FM radio receiver and signal processing device used therein

An FM radio receiver for receiving a multiplex FM broadcast on which data are superimposed, the FM radio receiver comprising:

• a station selecting section for selecting a frequency signal of a requested broadcasting station from a received signal;
• a timing signal generating section for detecting a predetermined data position of superimposed FM data included in the multiplex FM broadcast being received and generating a station change timing signal based on the predetermined data position;
• and
• a station selecting control section for permitting the frequency signal in the station selecting section to change from a current broadcasting station to the requested broadcasting station, which is synchronized with the current broadcasting station, according to a station change request signal requesting a change of the broadcasting station and the station change timing signal when the predetermined data position is detected,
• wherein the station selecting section generates a frequency signal based on a station data signal corresponding to the requested broadcasting station, and the station selecting control section supplies to the station selecting section the station data signal which is created based on the station change request signal, in response to the generation of the station change timing signal, and wherein the station selecting control section has a plurality of flip-flop circuits, the respective flip-flop circuits outputting the station data to the station selecting section when the station data signal is supplied to the data terminal of the respective flip-flop circuits, and the station change timing signal is supplied to the clock terminal of the respective flip-flop circuits from the timing signal generating section.

An FM radio receiver for receiving a multiplex FM broadcast on which FM multiplex data are superimposed, the FM radio receiver comprising:

• a station selecting section for selecting a second FM station from a first FM station and demodulating FM multiplex data, in which each frame of the FM multiplex data having a plurality of blocks each block having a code at a predetermined location thereof for executing predetermined processing;
• a timing signal generating section for generating a station change timing signal in response to the code located in each block;
• and
• a station selection control section that detects, when a station change instruction for switching from the first FM station to the second FM station, both having synchronously superimposed FM multiplex data, is generated between two successive station change timing signals, the code immediately after generation of the station change instruction and switches from the first FM station to the second FM station in response to the station change timing signal,
• wherein an amount of NG blocks of FM multiplex data caused during the switching from the first FM station to the second FM station is minimized.

An FM radio receiver for receiving a multiplex FM broadcast on which FM multiplex data are superimposed, the FM radio receiver comprising:

• a station selecting section for selecting a demanded FM station;
• a timing signal generating section for generating a station change timing signal in synchronism with a predetermined data position of demodulated FM multiplex data;
• and
• a station selection control section for permitting the changeover of synchronized FM stations in synchronism with the station change timing signal after a station change instruction for switching to a different FM station is generated between two station change timing signals,
• wherein the station selecting section generates a frequency signal based on a station data signal corresponding to the different broadcasting station, and the station selecting control section supplies to the station selecting section the station data signal which is created based on a station change request signal, in response to the generation of the station change timing signal
• wherein the station selecting control section has a plurality of flip-flop circuits, the respective flip-flop circuits outputting the station data to the station selecting section when the station data signal is supplied to the data terminal of the respective flip-flop circuits, and the station change timing signal is supplied to the clock terminal of the respective flip-flop circuits from the timing signal generating section.