6. ASK, PSK and FSK are examples of a. Digital to Analog c. Digtal to Digital conversion b. Analog to Digital d. Analog to Analog
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- What is the main feature in AM modulation , that is used to judge if the modulation is good or not ? Explain with examples .2. Digital signal is also compatible with multiplexing in what type? A. TDM B. FDM C. WDM D. All of the aboveIn Digital Modulation, a. the information is an analog and carrier is a digital signal b. both the information and carrier are analog signal c. both the information and carrier are digital signal d. the information is a digital and carrier is an analog signal.
- 3. Explain disadvantages of ASK modulation system.1- A modulation index of 0.5 would be same as a) 0.5 of Modulation Depth b) 1/2% of Modulation Depth c) 5% of Modulation Depth d) 50% of Modulation DepthChoose the correct answer low HDOP (Horizontal Dilution of Precision) number such as2 indicates a ........................... a.poor fix b.good fix c.poor signal quality d. good signal quality
- Which of the following is not an effect caused by multipath in radio channel? a) Rapid changes in signal strength b) Random frequency modulation c) Power of base station d) Time dispersion3. Define: a) The circuit that causes one signal to modulate another, and give the names of the two signals applied to this circuit. b) What is the name given to the new signals generated by the modulation process.2. Select the correct statement(s) regarding baseband signal modulation. a. modulation involves the mixing of a baseband signal with a carrier to produce a modulated carrier (passband) signal b. the modulation index gives us information regarding the quality of the modulated carrier signal c. FM and PM modulation techniques are categorized as “angular modulation”, while AM is not considered an “angular modulation technique d. all statements are correct
- The task of the modulator is: O a. Amplification of the analogue signal before transmission. O b. Converting digital symbols into analogue waveforms. O c. Decompresses the encoded digital signal. O d. Detects and possibly corrects error in the received digital data. O e. Detection of received digital symbols. O f. Introduces redundancy in the digital data to protect against error. g. Compresses the digital signal. O h. Amplification of the received signal with minimal noise.What is an MSDS?The information in an analog signal voltage waveform is to be transmitted over a PCM system with an accuracy of : 0.1 % of the peak-to-peak analog signal. The analog voltage waveform has a bandwidth of 43 Hz and an amplitude range of - 10 to 10 Vots. Determine the minimum bit rate fin bps) required in the PCM system? O a 688 O 774 O c 387 O d 86 Oe 258