Low Cost, Low Bit-Rate RALCWI Vocoder IC
Wed, 08/29/2007 - 6:56am
CML Microcircuits announced the RALCWI (Robust Advanced Low Complexity Waveform Interpolation) vocoder IC. The product is the result of a co-operation between CML Microcircuits and SPIRIT DSP. The CMX618 is a flexible, half-duplex, highly integrated RALCWI vocoder IC suited to both wireless and wireline voice applications such as voice scramblers, alarm systems, military field applications and digital professional/leisure two-way radios (DMR/dPMR). RALCWI technology uses proprietary signal decomposition and parameter encoding methods, ensuring high speech quality at high compression rates. The device offers near toll quality voice performance at very low bit rates, with independent MOS scores indicating that the CMX618 generates sound quality comparable with a standard codec running at bit rates above 4,000 bps. The CMX618 includes an integrated voice audio codec, offering a complete analogue voice to low bit rate vocoded data function. There are three programmable vocoding rates: 2,050 bps, 2400 bps or 2,700 bps and when combined with the embedded FEC, the IC provides an overall bit rate of 3600bps.