ICs for digital voice communication

25 July 2012 Analogue, Mixed Signal, LSI

CML Microcircuits recently introduced the DuraTALK family of digital voice products, consisting of a wide range of flexible technologies supporting voice-data generation, coding, transcoding, decoding, storage and scrambling functions for digital communication systems.

The CMX608, CMX618 and CMX638 ICs are designed for RALCWI, a CML-owned, low bit rate (2400 bps) vocoder technology that facilitates the transmission and reception of highly compressed voice over inherently noisy narrowband radio channels. RALCWI offers flexible, highly integrated, high-performance vocoders, with near toll-quality voice at very low bit rates.

The CMX8341 digital PMR baseband processor system-in-a-chip is aimed at low-cost, licence-free digital PMR (dPMR) radios conforming to the ETSI standard, TS 102 490, and analog PMR (legacy mode).

Seen as the digital successor to PMR446, digital PMR is now a proven technology targeting highly functional solutions by using low-cost and low-complexity technology. dPMR is a narrowband (6,25 kHz) FDMA technology that is 100% digital and offers many forms of voice and/or data applications. RALCWI in digital PMR will provide savings in cost, size and power consumption.

For CVSD/PCM/ADM, flexible coders and decoders are available for analog-to-digital and digital-to-analog voiceband conversion. The CMX639 and CMX649 address this market segment, providing robust and flexible coding algorithms, low cost, low power and small size, ideal for use in a wide variety of consumer, military and business digital voice applications.

The CMX7261 is a single-chip G.711/G.729A/CVSD full duplex multi-transcoder device, capable of encoding analog voice into linear, µ-law or A-law PCM, CVSD or G.729A data formats. It is capable of decoding PCM, CVSD and G.729A back to analog voice. It can also transcode data between PCM, CVSD and G.729A.

The flexible IC creates toll quality speech for applications such as software-defined radio (SDR), voice-over IP (VoIP), wireless private branch exchange (PBX) and privacy type digital voice communications.

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