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This commit is contained in:
Ken Cooke 2017-10-05 09:28:30 -07:00
parent d8341a0929
commit 82d13090f9
1 changed files with 4 additions and 0 deletions
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libraries/audio/src/AudioDynamics.h
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@ -397,6 +397,8 @@ public:
// Fast FIR attack/lowpass filter using a 2-stage CIC filter. // Fast FIR attack/lowpass filter using a 2-stage CIC filter.
// The step response reaches final value after N-1 samples. // The step response reaches final value after N-1 samples.
// NOTE: CIC integrators intentionally overflow, using modulo arithmetic.
// See E. B. Hogenauer, "An economical class of digital filters for decimation and interpolation"
const int32_t CICGAIN = 0xffffffff / (CIC1 * CIC2); // Q32 const int32_t CICGAIN = 0xffffffff / (CIC1 * CIC2); // Q32
x = MULHI(x, CICGAIN); x = MULHI(x, CICGAIN);
@ -462,6 +464,8 @@ public:
// Fast FIR attack/lowpass filter using a 2-stage CIC filter. // Fast FIR attack/lowpass filter using a 2-stage CIC filter.
// The step response reaches final value after N-1 samples. // The step response reaches final value after N-1 samples.
// NOTE: CIC integrators intentionally overflow, using modulo arithmetic.
// See E. B. Hogenauer, "An economical class of digital filters for decimation and interpolation"
const int32_t CICGAIN = 0xffffffff / (CIC1 * CIC2); // Q32 const int32_t CICGAIN = 0xffffffff / (CIC1 * CIC2); // Q32
x = MULHI(x, CICGAIN); x = MULHI(x, CICGAIN);