Post by founder on Jun 20, 2008 18:23:26 GMT -5
Audacity Example #3 Instructions.
TO OBTAIN THE EVP RECORDING
media.putfile.com/Audacity-3-Example
1. Click on the above link and let it play. It is only about 3 seconds long.
2. Open Audacity.
3. ClicK the RED ROUND BUTTON to begin recording.
4. Switch back to the link and hit the play button.
5. Switch back to Audacity and hit the BROWN SQUARE BUTTON, to stop the recording when the recording is finished.
6. Save the file as the Original and Save it again as your working file. Continue working with the working file.
TO MAKE A WORKING FILE
1. Hit Control-F to fit the recording into your window. (You may also go to VIEW- Fit in Window.
2. You will see a marker at the beginning and end of the recording. I have placed these here so we can work in the same time frame. Use the "I" Selection Tool and with a left mouse click, place it just to the immediate right of the left beginning marker. Drag it left and highlight. You should have highlighted from the marker to the beginning. Hit delete on your keyboard to remove unrecorded space.
3. Use the "I" tool on the control panel and and with a left mouse click, move it to the immediate left of the right marker. Left click the mouse to highlight the marker and swing it right to highlight to the end of the recording. Hit delete. Save the file as the WORKING file again. We will now be working very closely within the same time frame. You have removed everything but the EVP.
SETTING UP YOUR WORK AREA
4. Move your arrow to the bottom line of the frame the recording is in. With a left click of the mouse, drag it down to the brown slider bar. This gives you a larger visual area to work in.
AMPLIFY THE RECORDING
5. Choose "I" and move the arrow to the far left of the recording box. With a left mouse click, move it to the right to the end of the recording. You may have to use CONTROL-F to fit the recording back in to your window.
6. Click EFFECT- AMPLIFY. In the white box above the slider, type in the number "10". This will amplify the entire recording by 10dB. If this is too much for you, you may decrease the number or increase the number so it is clearer. Do not use the slider bar because this is cumbersome and difficult to control.
SPECTRUM VIEW
7. Switch to SPECTRUM VIEW. You do this by locating the file name on the left side of the screen about 1/4 of the way down. You will see an upside down triangle. This triangle opens the window to choose different viewS. Chose SPECTRUM.
HERTZ LEVEL (Frequency of the EVP)
You will now see on the left side of the Spectrum view a gray column with 10HZ at the bottom and 8K Hz at the top. This representS where the EVP is located in hertz (frequency). 1/2 way between the top and bottom of the column would be would be 4000 hertz (4Kz). Below the 4 Kz area you see that there is a concentration of blue and red. The blue ends about 1/3 the way up the hertz column so it would be around 2500-2700 Hz. The red line contains white areas which is the EVP. You can estimate this to be between 500-1000Hz. This is merely an estimate because there is no true scale.
TO ANALYZE THE EVP HERTZ LEVEL
8. In order to better estimate the EVP area in red, use the "I" tool to highlight the entire recording. You may need to hit CONTROL-F to fit the window into the screen again.
9. Use the "I" tool to highlight .2 through .4 seconds, which is on the scale at the top of the timing bar on the top of the Spectrum.
10. Click on ANALYZE - PLOT SPECTRUM and choose LOG FREQUENCY in one of the white boxes in the FREQUENCY ANALYSIS box (lower white box with pre-selects).
11. Locate the horizonal graph line at the -50 dB box and follow it from left to right. You will see a large peak which begins to move upward at the 346 dB mark and move down at the 1000 Hz mark. From our earlier visual analysis of the hertz column we know that the red area was approximately less than 2000 Hz and probably around 300-1000 hz. This is where the EVP is located. With our Frequency Analysis graph, we have a better understanding that the EVP is
contained in the areas of 346 Hz and 1000 hertz.
USING THE FFT FILTER TO REMOVE NOISE
We want to eliminate as much of the noise below 346 Hz and above 1000Hz as we can without altering the voice.
12. Close the Frequency Analysis box.
13. Highlight the entire recording by moving the arrow to the left side of the recording box and drag it to the right side with a left click of the mouse.
14. Hit CONTROL-F to fit the recording in your window again.
15. Click on EFFECTS- HIGH PASS FILTER. The high pass filter is the filter which cuts off lower frequencies. Low pass equals high frequency cut. High pass equals low frequency cut.
