JP3336558B2 - Antenna switching method for in-vehicle receiving system, in-vehicle receiving system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna switching method for a vehicle-mounted receiving system and a vehicle-mounted receiving system.
In particular, an in-vehicle receiving system including an in-vehicle TV receiver that performs diversity reception using a plurality of diversity antennas and an in-vehicle FM receiver that performs diversity reception using a plurality of diversity antennas,
An antenna switching method of an in-vehicle receiving system for sharing part or all of a plurality of diversity antennas used in an in-vehicle FM receiver with a part or all of a plurality of diversity antennas used in an in-vehicle TV receiver, Regarding the receiving system.

[0002]

2. Description of the Related Art Conventionally, a vehicle is provided with an on-vehicle FM radio receiver so that the vehicle can travel while listening to FM radio broadcasting. In recent years, in order to enjoy a more comfortable car life, a vehicle-mounted TV receiver has been
In many cases, V broadcasts can be viewed. by the way,
When trying to receive a TV broadcast or an FM radio broadcast while moving like a vehicle, the occurrence of multipath distortion is inevitable. In order to suppress this multipath distortion, usually, a plurality of antennas are installed in the vehicle in different directions and places, and when receiving with one antenna, if the reception level falls below a certain level, switch to another antenna to receive. I try to do diversity like that. Diversity of in-vehicle FM radio receivers is performed by installing two FM antennas. In addition, the diversity of in-vehicle FM radio receivers is the
Four antennas are installed.

[0003]

However, as shown in FIG. 6, in general, a vehicle originally has one AM / FM radio.
Since only one AM / FM antenna 1 is installed, the diversity FM in-vehicle FM radio receiver 1
0 and the on-vehicle TV receiver 20
It is necessary to retrofit five antennas, the antenna 2 and the TV antennas 3 to 6, to install a total of six antennas.
Installation and wiring work of the retrofitted antenna is difficult, and there is a problem that water easily enters from the installation location. Also,
When a large number of antennas are installed, there is a problem that the antenna is easily broken when the vehicle is put into a garage or a multi-story parking lot, and it is necessary to get off the vehicle and fold the antenna short beforehand, which is troublesome. These problems also occur in the same manner when a diversity type vehicle-mounted TV receiver and a vehicle-mounted FM multiplex broadcast receiver are installed. The present invention has been made in view of the above-described problems of the related art, and reduces the number of antennas to be installed on a vehicle, reduces the burden of mounting work and wiring work, and saves time for folding the antenna when putting the vehicle in a garage or a multistory parking lot. It is an object of the present invention to provide an on-vehicle receiving system antenna switching method and an on-vehicle receiving system that can reduce the amount of noise.

[0004]

