JPH1013277A - Receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously receive two programs and also to secure the operation as a selection diversity receiving device by preparing two receiving devices and operating them effectively, when two broadcasts at different frequencies are received at the same time. SOLUTION: A switch 110 switches the input of a base band signal of a receiving circuit 105 between a base band processing part 112 and a switch 109. The switch 109 decides whether the input to be applied to a base band processing part 111 is defined as the base band signal, sent from a receiving circuit 102 or the output, given from the switch 110. The switch 109 is controlled by the output signal of a comparator 107 and the switch signal sent from a switch control part 100. Then the tuning frequency of both circuits 102 and 105 and the switch 110 are controlled by the switch signals of the part 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving apparatus for FM multiplex broadcasting, and more particularly to an effective use when a plurality of receiving apparatuses are provided.

[0002]

2. Description of the Related Art In FM broadcasting, in addition to conventional broadcasting, FM multiplex broadcasting in which digital data is superimposed and broadcast on the high frequency side of an audio broadcasting band is performed. The information content of the digital data here includes traffic information, weather information, entertainment information, and the like in addition to audio broadcast program information broadcast on the same frequency. for that reason,
It can easily be imagined that the FM multiplex digital information program desired to be received at the same time as the desired audio broadcast program is not the same frequency but another broadcasting station having a different frequency. In order to cope with such a situation, it is necessary to add a new receiving device for simultaneously receiving the FM multiplex broadcast in addition to the conventional receiving device for audio broadcasting.

For example, in the FM multiplex receiver disclosed in Japanese Patent Application Laid-Open No. 6-141007, even if a desired stereo program and a desired multiplex program have different frequencies, they are simultaneously tuned to obtain a sound output. A technique for displaying a multiplex program on a display circuit has been disclosed. That is, by providing two tuner circuits, that is, a tuner circuit on the stereo program side and a tuner circuit on the multiplex program side, and providing a signal demodulation circuit for each, a program of FM multiplex digital information desired to be received at the same time as an audio broadcast program can be obtained. , It is possible to receive even a different broadcasting station having a different frequency.

[0004]

However, simply increasing the number of receivers not only leads to an increase in the scale or density of the circuit and an increase in cost, but also results in a case where only one broadcast is to be received. In this case, the newly installed receiving device is not effectively used. Also, in a receiving apparatus that performs selective diversity for receiving a single broadcast, two or more programs having different frequencies cannot be simultaneously received, of course, even if a plurality of receiving apparatuses are included.

Accordingly, the present invention includes two receiving devices (receiving units), so that when two broadcasts having different frequencies are simultaneously received, the two receiving devices operate effectively and the two receiving devices have different frequencies. It is possible to receive two programs at the same time, and even when receiving a broadcast of only one frequency, two receiving devices are effectively utilized to improve the reception quality when receiving only one frequency broadcast To provide a receiving device.

[0006]

In order to solve the above-mentioned problems, the first invention of the present application is directed to a first and a second antenna units, and a first antenna for outputting a signal proportional to a received electric field and a baseband signal. And a second receiving unit (comprising a receiving circuit and a detector), and a first determining unit (comprising a comparator and an OR circuit) for comparing the magnitude of a signal proportional to the received electric field, A receiving device comprising: a first and a second switching unit; a first and a second baseband processing unit for processing the baseband signal; and a switching control unit,
And the second antenna unit are respectively connected to the first and second antennas.
And the second switching unit switches between introducing the baseband signal of the second receiving unit to the second baseband processing unit and introducing the baseband signal to the first switching unit. The first switching unit switches between an input to the first baseband processing unit and a baseband signal from the first receiving unit or an output from the second switching unit. The first switching unit is controlled by an output signal of the first determining unit and a switching signal from the switching control unit, and controls a tuning frequency of the first and second receiving units and the second switching unit. Is controlled by a switching signal from the switching control unit. Note that, instead of the signal proportional to the reception electric field from the first and second reception units, a reception unit that outputs a signal corresponding to reception quality, for example, a signal proportional to a signal-to-noise ratio of a reception wave is used. Can also.

