JP3712543B2 - DGPS FM multiplex broadcast receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a DGPS-compatible FM multiplex broadcast receiver in a vehicle-mounted device.
[0002]
[Prior art]
In recent years, navigation systems and other vehicle navigation systems have made remarkable progress. As one of them, navigation apparatuses using GPS (Global Positioning System) are known, and further, DGPS (DGPS ( Differential Global Positioning System) has become popular. This is because the GPS satellite signal is received by the antenna whose installation position is accurately measured, the GPS time is obtained for each satellite, the difference between this measurement result and the GPS time determined separately is obtained, and the GPS time difference for each satellite is obtained. Information is transmitted by FM multiplex broadcasting, and the vehicle navigation apparatus corrects the time by the difference for each satellite received from the FM multiplex broadcasting, and corrects the current position using the correction result. If DGPS is used, it is possible to obtain a positioning accuracy of about 10 times compared to the positioning accuracy in the case of only general GPS information. As an apparatus for receiving this type of FM multiplex broadcasting, an apparatus described in Japanese Patent Application Laid-Open No. 8-191233 is known.
[0003]
On the other hand, a road traffic information communication system called VICS (Vehicle Information and Communication System) is being used to alleviate traffic jams, etc., and road traffic information multiplexed with existing FM broadcast signals is installed in vehicles. By receiving the information and displaying it on the display unit, it is possible to provide the driver with road traffic information such as traffic jam information and traffic regulation information.
[0004]
FIG. 4 shows the configuration of a conventional receiving apparatus capable of receiving a plurality of FM multiplex broadcasts. In FIG. 4, 1a and 1b are FM multiplex broadcast receiving antennas, 2a and 2b are FM tuners, and 3a and 3b are decoders that obtain FM multiplex information from FM multiplex broadcasts received by the respective tuners 2a and 2b. It is. A data processing unit 4 processes the received FM multiplex information and sends data to the navigation device 5 and the display unit 6.
[0005]
The operation of the DGPS-compatible FM multiplex broadcast receiving apparatus configured as described above will be described below. First, the data processing unit 4 sends channel selection data to the FM tuner 2a, and the tuner 2a selects a broadcasting station that broadcasts the DGPS FM multiplexed signal. The FM multiplex decoder 3 a decodes FM multiplex information from the currently selected FM signal and sends it to the data processing unit 4. When receiving FM multiplex broadcasts other than DGPS FM multiplex signals, for example, VICS information, the data processing unit 4 controls the tuner 2b to select the VICS FM multiplex broadcast. The received signal is decoded by the FM multiplex decoder 3 b and sent to the data processing unit 4. The data processing unit 4 processes and sends data in a form suitable for the navigation device 5 and the display unit 6. The navigation device 5 calculates the current position with high accuracy based on the received DGPS information, and obtains traffic congestion information and traffic regulation information on the destination based on the received VICS information.
[0006]
[Problems to be solved by the invention]
However, the above-described conventional configuration requires two tuners and FM multiplex decoders for DGPS FM multiplex signals and other FM multiplex signals, which increases the size and cost of the apparatus. there were. In addition, DGPS can determine the current position with high positioning accuracy. However, when driving on an expressway or on a road, DGPS FM multiplexing for DGPS is less likely to deviate greatly from the map due to techniques such as map matching. In spite of the fact that positioning by signals does not have to be performed frequently, the tuner, FM multiplex decoder, data processing unit, etc. always perform the DGPS FM multiplex signal reception operation regardless of the driving state, and unnecessary power is required. There was a problem that was consumed.
[0007]
An object of the present invention is to solve such a conventional problem, and to provide an excellent DGPS-compatible FM multiplex broadcast receiving apparatus that is small in size, low in cost and low in power consumption.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a broadcast station that receives FM multiplex broadcasts (hereinafter referred to as DGPS FM multiplex broadcasts) for broadcasting DGPS FM multiplex signals by one tuner and other FM multiplex broadcasts. When receiving while switching and traveling at a certain speed or higher on highways or roads, it is determined that the reception priority of the DGPS FM multiplex broadcast is low, and the reception time of the DGPS FM multiplex broadcast is shortened . Increase the reception time of FM multiplex broadcast reception . In addition, when the vehicle speed is lower than a certain speed in an urban area or the like, it is determined that the reception priority of the DGPS FM multiplex broadcast is high, and the vehicle speed is longer than the reception time of the DGPS FM multiplex broadcast , By shortening the reception time of FM multiplex broadcast reception other than that, the current position measurement accuracy is improved and matching of roads and the like is prevented from being erroneous.
