Video and Audio Methods: Testing Phase
2/5/04
Audio Test on 2/5/04 Sony Digital Recorder and Lapel Microphone. I recorded myself working with some of the Vhs teachers. The microphone is omnidirectional, I was picking up a lot of background conversations. A normal teacher voice was picked up at 6 foot clearly as if they were right there. The VHS teacher I was working with, has a soft voice. His voice did come through clearly, too, at a range of 2 feet. My voice is clear.
Being that I was there it’s easy for me to put this recording data in context. Without such context, this data might be useless. This is why the video and this audio track might yield interesting data.
I could see it is difficult to match dialogues even with video there is a lot of background noise that is picked up. I should have tried different levels of microphone sensitivity. Especially with a teacher like Betsy, clarity is going to be important. A test with teachers in situ is necessary.
Downloading audio to wav files. The software is easy to use. Just click on the file and save as a wav file, 16bit monoaural. Stereo might be better, but not worth the extra file space. An audio file of 19 minutes and 20 seconds saved as a wav file of 25 MB. It took about 3 minutes to complete the save.
Extrapolations: Hour’s worth=75MB and 10 minutes to save. Each data collection session includes 2 to 3 hours of audio. That’s 150 to 225 MB plus 20 to 30 of downloading that info. For six teachers that 900MB to 1.35GB and 1.8hr to 3 hrs. For six weeks once per week, that’s 5.4GB to 8.1 GB just for audio. That’s a factor of 72.
For video that’s 3.6GB per hour times 72. For these sessions that 260GB! That’s just raw data files. Exported files might take up another 10GB? This part I haven’t tested. We’re looking at a minimum data storage of 300GB. (I was way wrong, 840GB for 60hrs of video)
Logistically, I can’t see being able to do one video session per teacher per week. We don’t have the (wo)manpower. Once every two weeks for two months, seems to me a more realistic timeline. This gives us some logistical flexibility. Lin and Xiao will definitely need to conduct at least two sessions per week throughout the course of the eight weeks. I plan on doing once per week, and doing all of the data storage and manipulation.
I took the time to try out very highly rated wav to mp3 converter. It took another 5 minutes of computer processing time and the mp3 file size is still 18MB for 20 minutes of voice. Definitely not worth it converting to mp3.
Audio Test on 2/5/04 Sony Digital Recorder and Lapel Microphone. I recorded myself working with some of the Vhs teachers. The microphone is omnidirectional, I was picking up a lot of background conversations. A normal teacher voice was picked up at 6 foot clearly as if they were right there. The VHS teacher I was working with, has a soft voice. His voice did come through clearly, too, at a range of 2 feet. My voice is clear.
Being that I was there it’s easy for me to put this recording data in context. Without such context, this data might be useless. This is why the video and this audio track might yield interesting data.
I could see it is difficult to match dialogues even with video there is a lot of background noise that is picked up. I should have tried different levels of microphone sensitivity. Especially with a teacher like Betsy, clarity is going to be important. A test with teachers in situ is necessary.
Downloading audio to wav files. The software is easy to use. Just click on the file and save as a wav file, 16bit monoaural. Stereo might be better, but not worth the extra file space. An audio file of 19 minutes and 20 seconds saved as a wav file of 25 MB. It took about 3 minutes to complete the save.
Extrapolations: Hour’s worth=75MB and 10 minutes to save. Each data collection session includes 2 to 3 hours of audio. That’s 150 to 225 MB plus 20 to 30 of downloading that info. For six teachers that 900MB to 1.35GB and 1.8hr to 3 hrs. For six weeks once per week, that’s 5.4GB to 8.1 GB just for audio. That’s a factor of 72.
For video that’s 3.6GB per hour times 72. For these sessions that 260GB! That’s just raw data files. Exported files might take up another 10GB? This part I haven’t tested. We’re looking at a minimum data storage of 300GB. (I was way wrong, 840GB for 60hrs of video)
Logistically, I can’t see being able to do one video session per teacher per week. We don’t have the (wo)manpower. Once every two weeks for two months, seems to me a more realistic timeline. This gives us some logistical flexibility. Lin and Xiao will definitely need to conduct at least two sessions per week throughout the course of the eight weeks. I plan on doing once per week, and doing all of the data storage and manipulation.
I took the time to try out very highly rated wav to mp3 converter. It took another 5 minutes of computer processing time and the mp3 file size is still 18MB for 20 minutes of voice. Definitely not worth it converting to mp3.
posted by John Baek @ 10:47 AM
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