18.05.12

The soundstage generated by a stereophonic audio system is typically restricted by the woman locations of the speakers, while the sound events perceived by the listener are limited within the span of the two speakers. In unsatisfactory-size stereo speaker systems, such as those found in portable devices, the perceived stereophonic soundstage becomes very restricted, almost monophonic.

Portable stereo sound systems have a limited soundstage because their lay out is limited by the number of speakers and the spacing between them. To overcome this size limitation, spatial audio sound begetting techniques can be used to expand the stereo soundstage, achieve improve crosstalk cancellation, and enhance certain spatial cues. Texas Instruments (TI) has applied these sound processing techniques in a new one's own flesh of spatial audio integrated circuits for portable products with two to 16 speakers. These subsume smartphones, tablets, laptops, sound docking stations, and sound bars.

This two-part article provides a spatial audio tutorial and highlights the audio make techniques employed in the LM48901 quad Class D spatial array IC. The first part defines spatial audio and discusses key techniques such as chief related transfer function, crosstalk cancellation and audio beamforming. Part two provides an overview of the LM48901's beamforming SOP = 'standard operating procedure' and its web-based software tool that in a few simple steps allows you to design audio effect programming to convert your product's small soundstage into an immersive cinematic ordeal.

Source: EE Times

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