Means for Solving the Problems] antenna switching method of claim 1, wherein the <br/> wheel mounting reception system of the present invention, according to claim 5
The car mounting reception system according, vehicle TV performing diversity reception using a plurality of diversity antennas
A receiver, a vehicle FM receiver for performing diversity reception using a plurality of diversity antennas, vehicle
TV broadcast alone reception on TV receiver for car, FM receiver for car
FM broadcast alone reception, TV broadcast with in-vehicle TV receiver
And a vehicle-mounted FM receiver capable of simultaneously receiving FM broadcasts. In a vehicle-mounted receiving system, a plurality of diversity antennas used for a vehicle-mounted FM receiver are all replaced with a plurality of diversity antennas used for a vehicle-mounted TV receiver. Antenna switching means for switching a part or all of the plurality of diversity antennas used in the in-vehicle TV receiver to the in-vehicle TV receiver and the in-vehicle FM receiver in order to use the same part or all of the diversity antennas. , TV broadcast with in-vehicle TV receiver
And receiving FM broadcasts with the on-vehicle FM receiver
When the TV broadcast is received by the in-vehicle TV receiver
And you are receiving FM broadcasts with an on-vehicle FM receiver
The antenna switching means on the side of the in-vehicle TV receiver
Switching, FM broadcast is being received by the on-vehicle FM receiver
When the TV broadcast is not received by the in-vehicle TV receiver,
Switch antenna switching means to FM receiver for vehicle
The feature is that it can be obtained. Claim of the invention
Item 2. How to switch the antenna of the in-vehicle receiving system according to item 2.
In the in-vehicle receiving system according to claim 6, a plurality of
Diversity reception using an diversity antenna
In-vehicle TV receiver and multiple diversity antennas
FM receiver for in-vehicle use that performs diversity reception using
Equipped with a TV receiver for in-vehicle TV receiver
FM broadcast alone reception with FM receiver for car, TV receiver for car
Simultaneous reception of TV broadcasting on the TV and FM broadcasting on the in-vehicle FM receiver
In an in-vehicle receiving system that can
Some of the diversity antennas used for transceivers
Multiple diversity antennas for in-vehicle TV receivers
In-vehicle TV receivers that can be used for part or all of the
Some or all of the diversity antennas used for
Antenna for car TV receiver and car FM receiver
Provide antenna switching means for switching, and receive TV for in-vehicle use
TV broadcast is being received by the TV, and FM is broadcast by the in-vehicle FM receiver.
TV is not being received when the
And receiving FM broadcasts with the on-vehicle FM receiver.
If you are communicating, set the antenna switching means to
Switch to the receiver side, and use the on-vehicle FM receiver to broadcast FM
Receiving and receiving TV broadcast with in-vehicle TV receiver
When there is no antenna switching means, use the FM receiver
Is switched to the side of.
One or more antennas can be connected to a TV receiver for vehicle and a F for vehicle
Shared with the M receiver, and the TV broadcast is received independently.
When the TV broadcast and the FM broadcast are performed at the same time,
On the side of in-vehicle TV receivers that are strongly affected by multipath
By switching the shared antenna with priority, diversity
TV images with good image quality
You. Also, when FM broadcasting is received independently , switching the shared antenna to the side of the on-vehicle FM receiver enables good FM reception by diversity.
Since the antennas are shared, the number of antennas to be installed in the vehicle can be reduced, reducing the burden of installation work and wiring work, and reducing the time required to fold the antenna short when putting the vehicle in the garage or multi-story parking lot. .

[0005]

A vehicle receiving system according to claim 3 of the present invention.
8. The in-vehicle reception system according to claim 7 , wherein the in-vehicle TV receiver performs diversity reception using a plurality of diversity antennas, and the in-vehicle FM reception performs diversity reception using a plurality of diversity antennas. And an on- board TV receiver.
TV broadcasting alone reception, FM broadcasting alone with in-vehicle FM receiver
Reception, TV broadcast with on-board TV receiver and on-vehicle FM reception
In the in- vehicle receiving system capable of simultaneously receiving FM broadcasts on a TV, all or a plurality of diversity antennas used for the in-vehicle FM receiver are shared with some or all of the plurality of diversity antennas used for the in-vehicle TV receiver. Therefore, an antenna switching means for switching a part or all of a plurality of diversity antennas used for the in-vehicle TV receiver between the in-vehicle TV receiver and the in-vehicle FM receiver is provided, and the in-vehicle TV receiver broadcasts the TV broadcast. When receiving, the antenna switching means is switched to the in-vehicle TV receiver, and when the TV broadcast is not being received by the in-vehicle TV receiver, the antenna switching means is switched to the in-vehicle FM receiver. That is, it is characterized.
An antenna for a vehicle-mounted receiving system according to claim 4 of the present invention.
Switching method, in the vehicle-mounted receiving system according to claim 8
Uses multiple diversity antennas for diversity.
TV receiver for in-vehicle reception and multiple diversity
For in-vehicle reception using diversity antenna
An FM receiver is provided, and a TV broadcast unit with an in-vehicle TV receiver is provided.
German reception, FM broadcast alone reception by in-vehicle FM receiver, in-vehicle
Broadcasting with TV Receiver for Car and FM with FM Receiver for Car
In an in-vehicle receiving system that can receive broadcasts simultaneously,
Multiple diversity antennas used in FM receivers for vehicles
Multiple divers using part of the antenna for in-vehicle TV receivers
To be used in part or all of the city antenna,
Of multiple diversity antennas used in TV receivers
Some or all of the antennas are mounted on the TV receiver for the vehicle and for the vehicle
An antenna switching means for switching to an FM receiver;
When a TV broadcast is being received by the in-vehicle TV receiver,
Switch the antenna switching means to the TV receiver for vehicle
When the TV broadcast is not being received by the on-board TV receiver
Switches the antenna switching means to the side of the on-vehicle FM receiver.
It is characterized by having been changed. One or more antennas are shared between the on-vehicle TV receiver and the on-vehicle FM receiver, and when the TV broadcast is received alone
TV broadcast when TV broadcast and FM broadcast are simultaneous
When receiving a TV
Switching the shared antenna prior to the receiver
It is possible to perform good TV reception by diversity
When the FM broadcast is received independently , switching the common antenna to the side of the on-vehicle FM receiver enables good FM reception by diversity. Since the antennas are shared, the number of antennas to be installed in the vehicle can be reduced, reducing the burden of installation work and wiring work, and reducing the time required to fold the antenna short when putting the vehicle in the garage or multi-story parking lot. .

