Visualising Animal Sounds Flashcards
What does an Oscillogram show ?
Sound pressure in pascals (Y)
Time in msec (X)
How is sound pressure measured in an Oscillogram ?
By measuring the pressure exerted on the microphone membrane
What is the disadvantage of an Oscillogram ?
Cannot learn about the frequencies of the noise.
Dots appear on the Oscillogram, what do they represent ?
That the data set we are working with is digital.
Data collection has to occur frequently enough to monitor it
What are the advantages of a power spectrum ?
Can measure frequency
Background noise can be filtered out.
Out of the 3 sound visualising graphs, which is the best ?
The Spectrogram.
What does a spectrogram show ?
Frequency (Y)
Time (X)
What is the blue bar, found at the bottom of spectrograms ?
Where filtering of noise has occurred.
Describe what the overtone of a (hockey stick shaped)fundamental frequency would look like ?
A mini hockey stick shape.
How do we measure the width of a fundamental frequency ?
Measure from the centre.
Will appear blurred due to the display.
