Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-06-05
1988-10-25
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358136, H04N 713
Patent
active
047807601
ABSTRACT:
A digital television transmitter has a buffer that receives a low resolution low pass filtered signal. A high resolution high pass filtered signal is applied to the buffer only when the buffer can accept it without overflowing in accordance with a threshold signal. A controller provides a control signal that varies in accordance with an interframe difference motion indicator signal and the inverse of the occupancy of the buffer. A digital television receiver receives a digital television picture signal and preferably a transmitter buffer occupancy state signal. A low resolution low pass filtered signal is applied to an adder. A high resolution high pass filtered signal is applied to the adder in accordance with the buffer state and motion indication. The transmitter and receiver are useful in video teleconferencing.
REFERENCES:
patent: 4217609 (1980-08-01), Hatori et al.
patent: 4562468 (1985-12-01), Koga
patent: 4692801 (1987-09-01), Ninomiya et al.
Ng Sheau-Bao
Waldman Harvey
Davis Jr. James C.
General Electric Company
Groody James J.
Kostak Victor R.
Steckler Henry I.
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