WO2007052695A1

WO2007052695A1 - Receiving device

Info

Publication number: WO2007052695A1
Application number: PCT/JP2006/321851
Authority: WO
Inventors: Tetsuya Kato; Yosuke Wada
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2005-11-02
Filing date: 2006-11-01
Publication date: 2007-05-10
Also published as: JP2007129389A

Abstract

A receiving device comprises a receiving unit for changing and receiving a common program being broadcast in different frequency bands in different areas. Further comprised are a storage unit stored with a change history of the frequency bands at the receiving unit, and a control unit for causing the receiving unit, in case the receiving device moves from an area to another, to change and receive the program broadcast of the different frequency bands on the basis of the change history stored in the storage unit.

Description

Specification

Receiver

Technical field

The present invention relates to a receiving device that receives a program broadcast.

Background art

A method and apparatus for receiving a DAB (Digital Audio Broadcasting) broadcast, which is a digital audio broadcast, is disclosed in Japanese Patent Application Laid-Open No. 2002-185414.

Hereinafter, a conventional receiving apparatus will be described with reference to the drawings. FIG. 13 is a block diagram of a conventional receiving apparatus. In FIG. 13, a receiving device 101 is connected to the output side of an antenna 102, receives a program broadcast in a specific frequency band, and receives a frequency band received by the receiving unit 103. The control unit 107 reads the reception frequency band information of the storage unit 108 and sets the frequency band in the reception unit. The receiving apparatus 101 also includes a demodulator 104 that demodulates the signal from the receiver 103, a signal processor 105 that decodes the signal from the demodulator 104, and a program that is a signal from the signal processor 105. And a playback unit 106 for playing back the broadcast.

[0004] Next, the operation of the receiving apparatus 101 configured as described above will be described. Here, as a broadcasting system, it is assumed that the same program broadcast is broadcast in different frequency bands in different areas such as the first area, the second area, and the third area. .

[0005] When receiving device 101 moves to the second area in the first area, receiving unit 103 derives from the reception history stored in storage unit 108 from the state of receiving a program broadcast in a certain frequency band. Based on the received reception frequency, in order to receive program broadcasts of different frequency bands including broadcast information indicating the same program broadcast, the reception setting is switched and received. In the following, the operation of switching reception settings and receiving is referred to as switched reception. For example, it corresponds to a technique called service linking in DAB broadcasting, which is digital audio broadcasting.

However, in such a conventional receiving apparatus 101, the control unit 107 simply stores data. Based on the reception frequency derived from the reception history stored in the unit 108, it was only switched to a different frequency band. For this reason, the possibility of selecting a frequency band that includes the same thread and broadcast in the second area was low. As a result, there is a problem that it takes time until the receiving unit 103 can receive the same program broadcast again.

Disclosure of the invention

[0007] The receiving device of the present invention is a receiving device including a receiving unit that switches and receives the same thread and broadcast that is broadcast in different frequency bands in different areas. A storage unit that stores a switching history of frequency bands, and when the receiving device moves from one area to another area, based on the switching history stored in the storage unit, the program broadcast of a different frequency band is stored in the receiving unit. And a control unit for switching reception.

[0008] With such a configuration, when the receiving device moves to a certain area force or another area, the control unit uses the same program broadcast based on the reception frequency derived from the switching history stored in the storage unit. A different frequency band having the highest probability of being is selected. As a result, there is a high possibility that the receiving unit can switch and receive the same program broadcast in different frequency bands. Therefore, it is possible to shorten the time until the receiving unit can receive the same thread and broadcast again.

Brief Description of Drawings

FIG. 1 is a block diagram of a receiving apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart of the operation of the receiving apparatus according to Embodiment 1 of the present invention.

FIG. 3 is a block diagram of a receiving apparatus according to Embodiment 2 of the present invention.

FIG. 4 is a flowchart of the operation of the receiving apparatus in the second embodiment of the present invention.

FIG. 5 is a block diagram of a receiving apparatus according to Embodiment 3 of the present invention.

FIG. 6 is a flowchart of the operation of the receiving apparatus according to Embodiment 3 of the present invention.

FIG. 7 is a block diagram of a receiving apparatus according to Embodiment 4 of the present invention.

