EECS 1520 MIDTERM 2 EXAM
QUESTIONS WITH 100% CORRECT
ANSWERS | LATEST VERSION 2025/2026.
Sound waves are a form of: - ANS Analog
Electrical signals are a form of: - ANS Digital
What is microphone also known as: - ANS A transducer
What converts sounds waves to electrical signals? - ANS A microphone (transducer)
What do speakers do? - ANS Convert digital into sound waves
What is the term for converting analog into digital? - ANS Sampling
What is the term for the production of sound waves? - ANS Synthesis
Define this formula: S(t) = 𝑎 sin(2 𝜋 𝑓(𝑡 − 0)) - ANS a = amplitude
f = frequency
t = time (final)
1 | Page @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, 0 = phase (time shift or starting time)
What is the unit for amplitude? - ANS dB (decibel)
What is the unit for frequency? - ANS Hz (hertz)
Amplitude is known as - ANS Intensity (loudness)
Frequency is known as - ANS Perceived pitch
The average human hearing frequency in Hz is - ANS 16 Hz to 20 kHz
Sampling/samples are known as - ANS Measurements
What is sampling rate? - ANS It is a fixed rate
Increased sampling rate means - ANS Larger file and better quality
Decreased sampling rate means - ANS Smaller file and lower quality/inaccurate
Who gave the idea of sample interval < half period? - ANS Nyquist-Shannon
Higher bit depth means: - ANS A more accurate sample
What is known to use <8 bits - ANS To record physical processes (not used to record sound)
such as blood pressure, heartbeat, motion due to walking/running
2 | Page @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
QUESTIONS WITH 100% CORRECT
ANSWERS | LATEST VERSION 2025/2026.
Sound waves are a form of: - ANS Analog
Electrical signals are a form of: - ANS Digital
What is microphone also known as: - ANS A transducer
What converts sounds waves to electrical signals? - ANS A microphone (transducer)
What do speakers do? - ANS Convert digital into sound waves
What is the term for converting analog into digital? - ANS Sampling
What is the term for the production of sound waves? - ANS Synthesis
Define this formula: S(t) = 𝑎 sin(2 𝜋 𝑓(𝑡 − 0)) - ANS a = amplitude
f = frequency
t = time (final)
1 | Page @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, 0 = phase (time shift or starting time)
What is the unit for amplitude? - ANS dB (decibel)
What is the unit for frequency? - ANS Hz (hertz)
Amplitude is known as - ANS Intensity (loudness)
Frequency is known as - ANS Perceived pitch
The average human hearing frequency in Hz is - ANS 16 Hz to 20 kHz
Sampling/samples are known as - ANS Measurements
What is sampling rate? - ANS It is a fixed rate
Increased sampling rate means - ANS Larger file and better quality
Decreased sampling rate means - ANS Smaller file and lower quality/inaccurate
Who gave the idea of sample interval < half period? - ANS Nyquist-Shannon
Higher bit depth means: - ANS A more accurate sample
What is known to use <8 bits - ANS To record physical processes (not used to record sound)
such as blood pressure, heartbeat, motion due to walking/running
2 | Page @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
