JPH07202778A - Radio receiver - Google Patents

Abstract

PURPOSE:To receive an excellent broadcast by providing a 1st changeover device, a means detecting a reception level and a multi-path noise level and a comparator so as to select a broadcast station whose reception level is high and whose multi-path noise level is small. CONSTITUTION:When a reception level of a signal received by a 1st front end 4a is smaller than that of a signal received by a 2nd front end 4b and when a multi-path noise level of the signal received by the 1st front end 4a is higher than that of the signal received by the 2nd front end 4b, a changeover device 9 is used to provide an output of a sound signal received by the front end 4b. Then a turner system 7 is controlled so as to allow the front end 4a to be turned successively to a broadcast station broadcasting the same program as the broadcast during the reception by the front end 4b. Furthermore, when the reception level of the signal selected by a comparator 8 is less than a set level or the multi-path noise level is over the set level, the antenna chanvgeover device 3 is controlled to switch and select the antenna 1b from the antenna 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver.

[0002]

2. Description of the Related Art Since a car radio is listened to while it is moving, it may be out of the service area of the broadcasting station that is receiving it, and the driver must retune to it each time. In particular, it appears remarkably in radio broadcasting such as FM broadcasting which has a relatively small service area. With respect to this problem, a receiver having two receiving systems is used to search for a broadcasting station that is broadcasting the same program. FIG. 2 shows a system block diagram of a conventional radio receiver. In FIG. 2, 1 is an antenna, 2 is a distributor, 4a and 4b are first and second front ends, 5a and 5b are first and second intermediate frequency amplifiers (IF) / detectors, and 6 is a reception level detector. , 7 is a tuning system for searching for a desired frequency, and 9 is a switcher for switching audio signals.

In the receiver as described above, for example, when the reception level of the broadcast being received becomes equal to or lower than the set level, it is possible to automatically switch to the broadcast station broadcasting the same program as the broadcast station being received. .

[0004]

However, the conventional channel selection system operates so as to switch to another broadcasting station when the reception level becomes lower than the set level, but when switching to another broadcasting station, multipath is switched. There was a problem that the noise level increased and good radio waves could not be received.

The present invention solves the above-mentioned problems of the prior art, and provides a radio receiver for selecting a broadcasting station having a high reception level and a low multipath noise level to receive a good broadcast. With the goal.

[0006]

A plurality of antennas, a first switcher for switching the antennas when a reception level is below a set level or a multipath noise level is above a set level in a broadcast being received, 1st, 2nd front end connected to 1 switching device, 1st, 2nd
A tuning system that sequentially tunes a broadcast program being received on one side of the second front end to another broadcasting station that is broadcasting the broadcast program on the other side, and a tuning system for receiving each of the received broadcast programs via the first and second front ends. A means for detecting a reception level and a multipath noise level of the broadcast, and a broadcast in which the reception level is equal to or higher than a set level and the multipath noise level is equal to or lower than the set level in the broadcast being received via the first and second front ends. It is composed of a comparator for selecting a station and a second switcher for outputting the audio signal of the broadcasting station selected by the comparator.

[0007]

According to the above configuration, in the case of going out of the service area of the receiving broadcast station, the broadcasting station broadcasting the same program as the receiving program is searched, and the reception level is equal to or higher than the set level. Also, if you select a broadcasting station with a low multipath noise level, and if the reception level is below the set level or the multipath noise level is above the set level, switch the antenna to receive the broadcast with a low multipath noise level. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. Further, the same effects as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 shows a system block diagram of a radio receiver according to an embodiment of the present invention. In FIG. 1, 1a and 1b are antennas,
3 is an antenna switch for switching between the antennas 1a and 1b, 6a and 6b are first and second reception level / multipath noise detectors for detecting a reception level and a multipath noise level, and 8 is a reception level and a multipath noise level. This is a comparator for comparison.

The operation of the radio receiver configured as described above will be described. First, it is assumed that the antenna switching device 3 is selected as the antenna 1a and the first front end 4a is receiving a certain program currently being broadcast.