FIG. 8 is a flowchart of the operation of the receiving apparatus in the fourth embodiment of the present invention. FIG. 9 is a block diagram of a receiving apparatus according to Embodiment 5 of the present invention.

FIG. 10 is a flowchart of the operation of the receiving apparatus according to Embodiment 5 of the present invention.

FIG. 11 is a block diagram of a receiving apparatus according to Embodiment 6 of the present invention.

FIG. 12 is a flowchart of the operation of the receiving apparatus in Embodiment 6 of the present invention.

FIG. 13 is a block diagram of a conventional receiving apparatus.

Explanation of symbols

[0010] 1 Receiver

2 Antenna

3 Receiver

7 Control unit

8 Memory unit

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0012] (Embodiment 1)

Hereinafter, the receiving apparatus according to the present embodiment will be described with reference to FIG. 1 and FIG. FIG. 1 is a block diagram of a receiving apparatus according to this embodiment.

In FIG. 1, the receiving device 1 is, for example, a radio tuner mounted on a vehicle.

The receiving device 1 includes an antenna 2 and a receiving unit 3 connected to the output side of the antenna 2. Further, the demodulating unit 4, the signal processing unit 5, and the reproducing unit 6 are connected to the output side of the receiving unit 3 in this order. A control unit 7 is connected to the reception unit 3, the demodulation unit 4, and the signal processing unit 5. The control unit 7 is connected to a storage unit 8 that stores a switching history of the receiving device 1.

[0014] The receiving unit 3 selects and receives a service that is a program broadcast in a specific frequency band from a plurality of ensembles that are signals in a plurality of frequency bands in the DAB broadcast received by the antenna 2. The receiving unit 3 receives information on the frequency band to be received and information from the control unit 7. Receive program broadcast information for a specific frequency band. The program broadcast received by the receiving unit 3 is demodulated by the demodulating unit 4, decoded by the signal processing unit 5, and reproduced by the reproducing unit 6.

In addition, the storage unit 8 stores a frequency band switching history for each program broadcast received by the receiving unit 3. The switching history is written and read by the control unit 7.

[0016] Here, the same program broadcast is broadcast in different first, second, and third frequency bands in different first, second, and third areas. Suppose. In this case, the operation of the frequency band switching process in the control unit 7 of the receiving apparatus 1 will be described with reference to FIG.

[0017] As an initial state, it is assumed that the receiving device 1 exists in the first area. First, in the start processing step (S1), the control unit 7 detects a request to receive a program broadcast of the first frequency band. This request is, for example, an operation input for receiving the first frequency band from the outside.

[0018] Next, the control unit 7 performs a program broadcast receiving step of receiving a program broadcast of the first frequency band (S2). The control unit 7 supplies information on the first frequency band program broadcast to the receiving unit 3, and the receiving unit 3 receives the first frequency band program broadcast.

Next, in the control unit 7, a movement detection step is performed (S3). In the movement detection step, when the control unit 7 detects that the first area force of the receiving device 1 also moves to the second area under some condition (YES in S3), the control history reading step is executed (S4 ). When the movement is not detected (NO in S3), the control unit 7 continues to receive the program broadcast of the first frequency band and performs the movement detection step at an appropriate timing.

In the switching history reading step (S 4), the control unit 7 reads the switching history from the storage unit 8. Next, the control unit 7 performs a second frequency band selection step (S5). In the second frequency band selection step, the control unit 7 selects the second frequency band having a high priority based on the switching frequency derived from the switching history. For example, the control unit 7 uses the switching frequency derived from the switching history to select the program broadcast in the second frequency band with the highest frequency as the switching destination. The switching history is, for example, the link destination information included in the DAB broadcast ensemble or the receiving device 1. This includes switching destination information for the same program broadcast obtained by searching the reception history information stored in advance.

