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TOPIC: Audio Distortion/Level Boosting

Re: Audio Distortion/Level Boosting 2 months ago #197408

  • donkpow
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hugly wrote:
I agree that if digital clipping is part of the original audio you can't get rid of it. However, Lightworks doesn't have the instruments to detect digital clipping.
The waveform indicates clipping. Also, the DAW will give indication when O db is exceeded. Actually, more often than not, the meters turn yellow as you approach 0 db. Anything in the red is going to clip.
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Re: Audio Distortion/Level Boosting 2 months ago #197410

  • hugly
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As I tried to show earlier, the waveform (the red dots) doesn't separate between a signal which exactly reaches full scale and clipping. From a practical point of view that isn't a big deal, but red doesn't indicate necessarily clipping.

Referring to the level meter characteristics and controls, I think you're aware that I've pointed out elsewhere in some detail what to change to make them fit for serious digital audio work.
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Last Edit: 2 months ago by hugly.

Re: Audio Distortion/Level Boosting 2 months ago #197416

  • donkpow
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The shape of the waveform indicates clipping when present. How can you not acknowledge that?
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Re: Audio Distortion/Level Boosting 2 months ago #197425

  • RWAV
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A clean zero dBFS 1000 Hz sine signal shows in the timeline like this:
Yes and No - depends on how much of the timeline one is displaying -

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and how much horizontal space one has -

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Wonder how Audacity would look if it was displaying 10 minutes of waveform on-screen??
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Last Edit: 2 months ago by RWAV.

Re: Audio Distortion/Level Boosting 2 months ago #197427

  • RWAV
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LW certainly does display waveform clipping -

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Re: Audio Distortion/Level Boosting 2 months ago #197438

donkpow wrote:
While your immediate concern may have been addressed, I am concerned about the heavy clipping presented in your screenshot. Unless that is what you want, it seems to me the part circled is too badly clipped. I don't see any open areas in the section. You may want to rework that area in your DAW, first by adjusting EQ then compressing the section. As it is you've plastered the time with a wall of sound. Probably distorted.

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It does look like a clipped waveform from zoomed out, but I can assure you it's not. It's been aggressively mixed/mastered right up to the 0dB mark, but it doesn't sound to have any distortion. At least nothing unintended.

For reference, this is the track in question: soundcloud.com/user-910809074/realization

Re: Audio Distortion/Level Boosting 2 months ago #197439

  • briandrys
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It appears to be going over 0dB on the LR meter on the right.

Re: Audio Distortion/Level Boosting 2 months ago #197441

It is yeah, but only because the pan controls are set to centre field instead of full left and right.

Re: Audio Distortion/Level Boosting 2 months ago #197445

  • hugly
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RWAV wrote:
Wonder how Audacity would look if it was displaying 10 minutes of waveform on-screen??

For my taste, the waveform looks nicer in Audacity. Give it a shot, it's free.
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Last Edit: 2 months ago by hugly.

Re: Audio Distortion/Level Boosting 2 months ago #197447

  • briandrys
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Ambientologist wrote:
It is yeah, but only because the pan controls are set to centre field instead of full left and right.


To be honest, I see little point in taking the audio tight up to 0 dB in digital, doing so in an analogue recording has a tradition because the tape can take the saturation and has a good sound.

Re: Audio Distortion/Level Boosting 2 months ago #197449

  • donkpow
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Thanks for sharing the audio on SoundCloud. Being a registered user of SoundCloud, I am able to download this piece @ 44.1 kHz, 32 bit floating point and have a look at it.
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Re: Audio Distortion/Level Boosting 2 months ago #197450

  • hugly
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Ambientologist wrote:
It is yeah, but only because the pan controls are set to centre field instead of full left and right.

I think that's the point.

Some background information: You'll hear this distortion with your clip also when playing it in the source viewer (the left viewer). That's because the default panning scheme for clips is centered. That's fine for mono, but not for most stereo recordings. Inserting a clip into the timeline overrides the mixer settings of the clip and applies the mixer settings of the timeline. On newly created timelines (Make.Sequence), the tracks are grouped to pairs and panning is set per track pair to fully/left right. The mixer settings for clips are accessible, basically, but only in Flexible layout, not in Fixed (as it stands now, V14.5).
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Re: Audio Distortion/Level Boosting 2 months ago #197471

  • RWAV
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For my taste, the waveform looks nicer in Audacity. Give it a shot, it's free.
Would but Audacity is short on picture editing capability - anyway this forum is about lW - not Audacity.

The mixer settings for clips are accessible, basically, but only in Flexible layout, not in Fixed

In any project - if one modifies new sequence settings in Flexible - nominate track count and check 'MakeStereoPairs' those settings are honoured in all projects for new sequences - both Flexible and Fixed.

Track panning for clips is available in Fixed edit mode - to the extent that make stereo pairs can be accessed for a clip - that setting then remains for both layouts.
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Last Edit: 2 months ago by RWAV.

Re: Audio Distortion/Level Boosting 2 months ago #197527

When you pan both channels to center you add them together. Adding two signals of equal amplitude means a +3Db increase in output level. Miximg by the meters and don't let anything exceed 0 level indication will prevent any clipping in Lightworks.
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Re: Audio Distortion/Level Boosting 2 months ago #197529

  • RWAV
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Yes - and to add - the required level reduction needs to be made at track level - not at L/R output. Doing the latter reduces the dynamic range of the output.

As an aside - in the post showing waveform display in multiple tracks - obviously the track names reflect the bit depth of each audio clip - LW re-samples all on-the-fly.
Didn't really expect to see this - but looking at the curve in the top track - 8 bits - LW is actually drawing a curve which, at least to some extent, reflects the quantisation steps in the file. Not too shabby for an NLE - and a significant confidence boost in relation to current LW audio handling.
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