JP2007189388A - Broadcasting receiver, method for adjusting receiving characteristic, and control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply provide a parameter for adjusting receiving characteristics at the current place of a mobile body inexpensively. <P>SOLUTION: A place detector detecting the current place of the mobile body, and a receiver receiving a representative-place parameter used for adjusting receiving characteristics at a specified representative place in a broadcasting region containing the current place of the mobile body, are fitted to a broadcasting receiver. A computer obtaining a current-place parameter used for adjusting receiving characteristics at the current place of the mobile body on the basis of the representative place parameter and the current place of the mobile body, and a receiving-characteristic adjuster adjusting receiving characteristics on the basis of the current-place parameter, are further fitted to the broadcasting receiver. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a broadcast receiving apparatus, a reception characteristic adjusting method, and a control program that are mounted on a mobile body and receive a broadcast.

2. Description of the Related Art Conventionally, a vehicle-mounted receiving device that includes a position detection unit that detects a current position of a vehicle and controls reception characteristics according to the current position detected by the position detection unit is known.
As such a device, for example, in order to improve adjacent interference, a parameter suitable for the current position is selected and received from parameters prepared in advance according to the current position of the vehicle detected by the position detection unit. Some change the bandwidth (for example, see Patent Document 1).
Further, when the position detection unit detects that the vehicle is located in an area where reception interference such as intermodulation interference or strong input interference occurs, an automatic gain control (AGC) circuit in the area previously stored in a storage device or the like There is also a receiving apparatus in which the AGC circuit is set in an optimal state according to an optimal adjustment point (see, for example, Patent Document 2).

Furthermore, in order to improve the discomfort caused by multipath interference and sound fluctuation caused by changes in electric field strength, it is suitable for the current position from the parameters prepared in advance based on the current position of the vehicle detected by the position detector. There are also known receivers equipped with an automatic sound quality control (ATC) circuit and an automatic separation control (ASC) circuit that select and set parameters for obtaining reception characteristics and adjust reception characteristics based on the selected parameters. (For example, refer to Patent Document 3).
JP-A-6-104786 JP-A-7-202641 Japanese Patent Laid-Open No. 2004-241907

However, in the above conventional receiving apparatus, a predetermined broadcast area is divided into a plurality of areas in advance, and a parameter corresponding to the current position of the vehicle is selected from parameters prepared for each area. It was. For this reason, it is necessary to set parameters in advance for each of a plurality of areas that are finely divided for each broadcasting area. To that end, a radio wave condition is investigated for each area, and the parameters are set in advance for each area. It was very laborious and expensive to do. In addition, since parameters must be prepared for each individual area in this way, it is necessary to construct a database with a huge amount of data, which also takes time and effort.
Accordingly, an object of the present invention is to easily and inexpensively construct a database for providing a current position parameter that can be adjusted to an optimal reception characteristic and that adjusts the reception characteristic at the current position of a mobile object. It is an object of the present invention to provide a broadcast receiving apparatus, a reception characteristic adjusting method, and a control program.

In order to solve the above problems, a broadcast receiving apparatus of the present invention includes a position detection unit that detects a current position of a mobile object, and a representative position for adjusting reception characteristics to predetermined reception characteristics at a representative position in a predetermined broadcast area. Based on the acquisition unit for acquiring parameters, the representative position parameter corresponding to the broadcast area including the current position of the moving object, and the current position of the moving object with respect to the representative position, the reception characteristics at the current position of the moving object A calculation unit for obtaining a current position parameter for adjusting the reception position, and a reception characteristic adjustment unit for adjusting a reception characteristic based on the current position parameter.
According to the above configuration, the acquisition unit acquires the representative position parameter for adjusting the reception characteristic to the predetermined reception characteristic at the representative position in the predetermined broadcast area. The parameter calculation unit adjusts the reception characteristics at the current position of the moving body based on the representative position parameter corresponding to the broadcast area including the current position of the moving body and the current position of the moving body with respect to the representative position. The current position parameter of is obtained. For this reason, it is sufficient if there is a simple database in which each representative area parameter is associated with each broadcast area. One broadcast area is divided into a plurality of areas, and a preliminary radio wave survey is performed for each area. There is no need to set parameters in advance.

  In the above configuration, the current position parameter may be obtained by correcting the representative position parameter based on a distance between the representative position and the current position.

  Further, in the above configuration, when the current position of the mobile body is at a position where a plurality of broadcast areas overlap, the current position parameter that is obtained for each broadcast area can receive the broadcast most satisfactorily. The position parameter may be the current position parameter of the moving object at the position.

