A G711/G722 Front End Circuit for High Quality Handsfree Telephony
1994
This paper presents the architecture and implementation of an analog-to-digital front end circuit developed for an enhanced quality handsfree telephone terminal, including digital acoustic echo cancellation. This circuit has been implemented in a 1 ?m analog CMOS process and the design has been optimized using efficient analog and digital silicon generators. As a result, the SNR of each chain is better than 87 dB and the circuit has a total power dissipation of less than 80 mW. Measured results are also presented.
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