Sixty-Four Thousand Bits, or Thirteen (Chapter 6)
from Between the Signs: The Speech Communication Podcast
How a phone call survives being squeezed, told as three ideas rather than a catalogue of codecs. Spend bits where they do the most good, which is why quantization steps are fine near zero and coarse further out. Do not send what the receiver could have guessed, and shape the unavoidable error so that it hides underneath the speech itself — masking, used as a design tool. And, at the extreme, stop sending the signal at all and send the recipe instead, at the price of a voice that is intelligible but no longer anyone in particular. The episode closes with the compromise that made mobile telephony possible, and with a warning about trusting the obvious quality metric. This episode was generated with artificial intelligence (NotebookLM) on the basis of the lecture script, and the voices are synthetic. In case of doubt, the lecture and the script are authoritative.
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