U4050B

·Integrated amplifier for loudhearing operation
·Anticlipping for loudspeaker amplifier
·Supply voltages for all functional blocks of a subscriber set
·Adjustable DC characteristics
·Adjustable sending and receiving amplificatio
·Automatic line loss compensation
·Symmetrical output of earpiece amplifier
·Built-in ear protection
·Symmetrical input of microphone amplifier
·Adjustable sidetone suppression  independent of sending and receiving amplification
·DTMF and MUTE inputs
·Anticlipping in transmit direction
·Squelch
·Integrated transistor for short circuiting the line  voltage
·Power down
·Operation possible at line currents above 10 mA

The electronic speech circuit U4050B is a linear integrated circuit for use in telephone sets. It replaces the hybrid transformer, sidetone equivalent and ear protection rectifiers.
TheU4050B is line powered and contains all componentsnecessary for amplification of signals and adaptation to the line. An integrated loudspeaker amplifier allows loudhearing operation.