Audio Fundamentals Test 3 pt. 2

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Audio Fundamentals Test 3 pt. 2
2014-05-25 15:09:39
Audio Fundamentals
Interconnecting Spectrum Processors Dynamic Processors Time Processors
Show Answers:

  1. Where is mic level?
    • -60dB
    • 24 dBu
  2. Connecting from pro level (+4dBu) output to consumer level (-10dBV) input can lead to...
  3. +4 dBu = ____ volts
    -10 dBV = ____ volts
    • 1.23 volts
    • .32 volts
  4. What do bump boxes do?
    Match levels between consumer and professional gear or between balanced and unbalanced.
  5. Describe a balanced input/output.
    How many pins does a balanced input/output have vs an unbalanced one?
    • Has equal impedance on both conductors.
    • Balanced: 3
    • Unbalanced: 2
  6. Pro mic inputs are...
    Pro line level inputs are...
    Consumer audio gear is...
    • Balanced
    • Balanced or unbalanced
    • Unbalanced
  7. The standard microphone plug is...

  8. 1/4 inch (guitar Jacks)
    A _______ connector is mono balanced.
    A _______ connector is stereo unbalanced or mono balanced.
    • Tip sleeve (TS)
    • Tip ring sleeve (TRS)
  9. Tip sleeve (mono unbalanced)
  10. Tip ring sleeve (mono balanced or stereo unbalanced)
  11. The most common professional console patch bay cable used today:

  12. RCA
  13. What do spectrum processors do?
    Adjust the amplitude of the frequency spectrum and making out = input (EQ).
  14. Technical reasons for EQ: 
    -Compensating for frequency variations during recording, storage, transmission, and reproduction. -Reducing noise.

    Balancing a mix and adjusting the timbre.
  15. Low pass / High cut
  16. High pass / Low cut
  17. Bandpass
  18. Notch filter
  19. The cut-off frequency is...
    3 dB down from nominal level.

  20. What is bandwidth?
    “space” between cut off frequencies (subtract the low frequency cutoff from the high frequency cutoff). 

  21. Slope is measured in...
    6dB per octave
  22. What is shelving EQ?
    Increase or decrease a continuing amount of frequencies from a point.

  23. Peaking EQ
  24. Q =
    fc/Bw (center frequency / bandwidth)

  25. What is parametric EQ?
    Parametric Eq provides control over all three parameters: center frequency, boost/cut, Q or Bandwidth
  26. What are dynamic processors for?
    Dynamics processors all work on the dynamic range of an audio source (loudness/quietness).
  27. What are compressors?
    • amplifiers whose gain decreases as the input level increases.
    • output level remains constant regardless of the input level.
  28. What does unity gain mean?
    No change in amplitude.

  29. What is threshold?
    the input level at which the compressor turns on (gain is reduced).

  30. What is the compression ratio?
    the ratio of dB in to dB out (above the threshold). 

  31. Why do we need time processors?
    The advent of multitrack recording brought with it close micing and acoustically dead rooms necessitating the creation of artificial reverberation
  32. What is RT60?
    The decay time is the time it takes the reflected signal to reduce by 60 dB (RT60).
  33. What is an echo chamber?
    an acoustically isolated room with highly reflective wall coverings in which are placed speakers and microphones.
  34. What are reverb plates?
    • Echo Plates were metal sheets (plates) suspended on a frame an input transducer and 2 output transducers affixed directly to the sheet.
    • Vibrations would reflect off the edges of the sheet as sound would reflect off of walls.
    • They have a particular sound (not natural sounding)
  35. What is spring reverb?
    Spring reverb does not have an Early Sound Field and has a par/cular “twangy” sound.
  36. What are the three heads of analog tape machines?
    Erase, record, reproduce
  37. What is flanging?
    • Time delay with the creation of a shifting comb filter using a shifting time delay.
    • In flanging, the delayed signal is combined with the non-delayed signal to create constructive and destructive phase interference.
  38. What is chorus?
    Time delay that takes the original signal, doubles it, slightly pitch shifts it