Let the signal to be filtered be the first 100 samples from MATLAB chirp signal.
ID: 2082850 • Letter: L
Question
Let the signal to be filtered be the first 100 samples from MATLAB chirp signal. To this signal add some Gaussian noise to be generated by r and n, scale the signal to 0.1, and add it to the 100 samples of the chirp signal. Design three discrete filters, each of order 20, and a half frequency (for Butterworth butter) and passband frequency (for the Chebyshev filters) of omega_n = 0.5. For the design with cheby1 let the maximum passband attenuation be 0.02 dB, and for the design with cheby2 let the minimum stopband attenuation be 40 dB. Obtain the three filters and use them to filter the noisy chirp signal. Use MATLAB plot the following for each of the three filters: a) Using fft function compute the DFT of the original signal, the noisy signal and the noise and plot its magnitude. Is the cut-off frequency of the filters adequate to get rid of the noise? Explain. Compute and plot the magnitude and poles & zeros for each of the three filters. Comment on the differences in the magnitude responses. b) Use the filter function to obtain the output of each of the filters. Also plot the original noiseless signal and filtered signal. Compare them.Explanation / Answer
The DPDT relay (Double Pole Double Throw) is quite interesting and can be used in various scenarious, including for changing the direction of a motor as you can see in the picture below. It has 2 terminals and 4 connectors and you can look at the DPDT relay as the equivalent of 2 Single Pole Double Throw SPDT relays.
As you can see in the schematic the 12V battery (or use other voltages) is connected with the plus at terminal T1 and minus at terminal T2. The contact 1 and 4 are connected together as 2 and 3 are too.
Without voltage applied to the coil the battery plus is connected to contact 1 (and 4) and minus to 3 (and 2) therefore the motor is turning in one direction (let’s say clockwise). When voltage is applied to the coil then the relay switches and now T1 (plus) is connected to contact 2 (and 3) and T2 (minus) is connected to 4 (and 1) therefore the motor is changing the direction of rotation
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