That is, in the receiving apparatus according to the first aspect of the present invention, when only one broadcast is received, the tuning frequencies of the first and second receiving sections are respectively changed by the switching signal from the switching control section. Are set to the one broadcast frequency, the first switching unit is controlled only by the output signal of the first determination unit, and the second switching unit is configured to output the baseband signal of the second reception unit to the first reception unit. Switching is performed so as to be introduced into the switching unit. Thus, of the baseband signals of the first and second receiving units, the one having the larger received electric field is the first band.
And is introduced into the first baseband processing unit by controlling the first switching unit. That is, in this case, it operates as a selective diversity receiver.

Next, when two broadcasts having different frequencies are simultaneously received, a switching signal from the switching control unit is used to
The tuning frequencies of the first and second receiving units are set to the broadcast frequencies of the first and second broadcasts, respectively, and the first switching unit performs the first receiving regardless of the output of the first determining unit. The baseband signal from the unit is switched so as to be introduced into the first baseband processing unit, and the second switching unit is configured so that the baseband signal from the second receiving unit is introduced into the second baseband processing unit. Is switched to Thus, the first broadcast is received and processed by the first receiving unit and the first baseband processing unit, and the second broadcast is received and processed by the second receiving unit and the second baseband processing unit. Thus, simultaneous reception of two broadcasts having different frequencies is realized.

Further, the second invention of the present application is directed to a first and a second antenna unit, a first and a second receiving unit for outputting a signal proportional to the receiving electric field and a baseband signal, and the receiving electric field. A first determination unit that compares the magnitude of a signal proportional to the first and second switching units; a first and a second baseband processing unit that processes the baseband signal;
A receiving device comprising: a switching control unit; and a third and fourth switching unit that switches between connecting the output of the first and second antenna units to one of the first and second receiving units. An output signal proportional to a received electric field from the first and second receiving units is introduced into the first determining unit, or a second and third determining unit for comparing the signal level with a predetermined signal level, respectively. 5th and 6th switching sections for switching whether or not to introduce into the second, the third and 4th switching sections
And a signal from the switching control unit and a signal from the switching control unit, and the fifth and sixth switching units are controlled by a signal from the switching control unit.

That is, in the receiving apparatus according to the second aspect of the present invention, when only one broadcast is received, the third and fourth switching units are controlled by the switching signal from the switching control unit, and the second and fourth switching units are controlled. And the first antenna unit is fixedly connected to the first receiving unit, and the second antenna unit is fixedly connected to the second receiving unit, regardless of the output signal from the third determination unit. . The fifth and sixth switching units are switched so that the signal outputs proportional to the received electric fields from the first and second receiving units are both introduced into the first determining unit. The tuning frequencies of the first and second receiving units and the first and second switching units are controlled in the same manner as when the receiving device of the first invention receives only one broadcasting station. As a result, when only one broadcast is received, it operates as a selective diversity receiver.

When two broadcasts having different frequencies are received at the same time, the third and fourth switching units are operated by the switching signals from the switching control unit and the output signals from the second and third determining units. The fifth and sixth switching units are switched such that signal outputs from the first and second receiving units, which are proportional to the received electric field, are introduced into the second and third determining units, respectively. The tuning frequencies of the first and second receiving units and the first and second switching units are switched in the same manner as when the receiving device of the first invention simultaneously receives two broadcasts having different frequencies. This allows the first
The receiving unit and the first baseband processing unit compare the reception electric field with the set level by the second determination unit, switch the first and second antenna units according to the result, and perform the first broadcast. Receive and process. Similarly, the second receiving unit and the second baseband processing unit determine by the third determining unit
The received electric field is compared with the set level, and the first and second antenna units are switched according to the result to receive and process the second broadcast. Therefore, simultaneous reception of two broadcasts having different frequencies is realized.

Further, the above-mentioned receiving apparatus further comprises a time obtaining means, wherein a predetermined time interval is obtained from the time obtaining means, and a switching signal is outputted from the switching control section. With this configuration, by applying the switching method in which the switching signal is output from the switching control unit at a preset time interval to the receiving device according to the first or second aspect of the present invention, the above-described receiving operation of only one broadcast is performed. It can also be set so that the two broadcast reception operations having different frequencies are switched at a preset time interval.

