CML Microcircuits Launches Duplex Vocoder IC

(Product News, 21 Apr 2008)

CML Microcircuits has launched CMX638, a new RALCWI (Robust Advanced Low Complexity Waveform Interpolation) IC to its vocoder family. The CMX638, is a flexible, highly integrated, high performance full-duplex vocoder utilising RALCWI technology.

CML now offers the CMX608, CMX618 and CMX638 high performance vocoders, which all offer near toll-quality voice performance at very low bit-rates.

A Forward Error Correction (FEC) engine provides optimum performance in real-life applications, with the RALCWI vocoder being comprised of four independent functions, which are selectable by the host: Voice Encoder, FEC Encoder, Voice Decoder, FEC Decoder.

The CMX608 and CMX618 are half-duplex ICs, with the new CMX638 offering full-duplex capability. The CMX618 and CMX638 include an integrated voice CODEC, for complete analog voice to low bit-rate vocoded data function (with integrated channel filters, removing the need for external components).

For optimum voice performance the following functions are included:
- Soft Decision Decoding (SDD)
- Discontinuous Transmission Detection (DTX)
- Voice Activity Detection (VAD)
- Comfort Noise Generation (CNG)
- Single (STD) and Dual (DTMF) Tones (can be detected, sent separately in the coded bit-stream, then regenerated at the far-end)

Vocoder applications include: voice storage and playback devices, VoIP, voice pagers, digital WLL, digital PMR/LMR, voice radio, digital trunking, regenerative digital voice repeaters, digital voice scrambling and encryption and much more.

All three products operate from dual power supply (1.8V and 3.3V), and are available in both 48-pin LQFP (L4) and 48-pin VQFN (Q3) packages.

Click here for more information on CML Microcircuits' RALCWI vocoder ICs

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