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Old 27th May 2013, 03:22 PM   #1
ctrlx is offline ctrlx  United Kingdom
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Default inserting audio silence into a track

I have used audacity and NCH wavepad to put a 2 second silence at the start of my audio files. However on playback it is not silent but a slight hiss is present, which i'm sure is not down to my systems noise, as I have a CD with test tones which also has a silent track on it - and it is.
Any suggestions for other editing software i could try?
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Old 27th May 2013, 04:07 PM   #2
jcx is online now jcx  United States
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do you have dither enabled? - noise shaped dither for 16/44 should give inaudible noise in any practical home listening scenario at normal listening levels
Audacity does do a simple frequency shaping of the additive dither but doesn't implement a good psychoacousitcally tuned shaped noise floor dither

any system will have a noise floor that you can turn up gain to unreasonable levels to hear - but you can't listen to music at those levels so it really isn't a good test

S/N numerical spec was gamed in some early some CD players - they have muting circuitry that detects "digital black" and shorts the output into a low R - much quieter than the player's DAC circuitry's electronic noise

many have come to see (hear) this output muting as artificial, pointless - since the noise floor with music playing is the only thing that really counts - and is almost always limited by the noise of the studio, microphones, electronics in the recording - few home listening rooms are as quiet as better pro recording studios too

Last edited by jcx; 27th May 2013 at 04:27 PM.
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Old 27th May 2013, 10:46 PM   #3
Pano is online now Pano  United States
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I've done this plenty of time with Goldwave and not noticed any hiss. Goldwave is free to try, check it out.
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Old 29th May 2013, 08:18 AM   #4
ctrlx is offline ctrlx  United Kingdom
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Confirmed problem is due to audacity. (v1.3.13)
Also occurs with HPF and normalization processes with this version
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Old 29th May 2013, 09:17 PM   #5
ctrlx is offline ctrlx  United Kingdom
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Originally Posted by jcx View Post
do you have dither enabled?
the default on audacity is 32bit processing with dithering on.
turning the dithering off results in no added noise to my tracks.
just need to decide weather is set processing to 32 or 16bit.
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