[0009]
Therefore, according to the present invention, since only one tuner and one FM multiplex decoder are required, the apparatus can be downsized and the cost can be reduced. Further, when the vehicle speed is equal to or higher than a certain speed, the frequency of reception of the DGPS FM multiplex broadcast is reduced, so that power saving can be achieved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention, a tuner means for receiving the F M radio, a decoding means for obtaining an FM multiplex information from the FM radio waves received, and the reception frequency changing means for changing the frequency of the radio wave to be received, Timer means for measuring time, vehicle speed detecting means for detecting vehicle speed, means for changing the reception time of FM multiplex broadcast for broadcasting DGPS FM multiplex signals and other FM multiplex broadcasts according to the vehicle speed wherein the reception frequency changing means, when the vehicle speed is above a certain rate, exchange received each other by lengthening the reception time of the other FM multiplex broadcast than the reception time of the DGPS for FM multiplex broadcast, the vehicle speed is less than a certain speed cases, FM multiplex broadcast receiving time for DGPS, the vehicle speed is greater than the reception time of the FM multiplex broadcasting DGPS above a certain speed, the reception time of the other FM multiplex broadcasting, before The vehicle speed is the DGPS corresponding FM multiplex broadcast receiving apparatus characterized by receiving alternately shorter than the reception time of the other FM multiplex broadcasting above a certain speed, two or more in a single tuner means and decoding means The FM multiplex broadcast is received while switching, so that the size and cost of the apparatus can be reduced, and if the vehicle is traveling on a highway or general road at a certain speed or higher, it is currently running Therefore, it is possible to save power by lowering the reception priority of FM multiplex broadcasting for DGPS.
[0011]
The invention according to claim 2 of the present invention, a tuner means for receiving the F M radio, and FM multiplex decoder means for obtaining the DGPS information from the FM radio waves received, and VICS decoding means for obtaining VICS information from the received radio wave, Receiving frequency changing means for changing the frequency of radio waves to be received, timer means for measuring time, vehicle speed detecting means for detecting vehicle speed, FM multiplex broadcasting for broadcasting DGPS FM multiplex signals, and reception of VICS information and means for changing in accordance with time to the vehicle speed, the reception frequency changing means, when the vehicle speed is more than a certain speed, by increasing the reception time of the FM multiplex broadcasting VICS than the reception time of the DGPS for FM multiplex broadcast Transportation received each other, if less than the predetermined vehicle speed rate, FM multiplex broadcast receiving time for DGPS, the vehicle speed is FM multiplex broadcasting DGPS above a certain speed Longer than the signal time, the reception time of the FM multiplex broadcasting VICS, DGPS corresponding FM multiplex, characterized in that receiving alternately the vehicle speed is shorter than the reception time of constant speed or more FM multiplex broadcasting VICS This is a broadcast receiving device that can receive DGPS information and VICS information with a single tuner means, so that the size and cost of the device can be reduced, and highways and ordinary roads can be used at a certain speed or higher. When the vehicle is traveling, there is little possibility that the vehicle will be deviated from the currently traveling road. Therefore, by lowering the reception priority of the DGPS FM multiplex broadcast, power saving can be achieved.
[0013]
The invention described in claim 3 of the present invention, the vehicle speed detecting means is a DGPS corresponding FM multiplex broadcast receiving apparatus according to claim 1 or 2 Symbol mounting, characterized in that a vehicle speed detecting means of the navigation device, a vehicle speed sensor By using the navigation device, it is not necessary to provide a vehicle speed sensor in the FM multiplex broadcast receiver.
[0014]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 shows a schematic configuration of a DGPS-compatible FM multiplex broadcast receiving apparatus according to a first embodiment of the present invention. In FIG. 1, 11 is an FM multiplexing antenna, and 12 is a tuner for selecting FM multiplexed broadcasting. Reference numeral 13 denotes an FM multiplex decoder that extracts an FM multiplex signal from FM signals received by the tuner 12, and reference numeral 14 changes the reception frequency in the tuner 12, processes the decoded FM multiplex signal, and receives FM multiplex broadcast for DGPS. It is a data processing unit that controls priority. 15 is a navigation device, 16 is a display unit for displaying a map and FM multiplexed information, 17 is a vehicle speed sensor for detecting the vehicle speed, and 18 is a timer for measuring time.
[0015]
Next, the operation of the DGPS-compatible FM multiplex broadcast receiving apparatus configured as described above will be described. For example, when a vehicle is traveling at a speed of less than 60 km / h, there are many roads parallel to intersections and roads currently running in urban areas, and the error range is large in positioning accuracy by GPS. There is a possibility that. For this reason, there is a high demand for positioning accuracy of the current position and it is necessary to increase the reception priority of FM multiplex broadcasting for DGPS so that an intersection or road is not mistaken or a destination such as a parking lot is not passed. is there. In such a case, the data processing unit 14 determines that the reception priority of the DGPS FM multiplex broadcast is high based on the speed data from the vehicle speed sensor 17, and based on the time data based on the timer 18, for example, The tuner 12 is controlled by setting the reception time length or time interval so that the time for receiving the DGPS FM multiplex broadcast is 5 minutes and the time for receiving the other FM multiplex broadcasts is 5 minutes. The tuner 12 receives the FM broadcast of the frequency set by the data processing unit 14, and the FM decoder 13 decodes the FM multiplex signal of the DGPS FM multiplex broadcast and other FM multiplex broadcasts at the above time interval. The data processing unit 14 processes FM multiplex information obtained from the DGPS FM multiplex broadcast and other FM multiplex broadcasts into a format suitable for the navigation device 15 and the display unit 16 and sends the processed information. The navigation device 15 calculates a current position with high positioning accuracy based on the received data and displays it on the display unit 16.
