Automatic drift control circuit

Details Automatic drift control circuit Automatic drift control circuit

1987-06-29

1989-08-22

Miska, Vit W.

Coded data generation or conversion

Converter compensation

341139, 375 17, H03K 1302, H03M 106

Patent

active

048600105

ABSTRACT:
A received multi-level signal is demodulated and when drift of the received signal is comparatively small, an error signal is selected, integrated and added to the received signal to correct the drift. The error signal is indicative of a condition of an anglog-to-digital conversion or decision level of the received signal. The condition of the decision level is monitored and when, on the basis of the monitored decision level it is detected that drift of the received signal is large, the error signal is selected corresponding to a specified range and includes bit signals of higher order than a most significant bit and of lower order than a least significant bit of the converted digital signal. The selected error signal is then integrated and added to the demodulated received multi-level signal. A pseudo pulling condition in feedback control is thereby prevented.

REFERENCES:
patent: 3475748 (1969-10-01), Price
patent: 4186384 (1980-01-01), Acker
patent: 4335402 (1982-10-01), Kromer, III et al.
patent: 4377759 (1983-03-01), Ohhata
patent: 4590458 (1982-05-01), Evans et al.
patent: 4602374 (1986-07-01), Nakamura et al.

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