[0021] When performing reception switching, two or more switching destinations may be indicated in the same program broadcast. When selecting one of these two or more switching destinations, the control unit 7 simply selects the switching destination based on the reception frequency derived from the reception history as in the conventional case. The second frequency band will be selected regardless of the movement characteristics. Therefore, there is a high possibility that the second frequency band does not include the same program broadcast, and as a result, it becomes necessary to select and receive the next frequency band, so the switching time becomes long. Let's do it. Therefore, it is expected that the same program broadcast in the second frequency band can be selected more accurately by using the switching frequency derived from the switching history and prioritizing the switching destination according to the moving characteristics of the receiving device 1. The

[0022] Next, in the control unit 7, a program broadcast receiving step of the second frequency band is performed (S6). In the second frequency band program broadcast receiving step, the control unit 7 supplies the selected second frequency band program broadcast information to the receiving unit 3, so that the receiving unit 3 transmits the second frequency band program broadcast. Switch reception.

Next, in the control unit 7, a switching history update step is performed (S7). In the switching history update step, the control unit 7 writes the switching history from the first frequency band to the second frequency band in the storage unit 8.

[0024] Thus, the probability that the control unit 7 is the same program broadcast based on the switching frequency derived from the switching history stored in the storage unit 8 when a certain area force also moves to another area. Select the different frequency band with the highest. As a result, there is a high possibility that the receiver 3 can switch and receive the same program broadcast in different frequency bands. As a result, it is possible to shorten the time until the receiving unit 3 can receive the same program broadcast again.

[0025] For example, when the receiving device 1 is a receiving device that moves within the same range every day or a radio receiving device that is installed in a vehicle and receives during commuting, the switching history of frequency bands in the commuting route is Since it is stored at a high frequency, the control unit 7 can determine the priority of such switching. As a result, it is possible to select the second frequency band that is less likely to fail as a switching destination, and the switching time can be shortened. [0026] The receiving unit 3 may be any one of analog broadcasting, digital broadcasting radio, and television, as well as those that receive the DAB broadcasting frequency band. Even in such a case, when the same program broadcast is broadcast in different frequency bands, the switching time can be shortened when it becomes necessary to switch the frequency band due to movement.

[Embodiment 2]

Hereinafter, the receiving apparatus according to the present embodiment will be described with reference to FIG. 3 and FIG. Note that, unless otherwise specified, the same as in the first embodiment.

FIG. 3 is a block diagram of a receiving apparatus according to the second embodiment. In FIG. 3, a reception quality detection unit 9 is provided between the reception unit 3 and the control unit 7. The reception quality detection unit 9 detects the reception quality of the signal in the frequency band received by the reception unit 3 and transmits the result to the control unit 7. This reception quality is, for example, reception strength or BER (Bit Error Rate) of the received signal.

Next, the operation of the frequency band switching process in the control unit 7 of the receiving apparatus 1 will be described with reference to FIG. The difference between FIG. 4 and FIG. 2 is that the processing in the movement detection step S3 is different.

[0030] In this movement detection step (S3), the control unit 7 obtains the reception quality information from the reception quality detection unit 9, and when the reception quality falls below a predetermined level, the control unit 7 starts from the first frequency band. Decide to switch to the second frequency band. The predetermined level of reception quality may be, for example, a BER that is about 10 times better than the limit BER that can be demodulated by the demodulator 4. In this way, troublesome switching can be prevented. In addition, when the state below the predetermined level continues for a predetermined time, switching to the first frequency band power and the second frequency band may be determined. The reason why the predetermined time has elapsed is that it is possible to prevent the complicated switching from occurring with a sufficient margin.

[0031] In this way, the control unit 7 detects the movement of the receiving device 1 by comparing an arbitrary threshold value with the reception quality of the program broadcast in the first frequency band. As a result, the frequency band switching time based on the switching history can be further shortened by detecting the movement in switching the frequency band of the received signal accompanying the movement.

Note that the reception quality detection unit 9 may or may not be included in the same IC as the reception unit 3. It does not have to be.

[Embodiment 3]

Hereinafter, the receiving apparatus according to the present embodiment will be described with reference to FIG. 5 and FIG. Note that, unless otherwise specified, the same as in the first embodiment.

FIG. 5 is a block diagram of a receiving apparatus in the third embodiment. In FIG. 5, the position information detection unit 10 is connected to the control unit 7. The position information detection unit 10 includes, for example, a GPS (G1 obal Positioning System) receiver, detects the geographical current position of the reception device 1, and transmits the result to the control unit 7.

Next, the operation of frequency band switching processing in the control unit 7 of the receiving apparatus 1 will be described with reference to FIG. The difference between FIG. 6 and FIG. 2 is that the processing in the movement detection step (S3) is different.

