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To characterize the channel, we input an impulse by recording the tapping of the mic with our fingers. We then played that sound through the speaker and recorded the response with the mic. The signal is below, along with its spectrum.
We did this in preparation for the receiving end of the system to divide the received signal’s FFT by the impulse response’s FFT.
Below are plots of our transmitted and received signals, along with their spectrums. You will notice a great similarity between the signals in time, however a distinct difference in frequency. Unfortunately, this loss in frequency will translate to a loss of information.
Above are plots for our transmitted and received signals. Here we used a block length of half the duration of the signal and sent it through the air at 44.1 kHz.
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