JPH0620182B2 - Mobile radio wave receiver - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mobile broadcast radio wave receiving apparatus such as a car radio.

2. Description of the Related Art Generally, in a mobile broadcast radio wave receiving device such as a car radio, the electric field strength of the broadcast radio wave may become stronger or weaker depending on the moving area. At the moment, the listener feels it and knows the limit of the reception state, and the tuning operation is performed to find out whether there is another broadcast that can be heard in the non-guide area.

In the past, however, a receivable broadcasting station was searched by detecting a radio wave having a certain electric field strength or more in a certain area according to a key operation, and the frequency of the received radio wave having a certain electric field strength or more was searched. It has been developed to automatically tune in sync with.

However, if such a measure is taken, all radio waves having a certain reception electric field strength or more will be detected and tuned even if they are not broadcast, so noise may be received or at night. We have also received broadcast radio waves that are not particularly necessary, such as foreign broadcasts, where the received electric field strength of broadcast radio waves is strong.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a mobile broadcasting radio wave receiving apparatus capable of reliably and automatically selecting a predetermined broadcasting station in a moving area.

Configuration In order to achieve the object, the present invention registers data of receivable broadcasting stations in each area in a storage device in advance, and determines the position of a vehicle on a two-dimensional coordinate corresponding to a plurality of currently moving areas. Obtained, determine the area where the vehicle is currently moving from that position and calculate the predetermined area data,
By checking whether the received electric field strength of the broadcast radio wave at the broadcasting station according to the read data by addressing the storage device according to the regional data that is output is actually above a certain level to withstand audibility, In addition to making it automatically tune with the set priority,
Broadcasting stations other than the registered ones can be received as long as they have an electric field strength higher than the audible level.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In the mobile broadcast wave receiving device according to the present invention,
As shown in the figure, a tuner 1 having an automatic tuning function that tunes to a radio wave of a broadcasting station received by an antenna ANT.
, A region code data generator 2 for generating a predetermined coded data by extracting a moving region, and data of receivable broadcasting stations in each region are stored in advance as a broadcasting station list. A broadcast station list ROM 3 from which data of a predetermined broadcast station is read by using the generated regional code data from 2 as an address, an amplifier 4 for outputting the broadcast of the broadcast station selected by the tuner 1 from a speaker SP, ROM 3 for broadcasting station list
A display ECU 6 (a character generator necessary for displaying a broadcasting station name, broadcasting frequency, etc.) for displaying information on the broadcasting station currently being received on a display device 5 such as a CRT according to the broadcasting station data read from Is included)
An automatic tuning switch 7 that outputs an operation command for automatic tuning by a switch operation, and an electric field strength detector 8 that detects whether or not the electric field strength of the received broadcast radio wave is above a certain level that is audible. The broadcasting ECU 9 controls the entire system according to the automatic tuning operation command to select a predetermined broadcasting station and display information.

The broadcasting station data stored in the broadcasting station list ROM 3 is data necessary for channel selection and information display, such as broadcasting audible frequency data and broadcasting station name data.
When it is not particularly necessary to display the information on the broadcasting station being received by the display device 5, only the audio frequency data of the broadcasting required for the automatic channel selection is required.

The basic operation of the thus constructed device will be described below.

As the automobile travels, the area code data generator 2 sequentially outputs the current moving area, and when the automatic channel selection switch 7 is operated in a certain moving area, the current moving area is determined according to the moving area at that time. The predetermined area code data is read by the broadcasting ECU 9. Broadcast ECU 9
Performs the addressing of the broadcasting station list ROM 3 in accordance with the read regional data code to read out the data of the receivable broadcasting station in the current region, and as will be described later, the broadcast radio wave in the read receivable broadcasting station. On the condition that the received electric field strength is above the audible level, a tuning signal is given to the tuner 1 according to the read data of the broadcasting station to select a predetermined broadcasting station. As a result, the broadcast radio wave received at the broadcast station selected by the tuner 1 is amplified by the amplifier 4 and reproduced from the speaker SP. At the same time, broadcast ECU
9 gives a display signal to the display ECU 6 in accordance with the data of the broadcasting station read from the broadcasting station list ROM 3;
Under the control of the display ECU 6, the display 5 displays the station name, frequency, etc. of the broadcast currently being received.

At this time, if a plurality of receivable broadcasting stations in the current region are registered in the broadcasting station list ROM 3, the respective broadcasting stations are given priority in advance (specifically, A flag indicating the priority is set), and the broadcasting ECU 9 selects the broadcasting station with the highest priority from the data of a plurality of broadcasting stations read simultaneously from the broadcasting station list ROM 3 according to the area code data. After that, a control means for switching the channel selection of the broadcasting stations one after another in accordance with the priority order each time the automatic channel selection switch 7 is operated. Also, every time the selection of the broadcasting station is switched according to the priority order, the information display of the broadcasting station currently being selected on the display 5 is sequentially switched.