[0007]

FIG. 1 is a block diagram showing the configuration of a vehicle-mounted receiving system according to an embodiment of the present invention. The same components as those in FIG. 6 are denoted by the same reference numerals. Numeral 10 denotes a diversity type in-vehicle FM radio receiver, and numeral 20 denotes a diversity type in-vehicle TV receiver. Reference numeral 1 denotes an AM / FM dual-purpose antenna originally installed in the vehicle, which is connected to the on-vehicle FM radio receiver 10. 3-6 is T
V antennas, each of which is retrofitted to a predetermined location of the vehicle in a predetermined direction. The TV antennas 4 to 6 are connected to the in-vehicle TV receiver 20. TV antenna 3
Is connected to the input side of the antenna switching circuit 30, and two output sides of the antenna switching circuit 30 are respectively connected to the in-vehicle FV radio receiver 10 and the in-vehicle TV receiver 2.
Connected to 0. The on-vehicle FM radio receiver 10 has a power supply circuit 11 for supplying power to each part of the set or stopping the supply in accordance with the on / off operation of a power switch (not shown). Similarly, the in-vehicle TV receiver 20 also has a power supply circuit 21 for supplying power to each part of the set or stopping the supply in accordance with the on / off operation of a power switch (not shown). The power supply circuits 11 and 21 use the + ACC input from the ACC switch to create a DC stabilized power supply using a DC-DC converter.

Reference numeral 40 denotes a switching control circuit which controls switching of the antenna switching circuit 30 so that the vehicle-mounted FM radio receiver 10 and the vehicle-mounted TV receiver 20 have:
The connection of the TV antenna 3 is switched to the one where the reception is started later. The switching control circuit 40 includes the power supply circuits 11,
An output power supply voltage of 21 is input, and a rise change is monitored. Then, a switching control signal that changes to L level when the output power supply voltage of the power supply circuit 11 rises and changes to H level when the output power supply voltage of the power supply circuit 21 rises is output to the antenna switching circuit 30. When the switching control signal is at L level, T
Connect the V antenna 3 to the on-vehicle FM radio receiver 10,
At the H level, it is connected to the on-vehicle TV receiver 20.

FIG. 2 is a circuit diagram showing a specific configuration example of the antenna switching circuit 30. The TV antenna 3 is connected to the anodes of the pin diodes D1 and D2 branched into two systems via a coupling capacitor C1, and the cathodes of the pin diodes D1 and D2 are mounted on the vehicle via the coupling capacitors C6 and C6, respectively. TV receiver 2
0, connected to the on-vehicle FM radio receiver 10. The anode sides of the pin diodes D1 and D2 are connected to + V via a resistor R1 and a coil L1. The resistor R1, the coil L1, and the capacitor C2 have a function of preventing a signal received by the TV antenna 3 from flowing to + V or GND. A coil L is connected between the cathode of the pin diode D1 and GND.
2. The capacitor C3 is connected in series, and the coil L2
The collector of the transistor Q1 is connected between the power supply and the capacitor C3. The collector of Q1 is connected via a resistor R2 to +
V, and the emitter is connected to GND. A resistor R3 is connected between the base and the emitter of Q1. A switching control signal is input to the base of Q1 via a resistor R4.

