audio amp (optional)

spkr

mic preamp

T

1

F

H

b

k

Controller

EMI

Pass-phrases can reside here

to external world

slave I

ADC

DAC

Up to

4 MB

service request

Figure 2.

TDA7551

SV208 Speaker Verification solution

The TDA7551 is a single-chip solution for speaker verification, featuring the Lernout & Hauspie SV208

verification engine. Pass-phrases can be stored by performing an enrollment (the pass-phrase must be

repeated three times), then the incoming prompt can be compared with the pre-stored pass-phrase to

verify the speaker identity.

Known password speaker recognition

Noise-robust recognition of isolated words

Enrollment phase

The speaker associates his identity to an utterance, which must last

from 1 to 2 seconds, and reapeat it three times; the algorithm performs

an analysis and accepts or rejects the enrollment phase.

Verification phase

The claimed identity of the speaker is compared with the result of the

verification phase, in which the input prompt is compared with the

selected pass-phrase.

Control through I

Management of the verification engine is accomplished through an I

protocol: the TDA7551 appears as a slave I

Sample rate:

8 kHz

Equal error rate:

> 94%

TDA7550R - TDA7550 - TDA7551 - TDA7552 - TDA7553

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