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PDF D6571E Data sheet ( Hoja de datos )
| Número de pieza | D6571E | |
| Descripción | Chip for an All-Digital Telephone Answering Machine with Flash Memory Interface | |
| Fabricantes | ETC | |
| Logotipo |  |
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D6571E Data Sheet
A
D6571E
EASYTAD™ Chip for an All-Digital
Telephone Answering Machine
with Flash Memory Interface
DS6571E.2
DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490
1
1 page  
D6571E Data Sheet
A
D6571E
EASYTAD™ Chip for an All-Digital
Telephone Answering Machine
with Flash Memory Interface
GENERAL DESCRIPTION
The D6571E chip is a digital speech/signal processing subsystem that implements all functions of TRUESPEECH® speech
compression and voice prompts, telephone line signal processing, flash memory management and True FULL Duplex
SpeakerPhone™ for an all digital answering machine. The D6571E is fully controlled by the system HOST through a
simple interface protocol. The HOST processor provides activation and control of all system functions such as speech
recording and playback, DTMF and call progress tone detection, DTMF and tone generation, and voice prompting.
The fully digital solution has no moving parts, yielding high reliability. The chip’s programmability enables a full range of
answering, recording and playback features for the end user. The D6571E is a single-chip, digital signal processor that
includes all of the necessary circuitry to interface with an external HOST, flash memory, and codec.
FEATURES
• Superior quality TRUESPEECH® Triple Rate Codertm
allowing selectable 11, 15 or 25 minutes of recording
time per each 4 Mbit Flash Memory
• PCM Recording
• Flexible storage of incoming messages (ICM),
outgoing messages (OGM). Supports multiple OGMs
and multiple mailboxes.
• TRUESPEECH®, natural-sound voice prompting, for
Day/Time stamp and voice instructions
• FLEXISPEECH™ variable speed, natural sound
playback (50% - 200%)
• DTMF generation and detection with near-end echo
cancellation for superior performance
• Extended DTMF detection (A, B, C, D)
• Automatic Gain Control
• True FULL Duplex SpeakerPhone™ with both
acoustical and near-end echo cancellation
• Caller ID and Call Waiting CID demodulation (both
Bell 202 and V.23)
• FSK modem for CID andα-5 support
• Supports 4 Mb or 16 Mb Flash Memory Devices
• Supports Time Stamp (message tag) modification
• Programmable DTMF, CPT, VOX, CAS, and FSK
Detectors Sensitivity
• Digital Volume Control
• µ-law and A-law codec support, selectable Master
and Slave mode, selectable sampling rate.
• General Purpose (CID) and Non-Erasable Storages
MIC
SPEAKER
TEL
LINE
SpeakerPhone
Codec
Codec
I/O Codec
HOST
Controlle
r
D6571E
DSP
Speech
Processor
Voice
Prompt
ROM **
16 Mbit
Flash
OR
4 Mbit
Flash
Voice Prompt
*
4 . . 16
Figure 1. D6571E Block Diagram
* Dashed lines indicate optional implementation
** Only supported with single 4Mbit Flash or no
All specifications are subject to change without prior notice
DS6571E.2
DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490
5
5 Page 
D6571E Data Sheet
Self Test and Initialization
The D6571E supports various functions responsible for
testing and initialization of the Flash memory, codec
interfaces, detectors, and other system configurations.
Reports
The D6571E is capable of reporting to the HOST the
status of the currently available Flash memory storage
space, as well as the overall status of the Flash memory
and the number of recorded messages.
Voice Prompt Generation
The D6571E implements high-quality Voice Prompt
playback, utilizing the built-in speech decoder. Some
portion of the Flash memory or an external ROM can
store the vocabulary. The D6571E supports up to four
64K byte sectors of voice prompts in flash memory or
one 64K byte external ROM or EPROM. Each 64K voice
prompt sector supports up to 128 phrases or utterances.
The D6571E receives the voice prompt sector number (if
more than one is used) and the phrase number from the
HOST, as part of the Voice Prompt command, and
outputs the appropriate speech segment via the CODEC
interface. The gap between two consecutive phrases is
controlled by the HOST and can be as low as 0. During
playback of the Voice Prompts, the D6571E monitors the
telephone line.
The configuration with external Voice Prompt ROM is
available if only one 4M flash or no flash is installed.
The Voice Prompts for the Flash memory may be built
with a Voice Prompt Workstation, which is available
through the DSP Group, Inc.
Near End Echo Cancellation
A near-end echo canceller is activated during Playback,
Tone Generation, and Voice Prompt Generation modes.
This echo canceller enhances the performance of the
DTMF and Call Progress Tone detectors in the presence
of near end echo from the hybrid.
near-end echo cancellation to the telephone line
connection. While in SpeakerPhone mode, the D6571E
can generate tones from the tone table and monitor line
for presence of DTMF, CPT, and CAS signals.
Unlike most SpeakerPhone implementations, the D6571E
implements a Full Duplex SpeakerPhone. In most
speakerphones, only one party can speak at the same
time, the other party is always muted, sometimes by as
much as 50 dB. This is Half Duplex SpeakerPhone
operation.
The D6571E allows true Full Duplex SpeakerPhone
operation. This implementation allows both parties to
speak at once and be heard by the party at the opposite
end of the call. The D6571E allows Full Duplex
SpeakerPhone operation due to the highly efficient
adaptive echo cancellation on both the acoustical and
electrical sides.
The D6571E supports DTMF, CAS, and CPT detection
during SpeakerPhone mode thus enabling such
functions as CID on Call Waiting, auto redial, and less
cost routing.
Power Down Mode
The D6571E will go into stop mode during power failure.
No battery backup is required to retain data in the case
of power failure.
Full Duplex Digital SpeakerPhone
The D6571E implements a True Full Duplex Digital
SpeakerPhone mode. In this mode the D6571E provides
adaptive acoustical echo cancellation between the
speaker and microphone connection as well as adaptive
DS6571E.2
DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490
11
11 Page | ||
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| PDF Descargar | [ Datasheet D6571E.PDF ] | |
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