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Google Developer Day 2010 Japan: 音声入力 API for Android (アレックス グランスタイン, 小西 祐介)

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Voice Search アプリは Android 上での音声入力による Web 検索を可能にしました。さらに、このアプリが提供しているシンプルな API を利用することで、アプリ開発者は自分の Android アプリに、この音声認識機能を組み込むことができます。このセッションでは、音声認識技術の詳細を簡単にご紹介し、実際に Voice Search API を利用したアプリのデモ、コードの解説を行ないます。

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Google Developer Day 2010 Japan: 音声入力 API for Android (アレックス グランスタイン, 小西 祐介)

  1. 1. Revised v4Presenter Speech Input API For Android Alex Gruenstein
  2. 2. Outline •  Android built-in speech features •  Speech recognition primer •  How to: integrate speech input directly in your Android application
  3. 3. Voice Search •  Speak any Google search query •  Supported on Android, iPhone/ iPod/iPad, Blackberry, Nokia s60 •  15 Languages: • English (US, UK, Indian, Australian), Japanese, Mandarin, Korean, Taiwanese, French, Italian, German, Spanish, Russian, Polish, Czech •  Video
  4. 4. Voice Actions •  Beyond search •  Send text to Clare Homberlyn Hey are you coming home? •  Send e-mail I’m running late. •  Navigate to the Museum of Modern Art •  Listen to The Beatles •  Go to Wikipedia •  Video
  5. 5. Android Voice Input •  Speak anywhere you would normally type. •  Status updates, Twitter, SMS, Email, etc. •  Video
  6. 6. Revised v4Presenter Speech Recognition
  7. 7. Google’s Speech Recognizer Google speech server US English Acoustic Model Dictionary Search Language Model Dictation Language Model Japanese Acoustic Model Dictionary Search Language Model Dictation Language Model …
  8. 8. Layered Stochastic Models Audio -> phonetic units •  P(t1 -> “eh”) = .7 •  P(t1 -> “iy”) = .3 Words -> phonetic units •  P(read -> r eh d) = .6 •  P(read -> r iy d) = .4 Probability of word sequences •  P(“read a book”) > P(“read a flower”) Acoustic Model Dictionary Language Model t0 t1 …
  9. 9. Estimated with Data •  The language model is estimated using logs of billions of Google searches.Language Model
  10. 10. Estimated with Data •  The language model is estimated using logs of billions of Google searches. •  Counts of short sequences of words are used to estimate the probability of any sentence •  “san francisco golden gate bridge” -> •  “san francisco golden” •  “francisco golden gate” •  “golden gate bridge” •  Counting and probability smoothing requires many hours on thousands of computers! Language Model
  11. 11. Revised v4Presenter How to: Integrate speech input directly in your Android application
  12. 12. Android Speech Input API •  Android’s open platform makes it simple to access Google’s speech recognizer programmatically from your application. •  (Or any recognizer that registers for RecognizerIntent) •  Simple to use to the API to: •  Prompt the user to start speaking, •  Stream the audio Google’s servers, •  Retrieve the recognition hypothesis.
  13. 13. Example code // Called when someone clicks a button in your app public void onClick(View button) { // Create a recognition request Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH); // Set the language model intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM); // Send the request to display prompt, record audio, and return a result startActivityForResult(intent, 0); } // Called when speech recognition is finished protected void onActivityResult(int requestCode, int resultCode, Intent intent) { // Get the n-best list ArrayList<String> nbest = intent.getStringArrayListExtra( RecognizerIntent.EXTRA_RESULTS); // Do something with best result, e.g. “golden gate bridge” DoSomething(nbest.get(0)) }
  14. 14. Parameters •  Language (EXTRA_LANGUAGE), e.g. • ja_jp (Japanese) • en_us (US English) •  If not set, then the phone’s default language is used. •  Language Model hints (EXTRA_LANGUAGE_MODEL) •  Search – Good for short queries, business names, cities. The types of things people search for on Google. •  Free form – For dictation. Sending e-mail, SMS, etc.
  15. 15. Google Speech Technology •  More than just mobile phones… •  Automatic subtitles for YouTube videos •  Voicemail transcription for Google Voice •  1-800-GOOG-411: free telephone directory assistance
  16. 16. What’s next? •  Video •  http://www.google.co.jp/intl/ja/landing/animaru/

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