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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)： | 26/117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
26
Mic VOX Position (bit 4)
Defines position of the Mic VOX detector before the
volume compensater (default) or after the volume
compensater.
Line VOX Response (bits 1-0), Mic VOX Response
(bits 3-2)
Defines frequency response of the Line and Mic VOX
detectors (flat or high pass filter).
Mode = 100 (Tone Generation)
In this mode, the D6571E will generate tones.
Tone Index (bits 4-0) and Tone Gain (bits 8-5)
Allows to generate 16 DTMF tones from the redefined
tone table. No user defined tones are available in the
SpeakerPhone mode. Even in case of “warm start”
DTMF will be generated according to the “cold start”
protocol in this mode. See the Tone Generation
command for usage and definitions.
To start generation the Host should send Tone
Generation command (Mode = 100). To stop generation
and return to SpeakerPhone, the HOST should send a
Second SpeakerPhone Command other than Tone
Generation (for example, Get Speaker Phone Status).
Mode = 101 (SpeakerPhone Parameters 2)
The Set SpeakerPhone Parameters 2 Command (Mode
101) allows additional control over the range for the
Loop Attenuation, Speaker Volume, Line Volume, and
T/R and R/T ratios. If extended range is not a
requirement,
the
Set
SpeakerPhone
Command (Mode 001) can be used rather than this
command. This command also introduces the
Acoustical Decoupling and Electrical Decoupling
parameters.
Parameter (bits 8-6):
Defines the parameter to be
set.
= 000:
Loop Attenuation
= 001:
Speaker Volume
= 010:
Acoustic Decoupling
= 011:
Line Volume
= 100:
Electrical Decoupling
= 101:
T/R and R/T ratios
= 110:
Reserved
Parameters
Value (bits 5-0)
Defines the value of the parameter to be set.
Speaker
Volume
and
Line Volume
is equivalent to the
parameters defined by Set SpeakerPhone Parameters
command with the exception that this command extends
the range of these parameters from - 20 dB to + 20 dB.
The Loop Attenuation
is the same as in the Set
SpeakerPhone Parameters command.
R/T and T/R
ratios
are the same as for the First SpeakerPhone
command with the exception that the range of control is
extended to 4.
Acoustical and Electrical Decoupling
should be set by
Host according to the actual hardware design Those
parameters define the actual volume compensation that
will set by the D6571E.
If the Speaker Volume is more than 0 dB the D6571E will
activate Speaker Volume Compensation. This
compensation will be active until AEC will be trained.
Then it will be deactivated. The amount of
compensation introduced by the D6571E is:
Speaker Volume Compensation = Speaker Volume -
Acoustical Decoupling.
The default value of the Acoustical Decoupling is 0 dB.
If this parameter is not set by Host the Speaker Volume
compensation = Speaker Volume.
Similarly if the Line Volume is more than 0 dB the
D6571E will activate Line Volume Compensation. This
compensation will be active until EEC will be trained.
Then it will be deactivated. The amount of
compensation introduced by the D6571E is:
Line Volume Compensation = Line Volume - Electrical
Decoupling.
The default value of the Acoustical Decoupling is 0 dB.
If this parameter is not set by Host the Speaker Volume
compensation = Speaker Volume.
Use of this parameters allows to reduce Volume
Compensation in the D6571E SpeakerPhone. Please,
note that Volume Compensation is valid only at the
beginning of the conversation when the echo cancellers
are not trained.
Control of Available Modes
The D6571E SpeakerPhone system actually contains
two digital echo cancellers: an adaptive acoustical
canceller (AEC) which cancels the acoustical echo
= 111:
Reserved
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