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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Internet of Things (IoT) manufacturer Ciseco has launched the Raspberry Pi ‘Wireless Inventors Kit’ (RasWIK), featuring 88 pieces to provide everything a Pi owner needs to follow a series of step-by-step projects or to create their own wireless devices, without the need for configuration or even writing code.
RasWIK has been designed to be highly accessible, demystifying the dark art of wireless and enabling anyone with basic computing skills to begin building wireless devices with a Raspberry Pi. You can create anything from a simple traffic light, to a battery monitor, or even a temperature gauge that sends data to the Xively IoT cloud so billions can access the data.This month, Ciseco is giving away twelve Raspberry Pi Wireless Inventors kits, worth £49.99 each for EETimes Europe's readers to win.
And the winners are...
In our previous reader offer, Farsens was giving away five kits for EEtimes Europe readers to evaluate its FenixVortex, Kineo and X1 wireless, battery free sensor tags.
Lucky winners include Mr A. Neil from the UK, Mr. E. Delvaux from Belgium, Mr Lengal from the Czech Republic, Mr H. Bijlsma from the Netherlands, and Mr G. Pfaff from Germany. All should be receiving their packages soon. Lets wish them some interesting findings with their projects.
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