JPH08181625A - Fm multiplex broadcast receiver - Google Patents

Abstract

PURPOSE: To utilize information from a VICS effectively by using a multiplex broadcast decoder to decode data into original signal data and displaying the decoded data onto a display device thereby reducing a channel selection time. CONSTITUTION: A tuner 2 selects a required channel and an audio signal separated from a broadcast signal is inputted to a speaker 5, from which the audio signal is reproduced. Furthermore, the broadcast wave signal is demodulated by an FM multiplex broadcast demodulator 6 and the signal demodulated by a multiplex broadcast decoder 7 is decoded into original data signal. When a reception level from the tuner 5 is low, an arithmetic unit 8 calculates an electric field strength from the broadcast station broadcasting the same content to a position of its own vehicle to allow the tuner 2 to select a broadcast station with a highest electric field strength. In this case, the unit 8 uses a memory 9 and stores data in the case of calculation. Then the signal decoded by the decoder 7 is displayed on a display device 1. Then it is not required to search all stations in a broadcast list listing up the same content programs and the position of its own vehicle is grasped and the object broadcast station is selected through the calculation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FM multiplex broadcasting receiver for receiving FM multiplex broadcasting, and more particularly, the present invention relates to improvement of signal processing of an FM multiplex broadcasting receiver mounted on a mobile body.

[0002]

2. Description of the Related Art There is an FM multiplex broadcasting system which employs an RDS (Radio Data System) in which data of a broadcasting station list for broadcasting a program having the same content is multiplexed on an audio signal of a broadcasting program from a broadcasting station. FIG. 19 is a diagram showing a list of broadcast stations from which the FM multiplex broadcast receiver receives programs of the same content. As shown in the figure, the FM multiplex broadcast receiver displays a list of broadcasting stations that receive programs having the same content, for example, frequencies of the broadcasting stations, for example, 89.9 MHz, 77.6 MHz, 8
It stores 5.1 MHz ..., receives the broadcast stations in this list in order, and selects the broadcast station with the highest reception level. In other words, when the level of the station currently receiving 89.9 MHz is lowered, it is necessary to change the receiving station to another station in the list. Therefore, 77.6 MHz, 85.1 MHz ...
And the broadcast station is changed to receive, and the station with the highest reception level is selected. However, the FM multiplex broadcast receiver has a problem in that all stations broadcasting the same content program must be received once, and it takes time to select a station.

In addition, this FM multiplex broadcast receiver allows V
It is also possible to receive a transmission signal obtained by multiplexing traffic information data by ICS (road traffic information communication system). However, there is a problem that it is necessary to make the traffic information easier to use.

[0004]

SUMMARY OF THE INVENTION A first object of the present invention is to provide an FM multiplex broadcast receiver capable of shortening the channel selection time in view of the above problems. In view of the above problems, a second object of the present invention is to provide an FM multiplex broadcast receiver that can effectively utilize information from VICS.

[0005]

In order to solve the above problems, the present invention provides an FM multiplex broadcast receiver having the following configuration. That is, the FM multiplex broadcast receiver is
A tuner for tuning and selecting a required channel from multiplex broadcasting, a speaker for reproducing an audio signal separated from the selected broadcast wave signal, and an F for demodulating the selected broadcast wave signal.
M multiplex broadcast demodulator, multiplex broadcast decoder that restores the demodulated signal to the original data signal, a database unit that stores a database of positions, frequencies, outputs, and transmission heights of broadcasting stations, and a vehicle position If the reception level from the vehicle position detector that detects the signal and the tuner is low, calculate the electric field strength from the broadcasting station that broadcasts the same contents to the own vehicle position and select the broadcasting station with the strongest electric field strength as the tuner. There is provided an arithmetic unit, a memory used for storing data when the arithmetic unit calculates, and an indicator for displaying the restored data.

Further, GPS may be used as the vehicle position detector. Further, the arithmetic unit obtains the moving direction of the own vehicle from the automatic position detector, predicts a broadcasting station to be selected next from the moving direction of the own vehicle, and calculates the electric field strength when the receiving station is changed. You may make it possible to select a station without searching for a station. Further, a moving direction detector for detecting the moving direction of the vehicle is provided, and the arithmetic unit predicts a broadcasting station to be selected next from the moving direction of the own vehicle by the moving direction detector, and changes the electric field strength when the receiving station is changed. May be calculated to enable tuning without searching for another station.

Further, the arithmetic unit is provided with a change notifying unit for notifying that the broadcasting station has been changed, and the change notifying unit amplifies the synthesized sound signal and the speech synthesizing unit for outputting the synthesized sound of the broadcasting station change. And an speaker for reproducing the amplified combined signal. Further, the arithmetic unit is provided with a change notifying unit for notifying that the broadcast station has been received and changed, and the change notifying unit has a voice synthesizing unit for outputting a synthesized sound of the change of the broadcast station and the voice on the input side of the speaker. A switch that selectively switches the output of the synthesizing unit and the audio signal to the speaker may be provided.