  Further, in the above configuration, a storage unit storing a representative position parameter database in which the representative position and the representative position parameter are associated with each broadcasting area is provided, and the acquisition unit includes the representative position parameter database from the representative position parameter database. The representative position parameter may be acquired. Alternatively, in the above configuration, the acquisition unit may acquire the representative position parameter by connecting to a representative position parameter database in which the representative position and the representative position parameter are associated with each broadcasting area via a communication network. Also good.

  In addition, the reception characteristic adjustment method of the present invention is a reception characteristic adjustment method for adjusting the reception characteristic of a broadcast receiving device. In the reception characteristic adjustment method, the process of detecting the current position of a mobile unit and the reception characteristic at a representative position in a predetermined broadcast area Based on the process of obtaining the representative position parameter for adjusting to the reception characteristics, the representative position parameter corresponding to the broadcast area including the current position of the mobile object, and the current position of the mobile object with respect to the representative position, A step of obtaining a current position parameter for adjusting a reception characteristic at a current position of the mobile body, and a step of adjusting a reception characteristic at the current position of the mobile body based on the current position parameter. To do.

In addition, the control program of the present invention includes a position detection unit that detects the current position of the moving body, and an acquisition unit that acquires a representative position parameter for adjusting the reception characteristic to a predetermined reception characteristic at a representative position in a predetermined broadcast area. And a control program for controlling adjustment of the reception characteristics of the broadcast receiving apparatus using a computer, the calculation unit for obtaining the current position parameter and a reception characteristic adjustment unit for adjusting the reception characteristics, and moving to the position detection unit To detect the current position of the body,
The acquisition unit acquires the representative position parameter, and the calculation unit uses the current position parameter to adjust reception characteristics at the current position of the moving body based on the representative position parameter and the current position of the moving body. And the reception characteristic adjusting unit adjusts the reception characteristic at the current position of the moving body based on the current position parameter.

  According to the present invention, since the current position parameter is obtained using the representative position parameter for adjusting the reception characteristic at the representative position in the predetermined broadcast area, the current position parameter for adjusting the reception characteristic at the current position of the mobile object. Can be constructed easily and at a low cost, and can be adjusted to the optimum reception characteristics at the current position of the mobile object.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration of a broadcast receiving apparatus 1 according to the present embodiment. The broadcast receiving apparatus 1 is mounted on a vehicle and receives broadcast radio waves such as radio broadcasts. As shown in FIG. 2, the vehicle V moves within the broadcast area A or across a plurality of broadcast areas (A ₀ , A ₁ , A ₂ , A ₃ (see FIG. 4)), but the broadcast area A (A ₀ , A ₁ , A ₂ , A ₃ ) include an interference wave generation source that generates an interference wave that affects the reception characteristics of the broadcast receiver 1 (hereinafter, the position where the interference wave generation source is located is referred to as a radio interference position). There may be. For this reason, depending on the position where the vehicle V has moved (the current position of the vehicle V), the broadcast may not be received satisfactorily due to the influence of interference waves or the like due to the positional relationship with the radio wave interference position D.

  Therefore, as shown in FIG. 1, the broadcast receiving apparatus 1 according to the present embodiment includes a position detection unit 2, a tuner unit 3, a storage unit 4, a control unit 5, and a signal processing unit 6. According to the current position of the vehicle detected by the detection unit 2, the current position parameter calculated based on the representative position parameter and the like described later in the signal processing unit 6 is used to reduce the influence of the interference wave and the like. The reception characteristics are optimally adjusted so that radio broadcasts and the like can be satisfactorily received at the current position of the vehicle V. Hereinafter, each component of the broadcast receiving apparatus 1 will be described.

  The position detection unit 2 detects the current position of the vehicle V (see FIG. 2) and outputs a current position detection signal to the control unit 5. The position detection unit 2 includes, for example, an antenna 21 (which may be a receiver) that receives GPS radio waves transmitted from GPS satellites. Based on the GPS radio waves, the position coordinates indicating the current location of the vehicle V, the traveling direction, Can be calculated and output to the control unit 5 as a position detection signal.

  The tuner unit 3 receives broadcast radio waves such as FM broadcasts and AM broadcasts broadcast from a broadcasting station via an antenna 31 and outputs a sound signal subjected to predetermined signal processing to the speaker 7. A reception characteristic adjustment unit 32 for adjusting reception characteristics when receiving broadcast radio waves is provided.