Further, under the control of the broadcasting ECU 9, a model display of each receivable broadcasting station as shown in FIG. 2 is displayed on the display 5 according to the data of the plurality of broadcasting stations read from the broadcasting station list ROM 3. Each is performed, and one of the tuning keys K1 to K5 provided corresponding to each of the displayed broadcasting station names A to E is selectively pressed to give an instruction to the broadcasting ECU 9 to give an arbitrary instruction. You may make it take the means to select a broadcasting station by one shot. At that time, under the control of the display ECU 6, the selected broadcasting station name C among the broadcasting stations model-displayed on the display 5 and its frequency display line portion can be clearly displayed by the brightness modulation or displayed as a mark. An appropriate display means, such as "Yes", is adopted.

In such a case, in the present invention, in particular, when performing automatic tuning of receivable broadcasting stations according to the data read from the broadcasting station list ROM 3 as described above, the electric field strength detector 8 After detecting whether or not the reception electric field strength of the broadcast radio wave in the receivable broadcasting station is equal to or higher than a certain level that is audible, the reception electric field strength of the broadcast radio wave is controlled under the control of the broadcasting ECU 9 according to the detection result. The first automatic tuning means for automatically tuning a broadcasting station having a certain level or more with a preset priority is provided, and the broadcasting station list ROM3 does not exist in other broadcasting stations. However, if it is detected by the electric field strength detector 8 that the electric field strength has a certain level or more, a broadcasting station that is not registered is automatically selected. It is to take a second automatic tuning means as possible.

Specifically, after the tuner 1 temporarily selects a receivable broadcasting station according to the data read from the broadcasting station list ROM 3 under the control of the broadcasting ECU 9,
The electric field strength detector 8 detects the level of the received electric field strength of the broadcast radio wave at the broadcasting station at that time, and the broadcasting ECU 9 reads the output signal of the electric field strength detector 8 and if it is a certain level or more, At this time, the selected state of the broadcasting station is held, and when the level is lower than a certain level, another receivable broadcasting station is switched to the selected channel.

Therefore, for example, even if a receivable broadcasting station registered in advance according to the moving area is selected as described above,
At that time, it is possible to prevent the occurrence of a situation in which a car or the like happens to be in a mountain cover or the like and the broadcast of the selected broadcasting station cannot be fully heard.

That is, when none of the receivable broadcasting stations according to the data read from the broadcasting station list ROM 3 has a received electric field strength of the broadcasting radio wave lower than a certain level and is not automatically selected, the broadcasting ECU 9 causes the tuner 1 to operate. To the broadcast station list R while detecting the level of the field strength of the broadcast radio wave by the electric field strength detector 8 by giving an automatic tuning command to
Even if there is another broadcasting station that is not registered in OM3, if there is a reception electric field strength of the broadcast wave of a certain level or more, it is selected. Even if there is a broadcasting station according to the data read from the broadcasting station list ROM 3 that has a received electric field strength of a broadcast wave of a certain level or higher, another selection given from the automatic tuning switch 7 at any time. In accordance with the station command, the broadcasting ECU 9 may automatically select another broadcasting station whose reception electric field strength of broadcast radio waves not registered is at a certain level or higher.

Therefore, even if all the receivable broadcast stations in a certain area are not registered in the broadcast station list ROM 3 by adding such a channel selection means for other broadcast stations not registered, the It becomes possible to selectively register only those broadcasting stations, and it is also possible to select foreign broadcasting, etc., in which the reception electric field strength of the broadcast radio wave becomes stronger at night.

Note that FIG. 3 shows a specific configuration example of the area code data generator 2, for example, a geomagnetic type or a gyro type that outputs a signal proportional to the direction or the amount of change in the direction according to the traveling direction of the automobile. A direction sensor 21, a distance sensor 22 that generates a pulse signal for each unit traveled distance of the vehicle, and a current on a two-dimensional coordinate that changes momentarily for each unit traveled distance of the vehicle according to output signals of the sensors 21 and 22. The position is obtained by sequential calculation, and the obtained data of the present position is sequentially compared with the regional data corresponding to the two-dimensional coordinates stored in the memory 23 in a block for each unit region. The signal processing device 24 that determines which region the current position is in and generates the code data of the determined region
And an operating device 25 capable of arbitrarily setting the starting point of the automobile on the two-dimensional coordinates. Note that the signal processing device 24 uses the starting point on the two-dimensional coordinates set by the operating device 25 as a reference, and counts the number of pulse signals sent from the distance sensor 22 for each unit traveled distance. While measuring the traveling distance, the course of the automobile is changed from the direction signals sequentially sent from the direction sensor 21, and the current position on the two-dimensional coordinates is obtained moment by moment. Further, the operating device 25
For example, the position data of the starting point of the automobile is signal-processed by, for example, key-inputting one point on the map displayed in correspondence with the two-dimensional coordinates in a matrix or direct pointing with a light pen or the like. 24 can be given.

