JP2004023398A - Two-tuner radio receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-tuner radio receiver for switching reception operations of two identical tuners so as to attain the compatibility between network follow (NEF) reception for receiving FM broadcasting and data broadcast reception for road traffic information or the like. <P>SOLUTION: Both M, S tuners can receive FM broadcasting and vehicle information communications system (VICS) broadcasting. When the M tuner receives FM broadcasting and the reception electric field strength of the M tuner is a strong electric field of a level S15 or over, the S tuner is used for exclusively receiving the VICS. When the strength is a middle electric field from the level S15 to a level S14, the receiver applies time division processing of NWF reception of FM broadcasting and VICS reception to the S tuner. When the strength is a weak electric field from the level S14 to a level S13, the S tuner is used for exclusively receiving the NWF. Further, when the strength is a very weak electric field of the level S13 or below, the S tuner is used for exclusively receiving the VICS. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a two-tuner radio receiver having two tuners having the same reception function, and in particular, it is possible to achieve both network follow reception for audio broadcast reception and data broadcast reception such as road traffic information by FM. It relates to two tuner radio receivers.
[0002]
[Prior art]
The conventional diversity radio receiver has two tuners having the same reception function, and when receiving an audio broadcast, while receiving the audio broadcast with one tuner, the other tuner performs a network follow of the audio broadcast reception. And realized the optimal audio broadcast reception.
[0003]
Recently, in addition to normal audio broadcasting, data broadcasting using, for example, a road traffic information providing system (VICS (registered trademark)) has been performed. In order to be able to receive both normal audio broadcasts and road traffic information data broadcasts in an in-vehicle radio receiver, the frequencies in those broadcasts are different from each other. One tuner is required, and a total of three tuners are provided in the radio reception system.
[0004]
On the other hand, in an in-vehicle reception system having two tuners having the same reception function, two tuners can be obtained by simultaneously performing broadcast reception by a road traffic information providing system and DGPS reception by a satellite positioning system and performing time division processing. The proposal to be realized is made.
[0005]
Furthermore, it has been proposed that in a two-tuner receiving system, one tuner receives an audio broadcast and the other tuner receives a data broadcast, and the two tuners are selectively used.
[0006]
[Problems to be solved by the invention]
By the way, until now, the network follower related to the reception of the audio broadcast and the data broadcast reception of the road traffic information by the road traffic information providing system have not been performed in the two tuner reception system.
[0007]
Therefore, in a two-tuner reception system, as a method of performing both network follow for receiving audio broadcasts and receiving data broadcasts such as road traffic information, one tuner receives audio broadcasts, and the other tuner receives network follow candidate broadcasts. It is conceivable to perform time division processing for station search and reception of road traffic information data broadcasts.
[0008]
However, according to this method, if the vehicle moves to the weak electric field area of the network follow receiving station while receiving the road traffic information data broadcast, the broadcast wave receiving the audio broadcast is missed. Next, when the network follow search is started, there is no receiving broadcast station to be compared.
[0009]
Therefore, an object of the present invention is to provide a two-tuner radio receiver that can achieve both network follow reception for audio broadcast reception and data broadcast reception by a road traffic information providing system or the like.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, in a two tuner radio receiver that includes a first tuner and a second tuner and can receive different broadcast waves, the received electric field strength of the first tuner or the second tuner. When the level of the received field strength signal is high, the first broadcast wave and the second broadcast wave are separately received by the first tuner and the second tuner. When the level of the received electric field strength signal decreases, the first tuner receives the first broadcast wave, and the second tuner receives the network follow reception for the first broadcast wave and the second broadcast. And a control unit that controls switching of operation of wave reception.
