| Index: third_party/WebKit/LayoutTests/webaudio/BiquadFilter/tail-time-peaking.html
|
| diff --git a/third_party/WebKit/LayoutTests/webaudio/BiquadFilter/tail-time-peaking.html b/third_party/WebKit/LayoutTests/webaudio/BiquadFilter/tail-time-peaking.html
|
| new file mode 100644
|
| index 0000000000000000000000000000000000000000..973d83617d2d114df50b80a55358a539296322a0
|
| --- /dev/null
|
| +++ b/third_party/WebKit/LayoutTests/webaudio/BiquadFilter/tail-time-peaking.html
|
| @@ -0,0 +1,115 @@
|
| +<!doctype html>
|
| +<html>
|
| + <head>
|
| + <title>Test Biquad Tail-Time</title>
|
| + <script src="../../resources/testharness.js"></script>
|
| + <script src="../../resources/testharnessreport.js"></script>
|
| + <script src="../resources/audit-util.js"></script>
|
| + <script src="../resources/audit.js"></script>
|
| + <script src="../resources/biquad-filters.js"></script>
|
| + <script src="test-tail-time.js"></script>
|
| + </head>
|
| +
|
| + <body>
|
| + <script>
|
| + let audit = Audit.createTaskRunner();
|
| +
|
| + let sampleRate = 16384;
|
| + let renderSeconds = 1;
|
| + let renderFrames = renderSeconds * sampleRate;
|
| +
|
| + // For a peaking filter:
|
| + // b0 = 1 - alpha*A
|
| + // b1 = -2*cos(w0)
|
| + // b2 = 1 + alpha*A
|
| + // a0 = 1 + alpha/A
|
| + // a1 = -2*cos(w0)
|
| + // a2 = 1 - alpha/A
|
| + //
|
| + // where alpha = sin(w0)/(2*Q), w0 = 2*%pi*f0/Fs, and A = 10^(G/40)
|
| + //
|
| + // Equivalently a1 = -2*cos(w0)/(1+alpha/A), a2 = (1-alpha/A)/(1+alpha/A).
|
| + // The poles of this filter are at
|
| + //
|
| + // A*cos(w0)/(A + alpha) +/- sqrt(alpha^2-A^2*sin(w0)^2)/(A + alpha)
|
| + //
|
| + // But alpha^2-A^2*sin(w0)^2 = sin(w0)^2*(1/4/Q^2-1).
|
| + // Thus, the poles are complex if 1/(4*Q^2) < A^2; real and distinct if
|
| + // 1/(4*Q^2)>A^2; and repeated if 1/(4*Q^2) = A^2 or w0 = 0.
|
| +
|
| + // Array of tests to run. |descripton| is the task description for
|
| + // audit.define. |parameters| is option for |testTailTime|.
|
| + let tests = [
|
| + {
|
| + descripton:
|
| + {label: 'peaking-complex-roots', description: 'complex roots'},
|
| + parameters: {
|
| + prefix: 'Peaking complex roots',
|
| + // A gain of 40 gives A = 10.
|
| + filterOptions:
|
| + {type: 'peaking', Q: 10, gain: 40, frequency: sampleRate / 4},
|
| + // Node computed tail frame is 2077.4 frames, which matches the
|
| + // actual tail, so tail output should be exactly zero.
|
| + threshold: 0
|
| + }
|
| + },
|
| + {
|
| + descripton: {
|
| + label: 'peaking-real-distinct-roots',
|
| + description: 'real distinct roots'
|
| + },
|
| + parameters: {
|
| + prefix: 'Peaking real distinct roots',
|
| + filterOptions: {
|
| + type: 'peaking',
|
| + Q: 0.001,
|
| + gain: 40,
|
| + frequency: sampleRate / 4
|
| + },
|
| + // Node computed tail frame is 588 frames, which matches the actual
|
| + // tail, so tail output should be exactly zero.
|
| + threshold: 0
|
| + }
|
| + },
|
| + {
|
| + descripton: {
|
| + label: 'peaking-repeated-roots',
|
| + description: 'repeated real root'
|
| + },
|
| + parameters: {
|
| + prefix: 'Peaking repeated roots',
|
| + filterOptions:
|
| + {type: 'peaking', Q: 1 / 2, gain: 0, frequency: sampleRate / 8},
|
| + // Node computed tail frame is 0 frames, which matches the actual
|
| + // tail, so tail output should be exactly zero.
|
| + threshold: 0
|
| +
|
| + }
|
| + },
|
| + {
|
| + descripton: {
|
| + label: 'peaking-repeated-roots 2',
|
| + description: 'repeated real root'
|
| + },
|
| + parameters: {
|
| + prefix: 'Peaking repeated roots 2',
|
| + filterOptions: {type: 'peaking', Q: 1, gain: 40, frequency: 0},
|
| + // Node computed tail frame is 1 frames, which matches the actual
|
| + // tail, so tail output should be exactly zero.
|
| + threshold: 0
|
| + }
|
| + }
|
| + ];
|
| +
|
| + // Define an appropriate task for each test.
|
| + tests.forEach(entry => {
|
| + audit.define(entry.descripton, (task, should) => {
|
| + let context = new OfflineAudioContext(1, renderFrames, sampleRate);
|
| + testTailTime(should, context, entry.parameters).then(() => task.done());
|
| + });
|
| + });
|
| +
|
| + audit.run();
|
| + </script>
|
| + </body>
|
| +</html>
|
|
|
Chromium Code Reviews
Issue 2862373002:
Compute tail time from Biquad coefficients (Closed)