Therefore, the tuning system 7 for storing the broadcasting stations broadcasting the same program as the broadcasting being received by the first front end 4a in advance in the memory and tuning them in sequence is used to adjust the tuning frequency to the second front every predetermined time. Output to end 4b. At this time, the tuning frequency is set to be a frequency that is not being received by the first front end 4a.
This consists of two oscillators, the first front end 4a, the second
This is to prevent the tuning frequencies output to the front end 4b from being almost the same and preventing the difference from forming a beat and affecting the audio output.

Next, the first and second reception level / multipath noise detectors 6a and 6b detect the reception level and the multipath noise level of the reception signal in the two reception systems, and the comparator 8 compares them at any time. Here, the operation of the comparator 8 will be described below. When the reception level of the signal received by the first front end 4a is higher than that of the signal received by the second front end 4b and the multipath noise level is lower, the switching unit 9 causes the first front end 4a to operate.
Output the audio signal of the signal received in a. afterwards,
The tuning system 7 is controlled to search the tuning frequency of the next broadcasting station that is broadcasting the same program, and the second front end 4b is tuned.

If the signal received by the first front end 4a has a smaller reception level and a higher multipath noise level than the signal received by the second front end 4b, the switching unit 9 causes the second front end to move. End 4
Outputs the audio signal of the signal received at b. afterwards,
The tuning system 7 is controlled so that the first front end 4a sequentially tunes the broadcasting stations that are broadcasting the same program as the broadcast being received by the second front end 4b. Further, when the reception level of the signal selected by the comparator 8 is below the set level or the multipath noise level is above the set level, the antenna switch 3 is controlled to switch the antenna 1a to the antenna 1b. Then, the above operation is repeated thereafter.

According to the present embodiment configured as described above, when the program goes out of the service area of the receiving broadcast station, the same program as the receiving program stored in advance in the memory or the like is broadcast. Search for the current broadcasting station, select a broadcasting station whose reception level is above the set level and whose multipath noise level is below the set level, and whose receive level is below the set level or multipath noise level is above the set level. In this case, by switching the antennas 1a and 1b, a good audio signal with a low multipath noise level can be output.

Although the radio receiver has been described in the present embodiment, the same configuration can be applied to a television receiver.

[0015]

As described above, according to the present invention, in the case of going out of the service area of the receiving broadcasting station, the broadcasting station broadcasting the same program as the receiving program is searched, and the reception level is equal to or higher than the set level. , And the multipath noise level is below the set level, and the reception level is below the set level or the multipath noise level is above the set level, switch the antenna and switch the multipath noise level It is possible to output a small and good audio signal.

[Brief description of drawings]

FIG. 1 is a system block diagram showing a configuration of a radio receiver according to an embodiment of the present invention.

FIG. 2 is a system block diagram showing a configuration of a conventional radio receiver.

[Explanation of symbols]

1, 1a, 1b ... Antenna, 2 ... Distributor, 3 ... Antenna switcher, 4a, 4b ... First and second front end, 5a, 5b ... First and second intermediate frequency amplifier (IF) / detector, 6 ... Reception level detector, 6a, 6b ... First and second reception level / multipath noise detector, 7 ... Tuning system, 8 ... Comparator, 9 ... Switching device.

Claims (1)

[Claims] 1. A plurality of antennas, a first switcher for switching the antennas when a reception level is below a set level or a multipath noise level is above a set level in a broadcast being received, and the first switch. A first and a second front end connected to the receiver, and a tuning for sequentially tuning a broadcast program being received on one of the first and second front ends to another broadcasting station broadcasting the broadcast program on the other side. A system, means for detecting a reception level and a multipath noise level of a broadcast currently being received via the first and second front ends, and receiving in a broadcast being received via the first and second front ends A comparator that selects a broadcasting station whose level is equal to or higher than a setting level and whose multipath noise level is equal to or lower than the setting level, and a broadcasting station selected by the comparator. And a second switcher for outputting the audio signal of the radio receiver.