In this movement detection step (S 3), the control unit 7 acquires the position information from the position information detection unit 10 and reaches the specific range, so that the first area force of the receiving apparatus 1 Detects movement to the rear.

In this way, the control unit 7 detects the movement of the receiving device 1 based on the position information supplied from the position information detection unit 10 when moving to another area with a certain area force. As a result, the frequency band switching time based on the switching history can be further shortened by detecting the movement condition in frequency band switching accompanying movement.

[0038] (Embodiment 4)

Hereinafter, the receiving apparatus according to the present embodiment will be described with reference to FIG. 7 and FIG. Note that, unless otherwise specified, the same as in the first embodiment.

FIG. 7 is a block diagram of a receiving apparatus in the fourth embodiment. In FIG. 7, the time holding unit 11 is connected to the storage unit 8 and the control unit 7. The time holding unit 11 is a block that holds a time supplied from the outside by, for example, a built-in RTC (Real Time Clock), a timer function such as a microcomputer, or wireless broadcasting or wireless communication. The time holding unit 11 stores the time when the switching occurs in the storage unit 8 as a part of the switching history. Further, when the receiving device 1 moves to the first area force second area, the control unit 7 causes the receiving unit 3 to store the first information on the basis of the time information from the time holding unit 11 and the switching history stored in the storage unit 8. 2 frequency bands The program broadcast is switched and received.

Next, the operation of the frequency band switching process in the control unit 7 of the receiving apparatus 1 will be described with reference to FIG. 8 is different from FIG. 2 in that a time information reading step (S8) is provided after the movement detection step (S3).

In the time information reading step, the control unit 7 acquires time information from the time holding unit 11. The acquired time information is used as follows in the second frequency band selection step (S5) in which switching is selected.

[0042] In the second frequency band selection step, when the control unit 7 selects the second frequency band based on the switching history, the time information and time stored as part of the switching history are stored. The current time information of the holding unit 11 is compared with the current time information, and the second frequency band is selected based on the time information in the switching history that is within the predetermined range of the current time information force.

Furthermore, in the switching history update step (S 7), the control unit 7 stores the current time information in the storage unit 8 as part of the switching history when updating the switching history in the storage unit 8. The

[0044] As described above, the time information from the time holding unit 11 is stored as part of the switching history, and the time of the switching history is compared with the current time, so that the behavior characteristics of the receiving device 1 can be further improved. An adapted frequency band can be selected. As a result, it is possible to further reduce the time required for switching program broadcasting in the frequency band. For example, if the receiving device 1 is a receiving device provided in a vehicle for commuting, switching from the first frequency band to the second frequency band often occurs during work at 9:00 am When returning home at 5 o'clock, the control unit can determine the switching frequency depending on the current time that switching from the second frequency band to the third frequency band often occurs.

[Embodiment 5]

Hereinafter, the receiving apparatus according to the present embodiment will be described with reference to FIG. 9 and FIG. Note that, unless otherwise specified, the same as in the first embodiment.

FIG. 9 is a block diagram of a receiving apparatus in the fifth embodiment. In FIG. 9, the calculation unit 12 is connected to the storage unit 8 and the control unit 7. The computing unit 12 reads the switching history of the storage unit 8 and derives a switching list having the first frequency band selected first as the top element. Is stored in the storage unit 8. In this switching list, for example, switching destinations are arranged in order of switching frequency with respect to switching sources. By selecting elements of this switching list in order as switching destinations, it is possible to hold a switching information path such as a car navigation path.

Next, the operation of the frequency band switching process in the control unit 7 of the receiving apparatus 1 will be described with reference to FIG. The difference between Fig. 10 and Fig. 2 is that before the movement detection step (S3), a switching history reading step (S4) and a switching list creation / storage step (S9) are provided in order, and the movement detection step (S3 ) Is followed by a switching list reading step (S10).

In this switching history reading step (S 4), the control unit 7 acquires switching history information from the storage unit 8. The acquired switching history information is supplied to the calculation unit 12. In the switching list creation 'storage step (S9), the control unit 7 supplies the switching history information to the calculation unit 12, and causes the calculation unit 12 to derive a switching list by a predetermined method. This switching list is stored in the storage unit 8.

