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參數資料
| 型號： | ISD-SR3000 |
| 文件頁數： | 106/120頁 |
| 文件大小： | 1293K |
| 代理商： | ISD-SR3000 |
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2-65
2—SOFTWARE
ISD-SR3000
ISD
Table 2-17: Tunable Parameters LIsted by Index Number
Parameter Name
Index
Description
Default
15
Tone Generation:
TONE_GEN_LEVEL
Controls the energy level at which DTMF and other tones
are 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_GEN_LEVEL and the vol_level
parameter, controlled by the VC command. The tones are
distorted when the level is set too high.
Legal values: 0 < TONE_GEN_LEVEL + vol_level <12.
Controls the energy during playback and external voice
synthesis. 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_PLAY_LEVEL and the vol_level parameter
(controlled by the VC command). Speech is distorted when
the level is set too high.
Legal values: 0 < VCD_PLAY_LEVEL + vol_level < 12.
A one-byte value that controls the twist level of a DTMF
tone, generated by the GT command, by controlling the
energy level of each of the two tones (low frequency and
high frequency) composing the DTMF tone. The Least
Significant Nibble (LSN) controls the low tone and the Most
Significant Nibble (MSN) controls the high tone. The energy
level of each tone, as measured at the output of a TP3054
codec (before the DAA) connected to the ISD-SR3000
processor, is summarized in the following table:
Nibble Value
0
1
2
3
4
5
6
7
8 - 15
The volume of the generated DTMF tone during
measurements was 6. (TONE_GEN_LEVEL+vol_level = 6).
Note: the vol_level parameter is controlled by the VC
command.
6
20
VCD Playback and Voice
Synthesis:
VCD_PLAY_LEVEL
6
26
DTMF Generation:
DTMF_GEN_TWIST_LEVEL
Tone Energy (dB-Volts)
0
–17.8
–14.3
–12.9
–12.4
–12.0
–11.9
–11.85
–11.85
For the default level, the high tone is –14.3 dBV and the low
tone is –12.4 dBV, which gives a DTMF twist level of 1.9 dB.
The energy level of a single generated tone is the level of
the low tone.
66
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