[0011]
The level of the received electric field strength signal is divided into a strong electric field region, a middle electric field region, and a weak electric field region, and the control unit determines whether the received electric field strength signal corresponds to the electric field region. When the control is performed and the level of the received electric field strength signal is in the strong electric field region, the control unit transmits the first broadcast wave and the second tuner to the first tuner and the second tuner. When the reception electric field strength signal level is within the range of the middle electric field region, the control unit causes the first tuner to receive the first broadcast wave. The second tuner is switched to perform network division reception for the first broadcast wave and time-division processing of the second broadcast wave reception, and the level of the received electric field strength signal is the weak electric field. When in the range, the control unit performs operation control to cause the first tuner to receive the first broadcast wave and cause the second tuner to receive network follow reception with respect to the first broadcast wave. It was.
[0012]
Further, when the range of the weak electric field region is divided into a weak electric field region and a weak electric field region, and the level of the received electric field strength signal is in the range of the weak electric field region, the control unit, Operation control is performed so that the first tuner and the second tuner receive the first broadcast wave and the second broadcast wave separately.
[0013]
Further, one of the broadcast waves is an FM broadcast wave, the other is a data broadcast wave, or one of the broadcast waves is an AM broadcast wave, and the other is a data broadcast wave, The data broadcast wave is assumed to be a road information broadcast wave by a road traffic information providing system.
[0014]
The first tuner or the second tuner performs a reception operation of the data broadcast based on a reception frequency notification from a navigation system that processes the data of the road traffic information. Is within the range of the middle electric field region, the control unit switches the operation of the second tuner to network follow reception for the first broadcast wave at a timing for prohibiting notification of the reception frequency, The time division processing of the network follow reception and the road information broadcast wave reception is performed, and the time division time of the road information broadcast wave reception by the second tuner is a length capable of acquiring at least one round of the road traffic information. Say it.
[0015]
When the first tuner is receiving an FM broadcast wave, and the level of the received electric field strength signal is in the range of the middle electric field region, the control unit includes the first tuner and the second tuner. When the first tuner is receiving an AM broadcast wave, the control unit switches the second tuner to the data broadcast wave reception operation when the first tuner receives an AM broadcast wave. It was.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a two tuner radio receiver according to the present invention will be described with reference to the drawings. Here, the two tuner radio receiver is incorporated in, for example, an audio device that is one of in-vehicle electronic devices, and further transmits the received data to the navigation system in cooperation with the navigation system. It is connected so that it can.
[0017]
As previously considered, when both the network follow for receiving the audio broadcast and the data broadcast reception for the road traffic information are performed, the audio broadcast is received by one tuner, and the network follow candidate broadcast station by the other tuner In an in-vehicle two-tuner reception system that performs time-division processing of search for road traffic and data broadcast reception of road traffic information, when the vehicle is receiving road traffic information data broadcast, the vehicle is weak in the network follow reception broadcast station. When moving to the electric field area, if the broadcast wave of audio broadcast reception is missed, network follow-up becomes impossible.
[0018]
Therefore, in the two-tuner radio receiver of this embodiment, the search for the network follow candidate broadcast station and the reception of the data broadcast of the road traffic information are simply processed in a time division manner as in the conventional two-tuner reception system. Rather, if the tuner receives either the audio broadcast reception or the road traffic information data broadcast depending on the received electric field strength of the audio broadcast station, the audio reception is performed by one tuner. While performing reception, the other tuner performs time-sharing processing between network follow reception and reception of road traffic information data broadcast, or the other tuner switches between performing network follow reception, and two on-vehicle tuners are switched. In the radio receiver, both network follow search and road traffic information data broadcast reception are performed. It was decided to.
[0019]
A specific block configuration of the two tuner radio receiver according to the present embodiment is shown in FIG. In the same figure, only the tuner part as a radio receiver is shown, and although not shown in the figure, a normal audio or data processing unit is connected to the output side of the tuner part, Audio output or display output related to data is performed.
[0020]
A main tuner 1 and a sub tuner 2 are provided in the tuner portion of the two tuner radio receiver. Here, the main tuner 1 and the sub tuner 2 are tuners having the same reception function, but for the sake of convenience, the names “main” and “sub” are given for distinction. An antenna A1 is connected to the main tuner 1 and an antenna A2 is connected to the sub-tuner 2, and both the tuner 1 and the tuner 2 receive audio broadcasts or road traffic information data broadcasts. It has a function that can.