Further, the arithmetic unit is provided with a change notifying unit for notifying that the reception of the broadcasting station has been changed, and this change notifying unit has a beep sound signal from the arithmetic unit and an audio signal to the speaker on the input side of the speaker. A switch for selectively switching between may be provided. Furthermore, the arithmetic device may be provided with a change notification unit having a lighting device that notifies that the broadcast station has been changed.

Further, the arithmetic unit is provided with a change command section for enabling the reception change of the broadcasting station, and the change command section performs a voice recognition of the change command of the broadcasting station and the voice recognition section. A microphone connected to the recognition unit may be provided. Further, the arithmetic unit may be provided with a reception level stabilizing section, and the reception level stabilizing section may smooth the reception level or sample and hold it.

The arithmetic unit acquires the reception levels from at least three broadcasting stations instead of the own vehicle information from the own vehicle position detector, and the positions, frequencies, and outputs of the broadcasting stations stored in the database unit. , Using the transmission height information,
Calculate the distance between each broadcasting station and the vehicle position from the formula of the electric field strength,
Draw a circle around each broadcasting station at this distance, and calculate the electric field strength from the broadcasting station broadcasting the same content to the own vehicle position with the center of the vicinity where each circle intersects as the own vehicle position You may make it a tuner select a strong broadcasting station.

The tuner may be two tuners, one for searching a broadcasting station and the other for receiving. In the computing device, the two circles intersect
Of the two points, find the smallest line segment between these points and the point that intersects with another circle, and let the points included at both ends of the minimum line segment be close to the vehicle position. Alternatively, two other points close to the own vehicle position may be obtained, and the coordinates of the center of gravity of the triangle formed by these three points may be set as the own vehicle position.

In the arithmetic unit, a triangle may be formed from the points where the circles intersect, the area of the triangle is obtained, and the center of gravity of the triangle having the minimum area may be the vehicle position. Road information having a road map may be stored in the database unit, and the display may display the traffic information of VICS on the road map in a pictorial or text display.

The memory may store the traffic information of the VICS, based on the area information included in the traffic information, by classifying the traffic information about the vehicle position.

[0014]

