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This was a prototyping project to see if I could capture PCM (pulse code modulated) data from my sound card - where the sound was encoded using an octal FSK (frequency shift keyed) method and then decode it. The application displays the captured waveform (amplitude / time domain), a frequency /time domain plot and frequency components using a fast fourier transformt (FFT) of a sampled portion of the original waveform. It also has a waterfall type frequency display which is generated from iterative FFTs over the complete waveform. Not only can the application capture and decode the PCM data - but it can also use an inverse fourier transform (fourier synthesis) to encode data to PCM. It even includes a method to synthesize noise on the generated PCM waveform. The intention is that this prototype will form the basis of an octal FSK encoder / decoder service that allows multiple client applications on a network to send and receive data over a radio channel. Developed in C# making use of DirectX DirectSound and the Exocortex.DSP (http://www.exocortex.org/dsp/) digital signal processing engine.
Octal FSK Decoder look great telling from the screenshot posted. Is there any possibility to download and test it for oneself? Many thanks and best regards, Ruben
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