# Networks, Signals and Systems [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 19 - 21 of 141

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### Passage

Comprehension:

A digital filter uses a digital processor to perform numerical calculations on sampled values of the signal. The processor may be a general purpose such as a PC or specialised DSP chip. The analog input signal must first be sampled and digitised using an ADC. The resulting binary numbers, representing successive sampled values of the signal, are transferred to the processor, which carries out numerical calculations on them. These calculations typically involve multiplying the input values by constants and adding the products together. The results of these calculations, which now represent sampled values of the filtered signal, are converted back to the signal using a DAC.

## Question 19 (1 of 3 Based on Passage)

Networks, Signals and Systems
Fourier Series and Fourier Transform Representations

Appeared in Year: 2018 (UGC-NET)

### Question

MCQ▾

An order recursive filter generally requires (December)

### Choices

Choice (4)Response

a.

N previous inputs and n previous outputs

b.

Previous inputs and n-previous outputs.

c.

Previous inputs and previous outputs.

d.

N-previous inputs and previous outputs.

## Question 20 (2 of 3 Based on Passage)

Networks, Signals and Systems
Fourier Series and Fourier Transform Representations

Appeared in Year: 2018 (UGC-NET)

### Question

MCQ▾

Read the following statements regarding digital filters: (December)

i. Its operation is determined by a program stored in the processor՚s memory.

ii. It cannot handle low frequency signal accurately.

iii. It can only be changed by redesigning the circuitry.

iv. It is extremely stable with respect to both time and temperature.

Which of the above statements are correct?

Choose the correct answer from the code given below:

### Choices

Choice (4)Response

a.

(iii) and (iv)

b.

(i) and (ii)

c.

(i) and (iv)

d.

(ii) and (iii)

## Question 21 (3 of 3 Based on Passage)

Networks, Signals and Systems
Fourier Series and Fourier Transform Representations

Appeared in Year: 2018 (UGC-NET)

### Question

MCQ▾

The order of a digital filter is defined as (December)

### Choices

Choice (4)Response

a.

The number of previous inputs and outputs used to calculate the current output of the filter

b.

The number of previous outputs used to calculate the current output of the filter

c.

The number of previous inputs used to calculate the current output of the filter

d.

The number of coefficients in the current output of the filter

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