  The reception characteristic adjustment unit 32 includes a reception bandwidth setting unit, an AGC circuit setting unit, an HCC (high cut control) circuit setting unit, an SPC (separation control) circuit setting unit, and the like (not shown). Based on the position parameters, the reception bandwidth, AGC circuit, HCC circuit, SPC circuit, etc. are set, and the reception characteristics are optimally adjusted so as to reduce the influence of interference waves, etc. The broadcast receiving apparatus 1 enables the broadcast to be received satisfactorily.

The storage unit 4 performs good broadcasting at the representative position O (O ₀ , O ₁ , O ₂ , O ₃ ) in the broadcast area A (A ₀ , A ₁ , A ₂ , A ₃ ) (see FIGS. 2 and 4). The representative position parameter that holds the representative position parameter database that associates the representative position parameter used for optimally adjusting the reception characteristics with each broadcasting area A (A ₀ , A ₁ , A ₂ , A ₃ ). A database storage area 41 is provided. Moreover, it has the correction function storage area 42 which stores the correction function mentioned later. The storage unit 4 can be configured from, for example, a hard disk device, a reading device that can read data stored in a storage medium such as a CD-ROM or a DVD-ROM, and the like.

Here, the broadcast area A (A ₀ , A ₁ , A ₂ , A ₃ ) is a predetermined area related to the broadcast of one broadcast station as shown in FIG. An area (strong / medium electric field area) that is expected to be able to receive the broadcast of one broadcasting station well. That is, the broadcast area A (A ₀ , A ₁ , A ₂ , A ₃ ) refers to an area determined in advance by the electric field strength of the broadcast radio wave transmitted from the broadcast station (wireless station).

The broadcast area _{A (A 0, A 1,} A 2, A 3) representative position O of _{(O 0, O 1, O} 2, O 3) is a broadcast area _{A (A 0, A 1,} A 2, Any location in A ₃ ) can be defined as the representative position O (O ₀ , O ₁ , O ₂ , O ₃ ). For example, the representative position O (O ₀ , O ₁ , O ₂ , O ₃ ) may be used as the geographical center of each broadcasting area A (A ₀ , A ₁ , A ₂ , A ₃ ) It is good also as a point characterized by the situation of electromagnetic waves, such as the vicinity of a broadcasting station. At the representative position O (O ₀ , O ₁ , O ₂ , O ₃ ) determined in this way, the radio wave condition is investigated in advance, and the representative position O (O ₀ , O ₁ , O ₂ , O ₃ ) a reception bandwidth parameter for setting a reception bandwidth so that a broadcast can be satisfactorily received, an AGC circuit parameter for adjusting operating characteristics of an AGC circuit, an HCC circuit, an SPC circuit, etc. An HCC circuit parameter and an SPC circuit parameter are set, and each of these parameters set to values that can satisfactorily receive broadcasts at the representative position O (O ₀ , O ₁ , O ₂ , O ₃ ) is representative. It can be used as a position parameter.

  Here, the reception bandwidth parameter is a parameter for appropriately setting a reception bandwidth when mainly receiving the AM radio broadcast. When receiving an AM radio broadcast, the higher the reception bandwidth, the higher the sound is reproduced and the sound quality is improved. However, when the reception bandwidth is widened, it is easily affected by multipath interference, adjacent interference, weak electric field noise, and the like. Therefore, when an interference wave or the like is present in a band close to the frequency of the broadcast radio signal to be received, the influence of the interference wave is eliminated by narrowing the reception bandwidth at the expense of sound quality. This reception bandwidth parameter is a parameter used for setting an appropriate reception bandwidth.

  Further, the AGC circuit parameter is a parameter for setting the gain amount of the AGC circuit to an appropriate value in order to prevent volume fluctuation due to electric field level fluctuation of the received radio wave. The AGC circuit parameter is set to a value that decreases the gain when the electric field strength of the received radio wave is strong, and the gain is set when the electric field strength of the received radio wave is weak so that the gain amount of the AGC circuit becomes an appropriate value. A value that raises is set.

  The above HCC circuit parameters are parameters for setting the cutoff frequency of the high cut filter to an appropriate value. The HCC circuit is a circuit for cutting a high-frequency signal, and when receiving FM stereo broadcast, as a noise countermeasure at the time of a weak electric field, the high-frequency signal is intentionally cut to reduce audible noise. Things have been done. The HCC circuit parameter is a parameter used to appropriately set the cutoff frequency of the HCC circuit according to the electric field level being received. Note that the ATC circuit described in the background art of the present invention performs an operation conforming to the HCC circuit.

