10. Find the bandwidth for the following situations if we need to modulate a 8-KHz audio (note: B commonly =4) a. AM b. FM
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- b. Create your own function that runs the DTFT algorithm and returns coefficients of the Fourier transform. See notebook on Fourier DTFT. Apply the function to the following signals: 1) 6 sin(273t) + 3 sin(276t) 2) sin(273t) + cos(276t) and show the amplitude vs frequency plots.5- Write a C code that generates a 100 cycles only of waveform at variable frequency where the output frequency is given by: foutput = 5 + n Hz, where n is the Cycle Number n= 0,1, 2..... .99. The output is available from RB10. Given that Fcy = 50 MHz.4- Write a C code that generates 40 cycles only of waveform at 5 Hz. The output is available from RA2. Given that Fcy = 40 MHz.
- 163. In the case of Phase Modulation (PM), the value of beta (β) is a. Lower b. Greater c. 0 d. Infinity5. Frequency multiplier can be implemented practically by using a) Amplifier b) Capacity c) Nonlinear device junction d) Inductance. 6. The bandwidth of NBFM is approximately equal to a) fm b) 2fm c) 3fm d) 2ßfm 7. In Armstrong's indirect FM generation circuit, the mixer a) Changes the carrier frequency and the frequency deviation. b) Changes the carrier frequency keeping the frequency deviation without any changes. c) Changes the frequency deviation keeping carrier frequency without any changes. d) Keeping the carrier frequency and the frequency deviation without any changes. 8. The efficiency of AM-DSB modulator when the modulation index is one is equal to a) 50% b) 70% c) 33.3% d) 0% 9. Voltage controlled oscillator (VCO) is an oscillator that its frequency output is varied according to any change in the at its input. a) Frequency b) Current c) Voltage d) Wavelength 10. Matching of a transmission line with a characteristic impedance (Zo) and a load impedance (ZR) can be obtained…In FM modulation , the number of side bands produced depends on frequency deviation and carrier frequency. Select one: O True O False
- 8- Given the following parameters, calculate the noise margin of 74LS series. Parameter 74LS VIH(min) 2V V. IL(max) 0.8V VOH(min) 2.7V VOL(max) 0.4V03: Show the signals of the outputs fin the figure below as functions of the three inputs a. band e Use all eight possible combinations of a band e abcWhat is the Nyquist sampling rate for each of the following signals? a. A low-pass signal with bandwidth of 200 KHz? b. A band-pass signal with bandwidth of 200 KHz if the lowest frequency is 100 KHz?
- Consider a period of a signal is 12 µs , calculate the corresponding frequency: Select one: O a. 0.083333 Hz O b. 12 Hz O c. 83333 Hz O d. 12000 HzSupposing RC = 6 x 10-5, and W = 15 kHz. Calculate the improvement in the output signal-to-noise ratio (SNR) provided by the de-emphasis filter. Express it in decibel (dB).02: Suppose a signal illustrates below. This analog information signal has to be quantized using 8-bits per sample. Sketch quantized signal roughly with codeword. Amplitade Time