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hi all, It is slightly different. I want to detect the 500 and 700 hz fsk signals at 600 baud. I use 8 khz sampling rate and do all the things as a buffered approach. This means I use two 8 k buffers and I process recorded buffer in the mean time recording in second buffer goes on in the background. I use goertzel algorithm to detect signal. I want to know how the samples from buffers are taken? I take a filter of 80 length. Everytime I shift 1 new sample into process buffer of 80 size.But actual samples are 14 and all the others are zeros. I compare two frequency energies and decide the bit value. Is it a correct method? it is not working.Please help me. and also suggest a correct method. hemant |
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fsk detection
Started by ●July 19, 2002
Reply by ●July 19, 20022002-07-19
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Try this link, may give you some idea how to implement a FSK demodulator http://www-k.ext.ti.com/SRVS/CGI-BIN/WEBCGI.EXE/,/?St`,E00000000004703951,K\ a77,Sxi=0,Case=obj(1796) I think it's a bit too close of the 500Hz and 700Hz FSK frequency though, specially the baud rate is 600. Ben --- hemant ramdasi <> wrote: > hi all, > It is slightly different. > > I want to detect the 500 and 700 hz fsk signals at > 600 > baud. > I use 8 khz sampling rate and do all the things as a > buffered approach. > This means I use two 8 k buffers and I process > recorded buffer in the mean time recording in second > buffer goes on in the background. > I use goertzel algorithm to detect signal. > > I want to know how the samples from buffers are > taken? > I take a filter of 80 length. > Everytime I shift 1 new sample into process buffer > of > 80 size.But actual samples are 14 and all the others > are zeros. > I compare two frequency energies and decide the bit > value. > > Is it a correct method? it is not working.Please > help > me. > and also suggest a correct method. > > hemant > > _____________________________________ > Note: If you do a simple "reply" with your email > client, only the author of this message will receive > your answer. You need to do a "reply all" if you > want your answer to be distributed to the entire > group. > > _____________________________________ > About this discussion group: > > To Join: Send an email to > To Post: Send an email to > > To Leave: Send an email to > Archives: http://www.yahoogroups.com/group/c54x > > Other Groups: http://www.dsprelated.com > ">http://docs.yahoo.com/info/terms/ ===== ___________________________________________________________ ~ ~ _/_/_/_/ _/_/_/_/ _/_/ _/ . . _/ _/ _/ _/ _/ _/ Benjamin Chan ' _/_/_/ _/_/_/ _/ _/ _/ [] o _/ _/ _/ _/ _/_/ _/_/_/_/ _/_/_/_/ _/ _/ __________________________________________________ |