[0021]
Further, the tuner portion is provided with a voice changeover switch circuit 3 that is switch-controlled by the microcomputer 6 and an FM composite changeover switch circuit 4, and each of the voice changeover switch circuit 3 and the FM composite changeover switch circuit 4 is provided. The reception output signals of the main tuner 1 and the sub tuner 2 are input. The audio selector switch circuit 3 sends the received audio output to an audio processing unit connected downstream when the audio broadcast is received by either the main tuner 1 or the sub tuner 2. Further, when the FM composite changeover switch circuit 4 receives road traffic information data by either the main tuner 1 or the sub-tuner 2, the FM composite changeover switch circuit 4 sends the received composite output to a data processing unit connected downstream.
[0022]
By the way, the reception outputs of the main tuner 1 and the sub-tuner 2 are input to the audio comparison circuit 5, and when one tuner receives an audio broadcast, the other tuner broadcasts the same content as the audio broadcast. In order to perform network follow-up to search for broadcasting stations, whether or not they are the same broadcast audio is compared. The comparison result is sent to the microcomputer 6. Here, for example, if the main tuner 1 is receiving an audio broadcast of a specific broadcasting station, the sub-tuner 2 performs a network follow operation, and the microcomputer 6 sets the audio changeover switch circuit 3 to Switching control is performed so that the reception output signal of the main tuner 1 is output as sound.
[0023]
On the other hand, the microcomputer 6 receives the received electric field strength signal E1 received by the main tuner 1 and the received electric field strength signal E2 received by the sub tuner 2, and the microcomputer 6 receives the received electric field strength E1. Alternatively, switching in the voice changeover switch circuit 3 and the FM composite changeover switch circuit 4 is controlled in accordance with the magnitude of E2. Note that the S meter level of each tuner is used for the received electric field strength.
[0024]
In addition, although illustration is abbreviate | omitted about the structure which concerns on the tuning process regarding the main tuner 1 and the sub tuner 2, and a follow search process, what is normally known is used for these structures. Further, the VICS frequency to be received from the navigation system that requires road traffic information data is notified to the two tuner radio receiver, and the main tuner 1 or the sub tuner 2 performs VICS reception based on the VICS frequency. It has become.
[0025]
Next, the reception operation in the tuner part of the two tuner radio receiver according to the present embodiment as shown in FIG. 1 will be described with reference to FIGS. In addition, in the figure, (b) shows the reception operation of the tuner part in the two-tuner radio receiver of the present embodiment. In order to clarify the reception operation of the tuner part, (a) As a reference, an example of the reception operation of a conventional two tuner radio receiver is shown.
[0026]
First, FIG. 2 shows a case of FM broadcast reception set to an ON state so that a network follow operation is performed with respect to a two tuner radio receiver, and shows the magnitude of the reception electric field strength of the main tuner 1 or the sub tuner 2. Accordingly, a change state of the reception operation of the main tuner 1 or the sub tuner 2 is schematically shown. In the figure, the main tuner 1 is represented as an M tuner, and the sub-tuner 2 is represented as an S tuner.
[0027]
In FIG. 2, for the sake of convenience, it is assumed that the M tuner is receiving an FM audio broadcast from a specific broadcast station. Therefore, the range of the received electric field strength level S is based on the received electric field strength E1 of the M tuner. When the S tuner is receiving an audio broadcast, the level S range is based on the received electric field strength E2 of the S tuner. FIG. 2A shows the case of a conventional FM2 tuner radio receiver, and FIG. 2B shows the case of the two tuner radio receiver of this embodiment. Furthermore, the network follow is denoted as NWF, and the road traffic information providing system is denoted as VICS.
