Magni Systems, Inc.

Daniel L Schuster

A color enhancement circuit according to the present invention extracts 'sine-squared' (haversine) pulses representing absolute values for the derivatives of R-Y and B-Y color difference 'sine-squared' transitions; multiples by offset, sign-inverted luminance, and adds the luminance-weighted 'singe-squared' pulses to the composite video as color enhancement signals which exceed the NTSC-legal chroma bandwidth but are within the NTSC-legal luminance bandwidth. The pulses augment luminance during chroma transitions, restoring luminance contributions from chrominance which are lost when chroma subcarrier packet risetimes and bandwidth are limited by NTSC broadcast requirements.

Graphics encoder video enhancement

A linear switch with high off-state isolation in provided for use in video waveform monitors and/or graphic encoders and mixers. The linear switch provides a proportional mix of two signal sources in response to a control voltage for fading and keying from one source to another in order to allow complete elimination of either source from the output (high isolation when a source is fully off) which can be achieved with minimal circuitry.

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Portland, OR, United States of America

Daniel L Schuster