[0013] Further, in the above-mentioned receiving apparatus, the switching control unit is characterized in that position information of the receiving apparatus is introduced from position acquiring means, and a switching signal is output based on the information. Then, by applying the switching method in which a switching signal is output from the switching control unit according to the position of the receiving device to the receiving device according to the first or second invention of the present application, the reception operation of only one broadcast and the frequency It is also possible to set so that the two different broadcast receiving operations are switched according to the position of the receiving device.

Further, in the receiving apparatus according to the third aspect of the present invention, except for the service area end of one broadcasting station, the two receiving units receive the same broadcasting station and perform diversity reception. If it is no longer possible to obtain a received electric field exceeding a certain set electric field strength even when performing diversity reception, the tuning frequency of one receiving unit is changed to the frequency (different frequency) of a neighboring broadcasting station broadcasting the same content. After changing the reception state, if the reception state of the neighboring broadcast station is better, the tuning frequency of the remaining receiver is also set to the broadcast frequency of the neighboring broadcast station, and diversity reception can be started.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. The antennas 101 and 104 are connected to receiving circuits 102 and 105, respectively, and IF (Intermediate Frequenc
y) The output is connected to the envelope detectors 103 and 106, respectively, and the baseband signal output is connected to the switches 109 and 110, respectively. Here, the baseband signal output of the receiving circuit 102 is connected to one of two switching terminals of the switch 109, and the baseband output of the receiving circuit 105 is connected to a fixed terminal of the switch 110. The remaining switching terminals of switch 109 are
The switch 110 is connected to one of the switching terminals. Switch 1
09 is a baseband processing unit 1 connected to the fixed terminal.
The control signal input to the control terminal switches whether to introduce the baseband signal output of the receiving unit 102 or the output from the switch 110 into 11. The switch 110 switches the baseband output from the receiving unit 105 connected to the fixed terminal to the baseband processing unit 112 or the switch 109 according to a control signal input to the control terminal.

On the other hand, the outputs of the envelope detectors 103 and 106 are connected to a comparator 107, and the output of the comparator 107 is connected to an input of an OR circuit 108. OR circuit 10
The output of 8 is connected to the control signal terminal of the switch 109. From the switching control unit 100, the receiving units 102 and 105
And the remaining input terminals of the OR circuit 108 and the switch 110
Are input to the control signal terminals described below.

When receiving only one broadcast, it operates as a conventional selective diversity receiver. That is, the switching control unit 100 sends two reception circuits 1
At 02, 105 the same tuning frequency signal is introduced, which tunes to the same frequency. OR from switching control unit 100
The signal introduced into one of the inputs of the circuit 108 is a LOW signal, so that the output signal of the comparator 107 becomes the switching control signal of the switch 109 as it is, and the switching control unit 100
, The fixed terminal of the switch 110 and the switch terminal connected to the switch 109 are switched to be conductive, so that the larger one of the envelope detection outputs of the receiving circuits 102 and 105 is subjected to baseband processing. Part 111
Will be introduced to

When it is necessary to receive the second broadcast station, a tuning signal corresponding to the reception frequency of the second broadcast station is introduced from the switching control unit 100 to the receiving circuit 105, and the second broadcast station is received.
Tuner tunes to the second broadcast station. At the same time, the switching control unit 100 introduces a HIGH signal to the input of the OR circuit 108 and changes the control signal introduced to the control terminal of the switch 109 to H
Fix to IGH. As a result, the fixed terminal of the switch 109 and the switching terminal connected to the baseband output of the receiving circuit 102 are made conductive. Further, the switch 110 is controlled to make the fixed terminal thereof and the switching terminal connected to the baseband processing unit 112 conductive. Thus, the reception signal of the first broadcast station is transmitted to the antenna unit 101, the reception circuit 102,
The signal is introduced into the baseband processing unit 111 via the switch 109. The received signal of the second broadcasting station is transmitted to the antenna unit 1
The signal is introduced into the baseband processing unit 112 via the receiving circuit 105 and the switching circuit 110.

