et al.
patent: 4516247 (1985-05-01), Carsalade et al.
patent: 4701715 (1987-10-01), Amazawa et al.
patent: 4873702 (1989-10-01), Chiu
patent: 4910753 (1990-03-01), Wakatsuki et al.

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