QI: A voice message of 2 kHz is sampled at DM system for a rate nine times the Nyquet rate. The maximum signal amplitude is unity to avoid slop overload. Assuming the input signal amplitude is unity distribution in the range of (-1, 1) determine SNR?
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- Q:1. Suppose the signal contains frequencies up to 10 KHz. What is the minimum frequency of signal sampling that makes it possible to recover the signal after sampling? 2. If the channel has frequency bandwidth of 5 MHz. What is the smallest sampling period T which provides zero ISI ?Exxplain the rellation between BER and E/N_0, where E is the energy per bit,N_0 is the noise spectral density, BER is the bit error rate. What is the reason for usign channel coding?Digital communications Encoding and Decoding of Information Signal 1- Discuss the effect of varying the frequency of the sampling signal on the output.
- Q4. a) Consider a bandlimited message signal of 6kHz bandwidth. It is sampled at the rate of 55% higher than the Nyquist rate. The maximum quantization error of the sample amplitude is 0.5% of the peak amplitude? . Assume binary encoding. Calculate the minimum bandwidth ? of the channel to transmit the encoded binary signal.A 450 kHz carrier signal is modulated with a 15 kHz modulating signal. What are its sideband frequencies?1. What are the control methods for electromechanical systems. What arethe advantages of each method? 2. What are the design steps for a microcontroller basedelectromechanical system? 3. Given that sampling frequency (fs) is equal to 250Hz and Nyquistfrequency (fN) is equal to two times of the alias frequency, find the aliasfrequency. 4. You need to design a quantizer for a sensor which measures voltagevalues between 40 V and 200 V. If your resolution is 4 (n value) findthe number of output states (N) and quantization step (Q). 5. Design a capacitive transducer to be able to measure the displacementof a rotating element in a machine. Sketch the diagram and specifywhich parameters will let you measure the displacement.
- Q24)This multiple choice question from DIGITAL COMMUNICATIONS course.just write for me the final answer. The choice of the number of bits per PCM word depends on the a. SNR b. Bandwidth c. None of the mentioned d. SNR and bandwidthFor a PCM system, the value of the minimum transmission bandwidth is 25 kHz and the maximum frequency of the input waveform is 5 kHz. Estimate the total number of levels in the uniform quantizer present.To create a Pseudo Noise code of length 15 bits, how many shift registers are required? Techniques used in Wideband Modulation are: 1. Direct Sequence Spread Spectrum 2. Orthogonal frequency Division Multiplexing 3. 1 & 2 4. Frequency Hopping 5. 1, 2, &3
- The signal ?(?) = 5???(30?) + 10???(50?) is applied to the input of an ideal low-pass filter with cutoff frequency of ω . Determine the output, . ? = 40 ???/? ?(?)Question 3 3. A communication system transmits an analog waveform via a Yagi antenna of length 3m. The analog wave form is carrier modulated and transmitted over a Maray PAM system, where the number of pulse level is M = 64. The quantization distortion must not exceed ± 2% of the peak-to-peak analog signal. i What is the maximum number of bits per sample that should be used in this PCM? ii. What is the minimum sampling rate? iii. Determine the maximum frequency iv. What’s the resulting bit transmission rate? v. Compute the sampling timeAssume that a voice channel occupies a bandwidth of 4 kHz. We need to combine three voice channels into a link with a bandwidth of 12 kHz, from 20 to 32 kHz. Show the configuration, using the frequency domain. Assume there are no guard bands in computer communication and network?