At this time, when the control signal is a LOW signal in the switching device 110, a switching terminal that conducts with the fixed terminal,
If a switching terminal that conducts with a fixed terminal is connected to the switch 109 when the control signal is a LOW signal, when only the first broadcast station is received, the OR circuit 108 and the switch 110 are connected to the LOW signal. When two broadcasting stations are received in addition to the second broadcasting station, a HIGH signal may be introduced into the OR circuit 108 and the switch 110, and there is an advantage that switching control is simplified.

In this embodiment, the switch 109 is HIGH.
When the signal is introduced as a control signal to the control terminal, the baseband output of the receiving circuit 102 and the baseband processing unit 111 are connected.
This A when receiving one broadcasting station
When the input to the ND circuit is a HIGH signal and the input for receiving two broadcasting stations is a LOW signal, when the LOW signal is introduced as a control signal, the receiving circuit 102
It is also possible to use a switch that connects the baseband output of the above to the baseband processing unit 111.

Here, the baseband processing units 111 and 112 will be described in detail. The baseband processing means a processing unit including a demodulation circuit for an audio signal or a multiplexed signal, and for the present invention, a device of the following embodiment may be appropriately selected and used. First, in the first embodiment, the baseband processing unit 111 has an audio broadcasting process and a multiplex broadcast processing function, and the baseband processing unit 112 has a multiplex broadcast processing function. At this time, if only an audio broadcast is desired, the above-described operation of receiving only one broadcast is performed. If a multiplex broadcast is received, the multiplex broadcast is multiplexed with the currently received broadcast. If the desired multiplex broadcast is being broadcasted by another broadcasting station having a different frequency, the operation can be switched to the operation for receiving the second broadcast. Then, the reception may be performed using the baseband processing unit 112.

The second is that the baseband processing units 111 and 1
Each of the embodiments 12 has a multiplex broadcast processing function. At this time, the receiver will be a multiplex broadcast-only receiver,
By switching between the above two operations, for example, two multiplex broadcast programs of a text broadcast and a weather information broadcast can be received.

Third, the baseband processing units 111 and 1
Each of the embodiments 12 has an audio broadcast processing and a multiplex broadcast processing function. At this time, in addition to the operations of the first and second baseband processing receivers, two audio broadcasts can be simultaneously received if necessary.

The fourth baseband processing section 111 has an audio signal processing function, and the baseband processing section 112
Is an embodiment having a multiplex signal processing function. In the present embodiment, it is possible to simultaneously receive audio broadcast and multiplex broadcast both when they are broadcast on different frequencies and when they are broadcast on the same frequency. For example, an apparatus as shown in FIG. What is necessary is just to change into a structure.

In FIG. 2, the baseband signal output of the receiving circuit 105 is connected to one of the switching terminals of the switching device 109 and one of the switching terminals of the switching device 110.
Is a fixed terminal of the multiplex signal processing unit 112 for baseband processing.
1 in that the remaining switching terminals are connected to the fixed terminals of the switching device 109. When only one broadcast station is received, switch 110 is switched to switch 109.
Are switched so that the fixed terminal of the multiplexed signal processing unit 112 is electrically connected to the fixed terminal. Other switching is the same as in the embodiment according to the first invention. As a result, the receiving circuit 105 and the multiplexed signal processing unit 112 are separated from each other, and for example, audio broadcasting and multiplexed broadcasting that are broadcast by the same broadcasting station and received by the antenna 101 can be simultaneously received. next,
When simultaneously receiving a multiplex broadcast from a broadcast station having a different frequency from the audio broadcast, the switch 111 is switched so that the receiving circuit 105 and the multiplex signal processing unit 112 are conducted. Other switching is the same as in the embodiment according to the first invention. As a result, the audio broadcast is transmitted through the antenna 10
1. The audio signal processing unit 111 processes the signal on the path of the receiving circuit 102 and the switch 109, and the multiplexed broadcast is processed on the path of the antenna 104, the receiving circuit 105, and the switch 110 in the multiplex signal processing unit 1.
12 will be processed.