  The above SPC circuit parameters are parameters for appropriately setting the signal level at which separation control is started and the degree to which the separation is reduced.

  Here, the separation means the degree to which the left (or right) signal of stereo broadcasting leaks to the right (or left) output. When receiving the FM broadcast radio wave, if the SN ratio of the received signal is lowered to a certain level, the S / N ratio after demodulation is rapidly deteriorated. In addition, the signal-to-noise ratio after demodulation is worse when receiving FM stereo broadcast radio waves than when receiving FM mono broadcast radio waves. Therefore, when the signal-to-noise ratio of the received signal is reduced by using the SPC circuit, separation is intentionally performed at the expense of the sound spread and localization (right and left positions where the sound can be heard), which are the characteristics of stereo broadcasting. By weakening, the reception characteristics are adjusted by improving the discomfort caused by the sound fluctuation caused by the multipath interference and the change of the electric field strength.

  As described above, the SPC circuit parameter is a parameter for appropriately setting the signal level at which the SPC circuit starts to operate and the degree to which the separation is reduced. Note that the ASC circuit described in the background art of the present invention performs an operation conforming to the SPC circuit.

The correction function storage area 42 stores a correction function used when the signal processing unit 6 calculates the current position parameter using the representative position parameter.
A plurality of correction functions are prepared for each representative position parameter (reception bandwidth parameter, AGC circuit parameter, HCC circuit parameter, SPC circuit parameter). Then, the representative position parameter is appropriately corrected based on the positional relationship among the representative position O of the broadcast area A, the radio wave interference position D existing in the broadcast area A, and the current position V of the vehicle among the plurality of correction functions. A correction function that can be used is read out by the control unit 5 and transferred to the signal processing unit 6.

For example, the representative position parameter BW (x ₀ , y ₀ ) for the reception bandwidth parameter will be described. Correction functions C ₁ , C ₂ ,..., C _n are prepared in advance and stored in the correction function storage area 42 for the representative position parameter BW (x ₀ , y ₀ ) for the reception bandwidth parameter. The correction functions C ₁ , C ₂ ,..., C _n are functions of the distance ΔL between the representative position O and the current position of the vehicle V, respectively. Even when the distance ΔL between the representative position O (O ₀ , O ₁ , O ₂ , O ₃ ) and the vehicle V is equal, the representative position O of the broadcast area A (A ₀ , A ₁ , A ₂ , A ₃ ) (O ₀ , O ₁ , O ₂ , O ₃ ), the positional relationship between the radio disturbance position D existing in the broadcast area A (A ₀ , A ₁ , A ₂ , A ₃ ) and the current position V of the vehicle Depending on the situation, the broadcast receiving apparatus 1 is affected by the interference wave. Therefore, each of the correction functions C ₁ , C ₂ ,..., C _n represents the positional relationship between the representative position O of the broadcast area A, the radio disturbance position D existing in the broadcast area A, and the current position V of the vehicle. Considering this, the function formula is set so that the influence of the interference wave can be appropriately reduced.

That is, the correction function C _{1 is set} to be used when the vehicle V is in a direction opposite to the radio disturbance position D when viewed from the representative position O and is not particularly affected by the interference wave, and the correction function C ₂ is , located on the side of the interference position D the vehicle V is viewed from the representative position O, is set as being used when it is necessary to consider the influence of the interference wave, a correction function C _n, the vehicle V is representative position O It can be set to be used when it is coincident with the direction in which the radio wave disturbance position D is seen from the viewpoint and is strongly influenced by the interference wave (see FIG. 3).

  The control unit 5 is a so-called microcomputer and includes a CPU, a RAM, a ROM, and the like (not shown). The control unit 5 reads various control programs stored in the ROM into the RAM, and performs various processes such as a reception characteristic adjustment process described later by centrally controlling each part of the broadcast receiving apparatus 1 using a part of the RAM as a work area. Execute.

  Further, in the reception characteristic adjustment processing, the control unit 5 performs the appropriate correction according to the representative position parameter of the broadcast area A including the current position of the vehicle V according to the current position of the vehicle V and the current position of the vehicle V. The function is acquired from the storage unit 4 and transferred to the signal processing unit 6. That is, the control unit 5 selects the representative position O of the broadcast area A, the radio wave interference position D existing in the broadcast area A, and the current position of the vehicle from the plurality of correction functions stored in the correction function storage area 42. Depending on the positional relationship with V, an appropriate correction function is selected and acquired, and this is transferred to the signal processing unit 6.