[0028]
The conventional two-tuner radio receiver shown in FIG. 2A is not capable of receiving data broadcasts by the road traffic information providing system (VICS). Within this range, the tuner section operates by receiving normal diversity reception by two tuners for audio broadcast reception of a specific broadcasting station.
[0029]
Next, when the received electric field strength is in the middle electric field region or the weak electric field region from level S12 to level S11, the audio broadcast is received while performing the NWF operation. Further, when the received electric field strength is equal to or lower than level S11 and is within the weak electric field range up to level S0 where reception is impossible, the NWF operation by the S tuner is suspended and the M tuner performs normal reception operation. Has been.
[0030]
In contrast to the conventional two-tuner radio receiver, the two-tuner radio receiver of the present embodiment is provided with a VICS reception operation, and as shown in FIG. Even when operating exclusively, the S tuner ensures that both NWF search operation and VICS reception operation are compatible, and even if the received electric field strength decreases, the broadcast wave of audio broadcast reception will not be missed. did. The reception electric field strength level of the M tuner receiving the audio broadcast is divided into four ranges, and the switching control of the reception operation between the M tuner and the S tuner will be described.
[In the case of a strong electric field range of level S15 or higher]
When the level S of the received electric field intensity E1 of the M tuner 1 is within the range of the strong electric field region equal to or higher than the level S15, the M tuner 1 can sufficiently normally receive the broadcast wave of the specific broadcasting station. There is no need to search for the same broadcast as the station. In this case, the M tuner 1 keeps the normal reception operation, and stops the NWF reception operation of the S tuner 2. The microcomputer 6 controls the voice changeover switch circuit 3 to output the voice received by the M tuner 1.
[0031]
Here, the Stuner 2 that no longer needs the NWF reception operation is caused to perform the VICS reception operation. The microcomputer 6 controls the FM composite changeover switch circuit 4 to output the VICS composite data received by the S tuner 2.
[0032]
Therefore, when the received electric field strength of the tuner that is receiving the audio broadcast is within the range of the strong electric field region of level S15 or higher, the two tuners receive the audio broadcast reception operation and the data broadcast reception of the road traffic information. The operation is controlled to be performed independently.
[When in the middle electric field region between level S15 and level S14]
When the reception electric field strength E2 of the M tuner 1 is in the middle electric field region from the level S15 to the level S14, the reception electric field strength E1 of the M tuner 1 is lower than the level S15, and therefore the NWF by the S tuner 2 A reception operation is required. However, even at this time, we want to continue the VICS reception by the S tuner 2 and to operate the audio broadcast when the NWF reception operation is temporarily resumed even if the NWF reception operation is temporarily interrupted. There is not much to miss the broadcast wave that is being received. Therefore, the S tuner 2 is controlled by the microcomputer 6 so that the VICS reception operation and the NWF reception operation can be time-division processed.
[0033]
Here, the time division processing of the VICS reception operation and the NWF reception operation in the tuner part of the two tuner radio receiver will be described according to the operation time chart shown in FIG.
[0034]
In FIG. 3, the tuner side operation by the tuner portion is shown in the upper stage, and the lower stage shows the navigation side operation by the navigation system in alignment with the time axis. The tuner side operation shows that the NWF operation and the VICS reception operation are alternately time-division processed.
[0035]
In order for the two tuners in the tuner part to receive the VICS, it is necessary to know the VICS reception frequency at which the road traffic information data necessary for the navigation system is broadcast. Therefore, the tuner part receives the VICS reception from the navigation system. The frequency is notified. The tuner part tunes to the notified VICS reception frequency and extracts road traffic information data from the received broadcast wave.
[0036]
Therefore, when the NWF operation and the VICS reception operation are time-shared in the tuner portion, the tuner portion switches and controls the NWF operation and the VICS reception operation in consideration of the timing of the VICS reception frequency notification from the navigation system. .
