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參數(shù)資料
| 型號(hào)： | D6571E |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Chip for an All-Digital Telephone Answering Machine with Flash Memory Interface |
| 中文描述： | 芯片的全數(shù)字電話應(yīng)答機(jī)與快閃記憶體介面 |
| 文件頁(yè)數(shù)： | 21/117頁(yè) |
| 文件大?。?/td> | 551K |
| 代理商： | D6571E |
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D6571E Data Sheet
DS6571E.2
DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490
21
Minimum Level Emin
- minimum input signal energy
level that is amplified to optimum value Eopt. For
signals greater than Emin the AGC gain is calculated as
G = Eopt/Einput
Maximum gain Gmax = Eopt/Emin
Gain Threshold Level Eatt -
signals smaller than Emin
and larger than Eatt are amplified by maximum gain Gmax
Silence Threshold Level Es il
- signals lower than Esil
are considered silence. The gain for such signals = 1.
Signals greater than Esil but smaller than Eatt will be
amplified by the gain linearly growing from 1 to Gmax.
Hold Time Thold
- this parameter the hold time of the
AGC gain during the pause in the speech. The intent of
the decay time is to “bridge” the gaps between syllables
and words resulting in stable gain.
Decay Time Tdec
- this parameter defines the rate by
which the gain increases after hold time elapsed.
Default values of the parameters are presented in the
following table.
Parameter
Default
Value
(decimal)
Eopt
4 dB
Emin
22 dB
Eatt
36 dB
Esil
46 dB
Thold
100
Tdecay
10
* -
Calculated as (3 - Value) dBm
Default
Value (hex)
Default Value
(Physical
meaning)
- 1 dBm*
- 19 dBm*
- 33 dBm*
- 43 dBm*
2.0 sec
1.0 sec
0004
0016
0024
002E
0064
000A
0
1
E
sil
E
att
E
min
E
opt
Gain function
G
Submode 011
= HPF configuration
Submode 3 enables low pass filter (enabled by default).
The performance of this mode is the same in case of
“cold” and “warm start.”
Submode 100
= FSK configuration
This submode allows to control sensitivity of the FSK
detector.
7) Volume Control (Test Mode = 1000)
This mode allows setting of the signal level playing to
the Codec. The default value is 0 dB and the volume
may be set in 2 dB steps from -42 to +16 dB or may be
muted.
This command allows the HOST to read the current
volume setting without changing it (bit 7 = 0), or set new
volume (bit 7 = 1) specified in bits 0 through 4. The
status will reflect the current volume setting.
The Volume Control command can be issued in Record,
Playback, Voice Prompt and Line Monitor Mode without
interrupting these modes. When issued in one of these
modes, the status will be the status of the current
operating mode. Therefore, current volume setting can
not be read during operating modes.
The performance of this mode is the same in case of
“cold” and “warm start.”
8) Storage Configuration (Test Mode = 1001)
This mode allows to define necessary space of the
General Purpose Storage. GPS can occupy up to 16
sectors 3200 bytes each sector. By default GPS is not
available (0 sectors).
9) Program DTMF, VOX, CPT, CAS Sensitivity (Test
Mode = 1010)
The mode allows independent setting of the sensitivity
of the DTMF detection, CAS detection, VOX detection,
and Call Progress Tone detection. The default
sensitivity level is 0 dB and each sub-system may be
adjusted in 2 dB steps from -16 dB (most sensitive) to
+42 dB (least sensitive)or can be disabled.
This command also allows the HOST to read the current
sensitivity setting of the selected signaling subsystem
(specified in bits 6 - 7) without changing this setting (bit
5 = 0). When bit 5 = 1, the command sets the new
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