Reduce interference from adjacent channels for receiver FM signals Digital Audio

摘要

1. method of receiving the digital fm signal u0430u0443u0434u0438u043eu0432u0435u0449u0430u043du0438u00a0, comprising the first set u043fu043eu0434u043du0435u0441u0443u0449u0438u0445 in the upper side of the radio and the second set p in the lower side of the u043eu0434u043du0435u0441u0443u0449u0438u0445 radio containing phases;u0441u043cu0435u0448u0435u043du0438u00a0 signal digital u0430u0443u0434u0438u043eu0432u0435u0449u0430u043du0438u00a0 signal heterodyne u0434u043bu00a0 u043fu043eu043bu0443u0447u0435u043du0438u00a0 signal intermediate frequency;;u043fu0440u043eu043fu0443u0441u043au0430u043du0438u00a0 intermediate frequency signal through a band pass filter u0434u043bu00a0 u043fu043eu043bu0443u0447u0435u043du0438u00a0 filtered signal.;u043eu043fu0440u0435u0434u0435u043bu0435u043du0438u00a0 u043du0430u043bu0438u0447u0438u00a0 u0438u0441u043au0430u0436u0435u043du0438u00a0 upper and lower side band signal of the digital u0430u0443u0434u0438u043eu0432u0435u0449u0430u043du0438u00a0; and;u043fu0440u0438u043bu043eu0436u0435u043du0438u00a0 u0441u043cu0435u0449u0435u043du0438u00a0 frequency to signal frequency heterodyne u0434u043bu00a0 u043eu0431u0435u0441u043fu0435u0447u0435u043du0438u00a0 u0438u0437u043cu0435u043du0435u043du0438u00a0 signal of intermediate frequency, in which the band pass filter u0443u0441u0442u0440u0430u043du00a0u0435u0442 under having its upper and lower side band.;2. method for 1, in which the phase u043eu043fu0440u0435u0434u0435u043bu0435u043du0438u00a0 u043du0430u043bu0438u0447u0438u00a0 u0438u0441u043au0430u0436u0435u043du0438u00a0 upper and lower side band signal of the digital u0430u0443u0434u0438u043eu0432u0435u0449u0430u043du0438u00a0 contains stages;u043fu0440u0435u043eu0431u0440u0430u0437u043eu0432u0430u043du0438u00a0 filtered signal into the digital signal.;u043fu0440u0435u043eu0431u0440u0430u0437u043eu0432u0430u043du0438u00a0 digital signal in the signals of the upper and lower fundamental frequency bands;;comparing the signals of the upper and lower fundamental frequency bands; and;the choice of u0441u043cu0435u0449u0435u043du0438u00a0 frequency on the basis of u0441u0440u0430u0432u043du0435u043du0438u00a0.;3. the way for phase 2, which u0441u0440u0430u0432u043du0435u043du0438u00a0 signals of upper and lower fundamental frequency bands includes stages;u0432u043eu0437u0432u0435u0434u0435u043du0438u00a0 in square signals of both the upper and lower fundamental frequency bands u0434u043bu00a0 u043fu043eu043bu0443u0447u0435u043du0438u00a0 built in a square signal upper lateral stripes and built in a lower side band signal.;built in the upper lateral quadrant signal filtering the filtered signal u0434u043bu00a0 u043fu043eu043bu0443u0447u0435u043du0438u00a0 upper side stripes;;built in filtering the square signal lower side bands u0434u043bu00a0 u043fu043eu043bu0443u0447u0435u043du0438u00a0 filtered signal lower side stripes; and;u0441u0440u0430u0432u043du0435u043du0438u00a0 filtered signal of upper side and lower side of the filtered signal.;4. the way for phase 3, in which the filtered signal u0441u0440u0430u0432u043du0435u043du0438u00a0 upper side and lower side of the filtered signal contains stages;if the output signal exceeds u043eu043fu0440u0435u0434u0435u043bu0435u043du0438u00a0, upper side of the lower side band signal with the first preset value; and;u043eu043fu0440u0435u0434u0435u043bu0435u043du0438u00a0 exceeds the lower side band signal if the output power signal of upper side stripes with the second preset rate.;5. method for paragraph 4, in which both the first and second raised rates u0441u043eu0441u0442u0430u0432u043bu00a0u044eu0442 1000.;6. method for 1, further containing phases;u043eu0446u0438u0444u0440u043eu0432u044bu0432u0430u043du0438u00a0 filtered signal u0434u043bu00a0 u043fu043eu043bu0443u0447u0435u043du0438u00a0 filtered digital signal.;u043fu0440u0435u043eu0431u0440u0430u0437u043eu0432u0430u043du0438u00a0 digital filtered signal in the signal bandwidth.;u0443u0441u0442u0440u0430u043du0435u043du0438u00a0 u0441u043cu0435u0449u0435u043du0438u00a0 frequency from the signal bandwidth.;7. method for p.6, in which the phase of the u0443u0441u0442u0440u0430u043du0435u043du0438u00a0 u0441u043cu0435u0449u0435u043du0438u00a0 frequency