USB RF front-end of the DRM receiver under LabView API environment

DRM (Digital Radio Mondiale) system uses software decoding what enables simpler RF front-end. DRM signal is a digital signal for radio broadcast on frequency bands below 30 MHz. The proposed USB RF front-end is designed to work with existing DRM software which uses soundcard as ADC between RF front-end and DRM decoding software. DAC of the decoded digital signal and audio reproduction is realized by PC integrated soundcard, while PWM (Pulse Width Modulation) used for frequency control of local oscillator uses DAC on external USB soundcard. In order to have a single software application, the existing DRM software is embedded in LabView environment which is developed for RF front-end control.