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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. .

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Presentation Transcript
slide1

Audio recording

Skills: microphone position and adjustment

Concepts: 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.

where does this topic fit
Where does this topic fit?
  • Internet concepts
    • Applications
    • Technology
    • Implications
  • Internet skills
    • Application development
    • Content creation
    • User skills
slide3

Recording controls

Shift to append

slide4

Waveform display

Microscopic zoom

slide5

Which of these recordings is higher fidelity?

Explain your answer using the word “information.”

slide6

Which recording requires more memory?

Explain your answer using the word “bit.”

slide8

CD audio

  • Sampling rate: 44.1kHz
  • Sample size: 16-bit
  • Number of tracks: 2 (stereo)
slide10

Experiment with microphone settings and placement

Like Goldilocks said, just right

The signal is

clipped

The signal does not use the full dynamic range

slide11

Adjusting recording volume in Windows

mute

Control panel > Sound > Record > Properties > Levels

slide14

Self-study questions

Record something with the microphone volume set too highso clipping occurs. What does it sound like?

Record something in which you speak very quietly, then amplify it. How is the sound quality?

Record something at 8,000 Hz – how does the sound quality compare to a 44,100 Hz recording?

If you make a ten second recording at 8,000 Hz with 16 bit samples, how large will the file be?

If you make a 60 minute recording at 44,100 Hz with 32-bit samples, how large will the file be?

We said high fidelity recordings produce large files. What do we do to reduce the size of a file before we distribute it?

slide15

Resources

Audacity audio recorder and editor:

http://audacity.sourceforge.net/download/

Audacity audio recorder and editor, portable version:

http://portableapps.com/apps/music_video/audacity_portable

Audacity "how to" videos:

http://www.wonderhowto.com/search/audacity

LAME, an mp3 encoder for Audacity:

http://lame.buanzo.com.ar

FFMpeg, a WMA encoder for Audacity:

http://manual.audacityteam.org/index.php?title=FAQ:Installation_and_Plug-Ins#installffmpeg

Audacity keyboard shortcuts:

http://audacity.sourceforge.net/manual-1.2/keyboard_shortcuts.html

Audacity: how-to presentation:

http://pa.gigavox.com/shows/detail1595.html

Audacity Wiki:

http://audacityteam.org/wiki

Audacity threaded discussion forum:

http://audacityteam.org/forum

Audacity tutorial (on Mac, but good for Windows too):

http://homepage.mac.com/s_sloan/apsc_2007/audacity_jmc.pdf

Audacity del.icio.us:

http://del.icio.us/search/?fr=del_icio_us&p=audacity&type=all

Neil 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/

slide16

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