SL34118 Datasheet (System Logic Semiconductor) - Voice Switched Speakerphone Circuit

SL34118, Voice Switched Speakerphone Circuit

INTRODUCTION The fundamental difference between the operation of a speakerphone and a handset is that of halfduplex versus full-duplex.

The handset is full duplex since conversation can occur in both directions (transmit and receive) simultaneousiy.

A speakerphone has higher gain levels in both path

SL34118 Voice Switched Speakerphone Circuit The SL34118 Voice Switched Speakerphone Circuit incorporates the necessary amplifiers, attenuators, level detectors, and control algorithm to form the heart of a high quality hands-free speakerphone system.

Included are a microphone amplifier with adjustable gain and MUTE control, Transmit and Receive attenuators which operate in a complementary manner, level detectors at both input and output of both attenuators, and background noise monitors for bot

SL34118 Features

* of a featurephone.

* Improved Attenuator Gain Range: 52 dB Between Transmit and Receive Low Voltage Operation for Line-Powered Applications (3.0-6.5 V) 4 Point Signal Sensing for Improved Sensitivity Background Noise Monit