Sound Tuning at College's Rooms


Kolej Komuniti Room  Acoustics Measurement

In the event of complete installed of a professional sound system,  the final step will be testing and commissioning. Testing involves ensuring  whole system run smoothly and commissioning includes sound tuning and report  submitting.replica hermes handbags

Room Acoustic Measurement  Methodology

  1. Set up the hardware shown in  Figure 1.

 
  Figure 1: Block Diagram of  Room Measurement Setup

  1. Use Smaartlive software in  computer to generate pink noise. This will send the pink noise to interface.  From interface, it will send pink noise back to the computer and to Kolej  Komuniti’s sound system.
  2. Pink noise will play from the  sound system and measured by microphone.
  3. Measured pink noise is send  back to computer through the interface.replica louis vuitton

Technical Terms
    Pink Noise
    Pink noise is a type of signal that contains all of the sound frequencies that fall within the range of a human being’s hearing — from  the lowest pitches that a person can hear to the highest tones.  In pink noise, each octave carries an equal amount of noise power.


  Figure  2: Pink Noise

Measurement
  Each spot within the room will be produced with 5 acoustic  measurements; Frequency Spectrum, Frequency Transfer Function (deciBel), Frequency  Transfer Function (phase), Frequency Spectro and SPL.

Frequency Spectrum
  The RTAs display in Frequency Spectrum, allows you to see the  amount of energy present in various frequency ranges, typically fractional  octave bands, across the audible spectrum. The RTA plot puts magnitude on the  (vertical) y-axis and frequency on the (horizontal) x-axis.

Frequency Transfer Function (decibel)
  A transfer function is a mathematical comparison of complex FFT  data from two signals — typically the input and output of a device or system.  SmaartLive uses this calculation to find how one signal differs from the  other. In Kolej Komuniti case, original pink noise and measured pink noise is  compared.

Frequency Transfer Function (phase)
  Phase display in Transfer Function mode shows the phase shift, or  time difference in the measurement signal relative to the reference signal  frequency by frequency.

Spectrograph
  Spectrograph, is a way of looking at changes in RTA  data over some period of time. The Spectrograph display plots time (in FFT  frames) on the x-axis and frequency on the y-axis with amplitude represented  by color. Spectrograph display is in terms of a common  real-time spectrum analyzer RTA). On a typical RTA display, magnitude values  for each fractional octave frequency band are indicated by vertical bars of  varying height. If, instead of rising to a different height, each frequency  band (or individual FFT bin) changed color to indicate higher or lower  magnitude, you would end up with a horizontal line made up of different colored  segments that showed the spectrum of a signal at a given moment. If you then  rotated that line 90°, you would have one vertical slice of a Spectrograph  display. Stack a number of these slices side by side and you would have a plot  that shows you how the spectrum of the input signal changed over some period of  time. The Spectrograph display effectively shows you three dimensional data  (time, frequency and energy) on a two dimensional plot with time on the axis,  frequency on the axis and magnitude represented by color.

SPL
  SPL History display which allows you to look at changes in  broadband signal level or Sound Pressure Level (SPL) over some period of time.  SPL is a broadband measurement encompassing all audible frequencies.


Room 1
  
  Figure 3: Room 1 Layout & Measurement Points
  Point P1
  
  Figure 4: Room 1 Point P1 Frequency Spectrum 
  
  Figure 5: Room 1 Point P1 Frequency Transfer Function (decibel)
  
  Figure 6: Room 1 Point P1 Frequency Transfer Function (Phase)
  
  
  Figure 7: Room 1 Point P1 Spectrograph


  Figure 8: Room 1 Point P1 SPL


Point P2
  
  Figure 9:  Room 1 Point P2  Frequency Spectrum
  

Figure 10: Room 1 Point P2 Frequency Transfer Function (decibel)
  
  Figure 11: Room 1 Point P2 Frequency Transfer Function (phase)


  
Figure 12: Room 1 Point P2 Spectrograph


  Figure 13: Room 1 point P2 SPL


Point P3
  
  Figure 14: Room 1 Point P3 Frequency Spectrum


  Figure 15: Room 1 Point P3 Frequency Transfer Function (deciBel)
  
  Figure 16: Room 1 Point P3 Frequency Transfer Function (phase)


  
Figure 17: Room 1 Point P3 Spectrograph


  Figure 18: Room 1 Point P3 SPL


Point P4
  
  Figure 19: Room 1 Point P4 Frequency Spectrum


  Figure 20: Room 1 Point P4 Transfer Function (decibel)
  
  Figure 21: Room 1 Point P4 Transfer Function (phase)
  
  
  Figure 22: Room 1 Point P4 Spectrograph
  
  Figure 23: Room 1 Point P4 SPL


Point P5
  
  Figure 24: Room 1 Point P5 Frequency Spectrum
  
  Figure 25: Room 1 Point P5 Frequency Transfer Function (decibel)
  
  Figure 26: Room 1 Point P5 Frequency Transfer Function (phase)


  
  Figure 27: Room 1 Point P5 Spectrograph
  
Figure 28: Room 1 Point P5 SPL


Room 2
  
  Figure 29: Room 2 Layout & Measurement Points

Point P1
  
  Figure 30: Room 2 Point P1 Frequency Spectrum
  
  Figure 31: Room 2 Point P1 Frequency Transfer Function (decibel)


  Figure 32: Room 2 Point P1 Frequency Transfer Function (phase)
  
  
  Figure 33: Room 2 Point P1 Spectrograph


  Figure 34: Room 2 Point P1 SPL


Point P2
  
  Figure 35: Room 2 Point P2 Frequency Spectrum
  
  Figure 36: Room 2 Point P2 Frequency Transfer Function (decibel)


