skills: microphone position and adjustment concepts: clipping, dynamic range, sample frequency and...
Post on 19-Dec-2015
218 views
TRANSCRIPT
![Page 1: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/1.jpg)
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
![Page 2: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/2.jpg)
Where does this topic fit?
• Internet concepts– Applications– Technology– Implications
• Internet skills– Application development– Content creation– User skills
![Page 3: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/3.jpg)
Recording controls
Shift to append
![Page 4: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/4.jpg)
Waveform display
Microscopic zoom
![Page 5: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/5.jpg)
Which of these recordings is higher fidelity?
Explain your answer using the word “information.”
![Page 6: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/6.jpg)
Which recording requires more memory?
Explain your answer using the word “bit.”
![Page 7: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/7.jpg)
Higher fidelity → larger data files
![Page 8: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/8.jpg)
CD audio
• Sampling rate: 44.1 kHz
• Sample size: 16-bit
• Number of tracks: 2 (stereo)
![Page 9: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/9.jpg)
Microphone position
![Page 10: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/10.jpg)
Experiment with microphone settings and placement
The signal isclipped
The signal does not use the full dynamic range
Like Goldilocks said, just right
![Page 11: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/11.jpg)
Adjusting recording volume in Windows
Control panel > Sound > Record > Properties > Levels
mute
![Page 12: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/12.jpg)
You need a microphone
![Page 13: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/13.jpg)
Your first recording – Audacity help
Tutorial - your first recording
![Page 14: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/14.jpg)
Summary
![Page 15: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/15.jpg)
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?
![Page 16: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/16.jpg)
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/
![Page 17: Skills: microphone position and adjustment Concepts: clipping, dynamic range, sample frequency and size, amount of data and information captured, fidelity](https://reader030.vdocuments.site/reader030/viewer/2022032800/56649d2e5503460f94a04c64/html5/thumbnails/17.jpg)
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