For example, when the current position parameter is calculated using the representative value parameter BW (x ₀ , y ₀ ) for the reception bandwidth parameter described above, the representative position of the broadcast area A (A ₀ , A ₁ , A ₂ , A ₃ ). O (O ₀ , O ₁ , O ₂ , O ₃ ), the position of the radio disturbance position D existing in the broadcast area A (A ₀ , A ₁ , A ₂ , A ₃ ) and the current position of the vehicle V Depending on the relationship, the control unit 5 selects and acquires an appropriate correction function from the correction functions C _{1 to} C _n and passes it to the signal processing unit 6.

  The signal processing unit 6 (see FIG. 1) is based on the distance ΔL between the representative position O and the current position of the vehicle V and the representative position parameter in the broadcast area A including the current position of the vehicle V. The current position parameter is obtained according to the correction function delivered from 5.

In the following, the signal processing unit 6 uses the reception bandwidth parameters, and the vehicle V has the coordinate positions (x ₁ , y ₁ ), (x ₂ , y ₂ ), (x _n , y _n ), (x ₃ , y ₃ ), (x ₄ , y ₄ ), current position parameters BW (x ₁ , y ₁ ), (x ₂ , y ₂ ), (x _n , y _n ), (x ₃ , y ₃ ) And (x ₄ , y ₄ ) will be described.

(1) When the current position of the vehicle V is at the coordinate position (x ₁ , y ₁ ) When the current position of the vehicle V is at the coordinate position (x ₁ , y ₁ ) (the representative position O and the current position of the vehicle V ) And the line segment connecting the representative position O and the radio interference position D is 180 degrees), the vehicle V is seen from the representative position O (x ₀ , y ₀ ) as the radio interference position D. Therefore, the broadcast receiving apparatus 1 is not particularly affected by the disturbing wave. In this case, the control unit 5 reads the correction function C ₁ described above from the correction function storage area 42 and passes it to the signal processing unit 6. Using this, the signal processing unit 6 calculates the current position parameter BW (x ₁ , y ₁ ) by the following (Equation 1).
BW (x ₁ , y ₁ ) = BW (x ₀ , y ₀ ) + C ₁ (ΔL) (Equation 1)

When the value of the current position parameter BW (x ₁ , y ₁ ) obtained based on the above (Equation 1) is plotted against the distance ΔL between the representative position O and the current position of the vehicle V, for example, FIG. In the example shown, the current position parameter BW (x ₁ , y ₁ ) for the reception bandwidth parameter always takes the same value as the representative position parameter BW (x ₀ , y ₀ ). This is because the current position of the vehicle V is in the opposite direction to the radio wave interference position D, so there is no need to consider the influence of the interference wave. Therefore, the correction function C ₁ is represented by the representative position O and the current position of the vehicle V. And always takes the value C ₁ (ΔL) = 0, and the current position parameter BW (x ₁ , y ₁ ) is always BW (x ₁ , y ₁ ) = BW (x ₀ , This is because y ₀ ) = 9 kHz. However, this value of 9 kHz is set in accordance with the bandwidth (9 kHz) of each channel of AM broadcasting.

(2) When the current position of the vehicle V is at the coordinate position (x ₂ , y ₂ ) As shown in FIG. 2, the current position (x ₂ , y ₂ ) of the vehicle V is the representative position O (x ₀ , y _0). ), The angle formed by the line segment connecting the representative position O and the current position of the vehicle V and the line segment connecting the representative position O and the radio interference position D is In the case of about 40 degrees), since the broadcast receiving apparatus 1 needs to adjust the reception characteristics in consideration of the influence of the interference wave, in this case, the control unit 5 corrects the correction function C ₂ described above. The data is read from the function storage area 42 and transferred to the signal processing unit 6. Using this, the signal processing unit 6 calculates the current position parameter BW (x ₂ , y ₂ ) by the following (Equation 2).
BW (x ₂ , y ₂ ) = BW (x ₀ , y ₀ ) + C ₂ (ΔL) (Expression 2)

When the value of the current position parameter BW (x ₂ , y ₂ ) obtained based on (Equation 2) is plotted on the vertical axis and ΔL is plotted on the horizontal axis, for example, according to the value of ΔL as shown in FIG. A current position parameter BW (x ₂ , y ₂ ) of the vehicle V is obtained.

