The project is work in progress and may be subject to change without notice. Spectrum and Waterfall signal realtime displayĪdded simple schematic (temporary hand writted) and the Help document to upload the firmware.Ī box for this project could be download from thingieverse as 3d Printed project.DNR with two stage (Spectral Subtraction + Adaptative Lms filters).Secondary display to Waterfall with 3kHz zoom.įirst version completed, final functions: The display of the spectrum of the signal received in 8kHz and one is also implemented The system uses the good performances offered by the stm32f4 processor based on the CortexM4 specification, thanks to DSP extensions it is possible to process 256-element FFT real time (bin) ensuring a good response on the DNR functionalities, filtering and visualization of the audio signal.įour filter elements have been implemented, currently fixed and implemented with Fir, with the following characteristics: This is an open source project that define a simple platform to make anĪudio DSP Processor for shortwave radio receiver with Digital Noise Reduction capabilities based on Spectral Subtraction. 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