COMD 5070 Exam 3 ACTUAL Exam
Questions and CORRECT Answers
Science - 4 Characteristics - CORRECT ANSWER - Empirical
Deterministic
Predictive
Parsimonious
Empirical - CORRECT ANSWER - Based on collected data
Deterministic - CORRECT ANSWER - Obeys physical laws
Predictive - CORRECT ANSWER - When one phenomena occurs it will influence another
Parsimonious - CORRECT ANSWER - Use the simplest explanation possible
Semitones - CORRECT ANSWER - 12 semitones per octave
Non-linear - each successive step (octave) is larger, though they sound as if they are equal is
increasing frequency
Semitone Standard Deviation (STSD) - CORRECT ANSWER - Used to measure
variability since they correspond more closely to pitch perception; using Hz as a measure is
difficult for humans to perceive
Using STSD makes values comparable for high or low mean F0
Sampling Rate - CORRECT ANSWER - The amount of which amplitudes recorded to
represent the analog sample, the more amplitudes the better the representation which results in a
large file needed
Sample rate is specified in Hz
, Nyquist Frequency - CORRECT ANSWER - The highest frequency you can record that
can be accurately reproduced. Should be set for twice the highest frequency in the sample.
Aliasing - CORRECT ANSWER - Sampling too little will inaccurately represent the
signal. E.g. high frequencies will be recorded too low, and vice versa for low frequencies.
Anti-aliasing - CORRECT ANSWER - Use low pass filter to prevent aliasing. E.g. set to
Nyquist frequency will result in frequencies above this being deleted so they cannot contaminate
the recording.
Modern recording systems do the filtering automatically
Filter Types - CORRECT ANSWER - Allow us to be selective about the frequencies we
examine.
Four types: High Pass, Low Pass, Band Pass and Band Reject.
High Pass Filter - CORRECT ANSWER - Allows high frequencies through, attenuates
(holds back) lower frequencies
Low Pass Filter - CORRECT ANSWER - Allows low frequencies though, attenuates
higher frequencies
Band Pass Filter - CORRECT ANSWER - Attenuates both high & low frequencies
Band Reject Filter - CORRECT ANSWER - Attenuates a specific band of frequencies,
allows both high & low frequencies through.
Fourier Analysis - CORRECT ANSWER - Creates a spectrum from the time domain;
allows us to analyze the formants (ingredients) of sound (cake).
Questions and CORRECT Answers
Science - 4 Characteristics - CORRECT ANSWER - Empirical
Deterministic
Predictive
Parsimonious
Empirical - CORRECT ANSWER - Based on collected data
Deterministic - CORRECT ANSWER - Obeys physical laws
Predictive - CORRECT ANSWER - When one phenomena occurs it will influence another
Parsimonious - CORRECT ANSWER - Use the simplest explanation possible
Semitones - CORRECT ANSWER - 12 semitones per octave
Non-linear - each successive step (octave) is larger, though they sound as if they are equal is
increasing frequency
Semitone Standard Deviation (STSD) - CORRECT ANSWER - Used to measure
variability since they correspond more closely to pitch perception; using Hz as a measure is
difficult for humans to perceive
Using STSD makes values comparable for high or low mean F0
Sampling Rate - CORRECT ANSWER - The amount of which amplitudes recorded to
represent the analog sample, the more amplitudes the better the representation which results in a
large file needed
Sample rate is specified in Hz
, Nyquist Frequency - CORRECT ANSWER - The highest frequency you can record that
can be accurately reproduced. Should be set for twice the highest frequency in the sample.
Aliasing - CORRECT ANSWER - Sampling too little will inaccurately represent the
signal. E.g. high frequencies will be recorded too low, and vice versa for low frequencies.
Anti-aliasing - CORRECT ANSWER - Use low pass filter to prevent aliasing. E.g. set to
Nyquist frequency will result in frequencies above this being deleted so they cannot contaminate
the recording.
Modern recording systems do the filtering automatically
Filter Types - CORRECT ANSWER - Allow us to be selective about the frequencies we
examine.
Four types: High Pass, Low Pass, Band Pass and Band Reject.
High Pass Filter - CORRECT ANSWER - Allows high frequencies through, attenuates
(holds back) lower frequencies
Low Pass Filter - CORRECT ANSWER - Allows low frequencies though, attenuates
higher frequencies
Band Pass Filter - CORRECT ANSWER - Attenuates both high & low frequencies
Band Reject Filter - CORRECT ANSWER - Attenuates a specific band of frequencies,
allows both high & low frequencies through.
Fourier Analysis - CORRECT ANSWER - Creates a spectrum from the time domain;
allows us to analyze the formants (ingredients) of sound (cake).