(3) When the current position of the vehicle V is at the coordinate position (x _n , y _n ) As shown in FIG. 2, the current position (x _n , y _n ) of the vehicle V is the representative position O (x ₀ , y _0). ) And a line segment connecting the representative position O and the current position of the vehicle V, and a line segment connecting the representative position O and the radio disturbance position D. In this case, the control unit 5 reads out the correction function C _n described above from the correction function storage area 42 and the broadcast receiving apparatus 1 is strongly affected by the interference wave. The signal is transferred to the signal processing unit 6. Using this, the signal processing unit 6 calculates the current position parameter BW (x _n , y _n ) by the following (Equation 3).
BW (x _n , y _n ) = BW (x ₀ , y ₀ ) + C _n (ΔL) (Equation 3)

When the value of the current position parameter BW (x _n , y _n ) obtained based on the above (Equation 3) is plotted on the vertical axis and ΔL is plotted on the horizontal axis, for example, according to the value of ΔL as shown in FIG. A current position parameter BW (x _n , y _n ) of the vehicle V is obtained.

(4) When the current position of the vehicle V is close to the representative position O For example, as shown in FIG. 2, the current position (x ₃ , y ₃ ) of the vehicle V is the representative position O (x ₀ , When the position is close to y ₀ ), that is, within a predetermined distance range from the representative position O (x ₀ , y ₀ ), the signal processing unit 6 uses the representative position parameter as the current position parameter of the vehicle V. Process to use.

(5) When the current position of the vehicle V is at the coordinate position (x ₄ , y ₄ ) (see FIG. 4) The signal processing unit 6 calculates the current position parameter as described above (1) to (4). , as in the case where the current position of the vehicle V is in the coordinates (x _4, y ₄₎ shown in FIG. 4, when a plurality of broadcast zones a _0, a _1, a ₂ is in the position overlapping the signal processing unit 6 represents distances ΔL ₀ , ΔL ₁ , between the representative positions O ₀ , O ₁ , O _{2 of the} broadcast areas A ₀ , A ₁ , A ₂ and the current position (x ₄ , y ₄ ) of the vehicle V. [Delta] L ₂ and the broadcast area a _0, a _1, representative position of _{a 2 O 0, O 1,} O 2 each broadcast area a _0, based on the set representative position parameters in, a _1, a ₂ each, each current The position parameter is obtained, and the parameter that can best receive the broadcast is received as the current position parameter at the current position of the vehicle V It passes sexual adjuster 32.

  The above describes the case where the current position parameter for the reception bandwidth parameter is obtained. However, other parameters for adjusting reception characteristics (AGC circuit parameter, HCC circuit parameter, SPC circuit parameter) are obtained in the same manner. Can do. That is, a correction function that is a function of the distance ΔL between the representative position O and the current position of the vehicle V is stored in the plurality of correction function storage areas 42, and is appropriately selected according to the current position of the vehicle V by the control unit 5. A correct correction function is transferred to the signal processing unit 6, and the signal processing unit 6 uses the representative position parameter transferred from the control unit 5, the correction function, and the distance ΔL between the representative position O and the current position. Determine the position parameter.

  Next, a reception characteristic adjustment process executed under the control of the control unit 5 will be described with reference to FIG. As the reception characteristic adjustment process starts, the control unit 5 sends a control command to the position detection unit 2 to detect the current vehicle position, and obtains the current position information of the vehicle V from the position detection unit 2 (step S1). .

Next, based on the current position information, the control unit 5 acquires the representative position parameter of the broadcast area A including the current position of the vehicle V from the representative position parameter database in the storage unit 4, and obtains the current position parameter from the representative position parameter. A correction function for obtaining is obtained (step S2). Here, when the current position of the vehicle V is at a position where a plurality of broadcast areas A (A ₀ , A ₁ , A ₂ , A ₃ ) overlap (for example, coordinate position (x ₄ , y ₄ )), Representative position parameters and correction functions in all broadcast areas A (A ₀ , A ₁ , A ₂ , A ₃ ) including the current position of the vehicle V are acquired.

  Next, the control unit 5 passes the current position information, the representative position parameter, and the correction function acquired in steps S1 and S2 to the signal processing unit 6 (step S3), and causes the signal processing unit 6 to calculate the current position parameter. .

  The signal processing unit 6 first determines whether or not the current position and the representative position O are close to each other (step S4), and if the current position of the vehicle V is within a predetermined distance range from the representative position O, that is, If the current position and the representative position O are close to each other (step S4: Y), the representative position parameter is transferred to the reception characteristic adjusting unit 32 as the current position parameter (step S5).