On the other hand, the cathode of the pin diode D2 and G
The coil L3 and the capacitor C4 are connected in series between ND, and the collector of the transistor Q2 is connected between the coil L3 and the capacitor C4. The collector of Q2 is connected to + V via a resistor R5, and the emitter is connected to GND. A resistor R6 is connected between the base and the emitter of Q2. The collector of the transistor Q3 is connected to the base of Q2 via the resistor R7. The emitter of Q3 is connected to + V. A resistor R8 is connected between the base and the emitter of Q3. A switching control signal is input to the base of Q3 via a resistor R9.

In the antenna switching circuit 30 configured as described above, when the switching control signal goes to the L level, Q3 turns on, Q2 turns on, Q1 turns off, and the pin diode D2 is forward-biased and becomes conductive. , D1 are in a non-conductive state with no forward bias applied. Therefore, the signals received by the TV antenna 3 are C1, D
2. It is output to the on-vehicle FM radio receiver 10 via C6. Note that L3 and C4 prevent leakage of the received signal from the cathode side of D2 to GND. Conversely, when the switching control signal goes high, Q3 turns off and Q2
Is turned off, Q1 is turned on, the pin diode D1 is forward-biased and becomes conductive, and D2 is not forward-biased and becomes non-conductive. Therefore, the signal received by the TV antenna 3 is output to the in-vehicle TV receiver 20 via C1, D1, and C5. Note that the leakage of the received signal from the cathode side of D1 to GND is prevented by L2 and C3.

FIG. 3 is a circuit diagram showing a specific configuration example of the switching control circuit 40. 41 and 42 are Schmitt trigger circuits for preventing chattering, 43 is an RS flip-flop, and the outputs of the Schmitt trigger circuits 41 and 42 are input to the R terminal and the S terminal. A switching control signal is output from the Q terminal of the RS flip-flop 43. When the power switch of the on-vehicle FM receiver 10 is turned on and the output power supply voltage of the power supply circuit 11 rises, the output of the Schmitt trigger circuit 41 changes from L to H, and the Q terminal output of the RS flip-flop 43 changes to L. fall into. Conversely, when the power switch of the on-vehicle TV receiver 20 is turned on and the output power voltage of the power circuit 21 rises, the output of the Schmitt trigger circuit 42 changes from L to H, and the Q terminal of the RS flip-flop 43 The output goes high.

Next, the operation of the above embodiment will be described. In order for the user to watch the TV broadcast, the in-vehicle TV receiver 20
When the power switch is turned on, the power supply circuit 21 supplies power to each part of the set, and starts reception of TV broadcast. The switching control circuit 40 monitors the rise of the output power supply voltage of the power supply circuits 11 and 21, and when the output power supply voltage of the power supply circuit 21 rises, changes the switching control signal to the H level. Then, the antenna switching circuit 30 connects the TV antenna 3 to the in-vehicle TV receiver 20. As a result, the in-vehicle TV receiver 20 can perform diversity with the four antennas of the TV antennas 3 to 6,
TV broadcasts can be viewed with good image quality and sound quality with reduced multipath distortion. Thereafter, when the user wants to listen to the FM radio broadcast, the power switch of the in-vehicle TV receiver 20 is turned off, and the power switch of the in-vehicle FM receiver 10 is turned on. Then, the power supply circuit 11 supplies power to each part of the set, and starts receiving the FM radio broadcast. The switching control circuit 40 monitors the rise of the output power supply voltage of the power supply circuits 11 and 21, and when the output power supply voltage of the power supply circuit 11 rises, changes the switching control signal to L level. Then, the antenna switching circuit 30 connects the TV antenna 3 to the on-vehicle FM receiver 10. As a result, the on-vehicle FM radio receiver 10 is connected to the TV antenna 3 and the AM / F
Diversity can be achieved with the two antennas of the M-shared antenna 1, and a TV broadcast can be viewed with good sound quality with reduced multipath distortion.

