Class Note for PHYSICS 289 at UMass
Class Note for PHYSICS 289 at UMass
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This 2 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Massachusetts taught by a professor in Fall. Since its upload, it has received 15 views.
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Date Created: 02/06/15
PHYSICS 289 Experiment 6 Fall 2005 SOUND Analysis and Synthesis of Sounds Only a short report is required for this experiment Bring a portable music player if you can INTRODUCTION This is a qualitative rather than quantitative experiment using Wave Port in Data Studio The Sound Analyzer component will display the frequencies present in any sound presented to it A sound clip can be saved for later analysis or reference A fast Fourier transform FFT is available to determine the frequencies present in a sound clip The Sound Creator component generates a sinusoidal wave that is displayed and played through the headphones The frequency and amplitude can be varied with the mouse Sound Creator can generate multiple sine waves and superimpose them for presentation on the screen and to an audible output GETTING STARTED Open Data Studio DS by clicking on the icon on the desktop and select Open Activity Open BlankS0undExptds in the Cstudent tempp289 folder Immediately click on File and Save Activity As and save the activity with a file name of your choice Open the Sound Analyzer and speak into the microphone to be certain that your system is functioning Use the StartStop button at the top to record a sound clip The data output icon is to the right of the screen with an arrow Click this icon to save a displayed sound clip DS does not label these so you will have to keep notes on what data each color and symbol represents Drag the graph tool to the sound level data in order to redisplay the sound waveform on a graph Drag the FFT tool to the sound level data to obtain the frequency content You may want to decrease the default bin size in the Fourier transform tool to get finer frequency resolution Open Sound Creator to reveal a new window with two panels To the left of the upper panel are four buttons Click on one of the buttons and manipulate the frequency and amplitude of the sine wave by using the mouse or clicking on the frequency buttons at the top You can hear the sound wave using the headphones by going to the lower panel and clicking on the loudspeaker icon and the button with the same color as above If you select a second button the corresponding sine wave from the upper panel will be added to the first The resulting sound wave is displayed in the lower panel and played through the headphones The upper panel displays the individual input waveforms and the lower panel displays their sum The buttons at the left of the upper panel select which waveform is being modified and those near the microphone symbol select which tones are displayed and heard Selecting different elements of the 4 bar icon beside the lower panel alters the time scale of the summed waveform Vary the frequency slightly for one of the inputs while their sum is being displayed You should see and hear a change in the output WORKSHEET Your worksheet will consist of a description of the sounds you analyzed or synthesized and your observations Write this as you go along Attach interesting printouts to your worksheet but please be judicious in your choice of what is worth printing Please write legibly If it cannot be read it cannot be graded Write down at least five things you learned about waves and sound More is betterSee the reverse side for suggestions regarding phenomena to observe OBSERVATIONS and DATA You are free to make any observations you wish The following are suggestions to get started IN SOUND ANALYZER Tuning forks Strike the tuning fork and observe the frequency composition of the sound Strike the fork before starting to record and stop recording before the tuning fork has stopped vibrating See if you can minimize the higher harmonics See if you can maximize the higher harmonics Does your hearing agree with what you see on the screen Does the Fourier transform give you back the frequency you expected Are there additional frequencies you didn t expect What do you see at low frequencies below 100 Hz in the frequency spectrum Speech Speak into the microphone and observe the waveforms Do the vowels all look the same or do some stand out as different In what frequency range does you voice seem concentrated Whistle 0r sing Whistle or sing into the microphone Is the pattern what you had expected Music Play some music on an MP3 or CD player connected to the input cable and see what it looks like IN SOUND CREATOR Sine waves Clicking the round icon on the right causes a sine wave to be generated You can play with the frequency and amplitude but you cannot conduct a quothearing testquot because of the low quality of the headphones Beats Generate two sine waves as above The buttons to the left of the panels select which sine wave is being controlled and which waves are sent to the output Change the frequency of one of the waves slightly and you should see and hear the beat pattern Explore the beat pattern and its dependence on the frequency difference More beats Match the frequency of a single sine wave to that of a tuning fork The frequency calibration in Wave Port may not be correct in which case you will have to do the matching by trial and error Place one headphone near one ear and the tuning fork near the other You should hear beats when the frequencies differ slightly Where are the waves being combined Square wave The square icon on the right causes Sound Creator to generate a square wave Doubleclick on the display and turn on all 4 input waves the maximum Use the buttons on the left to turn off all but the lowest frequency Add in the other waves one at a time and observe how the sum changes Can you generate a better square wave by changing the frequency or amplitude For this exercise start by generating waves that are close to multiples of each other such as 500 Hz 1500 Hz 2500 Hz and 3500 Hz to generate a square wave or 500 1000 1500 and 2000 Hz for a triangle wave then adjust the amplitudes to try to make a square wave or triangle wave
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