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Content for TS 26.094 Word version: 18.0.0

1… 2…

3.1 Definitions, symbols and abbreviations 3.2 General 3.3 Functional description 4.1 Definitions, symbols and abbreviations 4.2 General 4.3 Functional description

2 References p. 5

3 Technical Description of VAD Option 1 p. 5

3.1 Definitions, symbols and abbreviations p. 5

3.1.1 Definitions p. 5

3.1.2 Symbols p. 5

3.1.2.1 Variables p. 5

3.1.2.2 Constants p. 6

3.1.2.3 Functions p. 7

3.1.3 Abbreviations p. 7

3.2 General p. 7

3.3 Functional description p. 7

3.3.1 Filter bank and computation of sub-band levels p. 8

3.3.2 Pitch detection p. 10

3.3.3 Tone detection p. 10

3.3.4 Correlated Complex Signal Analysis (and detection) p. 11

3.3.5 VAD decision p. 11

3.3.5.1 Hangover addition p. 12

3.3.5.2 Background noise estimation p. 14

4 Technical Description of VAD Option 2 p. 16

4.1 Definitions, symbols and abbreviations p. 16

4.1.1 Definitions p. 16

4.1.2 Symbols p. 16

4.1.2.1 Variables p. 16

4.1.2.2 Constants p. 17

4.1.2.3 Functions p. 17

4.1.3 Abbreviations p. 18

4.2 General p. 18

4.3 Functional description p. 18

4.3.1 Frequency Domain Conversion p. 19

4.3.2 Channel Energy Estimator p. 19

4.3.3 Channel SNR Estimator p. 20

4.3.4 Voice Metric Calculation p. 20

4.3.5 Frame SNR and Long-Term Peak SNR Calculation p. 20

4.3.6 Negative SNR Sensitivity Bias p. 21

4.3.7 VAD Decision p. 21

4.3.8 Spectral Deviation Estimator p. 22

4.3.9 Sinewave Detection p. 22

4.3.10 Background Noise Update Decision p. 23

4.3.11 Background Noise Estimate Update p. 23

5 Computational details p. 24

$ Change history p. 25