An embodiment of the second invention will be described with reference to FIG. Note that the same parts as those in the first embodiment are denoted by the same reference numerals. In the present embodiment, unlike the above embodiment, the output of the antenna unit 101 is the switch 1
It is connected to one of 13 switching terminals. The output of the antenna unit 101 is divided into two and connected to one of the switching terminals of the switch 117. The output of the antenna unit 104 is also divided into two, and the remaining switching terminals of the switch 113 and the switch 117
Are connected to the remaining switching terminals. Switch 113, 117
Are connected to the receiving circuits 102 and 105, respectively, and the switch 113 determines which output of the antenna units 101 and 104 is to be introduced to the receiving circuit 102 by a control signal introduced to the switching control terminal. To switch.
Similarly, the switch 117 switches which output of the antenna units 101 and 104 is to be introduced to the receiving circuit 105 by a control signal introduced to its switching control terminal. The output of the envelope detector 103 is connected to the fixed terminal of the switch 115.

One of the switching terminals of the switch 115 is the comparator 1
07, and the remaining switching terminals are connected to the comparator 116.
Connected to. The switching control terminal of the switch 115 is connected to a switching control signal line from the switching control unit 100. The output of the envelope detector 106 is connected to the fixed terminal of the switch 119. One of the switching terminals of the switch 119 is connected to the input of the comparator 107, and the other switching terminal is connected to the comparator 120. The switching control terminal of the switching device 119 includes a switching control unit 10.
The switching control signal line is connected from 0. Comparators 116, 1
The other 20 input terminals (omitted in the figure) are each maintained at a fixed potential serving as a switching reference. And comparator 1
The outputs of 16 and 120 are divided by two frequency dividers 123 and 124, respectively.
Is connected to one of the input terminals of the OR circuits 121 and 122. The switching signal lines from the switching control unit 100 are connected to the remaining input terminals of the two OR circuits 121 and 122, respectively. The outputs of the OR circuits 121 and 122 are connected to switching signal terminals of the switches 113 and 117. Other connections are the same as in the above embodiment.

When receiving only the first broadcast station, the receiving device operates as a selective diversity receiving device. That is, the same tuning control signal is introduced from the switching control unit 100 to the two receiving units 102 and 105, and the first
Is tuned to the broadcast frequency of the broadcaster. At the same time, a HIGH signal is introduced from the switching control unit 100 to the OR circuits 121 and 122, and the switching control signals introduced to the switches 113 and 117 are fixed to HIGH signals. Switch 113, 1
Reference numeral 17 designates a fixed terminal and a corresponding antenna unit 10 when a HIGH signal is introduced to each switching control terminal.
The switching terminals 1 and 104 are connected so as to conduct. Further, a switching control signal is introduced from the switching control unit 100 to the switching device 110 so that the fixed terminal thereof and the switching terminal connected to the switching device 109 are conducted. Switch 1
The switching control signal is introduced from the switching control unit 100 to the switching control terminals 15 and 119, and the fixed terminal and the switching terminal connected to the comparator 107 are connected so as to conduct. Then, by introducing a LOW signal into the OR circuit 108, the output signal of the comparator 107 is directly used as a switching control signal of the switching unit 109.

In this manner, the output of the antenna unit 101 is introduced to the receiving circuit 102 through the switch 113, the IF output is detected by the envelope detector 103, and the output of the IF is sent to the comparator 107 through the switch 115. be introduced.

On the other hand, the output of the antenna unit 104 is
The IF output is introduced into the receiving unit 105 via the IF 17, the IF output is detected by the envelope detector 106, and introduced into the comparator 107 via the switch 119. Then, the comparator 107 compares the IF outputs of the two receiving units, and the result of the comparison is introduced as a switching signal into the switching unit 109, whereby the larger baseband of the envelope detection result in the receiving unit is obtained. The output will be introduced to the baseband processing unit 111.

