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DC filter cutoff at 0.5Hz

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This commit is contained in:
Ken Cooke 2017-08-24 11:20:22 -07:00
parent 4a253023ee
commit 684b7fee5a
1 changed files with 4 additions and 4 deletions
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8
libraries/audio/src/AudioGate.cpp
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@ -25,10 +25,10 @@ static inline int32_t saturateQ30(int32_t x) {
} }
// //
// First-order DC-blocking filter, with zero at 1.0 and pole at 0.99994 // First-order DC-blocking filter, with zero at 1.0 and pole at 0.9999
// //
// -3dB @ 0.5 Hz (48KHz) // -3dB @ 1.0 Hz (48KHz)
// -3dB @ 0.2 Hz (24KHz) // -3dB @ 0.5 Hz (24KHz)
// //
// input in Q15, output in Q30 // input in Q15, output in Q30
// //
@ -41,7 +41,7 @@ public:
x <<= 15; // scale to Q30 x <<= 15; // scale to Q30
x -= _dcOffset; // remove DC x -= _dcOffset; // remove DC
_dcOffset += x >> 14; // pole = (1.0 - 2^-14) = 0.99994 _dcOffset += x >> 13; // pole = (1.0 - 2^-13) = 0.9999
} }
}; };