Vocoder for professional two-way radio

28 November 2012 Analogue, Mixed Signal, LSI

CML Microcircuits has expanded its DuraTALK digital voice processor range with the release of a new low bit-rate 2,4 Kbps vocoder.

Targeted at professional two-way radio, the CMX7262 provides crystal clear voice and excellent performance in real-life radio operation. This is achieved through the use of the latest state-of-the-art voice coding technology called ‘Tri-Wave Excited Linear Prediction’ (TWELP), developed by the digital voice coding experts at DSP Innovations.

The chip handles voice in 20 ms frames, ensuring compatibility with recognised digital PMR standards as well as CML Microcircuits’ range of digital PMR baseband processors.Supporting the voice coding function is a robust forward error correction (FEC) scheme, an important feature to mitigate errors inherent when transmitting over narrowband radio channels in challenging conditions.

Background noise reduction has also been implemented to further enhance voice clarity. Unlike other purely digital-based solutions, the CMX7262 integrates a voiceband audio codec (ADC/DAC functionality), input/output amplifier and loudspeaker driver with digital gain control to give a complete solution of analog voice in to vocoded data out and vocoded data in to analog voice out.

The device operates from a 3,0 V to 3,6 V supply and is supplied in small 64-pin VQFN and LQFP packages.

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