Listening.
To a model, sound is an image made of frequencies. From there it can recognize noises, keywords and whole sentences.
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03.01
Sound becomes an image
15 min
Samples per second, waveform, spectrogram and mel scale. You see it live with the microphone. Live spectrogram
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03.02
Recognizing a sound
22 min
One-second windows and a small convolutional network. You teach the phone to tell three sounds apart. Lab, Sound input
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03.03
The word that wakes the phone
14 min
How a phone can always be listening without draining the battery. False alarms and missed words.
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03.04
From voice to text, and back
16 min
Transcription and speech synthesis on the device, from Whisper tiny to the live captions on your phone.
The course review → The key concepts and new questions, once you've finished the lessons.