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HOW TO BEGIN RESTORING OLD RECORDS.

ADVANCED METHODS




Cue List 

R.I.A.A.  F.F.T.

Decrackling




CUE LIST

A Cue List function is integrated into Cool Edit 2000. It is very useful to cut up a long wav file into tracks.
Open a long file containing several songs.
Get to the cue list by :
     - View
     - Cue List

This Cue List (Ranges) window can be dragged around and allows one to manipulate the general graph without needing to be closed or reduced.

Cue List


Select the first song and click on " Add" (or press F8). The time range appears in the window. Select the second song and click on " Add" (or press F8). Continue in such a way as to select all the songs. While doing this one can listen to the music and zoom on the graph to make things easier.
Once finished, highlight all the ranges and click on "Batch".

The "Batch Process" window appears.

Batch Window


Select "Save to Files".
In the File Template type in "Track?"
Fill in the Starting Index.
Select your Destination Directory and click on OK.
Your tracks will be automatically recorded as separate wave files.


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R.I.A.A.  F.F.T.

If you don't dispose of an RIAA preamp, but you do have a high quality linear microphone preamp, you can manage to record an LP in a linear mode and then afterwards apply the RIAA correction by using a FFT filter.
Since the RIAA correction boosts the bass frequencies (up to 20 dB)and reduces the treble frequencies, it is absolutely necessary the record your music at minus 20dB or else the low frequencies will be saturated and distorted. This principle applies to any filter that uses boosting.

We include here under a text file showing the values used to make up a RIAA FFT Filter and a Anti RIAA filter

Item27=RIAA,3,30,0,97,32,97,188,96,330,95,541,91,696,87,855,83,1007,80,1128,76,1246,72,1375,68,1515,65,1656,
61,1819,57,2024,53,2281,50,2535,46,2738,42,2901,38,3041,35,3168,31,3286,27,3400,23,3509,20,3617,16,3723,12,
3827,8,3931,5,4035,1,4096,0,30,0,0,1,0,2,98,330,95,541,91,696,87,855,83,1007,80,1128,76,1246,72,
1375,68,1515,65,1656,61,1819,57,2024,53,2281,50,2535,46,2738,42,2901,38,3041,35,3168,
31,3286,27,3400,23,3509,20,3617,16,3723,12,3827,8,3931,5,4035,1,4096,0,2,1,4096,1,4,0,0,648,31,831,57,
1000,100,3,0,100,-20,20,16384,2,1,1,0,44100

Item41=ANTIRIAA,3,29,0,0,88,1,344,5,567,8,735,12,878,16,1009,20,1135,23,1259,27,1385,31,1517,35,
1660,38,1826,42,2029,46,2284,50,2537,53,2739,57,2902,61,3042,65,3169,68,3287,72,3401,76,3510,80,
3618,83,3724,87,3828,91,3932,95,4036,98,4096,100,30,0,0,87,0,88,1,344,5,567,8,735,12,878,16,1009,
20,1135,23,1259,27,1385,31,1517,35,1660,38,1826,42,2029,46,2284,50,2537,53,2739,57,2902,61,3042,65,3169,68,3287,
72,3401,76,3510,80,3618,83,3724,87,3828,91,3932,95,4036,98,4096,100,2,1,4096,1,4,0,0,648,31,831,57,
1000,100,3,0,100,-20,20,16384,2,1,1,0,44100


Download "Riaa.txt" HERE ( Right click & save)


How to use this text file ?

