COMD 5070 Final Exam Practice Questions Review

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COMD 5070 Final Exam Practice Questions Review

1. What is Science?: 1. Empirical: Based on data 2. Deterministic: Obeys physical laws of cause and effect (not random) 3. Predictive: if you do this...then that will happen; it can influence another one 4. Parsimonious: use simplest explanation possible rather than make unnecessarily complicated - boil it down to its essence, without dumbing down. 2. Semitones (how many semitones in one octave, two octaves, etc.): Octave: changes mathematical relationship bw frequencies; doubling (up)/halving (down) of frequency 400= 800 (up) & 200 (down) -12 semitone= 1 octave 200-400Hz=1 octave = 12 semitones 200-800Hz=2 octaves = 24 semitones 3. Sampling Rate (How does it relate to playback quality, file size, frequencies saved in Recording, nyquist, etc.?): - Sampling Rate (snapshots): (specified in Hz) frequency of numbers stored/written to act as sampled analog signal: discrete snapshots in rapid succession. Linked with quality level. Numbers represent amplitude values; more samples, better can represent original signal. Rapidly changing signal needs more samples/dos to reflect all changes in original. Too low sampling rate & changes missed. Think movie shot @ 30fps looks continuous. Any lower tho would look jerky. -Higher Sampling Rate selection: gives better fidelity; BUT= files & storage disk space uses more memory processing time, & computational power. Nyquist Frequency=Half of sample rate. Highest freQ can record & play back accurately. Must sample @2x rate of the highest FreQ. Ex: CD sample rate=44,100 amps or snapshots/sec & stores signal up to 22,050Hz (corresponds to upper limit of most ppls hearing).To record up to 100Hz, SR=200Hz 1/2 Sample Rate=Nyquist FreQ (100HZ=original amount). 4. Filter types (What do high or low pass or band pass or band reject filter do?: 1. High Pass Filter - Allows High frequencies thru but removes or attinuates or holds lower Frequencies 2. Low Pass Filter - Allows lower frequencies thru but removes or attinuates or holds higher Frequencies 3. Band Pass Filter - Allows a band of frequencies thru but removes or attinuates or holds higher and lower Frequencies

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