TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR INTERFACE
PRESENTS THE PROPER DC PATH FOR THE LINE CURRENT HANDLES THE VOICE SIGNAL,
PERFORMING THE 2/4 WIRES INTERFACE AND CHANGING THE GAIN ON BOTH SENDING AND
RECEIVING AMPLIFIERS TO COMPENSATE FOR LINE ATTENUATION BY SENSING THELINE
LENGTHTHROUGH THE LINE CURRENT ACTS AS LINEAR INTERFACE FOR MF,
SUPPLYING A STABILIZEDTO THE DIGITAL CHIP AND DELIVERING TO THE LINE
THE MF TONE GENERATED BY THE DIALER
DESCRIPTION The is a monolithic integrated circuit in 16lead dual in-line
and SO20 plastic packages to replacethe hybridcircuit in telephoneset.It workswith
the same type of transdurcers for both transmitter and receiver (typically piezoceramic
capsules, but PIN CONNECTIONS (top view)
















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