5970453966404342526GeneralAudioDSP_v02| Application Note
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Next generation Audio Processing on today's Digital Signal Processors By Paul Wheeler & Ken Waurin The availability of low cost DVD players/recorders as well as affordable home theater systems has enabled millions of consumers to experience high-quality surround sound audio. Multi-channel surround sound once thought to be the sole property of a limited number of audio enthusiasts is now commonplace in the home, and is swiftly becoming more available in automobiles. High-performance, programmable DSP technology has played a key role in the advance of this market segment and, given current trends, will continue to be essential to future market growth. As is typical in many consumer markets, surround sound audio equipment manufacturers continually add value to their products by integrating new features and capabilities or by making them easier to use. In the case of home audio products, there is an ever-increasing array of decoders and post-processing formats that must be supported. Additionally, most major
IP providers have proposed new algorithms that increase audio channel count and sample rates while leveraging new high speed interfaces such as HDMI and IEEE-1396. Typically these upgraded algorithms are more computationally complex than their predecessors, thus increasing the processing load on the audio processing DSP. The technology landscape in automotive audio systems is becoming equally complicated. In addition to the required multi-channel audio processing, sophisticated network processing is becoming more prevalent due to the increased bandwidth requirements of the high performance audio and video systems. In particular, the MOST (Media Oriented System Transport) optical network with its associated DTCP encryption methodology is becoming adopted in many high- and mid-end vehicles. This trend, combined with the fact that automotive audio systems typically have to accommodate a wider variety of input sources (AM/FM tuner, CD, DVD drive, Cellular phone, Navigation system input) and sample frequencies a
pplies increased pressure to DSP suppliers to provide higher performance and more highly integrated processors. Background With all of the various combinations of multi-channel audio decoder, virtualizer, and post-processing formats, today's audio processing engines have to be very flexible. A high performance digital signal processor (DSP) is ideal for running the decoders and has the programmability and flexibility to perform the additional functions like automatic room equalization. Whether the signal processing is performed in the DVD component or the AVR system, the digital signal processor is the central processing engine of the entire system. With such audio sources as PCM, SACD, DVD Audio, DTS, AC3, AAC, WMA and post processing algorithms such as DPLII, Neo6, Surround EX, ES Matrix, Bass, delay and custom post processing modules, the processor must support a myriad of combinations while dynamically detecting changes in the input streams to invoke the correct decoding software. To improve the user exp
erience, many of today's A/V receivers include an automatic calibration and equalization feature. Until recently, this audio environmental tuning
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