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TechSpec
  • Foreword
  • 1 Scope
  • 2 References
  • 3 Technical Description of VAD Option 1
    • 3.1 Definitions, symbols and abbreviations
    • 3.2 General
    • 3.3 Functional description
      • 3.3 Functional description
      • 3.3.1 Filter bank and computation of sub-band levels
      • 3.3.2 Pitch detection
      • 3.3.3 Tone detection
      • 3.3.4 Correlated Complex Signal Analysis (and detection)
      • 3.3.5 VAD decision
  • 4 Technical Description of VAD Option 2
    • 4.1 Definitions, symbols and abbreviations
    • 4.2 General
    • 4.3 Functional description
      • 4.3 Functional description
      • 4.3.1 Frequency Domain Conversion
      • 4.3.2 Channel Energy Estimator
      • 4.3.3 Channel SNR Estimator
      • 4.3.4 Voice Metric Calculation
      • 4.3.5 Frame SNR and Long-Term Peak SNR Calculation
      • 4.3.6 Negative SNR Sensitivity Bias
      • 4.3.7 VAD Decision
      • 4.3.8 Spectral Deviation Estimator
      • 4.3.9 Sinewave Detection
      • 4.3.10 Background Noise Update Decision
      • 4.3.10 Background Noise Estimate Update
  • 5 Computational details

4.3.9 Sinewave Detection

26.0943GPPAdaptive Multi-Rate (AMR) speech codecMandatory speech CODEC speech processing functionsRelease 17TSVoice Activity Detector (VAD)

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

Next the sinewave_flag is set TRUE when the spectral peak-to-average ratio (m) is greater than 10, i.e.

(4.21)

where:

(4.22)