Audyssey Upgrades Room-Correction Tech

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developed by Audyssey Labs for home audio components delivers 32-times the resolution of MultEQ XT technology with the same processing power.

Chris Kyriakakis, Audyssey Labs' chief technology officer told TWICE the new technology, called MultEQ XT 32, is "pushing the limits of room correction" and is already incorporated in multiple new products from Denon and Onkyo, he said.

Limited by the processing power of current-generation chips used in home audio components, MultEQ XT corrects for frequency-response and time-domain errors at several hundred points across the frequency spectrum, but MultEQ XT 32 expands that to more than 10,000 points by using processing power in a smarter fashion, Kyriakakis explained.

The new technology uses different sampling rates in different bands, assigning lower sampling rates to bands that don't need a higher rate to deliver optimum sound. "Below 200Hz, you don't need to sample at 96kHz," he pointed out.

With the same processing power, MultEQ XT 32 delivers 32 times the resolution, enabling the technology to correct for a greater number of narrower response peaks and dips. The finer control "shows most in the low frequencies below 250Hz where most problems occur," he said.

As with MultEQ XT, the new technology selects the filter points based on a particular room's acoustics.

MultEQ XT 32 comes in handy because of the processing-power limits on audio DSPs used in audio components, Kyriakakis explained. "There's so much technology on the chips," and Audyssey has to share the processor's MIPs (millions of instructions per second) with other technologies.

Audyssey can also apply its new processing techniques to its Mult EQ XT technology to reduce the processing power required by Mult EQ XT, thus bringing that technology to lower priced audio components, he said.

In contrasting Audyssey's room-correction technology with competing technologies built into audio components, Kyriakakis noted that the other technologies use parametric equalization to correct for room acoustics only in the frequency domain, whereas Audyssey corrects in the frequency and time domains. Competing technologies also correct only in about 10 bands within the audio spectrum, he added.


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