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D6571E

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

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D6571E Data Sheet

Mic VOX Position (bit 4)

Defines position of the Mic VOX detector before the

volume compensater (default) or after the volume

compensater.

Line VOX Response (bits 1-0), Mic VOX Response

(bits 3-2)

Defines frequency response of the Line and Mic VOX

detectors (flat or high pass filter).

Mode = 100 (Tone Generation)

= 111:

Value (bits 5 -0)

Reserved

Defines the value of the parameter to be set. Speaker

Volume and Line Volume is equivalent to the

parameters defined by Set SpeakerPhone Parameters

command with the exception that this command extends

the range of these parameters from - 20 dB to + 20 dB.

The Loop Attenuation is the same as in the Set

SpeakerPhone Parameters command. R/T and T/R

ratios are the same as for the First SpeakerPhone

command with the exception that the range of control is

extended to 4.

In this mode, the D6571E will generate tones.

Tone Index (bits 4-0) and Tone Gain (bits 8-5)

Acoustical and Electrical Decoupling should be set by

Host according to the actual hardware design Those

parameters define the actual volume compensation that

will set by the D6571E.

Allows to generate 16 DTMF tones from the redefined

tone table. No user defined tones are available in the

SpeakerPhone mode. Even in case of “warm start”

DTMF will be generated according to the “cold start”

protocol in this mode. See the Tone Generation

command for usage and definitions.

To start generation the Host should send Tone

Generation command (Mode = 100). To stop generation

and return to SpeakerPhone, the HOST should send a

Second SpeakerPhone Command other than Tone

Generation (for example, Get Speaker Phone Status).

If the Speaker Volume is more than 0 dB the D6571E will

activate Speaker Volume Compensation. This

compensation will be active until AEC will be trained.

Then it will be deactivated. The amount of

compensation introduced by the D6571E is:

Speaker Volume Compensation = Speaker Volume -

Acoustical Decoupling.

The default value of the Acoustical Decoupling is 0 dB.

If this parameter is not set by Host the Speaker Volume

compensation = Speaker Volume.

Mode = 101 (SpeakerPhone Parameters 2)

The Set SpeakerPhone Parameters 2 Command (Mode

101) allows additional control over the range for the

Loop Attenuation, Speaker Volume, Line Volume, and

T/R and R/T ratios. If extended range is not a

requirement, the Set SpeakerPhone Parameters

Command (Mode 001) can be used rather than this

command. This command also introduces the

Acoustical Decoupling and Electrical Decoupling

parameters.

Parameter (bits 8-6):

set.

Defines the parameter to be

= 000:

= 001:

= 010:

= 011:

= 100:

= 101:

= 110:

Loop Attenuation

Speaker Volume

Acoustic Decoupling

Line Volume

Electrical Decoupling

T/R and R/T ratios

Reserved

Similarly if the Line Volume is more than 0 dB the

D6571E will activate Line Volume Compensation. This

compensation will be active until EEC will be trained.

Then it will be deactivated. The amount of

compensation introduced by the D6571E is:

Line Volume Compensation = Line Volume - Electrical

Decoupling.

The default value of the Acoustical Decoupling is 0 dB.

If this parameter is not set by Host the Speaker Volume

compensation = Speaker Volume.

Use of this parameters allows to reduce Volume

Compensation in the D6571E SpeakerPhone. Please,

note that Volume Compensation is valid only at the

beginning of the conversation when the echo cancellers

are not trained.

Control of Available Modes

The D6571E SpeakerPhone system actually contains

two digital echo cancellers: an adaptive acoustical

canceller (AEC) which cancels the acoustical echo

DS6571E.2

DSP GROUP, INC., 3120 SCOTT BOULEVARD

26

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

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