According to this embodiment, the TV antenna 3 can be switched to one of the on-vehicle FM radio receiver 10 and the on-vehicle TV receiver 20 which starts receiving later.
It is rare that a TV broadcast and an FM radio broadcast are received at the same time in a vehicle interior, and usually only one of them is received. Therefore, the TV antenna 3 is shared by the in-vehicle TV receiver 20 and the in-vehicle FM radio receiver 10 and
By switching the shared TV antenna 3 to the in-vehicle TV receiver 20 at the time of receiving a broadcast, good TV reception by diversity can be performed. At the time of receiving FM radio broadcast, the TV antenna 3 is connected to the in-vehicle FM radio. By switching to the receiver 10, good FM reception by diversity can be performed. By sharing the TV antenna 3, the number of antennas to be installed on the vehicle can be reduced by one, and the burden of installation work and wiring work can be reduced, and the antenna can be shortened when the vehicle is put into a garage or a multi-story parking lot. The labor of folding is also reduced.

There is a case where the in-vehicle FM radio receiver 10 and the in-vehicle TV receiver 20 are simultaneously received, and the user enjoys the sound of the FM radio broadcast while watching TV images. At this time, it is desirable to switch the TV antenna 3 to the in-vehicle TV receiver 20 at the time of simultaneous reception, since the TV image is more affected by the multipath distortion than the sound by the FM radio broadcast. Therefore, for example, the switching control circuit 40 shown in FIG. 3 is modified as shown by reference numeral 40A in FIG. 4 so that one is a negative logic input and the other is a positive logic between the Schmitt trigger circuit 41 and the R terminal of the RS flip-flop 43. An input AND circuit 44 is provided, and the output of the Schmitt trigger circuit 41 is ANDed.
A positive logic input of a circuit 44 and a Schmitt trigger circuit 42
Is the negative logic input of the AND circuit 44. When the output power supply voltage of the power supply circuit 11 rises, the switching control circuit 40A configured as described above does not unconditionally change the switching control signal to the L level, but the power supply circuit 21A.
The switching control signal is changed to the L level only when the output power supply voltage falls. If the output power supply voltage of the power supply circuit 11 has not fallen when the output power supply voltage of the power supply circuit 11 has risen, then the output power supply voltage of the power supply circuit 11 The switching control signal is changed to L level on condition that the output power supply voltage is still rising. By doing so, the on-vehicle FM radio receiver 10 and the on-vehicle T
When simultaneously receiving the V receiver 20, the TV antenna 3 is preferentially switched to the in-vehicle TV receiver 20, so that the TV image can be viewed with good image quality.

FIG. 5 is a block diagram showing a configuration of a vehicle-mounted receiving system according to a second embodiment of the present invention. FIG.
The same components as those described above are denoted by the same reference numerals. First
In the embodiment, the switching control circuit switches the TV antenna 3 to the receiving side of the in-vehicle FM radio receiver 10 and the in-vehicle TV receiver 20. When the TV receiver 20 is receiving the TV broadcast, the TV antenna 3 is switched to the TV receiver 20 for the vehicle, and when the TV receiver 20 is not receiving the TV broadcast, the FM for the vehicle is switched.
It is designed to switch to the radio receiver.
The switching control circuit 40B monitors the output power supply voltage of the power supply circuit 21 and outputs a switching control signal that goes high when the voltage is rising and goes low when the voltage is falling. The other components are configured exactly the same as in FIG.

The operation of the second embodiment will be briefly described. When a user turns on a power switch of a vehicle-mounted TV receiver 20 to watch TV broadcasting, an output power supply voltage of a power supply circuit 21 rises, and TV broadcasting is started. Reception starts. The switching control circuit 40B outputs an H level switching control signal in response to the rise of the output power supply voltage of the power supply circuit 21, so that the antenna switching circuit 30 is switched to the vehicle-mounted TV receiver 20 side. Therefore, four antennas 3 ~
6 with excellent image and sound quality
You can watch V broadcast. When the user turns on the on-vehicle FM radio receiver 10 while turning on the on-vehicle TV receiver 20 in order to enjoy FM radio broadcasting while watching only the video of the TV broadcast, the switching control circuit 40B Does not perform antenna switching control. For this reason, the in-vehicle TV receiver 20 can continue the diversity using the four antennas and enjoy a video of good image quality. Of course, the on-vehicle FM radio receiver 10 can receive the FM radio broadcast based on the received signal caught by the AM / FM antenna 1. Thereafter, when the user turns off the power of the in-vehicle TV receiver 20, the switching control circuit 40B outputs an L-level switching control signal, and the antenna switching circuit 30 switches to the in-vehicle FM radio receiver 10. . Therefore, two antennas 1,
With the diversity according to No. 3, FM radio broadcasts can be heard with good sound quality.

