Q1.2

Question 1

what is y(n) = 4 x(n)

Answer 1

amplification

Question 2

what is y(n) = x(4n)

Answer 2

down sampling

Question 3

do analog signal x(t) and digital signal x(n) have a similar waveshape

Answer 3

yes always

Question 4

Analog signal is _________ time, ___________ value

Answer 4

Analog signal is
CONTINUOUS in time,
CONTINUOUS in value

Question 5

desc. Input filter

Answer 5

anti-aliasing filter

Question 6

desc. ADC

Answer 6

Nyquist Sampling Theorem

Question 7

desc. Digital Processor

Answer 7

output and input related by a difference equation

Question 8

desc. DAC

Answer 8

produces high frequency signal

Question 9

desc. Output filter

Answer 9

anti-imaging filter

Question 10

Quantised signal is _________ time, ___________ value

Answer 10

Quantised signal is DISCRETE in time,
DISCRETE in value

Question 11

what is an output filter

Answer 11

anti-imaging filter
removes high frequency and smoothens the signal from DAC output

Question 12

what is true about DAC

Answer 12

• output is staircase like analog signal
• reverse the process of ADC
• employs the sample and hold technique for conversion
• length of the digital output code dependent on number of bits of the ADC

Question 13

what is y(n) = x(n - 4)

Answer 13

time delay

Question 14

if Input signal to digital process is x(n),
output signal is y(n).
do they have the same waveshape

Answer 14

yes if the process done is amplification

Question 15

what is an input filter

Answer 15

anti-aliasing filter/ low pass filter
remove high frequency of analog signal before inputting to ADC

Question 16

Sampled signal is _________ time, ___________ value

Answer 16

Sampled signal is DISCRETE in time, CONTINUOUS in value