According to the FM multiplex broadcast receiver of the present invention, in the arithmetic unit, when the reception level from the tuner is low,
The selection time can be shortened by calculating the electric field strength from the broadcasting station broadcasting the same contents to the vehicle position and causing the tuner to select the broadcasting station having the strongest electric field strength. By using the GPS as the vehicle position detector, the vehicle position can be acquired for 24 hours, the position information is accurate, and the selection time is further shortened. The arithmetic unit obtains the moving direction of the own vehicle from the automatic position detector, predicts a broadcasting station to be selected next from the moving direction of the own vehicle, calculates the electric field strength when the receiving station is changed, and determines the other station. By making it possible to select a channel without searching, it is not necessary to calculate the electric field strength when switching the reception of the broadcasting station, and the channel selection time is further shortened. By providing the moving direction detector exclusively for detecting the moving direction of the vehicle, the moving direction at that time can be grasped. The arithmetic unit is provided with a change notifying unit for notifying that the broadcast station has been changed, and the change notifying unit outputs a synthesized sound for changing the broadcasting station, an amplifier for amplifying the synthesized sound signal, and an amplifier. By including a speaker that reproduces the generated combined signal, reception change can be confirmed by voice. This change notifying unit outputs the synthesized sound of the change of the broadcasting station, and selectively switches the output of the voice synthesizing unit and the voice signal to the speaker to the input side of the speaker,
The speaker is unnecessary, waste is reduced, and the system is inexpensive. The change notification unit is provided with a switch for selectively switching the beep sound signal from the arithmetic unit and the voice signal to the speaker on the input side of the speaker, so that the voice synthesizer is not used, so the system becomes inexpensive. . The arithmetic device is provided with a change notifying unit having a lighting device for notifying that the reception of the broadcasting station has been changed, so that it can be visually confirmed. The arithmetic unit is provided with a change command unit for enabling the reception change of the broadcasting station, and the change command unit is connected to the voice recognition unit for performing the voice recognition of the change command of the broadcasting station and the voice recognition unit. With a built-in microphone, you can operate safely without taking your hands off the steering wheel even when driving. The arithmetic unit is provided with a reception level stabilizing unit, and the reception level stabilizing unit smoothes the reception level or samples and holds the reception level to improve the accuracy of determination and calculation using the reception level. The arithmetic unit acquires reception levels from at least three broadcasting stations instead of the own vehicle information from the own vehicle position detector, and the positions, frequencies, outputs, and transmission heights of the broadcasting stations stored in the database unit. The distance between each broadcasting station and the vehicle position is calculated from the formula of the electric field strength using the information on the distance, and a circle is drawn around this broadcasting station at this distance. As a result, by calculating the electric field strength from the broadcasting station broadcasting the same contents to the own vehicle position and selecting the broadcasting station with the strongest electric field strength in the tuner, it is not necessary to use the own vehicle position detector. Will be cheaper. By using two tuners, one for searching a broadcasting station and the other for receiving, there is no interruption of voice or data during the tuning process. Of the two points where the two circles intersect, the arithmetic unit obtains the minimum line segment of these points and the point that intersects with another circle, and determines the minimum line segments at both ends. The calculation is performed by assuming that the included point is close to the own vehicle position, obtaining the other two points close to the own vehicle position in this way, and setting the barycentric coordinates of the triangle formed by these three points as the own vehicle position. Can be realized by software, and it becomes versatile. In the arithmetic unit, a triangle is formed from the points where the circles intersect, the area of this triangle is obtained, and the center of gravity of the triangle with the smallest area is set as the vehicle position. Sex comes to have. The display device can utilize the traffic information by displaying the VICS traffic information on the road map in a superimposed manner or by displaying characters. The memory divides the VICS traffic information based on the area information included in the VICS traffic, and stores the divided traffic information centering on the position of the own vehicle, so that the necessary information can be easily searched and the memory can be saved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an FM multiplex broadcast receiver according to a first embodiment of the present invention. As shown in the figure, the FM multiplex broadcast receiver includes diversity antennas 1-1 and 1-2 that receive FM multiplex broadcasts, and a tuner 2 that is connected to these antennas and that tunes and selects a desired channel from broadcast waves. ,
A multiplexer 3 which is connected to this and separates an audio signal from a composite signal in which an audio signal and a data signal are multiplexed, and an amplifier 4 which is connected to this and amplifies the audio signal,
A speaker 5 for reproducing an electric signal into voice, an FM multiplex broadcast demodulator 6 connected to the tuner 2 for L-MSK demodulating a composite signal, and connected to the demodulator for error correction of the demodulated signal into an original data signal. The FM multiplex broadcast decoder 7 to be restored, the arithmetic unit 8 which is connected to this and which inputs the reception level from the tuner 2 and outputs a frequency switching signal for channel switching to the tuner 2, and the arithmetic unit 8 which is connected to this and outputs the arithmetic result. A memory 9 for storing, a database unit 10 connected to the arithmetic unit 8 for storing data concerning a broadcasting station and supplying this data, a display unit 11 connected to the arithmetic unit 8 for displaying an arithmetic result, and connected to the arithmetic unit 8. The own vehicle position detecting unit 12 is provided which can grasp the own vehicle position and supplies the information of the own vehicle position. Here, the composite signal is the main channel (L + R) signal as a stereo signal,
Sub-channel (LR) signal, L-MSK (Level cont)
roiled Minimum Shift Keying) Consists of modulated data signals. Further, the database unit 10 stores the latitude and longitude (xn, y) as the position of the data regarding the broadcasting station.
n), output P, frequency fn, height h1 of the transmitting antenna
(M), the relative gain Gh of the antenna, etc. are stored.

FIG. 2 is a diagram for explaining the data necessary for the arithmetic unit 8 of FIG. 1 to automatically select stations having the same program content. As shown in this figure (a), a list of broadcasting stations having the same program content is added from the additional information on the broadcasting stations of FM multiplex broadcasting.
It is acquired from the FM multiplex decoder 7 and stored in the memory 9. When the current reception level of the receiving station becomes equal to or lower than a certain threshold value at which reception is impossible, the current vehicle position is acquired from the vehicle position detection unit 12 and stored in the memory 9. Based on the relationship between the distance and the electric field strength in this figure (b) and the relationship between transmission and reception in this figure (c), the arithmetic unit 8 determines the electric field strength at the latitude and longitude (x0, y0) of the current position by each broadcasting station in the list. Is calculated as follows.

Er = 7 (Gh · P) ^1/2 / r1 (V / m) (1) (2πh1h2 / λr ≦ 0.5) Er = 88 (Gh · P) ^1/2 / λr ² (V / M) (2) (2πh1h2 / λr> 0.5) Gh: Relative gain (times) of the transmitting antenna P: Radiated power (w) λ: Wavelength (m) In this way, the computing device 8 calculates As a result, it becomes possible to select the station with the highest electric field strength. The result of the channel selection thus displayed is displayed on the display 11 to inform the user. Therefore, conventionally, it was necessary to search all the stations in the broadcasting station list of the same content program, but in this embodiment, the broadcasting station to be switched can be selected by calculation by grasping the own vehicle position. , The selection time has been shortened.

