gurix
fd17061b0d
- Delete NumLayers=14 (dead code; NewBank computes gain dynamically) - Delete GainPerLayer=1.0/float64(NumLayers) (dead code per D-01) - Remaining constants: SampleRate, WindowMs, SamplesPerWindow, WhisperFloor
94 lines
4.5 KiB
Go
94 lines
4.5 KiB
Go
package synth
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import "github.com/netsynth/netsynth/classify"
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const (
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SampleRate = 44100 // D-13: CD quality
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WindowMs = 500 // matches aggregate.DefaultWindowMs
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SamplesPerWindow = SampleRate * WindowMs / 1000 // 22050
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WhisperFloor = 0.03 // D-08/D-09: 3% of max amplitude
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)
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// WaveformType selects the harmonic preset for a synthesis layer.
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// The zero value WaveformCustom preserves existing hand-tuned harmonics in FreqConfig.Harmonics.
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type WaveformType int
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const (
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WaveformCustom WaveformType = iota // zero value: use FreqConfig.Harmonics as-is
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WaveformSine // pure fundamental, single harmonic
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WaveformSquare // odd harmonics with 1/k amplitude (bandlimited)
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WaveformSawtooth // all harmonics with 1/k amplitude (bandlimited)
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WaveformTriangle // odd harmonics with alternating 1/k^2 amplitude (bandlimited)
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)
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// WaveformPresetHarmonics returns the bandlimited harmonic series for the given waveform type
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// at the given base frequency and sample rate. Returns nil for WaveformCustom.
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// All returned harmonics are below Nyquist (sampleRate/2).
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func WaveformPresetHarmonics(wt WaveformType, baseHz float64, sampleRate int) []HarmonicDef {
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nyquist := float64(sampleRate) / 2.0
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switch wt {
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case WaveformCustom:
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return nil
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case WaveformSine:
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return []HarmonicDef{{Ratio: 1, Amplitude: 1.0}}
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case WaveformSquare:
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var harmonics []HarmonicDef
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for k := 1; float64(k)*baseHz < nyquist; k += 2 {
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harmonics = append(harmonics, HarmonicDef{Ratio: k, Amplitude: 1.0 / float64(k)})
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}
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return harmonics
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case WaveformSawtooth:
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var harmonics []HarmonicDef
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for k := 1; float64(k)*baseHz < nyquist; k++ {
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harmonics = append(harmonics, HarmonicDef{Ratio: k, Amplitude: 1.0 / float64(k)})
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}
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return harmonics
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case WaveformTriangle:
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var harmonics []HarmonicDef
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sign := 1.0
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for k := 1; float64(k)*baseHz < nyquist; k += 2 {
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harmonics = append(harmonics, HarmonicDef{Ratio: k, Amplitude: sign / float64(k*k)})
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sign = -sign
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}
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return harmonics
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default:
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return nil
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}
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}
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// HarmonicDef defines one partial in an additive synthesizer.
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type HarmonicDef struct {
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Ratio int // harmonic number: 1=fundamental, 2=octave, 3=fifth+octave, etc.
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Amplitude float64 // relative weight
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}
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// FreqConfig holds synthesis parameters for one traffic class.
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type FreqConfig struct {
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BaseHz float64
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Harmonics []HarmonicDef
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Pan float64 // [-1, 1]: -1=full left, 0=center, +1=full right
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WaveformType WaveformType // zero value WaveformCustom uses Harmonics as-is
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}
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// ClassFreqConfigs maps each traffic class to its synthesis parameters.
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// Frequencies use musical intervals per D-02/D-03. Harmonics per D-05/D-06.
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// Pan positions per D-12.
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var ClassFreqConfigs = map[classify.TrafficClass]FreqConfig{
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classify.ClassICMP: {BaseHz: 65.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.4}, {3, 0.15}}, Pan: 0.0},
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classify.ClassDNS: {BaseHz: 110.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.5}, {3, 0.25}}, Pan: -0.2},
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classify.ClassHTTPS: {BaseHz: 175.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.6}, {3, 0.3}}, Pan: 0.2},
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classify.ClassHTTP: {BaseHz: 220.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.5}, {4, 0.2}}, Pan: -0.35},
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classify.ClassSSH: {BaseHz: 330.0, Harmonics: []HarmonicDef{{1, 1.0}, {3, 0.6}, {5, 0.3}}, Pan: 0.35},
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classify.ClassSMTP: {BaseHz: 440.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.3}, {3, 0.1}}, Pan: -0.55},
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classify.ClassNTP: {BaseHz: 520.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.25}}, Pan: 0.55},
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classify.ClassDHCP: {BaseHz: 600.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.35}, {3, 0.15}}, Pan: -0.75},
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classify.ClassOtherTCP: {BaseHz: 700.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.2}}, Pan: 0.75},
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classify.ClassOtherUDP: {BaseHz: 780.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.2}}, Pan: -0.75},
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// D-05: Unknown buckets in 850-1100 Hz dissonant range, detuned intervals
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// D-06: Same dissonant harmonic character {1,1.0},{2,0.8},{3,0.4} for all 4
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classify.ClassUnknown1: {BaseHz: 862.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.8}, {3, 0.4}}, Pan: 0.6},
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classify.ClassUnknown2: {BaseHz: 920.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.8}, {3, 0.4}}, Pan: -0.6},
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classify.ClassUnknown3: {BaseHz: 981.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.8}, {3, 0.4}}, Pan: 0.9},
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classify.ClassUnknown4: {BaseHz: 1047.0, Harmonics: []HarmonicDef{{1, 1.0}, {2, 0.8}, {3, 0.4}}, Pan: -0.9},
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}
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