Radio receivers second webs and a method for demodulating both of broadband frequency moduli differential signals, as well as of narrow-band frequency modulated signals

摘要

Radio receiver for demodulating both of broadband frequency modulated signals, as well as of narrow-band frequency modulated signals, comprising:– a frequency by means of mounting means (30, 40) for converting a received frequency modulated signal in a fixed intermediate frequency signal;– a device (100, 110) to the wide band filters of the intermediate frequency signal with a first filter bandwidth, in order to generate a first filtered signal, wherein the first filter bandwidth in the 30 khz range for an advanced mobile phone service - amps - system is;– a device for demodulating the first filtered signal for extracting information;– a device (130, 140) for digitizing of the first filtered signal, wherein the means of a digital log amplitude and a digital phase, which together a complex number in the logpolar - form of each sample value, so as to form a current of complex numbers of the sampling values to generate;– a device for narrow band filters of the current complex instantaneous values, which a digital finite impulse response filter - fir - (190), in order to achieve a second filtered..