(a) The analog signal r(t) = sin(607t) is sampled at 20 Hz. Derive and write down an expression for the sampled signal r[n]. What is the Nyquist frequency for this x(t)?

A signal is represented in the frequency domain by the figure below. If it is sampled at 100Hz, F(w) -50 0 50 w(rad/s) a. Sketch the sampled signal in the frequency domain. Pay attention to UNITS (5)

An electronic stethoscope is to be designed to operate within a full frequency range of 20 Hz to 20kHz. The accepted frequency range of human heart sounds is about 20Hz to 200Hz while that of the human lung sounds is about 25Hz to 1500Hz. Design an RC active bandpass filter circuits that could be implemented in a device to process signals that are captured from the heart sounds and the lungs sounds. Assume the voltage signals from the heart sounds from the transducer is 20mV and the desired output voltage is 5V. Use the non-inverting amplifier for your design.

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Signal Flow Graphs Derive the transfer function for the signal flow graph shown Figure 8. Y1 H5 H, 1 H Y H, H3 13 Y5 H4 Figure 8: Signal flow graph

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Compute the eight-point DFT of the sequence x(n) using radix-2 decimation-in-time. Follow exactly the corresponding signal flow graphs and keep track of all the intermediate quantities by putting them on the diagram. x(n)=1/2.sin(pie/4.n),0<=n<=?

need help - nyquist and sampling process

The spectrum associated with Step signal 7 The spectrum associated with an impulse signal 10 Choice aoption The spectrum associated with an exponential signal The spectrum associated with rectangular signal