metadata_schema.json

{
  "dataset_name": "HTMOneShotLoopClassification",
  "version": "1.0.0",
  "description": "Metadata schema for HTMOneShotLoopClassification dataset features",
  "total_features": 55,
  "features": [
    {
      "name": "filename",
      "type": "string",
      "description": "Original audio filename"
    },
    {
      "name": "stem",
      "type": "categorical",
      "description": "Target classification category (kick, snare, hihat, bass, synth, vocal, percussion, fx)",
      "values": ["kick", "snare", "hihat", "bass", "synth", "vocal", "percussion", "fx"]
    },
    {
      "name": "category",
      "type": "categorical",
      "description": "Sample type: 'one-shots' or 'loops'",
      "values": ["one-shots", "loops"]
    },
    {
      "name": "subfolder",
      "type": "string",
      "description": "Subfolder path within category (optional)"
    },
    {
      "name": "duration",
      "type": "float",
      "description": "Audio duration in seconds",
      "range": [0.0, "varies"]
    },
    {
      "name": "sample_rate",
      "type": "integer",
      "description": "Audio sample rate in Hz",
      "typical_value": 44100
    },
    {
      "name": "rms",
      "type": "float",
      "description": "Root Mean Square energy (loudness measure)",
      "range": [0.0, 1.0]
    },
    {
      "name": "zcr",
      "type": "float",
      "description": "Zero Crossing Rate (noisiness measure)",
      "range": [0.0, 1.0]
    },
    {
      "name": "spectral_centroid",
      "type": "float",
      "description": "Spectral centroid in Hz (brightness measure)",
      "range": [0.0, "varies"]
    },
    {
      "name": "spectral_rolloff",
      "type": "float",
      "description": "Spectral rolloff frequency in Hz (high-frequency content)",
      "range": [0.0, "varies"]
    },
    {
      "name": "spectral_bandwidth",
      "type": "float",
      "description": "Spectral bandwidth in Hz (frequency spread)",
      "range": [0.0, "varies"]
    },
    {
      "name": "tempo",
      "type": "float",
      "description": "Detected tempo in BPM (0.0 if not detected)",
      "range": [0.0, "varies"]
    },
    {
      "name": "onset_count",
      "type": "integer",
      "description": "Number of detected onsets (transient events)",
      "range": [0, "varies"]
    },
    {
      "name": "pitch_mean",
      "type": "float",
      "description": "Mean fundamental frequency in Hz (0.0 if not detected)",
      "range": [0.0, "varies"]
    },
    {
      "name": "harmonic_ratio",
      "type": "float",
      "description": "Ratio of harmonic to total energy (tonal vs noisy)",
      "range": [0.0, 1.0]
    },
    {
      "name": "percussive_ratio",
      "type": "float",
      "description": "Ratio of percussive to total energy",
      "range": [0.0, 1.0]
    },
    {
      "name": "freq_sub_bass",
      "type": "float",
      "description": "Energy in sub-bass frequency band (20-60 Hz)",
      "range": [0.0, 1.0]
    },
    {
      "name": "freq_bass",
      "type": "float",
      "description": "Energy in bass frequency band (60-250 Hz)",
      "range": [0.0, 1.0]
    },
    {
      "name": "freq_low_mid",
      "type": "float",
      "description": "Energy in low-mid frequency band (250-2000 Hz)",
      "range": [0.0, 1.0]
    },
    {
      "name": "freq_high_mid",
      "type": "float",
      "description": "Energy in high-mid frequency band (2000-6000 Hz)",
      "range": [0.0, 1.0]
    },
    {
      "name": "freq_high",
      "type": "float",
      "description": "Energy in high frequency band (6000+ Hz)",
      "range": [0.0, 1.0]
    },
    {
      "name": "filepath",
      "type": "string",
      "description": "Full file path to original audio file"
    },
    {
      "name": "spectral_contrast_1",
      "type": "float",
      "description": "Spectral contrast in frequency band 1",
      "range": ["varies"]
    },
    {
      "name": "spectral_contrast_2",
      "type": "float",
      "description": "Spectral contrast in frequency band 2",
      "range": ["varies"]
    },
    {
      "name": "spectral_contrast_3",
      "type": "float",
      "description": "Spectral contrast in frequency band 3",
      "range": ["varies"]
    },
    {
      "name": "spectral_contrast_4",
      "type": "float",
      "description": "Spectral contrast in frequency band 4",
      "range": ["varies"]
    },
    {
      "name": "spectral_contrast_5",
      "type": "float",
      "description": "Spectral contrast in frequency band 5",
      "range": ["varies"]
    },
    {
      "name": "spectral_contrast_6",
      "type": "float",
      "description": "Spectral contrast in frequency band 6",
      "range": ["varies"]
    },
    {
      "name": "spectral_contrast_7",
      "type": "float",
      "description": "Spectral contrast in frequency band 7",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_1",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 1",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_2",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 2",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_3",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 3",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_4",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 4",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_5",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 5",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_6",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 6",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_7",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 7",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_8",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 8",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_9",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 9",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_10",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 10",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_11",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 11",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_12",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 12",
      "range": ["varies"]
    },
    {
      "name": "mfcc_mean_13",
      "type": "float",
      "description": "Mean of Mel-Frequency Cepstral Coefficient 13",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_1",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 1",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_2",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 2",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_3",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 3",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_4",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 4",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_5",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 5",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_6",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 6",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_7",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 7",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_8",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 8",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_9",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 9",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_10",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 10",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_11",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 11",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_12",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 12",
      "range": ["varies"]
    },
    {
      "name": "mfcc_std_13",
      "type": "float",
      "description": "Standard deviation of Mel-Frequency Cepstral Coefficient 13",
      "range": ["varies"]
    }
  ],
  "extraction_method": "librosa",
  "notes": "Features extracted using librosa audio analysis library. MFCCs computed with 13 coefficients. Spectral features computed from magnitude spectrogram. Frequency bands sum to 1.0 (normalized energy distribution)."
}