As the vehicle position detecting section 12, specifically, a GPS (Global Positioning System) may be used. As a result, the own vehicle position can be obtained from GPS, and the own vehicle position can be acquired for 24 hours, the position information becomes accurate, and the selection time is further shortened. The height h2 (m) of the own vehicle position can be obtained as the own vehicle position. The arithmetic unit 8 can be further provided with the functions described below to shorten the time for selecting a broadcasting station.

FIG. 3 is a diagram showing an example in which a broadcasting station to be selected next is predicted from the moving direction of the own vehicle, and when the receiving station is changed, another station can be selected without searching. As shown in this figure (a), the broadcast stations A and B, which are currently receiving the broadcast station A and are transmitting the same program as shown in this figure (b) from the additional information,
Get a list of C, D, etc. It is also assumed that the vehicle is moving as shown in FIG. It is assumed that the reception level from the broadcasting station A is lowered and the arithmetic unit 8 switches to the broadcasting station B. At this time, the moving direction is also acquired by the vehicle position detector 12. If the vehicle position, the moving direction, and the list proceed as they are, the broadcasting station D which will be selected by the next switching is predicted and stored. If the mobile station moves, the reception level of the broadcasting station B decreases, and when switching to the next broadcasting station, if there is no change in the moving direction, the broadcasting station D is switched to the expected broadcasting station.

In this way, the work of calculating the electric field strength using the equations (1) and (2) at the time of switching the receiving broadcasting station is eliminated, and when the moving direction is the same, the channel selection time can be shortened more inexpensively. You can Further, as shown in FIG. 3C, the moving direction may be calculated and obtained based on the current own vehicle position and the previously obtained own vehicle position. The previous vehicle position is stored here.

FIG. 4 is a diagram showing an example using a moving direction detector for detecting the moving direction of the own vehicle. As shown in this figure,
The calculation device 8 is provided with a movement direction detector 13 that detects the movement direction of the vehicle. The moving direction detector 13 may be a magnetic sensor, for example. Such a moving direction detector 1
By using a magnetic sensor as 3, the movement direction of FIG. 3 (c) is calculated from the data of two points, the previous position and the current position. At that time, the movement direction can be grasped, so the time can be shortened further. Can be achieved.

FIG. 5 is a diagram showing a first example of a change notification unit for notifying the user of the change of the receiving station when automatically changing the receiving station. As shown in this figure, the arithmetic unit 8 is provided with a change notification unit 20. The change notifying unit 20 is connected to the arithmetic unit 8 and, for example, a voice synthesizing unit 21 that performs voice synthesizing with "reception station change" based on the reception station change signal,
An amplifier 22 connected to this for amplifying a voice synthesis signal,
A speaker 22 connected to this is provided with a speaker 22 for converting a voice synthesis signal into voice.

In this way, the addition of the change notification section 20 enables the user to confirm by voice that the arithmetic unit 8 has changed the receiving station. FIG. 6 is a diagram showing a second example which is a modification of the change notification unit 20 of FIG. As shown in the figure, the change notification unit 20 is installed between the voice synthesizing unit 21 connected to the output side of the arithmetic unit 8 and the multiplexer 3 and the amplifier 4 in FIG. A switch 24 for selectively selecting the output of 21.

Thus, comparing with the first example,
The speaker 23 and the amplifier 22 are unnecessary, waste is reduced, and the cost is reduced. FIG. 7 is a diagram showing a third example which is a modification of the change notification unit 20 of FIG. As shown in this figure, change notification 2
0 replaces the voice synthesis unit 21 of FIG.
Outputs a signal for beep sound to the switch 24. A beep sound generator may be separately provided outside the arithmetic unit 8.

In this way, since the voice synthesizer 21 is not used as compared with the first and second examples, the system becomes cheaper accordingly. FIG. 8 is a diagram showing a fourth example which is a modification of the change notification unit 20 of FIG. As shown in this figure, change notification 2
Reference numeral 0 has a lighting device 25 directly connected to the arithmetic unit 8 and notifies the change of the receiving station by lighting. The lighting device 25 may be an LED (Light-emitting Diode).

In this way, the change of the receiving station can be visually notified. FIG. 9 is a diagram showing a change command unit 30 for enabling the user to change the receiving station.
As shown in the figure, the change command unit 20 is connected to the arithmetic unit 8. The change command unit 30 is connected to the arithmetic unit 8 and recognizes a user's change command to convert it into a command signal, and a microphone connected to the voice recognition unit 31 to convert the user's change command sound into an electric signal. 32 and.

