A. Diameter Modulation
B. Distance Modulation
C. Delta Modulation
D. None of the mentioned
Answer: C
The simplest form of differential predictive quantization is called delta modulation (DM).
A delta modulation (DM or Δ-modulation) is an analog-to-digital and digital-to-analog signal conversion technique used for the transmission of voice information where quality is not of primary importance.
12. In DM, the quantizer is a simple ________ bit and ______ level quantizer.
A. 2-bit, one-level
B. 1-bit, two-level
C. 2-bit, two-level
D. 1-bit, one level
Answer: B
The simplest form of differential predictive quantization is called delta modulation (DM). In DM, the quantizer is a simple 1-bit (two-level) quantizer.
13. In DM, What is the order of predictors is used?
A. Zero-order predictor
B. Second-order predictor
C. First-order predictor
D. Third-order predictor
Answer: C
In DM, the quantizer is a simple 1-bit (two-level) quantizer and the predictor is a first-order predictor.
14. In the equation xq(n)=axq(n-1)+dq(n), if a = 1 then integrator is called?
A. Leaky integrator
B. Ideal integrator
C. Ideal accumulator
D. Both Ideal integrator & accumulator
Answer: D
In the equation xq(n)=axq(n-1)+dq(n), if a = 1, we have an ideal accumulator (integrator).
15. In the equation xq(n)=axq(n-1)+dq(n), if a < 1 then integrator is called?
A. Leaky integrator
B. Ideal integrator
C. Ideal accumulator
D. Both Ideal integrator & accumulator
Answer: A
In the equation xq(n)=axq(n-1)+ dq(n), a < 1 results in a ”leaky integrator”.
A leaky integrator equation is a specific differential equation, used to describe a component or system that takes the integral of input, but gradually leaks a small amount of input over time.
16. What is the main function of (A/D) or ADC converter?
A. Converts Digital to Analog Signal
B. Converts Analog to Digital signal
C. All of the mentioned
D. None of the mentioned
Answer: B
The electronic device that performs this conversion from an analog signal to a digital sequence is called an analog-to-digital (A/D) converter (ADC).
17. What is the main function of (D/A) or DAC converter?
A. Converts Digital to Analog Signal
B. Converts Analog to Digital signal
C. All of the mentioned
D. None of the mentioned
Answer: A
A digital-to-analog (D/A) converter (DAC. takes a digital sequence and produces at its output a voltage or current proportional to the size of the digital word applied to its input.
18. The S/H is a digitally controlled analog circuit that tracks the analog input signal during the sample mode and then holds it fixed during the hold mode to the instantaneous value of the signal at the time the system is switched from the sample to the hold mode.
A. True
B. False
Answer: A
The sampling of an analog signal is performed by a sample-and-hold (S/H) circuit. The sampled signal is then quantized and converted to digital form.
Usually, the S/H is integrated into the (A/D. converter. The S/H is a digitally controlled analog circuit that tracks the analog input signal during the sample mode and then holds it fixed during the hold mode to the instantaneous value of the signal at the time the system is switched from the sample mode to the hold mode.
19. The time required to complete the conversion of Analog to Digital is ________ the duration of the hold mode of S/H.
A. Greater than
B. Equals to
C. Less than
D. Greater than or Equals to
Answer: C
The A/D converter begins the conversion after it receives a convert command. The time required to complete the conversion should be less than the duration of the hold mode of S/H.
20. In the A/D converter, what is the time relation between sampling period T and the duration of the sample mode and the hold mode?
A. Should be larger than the duration of sample mode and hold mode
B. Should be smaller than the duration of sample mode and hold mode
C. Should be equal to the duration of sample mode and hold mode
D. Should be larger than or equal to the duration of sample mode and hold mode
Answer: A
The A/D converter begins the conversion after it receives a convert command. The sampling period T should be larger than the duration of the sample mode and the hold mode.
