In our case we need to increase the sample rate from

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Unformatted text preview: , so let’s assume that we only need to worry about frequencies up to the highest frequency in the third harmonic – that is, 36+5 = 41 kHz. Then we need a sample rate of at least 82 kHz. There is an operation called upsampling – interpolation that can be used to effectively increase the sample rate in a DT signal. This will be discussed in detail in ECE 565 – the basic idea is that to increase the sample rate of x by integer factor L, we first insert L- 1 zeros after each sample in x (which increases the signal length by factor L), and then put the signal through a DT LPF having cutoff frequency 1/2L. In our case, we need to increase the sample rate from 22.05 kHz to something greater than 82 kHz. So, we can set L = 4 to get a new effective...
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This homework help was uploaded on 03/06/2014 for the course ECE 563 taught by Professor Goeckel during the Fall '11 term at UMass (Amherst).

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