By providing the change command section 30 in this way, the system not only automatically selects a channel,
Users can now decide the timing of channel selection. For example, while listening to the broadcast (audio),
There are times when the user decides that the reception status is not good and wants to change to another broadcasting station. Further, by using the voice recognition device 31, it becomes possible to operate safely without releasing the hand from the steering wheel even when driving.

FIG. 10 is a diagram showing a reception level stabilizing unit for more accurately ascertaining the reception level, since the reception status (reception level strength) is determined based on the reception level.
As shown in the figure, a reception level stabilizing unit 40 is provided between the tuner 2 and the arithmetic unit 8 of FIG. The reception level stabilizing unit 40 is connected to the tuner 2 and is connected to the smoothing circuit 41 for smoothing the reception signal and connected to the smoothing circuit 41 to convert an analog signal into a digital signal and output it to the arithmetic unit 8.
/ D converter 42 (Analog to Digital Converter). The reception level stabilizing unit 40 is provided in the smoothing circuit 4
Instead of 1, etc., a sample and hold unit that holds the reception level may be used.

In this way, the reception level, which changes from moment to moment, is smoothed or sample-held, so that the determination using the reception level and the calculation of the vehicle position described later are performed. It becomes possible to grasp. FIG. 11 shows an FM according to the second embodiment of the present invention.
It is a figure which shows a multiplex broadcast receiver. This embodiment does not include the own vehicle position detecting device 12 of the first embodiment as compared with FIG. GPS or the like is used for the automatic position detecting device in the first embodiment, but since it is expensive, instead of this,
The vehicle position is obtained as follows.

12 and 13 show the tuner 2-2 of FIG.
FIG. 3 is a diagram showing a first example and a second example in which the arithmetic unit 8 calculates the relationship between the broadcasting station and the own vehicle position based on the reception level of FIG. The tuner 2-2 receives broadcast waves from at least three broadcasting stations and acquires the reception level thereof. At this time, broadcasting stations having the same transmission position are not selected from the data in the database. From the obtained reception level and database data (frequency of each broadcasting station, output, transmission height), the distance between each broadcasting station and the vehicle position is calculated by the following equation based on the above equations (1) and (2). calculate.

R = {49Gr · P / Er ² − (h 1 −h 2) ² } ^1/2 (km) (3) (2πh 1h 2 /λr≦0.5) r = {88h 1h 2 (Gr · P) ^{1 / 2} / λEr} ^1/2 (km) (4) (2πh1h2 / λr> 0.5) From the distance r obtained by the calculation of equations (3) and (4),
2, a circle group as shown in FIG. 13 is obtained. Where A, B,
C, D, etc. are broadcasting stations. If there is no error, the plurality of circles in FIGS. 12 and 13 intersect at one point, that is, this is the vehicle position. If an error occurs, multiple circles do not intersect at one point.
In this case, the own vehicle position is expected to be included in the shaded portions in FIGS. 12 and 13, and the point at the center of this shaded portion is the own vehicle position.

In this way, the tuner 2 and the arithmetic unit 8 are all that is required to detect the position of the own vehicle, and the system is inexpensive because no equipment such as GPS is required. FIG.
FIG. 4 is a diagram for explaining FIGS. 12 and 13 in more detail. The method of calculating the vehicle position shown in this figure is an example of the case where there are three broadcasting stations. With respect to the method of selecting candidate points as shown in this figure (a), it is determined which of the intersections a and b of the circles c1 and c2 is closer to the vehicle position. Focusing on the intersections c and d of the circles c1 and c3, a combination of the line segments ac, ad, bc, and bd having the minimum length is investigated. If the line segment ac is the smallest, it is determined that the point a of the intersections a and b of the circles c1 and c2 is closer to the vehicle position.

Similarly, two points e and c are selected. These are points e (using the intersection of circles c2 and c1) at intersections e and f of circles c2 and c3, and points c (using the intersection of circles c2 and c3) at intersections c and d of circles c3 and c1. Is. The barycentric coordinates of the selected triangle consisting of the three points a, e, and c are calculated and used as the vehicle position.

Regarding the method of selecting the candidate points as shown in FIG. 7B, when the circles c1 and c3 do not have an intersection point, 2 circles (c
The point dividing the center points of 1 and c3) into the radius ratio (R1, R3) of two circles is the representative point of the intersection of the two circles. When two circles contact each other, the contact point is used as the representative point. When the two circles do not have an intersection as described above, or when the intersections are in contact with each other, it is not necessary to make the determination based on the length of the above line segment.

As another method of selecting the minimum area, FIG.
In 4 (a), when three points are extracted from the intersection points a to f of the circle, a plurality of triangles are obtained by the combination. Here, when extracting three points, points a and b, c and d, e and f
Must not be selected at the same time. The center of gravity of the triangle having the smallest area among the plurality of triangles is set as the vehicle position.

