Nature of Audio 1 0.0 / 5 ? Music TechnologyNature of AudioASEdexcel Created by: Megan Chalmers RevisionCreated on: 02-02-18 09:28 Q: What is Compression A: The process where molecules move closer together 1 of 20 Q: What is Rarefaction A: Where molecules move further apart 2 of 20 Q: Explain Harmonics A: Every pitched note you hear contains multiple quieter notes at different pitches 3 of 20 Q: What is the main note you hear called? A: The fundamental 4 of 20 Q: This is the _______________ pitch A: Perceived 5 of 20 Q: The timbre changes as you..... A: Add harmonics to the fundemental 6 of 20 Q: As you change the harmonics... A: The wave form can change eg. from a sine wave to a square wave 7 of 20 Q: All sound is variations in what? A: Air Pressure 8 of 20 Q: Electrical sound waves are the result of what? A: Variations in electrical current 9 of 20 Q: What is the process of Acoustic capture? A: Air pressure variations -> Mechanical movement of diagram in mic -> Conversion to magnetic energy -> conversion to electrical energy 10 of 20 Q: What is the process of electronic production? A: Electrical energy -> conversion to magnetic energy -> Mechanical movement of speaker cone -> air pressure variations heard as sound 11 of 20 Q:What is Binary code? A series of on- off voltage commands that computers understand in which sound is stored 12 of 20 Q: How can an engineer alter the waveform A: By cutting and boosting certain points within the waveform 13 of 20 Q: How were waveforms represented before the digital age? A: They were represented by physical grooves cut in shellac or vinyl records then magnetic imprints on derrick oxide on plastic reel-to-reel tape. 14 of 20 Q: How is digital music created? A: By taking multiple samples of an analogue wave form and encoding this information into binary lanuage 15 of 20 Q: What is a sample period? A: The distance between sampling points 16 of 20 Q:How are volume levels captured? A: By devising a waveform into steps 17 of 20 Q: What is a DAC A: Digital to analogue converters 18 of 20 Q: What does a DAC do? A: It decodes digital information back to analogue form. 19 of 20 Q: What is done with the analogue signal after conversion A: it is amplified to a sufficient level that moves the speaker cones. 20 of 20
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