# Is possible to perform algebric operation with bitwise operations in PDM domain?

I have to compute the some operations (say sum and subtraction) between 2 signals. I have data in PDM domain: x1_pdm(t)=[0101011....]; and x2_pdm(t)=[0101011....]; What I do now is: convert x1_pdm and x2_pdm in PCM domain (low pass filter and decimation factor M=64) and that compute the sum and difference (or any other operation). Is it possible to perform this sum and sub in PDM domani with bitwise operation ? and then compute one pdm to pcm conversion... thank you mattia

• What on earth is meant by x1_pdm(t)=[0101011....]; and x2_pdm(t)=[0101011....];? Are the bits to be interpreted as a binary integer that tells us how wide the PDM pulse is? – Dilip Sarwate Sep 2 '14 at 13:22
• x1_pdm(t)=[0101011....] is the pdm stream out out the sigma delta modulator. – user3246711 Sep 15 '14 at 20:30