Abstract: A receiving apparatus comprising: a frequency-fluctuation-detection unit to detect a frequency difference between a received and desired signals; a first-undesired-level-detection unit to output as a first-undesired level an amplitude-level-difference between the signals having passed through first-and-second-band-pass filters in the received signals; one or a plurality of second-undesired-level-detection units to output amplitude levels of signals having passed through third-and-fourth-band-pass filters in the received signals as second-and-third-undesired levels, respectively, and output a sum of the second-and-third-undesired levels as a fourth-undesired level; and a determination unit to determine whether an undesired state, where an adjacent-undesired signal is present, occurs according to the fourth-undesired level if an absolute value of the frequency difference is equal to or greater than a predetermined-reference value, and select any one of the first-to-third-undesired levels to be outputted accordi

Abstract: A band-switch control apparatus for an intermediate-frequency filter comprising: an adjacent interference-signal detecting unit for detecting an adjacent interference-signal, having a frequency adjacent to the desired frequency, superimposed on a reception signal having a frequency tuned to a desired frequency; a modulation-degree detecting unit for detecting a modulation degree of the reception signal; a bandwidth selecting unit for selecting a pass bandwidth of the intermediate-frequency filter corresponding to the amplitude of the adjacent interference-signal; and a band-narrowing suppression control unit for selecting a lower limit value of the pass bandwidth of the intermediate-frequency filter corresponding to the demodulation degree, the intermediate-frequency filter for passing, with a variable pass bandwidth, an intermediate-frequency signal obtained by frequency converting the reception signal, and changing the pass bandwidth selected by the bandwidth selecting unit to the lower limit value, if the

Abstract: A receiving apparatus comprising: a frequency-fluctuation-detection unit to detect a frequency difference between a received and desired signals; a first-undesired-level-detection unit to output as a first-undesired level an amplitude-level-difference between the signals having passed through first-and-second-band-pass filters in the received signals; one or a plurality of second-undesired-level-detection units to output amplitude levels of signals having passed through third-and-fourth-band-pass filters in the received signals as second-and-third-undesired levels, respectively, and output a sum of the second-and-third-undesired levels as a fourth-undesired level; and a determination unit to determine whether an undesired state, where an adjacent-undesired signal is present, occurs according to the fourth-undesired level if an absolute value of the frequency difference is equal to or greater than a predetermined-reference value, and select any one of the first-to-third-undesired levels to be outputted accordi

Abstract: A multipass noise detecting apparatus comprising: a smoothing process unit configured to receive input of a signal corresponding to electric field strength of a received signal and to smooth the signal; a delay process unit configured to delay the signal; an amplifying unit configured to amplify a signal output from the smoothing process unit; a pulse noise determining unit configured to compare a signal output from the delay process unit with a signal output from the amplifying unit to output a pulse noise determining signal indicating a period of presence of pulse noise; and a noise cancel process unit configured to carry out a process for removing pulse noise on the basis of the pulse noise determining signal, the process being applied to the signal output from the delay process unit.

Abstract: A band-switch control apparatus for an intermediate-frequency filter comprising: an adjacent interference-signal detecting unit for detecting an adjacent interference-signal, having a frequency adjacent to the desired frequency, superimposed on a reception signal having a frequency tuned to a desired frequency; a modulation-degree detecting unit for detecting a modulation degree of the reception signal; a bandwidth selecting unit for selecting a pass bandwidth of the intermediate-frequency filter corresponding to the amplitude of the adjacent interference-signal; and a band-narrowing suppression control unit for selecting a lower limit value of the pass bandwidth of the intermediate-frequency filter corresponding to the demodulation degree, the intermediate-frequency filter for passing, with a variable pass bandwidth, an intermediate-frequency signal obtained by frequency converting the reception signal, and changing the pass bandwidth selected by the bandwidth selecting unit to the lower limit value, if the

Abstract: A noise canceler comprising: a first low-pass filter that a demodulated signal is to be input to; an interpolation processing unit that the demodulated signal after passing through the first low-pass filter and a pulse noise detection signal indicating presence of a pulse noise, are to be input to, the interpolation processing unit configured to perform interpolation processing on a demodulated signal present during a period determined by the pulse noise detection signal, out of the input demodulated signal, based on the input demodulated signal; a replacing processing unit that the demodulated signal subjected to the interpolation processing, the pulse noise detection signal, and the demodulated signal before passing through the first low-pass filter, are to be input to, the replacing processing unit configured to output a signal obtained by replacing a demodulated signal present during the period, out of the demodulated signal before passing through the first low-pass filter, with the demodulated signal sub

Abstract: A multipass noise detecting apparatus comprising: a smoothing process unit configured to receive input of a signal corresponding to electric field strength of a received signal and to smooth the signal; a delay process unit configured to delay the signal; an amplifying unit configured to amplify a signal output from the smoothing process unit; a pulse noise determining unit configured to compare a signal output from the delay process unit with a signal output from the amplifying unit to output a pulse noise determining signal indicating a period of presence of pulse noise; and a noise cancel process unit configured to carry out a process for removing pulse noise on the basis of the pulse noise determining signal, the process being applied to the signal output from the delay process unit.