Microsoft Cognitive Services
Note: Audio files must be in WAVE/WAV format (file extension must be '.wav') and no more than 10 seconds in length. The audio file must be encoded in PCM single channel (mono).The bit rate must be at least 64k, and the sample rate must be 16000Hz (16Khz). The max frequency cannot be more than 16000Hz. You can record using your microphone with a tool like Audacity.