Q1. Choose the correct answer 1. With fixed number of quantization levels in PCM, the quantization noise is (linearly proportional to signal amplitude, non-linearly proportional to signal amplitude, linearly proportional to signal frequency, non-linearly proportional to signal frequency). 2. A PCM encoder uses 130 quantization levels. Which of the following N bits is more economical to encode such signal? (N=6, N=7, N=9, N=10). 3. Frequency Shift Keying can be accomplished by _multiplying two On-Off Keying signals, combining two Frequency Shift Keying signals, adding two (adding two On-Off Keying signals, Frequency Shift Keying signals). 4. Which of the following statements is true with respect to PCM? (The parallel binary data is converted into serial before transmission, Analog data is transmitted directly, Analog signal is amplified before transmission, The analog signal is converted into parallel binary data before transmission). 5. A baseband speech signal of maximum frequency of 4 kHz is encoded using PCM encoder, if the signal value dynamic range is [-3V,3V] and the difference between each two levels is 10mV. The minimum bandwidth is (36 kHz, 36.915 kHz, 40 kHz, 42 kHz) DV 6. rate is always less than or equal to rate. (Baud; bit, Bit; baud, Baud; base, Base; baud) 7. If a 32-QAM modulated signal has a baud rate of 2000, the bit rate is bps. (16000, 10000, 4000, 1000). 8. A 128-QAM modulated signal has a baud rate of 2000, there are bits per baud. (14000,1000, 6, 7). 9. In modulation, the baud rate is ⁄4 times the bit rate. (4-QAM, 2-PSK, 4-PSK, None of them). 10. A PCM codeword of N bits has bits that describe the magnitude of the information signal. (Log2N, 2N, N-1, N+1) 11. As the value of x increases in a Marcom function Q(x), the value of the function decreases, converge to the value of x, oscillates between 0 an x). (increases, 12. If four equiprobable signals -5, -1, 1, and 2 volts, are affected by AWGN with variance of 0.6, the highest error probability is 7. (between -5 and 2, between -5 and -1, between 1 and 2, between -1 and 1).

Q1. Choose the correct answer 1. With fixed number of quantization levels in PCM, the quantization noise is (linearly proportional to signal amplitude, non-linearly proportional to signal amplitude, linearly proportional to signal frequency, non-linearly proportional to signal frequency). 2. A PCM encoder uses 130 quantization levels. Which of the following N bits is more economical to encode such signal? (N=6, N=7, N=9, N=10). 3. Frequency Shift Keying can be accomplished by _multiplying two On-Off Keying signals, combining two Frequency Shift Keying signals, adding two (adding two On-Off Keying signals, Frequency Shift Keying signals). 4. Which of the following statements is true with respect to PCM? (The parallel binary data is converted into serial before transmission, Analog data is transmitted directly, Analog signal is amplified before transmission, The analog signal is converted into parallel binary data before transmission). 5. A baseband speech signal of maximum frequency of 4 kHz is encoded using PCM encoder, if the signal value dynamic range is [-3V,3V] and the difference between each two levels is 10mV. The minimum bandwidth is (36 kHz, 36.915 kHz, 40 kHz, 42 kHz) DV 6. rate is always less than or equal to rate. (Baud; bit, Bit; baud, Baud; base, Base; baud) 7. If a 32-QAM modulated signal has a baud rate of 2000, the bit rate is bps. (16000, 10000, 4000, 1000). 8. A 128-QAM modulated signal has a baud rate of 2000, there are bits per baud. (14000,1000, 6, 7). 9. In modulation, the baud rate is ⁄4 times the bit rate. (4-QAM, 2-PSK, 4-PSK, None of them). 10. A PCM codeword of N bits has bits that describe the magnitude of the information signal. (Log2N, 2N, N-1, N+1) 11. As the value of x increases in a Marcom function Q(x), the value of the function decreases, converge to the value of x, oscillates between 0 an x). (increases, 12. If four equiprobable signals -5, -1, 1, and 2 volts, are affected by AWGN with variance of 0.6, the highest error probability is 7. (between -5 and 2, between -5 and -1, between 1 and 2, between -1 and 1).

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter25: Television, Telephone, And Low-voltage Signal Systems

Section25.3: Signal System

Problem 1R

See similar textbooks