D6571E Ver la hoja de datos (PDF) - Unspecified
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D6571E Datasheet PDF : 117 Pages
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D6571E Data Sheet
In case of “cold start” the D6571E can generate silence
and 16 standard DTMF tones from the table below.
TONE
INDEX
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
10
DTMF CODE
No Tone
1
2
3
4
5
6
7
8
9
*
0
#
A
B
C
D
FREQ. 0
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
941
FREQ. 1
1209
1336
1477
1209
1336
1477
1209
1336
1477
1209
1336
1477
1633
1633
1633
1633
Note that tones A, B, C, D (entries D - 10) are available
in “cold start” but are not available by default in case of
“warm start.” Entries D - 10 should be programmed by
the user (User Defined tones) in case of “warm start.”
No User Defined Tones is available in case of “cold
start.”
New Tone Definition
tones from the Idle mode and the D6571E will return to
Idle mode after the four commands/status sequence.
The HOST can use the newly defined tone from the tone
table immediately after the definition.
FSK Modem
FSK modem is implemented as a submode of the Tone
Generation mode. This mode allows to transmit and
receive FSK data with 1200 baud rate. This mode is
compatible with the CID receiver as well as with α-5
function.
In this mode the D6571E receives byte stream from Host,
converts it to FSK bit stream, and generates it in frames.
The number of byte in the frame is specified by Host.
The D6571E generates “leading mark bits” prior to the
FSK frame. The D6571E generates start and stop bits
for each byte of data (RS-232 protocol). The number of
start and stop bits can be programmed by Host. After
the frame has been transmitted the D6571E generates
“trailing mark bits.” The number of “leading” and
“trailing” mark bits is host programmable.
After completion of frame generation the D6571E can go
to the FSK Receive mode without delay. In the FSK
Receive mode the D6571E can report to Host the number
of detected Channel Seizure bits and the number of
detected Mark bits. Sensitivity (rejection threshold) of
the FSK detector is host programmable (SelfTest and
Initialization command, Test mode = 0111, submode =
100).
The HOST can add tones to the table by sending the
first Tone Generation command with bit 11 = “1” and the
TONE INDEX in bits 4-0. The next three commands will
define the new tone (single or dual). The second
command defines “Tone 0” output gain in bits 0-3 and
“Tone 1” output gain in bits 4-7. Each tone can be
programmed from -24 dB (gain code 1111) to 6 dB (gain
code 0000) with resolution of 2 dB. The user defined
tones may be programmed once only. Those tones can
be programmed in case of “warm start” only.
The third and fourth commands define the Tone 0
frequency and Tone 1 frequency respectively by the
following expression:
Line Monitoring Mode
In this mode the D6571E monitors the telephone line for
the detection of a DTMF signal, CAS signal, and/or
existence of Call Progress Tones.
Caller Alert Signal (CAS) is a part of the Call Waiting
CID protocol. The same signal with the name Idle State
Tone Alert Signal is part of the V.23 protocol.
While in this mode, the D6571E is monitoring the
communication port every frame for a HOST command.
If no new command is detected, the D6571E continues
monitoring the line.
32767 * cos (2* π*fm/fs)
where: fm is the desired frequency and
fs is the sampling frequency (8000 Hz)
To define a single tone, either the third or fourth
command has to be 7FFFH. The HOST will define new
If an additional Line Monitoring command is detected,
the D6571E returns a status word to the HOST
containing the Call Progress Tone flag (bit 4), and the
index of the DTMF or CAS signal detected. The index is
defined as follows:
DS6571E.2
DSP GROUP, INC., 3120 SCOTT BOULEVARD
17
SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490
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