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Reconhecimento de fala

Transcrever áudio falado em texto

Fala e músicaIniciante #27
entradaÁudioTexto

O texto completo é apresentado em inglês; o título e o resumo estão traduzidos.

O QUE ESTA CAPACIDADE SIGNIFICA

Takes an audio clip and outputs a written transcription, usually with timestamps and punctuation. It only turns sound into letters without interpreting it; it is the reverse direction of speech synthesis, and unlike video understanding it reads only the audio track. In multi-party recordings it must also separate speakers.

Como é feita tecnicamente

Early systems were hybrids of an acoustic model and a language model, decoding frame by frame with hidden Markov models and a pronunciation lexicon. End-to-end models map acoustic features straight to characters or subwords, and Whisper-style training on large weakly labelled multilingual data markedly improved robustness to noise and accents. Streaming recognition must emit text before the audio ends, forcing a trade-off between latency and accuracy.

Produtos representativos

6

Organizações relacionadas

Usos típicos

  • Automatic minutes for meetings and interviews
  • Subtitle generation and video transcription
  • Voice input and voice search
  • Quality inspection and analytics of support calls

Como avaliar se funciona bem

Word error rate
Substitutions, deletions and insertions over the truth length
Character error rate
Preferred for languages without spaces, such as Chinese
Real-time factor
Processing time over audio duration, showing whether it keeps up live

Limites e dificuldades

  • Overlapping speech and heavy background noise make the error rate jump; crosstalk is nearly unresolvable
  • Accents, dialects, jargon and rare proper nouns are the main sources of error
  • Timestamps and punctuation are unstable on long audio, and bad segmentation hurts downstream reading and search

Conceitos por trás