GENERATEUR MULTIFREQUENCE POUR UN POSTE TELEPHONIQUE

L'INVENTION CONCERNE LA TELEPHONIE. UN GENERATEUR MULTIFREQUENCE DESTINE A ASSURER LA SIGNALISATION MULTIFREQUENCE SYNTHETISE DE FACON NUMERIQUE LES SIGNAUX AUDIOFREQUENCES ET UTILISE UN OSCILLATEUR (600) EN TANT QUE REFERENCE. ON AMELIORE LE TRANSFERT DES SIGNAUX ENTRE UNE LIGNE TELEPHONIQUE ET DES TRANSDUCTEURS D'EMISSION ET DE RECEPTION EN BRANCHANT LES ELEMENTS DE COMMUTATION D'EMISSION ET DE RECEPTION SELON UNE CONFIGURATION QUI PRESENTE UN GAIN, POUR AUGMENTER LE NIVEAU DU SIGNAL.APPLICATION AUX SYSTEMES DE SIGNALISATION TELEPHONIQUE MULTIFREQUENCE. In a multifrequency generator providing tone signaling for a telephone, the common switching functions are performed by solid state switching circuitry (1200). Improved signal transfer between the telephone line and transmit and receive transducer of the telephone is provided by arranging the solid-state transmit and receive switches (1201, 1401) in a gain configuration to increase the level of the speech signal. The tone signals are digitally synthesized and use an integrated R-C oscillator (600) as a reference. Button down and button up debouncing of a contact closure signal from a single contact per button keypad is provided.