[0037]
First, at the timing t1 when the tuner of the tuner part ends the NWF operation, the microcomputer 6 of the tuner part transmits a VICS reception permission notification N1 to the navigation system. Since the S tuner has finished the NWF operation, the S tuner enters a standby state in preparation for the next reception. The time T2 from when the S tuner starts the NWF operation to the end thereof is determined according to the speed of the tuning operation of the S tuner, and is set to be at least enough to perform the tuning operation, for example, several tens of seconds.
[0038]
In the navigation system, after receiving the VICS reception permission notification from the tuner portion, the VICS reception frequency notification is sent to the tuner portion at timing t2 when data acquisition is necessary. Therefore, the tuner part performs VICS reception by the S tuner based on the VICS reception frequency by this notification, and sends the received road traffic information data to the navigation system.
[0039]
After obtaining a round of data related to the road traffic information, if further VICS reception is necessary, the navigation system sends a VICS reception frequency notification to the tuner portion at timing t3, and VICS reception to the tuner portion. Start receiving operation.
[0040]
Next, the tuner part transmits a VICS reception request prohibition notification to the navigation system at timing t4 when a predetermined VICS reception operation time T1 has elapsed. After this timing t4, the tuner portion does not receive the VICS reception frequency notification from the navigation system, and starts the NWF operation by the S tuner. At this time, since the M tuner can receive the FM audio broadcast, the S tuner can shift to the NWF operation by the comparison operation with the sound of the broadcast wave received by the M tuner.
[0041]
Note that the length of the VICS reception operation time T1 may be set dynamically so that at least one round of data can be acquired, and data acquisition is performed a plurality of times.
[0042]
As described above, by specifying the VICS reception operation time of the tuner portion by the timing of the VICS reception permission notification and the VICS reception request prohibition notification from the tuner portion to the navigation system, the NWF operation and the VICS reception operation of the tuner portion are defined. A time-sharing process can be realized.
[In the range of the weak electric field region between level S14 and level S13]
Next, when the received electric field strength E2 of the M tuner 1 is within the weak electric field region from the level S14 to the level S13, the received electric field strength E1 of the M tuner 1 is further decreased from the level S14. As a result, the reception status of the specific broadcast station 1 becomes worse, and the necessity of searching for the broadcast station of the same broadcast by the NWF reception operation of the S tuner 2 increases.
[0043]
Therefore, when the received electric field strength currently received by the audio broadcast is within the weak electric field range, the S tuner 2 is caused to perform the NWF reception operation exclusively, and the VICS reception operation is suspended.
[0044]
In this way, when the electric field is weak, the VICS reception is suspended, and the NWF reception is regarded as important to prevent the received broadcast wave from being missed.
[In the range of the weak electric field region between level S13 and level S0]
Furthermore, when the reception electric field strength E1 of the M tuner 1 is lower than the level S13 and is within the weak electric field region approaching the level S0 where the reception becomes impossible, it is difficult to receive the audio broadcast. Since the voice to be compared becomes unclear in the voice comparison circuit 5, the search by the N tuner reception of the S tuner 2 is given up.
[0045]
Therefore, the M tuner 1 is controlled to continue normal reception for the time being, but the S tuner 2 that has stopped NWF reception is switched to VICS reception only and operated.
[0046]
As described above, in the case of FM reception in which the NWF operation is set to the ON state with respect to the two tuner radio receiver, when the received electric field strength of the main tuner or the sub tuner is within the strong electric field region, the normal FM Both reception and VICS reception can be executed, and when it is within the range of the middle electric field region, the operations of VICS reception and NWF reception can be executed in a time-sharing manner so that both normal FM reception and VICS reception can be executed. did. In addition, when the electric field intensity of normal FM reception is within the range of the weak electric field region, the VICS operation is stopped, emphasis is placed on normal FM reception, and when the electric field strength is within the range of the weak electric field region, Switch to VICS reception only.
[0047]
As described above, in a radio receiver including two tuners, the operation of the two tuners is appropriately switched in accordance with the magnitude of the reception electric field strength of the tuner, thereby performing the network follow during FM reception. Data broadcasting reception of traffic information can be realized.
