Piecewise recursive vertical filter for PIP feature

Details Piecewise recursive vertical filter for PIP feature Piecewise recursive vertical filter for PIP feature

1986-06-05

1987-05-12

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358138, 358260, 358181, H04N 5272, H04N 712

Patent

active

046654399

ABSTRACT:
Only every third line is utilized for the picture-in-picture feature. Each third line is a function of weighted contributions from the present line and the two previous lines. The third lines are weighted by a factor 1-2a, while the remaining two lines will each be weighted by a factor a. The circuit for implementing this equation consists of a first and second multiplier multiplying each of the incoming filter signals by a and 1-2a, respectively. Throughout the middle line, the (1-2a) multiplied input is applied to one input of a summing circuit, while for the remaining lines the same summing circuit input is applied to the terminal furnishing the input signal multiplied by a. The second summing input receives a "0" during the lines following the valid line, and the output of a delay unit during the remaining two lines. The input to the delay unit is connected to the summing circuit output. The desired output signals, properly weighted, are available every third line at the summing circuit output.

REFERENCES:
patent: 4155093 (1979-05-01), Lux
patent: 4249212 (1981-02-01), Ito
patent: 4551753 (1985-11-01), Nishizawa
patent: 4563703 (1986-01-01), Taylor

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