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Lecture Summary (12/14/2006)

The heading of this class was again "Phonetics: realising sounds". After dealing with articulatory phonetics in the previous meeting this week's session was about acoustic and auditory phonetics.

We entered the field of acoustic phonetics with the source-filter-model. It starts with the sources larynx (resonant source) and constrictions (noise sources). After that the sound goes through various filters. First in line is the pharyngeal filter followed by the oral and nasal filter (the sound from the noise sources also goes directly to the oral filter).

Mr Gibbon then told us about the speech waveform which shows the amplitude. He used the text "a tiger and a mouse were walking in a field..." for the purpose of illustrating this concept. For the next step, the spectral transform, he only used the word "tiger".

Afterwards we spent a lot of time with the phonetics software "Praat". Mr Gibbon tried to explain the programme and showed us the different windows of Praat, the objects and methods, how to edit a waveform, how to select a segment of a waveform, the different properties of sounds (spectogramme, formants, pitch track), how to copy the segment, how to create a new waveform object and how to save it.

To get started with auditory phonetics we looked at the anatomy of the human ear. We devided it in three main parts: the outer ear (function: microphone), the middle ear (function: amplifier) and the inner ear (function: spectral transform).

31.1.07 21:40

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