초록 ▼

The location coordinates, as well as the transmitting station frequencies, of stations that broadcast the same programs by network arrangements or otherwise, are stored so that when a particular program (network) is selected, all these stations broadcasting the same program as a station being listen

The location coordinates, as well as the transmitting station frequencies, of stations that broadcast the same programs by network arrangements or otherwise, are stored so that when a particular program (network) is selected, all these stations broadcasting the same program as a station being listened to which are not more than a prescribed maximum distance from the station being listened to, may be listed in a table in a working store. While a particular station is being listened to, therefore, continuous checking of the station being listened to with other stations broadcasting the same program for relative reception quality can be carried out automatically while a station is being listened to in a moving vehicle, without taking into account the signals broadcast by stations that are too far away. As soon as some other station broadcasting the same program is found to provide better reception, it is automatically tuned in, and from then on the distance criterion is referred to the location of the new station, a new set of stations for signal comparison is selected and the comparative signal checking process is continued automatically.

대표청구항 ▼

Mobile radio broadcast receiver for automatically tuning from one to another of VHF or UHF stations broadcasting a network program as the receiver is carried, in a vehicle, away from the service area of the station to which it was most recently tuned, comprising: tuning means for initially tuning th

Mobile radio broadcast receiver for automatically tuning from one to another of VHF or UHF stations broadcasting a network program as the receiver is carried, in a vehicle, away from the service area of the station to which it was most recently tuned, comprising: tuning means for initially tuning the receiver to a station that broadcasts a network program, for maintaining reception of said station until said means are controllably switched over to tuning another station and thereafter for maintaining said receiver tuned to said other station; fixed information storage means for storing frequency assignments and transmitter location coordinates of stations receivable by the receiver in their respective service areas along with identification of networks of which the programs are broadcast by the stations of which the frequencies and coordinates are stored; means for reading out of said fixed information storage means the frequency assignments and location coordinates stored therein for the stations that broadcast the same network program as the station in which the receiver is contemporaneously tuned to receive; distance discriminating means including distance calculating and distance comparing means for selecting from the output of said reading out means the read-out frequency assignments of only those stations of which the transmitter locations are at a distance from the transmitter location of said station which the receiver is contemporaneously tuned to receive, which distance does not exceed a predetermined maximum distance, and for storing said selected frequency assignments in a working temporary store; means for comparing the quality of reception of said station which the receiver is contemporaneously tuned to receive, successively, with the available reception quality of the stations of which the frequency assignments are stored in said working store, and means, responsive to determination by said comparing means that reception of a station of which the frequency assignment is stored in said working store is available with better quality than reception of said station in which the receiver is contemporaneously tuned to receive, for switching over said tuning means so as to tune the receiver for reception of said station, the reception of which has been found to be available with better quality.