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Download Basics of Audio Systems Audio Basic Signal Path Signal
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Transcript
NYC College of Technology Dr. David B Smith Professor John Huntington ©2004, all rights reserved Audio ν The Electronic representation of Sound Basics of Audio Systems Basic Signal Path ν ν Signal Flow Charts Outputs always connect to: Inputs ν ν ν High level View 1 Sound Event Transduction Transducer Audio Equipment Transducer 2 3 4 5 Electrical information can now be modified. Modified Electrical information converted back to Acoustical energy. Sound Event Acoustical Energy converted to Electrical Energy Critical to design of systems Drawn by designer Used by crew to build system ν ν ν The conversion of one form of energy into another In our case, acoustical to electrical Or, electrical to acoustical 1 Signal ν ν ν ν ν Audio information Can be either analog or digital Analog is a voltage Must travel along circuitry at close to speed of light or be stored. Otherwise, information is lost. Signal Path ν The specific route that a signal travels through the possible circuits Voltage Time Gain ν ν ν Amplification factor of a circuit Expressed in power or voltage Every circuit has a gain between input and output Positive Gain ν If the Output power > input power Negative Gain ν If the Output power < Input Power Unity Gain ν If the power of the input = power of output 2 Gain Stage ν Three levels of audio Every circuit in the signal path that has a control to modify the gain of that circuit. ν ν ν The Signal Paths in any System Mic level Line Level Power Level Basic System Relationships Amplifier Speaker Mic INPUT INPUT Combining and Routing INPUT Types of Inputs ν ν ν Microphone Playback Synthesis MIXER OUTPUT INPUT OUTPUT Playback Recorder Processor OUTPUT OUTPUT Types of Outputs ν ν ν ν Outputs to speaker systems Outputs to recorders Outputs to broadcast Outputs to Analysis or Monitoring 3 Microphone ν Converts sound to electricity Mixer ν Mixes multiple sources into one or more outputs Amplifier ν Boosts line level signal to power level to drive speakers Playback ν Plays back recorded audio data Processing ν Changes the audio in some way Speaker ν Converts electricity to sound 4
