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參數(shù)資料
| 型號(hào)： | NSAM266SVLJ |
| 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 |
| 文件頁數(shù)： | 26/52頁 |
| 文件大?。?/td> | 571K |
| 代理商： | NSAM266SVLJ |
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2.0 Software
(Continued)
TABLE 2-1. DTMF Detector Performance
PLAY
RECORD/IDLE
Detection Sensitivity (Note A)
Performance Depends on Message
Being Played (Note B)
b
40 dBm
Accepted DTMF Length
l
50 ms
l
40 ms
Frequency Tolerance
g
1.5%
g
1.5%
S/N Ratio
12 dB
12 dB
Minimum Spacing (Note C)
l
50 ms
l
45 ms
Normal Twist
8 dB
8 dB
Reverse Twist (Note D)
4 dB or 8 dB
4 dB or 8 dB
Note A:
Performance depends on the DAA design.
Note B:
Performance with echo canceler is 10 dB better than without echo canceler. For a silent message, Detection Sensivitiy is
b
34 dBm with echo canceler.
Note C:
If the interval between two consecutive DTMF tones is
s
20 ms, the two are detected as one long DTMF tone.
If the interval between two consecutive DTMF tones is between 20 ms and 45 ms, separate detection is unpredictable.
Note D:
Determined by the DTMFDREVDTWIST tunable parameter value.
OTHER DETECTORS
Detection of busy and dial tones, and no-energy is con-
trolled by tunable parameters. You should tune these pa-
rameters to fit your hardware. For more information see the
TUNE command in Section 2.14.
Dial and busy tone detectors work with a band-pass filter
that llmits the frequency range in which tones can be de-
tected to 0 Hz–1100 Hz. Its frequency response is illustrat-
ed in Figure 2-1 and the busy tone cadences in Figure 2-2.
TONE GENERATION
The CompactSPEECH can generate DTMF tones and sin-
gle-frequency tones from 300 Hz to 3000 Hz in increments
of 100 Hz. CompactSPEECH tone generation conforms to
the EIA-470-RS standard. Note, however, that you may
have to change the value of some tunable parameters in
order to meet the standard specifications since the energy
level of generated tones depends on the analog circuits be-
ing used.
#
Tune the DTMFDTWISTDLEVEL parameter to control
the twist level of the generated DTMF tones.
#
Use
the
VC
command,
GENERATIONDLEVEL parameter, to control the energy
level at which these tones are generated.
#
Use the GT command to specify the DTMF tones, and
the frequency at which single tones are generated.
and
tune
the
TONED
TL/EE/12584–27
FIGURE 2-1. Busy and Dial-Tone Band-Pass Filter Frequency Response
TL/EE/12584–28
[
E
1
b
E
3
]
k
90 ms
[
S
1
b
S
3
]
k
90 ms
90
k
E
i
k
1650 ms
65
k
S
i
k
1250 ms
FIGURE 2-2. Busy-Tone DetectorDCadence Specification
http://www.national.com
26
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