Audio: Multiband DRC: Use optimized 4th order IIR filter version #9808
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The 4th filter with two biquads in series is commonly used in crossover and multiband DRC components. The omitting of outer loop for parallel biquads and check for null coefficients and use of fixed loop count of two makes the critical code faster. Signed-off-by: Seppo Ingalsuo <[email protected]>
This patch changes crossover component to use the optimized 4th order IIR function. The LR4 (Linkwitz-Riley 4th order) filter bank is hard-coded to 4th order, so this change does no add restrictions. The filter bank is used by multiband DRC component. The saving in three bands configuration is 5.2 MCPS in a HiFi5 platform. Signed-off-by: Seppo Ingalsuo <[email protected]>
This patch changes in multiband DRC component the emphasis and de-emphasis IIR filters to use the optimized 4th order IIR code. The patch for crossover already covered the bands filter bank. This change saves additional 2 MCPS in a HiFi5 build of the component. The change is not restricting configuration. The existing filters are hard-coded to 4th order (SOF_EMP_DEEMP_BIQUADS). Signed-off-by: Seppo Ingalsuo <[email protected]>
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WIP - I'll see if I can further improve the HiFi4 and HiFi5 IIR versions. |
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The simpler 4th order hard-coded IIR version saves MCPS in in band split filter bank and emphasis/de-emphasis IIR filters.