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| author | skal <pascal.massimino@gmail.com> | 2026-02-17 20:54:15 +0100 |
|---|---|---|
| committer | skal <pascal.massimino@gmail.com> | 2026-02-17 20:54:15 +0100 |
| commit | cfcd238044c7ce06dfdf1f9e08c3842bfa07979b (patch) | |
| tree | 12cd6da868c43af9c054bc44705326c1dae5f6de /doc/SPECTRAL_BRUSH_2.md | |
| parent | d151eb48b2c55d16a1d9caa6a7affb3e0793c3e7 (diff) | |
feat(mq_editor): Complete Phase 2 - JS synthesizer with STFT cache
Phase 2 - JS Synthesizer:
- Created mq_synth.js with replica oscillator bank
- Bezier curve evaluation (cubic De Casteljau algorithm)
- Replica synthesis: frequency spread, amplitude decay, phase jitter
- PCM buffer generation from extracted MQ partials
- Normalization to prevent clipping
- Key '1' plays synthesized audio, key '2' plays original
- Playback comparison with animated playhead
STFT Cache Optimization:
- Created STFTCache class in fft.js for pre-computed windowed FFT frames
- Clean interface: getFFT(t), getMagnitudeDB(t, freq), setHopSize()
- Pre-computes all frames on WAV load (eliminates redundant FFT calls)
- Dynamic cache update when hop size changes
- Shared across spectrogram, tooltip, and mini-spectrum viewer
- Significant performance improvement
Mini-Spectrum Viewer:
- Bottom-right overlay (200x100) matching spectral_editor style
- Real-time FFT display at playhead or mouse position
- 100-bar visualization with cyan-to-yellow gradient
- Updates during playback or mouse hover
Files:
- tools/mq_editor/mq_synth.js (new)
- tools/mq_editor/fft.js (STFTCache class added)
- tools/mq_editor/index.html (synthesis playback, cache integration)
- tools/mq_editor/viewer.js (cache-based rendering, spectrum viewer)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Diffstat (limited to 'doc/SPECTRAL_BRUSH_2.md')
| -rw-r--r-- | doc/SPECTRAL_BRUSH_2.md | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/SPECTRAL_BRUSH_2.md b/doc/SPECTRAL_BRUSH_2.md index 442db6d..7714ce3 100644 --- a/doc/SPECTRAL_BRUSH_2.md +++ b/doc/SPECTRAL_BRUSH_2.md @@ -521,7 +521,13 @@ void pattern_callback(int sample_id, float volume) { - [x] Cubic bezier curve fitting for freq/amp trajectories - [x] Spectrogram visualization with zoom/scroll/playhead - [x] Original WAV playback -- [ ] Phase 2: JS synthesizer + - [x] STFT cache for optimized FFT computation + - [x] Mini-spectrum viewer +- [x] Phase 2: JS synthesizer + - [x] Bezier evaluation (cubic De Casteljau) + - [x] Replica oscillator bank (frequency spread, amplitude decay, phase jitter) + - [x] PCM synthesis from MQ partials + - [x] Playback comparison (original vs synthesized) - [ ] Phase 3: Web editor UI - [ ] Phase 4: C++ code generator - [ ] Phase 5: C++ synthesis + integration |