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Audio processors target in-car sound systems

Posted: 23 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:auto processor? automotive system? amplifier?

SigmaDSP audio processor

Analog Devices Inc. has extended its SigmaDSP audio processor family for automotive head units and amplifiers that require signal routing and processing from multiple audio sources.

The ADAU1442, ADAU1445 and ADAU1446 SigmaDSP audio processors incorporate a Flexible Audio Routing Matrix (FARM), which allows automotive audio sub-system engineers to significantly increase the processing speed and reduce the complexity of audio signal routing and clocking issues associated with CD changers, MP3 and DVD players, satellite radios, GPS navigation systems and other asynchronous audio sources. Using the FARM solution, system designers can quickly compensate for the real world limitations of speakers, amplifiers and listening environments, resulting in a dramatic audio quality improvement through speaker equalization, multi-band compression, limiting and third-party-branded algorithms.

The new SigmaDSP audio processors include up to eight stereo asynchronous sample rate converters, an S/PDIF (Sony/Philips Digital Interface) transceiver and serial I/Os that support I?S (inter-IC sound) and TDM (time-division multiplexed) formats. Any of these inputs can be routed to the SigmaDSP core or any of the outputs for maximum system flexibility.

In addition the new SigmaDSP core of the new audio processor family features full 28bit processing (56bit in double precision mode), synchronous parameter loading for ensuring filter stability, and 100 percent code efficiency when used in conjunction with ADI's SigmaStudio graphical development environment, which includes audio processing blocks such as FIR and IIR filters, dynamics processors, mixers, low-level DSP functions, and third-party algorithms.

The ADAU1442, ADAU1445 and ADAU1446 are packed in 100-lead QFP and with temperature range of -40C to +105C. The ADAU1446 will be available next month for $8.28 in 1,000 unit quantities. The ADAU1442 and ADAU1445 will be available in December for $9.96 and $9.31 each, respectively, in 1,000-unit quantities.

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