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

Features
● Single-chip full-duplex hands-free operation
● Automatic gain control
● Optional 34 dB microphone preamplifier
● Integrated mute and volume control
● Integrated 80 dB IDR dual codec
● Speech-trained Network and Acoustic Echo Cancellers
● Powerdown mode
● Microcontroller Interface