According to the second embodiment, the TV antenna 3
TV receiver 20 for car and FM radio receiver 10 for car
The antenna can be reduced by one for the vehicle. When the TV broadcast is received, the shared TV antenna 3 is always switched to the TV side, so that it is possible to perform good TV broadcast reception, and when the TV broadcast is not received and the FM broadcast is received. Is a good FM
Can receive broadcasts. Note that the switching control circuit 40B or the switching control circuit 40B and the antenna switching circuit 30 in FIG. 5 may be incorporated in the in-vehicle TV receiver 20.

In each of the above-described embodiments, a diversity type vehicle-mounted FM which shares an antenna with a vehicle-mounted TV receiver is described.
Although the in-vehicle FM radio receiver has been described as an example of the in-vehicle FM radio receiver, the in-vehicle FM / FM radio receiver can be used, and the in-vehicle FM receiver capable of receiving character information, VICS information, and the like together with or independently of the FM radio broadcast. The same can be applied to the case of combining with a multiplex broadcast receiver or the like. Further, the in-vehicle TV receiver may perform diversity using three or more antennas, and the in-vehicle FM receiver may perform diversity using three or more antennas. . In addition, the in-vehicle TV receiver and the in-vehicle F
The number of antennas shared with the M receiver may be two or more. For example, all the antennas used by the in-vehicle FM receiver for diversity may be shared.

[0020]

According to the antenna switching method and the in-vehicle receiving system of the present invention, one or a plurality of antennas are shared by the in-vehicle TV receiver and the in-vehicle FM receiver.
Switching the shared antenna to the in-vehicle TV receiver at the time of receiving V broadcast enables good TV reception by diversity, and switching to the in-vehicle FM receiver when receiving FM broadcast. Thus, good FM reception by diversity can be performed. Since the antennas are shared, the number of antennas to be installed on the vehicle can be reduced, reducing the burden of installation work and wiring work, and reducing the time required to fold the antenna short when putting the vehicle in the garage or multi-story parking lot. .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a vehicle-mounted receiving system according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a specific configuration example of an antenna switching circuit.

FIG. 3 is a circuit diagram illustrating a specific configuration example of a switching control circuit.

FIG. 4 is a circuit diagram showing a specific configuration of a switching control circuit according to a modification of the first embodiment.

FIG. 5 is a block diagram illustrating a configuration of a vehicle-mounted receiving system according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a conventional in-vehicle receiving system.

[Explanation of symbols]

1 AM / FM antenna 3, 4, 5, 6
TV antenna 10 FM radio receiver for vehicle 20 TV for vehicle
Receiver 30 Antenna switching circuit 40, 40A, 40B Switching control circuit

Claims (8)

