JPH04326627A - Geography correspondence radio receiver - Google Patents

Abstract

PURPOSE:To set an optimum reception sensitivity in response to the geographical position of a vehicle. CONSTITUTION:Position information 100 fed from a navigation system 12 is inputted to a receiver controller 22 and a receiver controller 22 refers to a geography/gain table 24 to adjust an AGC level and a search level in a search function in response to the position of a vehicle. Thus, 90 optimum reception signal is processed at each district.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a radio receiving device (radio receiver) mounted on a moving vehicle.

0002

2. Description of the Related Art Conventionally, vehicles are usually equipped with radio receivers. Through this radio receiver, the driver can enjoy music from general broadcast stations or obtain useful information such as traffic information. Although FM receivers and AM receivers are known as such radio receivers, radio receivers capable of receiving both of these receivers are also widely used.

By the way, such radio reception is influenced by the area and terrain in which the vehicle is traveling. That is, in general, in areas far away from the broadcasting station, in mountainous areas, etc., the received signal is weak, so it is necessary to increase the reception sensitivity. Furthermore, since the strength of the received signal changes even while the vehicle is running, it is necessary to adjust the reception sensitivity.

[0004] Therefore, in the past, so-called AGC
A circuit (auto gain control circuit) is provided, and the AGC circuit adjusts reception sensitivity based on the RF signal or IF signal after high frequency amplification. Specifically, the reception sensitivity is adjusted by varying the degree of high frequency amplification in the high frequency amplifier circuit and the degree of attenuation of the received signal in the antenna circuit.

[0005]

[Problems to be Solved by the Invention] However, in the conventional radio receiver described above, since the operation of the AGC circuit is uniquely set, it is impossible to set the receiving sensitivity appropriately depending on the geographical environment. There was a problem. To give an example, within Japan, there are 162
Traffic information is broadcast at 0KHz, but if you want to receive such traffic information in a specific area, for example, an area near a FEN broadcast station that is broadcast at 810KHz,
There is a problem in that the above-mentioned high frequency amplification degree and received signal attenuation degree are not set appropriately, and interference occurs in traffic information due to harmonics when receiving FEN broadcasting stations. In other words, when receiving a relatively weak received signal for traffic information, it is necessary to exclude the received signal from the FEN broadcasting station, which has a relatively high output, but as mentioned above, the reception sensitivity setting (high frequency Setting the input level of the FET that performs amplification, etc.)
This was not carried out properly, resulting in interference.

Furthermore, some conventional radio receivers have a function of scanning reception frequencies within a certain reception frequency range and searching for broadcast stations having received signals above a certain level. When trying to execute such a function, in the past, the level was fixed to 1 or 2, so it was not possible to execute the appropriate search function depending on the area where the vehicle was traveling. . Therefore, there has been a need for a radio receiver that can effectively operate various functions depending on reception conditions. The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to appropriately set the receiving sensitivity of a radio receiving device and execute various functions according to the geographical location of a moving vehicle. An object of the present invention is to provide a geographically compatible radio receiving device that can perform the following tasks.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a radio receiver mounted on a moving object according to claim 1, and a radio receiver that measures the geographical position of the moving object. The radio receiver is characterized in that it includes a position information output device that outputs position information, and a receiver controller that controls functions of the radio receiver according to the position information.

[0008] Furthermore, the invention according to claim 2 is characterized in that the receiver controller varies the receiving sensitivity of the radio receiver in accordance with the geographical information.

Furthermore, the invention according to claim 3 is characterized in that the radio receiver scans reception frequencies within a predetermined frequency range and detects broadcast stations having a reception signal level equal to or higher than a predetermined station detection level. The receiver controller includes a search circuit, and is characterized in that the receiver controller varies the station detection level according to the position information.

[0010]Furthermore, the invention as set forth in claim 4 is characterized in that the reception band is switched by the receiver controller. Accordingly, the reception band is switched according to location information and time information.

[0011]

[Operation] According to the structure of claim 1, since the position information output device and the receiver controller are provided, the radio It becomes possible to control each function of the receiver.

That is, as shown in the configuration of claim 2, it becomes possible to adjust the reception sensitivity setting according to the geographical position of the mobile object. Therefore, it becomes possible to appropriately process the received signal while automatically preventing the above-mentioned interference and the like.

