Digital communications Encoding and Decoding of Information Signal 1- Discuss the effect of varying the frequency of the sampling signal on the output.
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Digital communications
Encoding and Decoding of Information Signal
1- Discuss the effect of varying the frequency of the sampling signal on the output.
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- 1. What are the advantages of sampling analog signals?What do you mean by fractional sampling rate conversion? Explain with an example of converting 48 kHz signal to 44.1 kHz signal using multi-stage fractional sampling rate converter4. Signal conditioning element basically takes the output of the sensing element and converts it into a form more suitable for further processing, usually in the form of a DC voltage, DC current or variable frequency AC voltage. The output of the sensing element is usually too small to operate an indicator or a recorder. Therefore, it is suitably processed and modified in the signal conditioning element so as to obtain the output in the desired form that is amplify the signal and filtering the unwanted signal. i. Describe the aliasing phenomenon. ii. Suggest a solution to minimize the effect of aliasing.
- 5- Discuss the effect of changing the number of bits on the recovered analog waveform. 6- Discuss the effect of changing the frequency of input analog signal on the reconstructed analog output signal.2a. Assume a digital to analog conversion system uses a 10-bit integerto represent an analog temperature over a range of -25oF to 125oIf the actual temperature being read was 65.325oF, what would bethe closest possible value that the system could represent? 2b. What is the minimum sampling rate needed in order to successfullycapture frequencies up to 155 KHz in an analog signal?1. a) An analog signal contains frequencies up to 12 kHz. (i) What range of sampling frequencies dose allow exact reconstruction of this signal from its samples? (ii) Suppose that we sample this signal with a sampling frequency Fs = 9 kHz. Examine with proper diagram what happens to the frequency component F1 = 6 kHz after passing through the digital to analog converter. (iii) Repeat part (ii) for a frequency component F2 = 11 kHz. b) Why is it necessary to introduce an analog low-pass filter before analog to digital converter? Illustrate the fact with necessary diagram.
- What do you mean by fractional sampling rate conversion? Explain with an example of converting 48 kHz signal to 44.1 kHz signal using multi-stage fractional sampling rate converter. (ii) What are the effects of finite word length in digital filters3. Discuss the effect of changing the frequency of input analog signal on the reconstructed analog output signal.What is the physical meaning of sampling theorem? And Write down the corresponding expressions for low-pass analog signals and band pass analog signals. What happens if the sampling theorem is not satisfied when sampling an analog signal?
- Which statement is not true for a source encoder? a.reduces the size of the data b.Converts analog information to discrete signal c.Removes redundancy d.Converts digital input to pulsating signalThe analog waveform is shown with an effective bit rate of 53000 bits per second. If the analog input is sampled at 8 samples per bit, determine the minimum sampling rate of an ADC converter in KHz.i. Describe the precaution you would take in selecting the sampling interval ii. How may the original signal recovered from the sampled signal?