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What are the conditions for distortion less transmission through a system?

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Distortionless transmission requires: \[ |H(\omega)|=\text{constant} \] and \[ \phi(\omega)=-\omega t_0 \] (Constant magnitude + Linear phase)

Updated On: Jun 25, 2026

Gain is linear and phase is constant
Gain and phase should be linear
Gain and phase must be constant
Gain must be constant and phase should be linear

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The Correct Option is D

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Top Questions on communication systems

The percentage of the total power carried by the sidebands of the AM wave for tone modulation when the modulation index is 0.3 is:
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Match List-I with List-II:

List-I (Modulation Schemes)	List-II (Wave Expressions)
(A) Amplitude Modulation	(I) \( x(t) = A\cos(\omega_c t + k m(t)) \)
(B) Phase Modulation	(II) \( x(t) = A\cos(\omega_c t + k \int m(t)dt) \)
(C) Frequency Modulation	(III) \( x(t) = A + m(t)\cos(\omega_c t) \)
(D) DSB-SC Modulation	(IV) \( x(t) = m(t)\cos(\omega_c t) \)

Choose the correct answer:

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