Next, when it is necessary to further receive the second broadcasting station, first, a tuning signal is introduced from the switching control unit 100 to the receiving unit 105, and tuned to the broadcasting frequency of the second broadcasting station. At the same time, a HIGH signal is introduced from the switching control unit 100 to the OR circuit 108, and the switching control signal of the switch 109 is fixed to the HIGH signal. The switch 109 is connected so that, when a HIGH signal is introduced as the switch control signal, the fixed terminal and the switch terminal connected to the receiving unit 102 conduct. And an OR circuit 121,
By introducing a LOW signal from the switching control unit 100 as an input to 122, the comparison result information of the comparators 116 and 120 becomes the switching control signal of the switches 113 and 117 as it is. The switches 115 and 119 are the switching control unit 1
The switching control signal is introduced from 00 so that the switching signal connected to the fixed terminal and the comparators 116 and 120 respectively becomes conductive. Further, the switch 110 introduces a switching control signal from the switching control unit 100 so that the fixed terminal thereof and the switching terminal connected to the baseband processing unit 112 are conducted.

In this manner, the received signal of the first broadcast station is processed by the baseband processing section 111 from the receiving section 102 via the switch 109. Then, the IF output of the receiving unit 102 is detected by the envelope detector 103 and compared with a predetermined switching level by the comparator 116 via the switch 115.
The signal is introduced as a switching control signal of the switching unit 113 through the circuit 121, and selects one of the antenna units 101 and 104. The received signal of the second broadcast station is processed by the baseband processing unit 112 from the receiving unit 105 via the switch 110. The IF output of the receiving unit 105 is detected by an envelope detector 106 and compared with a predetermined switching level by a comparator 120 via a switch 119. The comparison result is passed through a frequency divider 124 and an OR circuit 122. It is introduced as a switching control signal of 117, and selects one of the antenna units 101 and 104.

Next, regarding a further embodiment of the present application,
This will be described with reference to FIG. The user inputs in advance the broadcast frequency of the multiplex broadcast station broadcasting desired information and the time at which the user wants to receive the information. The input data is stored in the storage device 200, and when the set time comes during the single broadcast receiving operation,
The CPU 201 reads the broadcast frequency of the multiplex broadcast station input in advance from the storage device 200 and transmits the read broadcast frequency to the switching control unit 100. The switching control unit 100 executes the switching operation as shown in FIG. 1 or FIG. . This makes it possible to switch between the operation of receiving only one broadcast and the operation of receiving two broadcasts having different frequencies at a preset time interval.

FIG. 5 shows another embodiment of the present invention.
This will be described with reference to FIG. The storage device stores in advance the location information of the service area of the broadcasting station as a table.
Store it at 0. When the information of the current position of the receiving device is obtained by the GPS 202 and the CPU 201 determines that it is within the service area of the desired multiplex broadcasting station, the storage device 200
And transmits the broadcast frequency information of the multiplex broadcasting station to the switching control unit, and performs the switching operation as shown in FIG. 1 or FIG. This makes it possible to switch between the operation of receiving only one broadcast and the operation of receiving two broadcasts having different frequencies depending on the position of the receiving device.

Further, an embodiment of the third invention of the present application will be described with reference to FIG. The present embodiment is for simultaneously receiving broadcasts of the same content that are broadcast at different frequencies from a plurality of broadcast stations.

A receiver for performing this kind of operation is disclosed in, for example, Japanese Patent Laid-Open No. 5-102798, which has a receiving electric field strength measuring means for a plurality of broadcast frequencies, When the reception condition of a station deteriorates, the station is switched to a broadcasting station that broadcasts the same contents in a neighboring service area, and, for example, it is possible to continue receiving one program even while moving by car. However, in the receiving apparatus having the above configuration, only the two receiving electric field strength measuring means are effectively used only at the service area end of a certain broadcasting station, and one receiving electric field measuring means, that is, the receiving means is used at other than the service area end. Not.

Therefore, in the present embodiment, two receiving means receive the same broadcasting station except for the service area end of one broadcasting station, and perform diversity reception. If the reception electric field above a certain set electric field strength cannot be obtained even after performing the diversity reception, the tuning frequency of one of the reception means is changed to the frequency of a neighboring broadcasting station broadcasting the same content, and the reception state is changed. If the receiving condition of the neighboring broadcasting station is better, the tuning frequency of the remaining receiving means is also set to the broadcasting frequency of the neighboring broadcasting station, start diversity reception, and effectively use multiple receiving devices I do.

