DSPRX An application that can be used for the demodulation of different signals.
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DSPRX Tags

processor signal modulation signal processor process signal sound modulation demodulation program demodulation signals

DSPRX Description

DSPRX does all necessary signal processing for Direct conversion Receivers using IQ-mixer for demodulation. I and Q signal is fed into right/left channel of the sound card. The 90° phase shifting is done by the PC. Sideband suppression is done by adding or subtracting the shifted and unshifted signal components. The program allows when using a sampling rate of 48kHz a +/- 24kHz tuning range. When using a 7040.00kHz crystal (LXO) you can tune from 7016.0kHz to 7064.0kHz. There is no more problem with shifting a crystal, all is done by the signal processing in the PC. An Athlon 1000 and a sound card allowing 100kHz sampling rate will give you 100kHz tuning range out of a fixed crystal local oszilator. The spectral display will show the frequencies centered around the used LO. Tuning is done by moving the tune trackbar. The red lines will show the filter range. The bandwidth of the filters can be changed on the fly by moving the trackbars. Used XO-frequency can be set in the dspr.ini file. The sampling rate in this version is fixed to 32kHz. I will release a version, where you can set sampling rate up to 48kHz, if your computer is able to do this job at that rate. 32kHz will run on a 500MHz AMD. Amplitude balance and constant time delay between right/left channel can be trimmed. I run a very simple IQ-demodulator for 7040.0 kHz using two NE612 as IQ-Mixers.

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