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Graphic EQ. Week 2 PowerPoint. GRAPHIC EQ: Common type of EQ, has banks of SLIDERS to control specific FREQUENCIES Sliders can ADD or SUBTRACT dB Subtractive is usually better BANDS: Each specific frequency control CAR: May have as little as 2 bands (BASS and TREBLE)

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PowerPoint Slideshow about 'Graphic EQ' - arielle


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Presentation Transcript
graphic eq

Graphic EQ

Week 2 PowerPoint

what is graphic eq

GRAPHIC EQ: Common type of EQ, has banks of SLIDERS to control specific FREQUENCIES

  • Sliders can ADD or SUBTRACT dB
  • Subtractive is usually better
  • BANDS: Each specific frequency control
  • CAR: May have as little as 2 bands (BASS and TREBLE)
  • LIVE SOUND: 25 to 31 bands
What is Graphic EQ?
definitions

THIRD-OCTAVE EQ: Most amount of bands. Each is a third-octave from the next

  • 2/3 octave EQ: Second most bands.
  • Less precise, but more general control
  • Often used to eliminate FEEDBACK
Definitions
some history

Historically, the first use of slide controls in an equalizer was in the Langevin Model EQ-251A which featured two passive equalization sections, a bass shelving filter and a pass band filter.

  • Each filter had switchable frequencies and used a 15 position slide switch to adjust cut or boost. The first true graphic equalizer was the type 7080 developed by Art Davis\'s Cinema Engineering. It featured 6 bands with a boost or cut range of 8 dB. It used a slide switch to adjust each band in 1 dB steps.
  • Davis\'s second graphic equalizer was the Altec Lansing Model 9062A EQ. In 1967 Davis developed the first 1/3 octave variable notch filter set, the Altec-Lansing "Acousta-Voice" system.
Some History
concepts of eq

In software: NOTCH filtering is a narrow band to pinpoint frequencies

  • SUBTRACTIVE EQ: Why is that better?
  • Simple HI and LO pass: when are they used?
  • What is OVER and UNDERSHOOT?
  • Adjusting Q: What is it?
  • What is LINEAR-PHASE EQ: Phase shift introduced that is proportional to the frequency
Concepts of EQ
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