1. 專題研究 語音訊號處理專題
助教：余典翰
指導教授：李琳山
2013/07/30

2. Outline
Acoustics (聲學)
Phonetics (語音學)
Useful Tools

3. Part 1
Acoustics

4. Acoustics (1/4)
Oscillogram (波形圖)
Spectrogram (頻譜圖)

5. Acoustics (2/4) Frequency Amplitude Phase hertz (Hz) decibel (dB)
degree (∘)
period
amplitude
𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦= 1 𝑝𝑒𝑟𝑖𝑜𝑑
phase

6. Acoustics (3/4) F0 (fundamental frequency 基頻)
property of vocal fold (聲帶)vibration
pitch (音高)
fundamental period

7. Acoustics (4/4) F1, F2, F3… (formant frequencies 共振頻率)
properties of vocal tract (聲道)
phone (音素) F3 F2 F1

8. Part 2
Phonetics

9. Phonetics (1/4) Transcription
語音符號
Articulatory phonetics (speech production)
語音發聲
Acoustics phonetics
語音聲學
Auditory phonetics (speech perception)
語音聽覺

10. Phonetics (2/4)
Vowels
Monophthong (單母音)
Diphthong (雙母音)

11. Phonetics (3/4) Consonants Voiced (濁音) Unvoiced (清音) ╳
Plosive/Stop (爆破音/塞音)
Fricative (擦音)
Affricate (塞擦音)
Nasal (鼻音)

12. Phonetics (4/4)
IPA consonants for English

13. Part 3
Useful Tools

14. Useful Tools Praat Wavesurfer http://www.fon.hum.uva.nl/praat/

15. Praat (1/6)

16. Praat (2/6)
Read from file (.wav)

17. Praat (3/6)
Record mono sound (need microphone)

18. Praat (4/6)
Record
Stop
Save to list

19. Praat (5/6)
View & Edit

20. Praat (6/6)

21. Wavesurfer (1/4)
File/Open

22. Wavesurfer (2/4) Choose “Speech analysis”
Do NOT check “default” (next time will crash)

23. Wavesurfer (3/4)

24. Wavesurfer (4/4) Right click and create other panes you need
Ex: power plot

25. Summer Assignment Use praat or wavesurfer to analyze a .wav file
Can you identify any phone by spectrogram?
What kind of vowels or consonants are there?
Can you recognize pitch and formants?
Try out more functions of these tools!

26. Thank You
Questions?