The topic of this lecture was "Acoustic Phonetics", especially speech waveform and spectral transform (which can be done e.g. by using special software like Praat

Homework

Download the Praat software on to your computer:

• install it
• read an audio file
• experiment with the software

The audio file used for this is the phrase "A tiger and a mouse were walking in the field".

This is what the waveform of the whole sentence looks like:

You also can select parts and draw waveforms of them; this is what "walking" looks like:

This is the "walk-" part of the word:

Take a look at models of the ear: summarise the
functions of the outer ear, the middle ear, the inner ear

outer ear:

• collecting sound vibrations and carrying them to the eardrum
• wax glands: producing wax to prevent foreign objects from traveling down the ear canal

• vibrations of ossicles amplify and are transmitted into the inner ear (cochlea)
• eustachian tube: controlling air pressure and bringing in fresh oxygen

• structures for hearing and balance
• moving of hair cells in the cochlea produces electric impulses which are sent to the brain and interpreted there as sound information