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?
Any suggestions for other editing software i could try?
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
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
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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.
Confirmed problem is due to audacity. (v1.3.13)
Also occurs with HPF and normalization processes with this version
Also occurs with HPF and normalization processes with this version
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