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參數(shù)資料
| 型號： | ISD-T360SB |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | VoiceDSP Digital Speech Processor with Master/Slave, Full-Duplex Speakerphone, Multiple Flash and ARAM/DRAM Support |
| 中文描述： | VoiceDSP數(shù)字語音處理器與主/從，全雙工揚聲器，多重閃光和雅藍(lán)/內(nèi)存支持 |
| 文件頁數(shù)： | 53/109頁 |
| 文件大?。?/td> | 1567K |
| 代理商： | ISD-T360SB |
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2—SOFTWARE
ISD-T360SB
2-13
ISD
Figure 2-1: Busy and Dial-Tone Band-Pass Filter Frequency Response
BUSY AND DIAL TONES
Busy and dial-tone detectors work with a band-
pass filter that limits the frequency range in
which tones can be detected to 0–1100Hz.
Figure 1-1 shows the frequency response of this
band-pass filter.
The design of the busy-tone detector allows very
high flexibility in detecting busy tones with vary-
ing cadences.
The tunable parameters are divided into five
sets:
1.
Busy Tone On-time and Off-time Range
Specification:
BUSY_DET_MIN_ON_TIME
BUSY_DET_MIN_OFF_TIME
BUSY_DET_MAX_ON_TIME
BUSY_DET_MAX_OFF_TIME
2.
Busy Tone Cadence Control Specification
BUSY_DET_VERIFY_COUNT
BUSY_DET_TONE_TYPE
BUSY_DET_DIFF_THRESHOLD
BUSY_DET_VERIFY_COUNT
determines the
number of On/Off cadences that detec-
tor should detect before reporting busy
tone presence.
BUSY_DET_DIFF_THRESHOLD
describes the
maximum allowed difference between
two compared On or Off periods, as de-
termined by the BUSY_DET_TONE_TYPE
tunable parameter.
BUSY_DET_TONE_TYPE
specifies the type of
cadences that are supported.
Legal values are:
Two cadences only
Three cadences only
Both two and three cadences.
The acceptance criteria for two cad-
ences:
[E1–E3] < BUSY_DET_DIFF_THRESHOLD
and
[S1–S3] < BUSY_DET_DIFF_THRESHOLD
The
cadences:
acceptance
criteria
for
three
[E1–E4] < BUSY_DET_DIFF_THRESHOLD
and
[S1–S4] < BUSY_DET_DIFF_THRESHOLD
3.
Busy and Dial Tone Energy Thresholds
TONE_DET_ON_ENERGY THRESHOLD
TONE_DET_OFF_ENERGY THRESHOLD
4.
Busy Detection Time
BUSY_DET_MIN_TIME
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Frequency (Hz)
–40
–30
–20
–10
0
M
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