The Great Search: NuvoTon audio record & playback chips
While doing a teardown of a toy cactus that mimics people (https://www.google.com/search?q=mimic+cactus) by recording & replaying the last few seconds of audio, we were reminded of ISD audio chips. These record-and-playback chips have been around for decades and are a favorite with makers and engineers who want to quickly add audio prompt playback without big processing capability. These chips don't require battery backup or a flash memory chip, they keep the audio clips stored internally in a compressed format. Originally these were popularized in use cases like "digital greeting cards" that…
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