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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)： | 25/117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
25
(bit 7) indicates that information in the Line Status has
not been read by Host yet. This bit will be set by the
D6571E each time when the status is updated by the
D6571E. The bit will be reset to 0 each time when the
status is read by the Host
DTMF, Tone, Ext. Tone (bits 0 - 5)
See SpeakerPhone command description and Line
Monitor mode description for the bit assignment.
New Status (bit # 7)
When set indicates that the status has been updated by
the D6571E and has not been read yet by the Host. Will
be set to 1 by the D6571E each time when the D6571E
updates the status. Will be reset to 0 after Host reads
the status.
Mode = 001 (SpeakerPhone Parameters)
In this mode, the D6571E sets the “soft” SpeakerPhone
parameters.
Speaker Volume (bits 6-3)
This parameter will control the Speaker output signal
level
.
See the Command Set description for possible
values of this parameter.
Line Volume (bits 8-7)
This parameter will control the volume transmitted to the
telephone line. See the Command Set description for
possible values of this parameter.
Loop Attenuation (Bits 2-0)
This parameter defines the target loop attenuation in the
system. See the Command Set description for possible
values of this parameter. Also see the description at the
end of this section for a description of the Loop
Adjustment mode.
Mode = 010 (SpeakerPhone Configuration)
In this mode, the D6571E sets the echo cancellation and
loop adjustment modes.
Automatic Loop Adjustment (Bits 1-0)
This parameter controls the loop attenuation allowing
for automatic control or a specific setting for abnormal
conditions. See the Command Set description for
possible values of this parameter. Also see the
description at the end of this section for a description of
how the SpeakerPhone is controlled in the various
modes available.
Line Training (Bits 3-2)
This parameter sets the type of training of the EEC. The
default and recommended mode is Voice Adaptation
mode. Alternatively white noise can be injected to the
telephone line. Then the D6571E will automatically
returns back to the voice adaptation mode. See the
Command Set description for possible values of this
parameter. Also see the description at the end of this
section for a description of how the SpeakerPhone is
controlled in the various modes available.
Twist (bit 6-7)
Defines the twist of the DTMF tone generated in the
SpeakerPhone mode. Twist defines the attenuation of
the lower frequency of the dual frequency signal.
DT (bits 5-4)
Defines the threshold for the Dial Tone detector. Level
below the threshold is considered noise and would not
be detected.
Mode = 011 (SpeakerPhone Configuration 2)
Defines additional options for the SpeakerPhone.
Speaker Noise
(bit 7)
When the Speaker Noise bit is set, a white noise pulse
of duration 250 msec is injected into the speaker. After
the pulse the DSP automatically returns to the
adaptation mode of the AEC.
Line Noise (bit 6)
When the Line Noise bit is set, a white noise pulse of
duration 250 msec is injected into the line. (This is
equivalent to Line Training Type 1 in the SpeakerPhone
Configuration Command). After the pulse the DSP
automatically returns to the adaptation mode of the LEC.
Line Processing (bit 5)
This option allows additional linear processing to
reduce the far end residual echo by 6 dB.
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