Furthermore, according to the configuration of claim 3, in the function of searching for broadcast stations by scanning, the station detection level related to the search can be varied according to the position of the mobile object, so that, for example, within Japan, The above search function can be executed appropriately. In other words, if the mobile object is located far from the broadcast station, the search level may be set relatively low, and if the mobile object is located near the broadcast station, the station detection level may be set relatively high. becomes possible.

[0014] Furthermore, according to the invention as claimed in claim 4 and the invention as claimed in claim 5, the receiving band can be switched according to the geographical information or according to the geographical information and time information, so that interference can be avoided, for example. If you are driving in an area where this is likely to occur,
Alternatively, when the vehicle is traveling at a time when interference is likely to occur (for example, at night), it is possible to switch the reception band and ensure appropriate radio reception according to the situation.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall configuration of a geographically compatible radio receiving apparatus according to the present invention. In this embodiment, the radio receiving device is mounted on a vehicle and is broadly divided into a radio receiving system 10 and a navigation system 12 as a device that outputs vehicle position information. . First, this navigation system 12 will be explained.

In this embodiment, the navigation system 12 uses a so-called GPS (Global Positioning System) to determine the heading direction and geographical position of the vehicle, and provides various services based on this information. Specifically, an antenna (not shown) and
The illustrated microcomputer 14 and a CD ROM 16 that provides various information to the microcomputer 14
and a display 18 on which various displays are performed. The CD ROM 16 stores maps and various geographical service information, and when the microcomputer 14 determines the position and direction of the vehicle according to the signal received from the antenna, it refers to the contents of the CD ROM 16 and displays it. The vehicle's geographical position, traveling direction, etc. are displayed on the display 18. Note that, in addition to the above-mentioned GPS, it is also suitable to apply to this navigation system 12 a system that detects direction using earth's magnetism, RACS (Road-to-Vehicle Information System), or the like.

Position information 100 indicating the geographical position of the vehicle determined by the microcomputer 14 is supplied to the radio reception system 10. This radio receiving system 10 includes a radio receiver 20, and this radio receiver 2.
a receiver controller 22 that controls the
It is composed of a geography/gain table 24.

FIG. 2 shows a specific configuration of the radio receiver 20. A received signal received by the antenna 26 is input to an antenna circuit 28. This antenna circuit 28 performs matching with the antenna and attenuation of the received signal. The output of antenna circuit 28 is sent to RF circuit 30. This RF circuit 30
performs high frequency amplification and tuning. And R
The output of the F circuit 30 is the signal from the oscillator 33 and the mixer 3.
5 and converted to an intermediate frequency. Then, the signal converted to the intermediate frequency is amplified by the IF circuit 37, and further detected by the detection circuit 38, and after the output is amplified, it is sent to the speaker 40.

On the other hand, the RF circuit 30 includes a tuning control circuit 3.
2 are connected. This tuning control circuit 32 receives the output of a tuning device 34 composed of a tuning dial, a tuning key, etc., and controls tuning and the like in the RF circuit 30. This channel selection control circuit 32 is shown in FIG.
Tuning information (tuning frequency information) 102 is output to the receiver controller 22 shown in FIG. In this embodiment, the channel selection control circuit 32 has a search function that scans the reception frequency within a predetermined frequency range and detects a broadcasting station having a reception signal level equal to or higher than a predetermined station detection level (search level). have. That is, by turning on a predetermined switch provided in the channel selector 34, this search function is executed, and a broadcast station existing within the frequency range is searched. In executing the search function, the search level to be compared with the received signal is set in the channel selection control circuit 32 according to the search level information 104 sent from the receiver controller 22.

In FIG. 2, the radio receiver 2 of this embodiment
0, an AGC circuit 36 is provided. The AGC circuit 36 controls the operation of the RF circuit 30 and the antenna circuit 28 by detecting the level of the signal after high frequency amplification or by detecting the level of the IF signal. Specifically, it adjusts the high frequency amplification degree and the attenuation degree of the received signal. In this embodiment, the AGC circuit 36 is supplied with AGC level information 106 from the receiver controller 22 shown in FIG.
The GC circuit 36 controls the antenna circuit 28 and the RF circuit 30 according to the AGC level information 106.

Returning to FIG. 1, the geography/gain table 24
is the geographical location of the vehicle and the AGC corresponding to that location.
This table shows the relationship between level, search level, etc.

