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D6571E

EASYTAD™ Chip for an All- Digital Telephone Answering Machine with Flash Memory Interface

Unspecified 

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

11

SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490

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