In the above case, the number of broadcasting stations to be calculated is three, but even if the number of stations is more than that, "triangle"
The basic vehicle position calculation method is the same, except that the calculation for is a calculation for a polygon. Further, in the case of, when all the circles intersect at one point, the above-described calculation is not performed and the intersection is determined as the vehicle position.

In this way, the vehicle position can be determined by a simple method, and the vehicle position can be estimated when a plurality of circles do not intersect at one point. Since the calculation itself can be realized by software, it is versatile. FIG. 15 is a diagram showing an FM multiplex broadcast receiver according to the third embodiment of the present invention. In this figure, the configuration different from that of the second embodiment of FIG. 11 adopts a two-tuner system instead of the one-tuner system, and antennas 1-1 and 1-2 have separate tuners 2-1 and
2-2, one tuner 2-1 performs audio reproduction and data restoration processing, and the other tuner 2-2
Is directly connected to the arithmetic unit 8 without performing signal processing as described above, and provides a reception level. In the first embodiment of FIG. 1 as well, the two-tuner system may be used.

By adopting the two-tuner system in this way, if one tuner is received for the next receiving station search and the current receiving station is received by the other tuner, the voice or the voice during the next channel selection processing can be obtained. There is no data interruption. The method of calculating the vehicle position shown in FIGS. 12 to 15 can be used not only in the FM multiplex broadcast receiver but also in the AM broadcast receiver.

FIG. 16 shows an FM according to the fourth embodiment of the present invention.
It is a figure which is a multiplex broadcast receiver and shows the example which receives VICS information. This figure has almost the same structure as FIG. 1, but
This FM multiplex broadcast receiver receives VICS traffic information together with broadcast voice and data of a broadcasting station, reproduces it as voice, and restores traffic information data. A vehicle direction detector 13 is connected to the arithmetic unit 8, and the database 10 has road-related data. The display 11 displays the character information 2
A line display or a road map display is used.

FIG. 17 is a diagram showing an example of VICS traffic information displayed on the display 11 of FIG. As shown in this figure (a), VICS traffic information, such as traffic congestion, regulation, and one-way information, is displayed as a picture in the map information from the database regarding the vehicle position to the destination. This figure (b)
Character information as shown in, "National highway No. 2 ○ × near traffic jam 2km" ..., "One-way traffic near National Highway No. 2 △ □", ...
Display the "Hanshin Expressway XX Inter Entrance Restriction" point.

FIG. 18 is a diagram showing an example of storing the traffic information by VICS in the memory 9 based on the area information. V
The traffic information of the ICS includes a secondary mesh code obtained by dividing the area with a secondary mesh as regional information together with the traffic information. As shown in the figure, based on the secondary mesh code, the received data is divided into corresponding sections (for example, one section of 10 km square) and stored in the memory 9 around the own vehicle position.

In this way, by storing a large amount of traffic information data sent from the VICS by limiting it to only data relating to the direction of travel of the user, the data can be organized and referred to. In other words, it makes it easier for the user to search for the information required in relation to the vehicle position, and also saves memory because the data is organized and saved.

[0043]

As described above, according to the present invention, when the reception level from the tuner is low, the electric field strength from the broadcasting station broadcasting the same contents to the vehicle position is calculated and the electric field strength is the strongest. Since the tuner selects the broadcasting station, the selection time can be shortened. Since GPS is used, the vehicle position can be acquired 24 hours a day, the position information is accurate, and the selection time is further shortened. Obtain the moving direction of the own vehicle from the automatic position detector, predict the next broadcasting station to tune from the moving direction of the own vehicle, calculate the electric field strength when changing the receiving station, and select the station without searching for other stations Since it is possible, the broadcasting station does not need to calculate the electric field strength when switching the reception, and the tuning time is further shortened. Since the moving direction detector for detecting the moving direction of the vehicle is exclusively provided, it becomes possible to grasp the moving direction at that time. Since the voice synthesizer for outputting the synthesized sound of the broadcast station change, the amplifier for amplifying the synthesized sound signal, and the speaker for reproducing the amplified synthesized signal are provided, the reception change can be confirmed by voice. If the output of the voice synthesizer and the voice signal to the voice speaker are selectively switched, the speaker becomes unnecessary, waste is eliminated, and the system becomes inexpensive. If the beep signal is used, the system is inexpensive because the voice synthesizer is not used. The reception change notification can be visually confirmed by the lighting device. The voice recognition unit that performs voice recognition of the change command of the broadcasting station allows safe operation without having to remove the hand from the steering wheel even when driving. The reception level stabilizing unit for the arithmetic unit can increase the accuracy of determination and calculation using the reception level by smoothing or sample-holding the reception level. The computing device obtains the distance between each broadcasting station and the own vehicle position from the formula of the electric field strength, draws a circle around this broadcasting station at this distance, and sets the center of the neighborhood where each circle intersects as the own vehicle position. The system becomes inexpensive because the tuner calculates the electric field strength from the broadcasting station that broadcasts the content to the vehicle position and selects the broadcasting station with the strongest electric field strength. If two tuners are used, one for broadcasting station search and the other for reception, there will be no interruption of voice or data during the tuning process. Of the two points where the two circles intersect, the arithmetic unit finds the minimum line segment of those points and the point that intersects with another circle, and includes them at both ends of the minimum line segment. If the point is close to the own vehicle position, two other points close to the own vehicle position are obtained in this way, and if the barycentric coordinates of the triangle formed by these three points are taken as the own vehicle position, the calculation is performed by software. It can be realized with and has general versatility. In the arithmetic unit, if a triangle is formed from the points where the circles intersect, the area of this triangle is determined, and if the center of gravity of the triangle with the smallest area is the vehicle position, the same calculation can be realized with software, and versatility is improved. To have. Display is VIC on the road map
Since the traffic information of S is displayed as a picture or a character, the traffic information can be utilized. The memory stores the VICS traffic information by dividing it based on the area information included in the VICS traffic information, so that the necessary information can be easily searched and the memory can be saved.

