Video signal processing circuit providing noise suppression with

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358 36, H04N 521

Patent

active

048665231

ABSTRACT:
In a video signal processing circuit comprising a complementary filter circuit (3), a subtracting circuit (27) is coupled to an input (1, 5, 33, 29) and to an output (9, 13, 25) of filter (7). The output (9) of the filter (7) is coupled, via a signal path which comprises a noise suppression circuit (43), to a combining circuit (55) which is further coupled to an output (37) of the substracting circuit (27). In order to compensate for the distortion occuring in the signal path via the noise suppression circuit (43) as a result of conversions (13, 49), the distortion in the signal path from the output (9) of the filter (7) to the subtracting circuit is made equal thereto by applying the same conversions (13, 21).

REFERENCES:
patent: 4240103 (1980-12-01), Poetsch
patent: 4393396 (1983-07-01), Raven

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