Voice Recognize ： Amazon, Google, Microsoft

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Okay這就是所謂的其實也沒什麼技術可言的較細部技術比較的整理文。裡面有大量爬日本人技術文的比較結果。日本不愧是日本，文章風格跟別的國家比起來秉持著一貫的細心，什麼問題都想到了..果然是萬物都能寫成攻略的國家阿！看完他們的比較都覺得沒什麼好寫的了lol
這篇只比較了傳統Brand比較響亮的幾家，其實多研究了一下還是有其他語音服務做得滿好的公司，若改天有整理到再來更新罷。

IBM

從缺

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Amazon - AWS _{Alexa Service}

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pros

• can do search
• can play music
• can using music service directly
• can set up genearl daily task
• API opend

cons

• Amazon hardware device needed
• upload source to AWS platform
• need to enable skill on another portable device first, like cell phone
• no conversation
• free license 1 year limited

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Microsoft _Azure

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pros

• work on current device

cons

• Cognitives Service API key will be expired in few months
• can only recognize speaking content by ourself need to design user pattern

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Google _{Voice SpeechRecognizer / Interaction API / Cloud Speech API}

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SpeechRecognizer and RecognitionListener

Android API
Intro date: Long time ago (API 8)
單句語音辨識成文字
2 result receive type are available: on time(onPartialResults) / Not on time(onResults)
Sample Here Sample in Chinese Analysis fr China

pros

• Android built-in API, should be work on current device
• looks possible to listening to user ALL THE TIME by implement to Service class.
• over 50 languages
• onPartialResults has better performance then before after Cloud Speech API had introduced to public. 原本的被說幾乎不能期待 [按]
• [Judge]:自己實際嘗試過後，結果依然很糟，依然是幾乎沒有作用。所幸「onResults」的速度還算快

cons

• can only recognize speaking content by ourself need to design user pattern
• onResults have to wait for more time after Cloud Speech API had introduced to public. [按]
• 連網後辨識能力較佳 [按]
• 時間超過就是辨識失敗
• not intended to be used for continuous recognition, which would consume a significant amount of battery and bandwidth.

Voice Interaction API

Android API
Intro date: 2015 Google I/O
連續聆聽的對話功能

pros

• can do all you can do by Google search bar
• can do conversation
• match with Android System well, easy for development
• has basic command pattern

cons

• Google App license needed
• only System built-in command are available for inner App

Cloud Speech API ^Beta

Google Cloud Platform API
Intro date: 2016
two mode: non-streaming / streaming (just like SpeechRecognizer)
using wave file if needed

pros

• 辨識度高（使用machine learning） [Youtube]
• over 80 languages
• allow noisy environment

cons

• 辨識時間時限(最多)1分鐘
• non-streaming mode 的結果取得需要等待
• 50 times for one day if free version (might be less then 50 times)

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