Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-03-19
1991-08-13
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358133, 358174, 358136, H04N 712, H04N 700
Patent
active
050400622
ABSTRACT:
A high definition television system that is characterized by low transmission bandwidth is achieved by removing redundancies in the signal and encoding the remaining signals. In the encoding, a portion of the signals to be transmitted is created in the form of an analog signal or a concatenated plurality of pulse amplitude coded samples (A-signal), and another portion of the signals to be transmitted is created in digital form (D-signal). The D-signal is consigned to a specified portion of the transmitted signal, leaving the remainder of the transmission capacity for the A-signal. When the normally created digital signals do not fully occupy the digital portion, enhanced operation results when selected ones of the analog signals or samples are excised from the A-signal, encoded digitally, and added to the D-signal. The excising of those signals leaves room in A-signal portion to include additional analog signals. This leads to an overall better image reproduction at the receiver. In addition, the samples that are excised are selected from among be the ones whose delection from the A-signal benefits the system most.
REFERENCES:
patent: 4551754 (1985-11-01), Meise et al.
patent: 4748496 (1988-05-01), Drury et al.
Knauer Scott C.
Matthews Kim N.
Netravali Arun N.
Petajan Eric D.
Safranek Robert J.
AT&T Bell Laboratories
Brendzel H. T.
Shepperd John W.
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