Changes between Version 2 and Version 3 of BuildingCarrierWave


Ignore:
Timestamp:
11/27/12 09:51:47 (7 years ago)
Author:
sc
Comment:

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  • BuildingCarrierWave

    v2 v3  
    99[[Image(wiki:Attachments:build_carrier_wave-02.jpg)]] 
    1010 
    11  * Continue zooming 
     11 * Continue zooming until the region is clearly visible 
    1212[[Image(wiki:Attachments:build_carrier_wave-03.jpg)]] 
    1313 
    14  * T 
     14 * A careful visual examination reveals that a repeating signal is present 
     15 
     16 * Three pairs of two high spikes can be seen  
     17 
     18 * In this screenshot the repeating signal is highlighted, consisting pairs of high spikes, grouped into sets of three 
    1519[[Image(wiki:Attachments:build_carrier_wave-04.jpg)]] 
    1620 
     21 * The first set has been selected in Audacity 
    1722[[Image(wiki:Attachments:build_carrier_wave-05.jpg)]] 
    1823 
     24 * In order to build the carrier wave start with the longest continuous region of clear, repeating signals 
     25 
     26 * Expand the selection from the start of the first set to the start of last set of three pairs 
    1927[[Image(wiki:Attachments:build_carrier_wave-06.jpg)]] 
    2028 
     29 * Zoom to the maximum level of detail at the start of the selected zone 
     30 
     31 * In the following screenshot, the mouse button is being held down (turning the cursor into an arrow) 
     32 
     33 * The exact data point is being marked by the cursor 
     34 
     35 * Notice the time index at the top of the track editor is in alignment with the mouse cursor and that the "Selection Start" figure at the bottom of the track editor reads "00 h 00 m 33.984 s" 
     36 
     37 * This mark is high spike at the start of our signal 
     38 
     39 * Notice that the region of the track highlights to the left of the mouse cursor is actually some distance away from the mouse cursor. This behaviour seems somewhat odd, but can be ignored for the moment 
    2140[[Image(wiki:Attachments:build_carrier_wave-07.jpg)]] 
    2241 
     42 * Zoom and scroll to the end of the selected area 
     43 
     44 * Zoom back into the maximum resolution at the end of the selected area, as seen in the following screenshot 
     45 
     46 * Notice that once again the mouse button is being held down (turning the cursor into an arrow) over the exact data point which matches the first peak at the beginning of the next set of three pairs 
     47 
     48 * Again the time index at the top of the track editor is in alignment with the mouse cursor. The "Select End" figure at the bottom of the track editor reads "00 h 00 m 33.997 s" 
     49 
     50 * Audacity has also offset the region of the track highlight to the left of the mouse cursor, the same distance as seen in the previous screenshot. 
     51 
     52 * We now have selected a perfectly repeating wave, containing four complete copies of the carrier signal 
    2353[[Image(wiki:Attachments:build_carrier_wave-08.jpg)]] 
    2454 
     55 * Zoom back out in order to see the entire selected area 
     56 
     57 * Click the name of the track at the upper-lefthand corner of the track 
     58 
     59 * Select "Split Stereo to Mono" in order to separate the control signal (left channel, on the top) from the carrier wave (right channle, at the bottom) 
    2560[[Image(wiki:Attachments:build_carrier_wave-09.jpg)]] 
    2661 
     62 * We now have two Mono audio tracks 
    2763[[Image(wiki:Attachments:build_carrier_wave-10.jpg)]] 
    2864 
     65 * Delete the control signal (on the top) by clicking the "X" marker to the left of the track name 
     66 
     67 * Only the carrier signal remains 
     68 
     69 * Hit Ctrl-C to copy the selected region 
    2970[[Image(wiki:Attachments:build_carrier_wave-11.jpg)]] 
    3071 
     72 * Delete the carrier signal track 
    3173[[Image(wiki:Attachments:build_carrier_wave-12.jpg)]] 
    3274 
     75 * Hit Ctrl-X to paste only the selected region into the track editor 
    3376[[Image(wiki:Attachments:build_carrier_wave-13.jpg)]] 
    3477 
     78 * Zoom in to see the pasted signal 
     79 
     80 * Press Home to "Skip to Start" of the track 
    3581[[Image(wiki:Attachments:build_carrier_wave-14.jpg)]] 
    3682 
    37 [[Image(wiki:Attachments:build_carrier_wave-15.jpg)]] 
     83 * Press Ctrl-V to past another copy of the signal into the track editor 
    3884 
     85 * Press Home to return to the start of the track 
    3986[[Image(wiki:Attachments:build_carrier_wave-16.jpg)]] 
    4087 
     88 * Repeat this process, building a longer and longer track containing the carrier signal 
    4189[[Image(wiki:Attachments:build_carrier_wave-17.jpg)]] 
    4290 
     91 * By hovering the mouse cursor over the line segments and clicking the left button, the segments can be joined together into a single contiguous track 
    4392[[Image(wiki:Attachments:build_carrier_wave-18.jpg)]] 
    4493 
     94 * Continue this process until at least one second has been created 
    4595[[Image(wiki:Attachments:build_carrier_wave-19.jpg)]] 
    4696 
     97 * Copy the entire second and repeat the copy-and-paste procedure until building a carrier signal track of the desired length (in this case 10 seconds) 
    4798[[Image(wiki:Attachments:build_carrier_wave-20.jpg)]] 
    4899 
     100 * Join all segments until the entire track is complete 
    49101[[Image(wiki:Attachments:build_carrier_wave-21.jpg)]] 
    50102 
     103== Optional: Create a Stereo version of the Carrier Signal == 
     104 
     105 * Highlight the entire 10-second track and press Ctrl-C to copy it to the clipboard 
     106 
     107 * Click in the empty region of the track editor below the completed 10-second track 
     108 
     109 * Press Ctrl-V to paste a second copy of the carrier signal 
     110 
     111 * Click the track name and select "Make Stereo Track" 
     112 
     113 * Export the stereo track to a WAV file 
    51114[[Image(wiki:Attachments:build_carrier_wave-22.jpg)]]