參數(shù)資料
型號(hào)： NSAM266SAA
廠商： National Semiconductor Corporation
元件分類： FLASH
英文描述： 4 Mbit Uniform Sector, Serial Flash Memory
中文描述： 4兆位統(tǒng)一部門，串行閃存
文件頁(yè)數(shù)： 43/52頁(yè)
文件大?。?/td> 571K
代理商： NSAM266SAA
2.0 Software
(Continued)
TABLE 2-2. Tunable Parameters
Index
Parameter Name
Description
Default
0–3
Reserved
D
4
DSILDTHRESHOLD
Prevents speech from being interpreted as silence. The silence detection
algorithm has an adaptive threshold, which is changed according to the noise
level. This parameter is, therefore, only the initial threshold level.
11264
Legal values: 9216 to 13824 in 512 (6 dB) steps.
5
DSILDTHRESHOLDDSTEP
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
DSILDBURSTDTHRESHOLD
The minimum time period for speech detection during silence. As this
threshold increases, the time period interpreted as silence increases.
2
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
DSILDHANGDTHRESHOLD
The minimum time period for silence detection, during speech. As this
threshold increases, the time period interpreted as silence decreases.
15
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
DSILDENABLE
Silence compression control.
0 turns silence compression off.
1
9
DENERGYDFACTOR
Determines the energy level used to synthesize silence. For the default value,
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.
8192
Legal values: 1024 to 16384.
10
VOXDENERGYDTHRESHOLD
This constant determines the minimum energy level at which voice is
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.
12
Legal values: 0 to 65535.
11
Reserved
12
VOXDTIMEDCOUNT
This constant, in units of 10 ms, determines the period of silence before the
CompactSPEECH reports silence. The accuracy of the constant is
g
10 ms.
700
Legal values: 0 to 65535.
13–15
Reserved
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