[0048]
In the two-tuner radio receiver described so far, the case of FM reception in which the network follow operation is set to the ON state has been shown. Next, an AM having a network follow operation using the two-tuner radio receiver. A case where reception is performed will be described. FIG. 4 shows the operation states of the two tuners at the time of AM reception using the same method as the state shown in FIG.
[0049]
In FIG. 4, for the sake of convenience, it is assumed that the M tuner is receiving an AM audio broadcast from a specific broadcast station. Therefore, the range of the received electric field strength level S is based on the received electric field strength E1 of the M tuner. When the S tuner is receiving an audio broadcast, the level S range is based on the received electric field strength E2 of the S tuner. FIG. 4A shows a case of a conventional two tuner radio receiver, and FIG. 4B shows a case of the two tuner radio receiver of the present embodiment.
[0050]
The conventional two-tuner radio receiver shown in FIG. 4 (a) is not capable of data broadcast reception (VICS) by the road traffic information providing system. In this range, only the M tuner receives the AM audio broadcast reception of the specific broadcasting station in the tuner portion, and the S tuner suspends reception.
[0051]
Next, when the received electric field strength is in the middle electric field region or the weak electric field region from the level S22 to the level S21, the AM audio broadcast is received while performing the NWF operation. Further, when the received electric field strength is equal to or lower than the level S21 and within the weak electric field region up to the level S0 where reception is impossible, the NWF operation by the S tuner is suspended and only the M tuner performs normal reception operation. Has been.
[0052]
In contrast to the conventional two-tuner radio receiver, the two-tuner radio receiver of the present embodiment is provided with a VICS reception operation. As shown in FIG. 4B, the M tuner receives AM audio broadcasts. Even when operating exclusively, the S tuner allows both NWF search operation and VICS reception operation to be compatible, and even if the received electric field strength decreases, the broadcast wave of audio broadcast reception will not be missed. I made it.
[0053]
Switching at the time of AM reception operation related to the two tuners related to the two tuner radio receiver of the present embodiment shown in FIG. 4B is the same method as switching at the time of FM reception operation shown in FIG. Done. In the case shown in FIG. 4B, the S tuner does not change to VICS reception and NWF reception, but the M tuner receives AM audio broadcast instead of FM audio broadcast reception. The FM audio broadcast reception of FIG. 2B is performed except that the lower limit levels of the strong electric field region, the middle electric field region, and the weak electric field region due to the received electric field strength level S are level S25, level S24, and level S23. This is the same as the operation switching of the two tuners in the two-tuner radio receiver, and the received electric field strength level S of the M tuner receiving the AM audio broadcast is similarly divided into four stages. Since the switching of the receiving operation between the S tuner and the S tuner is controlled, the description regarding the switching of the operation of the two tuners at the time of receiving the AM audio broadcast is omitted here.
[0054]
So far, in the two-tuner radio receiver according to the present embodiment, the operation switching control of the two tuners according to the level of the received electric field strength has been described using the case where the network follow reception is set to the ON state as an example.
[0055]
However, when the two tuner radio receiver is mounted on a vehicle, the network follow reception is normally set to the ON state by default. However, depending on the driver, the network follow reception is set to the OFF state. It is also possible to use it. As described above, even when the two tuner radio receiver according to the present embodiment is used with the network follow reception set to the OFF state, the operation switching control of the two tuners according to the level of the received electric field strength is performed. Will be explained.
[0056]
FIG. 5 is a schematic diagram relating to control of operation switching of the S tuner when NWF reception is set to the OFF state and the M tuner is receiving FM audio broadcast in the two tuner radio receiver shown in FIG. The operation switching control of the two tuners according to the level S of the received electric field strength E1 of the M tuner is shown.
[0057]
FIG. 5A shows the case of a conventional two-tuner radio receiver. When the M tuner is receiving FM audio broadcast, the received electric field strength E1 of the M tuner is in a range up to a predetermined level S31. In this case, the diversity reception by the usual two tuners is performed. When the received electric field strength is within the weak electric field range of level S31 or less, the reception of the S tuner is stopped and the diversity reception is stopped, and the M tuner performs normal FM audio broadcast reception alone.
