Multistandard audio processor

16 April 2008 Analogue, Mixed Signal, LSI

New from STMicroelectronics is an audio processor based on an ARM7TDMI core coupled with ST’s proprietary FFX (full flexible amplification) digital modulation technology. The STA331, with integrated Class D Codec, offers a level of flexibility that enables it to be used across the full range of consumer audio products, from portable and wireless devices to home theatre and audio systems.

The STA331’s analog and digital audio peripherals make it a flexible solution for mid-range sound-processing applications, where product differentiation is critical. The code runs from the embedded RAM, uploaded from external serial Flash memory, and the whole set of audio parameters and functions can be controlled via an I²C interface, or through a customisable GPIO interface for standalone operation. Moreover, the widely used ARM7TDMI core allows fast porting of the third-party audio effects that are available for ARM processors.

The IC embeds a stereo ADC, the FFX PWM modulator and a powerful bridge, in a single package, along with multistandard digital connectivity and a three-way input selector. Full multiplexing of multiple audio sources is possible.

A complete library of algorithms has been developed to improve the listening experience of both musical and video content. The library includes digital audio processing, such as ST’s proprietary Tones Control, WideSurround, StereoEnhancer, intelligent volume control (MDCR), enhanced listening modes (voice and midnight modes), noise reduction and echo cancellation, and loudspeaker and cabinet compensation EQ. Compressed audio algorithm decoders, in addition to common third-party algorithms, are available upon request.

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