Digital coder for analogue signals - inverts rearranged digital samples using memory and transforms for transmission

The digital coder, for analogue signals, divides the signals into consecutive groups, inverts these groups and/or rearranges them amongst themselves. The groups are delineated by the points in time when the signal assumes a given value or when the signal and the sign of its first derivative have giv...

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Bibliographic Details
Main Author CHRISTIAN MAGNIEN ET FERNAND SECHER
Format Patent
LanguageEnglish
French
Published 10.02.1978
Subjects
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
JAMMING OF COMMUNICATION
SECRET COMMUNICATION
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Summary:The digital coder, for analogue signals, divides the signals into consecutive groups, inverts these groups and/or rearranges them amongst themselves. The groups are delineated by the points in time when the signal assumes a given value or when the signal and the sign of its first derivative have given values. The analogue signal is converted into digital samples. The samples are inverted and/or permutated using a digital memory. The memory is read and the samples transformed into signals for transmission. The reverse process takes place at the receiver. L'invention concerne le codage analogique tel qu'un signal de parole pour en assurer la discrétion. Elle a pour objet des codages consistant à partager le signal analogique en séquences se succédant dans le temps, à inverser ces dernières sur elles-mêmes par rapport au temps, et/ou les permuter entre elles grâce à un traitement numérique. Elle a également pour objet des procédés et dispositifs pour la mise en oeuvre de ces codages. Elle s'applique avantageusement au codage d'un signal téléphonique.
Bibliography:Application Number: FR19760021623