PCM Detector

Details PCM Detector PCM Detector

1980-02-28

1981-06-23

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

360 29, 360 32, H04N 9493, H04N 708

Patent

active

042754160

ABSTRACT:
A current source supplies current to an integrator representative of a difference between the instantaneous and average values of a video signal having a PCM data component time division multiplexed with an analog luminance component. The integrator is enabled during the central portion of each PCM signaling interval and reset to a reference level during initial and terminal portions of the intervals. Asymmetry of the peak-to-peak PCM signal levels with respect to the average signal level tends to result in asymmetrical excursions of the integrator output voltage relative to the reference level. This asymmetry is corrected by means of a charge source that supplied a predetermined quantity of charge continuously or in discrete packets to the integrator during the central portion of each PCM signaling interval. The integrator voltage excursions are thereby equalized and a substantially uniform probability of detection of the PCM data levels may be realized by means of a threshold device having a threshold level substantially equal to the reference level.

REFERENCES:
Stiltz "Aerospace Telemetry" 1961 pp. 190-191.

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