On the other hand, when the current position and the representative position O are outside the predetermined distance range, that is, when the signal processing unit 6 determines that the current position and the representative position O are not close to each other (step S4: N), The signal processing unit 6 obtains a distance ΔL between the representative position O and the current position of the vehicle V. Then, the current position parameter is obtained from the distance ΔL, the representative position parameter, and the correction function according to the calculation formula described above (step S6), and the obtained current position parameter is transferred to the reception characteristic adjusting unit 32 (step S5). Here, when the current position of the vehicle V is at a position where a plurality of broadcast areas A (A ₀ , A ₁ , A ₂ , A ₃ ) overlap (for example, coordinate position (x ₄ , y ₄ )), Of the current position parameters obtained for each broadcasting area A (A ₀ , A ₁ , A ₂ , A ₃ ), the parameter that can best receive the broadcast is transferred to the reception characteristic adjustment unit 32 as the current position parameter. .

  Then, the reception characteristic adjustment unit 32 adjusts the reception characteristic in the tuner unit 3 based on the current position parameter acquired from the signal processing unit 6 (step S7), and ends the process.

According to the broadcast receiving apparatus 1 of the present embodiment described above, as shown in FIG. 2 and FIG. 3, the representative position for adjusting the reception characteristic to the predetermined reception characteristic at the representative position O in the predetermined broadcast area A Since the current position parameters BW (x ₁ , y ₁ ), BW (x ₂ , y ₂ ),..., BW (x _n , y _n ) are obtained using the parameters BW (x ₀ , y ₀ ), the vehicle V A database for providing a current position parameter for adjusting the reception characteristic at the current position to the optimum reception characteristic can be constructed easily and at low cost. That is, according to the broadcast receiving apparatus 1 of the present embodiment, there is a simple representative position database in which representative position parameters are associated with each broadcast area A (A ₀ , A ₁ , A ₂ , A ₃ ). There is no need to divide the broadcast area of the position into a plurality of areas and prepare parameters for each area beforehand by radio wave survey or the like.

As shown in FIG. 2, when the current position (x ₃ , y ₃ ) of the vehicle V is close to the representative position O (x ₀ , y ₀ ), the representative position parameter BW (x ₀ , Since y ₀ ) can be used as it is as the current position parameter BW (x ₃ , y ₃ ), the load for obtaining the current position parameter can be reduced.

  The correction function is an angle formed by a line segment connecting the representative position O and the radio interference position D and a line segment connecting the representative position O and the current position of the vehicle V, that is, radio interference when viewed from the representative position O. An appropriate correction function is transferred to the signal processing unit 6 by the control unit 5 in accordance with the direction in which the current position of the vehicle V is located with respect to the position D, so that the signal processing unit 6 has a radio wave interference position D in the broadcast area A. It is possible to obtain a current position parameter having an appropriate value in consideration of the influence by the disturbing wave generated in step (1).

Furthermore, as shown in FIG. 4, when the current position of the vehicle V is at a position (x ₄ , y ₄ ) where a plurality of broadcast areas A ₀ , A ₁ , A ₂ overlap, each broadcast area A Of the current position parameters obtained for each of ₀ , A ₁ , and A ₂ , the parameter that can best receive the broadcast is set as the current position parameter at the current position of the mobile unit, so a plurality of broadcast areas A ₀ , A ₁ , Even when the vehicle moves to a position (x ₄ , y ₄ ) where A ₂ overlaps, the broadcast receiving apparatus 1 can receive the broadcast satisfactorily.

  In the above description, the broadcast receiving apparatus 1 is configured to include the storage unit 4 having the representative position parameter database storage area 41 and the correction function storage area 42. However, the present invention is not limited to this. It is good also as an external structure of the receiver 1. FIG. That is, the broadcast receiving apparatus 1 may be configured to be able to acquire a representative position parameter of the broadcast area A including the current position of the vehicle V and a correction function corresponding to the current position of the vehicle V. It is also possible to connect to a representative position parameter database or the like via a network such as the Internet and acquire the representative position parameters of the broadcast area A including the current position of the vehicle V.

  In the above description, the vehicle V is described as an example of the moving body, but the moving body is not limited to this. For example, the present invention may be applied to a mobile phone provided with a broadcast receiving apparatus 1 that can receive broadcasts in addition to a moving body as a vehicle, or may be applied to a portable radio or the like. When applied to a mobile phone, for example, the communication area of the base station is set as the broadcast area A, a predetermined representative position is set in the communication area of the base station, and parameters for adjusting the reception characteristics at the representative position are represented. It can be a position parameter.

