# ACX, then noise floor, and pauses greater than 0.5 seconds

**URL:** <https://forum.audacityteam.org/t/acx-then-noise-floor-and-pauses-greater-than-0-5-seconds/151203>\
**Category:** Audacity 3 Help Forum\
**Tags:** analyzers, audio-book, acx\
**Created:** [February 1, 2026, 1:08pm UTC](https://forum.audacityteam.org/t/acx-then-noise-floor-and-pauses-greater-than-0-5-seconds/151203 "2026-02-01T13:08:17Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Trebor](https://forum.audacityteam.org/user_avatar/forum.audacityteam.org/trebor/32/45854_2.png) [@Trebor](https://forum.audacityteam.org/u/Trebor)\
**Post date:** [February 1, 2026, 2:59pm UTC](https://forum.audacityteam.org/t/acx-then-noise-floor-and-pauses-greater-than-0-5-seconds/151203/5 "2026-02-01T14:59:01Z")

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> [@ProfoundP](#):
>
> Here’s a particularly breathy section,

IMO more like [excessive sibilance](https://en.wikipedia.org/wiki/De-essing), fixable with the [desibilator plugin](https://forum.audacityteam.org/t/updated-de-clicker-and-new-de-esser-for-speech/34283/199)

 ![image](https://forum.audacityteam.org/uploads/default/original/3X/c/8/c899dbffdc9e644b001c78b0c9268b6f265b0079.jpeg)

[/uploads/default/original/3X/d/c/dc906c6df6b90646963e30067a9296a08b1dcfd3.wav](https://forum.audacityteam.org/uploads/default/original/3X/d/c/dc906c6df6b90646963e30067a9296a08b1dcfd3.wav) “burSt” before -after desibilator.

BTW there is nothing above 8kHz. That could be due to zoom-type real-time processing, or a 16kHz sample-rate bottle-neck somewhere in your recording chain.

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