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Differential PCM coding of video signals with tabulated memories

: Kummerow, T.

Goser, K.:
Mikroelektronik für die Informationstechnik - Vermittlung, Übertragung und Verarbeitung : Vorträge d. NTG-Fachtagung vom 29.-30.9.1986 in Berlin
Berlin: VDE Verlag, 1986 (NTG-Fachberichte 96)
ISBN: 3-8007-1494-9
Nachrichtentechnische Gesellschaft (Fachtagung) <1986, Berlin/West>
Fraunhofer HHI ()
encoding; pulse-code modulation; read-only storage; video signals; tabulated memories; dpcm coders; decoders; prediction accuracy; roms; prom; external registers; tv picture; 1 mbit; 64 kbits

DPCM coders and decoders can be built using tabulated memories and-in the simplest case-external registers. Such system, its variants, reduced prediction accuracy and possible other uses of tabulated memories are discussed. Available or already announced ROMs are suitable for building the codecs. With 5-bit DPCM, a coder needs a mask ROM, 64 k*16, and a decoder needs a 8 k*8 PROM with external registers. Arrangements of tabulated memories in four versions of coders are shown in their relation to the TV picture.