Frequency inversion audio scrambler supports full duplex operation

June 25, 2019 //By Julien Happich
audio scrambler
Recognising the growing need to protect communication systems from eaves-dropping, CML Microcircuits has introduced a compact user-programmable scrambler IC optimised for inclusion in multi-function audio systems.

Maintaining elevated levels of audio quality, the CMX7158 audio scrambler can rapidly switch between clear and scrambled voice modes via a programmable frequency inversion point, with minimal delay being experienced. Furthermore, its completely independent Tx and Rx signal paths mean that this IC is capable of full duplex operation. Thanks to FirmASIC, a Function Image is generated in which the CMX7158’s functional parameters are defined. This is loaded to the system upon power-up/device initialisation - either from the system’s host microcontroller (across the C-BUS interface) or through an attached serial flash memory. Dual-tone multi-frequency (DTMF) encode/decode, Selcall signalling and VOX detection on both channels are among the other main features encompassed.
Supplied in a space-saving 48-pin VQFN package, it supports low power operation, drawing from a 3.0V-3.6V source, with power conserving modes available. The numerous analogue audio interfaces incorporated make integration into existing system designs very straightforward.
CML Microcircuits –

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