[0058]
On the other hand, as shown in FIG. 5 (b), the two-tuner radio receiver of the present embodiment is different from the conventional one in the two tuners according to the received electric field strength level even during FM audio broadcast reception. The VICS reception is enabled by switching control of the operation.
[0059]
Assuming that the M tuner is receiving FM audio broadcast, when the received electric field strength E1 of the M tuner is within the range of the strong electric field region of level S33 or higher, the M tuner performs normal FM audio broadcast reception, At this time, the S tuner that is not performing the reception operation is caused to perform the VICS reception operation.
[0060]
Next, when the reception electric field strength E1 of the M tuner is in the middle electric field region from the level S33 to the level S32, switching to diversity reception by the M tuner and the S tuner is performed.
[0061]
Furthermore, when the received electric field strength E1 of the M tuner is lower than the level S32 and is within the weak electric field region, the M tuner receives normal FM audio broadcast reception, and the S tuner is switched to dedicated VICS reception. It is done.
[0062]
As described above, according to the two tuner radio receiver of the present embodiment, even when the NWF operation is set to the OFF state, the reception operation of the two tuners is switched and controlled according to the level of the received electric field strength. Therefore, FM audio broadcast reception and VICS reception can be made compatible.
[0063]
Further, it will be described with reference to FIG. 6 that VICS reception can be performed even when AM reception is performed in the two-tuner radio receiver of the present embodiment.
[0064]
FIG. 6A shows the receiving operation of two tuners in a conventional two-tuner radio receiver. During AM reception, the M tuner only performs normal AM reception, and the S tuner pauses reception and does not perform any reception operation.
[0065]
Therefore, as shown in FIG. 6B, in the 2-tuner radio receiver of this embodiment, if the M tuner is performing AM reception, the S tuner that has stopped receiving is dedicated to VICS reception. Switching control is performed. In this case, since the NWF operation is set to the OFF state, the two tuners individually perform AM reception or VICS reception without switching control of the two tuners according to the received electric field strength level. To do.
[0066]
As described above, the two-tuner radio receiver according to the present embodiment performs FM audio broadcast reception or AM reception, and performs network follow reception and road traffic information data broadcast reception according to the electric field strength level of the reception. In the same receiver, it was possible to achieve both network follow reception and data broadcast reception such as road traffic information.
[0067]
Each level that determines the range of the received electric field intensity for switching the receiving operation of the tuner, that is, the strong electric field region, the intermediate electric field region, the weak electric field region, and the weak electric field region is determined by the two tuner radio receivers. It is assumed that the vehicle is mounted on a vehicle, actually traveled on a road, measured, and selected so that the operation switching between the two tuners is optimally performed. The level set value is stored in the memory, and the stored set value is referred to when the microcomputer executes the operation switching control.
[0068]
In addition, the range of the received electric field strength level is not limited to four stages, and the receiving operation switching control for the two tuners according to the present embodiment is appropriately executed by dividing the range into a plurality of ranges of at least two or more stages. Can do.
[0069]
【The invention's effect】
According to the two-tuner radio receiver of the present invention, it is possible to realize both network follow of audio broadcast reception and data broadcast reception by a road traffic information providing system or the like.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a receiving unit of a two tuner radio receiver used in the present embodiment.
FIG. 2 is a diagram for explaining a reception operation of two tuners at the time of network follow-on corresponding to the electric field strength of FM reception.
FIG. 3 is a diagram illustrating a time division operation of VICS reception and network follow reception.
FIG. 4 is a diagram for explaining a reception operation of two tuners when network follow-on corresponding to an AM reception electric field strength is ON.
FIG. 5 is a diagram for explaining a reception operation of two tuners at the time of network follow-off corresponding to the electric field strength of FM reception.
