Data signal correction circuit

Details Data signal correction circuit Data signal correction circuit

1985-06-17

1987-03-03

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307236, 307359, 307555, 328164, H03K 508

Patent

active

046477900

ABSTRACT:
In a data correction circuit which can, for example, be used as an output circuit of an echo cancelling circuit for a teletext signal, a correction signal with which a level correction circuit and an amplitude correction circuit are controlled is obtained from an output of a sign-determining circuit. By means of a zero-crossing detection circuit the sign-determining circuit is switchable from a three-level sign-changing function in a normal operating mode in which zero-crossings are detected, to a one-level sign-changing function in a mode in which no zero-crossing detection circuit are detected; in that case the amplitude correction circuit is changed-over to a constant amplification.

REFERENCES:
patent: 4333158 (1982-06-01), Voorman
patent: 4377759 (1983-03-01), Ohhata et al.
patent: 4449061 (1984-05-01), Yasuda et al.

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