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Machine translation
1. (WO1981001934) APPARATUS FOR SYNTHESIZING A MODULATED CARRIER
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/001934    International Application No.:    PCT/US1980/001693
Publication Date: 09.07.1981 International Filing Date: 22.12.1980
IPC:
H04L 27/20 (2006.01)
Applicants:
Inventors:
Priority Data:
106452 26.12.1979 US
Title (EN) APPARATUS FOR SYNTHESIZING A MODULATED CARRIER
(FR) APPAREIL DE SYNTHETISATION D'UNE PORTEUSE MODULEE
Abstract: front page image
(EN)The modulated carrier in a frequency-multiplexed digital communications system is synthesized with each baud of the modulated carrier derived from data stored in a read-only memory (32). The carrier envelope shape is selected to reduce the sidebands of the digitally modulated carrier and thus reduce interchannel interference. The read-only memory digital output (32b) is applied to a digital-to-analog converter (34) for synthesis of an analog voltage, representing the modulated sinusoidal carrier, having reduced higher frequency content, without the necessity for use of a costly, narrow-bandpass filter.
(FR)La porteuse modulee dans un systeme de communication digitale a frequence multiplexee est synthetisee, chaque baud de la porteuse modulee etant derive des donnees stockees dans une memoire morte (32). La forme de l'enveloppe de la porteuse est choisie pour reduire les bandes laterales de la porteuse modulee de maniere digitale et reduire ainsi les interferences entre les canaux. La sortie digitale de la memoire morte (32b) est appliquee a un convertisseur digital/analogique (34) pour effectuer la synthese d'une tension analogique, representant la porteuse sinusoidale modulee, ayant une concentration de haute frequence reduite, sans avoir besoin d'utiliser un filtre a bande passante etroite, couteux.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)