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NSAM266SAA/V 数据表(PDF) 43 Page - National Semiconductor (TI) |
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NSAM266SAA/V 数据表(HTML) 43 Page - National Semiconductor (TI) |
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43 / 52 page  20 Software (Continued) TABLE 2-2 Tunable Parameters Index Parameter Name Description Default 0 – 3 Reserved 4 SIL THRESHOLD Prevents speech from being interpreted as silence The silence detection 11264 algorithm has an adaptive threshold which is changed according to the noise level This parameter is therefore only the initial threshold level Legal values 9216 to 13824 in 512 (6 dB) steps 5 SIL THRESHOLD STEP Defines the adaptive threshold changes step 12 If this threshold is too low the threshold converges too slowly If it is too high silence detection is too sensitive to any noise Legal values 3 to 48 6 SIL BURST THRESHOLD The minimum time period for speech detection during silence As this 2 threshold increases the time period interpreted as silence increases If this threshold is too low a burst of noise is detected as speech If it is too high words may be partially cut off Legal values 1 to 3 7 SIL HANG THRESHOLD The minimum time period for silence detection during speech As this 15 threshold increases the time period interpreted as silence decreases If this threshold is too low words may be partially cut off If it is too high silence is detected Legal values 8 to 31 8 SIL ENABLE Silence compression control 1 0 turns silence compression off 9 ENERGY FACTOR Determines the energy level used to synthesize silence For the default value 8192 the energy levels of the synthesized silence and the recorded silence are the same If you divide (multiply) the default value by two the synthesized silence is 6 dB less (more) than the level of the recorded silence Legal values 1024 to 16384 10 VOX ENERGY THRESHOLD This constant determines the minimum energy level at which voice is 12 detected Below this level it is interpreted as silence If you divide (multiply) the value by 2 you get 3 dB decrease (increase) in the threshold Legal values 0 to 65535 11 Reserved 12 VOX TIME COUNT This constant in units of 10 ms determines the period of silence before the 700 CompactSPEECH reports silence The accuracy of the constant is g10 ms Legal values 0 to 65535 13 – 15 Reserved http www nationalcom 43 |
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