DSP-Characteristics of practical frequency selective filters

Which of the following is true about the characteristics of practical frequency selective filters?

• 1. They have an infinitely long impulse response
• 2. They have a finite impulse response
• 3. They have an all-pass transfer function
• 4. They have a linear phase response

What is the typical order of an infinite impulse response (IIR) filter?

• 1. First order
• 2. Second order
• 3. Third order
• 4. Fourth order

What is the primary advantage of using IIR filters compared to finite impulse response (FIR) filters?

• 1. Lower computational complexity
• 2. Higher frequency resolution
• 3. Better stopband attenuation
• 4. Linear phase response

The transfer function of an IIR filter can be expressed as a ratio of:

• 1. Impulse response and frequency response
• 2. Impulse response and transfer function of the corresponding FIR filter
• 3. Impulse response and step response
• 4. Impulse response and group delay

Which of the following is a common type of IIR filter?

• 1. Butterworth filter
• 2. Hamming filter
• 3. Blackman filter
• 4. Kaiser filter