How Do Sustained Consonants Like Shhhh Appear on an Oscilloscope?

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Sustained consonants like "Shhhh" produce a sound that resembles white noise on an oscilloscope, generating multiple frequencies without a distinct periodic wave. In contrast, singing and humming create more periodic disturbances, resulting in a clearer waveform. This difference highlights the unique acoustic properties of sustained consonants compared to other vocal sounds. The lack of periodicity in the "shhh" sound makes it visually distinct on the oscilloscope. Understanding these differences can enhance the analysis of sound waves in various applications.
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I overlooked a problem in my lab manual and wasn't able to complete the last problem, I was wondering if anyone would know anything about Oscilloscope:

What happens when sustained consonants such as "Shhhh" sound on Oscilloscope differ from other consonants or humming/singing?
 
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The "shhh" sound acts like white noise - multitudes of different frequencies are generated. So no periodic wave will be obseved, while singing and humming might display some periodic disturbances.
 
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