Motorola Corporation

Freescale Semiconductor,inc.

Patrick Douziech

John Avis Shepherd

An apparatus and method for tuning a filter ( ) with oscillator alignment for applications where the filter tuning signal ( ) is generated independently of the local oscillator tuning signal and the tuning range is large, for example such as terrestrial and cable TV broadcasting (40 to 860 MHz). The filter being adapted to a filter tuning modulation signal ( ) having a first frequency (F ) and a second frequency (F ). Values of the output signal ( ) are measured, a first value (S ) at the first frequency, and a second value (S ) at the second frequency, and a comparison signal ( ) is generated in comparing the first value and the second value to adjust filter with the tuning control signal in response to the comparison signal, modulation signal and an approximate filter tuning signal to provide a desired signal at the output signal.

Apparatus and method for tuning a filter

A television vertical timebase circuit includes an arrangement (10, 25, 30, 35, 40, 45) for generating a vertical ramp voltage of first and second slopes corresponding to 4:3 and 16:9 aspect ratios. An arrangement (50,55,65) adds a predetermined voltage to a predetermined portion of the 16:9 ratio ramp voltage such that unwanted visible signals are positioned outside the visible screen area when displaying 16:9 aspect ratio pictures.

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Cessy, France

Patrick Douziech