RIU 324 Lecture Notes - Lecture 46: Sonographer, Acoustic Impedance, Nissan Pulsar
Document Summary
This slide mimics the earlier slide showing how sampling of an analog signal occurs. This time, the analog signal is higher frequency (the signal changes faster with respect to time). Notice that the sampling rate is the same in this slide as it was with the lower frequency analog signal. This point will be important to understand the upcoming slides. This slide represents the digital signal that resulted from sampling the analog signal. Note (as was the case with the previous lower frequency signal) that there is no information about what occurred between sampling times. This slide shows the results of when the digital signal is reconstructed. Now we can clearly see the effect of sampling a higher frequency signal too slowly. Notice how the reconstructed signal has the basic trend of the original analog signal, but does not faithfully reproduce the quick variations (higher frequency components) of the signal.