The receiver controller 22 controls each function of the radio receiver 20, ie, the above-mentioned AGC and search function. Specifically, the receiver controller 22 inputs the position information 100 supplied from the navigation system 12, refers to the geography/gain table 24, and thereby sets the geographically appropriate AGC level and search level. It is something. Each set level is output to the radio receiver 20 as AGC level information 106 and search level information 104. Note that, as described above, this receiver controller 22 is supplied with tuning information from the tuning control circuit 32, and the receiver controller 22 uses this tuning information 102 to determine the current reception in the radio receiver 20. The frequency is specified, and the AGC level and search level are set based on this as well.

[0024] Therefore, when receiving radio information,
Since the receiver controller 22 constantly controls the AGC level according to the geographical location of the vehicle, it is possible to always perform optimal processing of received signals. For example, as mentioned above, F
Conventionally, when a vehicle is driving in a neighborhood of an EN broadcast station (this neighborhood is defined by the geography/gain table 24) and receives traffic information transmitted at 1620 KHz, the Interference was likely to occur due to the effects of harmonics caused by excessive input distortion of the FET, but according to this embodiment, the sensitivity of the AGC circuit 36 is increased by control of the receiver controller 22, and the degree of attenuation of the antenna circuit 28 is reduced. Increase the input level of the RF circuit (
By lowering the input level of the FET, it is possible to prevent interference while optimally processing the received signal.

[0025] That is, for example, by storing the optimum reception sensitivity settings in the table 24 in consideration of the reception conditions throughout Japan, it becomes possible to always listen to clear reception sound with appropriate reception sensitivity. .

[0026] Similarly, when executing the above-mentioned search function, the search level can be varied depending on the position of the vehicle. Search level settings are realized. Specifically, the received signal strength is greatly affected by the distance from the broadcast station, but if the vehicle is located in an area far from the broadcast station, the search level is lowered and scanning for the broadcast station is performed, and vice versa. In this case, it is possible to increase the search level and perform scanning. Therefore, it is possible to provide a highly convenient radio receiving device.

[0027] It is also preferable to adjust and control each function of the radio receiver other than those described above in accordance with the geographical location of the vehicle, thereby providing even greater convenience.

For example, as an RF filter or an IF filter that determines the reception band of a radio receiver, two types of wide and narrow filters are used.
Depending on the geographical location, narrowband filters are used to narrow the reception band in areas where interference is likely to occur, and high-bandwidth filters are used to narrow the reception band in areas where interference does not occur. By widening the range, better reception can be achieved.

Furthermore, by connecting a clock circuit to the receiver controller 46 and generating time information from the clock circuit, the reception band can be narrowed when reception is performed in a particular region at a particular time. For example, in certain areas such as areas adjacent to foreign countries, interference with foreign broadcasting stations is likely to occur at night, but if you switch the reception band using local information and time information, you can receive good reception. Can be done.

[0030]

[Effects of the Invention] As explained above, according to the present invention,
Depending on the geographical location of the mobile object, you can set the reception sensitivity, adjust the search level when executing the search function, or switch the reception band, so it is always optimal regardless of the geographical location. It becomes possible to realize the processing of received signals. Therefore, it is possible to provide a convenient radio receiving device with high fidelity.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of a geographically compatible radio receiving device according to the present invention.

FIG. 2 is a block diagram showing the configuration of a radio receiver.

[Explanation of symbols]

10 Radio reception system 12 Navigation system 14 Microcomputer 20 Radio receiver 22 Receiver controller 24 Geography/gain table

Claims (5)

[Claims] 1. A radio receiver mounted on a mobile body; a position information output device for measuring the geographical position of the mobile body and outputting the position information; and a position information output device for measuring the geographical position of the mobile body and outputting position information; A geo-enabled radio receiving device comprising: a receiver controller for controlling functions. 2. The geographically responsive radio receiving apparatus according to claim 1, wherein the receiver controller varies the receiving sensitivity of the radio receiver according to the geographical information. 3. The geographically responsive radio receiving device according to claim 1, wherein the radio receiver scans a reception frequency within a predetermined frequency range, and has a reception signal level equal to or higher than a predetermined station detection level. What is claimed is: 1. A geographically compatible radio receiving device, comprising a search circuit for detecting a broadcasting station, wherein the receiver controller varies the station detection level according to the location information. 4. The geographically responsive radio receiving apparatus according to claim 1, wherein the receiver controller switches the receiving band of the radio receiver according to the geographical information. . 5. The geographically responsive radio receiving device according to claim 1, further comprising a time information output device that outputs time information, and said receiver controller transmits information to said radio receiver according to said location information and said time information. What is claimed is: 1. A geographically compatible radio receiving device, characterized in that it switches reception bands.