(57) [Claims] 1. An in-vehicle TV receiver comprising: a vehicle-mounted TV receiver for performing diversity reception using a plurality of diversity antennas; and a vehicle-mounted FM receiver for performing diversity reception using a plurality of diversity antennas .
TV broadcasting alone reception, FM broadcasting alone with in-vehicle FM receiver
Reception, TV broadcast with on-board TV receiver and on-vehicle FM reception
In the in- vehicle receiving system capable of simultaneously receiving FM broadcasts on a TV, all of the plurality of diversity antennas used for the in-vehicle FM receiver are shared with some or all of the plurality of diversity antennas used for the in-vehicle TV receiver Therefore, a part or all of the plurality of diversity antennas used in the in-vehicle TV receiver are connected to the in-vehicle TV receiver and the in-vehicle F receiver.
An antenna switching means for switching to an M receiver is provided, and an on- vehicle TV receiver receives a TV broadcast.
When the receiver does not receive FM broadcasts,
FM receiver for in-vehicle receiving TV broadcasting with receiver
If you are receiving FM broadcasts at
Switch the stage to the in-vehicle TV receiver and receive in-vehicle FM
FM broadcast is received by the TV and the TV is released by the on-board TV receiver.
When no transmission is received, switch the antenna switching means
An antenna switching method for an in-vehicle receiving system, wherein the antenna is switched to an on-board FM receiver . 2. An in-vehicle TV receiver for performing diversity reception using a plurality of diversity antennas and an in-vehicle FM receiver for performing diversity reception using a plurality of diversity antennas .
TV broadcasting alone reception, FM broadcasting alone with in-vehicle FM receiver
Reception, TV broadcast with on-board TV receiver and on-vehicle FM reception
A part of a plurality of diversity antennas used for an in-vehicle FM receiver is partially or entirely replaced with a part or all of a plurality of diversity antennas used for an in-vehicle TV receiver in an in-vehicle receiving system capable of simultaneously receiving FM broadcasts. In order to use both, a part or all of the plurality of diversity antennas used in the in-vehicle TV receiver are connected to the in-vehicle TV receiver and the in-vehicle F
An antenna switching means for switching to an M receiver is provided, and an on- vehicle TV receiver receives a TV broadcast.
When the receiver does not receive FM broadcasts,
FM receiver for in-vehicle receiving TV broadcasting with receiver
If you are receiving FM broadcasts at
Switch the stage to the in-vehicle TV receiver and receive in-vehicle FM
FM broadcast is received by the TV and the TV is released by the on-board TV receiver.
When no transmission is received, switch the antenna switching means
An antenna switching method for an in-vehicle receiving system, wherein the antenna is switched to an on-board FM receiver . 3. An in-vehicle TV receiver comprising: a vehicle-mounted TV receiver for performing diversity reception using a plurality of diversity antennas; and a vehicle-mounted FM receiver for performing diversity reception using a plurality of diversity antennas .
TV broadcasting alone reception, FM broadcasting alone with in-vehicle FM receiver
Reception, TV broadcast with on-board TV receiver and on-vehicle FM reception
In the in- vehicle receiving system capable of simultaneously receiving FM broadcasts on a TV, all of the plurality of diversity antennas used for the in-vehicle FM receiver are shared with some or all of the plurality of diversity antennas used for the in-vehicle TV receiver Therefore, an antenna switching means for switching a part or all of a plurality of diversity antennas used for the in-vehicle TV receiver between the in-vehicle TV receiver and the in-vehicle FM receiver is provided, and the in-vehicle TV receiver broadcasts the TV broadcast. When receiving, the antenna switching means is switched to the in-vehicle TV receiver, and when the TV broadcast is not being received by the in-vehicle TV receiver, the antenna switching means is switched to the in-vehicle FM receiver. An antenna switching method for an in-vehicle receiving system, characterized in that: 4. An in-vehicle TV receiver comprising: a vehicle-mounted TV receiver for performing diversity reception using a plurality of diversity antennas; and a vehicle-mounted FM receiver for performing diversity reception using a plurality of diversity antennas .
TV broadcasting alone reception, FM broadcasting alone with in-vehicle FM receiver
Reception, TV broadcast with on-board TV receiver and on-vehicle FM reception
A part of a plurality of diversity antennas used for an in-vehicle FM receiver is partially or entirely replaced with a part or all of a plurality of diversity antennas used for an in-vehicle TV receiver in an in-vehicle receiving system capable of simultaneously receiving FM broadcasts. An antenna switching means for switching a part or all of a plurality of diversity antennas used for the in-vehicle TV receiver between the in-vehicle TV receiver and the in-vehicle FM receiver is provided, so that the in-vehicle TV receiver can perform TV broadcasting. , The antenna switching means is switched to the in-vehicle TV receiver, and when the in-vehicle TV receiver is not receiving a TV broadcast, the antenna switching means is switched to the in-vehicle FM receiver. Antenna switching method for an in-vehicle receiving system. 5. An in-vehicle TV receiver comprising: an on-vehicle TV receiver for performing diversity reception using a plurality of diversity antennas; and an on-vehicle FM receiver for performing diversity reception using a plurality of diversity antennas .
