Speech as highly complex sound signal
Oscillographic curve of the spoken sentence “It's raining cats and dogs".
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Aperiodical overlap periodical parts. Unlike noises, some of which have similar frequency curves, sound in speech is always the carrier of meaning or of messages sent out by the speaker. Other noises like smacking of lips, hissing, rhythms, basic pitch are typical of the individual (acoustic fingerprint) but not essential for the speech content!
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Supplementary to worksheets and transparencies.
Relevant for teaching:
Vibrations and waves
Communication and understanding