QUESTION: lzma2 halves the size

drowe67 / codec2

Open source speech codec designed for communications quality speech between 700 and 3200 bit/s. The main application is low bandwidth HF/VHF digital radio.

GNU Lesser General Public License v2.1

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QUESTION: lzma2 halves the size #35

Closed vertexgamer closed 11 months ago

vertexgamer commented 11 months ago

Is it normal for codec 2 outputs (encoded with 700C) to be so compressable? Even deflate has no issue achieving < 60% compression ratio 700C.zip

drowe67 commented 11 months ago

It's not something we've studied. The main use case is real time HF radio, where we can't observe long sequences of frames (like an entire file) together, as they need to be sent over the channel soon after they are compressed.