System for integrated distribution of switched voice and television on coaxial cable with phase distortion correction

摘要

A system for voice distribution amongst a plurality of telephone subscriber locations operating on a broadband cable network wherein RF transmitting and RF receiving channels for carrying voice and signalling information are established at the subscriber locations and coupled with the broad band network and a central switch is also coupled with the broadband network and enables each RF transmitting channel to be selectively coupled to any of the RF receiving channels. Phase correction pilot tones having a known phase relationship are generated at the telephone subscriber locations and transmitted in one or more phase correction pilot tone channels separate from the RF transmitting channels to the central switch. At the switch, the phase correction pilot tones are recovered and the phases of the pilot tones are used to correct the phases of the transmitting channels.