That's the idea: take telephone/voice @  what? 4kbps? -- it was

standard means between 300-3100Hz. often - sounds below 300Hz are now that filtered today.

record your voice at 8Khz sampling rate and then compress with speex various options and compare compressed and uncompressed.

as long as only speech is recorded, and not too high compression is selected, it tends to improve, not degrade quality esp. when recording is noisy.
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