Abstract: Method for reducing noise included in a stereo reproduction signal derived from a stereo input signal characterized by the steps of: *varying stereo channel separation of said stereo reproduction signal with frequency within the frequency range of the stereo input signal in accordance with the frequency response of a filter selectivity located around a center frequency to obtain a stereo channel separation peak value at said center frequency; *at a continuing increase of said noise, decreasing the bandwidth of said filter selectivity to a pre-determined non-zero bandwidth while maintaining the channel separation within the bandwidth of said filter selectivity substantially at said channel separation peak value.

Abstract: Receiver comprising an RF input filter including a digitally controlled capacitor bank with n capacitors being controlled by a tuning control signal for varying the tuning frequency of the RF input filter within a tuning range. For an improvement of the receiver in price/performance ratio the n capacitors of the digitally controlled capacitor bank are monolythically integrated, whereas the bandwidth of the tunable RF input filter is being adjusted to the maximum relative spread of said capacitors. A continuous tuning control signal is being supplied through an analogue to digital (AD) converter to said capacitor bank and to a first input of a differential stage, an output of the AD converter being coupled through a digital to analogue (DA) converter to a second input of a differential stage, an output of the differential stage being coupled to a control terminal of a variable capacitance diode being arranged in parallel to the digitally controlled capacitor bank.

Abstract: Receiver comprising a cascade of first to N resonance amplifiers (SA1, SA2, SA3), an output thereof being coupled to signal processing means (TO, SD, PK, LP1, S) for deriving a baseband modulation signal. To improve the signal to noise ratio said cascade is included in an RF input stage of the receiver for a distributed selective amplification of an RF reception signal, preferably with an impedance level of the individual resonance amplifiers within said cascade of first to N resonance amplifiers increasing in signal downstream direction.

Abstract: A reduction of the overall power loss in a resonance circuit is achieved by having excitation occur within excitation periods (Tex) of resonation periods (Tfre), during which the resonance circuit is in a free running resonance mode, the excitation periods being smaller than the resonation periods, to define an excitation duty cycle (Tex/Tcar) relative to the period of a carrier signal (Tcar) of less than 0.5. Preferably the resonance frequency (fres) of the resonance circuit is higher than the carrier frequency (fcar) of the modulated high frequency carrier signal over a resonance frequency detuning rate (dfres), defined by the frequency deviation of the resonance frequency from the carrier frequency relative to the carrier frequency (fres/fear-1), substantially at most corresponding to half the excitation duty cycle.

Abstract: Receiver comprising an RF input filter including a digitally controlled capacitor bank with n capacitors being controlled by a tuning control signal for varying the tuning frequency of the RF input filter within a tuning range. For an improvement of the receiver in price/performance ratio the n capacitors of the digitally controlled capacitor bank are monolythically integrated, whereas the bandwidth of the tunable RF input filter is being adjusted to the maximum relative spread of said capacitors. A continuous tuning control signal is being supplied through an analogue to digital (AD) converter to said capacitor bank and to a first input of a differential stage, an output of the AD converter being coupled through a digital to analogue (DA) converter to a second input of a differential stage, an output of the differential stage being coupled to a control terminal of a variable capacitance diode being arranged in parallel to the digitally controlled capacitor bank.

Abstract: Receiver comprising a cascade of first to N resonance amplifiers (SA1, SA2, SA3), an output thereof being coupled to signal processing means (TO, SD, PK, LP1, S) for deriving a baseband modulation signal. To improve the signal to noise ratio said cascade is included in an RF input stage of the receiver for a distributed selective amplification of an RF reception signal, preferably with an impedance level of the individual resonance amplifiers within said cascade of first to N resonance amplifiers increasing in signal downstream direction.