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TDA7553 Datasheet(PDF) 8 Page - STMicroelectronics |
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TDA7553 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 12 page 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 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. Quasi-connected digit recognition Minimum pause between two numbers 150ms. Noise-robust recognition The recognition is still very robust even in high noisy environment (as automotive or industrial environments) Speaker-independent recognition Recognition is affected by selected language, no training is required Speaker-dependent recognition User words can be stored and mixed with speaker-independent words Training phase User words can be trained by repeating three times the selected word. Recognition is guaranteed when the same speaker is talking. Prompts Voice prompts can be stored on FLASH for creating a voice-based user interface Control through I 2C Management of the recognition engine, user words and voice prompts is accomplished through an I 2C protocol: the TDA7550 appears as a slave I 2C device. Many languages available 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. The external FLASH is used to store: ♦ Speaker Independent vocabulary (4 KB/word) ♦ User Words (4 KB/word) ♦ Voice prompts (11 KB/sec) Sample rate: 11.025 kHz Recognition rate: > 95% Maximum number of active words: 30 Maximum number of words: 450 Word memory requirements: 4 KB (speaker-independent) 4 KB (speaker-dependent) Prompt memory requirements: 11 KB/s audio amp spkr mic preamp T TD DA A7 75 55 50 0 F FL LA AS SH H b ba an nk k µC slave I 2C EMI ADC DAC Up to 4 MB service request Figure 1. TDA7550R - TDA7550 - TDA7551 - TDA7552 - TDA7553 8/12 |
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