Advanced Digital Systems

TASK Your task should be done in Matlab 2007 in the Texas Instruments area of the University systems. You will create a sine wave signal at 1 kHz, and amplitude 0.1 (no units) using the DSP sine wave generator. You will then add to the sine wave signal a noise signal, created using ‘random source’, of amplitude 0.1 and uniform sampling. Then use FDATOOL to design a filter that has the function of eliminating the audible noise and passing the sine wave. In other words it must decrease the amplitude of the noise by 40 dB. The system sampling rate is 16 kHz. The filter should be of maximum 8th order. Make particularly sure you check the signal carefully when doing audio monitoring. It is good practice to hold the headphones away from your head when checking signal levels. You will then need to plan and execute a series of tests on your design which must use the time scope and spectral analysis plots before and after filtering. You may use the vector concatenate function to combine the signals to reduce the number of spectrum plots. The time scope can be configured for two input signals. Use the audio output to help you to discern whether your filter has worked but remember that it does not cooperate well with the two scopes so you will need a switching facility or separate with audio/without audio models.