Automatic d-c offset cancellation in PCM encoders

Details Automatic d-c offset cancellation in PCM encoders Automatic d-c offset cancellation in PCM encoders

1977-07-15

1979-02-20

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

340347CC, 328151, 307353, 328162, 179 15BL, H03K 1716, H03K 1766

Patent

active

041409256

ABSTRACT:
During encoding of voice frequency (VF) signal in a PCM channel bank the encoder encounters direct current (d-c) offset component resulting from the particular VF signal. Such d-c offsets cause errors above and beyond the normal errors inherent in the normal encoding process. The present invention alleviates this problem by providing an automatic d-c offset cancellation circuit which closely follows the d-c offset component and provides a d-c component of opposite sign to cancel it.

REFERENCES:
patent: 3103629 (1963-09-01), Damen et al.
patent: 3207986 (1965-09-01), Bailey
patent: 3654560 (1972-04-01), Cath et al.
patent: 3816825 (1974-06-01), Kaneko et al.
patent: 3819864 (1974-06-01), Carroll et al.

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