NSAM265SR Datasheet, PDF (30/58 Pages) National Semiconductor (TI) – CompactSPEECH Digital Speech Processors

3 0 Command Set (Continued)
TABLE 3-1 Tunable Parameters (Continued)
Index
Parameter Name
Description
Default
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
700
before the CompactSPEECH reports silence
Legal values 0 to 65535
13 – 14 Reserved
15 VOICE SYNTHESIS LEVEL
Controls the energy level at which internal vocabulary words are
6
output 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
VOICE SYNTHESIS LEVEL and the VOL LEVEL variable
controlled by the VC (Volume Control) command The synthesized
speech is distorted when the level is set too high The valid range is
0 ^s VOICE SYNTHESIS LEVEL a VOL LEVEL ^s 12
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
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
get 3 dB 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
get 3 dB 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 The 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
600
Legal values 0 to 65535
30