annotated-LAB1

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School

University of North Texas *

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Course

3030

Subject

Electrical Engineering

Date

Feb 20, 2024

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pdf

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Uploaded by DoctorExplorationArmadillo27

LAB ASSIGNMENT 1 : LAB ANSWERS: TYPE THE ANSWERS INTO THE DOCUMENT ALONG WITH THE PICTURES. Read the document labeled as Praat instructions. Install praat on your computer per instructions. LAB TASKS: A) There is a sound file called 44100HZ-16bit. IN THE Lab folder on canvas. Download the file somewhere on your computer and per instructions you have in the praat document, Open this file in praat. It will initially look like a solid black pane. You need to zoom in to see the waveform. Create a spectrogram pane, waveform pane, and a pitch contour pane for the sample. Look at the PITCH CONTOUR pane. The default setting for the duration of the time segment per dot (in Pitch Contour) is 10 ms. B) Record the following sounds using praat and save them separately (sustain each for 3-5 sec) /al, /il ,/sl, Iney/. [Record your recording until you have a signal that is neither “clipped” nor too low.] QUESTIONS: 1. Take the screen shot from the waveform of the downloaded sounds files from canvas (44100HZ ) and all the recorded sounds and paste here (just make sure you have zoomed in enough that we could see the cycles clearly). modifiable soun VANAAAT NVVUU\/V 5000 Hz ved spectrogram —e— derived pitch gog 1y, 14.917190 Visibls rt 0.027151 dt 14.944340 14917190 | e seconcs | 15.055660 | [ Total duration 30.000000 seconds | /a/

1111111 0.07196 ~ modifiable sound Jﬂ | . | NHH\ .F/\ ,“JJ \\ . “F\ A H\ J’r\ mf\ mn(J\. i nwaw i AL A e "%"J W'N W Wv V {(JI \H M{ vy vy w FJ 1‘ | | | L ‘ uf\\.\ ‘ | | ctrogram derived ’;naoom 1.674632 [1.674632 Visible part 0.047744 seconds 1.722375| 1.674632 /s/

0.03598 ~ modifiable sound 0Hz 50 Hz 1.846338 Visible part 0.008005 seconds 1.854343) 1.846338 I o~ M 1.846338 /hey/ 0.02197, -0.01178, 0.055770 l 0.059461 1.386521 [1.386521 Visible part 0.115231 seconds 1.501752| 0.827500 Reflect on the differences between the waveforms for your recordings and the audio file in the folder (44100HZ). In particular periodic vs aperiodic and simple vs complex waves. 44100HZ Periodic and simple /al periodic and complex /il aperiodic and complex /s/ aperiodic and complex /hey/ aperiodic and complex Label the following for one of the waveforms you screenshot: We used /s/ screenshot

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0.03598 ‘{— .’,““-5 ~ modifiable sound gt = oMS—Tive W derived spectrogram _—e— derived pitch go0 Hz OHZ'*-('AKK Tine 50 Hz 1.846338 Visible part 0.008005 seconds 1.854343 s/ 18633 | ks 1.846338 x-axis , Y-axis for the waveform, x-axis , Y-axis for spectrogram, one cycle, wavelength, and amplitude for one of the waveforms ¥ 4. A) Calculate the frequency for one of your recordings for 10 ms. (0.01s) 2/0.01 =200 Hz b) Looking at the Y axis, is the FO what you expect? Yes, we calculated the frequency to be 200 and the FO is close to 200 (227). You can show these pictures by pressing the ALT and PRNT SCRN keys on your keyboard simultaneously. If you accidentally get the whole computer screen, you can try again after clicking on the screen section you want, or you can edit the file in PAINT (from the START menu, click on Programs, Accessories, then PAINT). If you save the image, you can PASTE it into a WORD document. To manipulate it, click on format picture, and choose Text Wrapping—Tight Upload your WORD document into the Assignment called Lab 1.