This will be described in detail with reference to FIG. The output of the antenna unit 101 is introduced to a receiving circuit 102, and the IF output of the receiving circuit 102 is introduced to a detector 103. On the other hand, the output of the antenna unit 104 is introduced to the receiving unit 105, and the IF output of the receiving circuit 105 is introduced to the detector 106. The outputs of the detectors 103 and 106 are output from a comparator 107
And the magnitudes are compared. The output of the comparator 107 becomes one of the inputs of the OR circuit 108 and is also introduced into the switching control unit 100. The other input of the OR circuit 108 is connected to a signal line from the switching control unit 100. The output of the OR circuit 109 is connected to the switching control terminal of the switch 109. The fixed terminal of the switch 109 is connected to the baseband processing unit 111 and the detector 125. Switch 1
The baseband output from the receiving circuit 102 is introduced to a switching terminal that conducts with the fixed terminal when the HIGH signal is input to the switching control terminal 09, and the baseband output of the receiving circuit 105 is provided to the other switching terminal. Is introduced. The output of the detector 125 is introduced to one of the inputs of the comparator 126, and the output of the comparator 126 is introduced to the switching control unit 100. The other input (not shown) of the comparator 126 is applied with a voltage corresponding to a desired switching level.

First, when a user selects a broadcast station at a location other than the service area end of the broadcast station, the receiving circuit 1
02 and 105 both introduce a tuning signal from the switching control unit 100 so as to tune to the broadcast frequency of the broadcasting station.
A LOW signal is introduced from the switching control unit 100 to the OR circuit 108, and the output of the comparator 107 is
9 switching signals. By doing so, the outputs from the antenna units 101 and 104 are compared by the comparator 107 via the receiving circuits 102 and 105 and the detectors 103 and 106, respectively, and the switch 109 is operated based on the comparison result, and The baseband output of the receiving unit having a large electric field is conducted to the fixed terminal of the switch 109. Thereby, the baseband signal is transmitted to the baseband processing unit 1.
11 is introduced. The received wave selected at the same time is
09 is detected by a detector 125 connected to the fixed terminal 09, and the detection result is introduced to a comparator 126 and compared with a set level. The comparison result is introduced to the switching control unit 100.

The receiving apparatus moves to the end of the service area of the current broadcasting station, and the reception output after the selection is switched is compared with the comparator 12.
6 is smaller than the set level.
00, the switching control unit 100
5 introduces a tuning signal corresponding to the broadcast frequency of a neighboring broadcast station broadcasting the same contents as the current broadcast station. The broadcast frequency of a nearby broadcast station broadcasting the same content may be read from a ROM incorporated in the switching control unit 100 in advance. Thus, at the same time that the tuning signal of the neighboring broadcasting station is introduced into the receiving circuit 105, a HIGH signal is introduced as an input to the OR circuit 108, and the switching control signal of the switch 109 is fixed at HIGH. As a result, the current reception signal of the broadcasting station is introduced into the baseband processing unit 111.
On the other hand, the comparator 107 compares the magnitude of the received wave of the current broadcast station with the magnitude of the received wave of the neighboring broadcast station, and when a comparison result indicating that the received wave of the neighboring broadcast station is smaller is introduced into the switching control unit 100, The switching control unit 100 receives the tuning signal corresponding to the broadcast frequency of the second neighboring broadcast station (if any) from the receiving circuit 1.
05. If the comparison result that the received wave of the neighboring broadcast station is larger is introduced into the switching control unit 100, the switching control unit 100 introduces a tuning signal corresponding to the broadcast frequency of the neighboring broadcast station into the receiving circuit 102 and simultaneously performs the OR operation. Circuit 1
A LOW signal is introduced as an input of 08.

If the received wave of the current broadcast station is larger than all the neighboring broadcast stations, a tuning signal corresponding to the current broadcast station is introduced into the receiving circuit 105, and the OR circuit 10
The LOW signal is introduced as an input of the ninth signal.

[0042]

According to the present invention, it is possible to simultaneously receive two broadcasts having different frequencies, and to realize a receiving apparatus in which two receiving sections operate effectively even when only one broadcast is received. . Further, when two broadcasts having different frequencies are simultaneously received, the antenna section switching diversity reception can be realized, so that a decrease in reception quality as compared to the selective diversity reception when only one broadcast is received is reduced. A receiving device that can be suppressed can be realized.

