CMX618/638 – RALCWI Vocoder IC’s

Product description

As a members of the CML DuraTALK family of digital voice products, the CMX618/CMX638 are flexible, high integration, high performance, RALCWI Vocoder, offering near toll-quality voice at very low bit rates.

• CMX618: Half-duplex RALCWI Vocoder with Integrated Voice Codec
• CMX638: Full-duplex RALCWI Vocoder with Integrated Voice Codec

A Forward Error Correction (FEC) engine provides optimum performance in real life applications.

The RALCWI Vocoder comprises four independent functions which are selectable by the host: Voice Encoder, FEC Encoder, Voice Decoder and FEC Decoder.

The CMX618 includes an integrated voice CODEC, offering a complete analogue voice to low bit rate vocoded data function, with integrated channel filters, which removes the need for external components.

Both devices operate from a dual power supply (1.8V and 3.3V) and are available in both 48-pin LQFP (L4) and 48-pin VQFN (Q3) packages.

Function Add-ins
New features or enhancements to aid Vocoder operation are available. Function Add-ins currently available:

• Voice Store and Retrieve (VSR)
• Noise Gate
• Encryption
• Fine Analogue Output Gain Option

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Devices are available through our distributors below:

Features

• RALCWI™ CML’s Digital Voice Technology
• Near Toll Quality RALCWI™ Coding Algorithm
• No royalty/license fee
• Multiple Bit-Rate Modes
  – 2400 or 2750 bps
  – 3600 bps with FEC Enabled
• 4-bit Viterbi Soft Decision Decoding
• Integrated Voice Codec(CMX618 and CMX638 only)
• Integrated Input and Output Channel Filters
• 20ms, 40ms, 60ms and 80ms Packet Lengths
• No Licensing or Royalty Payments
• Ancillary Audio Functions:
  – Voice Activity Detector
  – Comfort Noise Generator
  – DTMF and Single Tone Regeneration
• Voice Store and Retrieve, Encryption and Noise Gate. Fine Analogue Output Gain. Function Add-ins Available
• Voice Activity Detector, DTMF/Tone generator, comfort noise generator, soft decision decoding

Design resources