TDA7553 Просмотр технического описания (PDF) - STMicroelectronics

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TDA7553

DIGITAL SIGNAL PROCESSING IC FOR SPEECH AND AUDIO APPLICATIONS

STMicroelectronics 

TDA7550R - TDA7550 - TDA7551 - TDA7552 - TDA7553

TDA7550

ASR311 Automatic Speech Recognition solution

The TDA-7550 is a single-chip solution for isolated word speech recognition, featuring the Lernout &

Hauspie ASR311 Automatic Speech Recognition engine.

Word base recognition

Isolated word recognition

Quasi-connected digit recognition

Noise-robust recognition

Speaker-independent recognition

Speaker-dependent recognition

Training phase

Prompts

Control through I2C

Many languages available

The external FLASH is used to store:

The words database is created from an extensive set of recordings,

with an equal distribution of speakers; the recordings are partially

taken in automotive conditions at low, medium and high speed.

Minimum pause between two numbers 150ms.

The recognition is still very robust even in high noisy environment (as

automotive or industrial environments)

Recognition is affected by selected language, no training is required

User words can be stored and mixed with speaker-independent words

User words can be trained by repeating three times the selected word.

Recognition is guaranteed when the same speaker is talking.

Voice prompts can be stored on FLASH for creating a voice-based

user interface

Management of the recognition engine, user words and voice prompts

is accomplished through an I2C protocol: the TDA7550 appears as a

slave I2C device.

Vocabularies in the following languages are available:

US English, French, German, Italian, Spanish, Japanese.

All the vocabularies have a common subset of about 150 words. Other

words and languages are available on request.

♦ Speaker Independent vocabulary (4 KB/word)

♦ User Words (4 KB/word)

♦ Voice prompts (11 KB/sec)

Sample rate:

Recognition rate:

Maximum number of active words:

Maximum number of words:

Word memory requirements:

Prompt memory requirements:

11.025 kHz

> 95%

30

450

4 KB (speaker-independent)

4 KB (speaker-dependent)

11 KB/s

Figure 1.

mic preamp

audio amp

spkr

µC

8/12

ADC

slave I2C

service request

TDA7550

DAC

EMI

FLASH Up to

4 MB

bank

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