Thus, in the mobile broadcast radio wave receiving device according to the present invention,
When it is installed in an automobile, for example, it becomes possible to automatically select a receivable broadcasting station that is registered in advance according to the moving area of the automobile simply by operating the automatic tuning switch 7. .

As described above, in the mobile broadcast radio wave receiving apparatus according to the present invention, the storage means in which the data of a plurality of receivable broadcasting stations in each region are registered in advance, and the two-dimensional coordinates corresponding to the plurality of regions are stored. A means for obtaining the current position of the vehicle, determining the area in which the current position exists, and generating predetermined area data corresponding to the area determined from the area data registered in advance for each area, and Means for reading the data of a predetermined broadcasting station from the storage means according to the generated regional data, and detecting the reception electric field strength of the broadcast radio wave at the predetermined broadcasting station according to the read data, which is actually Means for determining whether or not the level is audible and above, and a predetermined broadcasting station that is determined to be above the level is automatically selected with a preset priority. First automatic channel selection means, means for detecting the received electric field strength of broadcast radio waves of a broadcasting station, and determining whether or not the electric field strength is actually above an audible level, and above a certain level. Second automatic tuning means for automatically selecting the broadcast station of the determined broadcast wave, and first automatic tuning when the received electric field strength of the broadcast wave of the predetermined broadcast station is lower than a certain level. Means for switching to the second automatic tuning means to automatically tune to a non-guidance area where the driver of the vehicle equipped with the mobile broadcast radio wave receiver is not sure where he is now. Therefore, it is possible to receive in the area where the current position of the vehicle is, without having to manually specify the area that may cause an error, and in the current situation, the broadcast wave is above the audible level. Broadcast station It has the advantage that it is possible to automatically tune with priority.

Further, according to the present invention, it is not necessary to search for a radio wave having a certain electric field strength level or more by random search and automatically select a channel, so that noise is received or a received electric field strength of a broadcast electric wave becomes strong at night. It has the advantage of being able to automatically select a broadcasting station that is registered in advance for each region only when it is in the audible state without receiving unnecessary broadcasting such as broadcasting. ing.

Furthermore, the invention of the present application is such that when the broadcast waves of broadcast stations that are registered in advance for each region are all below the audible level and automatic tuning is not possible, the broadcast waves will not be received even by unregistered broadcast stations. If it is above the audible level, it can be automatically tuned, and according to the movement situation of the vehicle, a wide range of broadcasting stations in the moving area can be automatically and efficiently tuned to the remarkable effect. It has the advantage that it can be demonstrated.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a mobile broadcast wave receiving apparatus according to the present invention, FIG. 2 is a view showing an example of display contents of a display device in the embodiment, and FIG. 3 is a view showing the same in the embodiment. It is a block diagram which shows the specific structural example of the area code data generator 2. 1 ... Tuner, 2 ... Region code data generator, 3 ...
… Broadcast station list ROM, 4 …… Amplifier, 5 …… Display, 6 …… Display ECU, 7 …… Automatic tuning switch, 8
...... Field strength detector, 9 ...... Broadcast ECU

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-57-152215 (JP, A) JP-A-58-62922 (JP, A) JP-A-59-216016 (JP, A) Actual development Sho-56- 114124 (JP, U)

Claims (1)

[Claims] 1. A storage unit in which data of a plurality of receivable broadcasting stations in each region are registered in advance, and a current position of a vehicle on a two-dimensional coordinate corresponding to a plurality of regions is obtained, and the current position is calculated. A means for determining an existing area and generating predetermined area data corresponding to the area determined from area data registered in advance for each area, and a predetermined means from the storage means according to the generated area data Means for reading the data of the broadcasting station and the reception electric field strength of the broadcast radio wave in the predetermined broadcasting station according to the read data, and whether it is equal to or higher than a certain level that is actually audible. Determining means, first automatic tuning means for automatically selecting a predetermined broadcasting station judged to be above a certain level with a preset priority order, and receiving radio wave of the broadcasting station. A means for detecting the strength and determining whether or not the strength is actually above a certain level to withstand audibility; and a second automatic automatic tuning to a broadcasting station of a broadcast wave judged to be above a certain level. Channel selection means, and means for switching from the first automatic channel selection means to the second automatic channel selection means for automatic channel selection when the received electric field strength of the broadcast radio wave of the predetermined broadcasting station is lower than a certain level. A mobile broadcast radio wave reception device configured by.