[Brief description of drawings]

FIG. 1 is a diagram showing an FM multiplex broadcast receiver according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating data necessary for the arithmetic unit 8 of FIG. 1 to automatically select a station having the same program content.

FIG. 3 is a diagram showing an example in which a broadcasting station to be selected next is predicted from the moving direction of the own vehicle, and when a receiving station is changed, another station can be selected without searching.

FIG. 4 is a diagram showing an example using a moving direction detector that detects a moving direction of a vehicle.

FIG. 5 is a diagram illustrating a first example of a change notifying unit that notifies a user of a change of the receiving station when the receiving station is automatically changed.

FIG. 6 is a diagram showing a second example which is a modification of the change notification unit 20 of FIG.

7 is a diagram showing a third example which is a modification of the change notification unit 20 of FIG.

FIG. 8 is a diagram showing a fourth example which is a modification of the change notification unit 20 of FIG.

FIG. 9 is a diagram showing a change command unit 30 for enabling a user to change a receiving station.

FIG. 10 is a diagram showing a reception level stabilizing unit for more accurately ascertaining the reception level in order to determine the reception status (reception level strength) based on the reception level.

FIG. 11 is a diagram showing an FM multiplex broadcast receiver according to a second embodiment of the present invention.

FIG. 12 is a diagram showing a first example in which the arithmetic unit 8 calculates the relationship between the broadcasting station and the vehicle position based on the reception level of the tuner 2-2 in FIG. 11.

13 is a diagram showing a second example in which the arithmetic unit 8 calculates the relationship between the broadcast station and the vehicle position based on the reception level of the tuner 2-2 in FIG.

FIG. 14 is a diagram illustrating FIGS. 12 and 13 in more detail. The method of calculating the vehicle position shown in this figure is an example of the case where there are three broadcasting stations.

FIG. 15 is a diagram showing an FM multiplex broadcast receiver according to a third embodiment of the present invention.

FIG. 16 is a diagram showing an example of an FM multiplex broadcast receiver according to a fourth embodiment of the present invention, which receives VICS information.

17 is a diagram showing an example of VICS traffic information displayed on the display 11 of FIG.

FIG. 18 is a diagram showing an example of storing traffic information by VICS in a memory 9 based on area information.

[Fig. 19] Fig. 19 is a diagram illustrating a list of broadcast stations from which an FM multiplex broadcast receiver receives a program having the same content.

[Explanation of symbols]

 2, 2-1, 2-2 ... Tuner 5 ... Speaker 8 ... Arithmetic device 9 ... Memory 10 ... Database 11 ... Display 12 ... Own vehicle position detector 20 ... Change notification part 30 ... Change command part 40 ... Reception level stabilization Chemical department

Claims (16)

