D. You have a singer and a saxophonist. Both musicians create a sound at the "natural resistance" of their instrument. (Not forced, not held back) How can we measure the difference in amplitude between the two performers? What is the difference and what tools did you use to measure your results?

a) You can measure the difference in amplitude between the two performers by using a SOUND LEVEL METER a.k.a. Decibel Meter. It is a tool used to measure the amplitude of a given sound. It measures the sound using decibels. WE went into a soundproof/practice room. Lia played b flat concert on the soprano saxophone. On the A weighting (filter for frequencies 500 Hz), the amplitude was 88 dB. Keith sang b flat concert on A weighting at 81 dB. We repeated the process on the C weighting (filter for frequencies 32 Hz and lower). The amplitude of the saxophone was 84 dB and the amplitude of Keith's AMAZING voice was also 84 db. VAT?!?!??!?!? SAME NOTE... SAME SOUND?
- The soprano saxophone had a naturally louder sound because it is an amplifier because of all its keys, openings, and overall its shape/length.

- We measured the amplitude of the Dance studio and the teach lab's projector (fan). On the A weighting, the dance studio had an amplitude of 79 dB. The projector had an amplitude of 56 dB. On the C weighting, the Dance studio had an amplitude of 88 dB and the projector had an amplitude of 60 dB.

Measuring a constant sound while adding distance
- doubling the distance....the amplitude of the constant sound drops 6 dB. Decrease of sound with distance!!!!

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The U setting on some sound level meters! They measure lower frequencies that can't be heard by humans. For example they can measure whale frequencies!

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NOTES

-compression (+) crest of wave, refraction (-) trough of wave
frequency- 565/ dimension (length) of the room
null- silence

http://bbamusic.wikispaces.com/Sound+Review

HOME FILTERING
- The process of eliminating sound reflections that produce different lengths of frequencies. The sound is altered and unpleasant sounding; there are a lot of peaks and nulls in the sound. There are many ways to distribute the sound equally with better frequencies by using absorption and diffusing.
PRACTICE ROOM 3
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Headphones vs. Near field monitors

- Biophonic curve used as a guideline
- Can't hear the deep bass in headphones (lack of physical sensation), headphones are brighter sounding.
- brighter sounding because the air strips the higher frequencies from speakers before they reach the ear.
- headphones direct sound straight to the ear drum

BABYLON SISTERS PROJECT
drums
kickdrums
snare
ride symbol
crash symbol
highhat
bass
electric piano
synth
another synth
triangle
3 saxophones
alto, baritone. and tenor
lead vocal!
rhythm guitars
guitar
SINGERS! 3 of them?
windchimes
trumpet with mute
flugelhorn
base clarinet

QUESTIONS I DON'T KNOW
- comb filtering: waves out of phase with each other
- energy that takes to make a sound is measured in watts
-saw has more bite...saw tooth has all harmonics sine has none...has the fundamentals , square has every other ones, triangle tapers off much greater, voice is complex wave (most sounds)
- 20 Hz- 120 kHz
-wavelength (how do u measure)
- standing wave...cancel or boost sounds... measure room get the modes -- half the speed of sound gives u the frequency....multiply by harmonics
- 10 times to perceive double the sound
- the fundamental perceived pitch
- harmonic series
- two parallel surfaces (clap echo)
-