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參數(shù)資料
| 型號： | 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)字電話應答機與快閃記憶體介面 |
| 文件頁數(shù)： | 11/117頁 |
| 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
11
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.
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
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.
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