This is a user's manual for OKI Noise/Echo Canceller, MSM7731-01. The evaluation board is designed for your 'turn-key' evaluation of MSM7731-01 with the following features; l On-board Micro Controller Interface Circuit Easy to set the internal control register without an external micro controller. l On-board Speaker Amplifier and Microphone Input Circuit Realizes direct connection to a speaker and a microphone. l Single 12V power supply For easy connection to a cigarette AC adopter of a car For the specifications and the functions of MSM7731-01, please refer to the device datasheet.