  Figure 37: Room 2 Point P2 Frequency Transfer Function (phase)
  
  
  Figure 38: Room 2 Point P2 Spectrograph
  
  Figure 39: Room 2 Point P2 SPL


Point P3
  
  Figure 40: Room 2 Point P3 Frequency Spectrum
  
  Figure 41: Room 2 Point P3 Frequency Transfer Function (decibel)


  Figure 42: Room 2 Point P3 Frequency Transfer Function (phase)
  
  
  Figure 43: Room 2 Point P3 Spectrograph
  
  Figure 44: Room 2 Point P3 SPL


Point P4


  Figure 45: Room 2 Point P4 Frequency Spectrum
  
  Figure 46: Room 2 Point P4 Frequency Transfer Function (decibel)


  Figure 47: Room 2 Point P4 Frequency Transfer Function (phase)
  
  
  Figure 48: Room 2 Point P4 Spectrograph
  
  Figure 49: Room 2 Point P4 SPL


Point P5


  Figure 50: Room 2 Point P5 Frequency Spectrum
  
  Figure 51: Room 2 Point P5 Frequency Transfer Function (decibel)


  Figure 52: Room 2 Point P5 Frequency Transfer Function (phase)
  
  
  Figure 53: Room 2 Point P5 Spectrograph
  
  Figure 54: Room 2 Point P5 SPL


Point P6


  Figure 55: Room 2 Point P6 Frequency Spectrum


  Figure 56: Room 2 Point P6 Frequency Transfer Function (decibel)


  Figure 57: Room 2 Point P6 Frequency Transfer Function (phase)


   
Figure 57: Room 2 Point P6 Spectrograph


  Figure 58: Room 2 Point P6 SPL


Room 3


  Figure 59: Room 3 Layout & Measurement Points

Point P1
  
  Figure 60: Room 3 Point P1 Frequency Spectrum


  Figure 61: Room 3 Point P1 Frequency Transfer Function (decibel)


  Figure 62: Room 1 Point P1 Frequency Transfer Function (phase)


  
  Figure 63: Room 3 Point P1 Spectrograph
  
Figure 64: Room 3 Point P1 SPL


Point P2
  
  Figure 65: Room 3 Point P2 Frequency Spectrum


  Figure 66: Room 3 Point P2 Frequency Transfer Function (decibel)


  Figure 67: Room 3 Point P2 Frequency Transfer Function (phase)


  
Figure 68: Room 3 Point P2 Spectrograph


  Figure 69: Room 3 Point P2 SPL


Point P3
  
  Figure 70: Room 3 Point P3 Frequency Spectrum


  Figure 71: Room 3 Point P3 Frequency Transfer Function (decibel)


  Figure 72: Room 3 Point P3 Frequency Transfer Function (phase)


  
Figure 73: Room 3 Point P3 Spectrograph


  Figure 74: Room 3 Point P3 SPL


Point P4
  
  Figure 75: Room 3 Point P4 Frequency Spectrum


  Figure 76: Room 3 Point P4 Frequency Transfer Function (decibel)


  Figure 77: Room 3 Point P4 Frequency Transfer Function (phase)


  
Figure 78: Room 3 Point P4 Spectrograph


  Figure 79: Room 3 Point P4 SPL


Point P5
  
  Figure 80: Room 3 Point P5 Frequency Spectrum


  Figure 81: Room 3 Point P5 Frequency Transfer Function (decibel)


  Figure 82: Room 3 Point P5 Frequency Transfer Function (phase)


   
Figure 82: Room 3 Point P5 Spectrograph


  Figure 83: Room 3 Point P5 SPL


Room 4
  
  Figure 84: Room 4 Layout & Measurement Points
  Point P1
  
  Figure 85: Room 4 Point P1 Frequency Spectrum
  
  Figure 86: Room 4 Point P1 Frequency Transfer Function (decibel)


  Figure 87: Room 4 Point P1 Frequency Transfer Function (phase)


  
Figure 88: Room 4 Point P1 Spectrograph


  Figure 89: Room 4 Point P1 SPL


Point P2
  
  Figure 90: Room 4 Point P2 Frequency Spectrum


  Figure 91: Room 4 Point P2 Frequency Transfer Function (decibel)


  Figure 92: Room 4 Point P2 Frequency Transfer Function (phase)


  
Figure 93: Room 4 Point P2 Spectrograph


  Figure 94: Room 4 Point P2 SPL


Point P3
  
  Figure 95: Room 4 Point P3 Frequency Spectrum


  Figure 96: Room 4 Point P3 Frequency Transfer Function (decibel)


  Figure 97: Room 4 Point P3 Frequency Transfer Function (phase)


  
Figure 98: Room 4 Point P3 Spectrograph


  Figure 99: Room 4 Point P3 SPL


Point P4
  
  Figure 100: Room 4 Point P4 Frequency Spectrum


  Figure 101: Room 4 Point P4 Frequency Transfer Function (decibel)


  Figure 102: Room 4 Point P4 Frequency Transfer Function (phase)


  
Figure 103: Room 4 Point P4 Spectrograph


  Figure 104: Room 4 Point P4 SPL


Point P5
  
  Figure 105: Room 4 Point P5 Frequency Spectrum


  Figure 106: Room 4 Point P5 Frequency Transfer Function (decibel)


  Figure 107: Room 4 Point P5 Frequency Transfer Function (phase)


  
  Figure 108: Room 4 Point P5 Spectrograph


  Figure 109: Room 4 Point P5 SPL