Week 2

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DATA

1 hertz (hz) is one cycle per second. speed of sound is 343 meters per second at 20c. waves have peaks (positve, above atmospheric pessure, air compresses), troughs (negative, below atmospheric pessure, rarefaction, expands air), amplitude (volume) mesured in decibels (dB) (dB is a log value), frequency, time, unity gain (zero atmospheric pessure), wave lenght of 1hz is 343 meters long. sound expands omi directionally (360 degree sphere) from the sauce, it then bouces (reverberates) off the room and objects, our ears hear the sound sauce and the reverb.

human hearing is estimated to be 20hz to 20khz, the range is different for every person, our hearing deteriates over time as we get older.

Dynamic range is the extremitys of the high and low signal, Bob Katz master enginer stared a world wide campange to bring dynamic range back to music, noise floor is the unwanted noise ambent sound, anechoic chamber is a reverb and noise free room, headroom is the space far below peaking, John Beaulieu, sound war.

XLR was created to standardise connectivity of audio devices, XLR is a balnced, TS (Tip Sleeve) cables are unbalenced, balencd cables carry two identical signals with one single inverted polarity and any noise introduced along the cable is canceled by polarity inversion, tip is postive, ring is negative polartiy, sleeve is grounded.

Phasing is when multiple waves colide and effect each other, 2 waves in phase will double and two waves that are out of phase will cancel eachother out, anything can be out of phase from 1 to 179 degrees.

dBμ is dB power and is log^10 +3dBµ electric voltage (example in 2 identical channels of a mixer the voltage dBµ will be +3dBµ) its logarithmic (its exponential), dBSPL is decible sound presure level and is log^20 +6dBSPL acoustic energy (example two peakers will be +6dBSPL.

K metering.

home work get a track and duplicate it and look at the master and see if it increas my +6dB, dublicate and phaze invert, duplicate and move percentage out of phaze, comb filtering describe 1 - 5 millisecond, haas effect(precedence) perceive diference sounds.

XLR Cable

TS/TRS/ guitar cable

This image describes the difference between tube and transistors. Tubes tend to add a warmer sound to the audio and transistors add a colder sound to the audio. They do this by either adding even or odd harmonics to the audio. I knew that tubes sounded warmer but I didn't know that Transistors sounded colder.

This image is of the frequency response of a single tone going through an analog compressor, its pointing out that some of the electrical components in the compressor are adding additional harmonic frequencies even though the compressor is set to be flat settings.

This image describes the phase invert button on some mixers. The phase invert/revers button shifts the phase of the audio on that channel but 180 degrees.

This image is about how two audio signals that are 180 degrease will cancel each other out. This is known as destructive phase.

Starwars space battels should be silent
The speed of sound is different in different places depending on the air temperature.
pistol shrimp claw creates a shock wave that's as hot has the surface of the sun and travels at 62 mph
hyper hearing in new places, all animals do this

Sound 101 with Bill Nye

Reflection

What?

What activities have I completed this week?

This week I listened to the 20khz podcast on sound and watched two videos about audios phase and how signal processors effect sound.

So What?

So, what have I learned this week?

The speed of sound is different depending on the temperature and medium its going thought. The phase of two sound waves can either amplify or nullify each other.

Am I on the right track with this unit?

Yes I think so.

Now What?

Now what will I do to move forward?

Keep doing what i'm doing and doing the pre and post class work.

References

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