diff options
Diffstat (limited to 'tools/mq_editor/fft.js')
| -rw-r--r-- | tools/mq_editor/fft.js | 19 |
1 files changed, 6 insertions, 13 deletions
diff --git a/tools/mq_editor/fft.js b/tools/mq_editor/fft.js index 36b9936..9b9bc94 100644 --- a/tools/mq_editor/fft.js +++ b/tools/mq_editor/fft.js @@ -109,7 +109,7 @@ class STFTCache { this.sampleRate = sampleRate; this.fftSize = fftSize; this.hopSize = hopSize; - this.frames = []; // Array of {time, offset, spectrum} + this.frames = []; // Array of {time, offset, squaredAmplitude} this.compute(); } @@ -131,18 +131,16 @@ class STFTCache { windowed[i] = frame[i] * w; } - // Compute FFT - const spectrum = realFFT(windowed); - - // Cache squared amplitudes (re*re + im*im, no sqrt) + // Compute FFT, store only squared amplitudes (re*re + im*im, no sqrt) + const fftOut = realFFT(windowed); const squaredAmplitude = new Float32Array(this.fftSize / 2); for (let i = 0; i < this.fftSize / 2; ++i) { - const re = spectrum[i * 2]; - const im = spectrum[i * 2 + 1]; + const re = fftOut[i * 2]; + const im = fftOut[i * 2 + 1]; squaredAmplitude[i] = re * re + im * im; } - this.frames.push({time, offset, spectrum, squaredAmplitude}); + this.frames.push({time, offset, squaredAmplitude}); } } @@ -175,11 +173,6 @@ class STFTCache { return this.getFrameAtIndex(frameIdx); } - getFFT(t) { - const frame = this.getFrameAtTime(t); - return frame ? frame.spectrum : null; - } - getSquaredAmplitude(t) { const frame = this.getFrameAtTime(t); return frame ? frame.squaredAmplitude : null; |
