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Yet more glossary tweaks.
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**Hz**: hertz. a unit representing divisions of one second. 1 Hz means once per second; 100 Hz means one hundred times per second. also, _kHz_ (kilohertz, one thousand per second) and _MHz_ (megahertz, one million per second).
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**interpolate** (pattern): to fill in the area between two values with a smooth ramp of values in between.
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**interpolation** (sample): filtering of sample output to remove unintended harmonics and achieve a smoother sound.
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- analogous to image antialiasing.
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- some sample-based chips can perform interpolation, but most cannot.
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**interpolate**: to fill in the area between two values with a smooth ramp of values in between.
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- some sample-based chips can interpolate, filtering out unwanted harmonics.
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**ladder effect**: an inaccurate yet common term for the DAC distortion that affects some Yamaha FM chips.
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**LFO**: low frequency oscillator. this is a slow, often subsonic oscillator used to alter other sounds.
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**LFO**: low frequency oscillator. a wave with a slow period (often below hearing range) used to alter other sounds.
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**macro**: a sequence of values automatically applied while a note plays.
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**oscillator**: a sine wave or other basic waveform used as sound or to alter sound.
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**PCM**: pulse code modulation. a stream of data that represents sound as a rapid sequence of amplitudes.
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- CD tracks and .wav files are PCM.
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- .flac files are compressed PCM that must be converted to .wav outside Furnace before use.
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- .ogg and .mp3 are compressed differently from PCM. they must also be converted to .wav before use.
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**period**: the length of a repeating waveform. as frequency rises, the period shortens.
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