16. In the High pass filter box, type in 346. This cuts off unwanted frequencies below 346 hertz which we found on our graph. Hit OK and you will see the concentrated blue area below the red line fade out.
17. Click on EFFECT- LOW PASS FILTER. In the box, type in 1300. This is 300 hz more than the 1000 we saw on the Frequency Analysis but it gives us a little room to play with which is necessary with Audacity. The reason we use the LOW PASS FILTER twice is first to remove the heaviest concentration of noise below 346 Hz. The second use of the low pass filter removes some of the noise about 1000 Hz where it is less dense. You still may wish to repeat the LOW PASS with 1300 to remove more noise above the EVP level. Just be careful you don't start to change the timbre or quality of the voice because you won't see much of a
change on the screen.
TO AMPLIFY ONLY THE EVP AND REDUCE THE BACKGROUND NOISE WITH FFT
18. Click EFFECT- FFT. Check the CLEAR button to reset it to "0".
19. On the blue line you will see the number 500 Hz. 1/2 way between 0 and 5000 hz would be 2500 Hz. 1/2 way between 2500 and 0 Hz would be 1250 hz. Locate this area by starting at 5000 and dividing it in half visually. When you find the 1250 mark left click the arrow on the blue line. This places a "o" on the line which is an anchor point. Click on the "o" and raise the whole line to 6 dB. Place another "o" immediately to the right of the first "o" by left clicking the
arrow to the right of the first "o". Drag that anchor point to -12dB. Make sure the line goes straight down as you drag it. It is moveable.
20. You have now encapsulated the EVP at the 6 dB mark and lowered the volume of anything above 1200 hz. Click "OK." You should have lowered the background noise without disturbing the EVP voice.
NOISE REMOVAL
Noise Removal with Audacity can easily destroy an EVP so it should be used sparingly.
21. Make sure you are in SPECTRUM VIEW and use Control-F to fit the recording in the window.
22. Look at the gray bar above the recording. You will see 0.0,0.5, 1.0, 1.5,2.0 and 2.5. These are the second markers for the time. On each side of 1.0 you will see 4 little markers between 1.0 and the number to the left and to the right of it. Use "I" and highlight from .08 through 1.2. When this area is highlighted, you will see it is between suspected EVP sounds which are in white.
23. Go to EFFECT-NOISE REMOVAL-GET NOISE PROFILE. When you click on GET NOISE PROFILE, the box will disappear but it retains the captured profile.
25. Highlight the entire recording with the "I" tool.
26. Go to EFFECT-NOISE REMOVAL. Move the slider all the way to the left. Click REMOVE NOISE. You may adjust this slider to get the best effect for your EVP. Audacity begins to distort the voice heavily by using NOISE REMOVAL. Audacity's FFT file works on both frequency (hz) and decibels (dB) without specificity. It will remove anything inside the noise profile.
BOOST THE BASS EFFECT OF THE EVP.
Because Audacity removes the bass more heavily than the upper octave range, we need increase the volume of the bass.
27. Again highlight the entire recording with the "I" tool.
28. Go to EFFECTS-BOOST BASS. Move the slider all the way to the right.
It will only go to 1000 hz which is well within our EVP range for this particular recording. You can use less on your next EVP depending on where the EVP lies in the frequency range. You can raise the bass volume up to 36 dB but I would caution to use no more than 6dB at a time and you can repeat the procedure until you are satisfed.
LOWER THE VOCAL RANGE
Since Audacity removes much of the lower vocals, you may wish to lower the octave range of the EVP.
29. Highlight the entire file with the "I" tool. Use CONTROL-F to fit the recording into your window again if need be.
3O. Go to EFFECT- CHANGE PITCH. This procedure is based on a musical scale. The easiest way is to is to Go DOWN only 1/2 step at at time until the EVP is discernable to you. If you make more than one pass, remember that you are increasing on what you have already built. If you lowered it 1/2 step and if you again move down a whole step, you will have altered it by 1.5 steps instead of the one step you chose. Use 1/2 step at a time. When it is understandable to you, which may take several passes, you are finished.