[Claims] 1. A tuner (2) for tuning and selecting a required channel from FM multiplex broadcasting, a speaker (5) for reproducing an audio signal separated from a selected broadcast wave signal, and a selected broadcast wave signal. FM demodulator for demodulation (6) for demodulation, decoder for demodulation (7) for restoring the demodulated signal to the original data signal, and a database for the position, frequency, output and transmission height of the broadcasting station When the reception level from the database unit (10), the vehicle position detector (12) that detects the vehicle position, and the tuner (5) is low, a broadcast station that broadcasts the same content transmits to the vehicle position. An arithmetic unit (8) for calculating the electric field strength and causing the tuner (2) to select the broadcasting station with the highest electric field intensity, and a memory (9) used for storing data when the arithmetic unit (8) calculates. , The above restoration It has been display for displaying data (11) and the FM multiplex broadcast receiver, characterized in that it comprises a. 2. A GP as the vehicle position detector (12)
F according to claim 1, characterized in that S is used.
M multiplex broadcast receiver. 3. The arithmetic unit (8) obtains a moving direction of the own vehicle from the automatic position detector (12), predicts a broadcasting station to be selected next from the moving direction of the own vehicle, and receives the receiving station. The FM multiplex broadcast receiver according to claim 1, wherein the field intensity is calculated when changing and the channel can be selected without searching for another station. 4. A moving direction detector (13) for detecting a moving direction of the vehicle is further provided, and the arithmetic unit (8) selects next from the moving direction of the own vehicle by the moving direction detector (13). The FM multiplex broadcast receiver according to claim 1, wherein the broadcasting station to be tuned in is predicted, and the electric field strength is calculated when the receiving station is changed so that the station can be selected without searching for another station. 5. The arithmetic unit (8) is further provided with a change notifying section (20) for notifying that the broadcast station has been changed, and the change notifying section (20) outputs a synthesized sound for changing the broadcast station. The FM multiplex according to claim 1, further comprising a voice synthesizing unit (21) for amplifying the synthesized voice signal, an amplifier (22) for amplifying the synthesized voice signal, and a speaker (22) for reproducing the amplified synthesized signal. Broadcast receiver. 6. The arithmetic unit (8) is further provided with a change notifying section (20) for notifying that the broadcast station has been received and changed, and the change notifying section (20) outputs a synthesized sound for changing the broadcast station. A voice synthesizing unit (21) for performing the output of the voice synthesizing unit (21) and a speaker (5) on the input side of the speaker (5).
The FM multiplex broadcast receiver according to claim 1, further comprising a switch (24) for selectively switching an audio signal to the receiver. 7. The arithmetic unit (8) is further provided with a change notification unit (20) for notifying that the broadcast station has been changed, and the change notification unit (20) is provided on the input side of the speaker (5). The switch (2) that selectively switches the beep sound signal from the arithmetic unit (8) and the audio signal to the speaker (5).
4) and F are provided, F of Claim 1 characterized by the above-mentioned.
M multiplex broadcast receiver. 8. The arithmetic unit (8) is further provided with a change notification unit (20) having a lighting device (27) for notifying that the broadcast station has been changed. The described FM multiplex broadcast receiver. 9. The arithmetic unit (8) is further provided with a change command section (30) for changing the reception of the broadcast station, and the change command section (30) is for changing the broadcast station change command. The FM multiplex broadcast receiver according to claim 1, comprising a voice recognition unit (31) for performing voice recognition, and a microphone (32) connected to the voice recognition unit (31). 10. The arithmetic unit (8) is further provided with a reception level stabilizing unit (40), and the reception level stabilizing unit (30) smoothes or samples and holds the reception level. The FM multiplex broadcast receiver according to claim 1. 11. The computing device (8) uses at least 3 instead of the vehicle information from the vehicle position detector (12).
The reception level from each broadcasting station is acquired, and the information on the position, frequency, output, and transmission height of the broadcasting station stored in the database unit (10) is used to calculate each broadcasting station and own vehicle from the formula of the electric field strength. Find the distance to the position, draw a circle around this broadcasting station at this distance, and set the vehicle center at the center where each circle intersects, and set the electric field strength from the broadcasting station broadcasting the same content to the vehicle position. The FM multiplex broadcast receiver according to claim 1, characterized in that the tuner (2) selects the broadcast station having the strongest electric field strength calculated. 12. The tuner (2) is made into two tuners (2-1, 2-2), one of which is for searching a broadcasting station,
The FM multiplex broadcast receiver according to claim 1, wherein the other is for reception. 13. Among the two points where the two circles intersect, the minimum line segment of the line segments between these points and the point that intersects with another circle is determined, and the minimum line segment is placed at both ends. The point included is assumed to be close to the own vehicle position, two other points close to the own vehicle position are obtained in this way, and the coordinates of the center of gravity of a triangle formed by these three points are set as the own vehicle position. F described in
M multiplex broadcast receiver. 14. The FM multiplex broadcast receiver according to claim 11, wherein a triangle is formed from the points where the circles intersect, the area of the triangle is determined, and the center of gravity of the triangle with the smallest area is the vehicle position. 15. The display unit (11) stores road information having a road map in the database unit (10).
The FM multiplex broadcast receiver according to claim 1, characterized in that the VICS traffic information is superimposed on the road map for pictorial display or text display. 16. The memory (9) according to claim 1, characterized in that the VICS traffic information is divided into areas centered on a vehicle position based on area information included in the VICS traffic information. FM multiplex broadcast receiver.