Filters & Resonance

What are the 2 types of presence of number of frequency?

1) simple

2) complex

What are the 2 relationships of frequency components?

1) periodic

2) aperiodic 

What are the 2 durations of sounds?

1) continuous

2) transient

What does simple mean?

one frequency component

What does periodic mean?

repeating pattern

What does complex mean?

more than one frequency component

What does aperiodic mean?

doesn’t repeat itself

What do acoustic filters do?

passes or blocks components of sound of different frequencies

What are the 5 types of filters? 

1) low pass filters 

2) high pass filters 

3) band pass filters 

4) band stop filters 

5) notch filters 

What are low pass filters (LPF)?

-low frequencies pass through

-blocks high frequencies

What type of filter does this represent?

low pass filter

What are high pass filters (HPF)?

-blocks low frequencies

-high frequencies pass through

What type of filter does this represent?

high pass filter

What are band pass filters (BPF)?

allows a particular frequency range “pass through” and blocks/attenuates other frequencies 

What type of filter does this represent? 

band pass filter (BPF) 

What are band stop filters (BSF)?

stops a particular frequency range and allows all other frequencies through 

What type of filter does this represent?

band stop filter (BSF)

What are notch filters?

used to eliminate 1 frequency 

What type of filter does this represent? 

notch filters 

What is the resonance? 

natural vibrating frequency of a system or frequency at which an object vibrates the strongest 

What is resonance a result of?

forced vibrations in a body when the applied frequency matches the natural frequency of the body resulting in high amplitude

What are 2 examples of resonance?

1) rumble strips

2) wine glass

What type of resonator is this?

sharply tuned

What type of resonator is this?

broadly tuned