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#psychoacoustics

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01 ·Audio Codecs·★ MEMBER·10 min read MP3 and Psychoacoustics — The Science of Sounds You Cannot Hear MP3 does not throw away sounds that aren't there — it throws away sounds that are there and inaudible. This piece works through the three holes in human hearing (absolute threshold, simultaneous masking, temporal masking) down to the equations, then follows SMR into bit allocation, the encoder's two nested loops, and the bit reservoir. 02 ·Audio Codecs·★ MEMBER·8 min read Audio Compression from Scratch — The Art of Discarding What You Cannot Hear How does MP3 sound 'the same' at less than a tenth of the size? We build up audio codecs from zero — auditory masking, the MDCT, and bit allocation — and finish with when to reach for MP3, AAC, or Opus.