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RNN VAD: LP residual optimized (part 1)

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Use hard-coded constants previously computed at runtime within a loop in
`ComputeAndPostProcessLpcCoefficients`.

Note that the `RnnVadTest.LpResidualPipelineBitExactness` unit test
is still passing.

Bug: webrtc:10480
Change-Id: Iaec178c56937449c3fe9af881354d19cc8c47c7d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/189961
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32462}
This commit is contained in:
Alessio Bazzica 2020-10-21 13:30:55 +02:00 committed by Commit Bot
parent 7481ba01d1
commit 5d13d61193
1 changed files with 11 additions and 11 deletions
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22
modules/audio_processing/agc2/rnn_vad/lp_residual.cc
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@ -101,17 +101,17 @@ void ComputeAndPostProcessLpcCoefficients(
ComputeInitialInverseFilterCoefficients(auto_corr, lpc_coeffs_pre);
// LPC coefficients post-processing.
// TODO(bugs.webrtc.org/9076): Consider removing these steps.
float c1 = 1.f;
for (size_t i = 0; i < kNumLpcCoefficients - 1; ++i) {
c1 *= 0.9f;
lpc_coeffs_pre[i] *= c1;
}
const float c2 = 0.8f;
lpc_coeffs[0] = lpc_coeffs_pre[0] + c2;
lpc_coeffs[1] = lpc_coeffs_pre[1] + c2 * lpc_coeffs_pre[0];
lpc_coeffs[2] = lpc_coeffs_pre[2] + c2 * lpc_coeffs_pre[1];
lpc_coeffs[3] = lpc_coeffs_pre[3] + c2 * lpc_coeffs_pre[2];
lpc_coeffs[4] = c2 * lpc_coeffs_pre[3];
lpc_coeffs_pre[0] *= 0.9f;
lpc_coeffs_pre[1] *= 0.9f * 0.9f;
lpc_coeffs_pre[2] *= 0.9f * 0.9f * 0.9f;
lpc_coeffs_pre[3] *= 0.9f * 0.9f * 0.9f * 0.9f;
constexpr float kC = 0.8f;
lpc_coeffs[0] = lpc_coeffs_pre[0] + kC;
lpc_coeffs[1] = lpc_coeffs_pre[1] + kC * lpc_coeffs_pre[0];
lpc_coeffs[2] = lpc_coeffs_pre[2] + kC * lpc_coeffs_pre[1];
lpc_coeffs[3] = lpc_coeffs_pre[3] + kC * lpc_coeffs_pre[2];
lpc_coeffs[4] = kC * lpc_coeffs_pre[3];
static_assert(kNumLpcCoefficients == 5, "Update `lpc_coeffs(_pre)`.");
}
void ComputeLpResidual(