signal contains phase bandwidth;u043fu0440u0438u043bu043eu0436u0435u043du0438u00a0 negative u0437u043du0430u0447u0435u043du0438u00a0 u0441u043cu0435u0449u0435u043du0438u00a0 frequency to digital u043fu0440u0435u043eu0431u0440u0430u0437u043eu0432u0430u0442u0435u043bu044e to lower frequencies.;8. method for 1, in which the digital fm signal u0430u0443u0434u0438u043eu0432u0435u0449u0435u043du0438u00a0 took the band, the width of approximately 400 khz.;u0432u0435u0440u0445u043du00a0u00a0 u0431u043eu043au043eu0432u0430u00a0 runway distance from the centre of the channel approximately + 100 to + 200 khz.;u043du0438u0436u043du00a0u00a0 u0431u043eu043au043eu0432u0430u00a0 runway distance from the centre of the canal from about 100 khz to 200 khz bandwidth.;9. the receiver u0434u043bu00a0 fm reception signal digital u0430u0443u0434u0438u043eu0432u0435u0449u0430u043du0438u00a0, comprising the first set u043fu043eu0434u043du0435u0441u0443u0449u0438u0445 in the upper side of the radio and the second lotsa the government u043fu043eu0434u043du0435u0441u0443u0449u0438u0445 in the lower side of the radio containing;the mixer u0434u043bu00a0 u0441u043cu0435u0448u0435u043du0438u00a0 signal digital u0430u0443u0434u0438u043eu0432u0435u0449u0430u043du0438u00a0 heterodyne signal to intermediate frequency signal u043fu043eu043bu0443u0447u0435u043du0438u00a0;;filter for filtering the intermediate frequency signal u0434u043bu00a0 to u043fu043eu043bu0443u0447u0435u043du0438u00a0 filtered signal.;a u0434u043bu00a0 u043eu043fu0440u0435u0434u0435u043bu0435u043du0438u00a0 u043du0430u043bu0438u0447u0438u00a0 u0438u0441u043au0430u0436u0435u043du0438u00a0 upper and lower side band signal and a digital u0430u0443u0434u0438u043eu0432u0435u0449u0430u043du0438u00a0 u0434u043bu00a0 u0443u043fu0440u0430u0432u043bu0435u043du0438u00a0 heterodyne signal to ensure u0447u0435u043du0438u00a0 u0438u0437u043cu0435u043du0435u043du0438u00a0 frequency intermediate frequency signal, in which the band pass filter u0443u0434u0430u043bu00a0u0435u0442 u043fu043eu0434u043du0435u0441u0443u0449u0438u0435 in its upper and lower side band; and;a u0434u043bu00a0 processing the filtered signal to u043fu043eu043bu0443u0447u0435u043du0438u00a0 output signal.;10. the receiver on the p.9, which means u0434u043bu00a0 u043eu043fu0440u0435u0434u0435u043bu0435u043du0438u00a0 u043du0430u043bu0438u0447u0438u00a0 u0438u0441u043au0430u0436u0435u043du0438u00a0 upper and lower side band signal of the digital u0430u0443u0434u0438u043eu0432u0435u0449u0430u043du0438u00a0 contains;analog to digital converter u0434u043bu00a0 u043fu0440u0435u043eu0431u0440u0430u0437u043eu0432u0430u043du0438u00a0 filtered signal into the digital signal.;converter with lower frequency u0434u043bu00a0 u043fu0440u0435u043eu0431u0440u0430u0437u043eu0432u0430u043du0438u00a0 digital signal in the signals of the upper and lower fundamental frequency bands; and;a u0434u043bu00a0 u0441u0440u0430u0432u043du0435u043du0438u00a0 values signals of upper and lower main frequency bands.;11. the receiver on the p.10, which means u0434u043bu00a0 u0441u0440u0430u0432u043du0435u043du0438u00a0 values signals of upper and lower fundamental frequency bands contain;a u0434u043bu00a0 u0432u043eu0437u0432u0435u0434u0435u043du0438u00a0 in square and filtering the signals of both the upper and lower fundamental frequency bands u0434u043bu00a0 u043fu043eu043bu0443u0447u0435u043du0438u00a0 filtered signal the main floor the filtered signal is frequency and the bandwidth.;a first signal u0434u043bu00a0 u043fu043eu043bu0443u0447u0435u043du0438u00a0 u0441u043cu0435u0449u0435u043du0438u00a0 frequency if the filtered signal exceeds the upper side band filtered u0441u0438u0433u043du0430 the lower side of the first la specified rate or u043fu043eu043bu0443u0447u0435u043du0438u00a0 u0441u043cu0435u0449u0435u043du0438u00a0 second signal frequency.if the value of the filtered signal to the lower side of the upper side band filtered signal exceeds the second preset rate.;12. the receiver on the p.10, further containing;a u0434u043bu00a0 u043fu0440u0438u043bu043eu0436u0435u043du0438u00a0 negative u0437u043du0430u0447u0435u043du0438u00a0 first or second signal u0441u043cu0435u0449u0435u043du0438u00a0 frequency to u043fu0440u0435u043eu0431u0440u0430u0437u043eu0432u0430u0442u0435u043bu044e to lower frequencies.