In the switching list reading step (S10), the control unit 7 reads the elements of the switching list from the storage unit 8 as the switching destination information. Compared with the first embodiment, this operation can omit the switching destination selection process based on the switching history, so that the time for the switching operation can be further shortened.

[0050] (Embodiment 6)

Hereinafter, the receiving apparatus according to the present embodiment will be described with reference to FIG. 11 and FIG. Note that, unless otherwise specified, the same as in the first embodiment.

FIG. 11 is a block diagram of a receiving apparatus in the sixth embodiment. In FIG. 11, an operation unit 13 is provided. As the operation unit 13, for example, a key input, a remote control input, or a touch panel having a display function is assumed. The receiving apparatus according to the present embodiment can select whether or not to select a different frequency band based on the switching history stored in the storage unit 8.

[0052] Next, the operation of the frequency band switching process in the control unit 7 of the receiving apparatus 1 will be described with reference to FIG. In Fig. 12, when switched reception mode is selected, The same as FIG. 2, FIG. 4, FIG. 6, FIG. 8, and FIG.

In the start process (S1), the control unit 7 waits for an input from the operation unit. Next, in the switching mode ON (ON) step (S11), the user selects the switching mode through the operation unit, and the control unit 7 selects the switching mode. When the switching mode is ON (YES in S11), the switching valid step (S12) is performed, and the control unit 7 validates the switching of the frequency band based on the switching history or the switching list. The subsequent processing is the same as in Embodiments 1, 2, 3, 4, and 5. On the other hand, when the switching mode is OFF (NO in S11), the switching invalidation step (S13) is performed, and the subsequent control unit 7 uses the switching history or the switching list in the switching process. Do not switch the band.

As described above, it is possible to select ON / OFF of the switching history or switching list mode in advance according to the user's intention. As a result, when moving within the action range in which the switching history or switching list is valid, mode on (ON) is selected, and mode off for movements such as trips that are performed less frequently. By selecting (OFF), unnecessary frequency band switching can be prevented.

Industrial applicability

[0055] The receiving device of the present invention selects an appropriate switching destination frequency band according to the user's behavior characteristics based on the switching history during frequency band switching processing in a certain program broadcast, and shortens the switching time. It can be used on mobile devices such as televisions and radios that receive broadcasts mounted on vehicles, and mobile terminals.

Claims

The scope of the claims

[1] A receiving device including a receiving unit for switching and receiving the same program broadcast broadcast in different frequency bands in different areas,

A storage unit that stores a switching history of the frequency band of the program broadcast in the receiving unit; and when the receiving device moves from one area to another area, based on the switching history stored in the storage unit. ! /, And a control unit that causes the reception unit to switch and receive the program broadcast of a different frequency band.

[2] It further includes a reception quality detection unit for detecting reception quality of the program broadcast received by the reception unit,

The control unit, when the reception quality detected by the reception quality detection unit falls below a predetermined level, based on the switching history stored in the storage unit, the program in a frequency band different from the reception unit The receiving device according to claim 1, wherein the broadcast is switched and received.

[3] It further includes a position information detection unit that detects position information of the receiving device,

When the position information detection unit detects that the reception device moves from an area to another area, the control unit determines whether the control unit stores the reception unit based on the switching history stored in the storage unit. The receiving apparatus according to claim 1, wherein the program broadcasts in different frequency bands are switched and received.

[4] It further has a time holding unit for holding time information,

The storage unit stores the time information from the time holding unit as the switching history of the program broadcast,

The receiving device according to claim 1, wherein the control unit causes the receiving unit to switch and receive the program broadcast of a different frequency band based on the time information stored in the storage unit.

[5] From the switching history stored in the storage unit, a switching list in which switching destinations are arranged in order of switching frequency is created, and further includes an arithmetic unit that stores the switching list in the storage unit, and the control unit The receiving device according to claim 1, wherein the receiving unit switches and receives the program broadcast of a different frequency band based on the switching list stored in the storage unit.

6. The control unit according to claim 6, wherein the control unit can select whether or not the receiving unit can switch and receive the program broadcast of a different frequency band based on the switching history stored in the storage unit. 1 The receiving device described in 1.