Also, reception of only one broadcast and 2
The simultaneous broadcast reception can be automatically switched in time series. Also, upon moving to the service area of the second broadcast,
It is also possible to automatically switch to receiving two broadcasting stations.

According to a further aspect of the present invention, when good reception cannot be performed while diversity reception is being performed, broadcasts of the same contents broadcast at different frequencies from a plurality of broadcast stations are simultaneously received, and good reception is performed. A good reception state.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment according to the first invention of the present application.

FIG. 2 is a configuration diagram of another embodiment of the baseband processing unit according to the first invention of the present application.

FIG. 3 is a configuration diagram of an embodiment according to the second invention of the present application.

FIG. 4 is a configuration diagram of an embodiment in which a reception state is switched based on time information.

FIG. 5 is a configuration diagram of an embodiment in which a reception state is switched based on position information.

FIG. 6 is a configuration diagram of an embodiment according to the third invention of the present application.

[Explanation of symbols]

100 Switching control unit 101, 104 Antenna unit 102, 105 Receiving unit 103, 106, 125 Envelope detector 107, 116, 120, 126 Comparator 108, 121, 122 OR circuit 109, 110, 113, 115, 117, 119 Switch 111, 112 Baseband processing unit 123, 124 Frequency divider 200 Storage device 201 CPU 202 GPS

Claims (5)

[Claims] 1. A first and second antenna unit, and a first antenna for outputting a signal proportional to a received electric field and a baseband signal.
And a second receiving unit, a first determining unit for comparing the magnitude of a signal proportional to the received electric field, a first and a second switching unit, and a first and a second unit for processing the baseband signal. A baseband processing unit and a switching control unit, wherein the first and second antenna units are connected to the first and second receiving units, respectively,
The switching unit switches between introducing the baseband signal of the second receiving unit to the second baseband processing unit and introducing the baseband signal to the first switching unit. The first switching unit The input to the first baseband processing unit is switched between the baseband signal from the first receiving unit and the output from the second switching unit, and the first switching unit 1 and a switching signal from the switching control unit. The tuning frequencies of the first and second receiving units and the second switching unit are controlled by a switching signal from the switching control unit. A receiving device controlled by: 2. A first and second antenna unit, and a first antenna for outputting a signal proportional to a received electric field and a baseband signal.
And a second receiving unit, a first determining unit for comparing the magnitude of a signal proportional to the received electric field, a first and a second switching unit, and a first and a second unit for processing the baseband signal. A baseband processing unit and a switching control unit, wherein the third and fourth switching units switch the output of the first and second antenna units to one of the first and second receiving units. And a fourth switching unit, and the first and second switching units.
The output signal proportional to the received electric field from the receiving unit of
And a fifth and a sixth switching section for switching between introducing the signal into the second and third determining sections for comparing the signal level with a predetermined signal level.
And a fourth switching unit is controlled by an output signal from the second and third determination units and a signal from the switching control unit, and the fifth and sixth switching units are controlled by a signal from the switching control unit. A receiving device controlled by: 3. The receiving apparatus according to claim 1, further comprising a time obtaining unit, obtaining a preset time interval from the time obtaining unit, and outputting a switching signal from the switching control unit. A receiving device characterized by the above-mentioned. 4. The receiving device according to claim 1, wherein position information of the receiving device is introduced into the switching control unit from position acquiring means, and a switching signal is output based on the information. Receiving device. 5. A first and second antenna unit, a first and second receiving unit that outputs a signal proportional to a receiving electric field and a baseband signal, and a magnitude of a signal proportional to the receiving electric field are compared. A first determination unit, a first switching unit, and a first baseband processing unit that processes the baseband signal;
A switching control unit, wherein the first and second antenna units are connected to the first and second receiving units, respectively, and the first switching unit is connected to the first base unit. A second determining unit configured to switch whether an input to the band processing unit is a baseband signal output of the first or second receiving unit and determine an output level of the switching unit; Controlling the tuning frequencies of the first and second receiving units and the switching unit based on an output of the second determining unit, an output of the first determining unit, and a signal from the switching control unit. A receiving device characterized by the above-mentioned.