[0016]
On the other hand, when the data processing unit 14 determines that the vehicle speed is equal to or higher than a certain speed, for example, when driving along a highway or a general road at 60 Km / h or higher, the direction suddenly differs from the current road. Therefore, it is not necessary to frequently receive DGPS FM multiplex broadcasting. For this reason, if the current position with high positioning accuracy is calculated, the data processing unit 14 has a priority for receiving the FM multiplex broadcast for DGPS because it is unlikely that the current running road is deviated by a technique such as map matching. The tuner 12 is determined to be low, and the tuner 12 is controlled so as to receive a DGPS FM multiplex broadcast for 3 minutes, for example, and receive other FM multiplex broadcasts for 12 minutes. The tuner 12 receives a broadcast having a designated frequency. The FM multiplex decoder 13 decodes the FM multiplex signal received at the time interval and inputs it to the data processing unit 14. The data processing unit 14 performs data processing of the DGPS FM multiplexed signal for 3 minutes in the 15 minutes of the above time interval, and performs data processing of the other FM multiplexed signals for the remaining 12 minutes.
[0017]
As described above, according to the first embodiment, two or more types of FM multiplex broadcasts are received while being switched by one tuner and one FM multiplex decoder, so that the size and cost of the apparatus can be reduced. Also, if you are traveling on a highway or ordinary road at a certain speed or higher, there is little possibility of escaping from the road you are currently traveling on, so lower the reception priority of FM multiplex broadcasting for DGPS. Therefore, power saving can be achieved.
[0018]
In the first embodiment, the constant speed for determining the reception priority of FM multiplex broadcasting for DGPS is set to 60 Km / h. However, other speeds may be used. Further, the vehicle speed determination criterion is not limited to one and may be set in a plurality of stages. Furthermore, the time length and time interval for receiving the DGPS FM multiplex broadcast and other FM multiplex broadcasts may be set more finely.
[0019]
(Embodiment 2)
FIG. 2 shows a schematic configuration of the DGPS-compatible FM multiplex broadcast receiving apparatus according to the second embodiment of the present invention. The first embodiment shown in FIG. 1 is different from the first embodiment only in that a VICS decoder 19 is added. Since they are different, the same components are denoted by the same reference numerals, and redundant description is omitted.
[0020]
When the received FM multiplex broadcast is an FM multiplex broadcast that broadcasts a VICS multiplex signal, the VICS decoder 19 performs descrambling of the VICS FM multiplex signal. With this configuration, the tuner 12 and the FM multiplex decoder 13 can receive the DGPS FM multiplex broadcast, and the tuner 12 and the VICS decoder 13 can receive the VICS information. Therefore, the data processing unit 14 receives the DGPS FM multiplex broadcast and the VICS FM multiplex broadcast while switching with the tuner 12 and controls the reception priority of the DGPS FM multiplex broadcast according to the vehicle speed.
[0021]
That is, when the vehicle speed is equal to or less than a certain speed, as in the first embodiment, for example, when the vehicle speed is less than 60 km / h, it is determined that the reception priority of the DGPS FM multiplex broadcast is high, and the DGPS FM multiplex is used. The broadcast is received for 5 minutes, and the VICS FM multiplex broadcast is received for the next 5 minutes. Further, when the vehicle speed is equal to or higher than a certain speed, as in the first embodiment, for example, when the vehicle speed is equal to or higher than 60 km / h, it is determined that the reception priority of the DGPS FM multiplex broadcasting is low, and the DGPS for 3 minutes After receiving the FM multiplex broadcast, the VICS FM multiplex broadcast is received for 12 minutes.
[0022]
As described above, according to the second embodiment, one tuner, one FM multiplex decoder, and one VICS multiplex decoder receive two types of FM multiplex broadcasts: DGPS FM multiplex broadcast and VICS FM multiplex broadcast. It is possible to reduce the size and cost of the device, and if you are driving along a highway or general road at a certain speed or higher, you can get off the road you are currently driving. Therefore, power saving can be achieved by lowering the reception priority of DGPS FM multiplex broadcasting.
