Video Delta Modulation Encoder.
Patent, Filed 13 Oct 89, patented 8 Jan 91,
DEPARTMENT OF THE NAVY WASHINGTON DC
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In a continuously variable slope delta modulation encoder or decoder, the slope of a reconstructed signal is varied by selecting the charging voltage across an integrating capacitor. For an NTSC video signal, the charging voltage may be selected by a shift register connected to a voltage divider supplying the integrating capacitor. In an integrating circuit for a multi-slope delta modulation encoder or decoder, the charging voltage across an integrating capacitor is selected to vary the slope of a reconstructed signal which, in an encoder, is compared with the input signal to determine the next bit of the encoded signal. For use with an NTSC video signal, the charging voltage is, preferably, selected by a shift register receiving the encoded signal and retaining the current and immediately previous bits thereof. The shift register receiving the encoded signal and retaining the serve selectively as sources or sinks for a voltage divider through which the integrating capacitor charges to integrate the encoded signal. An object of the present invention is to provide a compact and light weight multi-slope delta modulation encoder requiring low power.
- Electrical and Electronic Equipment