A C O U S T I C I N T R O

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  • 1. Broadcast Engineering and Acoustics INTRODUCTION ENGR. JOMER V. CATIPON [email_address] 0919-8718913
  • 2.
    • By the end of the discussion, the student should be able to:
    • Define acoustics and psychoacoustics.
    • Enumerate the four considerations (other than aethetics) in designing a space.
    • Explain the importance of acoustics in the design phase. Give four reasons.
    • Enumerate the three important considerations in the acoustic design.
  • 3.
    • WHAT IS ACOUSTICS?
    • Acoustics
    • is the science that deals with the quantifiable measure of the production, control, transmission and reception of sound.
    • Psychoacoustics
    • is the study of the way humans perceive sounds.
  • 4. IMPORTANCE OF ACOUSTICS
  • 5. CONSIDERATIONS IN THE DESIGN OF SPACE
  • 6. 1. HEALTH AND SAFETY
  • 7.  
  • 8. 2. PRODUCTIVITY
  • 9. 3. COMFORT
  • 10.  
  • 11. 4. FUNCTIONALITY
  • 12.  
  • 13.  
  • 14.  
  • 15. WHY ACOUSTICS MUST BE CONSIDERED IN THE DESIGN PHASE
  • 16.  
  • 17. CASE STUDY 1
  • 18. CASE STUDY 2
  • 19. CASE STUDY 3
  • 20.
    • THREE IMPORTANT CONSIDERATIONS IN ACOUSTIC DESIGN
    1. 2. 3.
  • 21.
    • 1. REVERBERATION
  • 22.
    • 2. REFLECTIONS
  • 23.
    • 3. ABSORPTION
  • 24.
    • Noise Reduction Coefficient (NRC):
    • The Noise Reduction Coefficient (NRC) is a single-number index for rating how absorptive a particular material is.
    • Although the standard is often abused, it is simply the average of the mid-frequency sound absorption coefficients (250, 500, 1000 and 2000 Hz rounded to the nearest 5%).
    • The NRC gives no information as to how absorptive a material is in the low and high frequencies, nor does it have anything to do with the material’s barrier effect (STC).
  • 25.  
  • 26.
    • Sound Transmission Class (STC) :
    • The Sound Transmission Class (STC) is a single-number rating of a material’s or assembly’s barrier effect.
    • Higher STC values are more efficient for reducing sound transmission.
    • For example, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall.
    • The rating assesses the airborne sound transmission performance at a range of frequencies from 125 Hertz to 4000 Hertz. This range is consistent with the frequency range of speech.
  • 27.
    • The STC rating does not assess the low frequency sound transfer.
    • Special consideration must be given to spaces where the noise transfer concern is other than speech, such as mechanical equipment or music.
    • Even with a high STC rating, any penetration, air-gap, or “flanking” path can seriously degrade the isolation quality of a wall.
    • Flanking paths are the means for sound to transfer from one space to another other than through the wall.
    • Sound can flank over, under, or around a wall. Sound can also travel through common ductwork, plumbing or corridors.
  • 28.  
  • 29.  
  • 30.
    • RECITATION:
    • … Answer Briefly
  • 31.
    • Define acoustics and psychoacoustics.
  • 32.
    • 2. Enumerate the four considerations (other than aesthetics) in designing a space.
  • 33.
    • 3. Explain the importance of acoustics in the design phase. Give four reasons.
  • 34.
    • 4. Enumerate the three important considerations in the acoustic design.
  • 35.
    • END