Voice Switched Speakerphone

UTC34018 VOICE SWITCHED SPEAKERPHONE CIRCUIT DESCRIPTION LI NEAR I NTEGRATED CI RCUIT. The UTC34018 speakerphone integrated circuit incorporates the necessary amplifier, attenuators, and control functions to produce a high quality hands-free speakerphone system. Included are a microphone amplifier, a power audio amplifier for the speaker, transmit and receive attenuators, a monitoring system for background sound level, and an attenuation control system which responds to the relative transmit and receive levels as well as the background level. Also included are all necess.

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