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New low power TWELP vocoder delivers crystal clear voice performance
August 07, 2012 // Paul Buckley
CML Microcircuits has expanded the company’s DuraTALK digital voice processor range with the release of a new professional radio low bit-rate 2.4 kbps vocoder.
The CMX7262 is a high-performance low bit-rate vocoder for professional two-way radio, providing market-leading 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 CMX7262 TWELP vocoder provides a highly-integrated solution with optimised signal processing ensuring lowest power consumption. Voice is handled 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 analogue voice out.
The device operates from a 3.0 V to 3.6 V supply and is built on CML’s FirmASIC technology providing maximum flexibility and optimal performance, in a single small 64-pin VQFN and LQFP packages.
Visit CML at www.cmlmicro.com
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The development platform for i.MX 6Quad from element14 (built to the Freescale SABRE Lite design) is an evaluation platform featuring the powerful i.MX 6Q, a multimedia application processor with Quad ARM Cortex-A9 cores at 1.2 GHz from Freescale Semiconductor.
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