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| 型號(hào)： | SI3210M-BT |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | Codec |
| 英文描述： | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| 中文描述： | ProSLIC產(chǎn)品可編程的CMOS用戶接口/有振鈴編解碼器/電池電壓生成 |
| 文件頁(yè)數(shù)： | 38/122頁(yè) |
| 文件大小： | 1950K |
| 代理商： | SI3210M-BT |
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Si3210/Si3211/Si3212
38
Preliminary Rev. 1.11
The pulse metering oscillator has a volume envelope
(linear ramp) on the on/off transitions of the oscillator.
The volume value is incremented by the value in the
PLSD register (indirect Register 23) at an 8 kHz rate.
The sinusoidal generator output is multiplied by this
volume before being sent to the DAC. The volume will
ramp from 0 to 7FFF in increments of PLSD so the
value of PLSD will set the slope of the ramp. When the
pulse metering signal is turned off, the volume will ramp
to 0 by decrementing according to the value of PLSD.
Figure 22. Pulse Metering Volume Envelope
DTMF Detection
The dual-tone multi-frequency (DTMF) tone signaling
standard is also known as touch tone. It is an in-band
signaling system used to replace the pulse-dial
signaling standard. In DTMF, two tones are used to
generate a DTMF digit. One tone is chosen from four
possible row tones, and one tone is chosen from four
possible column tones. The sum of these tones
constitutes one of 16 possible DTMF digits.
DTMF Detection Architecture
DTMF detection is performed using a modified Goertzel
algorithm to compute the dual frequency tone (DFT) for
each of the eight DTMF frequencies as well as their
second harmonics. At the end of the DFT computation,
the squared magnitudes of the DFT results for the eight
DTMF fundamental tones are computed. The row
results are sorted to determine the strongest row
frequency; the column frequencies are sorted as well.
At the completion of this process, a number of checks
are made to determine whether the strongest row and
column tones constitute a DTMF digit.
The detection process is performed twice within the
45 ms minimum tone time. A digit must be detected on
two consecutive tests following a pause to be
recognized as a new digit. If all tests pass, an interrupt
is generated, and the DTMF digit value is loaded into
the DTMF register. If tones are occurring at the
maximum rate of 100 ms per digit, the interrupt must be
serviced within 85 ms so that the current digit is not
Table 31. Associated Pulse Metering Generator Registers
Parameter
Description / Range
Register Bits
Location
Pulse Metering Frequency
Coefficient
Sets oscillator frequency
PLSCO[15:0]
Indirect Register 25
Pulse Metering Amplitude
Coefficient
Sets oscillator amplitude
PLSX[15:0]
Indirect Register 24
Pulse Metering Attack/Decay
Ramp Rate
0 to PLSX (full amplitude)
PLSD[15:0]
Indirect Register 23
Pulse Metering Active Timer
0 to 8 sec
PAT[15:0]
Direct Registers 44 & 45
Pulse Metering Inactive Timer
0 to 8 sec
PIT[15:0]
Direct Register 46 & 47
Pulse Metering Control
Status and control registers
PSTAT, PMAE,
PMIE, PMOE
Direct Register 35
Note:
The ProSLIC uses registers that are both directly and indirectly mapped. A “direct” register is one that is mapped
directly. An “indirect” register is one that is accessed using the indirect access registers (direct registers 28
through 31).
Pulse Metering Oscillator
Volume
+/–
PLSD
To DAC
Clip to 7FFF or 0
8 Khz
X
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SI3210 | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| SI3210-BT | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| SI3210-KT | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| SI3211-BT | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| SI3211-KT | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
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