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SL34118 - Voice Switched Speakerphone Circuit

General Description

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.

Key Features

  • of a featurephone.
  • Improved Attenuator Gain Range: 52 dB Between Transmit and Receive Low Voltage Operation for Line-Powered.

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Datasheet Details

Part number SL34118
Manufacturer System Logic Semiconductor
File Size 136.75 KB
Description Voice Switched Speakerphone Circuit
Datasheet download datasheet SL34118 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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 both the transmit and receive channels. A Dial Tone Detector prevents the dial tone from being attenuated by the Receive background noise monitor circuit. Also included are two line driver amplifiers which can be used to form a hybrid network in conjunction with an external coupling transformer.