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Machine translation
1. (WO1980001630) PHASE-LOCKED LOOP FOR PCM TRANSMISSION SYSTEMS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001630    International Application No.:    PCT/US1980/000049
Publication Date: 07.08.1980 International Filing Date: 21.01.1980
IPC:
H03L 7/085 (2006.01), H04L 7/027 (2006.01)
Applicants:
Inventors:
Priority Data:
8556 02.02.1979 US
Title (EN) PHASE-LOCKED LOOP FOR PCM TRANSMISSION SYSTEMS
(FR) BOUCLE A PHASE BLOQUEE POUR SYSTEMES DE TRANSMISSION PCM
Abstract: front page image
(EN)A phase-locked loop for PCM transmission systems has a phase comparator (20) which provides continuous regulation of the loop oscillator (30). When a PCM pulse signal is present, the phase comparator selectively compares the PCM and oscillator clock signal and generates an error signal which synchronizes the oscillator to the PCM frequency. During the absence of a PCM pulse, the phase comparator provides a high impedance output and oscillator synchronization is maintained by a loop filter (23). In the disclosed embodiment, the phase comparator is a dual section tristate gate.
(FR)Une boucle a phase bloquee pour des systemes de transmission PCM (a modulation par impulsions codees) possede un comparateur de phases (20) qui effectue le reglage continu de l"oscillateur de boucle (30). Lorsqu"un signal d"impulsion PCM est present, le comparateur de phases compare selectivement le signal PCM et le signal d"horloge de l"oscillateur et produit un signal d"erreur qui synchronise l"oscillateur sur la frequence PCM. Dans l"absence d"une impulsion PCM, le comparateur de phase produit une sortie d"impedance elevee et la synchronisation de l"oscillateur est maintenue par un filtre de boucle (23). Dans le mode de realisation decrit, le comparateur de phases est une porte a trois etats a double section.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)