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Digital Voice Processor


  • Simple Radio Audio Path Connectivity
  • Real-time Digital Voice Encryption
  • Voice Store/Retrieve, Packet data
  • Air Interface Protocol
  • Instant Voice Capture
  • Flexible 256 User Addressing
  • Embedded RALCWI Vocoder
    Licence Included (Royalty Free)
  • Embedded Audio-band Modem
  • Small 48-pin LQFP/VQFN


  • Digital Voice Encryption on Analogue Radio
  • Wireless Door Entry/Gate Access
  • Analogue Radio Add-on
  • Digital Advantage for Analogue Radio

Supply Requirement:

  • 1.8 V and 3.3 V

The CMX7011 is a flexible, half-duplex, digital voice encryption processor that provides the digital advantage to conventional analogue two-way radios.

Digital voice scrambling is a key feature of the device, transmitting and receiving secure encrypted voice via an embedded robust data modem.

The device allows simple implementation and configuration within existing designs and is intended to be added to a radio via an accessory module or "feature socket". The device is simple to control via a small, low-power microcontroller.

The CMX7011 offers good quality speech which is better than that of traditional analogue radios at the fringes of reception and, using the internal digital encryption algorithm, significantly higher levels of security are achieved.

Embedded within the CMX7011 is CML's proven and reliable RALCWI (Robust Advanced Low Complexity Waveform Interpolation) vocoder providing near toll quality speech at a low bit rate.

A significant feature of the CMX7011 is the programmable push-to-talk (PTT) buffer which offers instant voice capture in transmit mode.

The PTT buffer temporarily stores the initial part of the speech and can eliminate voice clipping caused by the time required to decode sub audio signals like CTCSS in the receiver, as well as to compensate for system delays caused by repeaters.

Within the CMX7011's header frame is a user-programmable 8-bit address field which allows up to 256 individual user addresses to be defined.

The device also offers a number of additional advanced features including Voice Storage and Retrieval, Secure Packet Data capability and Late/Re-entry protocol providing high performance in fading conditions.

The CMX7011 uses CML's proprietary FirmASIC component technology, providing maximum flexibility with upgrade capability and a roadmap of future function enhancements.

The CMX188 is a 'plug and play' (no Function Image upload required) version of the CMX7011. The CMX188 is pin and function compatible with the CMX7011 and is available for high quantity applications. Please contact CML for further details

Block Diagram


Design Support Information



Q. Can I connect the CMX7011 Digital Scrambler directly into a radio's audio path?

A. Yes, that is the intended use of the CMX7011, however there are a number of considerations that need to be taken into account. To achieve optimum performance, radio specific interface circuitry may be required.

When the radio is in digital voice scrambler mode the radio's audio path: 'pre/de-emphasis', 'companding', 'VOX' and any audio band filtering, should be turned off or compensated for with suitable filtering. 

Group delay is another potential problem area that is radio dependant and may require compensation.


Q. How much memory do I need to reserve in my host Flash memory to store the CMX7011 Function Image™.

A.  Realistically we do not expect the CMX7011 Function Image™ to exceed 48kbytes however, the absolute maximum size is 64kbytes.

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