In Cool Edit's directory you will find a file named Cool.ini. ( Backup this file if you are not sure off what you are doing )
With a text editor (not a word processor) open Riaa.txt. Copy it to the clipboard.
With the same text editor open Cool.ini. Find the section [Filters96]. Paste riaa.txt at the end of the Filters96 section. Renumber the two new items so that they are in a direct ascending order ( Example : If the last item in your Cool.ini was number 19, the RIAA module becomes Item20, and the Anti RIAA module becomes Item21.) Each module should hold on one line. Then save Cool.ini

R.I.A.A. ANTI R.I.A.A.
RIAA ANTI RIAA


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DECRACKLING

This method reduces the light crackling and low level surface noise found on LP's.
It is due to the work of Mr Younglove which was an active member on the Syntrillium Forum which could be found here :

http://forums.syntrillium.com

The idea is to collect the crackle only and to subtract it from the original file. It does not affect big clicks and pops, but makes the music "ring very clean".
There are 6 steps. For a beginning I'd advise you to save each step into a file. This will enable you to undo any mistake that could be made. Later you can be more direct.

Step 1      Collecting a surface noise file.
We are going to collect into one file all the gaps without music found on the LP's side. Select the pregap before the first piece of music. Save into a file called Gaps.wav. Close Gaps.wav. Select the gap between the first and second piece of music. Copy it to the clipboard Open Gaps.wav. Goto to the end of the file, and paste. Save Gaps.wav. Close Gaps.wav. Select the gap between the second and third piece. Copy it. Open Gaps.wav. Goto the end of the file. Paste and save Gaps.wav. Close   ... etc ...   till you get to the end of the original file, where you will collect the ending bit of "silence". ( Do NOT include the stylus's thump when it lands on the record. Do NOT include anything which is not surface noise or general crackle.)
On a 20 minute Lp side containing 6 songs, you should be able to make a gap file lasting about 25 seconds.
There are other ways of doing this, but it is quite simple and understandable.

Step 2      Getting a noise sample.
Get a noise sample over the Gaps.wav file by :
     - Transform
     - Noise reduction
     - Noise reduction

     - Snapshots in profile = 400
     - Noise reduction Level = 100
     - FFT size = 8192
     - Reduce by = 40 dB
     - Precision Factor = 20
     - Smoothing amount =1
     - Transition Width = 0 dB

     - Get Profile from Selection
  ( The whole file must be selected )
     - Save Profile  ( Call it "Noise.fft" )

Noise reduction


Step 3      Getting the noise of the original file by :
Closing Gaps.wav
Opening the original file.
Performing a Noise reduction over this original file, using "Noise.fft"

     - Transform
     - Noise reduction
     - Noise reduction

     - Select Keep Only Noise
   ( Very Important )
     - OK

Save the file as "KeepNoise.wav". And copy it to the clipboard for later use in step 5
If you listen to this file, you wil find that it holds crackling and some music. Don't worry about this as we are not going to use the music data but only isolate the crackling.

Step 4     
Declick KeepNoise.wav with energetic settings. Don't worry about reducing any musical signal included in the file.
Save this declicked file as "NoiseDeclick.wav".
Keep this file open

Step 5        Isolate the crackle by :
     - Edit
     - Mix Paste

     - Volume =100     Invert Selected
     - Volume =100     Invert Selected
     - Lock Left/Right Selected
     - Overlap (Mix) Selected

     - From Clipboard Selected
  if "KeepNoise.wav" was put in the clipboard in step 3.
     - From File Selected then Select File    and find "KeepNoise.wav" in your directory.
     - OK

Mix Paste


Save as "Crackle.wav" and copy to the clipboard.
If you listen to this file you will only hear inverted crackle and noise.

Step 6        Last step :
Open The original file
     - Edit
     - Mix Paste

     - Volume =100     Invert NOT Selected
     - Volume =100     Invert NOT Selected
     - Lock Left/Right Selected
     - Overlap (Mix) Selected
     - From Clipboard Selected
     - OK

This will yield the final file which will have much, much less crackle and surface noise.
You may then declick and depop it in a classical way or manually if you want perfect results.
This file then can be used for any other transformations and cut up into tracks before final CDR burning.


Example


Before decrackling
(80 Koct.   mp3Pro)
After decrackling
(80 Koct.   mp3Pro)




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