TDA7550 Datasheet, PDF (9/12 Pages) STMicroelectronics – DIGITAL SIGNAL PROCESSING IC FOR SPEECH AND AUDIO APPLICATIONS

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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
Enrollment phase
Verification phase
Control through I²C
Noise-robust recognition of isolated words
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.
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.
Management of the verification engine is accomplished through an I²C
protocol: the TDA7551 appears as a slave I²C device.
Sample rate:
Equal error rate:
8 kHz
> 94%
Figure 2.
mic preamp
audio amp (optional)
to external world
Controller
ADC
slave I²C
service request
TDA7551
spkr
DAC
EMI
FLASH
Up to
4 MB
bank
Pass-phrases can reside here
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