32. Go to FILE-EXPORT AS WAVE and you are finished.
The first part should be very difficult to understand but you should pick up
"How are you." The first word it "Gary"
TO OBTAIN THE EVP RECORDING
media.putfile.com/Audacity-3-Example
1. Click on the above link and let it play. It is only about 3 seconds long.
2. Open Audacity.
3. ClicK the RED ROUND BUTTON to begin recording.
4. Switch back to the link and hit the play button.
5. Switch back to Audacity and hit the BROWN SQUARE BUTTON, to stop the recording when the recording is finished.
6. Save the file as the Original and Save it again as your working file. Continue working with the working file.
TO MAKE A WORKING FILE
1. Hit Control-F to fit the recording into your window. (You may also go to VIEW- Fit in Window.
2. You will see a marker at the beginning and end of the recording. I have placed these here so we can work in the same time frame. Use the "I" Selection Tool and with a left mouse click, place it just to the immediate right of the left beginning marker. Drag it left and highlight. You should have highlighted from the marker to the beginning. Hit delete on your keyboard to remove unrecorded space.
3. Use the "I" tool on the control panel and and with a left mouse click, move it to the immediate left of the right marker. Left click the mouse to highlight the marker and swing it right to highlight to the end of the recording. Hit delete. Save the file as the WORKING file again. We will now be working very closely within the same time frame. You have removed everything but the EVP.
SETTING UP YOUR WORK AREA
4. Move your arrow to the bottom line of the frame the recording is in. With a left click of the mouse, drag it down to the brown slider bar. This gives you a larger visual area to work in.
AMPLIFY THE RECORDING
5. Choose "I" and move the arrow to the far left of the recording box. With a left mouse click, move it to the right to the end of the recording. You may have to use CONTROL-F to fit the recording back in to your window.
6. Click EFFECT- AMPLIFY. In the white box above the slider, type in the number "10". This will amplify the entire recording by 10dB. If this is too much for you, you may decrease the number or increase the number so it is clearer. Do not use the slider bar because this is cumbersome and difficult to control.
SPECTRUM VIEW
7. Switch to SPECTRUM VIEW. You do this by locating the file name on the left side of the screen about 1/4 of the way down. You will see an upside down triangle. This triangle opens the window to choose different viewS. Chose SPECTRUM.
HERTZ LEVEL (Frequency of the EVP)
You will now see on the left side of the Spectrum view a gray column with 10HZ at the bottom and 8K Hz at the top. This representS where the EVP is located in hertz (frequency). 1/2 way between the top and bottom of the column would be would be 4000 hertz (4Kz). Below the 4 Kz area you see that there is a concentration of blue and red. The blue ends about 1/3 the way up the hertz column so it would be around 2500-2700 Hz. The red line contains white areas which is the EVP. You can estimate this to be between 500-1000Hz. This is merely an estimate because there is no true scale.
TO ANALYZE THE EVP HERTZ LEVEL
8. In order to better estimate the EVP area in red, use the "I" tool to highlight the entire recording. You may need to hit CONTROL-F to fit the window into the screen again.
9. Use the "I" tool to highlight .2 through .4 seconds, which is on the scale at the top of the timing bar on the top of the Spectrum.
10. Click on ANALYZE - PLOT SPECTRUM and choose LOG FREQUENCY in one of the white boxes in the FREQUENCY ANALYSIS box (lower white box with pre-selects).
11. Locate the horizonal graph line at the -50 dB box and follow it from left to right. You will see a large peak which begins to move upward at the 346 dB mark and move down at the 1000 Hz mark. From our earlier visual analysis of the hertz column we know that the red area was approximately less than 2000 Hz and probably around 300-1000 hz. This is where the EVP is located. With our Frequency Analysis graph, we have a better understanding that the EVP is
contained in the areas of 346 Hz and 1000 hertz.
USING THE FFT FILTER TO REMOVE NOISE
We want to eliminate as much of the noise below 346 Hz and above 1000Hz as we can without altering the voice.
12. Close the Frequency Analysis box.
13. Highlight the entire recording by moving the arrow to the left side of the recording box and drag it to the right side with a left click of the mouse.
14. Hit CONTROL-F to fit the recording in your window again.
15. Click on EFFECTS- HIGH PASS FILTER. The high pass filter is the filter which cuts off lower frequencies. Low pass equals high frequency cut. High pass equals low frequency cut.
