Digital Signal Processing Questions & Answers

Digital Signal Processing Questions & Answers digital signal processing involves _________________ - CORRECT ANSWER - different operations on numbers that represent a natural signal Every natural signal can be converted into a ____________ a.) sound b.) pattern of letters c.) sequence of numbers d.) stimulus - CORRECT ANSWER - c.) sequence of numbers Explain the conversion of an acoustic signal - CORRECT ANSWER - Analog to digital- I have a microphone that is picking up the acoustic analog signal and once that microphone vibrates, it is converted into digital (this conversion occurs at the receiver). I can take the digital signal and convert it back to analog- it is very similar to electric to acoustic and acoustic to electric conversion explain the Nyquist-Shannon Theorem - CORRECT ANSWER - the sampling rate should be at least twice the highest frequency in a sampled signal to ensure no loss of information during sampling How do the number of snapshots taken influence the representation of the original wave? - CORRECT ANSWER - The more snapshots, the more representative of the original signal How many bits make up a byte? - CORRECT ANSWER - 8 If given a sampling rate of 50,000 Hz, what would the signal frequency be? - CORRECT ANSWER - 25,000 Hz If given a signal frequency of 12,000 Hz, what would the sampling rate be? a.) 6,000 Hz b.) 24,000 Hz c.) 10,000 Hz d.) 20,000 Hz - CORRECT ANSWER - b.) 24,000 Hz In a hearing aid, digital signal processing takes place. What filters are used and why? - CORRECT ANSWER - Can set low pass filters that limits the upper frequency limits of the input signal to about 4000 to 6000 Hz (controls for acoustic feedback (whistling), noise suppression, and microphone response)