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Bob Larkin has an alternative (better!) approach with cross-correlation which needs a simple hardware addition
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This is now in most cases detected by the automatic IQ phase correction algorithm and the codec restarted to cure the problem.
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filter coefficients are calculated by the Teensy itself and the filter bandwidth can be chosen arbitrarily by the user in 100Hz-steps (100Hz to 11kHz audio bandwidth).filtering with 257 tap FIR filter (equivalent to 2056 tap filtering because of decimation-by-8) -> comparably steep filters are normally available in commercial receivers from 2000$ upwards -).FFT and inverse FFT with 512 points using the new CMSIS DSP lib complex FFT function.
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Install a newer version of the ARM CMSIS DSP library and set it to use floating point (explained HERE: (Software-Defined-Radio)?p=129081&viewfull=1#post129081.Unzip and copy the following libraries into your Arduino folder (/Program Files/Arduino/hardware/teensy/avr/libraries):.antenna for longwave/mediumwave/shortwave.eight pushbuttons (three of them could be encoder pushbuttons).QSD = quadrature sampling detector and a local oscillator that can be tuned by I2C (eg.
#Elektor sdr reloaded software
Teensy Convolution SDR software running on the hardware designed by Dante DO7JBH Reception of longwave, medium wave and shortwave signals from about 12kHz to 30Mhz, additionally undersampling reception of FM broadcast signals 88 - 108MHz in HiFi quality and STEREO This radio uses the Fast convolution approach to filter and process the radio signals with the floating point microprocessor Teensy 3.6 Software Defined Radio with the Teensy 3.6, the Teensy Audio board and any IQ-Quadrature Sampling Detector