D6571E Ver la hoja de datos (PDF) - Unspecified
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D6571E Datasheet PDF : 117 Pages
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D6571E Data Sheet
FSK modem is supported as a submode of the Tone
Generation mode
7. Line Monitoring - The D6571E monitors the
telephone line for the presence of DTMF signals,
Call Progress Tones, CAS, and CID signals.*
8. Delete Message - The D6571E can erase any
selected Flash memory message entry whose
number is specified by the HOST from the message
directory. The D6571E is able to perform Garbage
Collection to free memory space by erasing sectors.
9. Set Current Time - The HOST sends the D6571E
the current time & date stamp and/or status
information to be attached to the next recorded
message.
10. Get Time Stamp - The D6571E returns to the
HOST the time & date stamp and/or any other
information associated with a specific Flash
memory message.
11. Get Available Record Time - The D6571E reports
the currently available Flash memory record time.
12. Self Test & Initialize Memory - The D6571E
performs Flash memory testing and mapping as well
as other initialization functions.
13. Voice Prompt Generation - The D6571E
implements a TRUESPEECH™ Voice Prompt
playback from Flash memory or the external
ROM/EPROM. The D6571E implements voice
prompt programming into Flash memory. *
14. SpeakerPhone - The D6571E implements a True
Full-Duplex SpeakerPhone algorithm. *
15. Re-Compression -- re-compresses recorded
messages to another compression rate.
16. Data Transfer Modes - The D6571E implements
various modes, which involve transmit/receive
voice data via HOST Data bus. These modes are
described in separate section “Data Transfer
Modes”.
*These modes require an Idle command to return to Idle
mode.
DESCRIPTION OF MODES OF OPERATION
Idle
This is polling mode in which the D6571E monitors the
D6571E-HOST interface for HOST commands.
Transition to any other mode must always be done
through t he Idle mode.
Record
When the HOST sends a Record command, the D6571E
performs speech compression and stores the message in
the Flash memory. If bit 6 (VOX) in the first Record
command is “0”, the D6571E starts recording
immediately after receiving the Record command. If
VOX bit is set to “1’, the D6571E starts recording after
detecting voice activity.
The TRUESPEECH compression algorithm, implemented
in the D6571E is HOST programmable and is able to
utilize three compression rates as well as “gap coding”.
Record mode (bits 7-9 of the first Record command) are
defined as follows:
000 - low bit rate
001 - middle bit rate
010 - high bit rate
011 - reserved
100 - PCM (µ-law or A-law)
When bit GAP (bit 4) is set to “1” gap coding will be
activated with any of the compression rate (gap coding
is not available in case of PCM recording).
The compression algorithm is defined by the first
Record command. It can be changed while in Record
mode.
While in this mode, the D6571E monitors the
communication port every frame for HOST commands.
If no new command is detected, the D6571E continues
recording. While in Record Mode, the D6571E monitors
the line. If an additional Record command is detected,
the D6571E returns the status word with VOX status (bit
6), memory status (bit 7), index of the DTMF and CAS
signal detected (bits 0-3, 5), and Call Progress Tone
presence (bit 4) to the HOST. See Line Monitor mode
for the respective indexes for DTMF tones. While in
Record mode, the Host may issue a Command to change
independently the DTMF, VOX, CPT, and CAS
Sensitivity or the Volume of the looped back signal
without interrupting this mode. The status word will
reflect the status for the Record mode. Therefore, line
monitoring will not be affected.
If an Idle command is detected, the D6571E stops
recording, updates the message directory, and returns
to Idle mode. The D6571E reports to the HOST by
DS6571E.2
DSP GROUP, INC., 3120 SCOTT BOULEVARD
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