In the above description, the value of the representative position parameter BW (x ₀ , y ₀ ) for the reception bandwidth parameter is 9 kHz in FIG. 3, and the range that the current position parameter can take is 9 kHz to 4 kHz. Of course, the present invention is not limited to this, and an appropriate value can be set as appropriate in order to adjust the reception characteristic to an optimum one. Further, C _{1 to} C _n are shown as correction functions, and current position parameters BW (x ₁ , y ₁ ), BW (x ₂ , y ₂ ), when correction functions C ₁ , C ₂ , and C _n are used, BW (x _n, y _n), and the representative position O and showed plotted against distance ([Delta] L) between the current position of the vehicle V, the current position parameter BW (x ₁ shown in FIG. 3 , Y ₁ ), BW (x ₂ , y ₂ ), and BW (x _n , y _n ) are merely examples.

It is a general | schematic block diagram of the receiver in embodiment. It is a conceptual diagram which shows the operation | movement image of the receiver in embodiment. It is a figure which shows the value of the present position parameter calculated | required using the correction function in embodiment. It is a conceptual diagram which shows the operation | movement image of the receiver in embodiment. It is a processing flowchart of an embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Broadcast receiving apparatus 2 Position detection part 3 Tuner part 4 Memory | storage part 5 Control part (acquisition part)
6 Signal processing part (calculation part)
32 reception characteristic adjustment unit 41 representative position parameter database storage area 42 correction function storage area A, A ₀ , A ₁ , A ₂ , A ₃ broadcast area O, O ₀ , O ₂ , O ₃ , O ₄ representative position

Claims (7)

A position detector for detecting the current position of the moving object;
An acquisition unit for acquiring a representative position parameter for adjusting a reception characteristic to a predetermined reception characteristic at a representative position in a predetermined broadcast area;
Based on the representative position parameter corresponding to the broadcast area including the current position of the moving body and the current position of the moving body with respect to the representative position, a current position parameter for adjusting reception characteristics at the current position of the moving body A calculation unit for obtaining
A reception characteristic adjustment unit that adjusts reception characteristics based on the current position parameter;
A broadcast receiving apparatus comprising: The broadcast receiving device according to claim 1,
The calculation unit obtains the current position parameter by correcting the representative position parameter based on a distance between the representative position and the current position;
A broadcast receiving apparatus characterized by the above. The broadcast receiving device according to claim 1 or 2,
The calculation unit, when the current position of the mobile body is at a position where a plurality of broadcast areas overlap, the current position parameter that can best receive the broadcast among the current position parameters determined for each broadcast area, The current position parameter of the moving object at
A broadcast receiving apparatus characterized by the above. In the broadcast receiving device according to any one of claims 1 to 3,
A storage unit that stores a representative position parameter database that associates each broadcast area with the representative position and the representative position parameter,
The acquisition unit acquires the representative position parameter from the representative position parameter database;
A broadcast receiving apparatus characterized by the above. In the broadcast receiving device according to any one of claims 1 to 3,
The acquisition unit is connected to a representative position parameter database that associates the representative position with the representative position parameter for each broadcasting area via a communication network, and acquires the representative position parameter.
A broadcast receiving apparatus characterized by the above. In the reception characteristic adjustment method for adjusting the reception characteristic of the broadcast receiving device,
Detecting the current position of the moving object;
Obtaining a representative position parameter for adjusting the reception characteristic to a predetermined reception characteristic at a representative position in a predetermined broadcast area;
Based on the representative position parameter corresponding to the broadcast area including the current position of the moving body and the current position of the moving body with respect to the representative position, a current position parameter for adjusting reception characteristics at the current position of the moving body The process of seeking
Adjusting the reception characteristics at the current position of the mobile based on the current position parameter;
A reception characteristic adjusting method comprising: A position detection unit for detecting the current position of the mobile object, an acquisition unit for acquiring a representative position parameter for adjusting the reception characteristic at a predetermined representative position in the broadcast area including the current position of the mobile object to the predetermined reception characteristic; In the control program for controlling the adjustment of the reception characteristics of the broadcast receiving apparatus including the calculation unit for obtaining the current position parameter and the reception characteristic adjustment unit for adjusting the reception characteristics, using a computer,
Let the position detection unit detect the current position of the moving body,
Let the acquisition unit acquire the representative position parameter,
Based on the representative position parameter and the current position of the moving body, the calculation unit is caused to obtain a current position parameter used for adjusting reception characteristics at the current position of the moving body,
Causing the reception characteristic adjustment unit to adjust the reception characteristic at the current position of the mobile body based on the current position parameter;
A control program characterized by

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