FIG. 6 is a diagram for explaining a reception operation of two tuners at the time of network follow-off corresponding to the electric field strength of AM reception.
[Explanation of symbols]
1 ... Main (M) tuner
2 ... Sub (S) tuner
3 ... Voice selector switch circuit
4 ... FM composite changeover switch circuit
5 ... Voice comparison circuit
6 ... Microcomputer
A1, A2 ... Antenna

Claims (14)

In a two tuner radio receiver having a first tuner and a second tuner and capable of receiving different broadcast waves,
An electric field strength signal output unit for outputting a received electric field strength signal of the first tuner or the second tuner;
When the level of the received electric field strength signal is high, the first tuner and the second tuner are caused to receive the first broadcast wave and the second broadcast wave separately, and the level of the received electric field strength signal is lowered. And a control unit that controls the switching of the operation of the network follow reception with respect to the first broadcast wave and the reception of the second broadcast wave with respect to the second tuner. 2 tuner radio receiver. The level of the received electric field strength signal is divided into a strong electric field region, a middle electric field region, and a weak electric field region, and the control unit performs control according to the electric field region to which the received electric field strength signal corresponds. The two-tuner radio receiver according to claim 1, wherein When the level of the received electric field strength signal is within the range of the strong electric field region, the control unit sends the first broadcast wave and the second broadcast wave to the first tuner and the second tuner. The two tuner radio receiver according to claim 2, wherein the two tuner radio receivers are separately received. When the level of the received electric field strength signal is in the middle electric field range, the control unit causes the first tuner to receive the first broadcast wave, and causes the second tuner to receive the first broadcast wave. 4. The two-tuner radio receiver according to claim 2, wherein operation switching is performed to perform time-sharing processing between network follow reception for broadcast waves and reception of the second broadcast wave. When the level of the received electric field strength signal is in the range of the weak electric field region, the control unit causes the first tuner to receive the first broadcast wave and causes the second tuner to receive the first broadcast wave. 5. The two-tuner radio receiver according to claim 2, wherein operation control for performing network follow reception with respect to a broadcast wave is performed. The range of the weak electric field region is divided into a weak electric field region and a weak electric field region,
When the level of the received electric field strength signal is in the range of the weak electric field region, the control unit sends the first broadcast wave and the second broadcast wave to the first tuner and the second tuner. 6. The dual tuner radio receiver according to claim 5, wherein the operation is controlled separately. 7. The two tuner radio receiver according to claim 1, wherein one of the broadcast waves is a broadcast wave by FM broadcasting, and the other is a broadcast wave by data broadcasting. 7. The two tuner radio receiver according to claim 1, wherein one of the different broadcast waves is an AM broadcast wave and the other is a data broadcast wave. 9. The two tuner radio receiver according to claim 7, wherein the data broadcast wave is a road information broadcast wave by a road traffic information providing system. The said 1st tuner or the said 2nd tuner performs reception operation | movement of the said data broadcast based on the notification of the receiving frequency from the navigation system which processes the data of the said road traffic information. Tuner radio receiver. When the level of the received electric field strength signal is in the range of the middle electric field region, the control unit performs the operation of the second tuner with respect to the first broadcast wave at a timing for prohibiting notification of the received frequency. 11. The dual tuner radio receiver according to claim 10, wherein switching to network follow reception is performed, and time division processing is performed between the network follow reception and the road information broadcast wave reception. The two-tuner radio receiver according to claim 11, wherein the time-division time for receiving the road information broadcast wave by the second tuner is a length that allows at least one round of data of the road traffic information to be acquired. When the first tuner is receiving an FM broadcast wave, and the level of the received electric field strength signal is in the range of the middle electric field region, the control unit uses the first tuner and the second tuner. The dual tuner radio receiver according to claim 7, wherein operation switching control is performed for diversity reception. 9. The control unit according to claim 8, wherein when the first tuner is receiving an AM broadcast wave, the control unit controls the second tuner to switch to the data broadcast wave reception operation. Tuner radio receiver.

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