Recording Midterm Guide

# Recording Midterm Guide - Recording Midterm Guide Frequency...

• Test Prep
• 5

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Recording Midterm Guide Frequency Response- how a room will react to a sound being played- how it will cancel specific frequencies, etc. How Sound is affected when it hits a surface Reflections Early Reflections- first few reflected sounds heard by listener-provide cues for size of the room Reverberation- random reflections closely spaced that are perceived as a single decaying sound RT60 – time required for the SPL in an enclosed place to decrease 60dB -what factors effect it? RT60= 0.049V/ SA V= Volume of the room in ft^3 S= Surface area in ft^2 A= Average Absorption Coeff. For multiple surfaces- RT60+ .059V/(S1A1+S2A2, etc.) Absorbed- how well a certain material absorbs sound is known as the material’s Absorption Coefficient (A) A=la/lr Ia=sound level that is absorbed in dB Ir= sound level that is deflected in dB How does the amount of absorption vary with frequency? Low Frequency Absorption- not as well (@ 125Hz A=.2) Must be absorbed by large pliable materials (harder to do so because of longer wave lengths) High Frequency Absorption- well (@4000Hz A=.65) To absorb extra well use dense porous materials like cloth, fiberglass or carpeting Transmission Loss- how much dB a sound will lose when heard going through a material M=surface density of a barrier in lbs. per square foot. F=frequency in Hz. TL=14.5 log M f – 16 ½” glass M=7.5 1” wood M=2.4 -more loss at higher frequencies Standing Waves- sound wave that is reflected off parallel surfaces and travels back on itself (1130 ft./sec) The smaller the room, the higher the first frequency. Big problem in low frequencies, creates noticeable level changes around 19dB or more. Frequency= (# of nodes)(1130ft.)/(2L) L=Size of Room Flutter Echo- Parallel walls that allow a number of discrete echoes to be heard, reverb is not smooth in decay. Small rooms are hollow and large ones are unintelligible.

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Diffused Sound- Acoustic boundaries that reflect the sound in a number of directions, and stop standing waves and flutter echo Symmetrical Reflections- Most important in control room design Splayed Ceiling- how a control room should be set up, will angle reflections back into the control room. Main Speaker Signal Path Mains- Console EQ Amp Speakers Why is there an eq? To make it sound as accurate as possible, negating the effect of the room on the sound (it’s freq. response) What to listen for when checking out speakers/control room.
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• Summer '07
• Garver
• Decibel, Sound pressure, Microphone, input impedance Mic, Mic Line Loss

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