Adaptive bandwidth receiver

摘要

The receiver includes a superheterodyne section converting a received frequency modulated signal to a fixed intermediate frequency signal. The IF signal is then filtered and further filtered to produce respective wideband and narrowband signals. These are demodulated by a frequency discriminator. Pref. the narrowband filtering is done by an FIR filter whose bandwidth is varied as a function of adjacent channel interference levels. Pref. frequency discrimination and the narrow band filtering are implemented in a digital signal processor receiving digitised vector components of the wideband filtered IF signal.