PathPartner Technology DSP Software Engineer interview questions

First I had telephonic interview, asked about DMA, Cache, Video codecs etc., Then asked to appear for onsite interview. Onsite interview took for 4 hours. I was asked to write few C programs for matrices, bit manipulations etc., Then asked to explain about data compression, video compression etc.,

apptitude which includes technical skils & problem solving & verbal more question on compiler design dbms c programming, programming question basically from data structure, technical round on DS OS compiler design , hr round