TV broadcasting alone reception, FM broadcasting alone with in-vehicle FM receiver
Reception, TV broadcast with on-board TV receiver and on-vehicle FM reception
In the in- vehicle receiving system capable of simultaneously receiving FM broadcasts on a TV, all of the plurality of diversity antennas used for the in-vehicle FM receiver are shared with some or all of the plurality of diversity antennas used for the in-vehicle TV receiver Therefore, a part or all of the plurality of diversity antennas used in the in-vehicle TV receiver are connected to the in-vehicle TV receiver and the in-vehicle F receiver.
An antenna switching means for switching to an M receiver is provided, and a TV broadcast is received by an onboard TV receiver.
When the receiver does not receive FM broadcasts,
FM receiver for in-vehicle receiving TV broadcasting with receiver
If you are receiving FM broadcasts at
Switch the stage to the in-vehicle TV receiver and receive in-vehicle FM
FM broadcast is received by the TV and the TV is released by the on-board TV receiver.
When no transmission is received, switch the antenna switching means
Switching control means for switching to the on-board FM receiver ; 6. An in-vehicle TV receiver comprising: a vehicle-mounted TV receiver for performing diversity reception using a plurality of diversity antennas; and a vehicle-mounted FM receiver for performing diversity reception using a plurality of diversity antennas .
TV broadcasting alone reception, FM broadcasting alone with in-vehicle FM receiver
Reception, TV broadcast with on-board TV receiver and on-vehicle FM reception
A part of a plurality of diversity antennas used for an in-vehicle FM receiver is partially or entirely replaced with a part or all of a plurality of diversity antennas used for an in-vehicle TV receiver in an in-vehicle receiving system capable of simultaneously receiving FM broadcasts. In order to use both, a part or all of the plurality of diversity antennas used in the in-vehicle TV receiver are connected to the in-vehicle TV receiver and the in-vehicle F
An antenna switching means for switching to an M receiver is provided, and a TV broadcast is received by an onboard TV receiver.
When the receiver does not receive FM broadcasts,
FM receiver for in-vehicle receiving TV broadcasting with receiver
If you are receiving FM broadcasts at
Switch the stage to the in-vehicle TV receiver and receive in-vehicle FM
FM broadcast is received by the TV and the TV is released by the on-board TV receiver.
When no transmission is received, switch the antenna switching means
Switching control means for switching to the on-board FM receiver ; 7. An in-vehicle TV receiver for performing diversity reception using a plurality of diversity antennas and an in-vehicle FM receiver for performing diversity reception using a plurality of diversity antennas .
TV broadcasting alone reception, FM broadcasting alone with in-vehicle FM receiver
Reception, TV broadcast with on-board TV receiver and on-vehicle FM reception
In the in- vehicle receiving system capable of simultaneously receiving FM broadcasts on a TV, all of the plurality of diversity antennas used for the in-vehicle FM receiver are shared with some or all of the plurality of diversity antennas used for the in-vehicle TV receiver Therefore, an antenna switching means for switching a part or all of a plurality of diversity antennas used for the in-vehicle TV receiver between the in-vehicle TV receiver and the in-vehicle FM receiver is provided, and the in-vehicle TV receiver performs TV broadcasting. , The antenna switching means is switched to the in-vehicle TV receiver, and when the in-vehicle TV receiver is not receiving a TV broadcast, the antenna switching means is switched to the in-vehicle FM receiver. A vehicle-mounted receiving system, characterized by comprising switching control means for switching. 8. An in-vehicle TV receiver comprising: a vehicle-mounted TV receiver for performing diversity reception using a plurality of diversity antennas; and a vehicle-mounted FM receiver for performing diversity reception using a plurality of diversity antennas .
TV broadcasting alone reception, FM broadcasting alone with in-vehicle FM receiver
Reception, TV broadcast with on-board TV receiver and on-vehicle FM reception
A part of a plurality of diversity antennas used for an in-vehicle FM receiver is partially or entirely replaced with a part or all of a plurality of diversity antennas used for an in-vehicle TV receiver in an in-vehicle receiving system capable of simultaneously receiving FM broadcasts. An antenna switching means for switching a part or all of a plurality of diversity antennas used in the in-vehicle TV receiver between the in-vehicle TV receiver and the in-vehicle FM receiver is provided. When a broadcast is being received, the antenna switching means is switched to the in-vehicle TV receiver, and when the in-vehicle TV receiver is not receiving a TV broadcast, the antenna switching means is switched to the in-vehicle FM receiver. A vehicle-mounted receiving system, characterized in that switching control means for switching to (1) is provided.