Pulscodemodulationssystem

Système de modulation par impulsions codées

Pulse code modulation system

Abstract

1. Pulse code modulation system, in which from an analog video signal is produced a digital signal with code words with which are associated amplitude values of the analog video signal and in which the digital signal is passed across a recording or transmission channel and is then converted back into an analog video signal, characterized in that the association of the different words of the digital signal to the different amplitude values takes place in such a way that starting from the limits of the amplitude range provided for the analog video signal, code words are formed in which n bits are changed for one limit of the amplitude range compared with the code word and for the amplitude stages following on one limit all code words with n = 1 form a first group, to which is connected a second group of code words with n = 2 and further groups with in each case one more n rising up to a group. of n = (number of bits of a code word minus 1), and a code word in which all bits are changed, corresponding to the other limit of the amplitude range.
Bei einem PCM-System erfolgt die Zuordnung der verschiedenen Worte des Digitalsignals zu den verschiedenen Amplitudenstufen des Analogsignals derart, daß die durch die Änderung eines Bits eines Wortes bedingten Änderungen des Amplitudenwertes integriert über alle möglichen Bitänderungen eine möglichst geringe Störwirkung zur Folge haben.

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Patent Citations (3)

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    DE-2426769-A1December 11, 1975Deutsche Forsch Luft RaumfahrtVerfahren zur uebertragung digitaler signale mit fehlersicherung
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    DE-3113397-A1October 21, 1982Bosch Gmbh RobertPulscodemodulationssystem

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Cited By (6)

    Publication numberPublication dateAssigneeTitle
    EP-0300771-A1January 25, 1989BRITISH TELECOMMUNICATIONS public limited companyPCM-Signalkodierung
    US-4729043-AMarch 01, 1988American Telephone And Telegraph Company, At&T Bell LaboratoriesDigital information storage and retrieval using video signals
    US-5062152-AOctober 29, 1991British Telecommunications Public Limited CompanyPcm signal coding
    WO-8503177-A1July 18, 1985Robert Bosch GmbhDifferential coded pulse modulation system
    WO-8703732-A1June 18, 1987American Telephone & Telegraph CompanyDigital information storage and retrieval using video signals
    WO-8900790-A1January 26, 1989British Telecommunications Public Limited CompanyCodage de signaux mic (modulation par impulsions codees)