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Amazon Polly

  • Converts text in "life-like" speech
  • The products takes text in specific languages and outputs speech in that specific language. Polly does not do translation!
  • There 2 modes that Polly operates in:
    • Standard TTS:
      • Uses a concatenative architecture
      • Takes phonemes (smallest units of sound) to build patterns of speech
    • Neural TTS:
      • Takes phonemes, generate spectograms, it puts those spectograms through a vocoder form which gets the output audio
      • Much advanced way of generating human-like speech
  • Output formats: MP3, Ogg Vorbis, PCM
  • Polly is capable of using the Speech Synthesis Markup Language (SSML). This is a way we can provide additional control over how Polly generates speech. We can get Polly to emphasis certain part of the text or do certain pronunciation (whispering, Newscaster speaking style)