Communications system with modulation mode of received signal automatically controlling modulation mode of associated transmitter

Abstract

Abstract COMMUNICATIONS SYSTEM INVOLVING PLURAL RECEIVE/TRANSMIT STATIONS, AT LEAST SOME OF WHICH ARE EQUIPPED TO RECEIVE AND TRANSMIT SIGNALS IN VARIOUS SIGNAL MODULATION MODES, WITH AT LEAST ONE STATION COMPRISING RECEIVER MEANS AUTOMATICALLY SENSING THE MODULATION MODE OF A GIVEN RECEIVER TRANSMISSION AND RESPONSIVELY ESTABLISHING AND MAINTAINING THE OPERATING MODE OF THE ASSOCIATED TRANSMITTER TO TRANSMIT IN THE MODULATION MODE SENSED BY THE RECEIVER. THE RECEIVER IS ALSO PROVIDED WITH MEMORY CIRCUITRY TO MAINTAIN THE OPERATING MODE OF THE TRANSMITTR IN THE MODULATION MODE LAST SENSED BY THE RECEIVER UNTIL AN EFFECTIVE SIGNAL HAVING ANOTHER MODULATION MODE IS RECEIVED. SQUELCH CIRCUTRY IS ALSO PROVIDED TO DISABLE THE RECIVER OUTPUT IN THE SITUATION WHERE THE SIGNAL-TO-NOISE RATIO OF THE RECEIVED SIGNAL IS BELOW A PREDETERMINED VALUE. VARIOUS TYPES OF TYPICAL RECEIVE/TRANSMIT SYSTEMS ARE PRESENTED, INVOLVING DIFFERENTIATION AS BETWEEN AMLITUDE MODULATION TYPE AND SINGLE SIDEBAND MODULATION TYPE RECEIVED SIGNALS, BETWEEN HIGH STABILITY AMPILTUDE MODULATION AND HIGH STABILITY SINGLE SIDEBAN MODULATION RECEIVED SIGNALS, BETWEEN AMPLITUDE MODULATION, UPPER SINGLE SIDEBAN, AND LOWER SINGLE SIDEBAND TYPES OF RECEIVED SIGNALS, BETWEEN AMPLITUDE MODULATION AND FREQUENCY MODULATION TYPES OF RECEIVED SIGNALS, AND BETWEEN SIGNAL SIDEBAND AND FREQUENCY MODULATION SYPES OF RECEIVED SIGNALS.

Inventors

• 👤 Leonard R Kahn

Bibliographic Details