Simon, >Why must the sampling frequency be 11025? because the Fourier is done with 2048 samples at 11025 samples/sec. At 8000, the number of samples would not be a power of 2 and this Fourier could not be a FFT but a standard digital Fourier (DFT) which takes times to do. So the simplest way is to base all on 11025.
For more details, read the "RS_ID_English.doc" file in http://f6cte.free.fr/PAPERS.ZIP 73 Patrick ----- Original Message ----- From: Simon (HB9DRV) To: [email protected] Sent: Thursday, April 16, 2009 10:54 PM Subject: Re: [digitalradio] Mode of the Day? RS ID on SdR bandwidth Hi, Why must the sampling frequency be 11025? Simon Brown, HB9DRV www.ham-radio-deluxe.com ----- Original Message ----- From: Patrick Lindecker No problem, but I program in Pascal not in C...(Votjech did a C source). The sampling frequency must be 11025, but it is not a problem to work at 8000.
