What is the correct index to check how much my signal is affected after I apply some kind of algorithm on it?

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U. Dreher

You can think of a lot of indications:

SNR - regarding the difference between original signal and processed signal as the 'noise' with respect to the original signal
Loss of information (eg. via FFT)
etc.

There is no objective measure. I'd use something that is sensitive to the algorithm(s) applied - showing 'better' and 'worse' alrgorithms

Amandeep Singh

www.robots.ox.ac.uk/~gari/.../IOP_ECG_SQI_Clifford_et_al.pdf

-Signal-Quality Indices for the Electrocardiogram and Photoplethysmogram: Derivation and Applications to Wireless Monitoring

ieeexplore.ieee.org/iel7/6221020/6363502/06862843.pdf...

For the second part "How to find signal strength form SQI " you can see

-Measuring Parameters for speech quality in cellular networks ...

www.academia.edu/.../Measuring_Parameters_for_speech_quality...

-Drive-Test Basic Radio Parameter - TelecomStudy18

telecomstudy18.blogspot.com › GSM

What is signal quality index? is there any way to find signal strength form SQI? - ResearchGate. Available from: https://www.researchgate.net/post/what_is_signal_quality_index_is_there_any_way_to_find_signal_strength_form_SQI [accessed Jul 5, 2016].

Shruti Phutke

You may calculate the energy of the signal and find out how much energy is being preserved......It may help you

Eduardo Trutié-Carrero

Once you apply the compression algorithm, which I recommend you use wavelet shrinkage if the noise is white gaussian, I recommend you make the comparison of the spectral components.