“Noise suppressor for Voice”降噪后，人声闷得很不自然
我录制的素材带有背景噪声，用软件自带的“Noise suppressor for Voice”功能后，噪声确实减弱了，但人声变得特别浑浊，像是隔着厚布说话，完全没了原本的清晰感。作为新手，我既不知道该调哪个参数改善，也不敢随便动设置，生怕噪声没解决，人声反而更糟。
有没有新手能看懂的简单方法，调整“Noise suppressor for Voice”参数，兼顾降噪效果和人声清晰度？
针对我这个版本的滤波功能，Filter-width这类参数有没有适合人声降噪的具体数值参考？
除了上述两种方式，还有没有不用复杂插件的新手友好型降噪技巧？
能否推荐适合零基础的Kdenlive学习资源，比如入门电子书、官方简易手册之类的？
提前谢谢大家的帮助，不管是解决问题的技巧还是学习建议，对我来说都特别重要！
Help! Student New to Kdenlive 25.08.03 (Windows 11) - Muffled Vocals, Confusing Filter Params & Need Beginner Resources
Hello everyone! I’m a student using Kdenlive 25.08.03 on Windows 11. This is my first time using any audio editing or noise reduction tools, and I’m not only stuck with tricky noise reduction issues but also in urgent need of reliable learning methods. I’d really appreciate advice from experienced users here:
Vocals become unnaturally muffled after using “Noise suppressor for Voice”
My recorded material has background noise. After using the built-in “Noise suppressor for Voice” feature, the noise is indeed reduced, but the vocals have become extremely muddy—as if someone is speaking through a thick cloth—and completely lost their original clarity. As a beginner, I neither know which parameter to adjust to fix this nor dare to tweak the settings randomly. I’m afraid that instead of solving the problem, the vocals will get even worse.
Filter parameters don’t match AI suggestions, leaving a novice stuck
Later, I tried to use the filter tool for further optimization, but found that the only adjustable parameters in the software (such as Filter-width with only Hz and Q-factor as optional units) are completely inconsistent with those in the tutorials recommended by AI. Parameters like “noise reduction intensity” mentioned by the AI are nowhere to be found in my current version. Faced with these unfamiliar parameters, I’m worried about failing to filter out the noise and accidentally cutting off the vocal parts.
Urgently need Kdenlive learning resources for beginners
In addition, as a student who just started using this software, I want to systematically learn its editing functions. Are there any entry-level e-books or basic tutorials compatible with the current version? There’s too much messy information online, and I can’t tell which is suitable for beginners. I hope to find easy-to-understand learning materials to help me gradually master this software.
I sincerely hope to get your advice on these questions:
Is there a simple, beginner-friendly way to adjust the parameters of “Noise suppressor for Voice” to balance effective noise reduction and vocal clarity?
For the filter function of my version, are there specific value references for parameters like Filter-width that are suitable for vocal noise reduction?
Besides the two methods mentioned above, are there any other beginner-friendly noise reduction techniques that don’t require complex plugins?
Could you recommend Kdenlive learning resources for beginners, such as introductory e-books or official simplified manuals?
Thank you so much for your help in advance. Both problem-solving tips and learning advice will be extremely valuable to me!
Note: This post was translated by AI, and my native language is not English. Please feel free to ask if any part needs further clarification!
Search this forum for tips and tricks about using compressors on voice tracks. There are more available in Kdenlive that don’t say “voice” but work much better.
Don’t trust AI when it comes to video editing suggestions. If it refers to certain parameters that are not present in the Kdenlive effect, it is hallucinating or guessing. Kdenlive effects are what they are, they are not missing parameters AI tells you about.
Don’t be afraid! Kdenlive is a non-linear / non-destructive video editor, so feel free to adjust the parameters to your heart’s desire. If you don’t like an effect, you can always disable it or delete it, and it won’t degrade your original audio file.
Also, if you aren’t sure what an effect does, you can go to its entry in the manual directly from the editor:
The docs for this page are, unfortunately, not super helpful at the moment, but I found another web page which explains the parameters:
You can also read about the research behind the effect here (you’ll notice that the noise samples are also muffled):
My suggestion would be to use a completely different app called Audacity. I’ve been using its built-in voice suppression tool for years:
Export your audio from Audacity (make sure to give it a different name from the original file), and then go to Kdenlive and replace the audio in the Project Bin with the new one:
It’s also probably a context thing. RNNoise is the next evolution of the Speex Preprocessor, and was designed for low-latency, real time operation, with low operational complexity - ie. primarily to be used with Opus for VoIP, and suitable for use on embedded and mobile devices being used for live conversations and conferencing (there’s even a javascript implementation JM made for the demo page and as a proof for WebRTC use).
So people working in that space don’t usually need VAD (voice activity detection) explained, and they aren’t really ‘tuning’ parameters for changing how the output sounds, they’re ‘squelch’ controls for when to completely silence the audio because the algorithm thinks nobody is actually speaking and what is left is just all unwanted noise.
Optimising for that use case also means it had to tie its hands and not use powerful techniques that would increase latency. It can’t look at ‘future’ audio and use that to make decisions. So if you want a ‘real time’ effect that you can just apply and have work, while you scrub and edit, it will do that transparently. But if you want the highest quality post processing to clean up some piece of audio, that’s not going to happen in realtime, it will require pre-processing your audio as a whole, and may itself be an editing task, like colour correction, where the optimal fixes for each segment are hand tweaked to achieve exactly the look and sound you want to have in your final result.
And kdenlive isn’t really that sort of audio editor. At least not yet.
Thanks a lot for your quick and helpful reply! Your advice gave me great insights into audio editing, even though I eventually used DaVinci Resolve to fix the muffled vocals and noise issues for my project.
I really value your willingness to share knowledge with new users. Thank you again for your support!
