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- In 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.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 dispersionThe 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.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
- 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 258When an AM signal was displayed in a CRO, Vmax is measured as 7.2 V and Vmin measured as 2.9 V. 1. Draw the carrier and message signal separately 2. Determine the value of Vm and Vc 3. Determine the modulation index. 4. Suppose we can change the value of Vm. What is the maximum value that we could use for Vm without causing overmodulation?