Signal Processing Interview Questions and Answers for Freshers

Yes, the resultant wave will be periodic with a period equal to the least common multiple of the two frequencies.

• The period of the resultant wave is determined by the least common multiple of the two frequencies.

• If the frequencies are incommensurable, the resultant wave will not be periodic.

• If the frequencies are harmonically related, the resultant wave will have a period equal to the fundamental period of the lower frequency.

• The amplitude and phase of the resultant wave will...read more

Sampling a sine wave at 1.5 times its original frequency retains the original wave.

• The original wave can be reconstructed using interpolation techniques.

• The Nyquist-Shannon sampling theorem states that a signal can be perfectly reconstructed if it is sampled at twice its highest frequency component.

• Sampling at 1.5 times the original frequency satisfies the Nyquist-Shannon sampling theorem.

• This technique is used in digital audio processing.

Odd harmonics represent asymmetry in a signal while even harmonics represent symmetry.

• Odd harmonics are multiples of the fundamental frequency and have a phase shift of 90 degrees.

• Even harmonics are also multiples of the fundamental frequency but have a phase shift of 0 degrees.

• Odd harmonics represent the asymmetry in a signal, while even harmonics represent the symmetry.

• For example, a square wave has odd harmonics only, while a triangle wave has both odd and even harmonics.

Fourier series is a mathematical representation of a periodic function as a sum of sine and cosine functions.

• Fourier series is used to analyze and synthesize periodic signals.

• It decomposes a periodic function into a sum of sine and cosine functions with different frequencies and amplitudes.

• The Fourier coefficients represent the amplitude and phase of each frequency component.

• The Fourier series can be used to approximate non-periodic functions by extending the function periodi...read more