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CMX883E1

Baseband Processor for ‘Leisure Radios’

CML Microsystems Plc 

FRS Signalling Processor

CMX883

DCS

The DCS code is in NRZ format and is transmitted at 134.4b/s in either 23 or 24 bit patterns. The code,

for transmission or reception is programmed via the host µC with the ‘turn off’ tone being supplied from

the CTCSS facility. Decoding is carried out rapidly thus avoiding the loss of the beginning of speech or

data signals.

Signal Monitor

An auxiliary circuit intended for the monitoring of any signal or level; both internal and external. This

function can be used in conjunction with the host µC to allow such activities as: VOX operation and/or the

‘wake-up’ of powered-down circuitry.

Audio Processing:

Adjustable Gain Input Amplifiers

Selectable, component adjustable inputs are available for microphone or line voiceband or discriminator

inputs. In either mode (Tx or Rx) the selected input can be further level adjusted under the control of the

host µC prior to signal or audio- processing.

Voiceband and Sub-Audio Filtering with Limiting

Both Rx and Tx paths present voiceband filtering; the Tx path filter can be configured to either 12.5 or 25

kHz channel spacing whilst the Rx path also includes a sub-audio passband filter.

Voiceband Pre-emphasis and De-emphasis

Voiceband pre-emphasis is selectable to either 12.5 or 25 kHz channel configurations in the Tx path; de-

emphasis at –6dB/ octave is selectable in the Rx path.

Software Adjustable Gains, Volume, Mixing and Routing

Providing total flexibility of operation, this product, under µC control has the ability to select and route

functions and audio and signal paths, set bandwidths and threshold levels, mix audio and sub bands and

vary both input and out gain/attenuation levels. Output levels from all analogue ports can be ‘ramped’ up

and down at independently programmed rates.

Attenuation-Adjustable Single/Two-Point Modulation Outputs

To facilitate a wide range of transmitter types, the CMX883 has the ability to provide, independently

programmable, modulation outputs; for single or two-point modulation schemes.

Scrambler

An optional frequency inversion scrambler is provided in both transmit and receive modes.

 2004 CML Microsystems Plc

4

D/883/7

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