Apps, Algorithms and Abstractions: Decoding our Digital World.
summary
Covers how a phone sets up 15–16 channels per handset over a ~2600 MHz carrier using phase/amplitude modulation (QPSK → 16‑QAM) to pack 2–4 bits per symbol, how cell towers trade range for power, and how TCP/TLS sit atop unreliable IP. Shows memory evolution from UNIVAC mercury tubes to 15,000 RPM platters (≈300 Mbps reads) and floating‑gate flash, explains JPEG 8×8 DCT tiles and 73% lossy tricks, and how UTF‑8 variable‑length encoding avoids C nulls.
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chapters (15)
- 0:00Start
- 5:36Radio Broadcasting
- 6:29Three Fundamental Challenges We Had To Overcome with Radio
- 7:51Radio Is a One-Way Mechanism
- 8:39Time Division Duplexing
- 9:37Frequency Division Duplexing
- 14:00Frequency Modulation
- 15:07Phase Modulation
- 19:18Digital Audio Sampling
- 24:25Memory Banks
- 25:57Quantum Tunneling
- 29:05Bryce Bayer Matrix
- 33:01The Cosine Matrix
- 35:38Jpeg Zigzag Pattern
- 43:43Unicode Consortium
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