Innovision Corporation

Gary Bryan Wordsworth

Timothy John Borer

David Christopher Clarkson

David Christopher Kneller

Stephen Sherlock

David Llyod Schnuelle

A high speed analog-to-digital converter utilizes a fine resolution ADC to digitize the low band component of an analog video signal to produce a fine resolution signal and a coarse resolution ADC to digitize the full spectrum of the analog signal and produce a coarse resolution signal. The coarse resolution signal is subtracted from the fine resolution signal to generate a summed signal containing a quantization error, which is filtered through a low pass digital filter to filter out the high band component and pass the quantization error. The filter output is summed with the coarse resolution signal to restore the fine resolution of the low band, producing a digital output signal that has a resolution suitable for high definition applications.

Summation of band-limited ADC outputs having different resolutions and rates

An apparatus for use in a method for scanning an image on a film and generating a video signal therefrom. The apparatus having a signal processor (10) receiving a plurality of input raster lines representing a film image, and a control unit (11) having controls (14) operating on said signal processor, whereby the number of the input raster lines used by the signal processor in the active raster to generate said output signal is variable. A signal representing a sequentially scanned image is supplied to filter (12) which performs an anti-aliasing and a decimation process. The amount of oversampling can be varied depending on various factors, such as film speed, and degree of anti-aliasing and aperture correction so as to optimize performance and, in CRT-based systems so as to maintain the size of the raster on the face of the CRT above a predetermined minimum.

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S. Bucks, United Kingdom

Gary Bryan Wordsworth