[0023]
(Embodiment 3)
FIG. 3 shows a schematic configuration of a DGPS-compatible FM multiplex broadcast receiving apparatus according to the third embodiment of the present invention. In the first embodiment shown in FIG. 1, a vehicle speed sensor 17 is provided for the receiving apparatus. Since the only difference is that the vehicle speed sensor incorporated in the navigation device 5 is used, the same components are denoted by the same reference numerals, and redundant description is omitted.
[0024]
Normally, in addition to calculating the current position by GPS, the navigation device detects a vehicle speed sensor and a driving direction so as to calculate the current position so that the current position can be calculated even in tunnels or valleys of buildings where GPS cannot be used. It has a gyroscope. In the present embodiment, vehicle speed information from a vehicle speed sensor provided in the navigation device 15 is input to the data processing unit 14 and the reception priority is determined in the same manner as in the first embodiment. is there. Thereby, it is not necessary to have a vehicle speed sensor as an FM multiplex receiver, and a simpler configuration can be achieved.
[0025]
As is clear from the above embodiment, the present invention receives FM multiplex broadcasting for broadcasting DGPS FM multiplex signals by one tuner and other FM multiplex broadcasts while switching receiving broadcast stations, When traveling at a certain speed or higher due to roads, etc., it is determined that the reception priority of the DGPS FM multiplex broadcast is low, the reception time of the DGPS FM multiplex broadcast is shortened, and other FM multiplex broadcast reception intervals are set. Since the length is increased , the apparatus becomes smaller and the cost is reduced, and the frequency of reception of the DGPS FM multiplex broadcast is reduced according to the vehicle speed, so that power saving can be achieved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a DGPS-compatible FM multiplex broadcast receiving apparatus according to Embodiment 1 of the present invention. FIG. 2 shows a schematic configuration of a DGPS-compatible FM multiplex broadcast receiving apparatus according to Embodiment 2 of the present invention. FIG. 3 is a block diagram showing a schematic configuration of a DGPS-compatible FM multiplex broadcast receiving apparatus according to Embodiment 3 of the present invention. FIG. 4 is a block diagram showing a schematic configuration of a DGPS-compatible FM multiplex broadcast receiving apparatus in a conventional example. Explanation of symbols]
11 Antenna 12 Tuner 13 FM Multiplex Decoder 14 Data Processing Unit 15 Navigation Device 16 Display Unit 17 Vehicle Speed Sensor 18 Timer 19 VICS Decoder

Claims (3)

A tuner means for receiving the F M radio, a decoding means for obtaining an FM multiplex information from the FM radio waves received, and the reception frequency changing means for changing the frequency of the radio wave to be received, a timer means for measuring time, detecting a vehicle speed Vehicle speed detection means, and FM multiplex broadcast broadcasting the DGPS FM multiplex signal and means for changing the reception time of other FM multiplex broadcast according to the vehicle speed,
The reception frequency changing means, when the vehicle speed is above a certain rate, exchange received each other by lengthening the reception time of the other FM multiplex broadcast than the reception time of the DGPS for FM multiplex broadcast, when the vehicle speed is less than the predetermined speed The reception time of FM multiplex broadcasting for DGPS is longer than the reception time of FM multiplex broadcasting for DGPS when the vehicle speed is equal to or higher than a certain speed , and the reception time of other FM multiplex broadcasting is other than that when the vehicle speed is equal to or higher than a certain speed. A DGPS-compatible FM multiplex broadcast receiving apparatus characterized in that the reception is alternately made shorter than the reception time of FM multiplex broadcast. A tuner means for receiving the F M radio, and FM multiplex decoder means for obtaining the DGPS information from the FM radio waves received, and VICS decoding means for obtaining VICS information from the radio waves received, the reception frequency changing means for changing the frequency of the radio wave to be received Timer means for measuring time, vehicle speed detecting means for detecting vehicle speed, FM multiplex broadcasting for broadcasting the DGPS FM multiplex signal, and means for changing the reception time of the VICS information according to the vehicle speed. ,
The reception frequency changing means, when the vehicle speed is above a certain rate, exchange received each other by lengthening the reception time of the VICS FM multiplex broadcast than the reception time of the DGPS for FM multiplex broadcast, when the vehicle speed is less than the predetermined speed The reception time of the DGPS FM multiplex broadcast is longer than the reception time of the DGPS FM multiplex broadcast with the vehicle speed equal to or higher than the constant speed, and the reception time of the VICS FM multiplex broadcast is for the VICS with the vehicle speed equal to or higher than the constant speed. A DGPS-compatible FM multiplex broadcast receiving apparatus characterized in that the reception is alternately made shorter than the reception time of FM multiplex broadcast. Vehicle speed detecting means, DGPS corresponding FM multiplex broadcast receiving apparatus according to claim 1 or 2 Symbol mounting, characterized in that a vehicle speed detecting means of the navigation device.

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