Anna University Regulation 2013 Information Technology (IT) CS6304 ADC 2marks & 16marks for all 5 units are provided below. Download link for IT 3rd SEM CS6304 Analog and Digital Communication Short answers, Question Bank are listed down for students to make perfect utilization and score maximum marks with our study materials.
UNIT III — DATA AND PULSE COMMUNICATION
1. State the sampling theorem for band-limited signals of finite energy.
If a finite energy signal g(t) contains no frequency higher than W Hz, it is completely determined by specifying its ordinates at a sequence of points spaced 1/2W seconds apart.
2. What are the advantages of digital transmission?
i. The advantage of digital transmission over analog transmission is noise immunity. Digital pulses are less susceptible than analog signals to variations caused by noise.
ii. Digital signals are better suited to processing and multiplexing than analog signals.
iii. Digital transmission systems are more noise resistant than the analog transmission systems.
iv. Digital systems are better suited to evaluate error performance.
3. What are the disadvantages of digital transmission?
i. The transmission of digitally encoded analog signals requires significantly more bandwidth than simply transmitting the original analog signal.
ii. Analog signal must be converted to digital codes prior to transmission and converted back to analog form at the receiver, thus necessitating additional encoding and decoding circuitry.
4. Define pulse code modulation.
In pulse code modulation, analog signal is sampled and converted to fixed length, serial binary number for transmission. The binary number varies according to the amplitude of the analog signal.
5. What is the purpose of the sample and hold circuit?
The sample and hold circuit periodically samples the analog input signal and converts those samples to a multilevel PAM signal.
6. What is the Nyquist sampling rate?
Nyquist sampling rate states that, the minimum sampling rate is equal to twice the highest audio input frequency.
7. What is the principle of pulse modulation?
Pulse modulation consists essentially of sampling analog information signal and then converting those discrete pulses and transporting the pulses from a source to a destination over a physical transmission medium.
8. List the four predominant methods of pulse modulation.
i. Pulse width modulation (PWM)
ii. Pulse position modulation (PPM)
iii. Pulse amplitude modulation (PAM)
iv. Pulse duration modulation (PDM)
9. What is codec?
An integrated circuit that performs the PCM encoding and decoding functions is called a Codec (coder/decoder).
10. Define and state the causes of fold over distortion.
The minimum sampling rate (fs) is equal to twice the highest audio input frequency (fa). If fs is less than two times fa, distortion will result. The distortion is called aliasing or fold over distortion. The side frequencies from one harmonic fold over into the sideband of another harmonic. The frequency that folds over is an alias of the input signal hence, the names “aliasing” or “fold over distortion”.
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Anna University 3rd SEM IT ADC 2marks 16 marks
CS6304 Analog and Digital Communication question bank free download
Anna University IT ADC short answers Regulation 2013
CS6304 2marks, ADC Unit wise short answers – IT 3rd Semester