Download presentation

Presentation is loading. Please wait.

Published byEleanor Lansing Modified over 3 years ago

1
1 Discrete Fourier Transform

2
2 Multiply element-by-element

3
3 Cumulative sum shows:

4
4 2 signals of same frequency and phase

5
5 Multiply element-by-element

6
6 Non-zero cumulative sum

7
7 Same frequency but /2 phase difference

8
8 Element-by element product with both sine and cosine waves

9
9 Cumulative sums

10
10 Wave: partly sine, partly cosine

11
11 Element-by-element multiplication

12
12 Cumulative sum

13
13 dftsimp2demo(f, fs, timelen, amp) dftsimp2demo(200, 1000, 0.02, 1)

14
14 dftsimp2demo(f, fs, timelen, amp) dftsimp2demo(200, 1000, 0.05, 1)

15
15 dftsimp2demo(f, fs, timelen, amp) dftsimp2demo(200, 10000, 0.05, 1)

16
16 dftcomplex2demo(f1, f2, fs, timelen, a1, a2) dftcomplex2demo(200, 400, 10000, 0.02, 5, 4)

17
17 dftcomplex2demo(f1, f2, fs, timelen, a1, a2) dftcomplex2demo(200, 400, 10000, 0.02, 5, 4)

18
18 dftspeech2demo(wavfile, timelen) dftspeech2demo('atest.wav', 0.04)

19
19 dftspeech2demo(wavfile, timelen) dftspeech2demo('atest.wav', 0.04)

20
20 Use dB scale and frequencies to F s /2

21
21 dftspeech2demo(wavfile, timelen) dftspeech2demo(‘itest.wav', 0.04)

22
22 dftspeech2demo(wavfile, timelen) dftspeech2demo(‘itest.wav', 0.04)

23
23 DFT Procedure Given the window (frame) length, decide the base frequency Multiply by sine wave at each multiple of base frequency Multiply by cosine wave at each multiple of base frequency Calculate magnitude and phase spectra using

24
24 Complex Exponential Given the window (frame) length, decide the base frequency Multiply by sine wave at each multiple of base frequency Multiply by cosine wave at each multiple of base frequency Calculate magnitude and phase spectra using

25
25 Compact Formulae DFT IDFT

Similar presentations

OK

Spectral Analysis AOE 3054 23 March 2011 Lowe 1. Announcements Lectures on both Monday, March 28 th, and Wednesday, March 30 th. – Fracture Testing –

Spectral Analysis AOE 3054 23 March 2011 Lowe 1. Announcements Lectures on both Monday, March 28 th, and Wednesday, March 30 th. – Fracture Testing –

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Download ppt on floods in india Ppt on solar power projects Doc convert to ppt online Ppt on field study 4 Ppt on p&g products rebates list Ppt on different types of forests in the united Download ppt on social impacts of it Download ppt on coastal plains of india Ppt on thyroid function test Ppt on unity in diversity biology