DPCM coder and associated decoder

Abstract

Abstract This device comprises an input for receiving the signal to be coded, a difference circuit (12) for supplying a difference signal formed by a certain number of binary elements representing the difference between the signal to be coded and a prediction signal, a transmission-prediction circuit (10) for supplying this prediction signal, a transmission-transcoding circuit (15) for reducing the number of binary elements of the difference circuit as a function of a control datum, an activity-metering circuit (30) for supplying an activity datum, a statistical coding circuit (22) with variable-length digital words for coding the output signal from the transcoding circuit, a buffer memory circuit (25) for accumulating the words of the statistical coding circuit and for supplying them to the output of the said device and an in-use metering circuit (45) for supplying an in-use datum for the buffer memory circuit. This device further comprises a combining unit (50) for supplying the control datum from the activity datum and from the in-use datum. <??>Application: digital television. <IMAGE>

Inventors

• 👤 Jean-Yves Société Civile S.P.I.D. Boisson

Bibliographic Details