ADM Voice Codec Lowers Power Consumption, Boosts Voice Quality Voice

The CMX649, an adaptive delta modulation (ADM) voice codec, targets consumer and industrial applications such as cordless telephones, cordless headsets, PC speech-to-text applications, digital voice storage, and telematic voice recognition. The device consumes an operational current of 1.9 mA at 2.7V and includes advanced power-saving options to extend battery life. It offers full-duplex ADM, continuously variable slope delta (CVSD) modulation, and PCM (linear, A law, µ law and linear) operating modes. Operating modes and algorithms are user-configurable to select the best data rate and voice quality for each application. One particular CMX649 CVSD mode provides 64 kb/s coding to support Bluetooth-compatible designs. The CMX649 is available in 20-pin plastic SOIC and TSSOP packages and an evaluation kit, the DE6491 Wireless Voice Link Demonstration Kit, is also available. CML MICROCIRCUITS INC., Winston-Salem, NC. (800) 638-5577.