Description
The MT9123 Voice Echo Canceller implements a cost effective solution for telephony voice-band echo
cancellation conforming to ITU-T G.165 requirements. The MT9123 architecture contains two echo cancellers which can be configured to provide dual channel 64 millisecond echo cancellation or single channel 128 millisecond echo cancellation.

FEATUREs
• Dual channel 64ms or single channel 128ms echo cancellation
• Conforms to ITU-T G.165 requirements
• Narrow-band signal detection
• Programmable double-talk detection threshold
• Non-linear processor with adaptive suppression threshold and comfort noise insertion
• Offset nulling of all PCM channels
• Controllerless mode or Controller mode with serial interface
• ST-BUS or variable-rate SSI PCM interfaces
• Selectableµ/A-Law ITU-T G.711; µ/A-Law Sign Mag; linear 2’s complement
• Per channel selectable 12 dB attenuator
• Transparent data transfer and mute option
• 19.2 MHz master clock operation

APPLICATIONs
• Wireless Telephony
• Trunk echo cancellers