Circuitry for approximating the control signal for a BTSC spectr

Details Circuitry for approximating the control signal for a BTSC spectr Circuitry for approximating the control signal for a BTSC spectr

1987-05-11

1989-04-18

Harkcom, Gary V.

Boots, shoes, and leggings

36471501, G06F 738

Patent

active

048232980

ABSTRACT:
Apparatus for approximating a signal k(b) useful in controlling a Broadcast Television Systems Committee (BTSC) expander circuit where k(b)=R(b+1)/(b+51) and b is the root-mean-square (RMS) value of an applied signal. In order to generate the control signal k(b), the signal, b, is scaled by a first coefficient. The signal, b, is squared and scaled by a second coefficient. The scaled signal and the squared and scaled signal are combined with a constant value to produce a signal approximating the signal k(b).

REFERENCES:
patent: 3564222 (1971-02-01), Hackensack et al.
patent: 3789203 (1974-01-01), Catherall et al.
patent: 3962573 (1976-06-01), Staley
patent: 4513388 (1985-04-01), Veendrick et al.
patent: 4760542 (1988-07-01), Mehrgardt et al.

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