Wk7: Frequency Response
Abbreviation Key:
Monday, February 17, 2020 1:55 PM
w/ = with
vs = versus
--> = thus, or therefore
Ex. = For example,
• Objective: We will measure resonance and distortion using cheap speakers, and Expt = experiment
use Fourier Analysis.
• Resonance: frequencies that maximize the energy transfer to the system.
• Response: ratio of detected signal to true signal. Measured / Theoretical
• An ideal detector of frequency response is a flat, horizontal line on a
Response(units V) vs Frequency(units Hz) plot.
○ The measured voltage is linearly proportional to the physical property being
measured. -->
○ A lot of behaviors of physical systems can be answered w/ frequency
response measure.
• A good detector gives a flat response over a restricted frequency range.
• A poor detectors exhibits resonances (maximum response).
○ Near resonance, the measured signal is due to of the properties of the
Independent: waveforms
Dependent: frequency response
detector, not the physical property being measured.
Can manipulate the signal given (alter frequencies
• Ex. Earthquake vs Skyscraper that meet system's sensitivity range) to show a
response.
○ To avoid a skyscraper falling down, the skyscraper must be designed in a way
so that its resonances avoid dominant frequencies of ground motion.
Abbreviation Key:
Monday, February 17, 2020 1:55 PM
w/ = with
vs = versus
--> = thus, or therefore
Ex. = For example,
• Objective: We will measure resonance and distortion using cheap speakers, and Expt = experiment
use Fourier Analysis.
• Resonance: frequencies that maximize the energy transfer to the system.
• Response: ratio of detected signal to true signal. Measured / Theoretical
• An ideal detector of frequency response is a flat, horizontal line on a
Response(units V) vs Frequency(units Hz) plot.
○ The measured voltage is linearly proportional to the physical property being
measured. -->
○ A lot of behaviors of physical systems can be answered w/ frequency
response measure.
• A good detector gives a flat response over a restricted frequency range.
• A poor detectors exhibits resonances (maximum response).
○ Near resonance, the measured signal is due to of the properties of the
Independent: waveforms
Dependent: frequency response
detector, not the physical property being measured.
Can manipulate the signal given (alter frequencies
• Ex. Earthquake vs Skyscraper that meet system's sensitivity range) to show a
response.
○ To avoid a skyscraper falling down, the skyscraper must be designed in a way
so that its resonances avoid dominant frequencies of ground motion.
