General Description

Most modern speakerphones use half-duplex operation, which alternates transmission between the far-end talker and the speakerphone user. This is done to ensure stability because the acoustic coupling between the speaker and microphone is much higher in speaker phones than in handsets where the coupling is mechanically suppressed.

Features


Single-chip,full-duplex,hands-free operation


Optional Tx Noise Guard


Programmable attenuation during double-talk


Optional 34 dB microphone preamplifier


Dual channel AGC’ed volume controls with mute


Dual integrated 80 dB IDR codecs


Speech-trained Network and Acoustic Echo Cancellers


Rx and Tx supplementary echo suppression


Configurable half-duplex training mode


Powerdown mode


Microcontroller Interface