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More Meaningful Jargon Or, All You Need to Know to Speak Like a Geek Sound .AIFF A udio I nterchange F ile F ormat A standard digital audio file on the Macintosh and some Windows computers. .MP3 A digital audio format popular on the Internet. .WAV

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slide2
.AIFF
  • Audio Interchange File Format
    • A standard digital audio file on the Macintosh and some Windows computers.
slide3
.MP3
  • A digital audio format popular on the Internet.
slide4
.WAV
  • A .WAV sound file is most often used on the Windows platform. It is also acceptable on the Macintosh. Therefore it is a good choice for cross-platform compatible sound files.
  • We will use .WAV files for some sounds on our multimedia projects.
quicktime sound only movie
QuickTime Sound-Only Movie
  • The QuickTime format, most often used for digital video, is also an efficient method of digitizing sound.
    • .MOV files.
compressed sound
Compressed Sound
  • A sound file that has been altered so that it requires less memory. Compressing a sound always reduces sound quality.
    • Generally, the higher the compression ratio, the lower the sound quality.
    • We will not be using compressed sounds in our multimedia project.
decibels db
Decibels (dB)
  • Units for measuring sound level differences.
sound quality
Sound Quality
  • Determined by
    • quality of source sound.
    • quality of analog capture device.
    • sampling rate when digitized.
    • sampling resolution when digitized.
    • compression ratio (if any) when digitized.
sampling rate
Sampling Rate
  • The number of sampling intervals per second used to capture a sound when it is digitized.
  • The higher the sampling rate, the higher the quality.
  • The computer (as well as audio CDs) are capable of sampling at 44,100 cycles a second.
dynamic range
Dynamic Range
  • Determined by the sampling resolution.
  • The difference between the loudest sound and the softest sound that can be recorded without distortion.
    • Eight-bit sounds have a dynamic range of 48 dB
    • 16-bit sounds have 96 dB.
    • Human hearing ranges from silence to 120 dB.
downsampled sound
Downsampled Sound
  • A sound that has been converted to a lower sampling rate.
  • Decreases the memory required to store the sound, but reduces sound quality.
waveform
Waveform
  • A graphic representation of a sound.
    • The height of the waveform represents the amplitude, or loudness.
amplify
Amplify
  • To adjust the strength or loudness of a sound.
wavelength period
Wavelength (period)
  • The distance between two successive peaks in a waveform.
    • The number of wavelength per second is the “frequency.”
frequency
Frequency
  • The number of wave peaks or cycles in one second.
  • Specified in hertz (Hz) or kilohertz (kHz).
  • Also know as “Pitch” when applied to our perception of sound.