16. In the High pass filter box, type in 346. This cuts off unwanted frequencies below 346 hertz which we found on our graph. Hit OK and you will see the concentrated blue area below the red line fade out.
17. Click on EFFECT- LOW PASS FILTER. In the box, type in 1300. This is 300 hz more than the 1000 we saw on the Frequency Analysis but it gives us a little room to play with which is necessary with Audacity. The reason we use the LOW PASS FILTER twice is first to remove the heaviest concentration of noise below 346 Hz. The second use of the low pass filter removes some of the noise about 1000 Hz where it is less dense. You still may wish to repeat the LOW PASS with 1300 to remove more noise above the EVP level. Just be careful you don't start to change the timbre or quality of the voice because you won't see much of a
change on the screen.
TO AMPLIFY ONLY THE EVP AND REDUCE THE BACKGROUND NOISE WITH FFT
18. Click EFFECT- FFT. Check the CLEAR button to reset it to "0".
19. On the blue line you will see the number 500 Hz. 1/2 way between 0 and 5000 hz would be 2500 Hz. 1/2 way between 2500 and 0 Hz would be 1250 hz. Locate this area by starting at 5000 and dividing it in half visually. When you find the 1250 mark left click the arrow on the blue line. This places a "o" on the line which is an anchor point. Click on the "o" and raise the whole line to 6 dB. Place another "o" immediately to the right of the first "o" by left clicking the
arrow to the right of the first "o". Drag that anchor point to -12dB. Make sure the line goes straight down as you drag it. It is moveable.
20. You have now encapsulated the EVP at the 6 dB mark and lowered the volume of anything above 1200 hz. Click "OK." You should have lowered the background noise without disturbing the EVP voice.
NOISE REMOVAL
Noise Removal with Audacity can easily destroy an EVP so it should be used sparingly.
21. Make sure you are in SPECTRUM VIEW and use Control-F to fit the recording in the window.
22. Look at the gray bar above the recording. You will see 0.0,0.5, 1.0, 1.5,2.0 and 2.5. These are the second markers for the time. On each side of 1.0 you will see 4 little markers between 1.0 and the number to the left and to the right of it. Use "I" and highlight from .08 through 1.2. When this area is highlighted, you will see it is between suspected EVP sounds which are in white.
23. Go to EFFECT-NOISE REMOVAL-GET NOISE PROFILE. When you click on GET NOISE PROFILE, the box will disappear but it retains the captured profile.
25. Highlight the entire recording with the "I" tool.
26. Go to EFFECT-NOISE REMOVAL. Move the slider all the way to the left. Click REMOVE NOISE. You may adjust this slider to get the best effect for your EVP. Audacity begins to distort the voice heavily by using NOISE REMOVAL. Audacity's FFT file works on both frequency (hz) and decibels (dB) without specificity. It will remove anything inside the noise profile.
BOOST THE BASS EFFECT OF THE EVP.
Because Audacity removes the bass more heavily than the upper octave range, we need increase the volume of the bass.
27. Again highlight the entire recording with the "I" tool.
28. Go to EFFECTS-BOOST BASS. Move the slider all the way to the right.
It will only go to 1000 hz which is well within our EVP range for this particular recording. You can use less on your next EVP depending on where the EVP lies in the frequency range. You can raise the bass volume up to 36 dB but I would caution to use no more than 6dB at a time and you can repeat the procedure until you are satisfed.
LOWER THE VOCAL RANGE
Since Audacity removes much of the lower vocals, you may wish to lower the octave range of the EVP.
29. Highlight the entire file with the "I" tool. Use CONTROL-F to fit the recording into your window again if need be.
3O. Go to EFFECT- CHANGE PITCH. This procedure is based on a musical scale. The easiest way is to is to Go DOWN only 1/2 step at at time until the EVP is discernable to you. If you make more than one pass, remember that you are increasing on what you have already built. If you lowered it 1/2 step and if you again move down a whole step, you will have altered it by 1.5 steps instead of the one step you chose. Use 1/2 step at a time. When it is understandable to you, which may take several passes, you are finished.
32. Go to FILE-EXPORT AS WAVE and you are finished.
The first part should be very difficult to understand but you should pick up
"How are you." The first word it "Gary"
