In the figure below I want to know when is it possible to swap expander and compressor so that the outputs remain the same?

I know in general it's not possible to interchange because neither expander nor compressor are TI but I know in some cases it's possible.

  • 2
    $\begingroup$ Don't you want to swap the down-sampler and the up-sampler in the second picture? Currently the two block diagrams are identical so yo have automatically $y_a = y_b$ $\endgroup$
    – Hilmar
    Jul 24 '20 at 11:21
  • $\begingroup$ @Hilmar, thank you :), I made a mistake, i changed it. $\endgroup$ Jul 24 '20 at 11:26
  • 1
    $\begingroup$ As said, these are down/upsampling or decimation/interpolation; expanding and compression are different things, as far as I know. In which context did you see these two terms used? $\endgroup$ Jul 24 '20 at 13:24
  • $\begingroup$ @MarcusMüller, this names is used by oppenheim in his book. $\endgroup$ Jul 24 '20 at 13:43
  • $\begingroup$ Oppenheim's Signals and Systems or Discrete-Time signal processing? Could you tell me the chapter, please? $\endgroup$ Jul 24 '20 at 13:55

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