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I have been working on some acoustic Edison Diamond Disc records and have noticed something "strange" to me.
After applying filters I usually place the entire song on the amplitude vs time display to look for "spikes" from scratches that are left over. Of course, you can look for the spikes before the filtering also.
I use the "gain normalize" function to have the big spikes show up since the spikes set how far the music's amplitude can be boosted and so after you use the gain normalize, the spikes are going to the top of the display.
Now, when I zoom in on the spikes I can clean up the signal using the "I" key to remove the impulse...BUT....sometimes, the spike turns out to be part of a real music note. What is different, is that the waveform is nice and smooth with JUST ONE CYCLE HIGH ? This one cycle causes a big spike upwards and then the rest of the waveform is back down.
What I do, is highlight the one spike in the waveform around the zero crossing and then press the I key. The spike is removed and the waveform then has a nice smooth shape. The gain/normalize function then increases the song and "life is good".
Where does the one cycle of extra high signal come from ????? The cycle is not a scratch because the scratches looks very much different from the normal song waveforms.
This "single cycle spike" seems to occur more often on acoustic waveforms than electric recordings.
Comments ?
Marc
I have been working on some acoustic Edison Diamond Disc records and have noticed something "strange" to me.
After applying filters I usually place the entire song on the amplitude vs time display to look for "spikes" from scratches that are left over. Of course, you can look for the spikes before the filtering also.
I use the "gain normalize" function to have the big spikes show up since the spikes set how far the music's amplitude can be boosted and so after you use the gain normalize, the spikes are going to the top of the display.
Now, when I zoom in on the spikes I can clean up the signal using the "I" key to remove the impulse...BUT....sometimes, the spike turns out to be part of a real music note. What is different, is that the waveform is nice and smooth with JUST ONE CYCLE HIGH ? This one cycle causes a big spike upwards and then the rest of the waveform is back down.
What I do, is highlight the one spike in the waveform around the zero crossing and then press the I key. The spike is removed and the waveform then has a nice smooth shape. The gain/normalize function then increases the song and "life is good".
Where does the one cycle of extra high signal come from ????? The cycle is not a scratch because the scratches looks very much different from the normal song waveforms.
This "single cycle spike" seems to occur more often on acoustic waveforms than electric recordings.
Comments ?
Marc
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