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I'm a newbie in audio works, so please bear with me.. I've recorded a phone call (8000Hz, Mono, 16 bit, amr format) and I'm trying to improve it's quality but I can't understand why it sounds the same as when the loudspeaker reach 100% and distorts the sound.

May you help me to understand how is called this disturb and what's causing it?

https://sndup.net/96gx

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