Hello Adnan Maybe an expensive broadband sound card is not required, an the SDR reception of Broadband FM can be simple. This is an idea:
1. Generate I/Q baseband signals (and center the oscillator in the middle of a broadcast channel); 2. Low pass filter these I/Q signals so that only the tuned broadcast channel is passed; 3. Quantize the filtered I/Q analog signal to a two 1-bit digital signal; 4. Sample the digital signal (at least at a rate of 2*(highest frequency of lowpass filter, or better oversample with a much higher rate) 5. Feed the 1-bit I/Q stream to PC (i.e. parallel port should be fast enough, or simple 1.5Mbps USB1.1 interface such as USBTiny is doing) 6. In PC pass I/Q stream to SDR application that is doing FM demodulation. In FM transmission there is always a carrier. This idea only passes the channel of interest. Therefore there is no need for much dynamic range; 1 bit should be enough. What do you think? Guido On 9/14/07, Adnan Yusuf <[EMAIL PROTECTED]> wrote: > > Okay so it all boils down to the simple fact that the soundcard is not > a good thing to consider when you want to receive FM stations.I am now > thinking of another option, Data Acquisition Card, can anyone out here > tell me what a good DAQ card would be(recommend at the inexpensive > side,but enough to achieve FM reception). > > Yours truly, > Adnan Yusuf > >
