Radio receiving device for measuring an electric field level of a receiving channel and adjacent channels using common components

A radio receiving device, comprising:

• a frequency converter for converting signals received on a receiving channel and adjacent channels of higher- and lower-frequencies than the receiving channel into IF signals;
• a band-pass filter for passing the IF signals on the receiving channel and the adjacent channels;
• an A/D converter for converting an output signal from said band-pass filter into a digital signal;
• and
• a digital signal processor for switching a frequency band to the receiving channel and the adjacent channels of the higher- and lower-frequencies, for sequentially switching the frequency band to the receiving channel and the adjacent channels on the higher- and lower-frequencies and calculating electric field levels of the received signals of the respective channels on the basis of digital signals output from said A/D converter,
• wherein said digital signal processor comprises:
• memory means for storing a digital received signal output from said A/D converter;
• a variable frequency digital filter for switching a frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies;
• switching control means for switching a pass band of said variable frequency digital filter to the receiving channel and the adjacent channels of higher- and lower-frequencies;
• a demodulator for demodulating a digital received signal passing through said variable frequency digital filter;
• and
• an electric field level measuring circuit for measuring an electric field level of a received signal on the basis of an output from said demodulator.

A radio receiving device comprising:

• a frequency converter for converting signals received on a receiving channel and adjacent channels of higher- and lower-frequencies than the receiving channel into IF signals;
• a band-pass filter for passing the IF signals on the receiving channel and the adjacent channels;
• an A/D converter for converting an output signal from said band-pass filter into a digital signal;
• and
• a digital signal processor for switching a frequency band to the receiving channel and the adjacent channels of the higher- and lower-frequencies, for sequentially switching the frequency band to the receiving channel and the adjacent channels on the higher- and lower-frequencies and calculating electric field levels of the received signals of the respective channels on the basis of digital signals output from said A/D converter,
• wherein said digital signal processor comprises:
• a variable frequency digital filter for switching a frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies;
• and
• an electric field level measuring circuit for measuring an electric field level of a received signal on the basis of a digital received signal passing through said variable frequency digital filter.

A radio receiving device, comprising:

• a frequency converter for converting signals received on a receiving channel and adjacent channels of higher- and lower-frequencies than the receiving channel into IF signals;
• a band-pass filter for passing the IF signals on the receiving channel and the adjacent channels;
• an A/D converter for converting an output signal from said band-pass filter into a digital signal;
• and
• digital signal processing means for switching a frequency band to the receiving channel and the adjacent channels of the higher- and lower-frequencies, for sequentially switching the frequency band to the receiving channel and the adjacent channels on the higher- and lower-frequencies and calculating electric field levels of the received signals of the respective channels on the basis of digital signals output from said A/D converter;
• wherein said digital signal processing means is a digital signal processor;
• wherein said digital signal processor comprises:
• memory means for storing a digital received signal output from said A/D converter;
• a variable frequency digital filter for switching a frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies;
• switching control means for switching a pass band of said variable frequency digital filter to the receiving channel and the adjacent channels of higher- and lower-frequencies;
• and
• an electric field level measuring circuit for measuring an electric field level of a received signal on the basis of a digital received signal passing through said variable frequency digital filter.

A radio receiving device, comprising:

• a first frequency converter for converting signals received on a receiving channel and adjacent channels of higher- and lower-frequencies than the receiving channel into first IF signals;
• a band-pass filter for passing the first IF signals on the receiving channel and the adjacent channels;
• a second frequency converter for converting an output signal from said band-pass filter into a second IF signal having a frequency lower than frequencies of the first IF signals;
• an A/D converter for converting said second IF signal output from said second frequency converter into a digital signal;
• and
• a digital signal processor for switching a frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies, for sequentially switching the frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies and calculating electric field levels of the received signals of the respective channels on the basis of digital signals output from said A/D converter,
• wherein said digital signal processor comprises:
• a variable frequency digital filter for switching a frequency band to the receiving channel and the adjacent channels on the higher- and lower-frequencies;
• a demodulator for demodulating a digital received signal passing through said variable frequency digital filter;
• and
• an electric field level measuring circuit for measuring an electric field level of a received signal on the basis of an output from said demodulator.

A radio receiving device comprising:

• a first frequency converter for converting signals received on a receiving channel and adjacent channels of higher- and lower-frequencies than the receiving channel into first IF signals;
• a band-pass filter for passing the first IF signals on the receiving channel and the adjacent channels;
• a second frequency converter for converting an output signal from said band-pass filter into a second IF signal having a frequency lower than frequencies of the first IF signals;
• an A/D converter for converting said second IF signal output from said second frequency converter into a digital signal;
• and
• a digital signal processor for switching a frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies, for sequentially switching the frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies and calculating electric field levels of the received signals of the respective channels on the basis of digital signals output from said A/D converter,
• wherein said digital signal processor comprises:
• memory means for storing a digital received signal output from said A/D converter;
• a variable frequency digital filter for switching a frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies;
• switching control means for switching a pass band of said variable frequency digital filter to the receiving channel and the adjacent channels of higher- and lower-frequencies;
• a demodulator for demodulating a digital received signal passing through said variable frequency digital filter;
• and
• an electric field level measuring circuit for measuring an electric field level of a received signal on the basis of an output from said demodulator.

A radio receiving device, comprising:

• a first frequency converter for converting signals received on a receiving channel and adjacent channels of higher- and lower-frequencies than the receiving channel into first IF signals;
• a band-pass filter for passing the first IF signals on the receiving channel and the adjacent channels;
• a second frequency converter for converting an output signal from said band-pass filter into a second IF signal having a frequency lower than frequencies of the first IF signals;
• an A/D converter for converting said second IF signal output from said second frequency converter into a digital signal;
• and
• a digital signal processor for switching a frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies, for sequentially switching the frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies and calculating electric field levels of the received signals of the respective channels on the basis of digital signals output from said A/D converter,
• wherein said digital signal processor comprises:
• a variable frequency digital filter for switching a frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies;
• and
• an electric field level measuring circuit for measuring an electric field level of a received signal passing through said variable frequency digital filter.

A radio receiving device, comprising:

• a first frequency converter for converting signals received on a receiving channel and adjacent channels of higher- and lower-frequencies than the receiving channel into first IF signals;
• a band-pass filter for passing the first IF signals on the receiving channel and the adjacent channels;
• a second frequency converter for converting an output signal from said band-pass filter into a second IF signal having a frequency lower than frequencies of the first IF signals;
• an A/D converter for converting said second IF signal output from said second frequency converter into a digital signal;
• and
• a digital signal processor for switching a frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies, for sequentially switching the frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies and calculating electric field levels of the received signals of the respective channels on the basis of digital signals output from said A/D converter,
• wherein said digital signal processor comprises:
• memory means for storing a digital received signal output from said A/D converter;
• a variable frequency digital filter for switching a frequency band to the receiving channel and the adjacent channels of higher- and lower-frequencies;
• switching control means for switching a pass band of said variable frequency digital filter to the receiving channel and the adjacent channels of higher- and lower-frequencies;
• and
• an electric field level measuring circuit for measuring an electric field level of a received signal on the basis of a digital received signal passing through said variable frequency digital filter.