CS312 Quiz 2 Review w2020
10.1 Class
Test rules
- Must be done in pencil
- Bring an eraser
- You are allowed to bring one 8.5x11 sheet of paper with HAND WRITTEN notes on each side
- Time limit is 70 minutes unless a disability exception has been made. Talk to me after class.
What will be on the test
Most questions are short "essay" form answers.
Sections
- Explain these terms
- Decibels
- Modulation
- Equal Temperament
- Harmonic Series and the 5 classic synth waveforms
- Effects
- Envelopes
These two questions will be on the test
1. Modulation (Week 7.2)
- Given two sine waves 400 Hz and 700 Hz what peaks would you see in the Spectrum for
- a. Ring Modulation where 400Hz is the modulator and 700Hz is the carrier.
b. Amplitude Modulation where 400Hz is the modulator and 700Hz is the carrier.
c. Amplitude Modulation where 700Hz is the modulator and 400Hz is the carrier.
2. ADSR (Week 9.2)
An ADSR envelope has the following values.
- Total envelope duration
- 5.0 seconds
- Attack
- duration is 1000 ms
maximum amplitude is 1.0 - Decay
- duration is 1000 ms
- Sustain
- amplitude level is 0.5
- Release
- duration is 1000 ms
Fill in the sample numbers and amplitude values for each of these states.
KEY DOWN message occurs now envelope starts
Attack
Start and End sample numbers
Start and End amplitude values
Decay
Start and End sample numbers
Start and End amplitude values
Sustain
Start and End sample numbers
Start and End amplitude values
KEY UP message occurs now
Release
Start and End sample numbers
Start and End amplitude values
What will not be on the test
- Equations and formulas
- C++ questions
- MIDI questions
Quiz 2 Review Materials revised
7.2 Class
- ADC
- DAC
- Sample rate
- Bit depth
- Period and Frequency
- Calculate the frequency
- Time domain and frequency domain
- Nyquist Theorem
- Nyquist Rate
- Nyquist Frequency
- Aliasing
- Frequency spectrum
- Decibels and amplitude
- Decibel to amplitude formula
- Amplitude to decibel formula
- Phasors
- Beats and tuning
- Modulation
- Ring Modulation
- Amplitude Modulation
- Frequency Modulation
7.3 Class
- Equal Temperament
8.1 Class
- DC Offset
- RMS amplitude
- Clipping
8.2 Class
- Harmonic Series
- Fundamental Frequency
- Harmonics
- Overtones
- Partials
- Equal Temperament
- Frequency ratio between half steps
- Aliasing
- Bandlimited waveforms
- The Classic Synthesizer Waveforms
- has one harmonic, the fundamental frequency
- has odd numbered integer harmonics of the fundamental frequency
amplitude is reciprocal of the harmonic number - has odd and even integer harmonics of the fundamental frequency
amplitude is reciprocal of the harmonic number - has odd numbered integer harmonics of the fundamental frequency
amplitude is reciprocal of the harmonic number squared
8.3 Class
- Phasor
9.1 Class
- Audio Effects
- Remove DC
- Normalize
- Amplify
- Reverse
- Echos
- Change Speed
Explain what each effect does and what it might be used for.
9.2 Class
- ADSR envelope
- When playing a "piano key" compute the start-end sample numbers and min-max amplitude values of each segment of the ADSR.