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Simple Speech Recognition

Simple Speech Recognition. Larry Rudolph. Speechbuilder +/-. Speechbuilder is a great tool, but Grammar is limited Forces use of “action” and “attribute” “Domain” has lots of components complicated compile of domain pieces -- vocabulary, natural language, scoring

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Simple Speech Recognition

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  1. Simple Speech Recognition • Larry Rudolph

  2. Speechbuilder +/- • Speechbuilder is a great tool, but • Grammar is limited • Forces use of “action” and “attribute” • “Domain” has lots of components • complicated compile of domain pieces -- vocabulary, natural language, scoring • Must start server with domain framework

  3. Simpler than S-Builder • Simple: • send audio to server • receive string in the domain • but what about domain? • open a connection with server w/ domain • stream audio over connection; get string when done

  4. Streaming Audio Speak (Capture) Send to server Recognize • Long process: • each step can be seconds. • Streaming can speed things up (a lot) return Process

  5. Streaming Audio Speak (Capture) • Start sending audio before user is done speaking • Start recognition before audio done arriving • Still must wait for return string Send to server Recognize return Process

  6. Streaming recognition • Recall, recognition proceedings in several stages: • waveform to phonemes • phonemes to words • words to sentences • Natural language filtering • Grammar Parse Much of this can be pipelined NL requires whole sentence

  7. Speed up process • Do not do natural language filtering • Do not do very limited vocabulary • (what should one do with extraneous words -- fastest is to recognize them since ignoring them slows down parsing)

  8. more speed • pipeline whole process. • what about grammar parse? • do a Virturbi search • get back confidence levels

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