Low Pass Filter Essay

Great Essays
1. Introduction
The purpose of this experiment was to gain an understanding of how to use a signal generator, acquire data, understand the concept of a Low Pass Filter, gain knowledge of time domain sampling and sample rate, learn how to analyze and present data in MATLAB, as well as learn how to calibrate a microphone and record sound pressure data. To accomplish this the role of an electronics technician whose responsibility was to validate the performance of data acquisition equipment that will be used to acquire data on an upcoming project was taken on.
2. Effect of a Low Pass Filter
In order to determine the effect of a low pass filter the NI9234 module was connected to the output of the function generator and set to channel 0. The Data
…show more content…
Time Domain Sampling
Implementing the signal generator a sine wave was generated with an amplitude of approximately 3 volts and a frequency of 800Hz. One second of data was recorded at the following sample rates: 2048, 3200, 6400, and 25600 samples/sec. The LPF in the DAQ was then set to 1Hz below the Nyquist frequency for each different sample rate. The maximum amplitude seen for each acquisition were as follows:
• 2048Hz: 1.5229e-04 V
• 3200Hz: 1.1791e-04 V
• 6400Hz: 1.3520e-04 V
• 25600Hz: 9.6897e-05 V
As evidenced by the above data, the maximum amplitude changed based on the sampling rate that was used. With (______) data samples per period of the sine wave are expected for each of the following frequencies.
• 2048Hz: (__)
• 3200Hz: (__)
• 6400Hz: (__)
• 25600Hz: (__)
5. Microphone
…show more content…
A sine wave was generated with the function generator at 200Hz. The amplifier was turned off and the volume, or gain, was adjusted so that the tone could be heard but a level that was not loud enough to disturb the other groups in the lab. The microphone was then placed close to the speaker 3-6 inches away using the stand that was supplied. The DAQ system chosen to record the tone was microphone in order to determine the sound pressure level of a tone. The LPF settings were then changed to ensure that the recording was

Related Documents

  • Superior Essays

    Speed Of Sound Lab Report

    • 1039 Words
    • 5 Pages

    Take the average time for all three distances, and divide the time by the distance. This will lead to three different speeds of sound. XII. Calculate the average speed of…

    • 1039 Words
    • 5 Pages
    Superior Essays
  • Decent Essays

    Ecet 340 Week 4

    • 1985 Words
    • 8 Pages

    ECET 340 Week 4 HomeWork 4 Purchase here http://devrycourse.com/ecet-340-week-4-homework-4 Product Description Determine the conversion time for an ADC0804 (8-bit), where 66 clocks per bit are required, if its clock frequency is 50 kHz. 2. If an 8-bit SAR has Vref = 10 V, what is the binary value for an input voltage of 7.28 V? 3. What is the percent error for the binary answer found in Problem #2?…

    • 1985 Words
    • 8 Pages
    Decent Essays
  • Improved Essays

    We were also able to develop graph, in which related the tip displacement and strain gage output. Before beginning the lab it is important to make sure that we calibrate the strain gages to make sure that were are getting realistic calibrated…

    • 2086 Words
    • 9 Pages
    Improved Essays
  • Superior Essays

    Light Synthesis Principles

    • 1807 Words
    • 8 Pages

    Light synthesis principles The basic idea of light waveform synthesis can be described as follows: First, the spectrum of a light waveform is decomposed into its constituent spectral components by a disperser, then, adequate modulators acting on each of this spectral components individually modifies the relative phase (or delay), the amplitude and polarization of these components before they are coherently superimposed again by a combiner to create a desired tailored waveform (Figure 2a)41. Although, any arbitrary field waveform can be composed by applying the above idea, in reality the arbitrariness is sensitive to two key parameters. These are: first, the spectral resolution of the disperser ( ) which defines the temporal window (T) with in which the control can be exerted. Second, the total bandwidth ( ), this defines the shortest temporal feature ( ) that can be sculpted upon the intensity profile of…

    • 1807 Words
    • 8 Pages
    Superior Essays
  • Superior Essays

    The circuit has 2 resistors, one with 100 Ω of resistance and the other with 1KΩ, and a voltage source of 3 volts in series in a closed circuit. Tables 2 through 5 show the data for circuits 2-5. Circuit 2 includes a voltage source of 3 volts and two resistors with resistances of 100Ω and 1 KΩ. This time, the resistors are in parallel in a closed circuit. For circuit 3, there is a combination of resistors in parallel and in series.…

    • 1403 Words
    • 6 Pages
    Superior Essays
  • Superior Essays

    Porous Materials Essay

    • 882 Words
    • 4 Pages

    The sound source used is a pure tone and is adjusted so the distance between each microphone is exactly an odd number of quarter wavelengths. A frequency of less that 100Hz should be used to minimise the effects of flow reactance. The sample is placed adjacent to the first microphone. The flow resistance using this method is given by: r=(ρ_0 c)/l 〖10〗^((L_p1-L_p2)/20) Where L¬¬p1 and Lp2 are the pressures measured from each microphone…

    • 882 Words
    • 4 Pages
    Superior Essays
  • Improved Essays

    12 shows the radiation pattern of the E-Field at phi = 0 degrees, and Fig. 13 shows the radiation pattern with varying phi from -180 to 180 degrees with an increment of 5 degrees, which showed a good variation of the power radiated by an antenna as a function of the phi as expected. Fig. 13 shows the far-field 3D polar plot of the Gain in dB, and as predicted, the gain is 3.8 dB, which is relatively small. Finally, Fig.…

    • 1103 Words
    • 5 Pages
    Improved Essays
  • Improved Essays

    Ecg Lab Report

    • 1388 Words
    • 6 Pages

    The aim of this project is to develop an Electrocardiography (ECG) amplifier circuit from scratch. The main challenges include amplifying the desired week signal in the presence of noise from other muscles and electrical sources. As this semester was about transistors we had to use transistors at some stage in this project. The project was successfully designed and built in two ways: one with solely using operational amplifiers and other using transistors as differential amplifiers. Electrocardiography (ECG)/ Background The heart is one of the vital organs in the human body.…

    • 1388 Words
    • 6 Pages
    Improved Essays
  • Improved Essays

    Some options of types of DAQs and setup of DAQs for this senior design project are discussed in section 3 of the tech memo. Section 3: Data Acquisition Devices When choosing a DAQ for a particular application, it is important to consider what types of signals need to be measured and generated, whether signal conditioning is needed, the needed sampling frequency, the desired resolution, and the amount of allowable error6. The design of the system for measuring the angle of twist and output signals of the measurement devices will determine which DAQ is appropriate for the project. Because some of the instruments discussed in Section 2 have analog outputs, it is likely that a multifunction…

    • 1387 Words
    • 6 Pages
    Improved Essays
  • Improved Essays

    Those values were 3.6 for area, 25.3 for volume, and 10.8 for density. After that the percent uncertainty was calculated by using the formula 100(uncertainty)/(original value). The values for area, volume, and density are 1.53, 4.23, and 4.09. The expected percentage was then calculated by adding up the percentages from the dimensions used in calculating the quantity. For area the expected was 1.52, the volume 4.23, and for density 4.29.…

    • 976 Words
    • 4 Pages
    Improved Essays