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数据搜索系统，热门电子元器件搜索 |
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NSAM266SAA/V 数据表(PDF) 44 Page - National Semiconductor (TI) |
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NSAM266SAA/V 数据表(HTML) 44 Page - National Semiconductor (TI) |
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44 / 52 page  20 Software (Continued) TABLE 2-2 Tunable Parameters (Continued) Index Parameter Name Description Default 16 TONE GENERATION LEVEL Controls the energy level at which DTMF and other tones are 6 generated Each unit represents 3 dB The default level is the reference level For example if you set this parameter to 4 the energy level is 6 dB less than the default level The actual output level is the sum of TONE GENERATION LEVEL and the VOL LEVEL variable controlled by the VC command The tones are distorted when the level is set too high The valid range is 0 s TONE GENERATION LEVEL a VOL LEVEL s 12 17 Reserved 18 TONE TIME COUNT Controls the duration of a tone before it is reported as a dial tone 700 in 10 ms units The accuracy of the constant is g10 ms Legal values 0 to 65535 19 TONE ON ENERGY THRESHOLD Minimum energy level at which busy and dial tones are detected as 160 ON (after 700 Hz filtering) If you divide (multiply) the value by 2 you geta3dB decrease (increase) in the threshold Legal values 0 to 65535 20 TONE OFF ENERGY THRESHOLD Maximum energy level at which busy and dial tones are detected as 110 OFF (after 700 Hz filtering) If you divide (multiply) the value by 2 you geta3dB decrease (increase) in the threshold Legal values 0 to 65535 21 VCD LEVEL Controls the energy during playback and external voice synthesis 6 Each unit represents 3 dB The default level is the reference level For example if you set this parameter to 4 the energy level is 6 dB less than the default level The actual output level is the sum of VCD LEVEL and the VOL LEVEL variable controlled by the VC command Speech is distorted when the level is set too high The valid range is 0 s VCD LEVEL a VOL LEVEL s 12 22 VOX TOLERANCE TIME Controls the maximum energy period in 10 ms units that does NOT 3 reset the vox detector Legal values 0 to 255 23 MIN BUSY DETECT TIME Minimum time period for busy detection in 10 ms units The accuracy 600 of the constant is g10 ms Legal values 0 to 65535 24 ECHO DELAY The near-echo delay in samples The sampling rate is 8000 Hz (ie 4 125 ms per sample) Legal values 0 to 16 25 Reserved 26 DTMF REV TWIST Controls the reverse twist level at which CompactSPEECH detects 0 DTMF tones While the normal twist is set at 8 dB the reverse twist can be either 8 dB (default) or 4 dB (If this parameter is set to 1) http www nationalcom 44 |
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