/stocksoundandelectronics
SOUND
audio is recorded version of the sound sound is audio traveling through the air sound is a form of audio but not all audio is sound
energy density of the sound if u are closed to the sound source the sphere is small but if u away is bigger so the ammount of the available energy is less. distance makes sound softer
microphone, electric signal, speakers between 2 magnets example. vacuumbetween, very strong magnetic field
you can use a large speaker as amircophone and the opposite
inside speakers there are built in a small and a big speaker or more) , a strong for bass but its not high frequency, the small is like tha microphone construction but is quick. for high frequencies
the human ear is most sensitive with children voices (evolution)
visual octave = 1 earing = 10 octaves
logarithmic
http://gcaudio.com/resources/howtos/loudness.html
types of mics= 1 dynamic mic (works as a dynamo)_ (coil in magnetic field) 2 ribbon mic 3 condensor mic (not magnetic field but electric field) (most common mics nowadays) 4 piezo (records sounds through the material and no the air)
with some maths mics can go directional
voltage and current
SIGNALSSsss microphones turn the sound int oelectronic signals
sending weak single to long cable is not good so we use amplifiers (wek signals, medium strength signals, strong signal) or preamplifiers inside the mics *preamflf are not always insidethe mics*\
poweramplifier
storing sound is not practical but storing signal it is
3 types of amplifires
1-voltage apmplifier
resistor=
noise floor
cable-not the same with wire cable is any combination of wires gia na min ehn apostasi ta wires bgike to shielded cable coaxial
xlr plug
storage of signals
KEYWORDS TO SEARCH microphone, condensor/capacitor, voltage and curent, electric charge, signal (balanced and unbalanced), xlr plugs, jack(trs) amplifier microphone types logarithmic scale, frequency(octaves) decibel signwave, FFT NYQUIST AND FOURIER (FOURIER TRASNPORT, FAST FOURITERTRNS FFFTW(FASTEST FAST FOURIER TRANSRORT IN WEST)
STORAGE
recordins is storing a signal for later
in the old days storage ws done in an analog way (rotating drum of wax, with a big trompet
how many numbers can u do with 8bit?256
during sampling
as microphone, with membrane vibrating and a nidle)
DIGITAL STORAGE
digitan info is just numbers
digital conversion of analog signal
the highest possible soundwave freequency u can represent digitaly is half of the soundwave
aliesync
DIGITAL AUDIO FORMATS RAW(WAV=microsfot, AIFF=apple, PCM, CDDA) COMPRESSED( lossless= FLAC, ALAC, ////loose=MP3 SIMENI MPEG1 LAYER 3, MP4( IT CAN BE MEPG2 OR AAC)
types of microphones dynamic, ribbon, condensor, piezo (for materials not for the air)
street recording
dynamic or consensor
video sound- ine pada 48
in 96 the sound quality is always better
interview talking is ok 48
the mechanical construction of the mic has influence on how its behaves and its charakteristics
recorder 
differrent microphones have different frequency response related to their membrane microphone is sensitive to all direkction (omnidirektional)
microphone charakteristics
-type(dynamic or condensor) (i diafora ine to condensor theli powersupply eno to alo oxi, eno gia to dynamic prepi na kliso to powersupplytu device mu) - frequency repsonse - "pattern" = sensitivity pattern (- omnidirektional -- or cardioid --supercardoid--hyper cardoid--shotgun
autolevel control
attenuation!!!
HEADROOM *zero--digital zero---distrution
soundrack pro
____ ELECTRONICS
http://www.mrstockinterfaces.com/groups/wiki/wiki/89c0b/Basic_Electronics.html
flow = curent pressure= voltage
2 wires to connect to piezo
circuits
normal transistor= current flow resistor fat transitro= voltage control transistor (the voltage on the gate affects )
piezo cristal has high resistance to low signals and low to high res
circuit=> RESISTORS , CAPACITOR, FET
RESISTORS
resistors offfer resistance to electronic current
CAPACITOR is used to decaple the signal (they can be used as filter, they allow dc signals not topass , low chaning not so much and hight chanign more) is a disconnection
if the thing is charged u can have a pressure diference without flow
BASIC ELECTRONICS
basicelektroniks working with electrons
electric charge, current , field
El.charge= the ammount of electrons involved measured in Coulomb (C). 1 Coulomb contains 6.022 ? 10 óôçí 23ç electrons.
Electric Current is the movement of an electric charge. Anytime electrons move, this is called current. Current is measured in Ampere (A) which is defined as Coulombs per second [ 1A = 1C / s ] .So; when 1C of electrons flow through a wire in 1 sec, the wire carries a current of 1 A. The maximum current a circuit can handle is determined (among other things) by the thickness of the wires.
Electric Field or Potential is the amount of Energy converted or transferred by the electrons moving.
Ìeasured in Volts (V). When 1C loses 1V of potential, 1 Joule of energy is released.
Like water flowing downhill under the influence of gravity, electrons will flow in the presence of an electric field (or by means of
certain chemical reactions..). The electrons themselves are negative particles, and so are repelled by the negative pole of the field,
and attracted by the positive pole of the field.
In an electric field, electrons will flow from - to +
Electric current is defined as flowing from + to -
Electric current is flowing in the opposite direction to the electrons that are causing the current in the first place!*