s kills : microphone position and adjustment
DESCRIPTION
Audio recording. S kills : microphone position and adjustment C oncepts : clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity. This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. . - PowerPoint PPT PresentationTRANSCRIPT
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Skills: microphone position and adjustmentConcepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.
Audio recording
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Where does this topic fit?
• Internet concepts– Applications– Technology– Implications
• Internet skills– Application development– Content creation– User skills
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Recording controls
Shift to append
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Waveform display
Microscopic zoom
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Which of these recordings is higher fidelity?
Explain your answer using the word “information.”
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Which recording requires more memory?
Explain your answer using the word “bit.”
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Higher fidelity → larger data files
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CD audio
• Sampling rate: 44.1 kHz
• Sample size: 16-bit
• Number of tracks: 2 (stereo)
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Microphone position
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Experiment with microphone settings and placement
The signal isclipped
The signal does not use the full dynamic range
Like Goldilocks said, just right
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Adjusting recording volume in Windows
Control panel > Sound > Record > Properties > Levels
mute
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You need a microphone
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Your first recording – Audacity help
Tutorial - your first recording
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Summary
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Self-study questions
1. Record something with the microphone volume set too high so clipping occurs. What does it sound like?
2. Record something in which you speak very quietly, then amplify it. How is the sound quality?
3. Record something at 8,000 Hz – how does the sound quality compare to a 44,100 Hz recording?
4. If you make a ten second recording at 8,000 Hz with 16 bit samples, how large will the file be?
5. If you make a 60 minute recording at 44,100 Hz with 32-bit samples, how large will the file be?
6. We said high fidelity recordings produce large files. What do we do to reduce the size of a file before we distribute it?
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ResourcesAudacity audio recorder and editor:http://audacity.sourceforge.net/download/Audacity audio recorder and editor, portable version:http://portableapps.com/apps/music_video/audacity_portableAudacity "how to" videos:http://www.wonderhowto.com/search/audacityLAME, an mp3 encoder for Audacity:http://lame.buanzo.com.arFFMpeg, a WMA encoder for Audacity:http://manual.audacityteam.org/index.php?title=FAQ:Installation_and_Plug-Ins#installffmpegAudacity keyboard shortcuts:http://audacity.sourceforge.net/manual-1.2/keyboard_shortcuts.htmlAudacity: how-to presentation:http://pa.gigavox.com/shows/detail1595.htmlAudacity Wiki:http://audacityteam.org/wikiAudacity threaded discussion forum:http://audacityteam.org/forumAudacity tutorial (on Mac, but good for Windows too):http://homepage.mac.com/s_sloan/apsc_2007/audacity_jmc.pdfAudacity del.icio.us:http://del.icio.us/search/?fr=del_icio_us&p=audacity&type=allNeil Young on the need for higher quality music audio:http://www.wired.com/gadgetlab/2012/02/why-neil-young-hates-mp3-and-what-you-can-do-about-it/
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Download lame.dll, an mp3 encoder for Audacity:http://lame1.buanzo.com.ar/Lame_v3.99.3_for_Windows.exe
LAME download manual page:http://manual.audacityteam.org/man/FAQ:Installation_and_Plug-Ins#How_do_I_download_and_install_the_LAME_MP3_encoder.3F
Home of the LAME project:http://lame.sourceforge.net/index.php
Why Mike Cheng started the LAME project:http://lame.sourceforge.net/rationale.php
FFMpeg, a WMA encoder for Audacity (to export .wav files):http://manual.audacityteam.org/index.php?title=FAQ:Installation_and_Plug-Ins#installffmpeg