45 lines
2.1 KiB
Go
45 lines
2.1 KiB
Go
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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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NumLayers = 11
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GainPerLayer = 1.0 / float64(NumLayers) // D-10: ~0.0909
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WhisperFloor = 0.03 // D-08/D-09: 3% of max amplitude
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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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}
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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: {65.0, []HarmonicDef{{1, 1.0}, {2, 0.4}, {3, 0.15}}, 0.0},
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classify.ClassDNS: {110.0, []HarmonicDef{{1, 1.0}, {2, 0.5}, {3, 0.25}}, -0.2},
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classify.ClassHTTPS: {175.0, []HarmonicDef{{1, 1.0}, {2, 0.6}, {3, 0.3}}, 0.2},
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classify.ClassHTTP: {220.0, []HarmonicDef{{1, 1.0}, {2, 0.5}, {4, 0.2}}, -0.35},
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classify.ClassSSH: {330.0, []HarmonicDef{{1, 1.0}, {3, 0.6}, {5, 0.3}}, 0.35},
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classify.ClassSMTP: {440.0, []HarmonicDef{{1, 1.0}, {2, 0.3}, {3, 0.1}}, -0.55},
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classify.ClassNTP: {520.0, []HarmonicDef{{1, 1.0}, {2, 0.25}}, 0.55},
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classify.ClassDHCP: {600.0, []HarmonicDef{{1, 1.0}, {2, 0.35}, {3, 0.15}}, -0.75},
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classify.ClassOtherTCP: {700.0, []HarmonicDef{{1, 1.0}, {2, 0.2}}, 0.75},
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classify.ClassOtherUDP: {780.0, []HarmonicDef{{1, 1.0}, {2, 0.2}}, -0.75},
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// D-04: 437 Hz is ~12 cents flat from A4 (440 Hz/SMTP).
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// Creates 3 Hz beating when SMTP is present = dissonant "doesn't belong" signal.
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classify.ClassUnknown: {437.0, []HarmonicDef{{1, 1.0}, {2, 0.8}, {3, 0.4}}, 0.0},
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}
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