Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-10-02
1989-05-02
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358166, H04N 5262
Patent
active
048273430
ABSTRACT:
In the PIP circuit of a television receiver, the resolution of the analog-to-digital converter is improved by one bit. This is done by adding a dither signal, having an amplitude equal to one-half the least significant bit at the converter output to the analog input signal throughout specific lines of the input signal. If the converter output signal is filtered by a piecewise recursive filter, in which every third line is a valid line, the other two being discarded in the subsequent PIP processor, then the dither signal is applied during the valid line and the line two lines removed from the valid line, i.e. the line following the previous valid line. If the filter is a FIR filter then the dither signal is applied during alternate lines.
REFERENCES:
patent: 4095259 (1978-06-01), Sawagata
patent: 4352123 (1982-09-01), Flamm
patent: 4550309 (1985-10-01), Hiller et al.
patent: 4665438 (1987-05-01), Miron et al.
patent: 4665439 (1987-05-01), Naimpally
patent: 4684983 (1987-08-01), Acampora et al.
patent: 4710747 (1987-12-01), Holland
Goodman Edward W.
North American Philips Consumer Elec. Corp.
Peng John K.
Shepperd John W.
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