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This question already has an answer here:

AFAIK both represent the ratio of the output response $Y(j\omega)$ to the input excitation $X(j\omega)$:

$$H(j\omega)=\frac{Y(j\omega)}{X(j\omega)}$$

Are there any difference?

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marked as duplicate by Matt L., Gilles, Marcus Müller, A_A, MBaz Sep 4 '16 at 22:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ The transfer function is more general because it can be the ratio of Laplace transforms of input and output. In the case of the frequency response, it is always assumed that it is a function of frequency only. $\endgroup$ – MBaz Sep 4 '16 at 18:53
  • $\begingroup$ A nice detailed answer explaining what is meant by frequency response. $\endgroup$ – Gilles Sep 4 '16 at 19:09