초록 ▼

A frequency modulation receiving apparatus comprises a signal-converting circuit for converting a signal received by an antenna into a signal consisting of wave clusters having various frequencies, first limiting circuit for limiting those of the wave clusters which have frequencies outside a first

A frequency modulation receiving apparatus comprises a signal-converting circuit for converting a signal received by an antenna into a signal consisting of wave clusters having various frequencies, first limiting circuit for limiting those of the wave clusters which have frequencies outside a first frequency range, second limiting circuit for limiting those of the wave clusters which have frequencies outside a second frequency range narrower than the first frequency range, shearing circuit for combining and outputting a ratio of a signal output by the first limiting circuit and a signal output by the second limiting circuit, frequency-demodulating circuit for frequency-demodulating a signal output by the selecting circuit, detecting circuit for detecting whether or not an adjacent interfering wave exists in a signal output by the frequency-demodulating circuit, and for outputting a signal indicating whether or not an adjacent interfering wave exists in the signal, and control circuit for delaying a signal output by the detecting circuit and supplying the signal to the selecting circuit, thereby to control the selecting circuit.

대표청구항 ▼

A frequency modulation receiving apparatus comprising: means for converting a signal received by an antenna into a signal consisting of wave clusters having various frequencies; first limiting means for limiting those of the wave clusters which have frequencies outside a first frequency range; secon

A frequency modulation receiving apparatus comprising: means for converting a signal received by an antenna into a signal consisting of wave clusters having various frequencies; first limiting means for limiting those of the wave clusters which have frequencies outside a first frequency range; second limiting means for limiting those of the wave clusters which have frequencies outside a second range narrower than the first frequency range; means for receiving a first signal output from the first limiting means and a second signal output from the second limiting means, and for outputting the first and second signals in a changeable ratio in accordance with a ratio control signal; means for frequency-demodulating the signal output from the signal-receiving and outputting means; means for detecting whether or not an adjacent interfering wave exists in the signal output from the frequency-demodulating means when the signal-receiving and outputting means receives and outputs the first signal output from the first limiting means; means for measuring a predetermined time period when the first signal-receiving and outputting means has started outputting the second signal; and means for outputting the ratio control signal so that the signal-receiving and outputting means outputs the first and second signals in a predetermined ratio in an initial state just after power on, changes the changeable ratio to increase a value of the second signal when the detecting means detects the adjacent interfering wave exist in the signal output from the frequency de-modulating means, maintains the changeable ratio until the measuring means has measured the predetermined time period, even when the detecting means that the adjacent interfering wave does not exist in the signal output from the frequency-demodulating means, and changes the changeable ratio to increase a value of the first signal regardless a result of detection by the detecting means when the measuring means has measured the predetermined time period.