Transmitting two television signals through one channel

Details Transmitting two television signals through one channel Transmitting two television signals through one channel

1981-09-24

1984-08-21

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, 358135, 358 12, H04N 708

Patent

active

044673566

ABSTRACT:
Two input pictures are each compressed horizontally, one to three-quarters width, the other to one-quarter width, and combined side-by-side to form a single picture suitable for transmission over a standard link. The two signals are interchanged on alternate fields. Bandwidth limiting in the transmission link results in the signal compressed to one-quarter width having a final bandwidth one-third that of the other signal. This applies to each picture on alternate fields. A one-field delay repeats the high-frequencies from the field having wider bandwidth on the subsequent field, so that fine detail will be present on both fields. Lower bandwidth information is separately transmitted every field preserving vertical detail and the reproduction of motion at field rate. At the receiving end, the pictures are separated and expanded to normal width.

REFERENCES:
patent: 2975234 (1961-03-01), Blan
patent: 4004084 (1977-01-01), Brown
patent: 4027333 (1977-05-01), Kaiser
patent: 4210927 (1980-07-01), Yumde
patent: 4215370 (1980-07-01), Kirk

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