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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)： | 14/117頁(yè) |
| 文件大小： | 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
14
sending the Idle mode status word. The D6571E
assigns the next available message number to a newly
recorded message. The first message will be assigned
the number “0”, the second message will be assigned
the number “1”, and so on, up to “127”.
Record mode can be terminated by sending a Record
command with non-zero “Tail Cut” factor (TCF). The
D6571E stops recording and automatically deletes the
last n*TCF seconds from memory. The value of the TCF
is 0.160 seconds for 8000 Hz sampling rate and 0.178
seconds for 7200 Hz sampling rate. The D6571E then
returns to Idle mode. For PCM recording the value of
the TCF is 0.240 seconds and 0.266 seconds for 8 KHz
and 7.2 KHz sampling rate respectively.
Host can pause recording by sending Record command
with REC MODE = 10. The D6571E will stay in Record
mode, monitor line but won’t store data into flash. The
Host can send Record command with REC MODE = 00
to continue recording or terminate recording by Idle or
Tail Cut command.
Host can suspend recording (Record command with
REC MODE = 01). The D6571E will terminate recording
and go to Idle mode. The Host can instruct the D6571E
to perform another operation (other than Record), for
example, CID, Tone Generation, etc. Note that message
playback, voice prompt playback, and new message
recording is not available during record suspend.
Then Host may instruct the D6571E to resume recording
of the message that has been suspended. Alternatively
the Host can close the suspended message and then
start new message recording.
The Host may instruct the D6571E to change
compression rate, enable/disable Gap Coding and
Loopback (REC MODE = 11 and TONE GEN = 1). New
mode will be set in the bits NEW BIT RATE (bits 8 - 6),
LB DIS (bit 5), and GAP (bit 4).
Host can also instruct the D6571E to report current
offset in the message being recorded (REC MODE = 11
and TON GEN = 0).
A message will not be stored in the Flash memory if the
actual message length is less than 1 second. After
performing the tail cut function, or if the message length
is less than 1 second, the Garbage Collection
Recommended bit will be set (1) in the status of the
Read Memory Status command.
If the Flash memory has become full, the Memory Full
bit (bit 7) in the status word is set. The D6571E stops
recording, remains in Record mode, and continues to
perform line monitoring.
During Record mode, the HOST can instruct the D6571E
to generate a tone from the predefined tone table. The
HOST should issue a Record command with the “T” bit
(bit 9) set to “1”, Tone Gain (bits 8-5) and “Tone Index”
(bits 4-0). Tone generation will end if “Tone Index” is
“00000” along with the “T” bit set to “1”. For more
details about tone generation, see Tone Generation
command.
In Record mode, the input signal is “Looped Back” and
transmitted through the output of the CODEC. This can
be used for call screening or other purposes. If the
“Loop Back” is not necessary, the HOST can disable
this function by setting the “LB DIS” bit (bit 5) in the
first record command to “1”. The “LB DIS” bit should
usually be set to “1” if the tone generation function
during Record is used.
In case of “cold start” the Record will not be activated,
the D6571E remains in Idle mode and returns Idle status.
Playback
In playback mode, the D6571E performs message
playback and line monitoring. In the first playback
command, the HOST instructs the D6571E which
message to play, and at what F
LEXI
S
PEECH
speed.
The message number is defined in bits 0-6 and can be
from 0 to 127. The F
LEXI
S
PEECH
speed is defined in
bits
7-9.
To play a message at normal speed, the FLEXI
speed should be “000”. Other playback speeds, from 0.5
to 2.0 (50% - 200%) of the normal speed can be selected
according to the following table:
FLEXI SPEED
SPEED
PLAYBACK
1.0
0.5
0.7
1.0
1.3
1.5
1.75
2.0
OF
Bit 9
0
0
0
0
1
1
1
1
Bit 8
0
0
1
1
0
0
1
1
Bit 7
0
1
0
1
0
1
0
1
The second playback command instructs the D6571E to
play back the message from the predefined offset
location. This offset information is defined in units of
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