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Essay text:
? Core Functions
? Conversion of analogue signal to digital form for
computer storage
? Conversion of digitally stored sound information to
analogue form
? Common Additional Features
? MIDI control
? Synthesiser
? FM mixing
? Stored samples (wavetable)
? Software to allow basic control and use of
soundcard features
? Input is an analogue electrical signal
representing sound
? Microphone
? Pickup coil
? Tape, cd player, instrument, or generator
? Samples of this are taken at intervals and
converted to digital data
? Quality and usability dictated by
? Samples per second
? Levels per sample
? Samples per second normally expressed
in kHz
? More samples give greater accuracy of
waveshape
? Minimum sample rate = 2 x highest frequency
? Bits per sample
? More bits per sample more resolution of
amplitude of waveform
? 8-bits give 256 levels
? 16-bits give 65K levels
File size depends on number of bits per sample
and sample rate
? 11kHz sample rate at 8-bits per sample = 11kB
? 22kHz sample rate at 16-bits per sample = 44kB
? 44kHz sample rate at 10-bits per sample = 88kB
? Note that these are for single channel ? for
stereo you need double the storage...
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