JP4151917B2 - Mobile receiver - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a mobile receiver.
[0002]
[Prior art]
Conventionally, the area where broadcast waves from 1FM broadcast stations can be received is limited, but the same program can be heard at FM broadcast stations in other areas. For this reason, tuning is performed by adjusting the reception frequency by using numeric keys or dials provided in the radio receiver, the auto search function or the auto scan function, and the same program is listened to in other areas.
[0003]
[Problems to be solved by the invention]
However, even in the same program, if the area is different, the transmission frequency of the broadcasting station will be different. Therefore, the user must keep operating the numeric keys, dial and auto search key provided on the device until the broadcast of the same program is received. Don't be. In addition, there are those that can continue to receive the same program using only ROM (Read Only Memory) (prior application, Japanese Patent Application No. 6-166543), but it is necessary to store the broadcasting station area in advance, so that However, it is not possible to deal with it flexibly.
[0004]
Therefore, the present invention uses alternative frequency data of a broadcast station that broadcasts the same program superimposed on the broadcast radio wave, and automatically tunes to the broadcast radio wave of the broadcast station that broadcasts the same program even if the area is moved. The purpose is to provide a receiver.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, receiving means for receiving a broadcast on which multiplexed information is superimposed and demodulating it into an audio signal,
Extracting means for extracting the multiplexed information contained in the output of the receiving means;
Detecting means for detecting alternative frequency data of at least one broadcasting station that broadcasts the same program included in the multiplexed information from the extracting means;
First storage means for storing a first table in which broadcast areas of at least one broadcast station of the same series distinguished by a position range and frequency data of broadcast stations in each broadcast area are associated;
Control that takes the matching between the alternative frequency data detected by the detection means and the frequency data stored in the first storage means, and creates a second table associating the matching result with the broadcast area Means,
Second storage means for storing the second table;
Positioning means for detecting the current position of the moving body,
The control means compares the current position detected by the positioning means with the broadcast area, obtains a broadcast area where a moving body exists from the first table of the first storage means, and determines the broadcast area for the broadcast area. If the second table of the second storage means is searched for whether or not the alternative frequency data has been broadcast, and it is confirmed that the alternative frequency data has been broadcast, the broadcast area is used as a key from the first storage means. The frequency data of the broadcasting station is read, and the reception frequency of the receiving means is changed based on the frequency data.
[0006]
In order to achieve the above object, in the present invention, receiving means for receiving a broadcast on which multiplexed information is superimposed and demodulating it into an audio signal;
Extracting means for extracting the multiplexed information contained in the output of the receiving means;
Detecting means for detecting alternative frequency data of at least one broadcasting station that broadcasts the same program included in the multiplexed information from the extracting means;
Storage means storing a table in which broadcast areas of at least one broadcast station of the same series distinguished by position range and frequency data of broadcast stations in each broadcast area are stored, and detected by the detection means Control means for matching the alternative frequency data with the frequency data stored in the storage means, and storing the matching result in the storage means in association with the broadcast area;
Positioning means for detecting the current position of the moving body,
The control means uses the stored contents of the storage means to compare the current position detected by the positioning means with the broadcast area to obtain a broadcast area where a moving body exists, and then corresponds to this broadcast area If it is confirmed that the alternative frequency data has been broadcast and if it has been broadcast, the frequency data of the broadcast station in the broadcast area is read, and the reception frequency of the receiving means is changed based on this frequency data It is characterized by making it.
[0011]
[Action]
In the present invention, broadcast areas of the same series and frequency data corresponding thereto are stored in advance, alternative frequency data for broadcasting the same program multiplexed on the program broadcast information is detected, and the detected alternative frequency data The frequency data for each broadcast area stored in advance is compared, and the frequency presence / absence information of the station that broadcasts the same program is recognized for each broadcast area based on the result. As a result, when the reception state of the program being received deteriorates, the same program is broadcast from the presence / absence information of the frequency of the broadcast station of the same program that has been recognized based on the position information obtained by positioning. If it is confirmed, the same program is followed by the stored frequency data.
[0031]
【Example】
FIG. 1 shows a block diagram of a first embodiment of an FM broadcast receiver for a mobile body, for example, a vehicle according to the present invention. The FM antenna 11 is an FM multiplex broadcast for mobiles (hereinafter simply referred to as FM multiplex broadcast) including multiplexed information in which program information and alternative frequency data of a plurality of broadcast stations broadcasting the same program are superimposed in time series. It is an antenna for receiving radio waves. The FM broadcast receiving circuit 13 demodulates the audio portion of the FM multiplex broadcast received by the FM antenna 11 into an audio signal and supplies it to the first input terminal 25a of the output switching circuit 25.
The output of the FM broadcast receiving circuit 13 is also supplied to the multiplexed information extraction / detection circuit 15. The multiplex information extraction detection circuit 15 extracts only the multiplex information if the multiplex information is superimposed on the output of the FM broadcast receiving circuit 13. Then, it is detected whether or not there is a data error in the multiplex information.
[0032]
The CPU 17a of the multiplex information processing circuit 17 is a central processing unit and performs the operations described later.
[0033]
The ROM 17b of the multiplex information processing circuit 17 is a read-only memory and stores programs executed by the CPU 17a and fixed data such as kanji logos. The ROM 17b stores a table shown in FIG. 2 in order to execute the present invention.
[0034]
The table of FIG. 2 will be described in detail. This table relates to frequency data between broadcasting stations of the same series, and has a different table for each different series. The broadcasting area of each broadcasting station is assigned by dividing the position range (for example, x for latitude and y for longitude). The positional relationship between adjacent broadcast areas is not continuous and is appropriately spaced. This is in consideration of the position range in which the FM broadcast receiving circuit 13 can receive radio waves from adjacent broadcast stations that broadcast the same program with optimum sensitivity. Since the frequency data of the broadcasting station is determined in advance in the position range, the frequency data of the corresponding broadcasting station is assigned to each area.
[0035]
The CPU 17a detects the alternative frequency data of the broadcasting station that broadcasts the same program from the multiplexed information from the multiplexed information extraction detection circuit 15, further reads out the broadcasting station frequency data read from the ROM 17b, and matches the detected alternative frequency data. Take. If there is a match with the broadcast station frequency data, there is alternative frequency data corresponding to the broadcast station frequency data. If there is no data that matches the broadcast station frequency data, there is no alternative frequency data corresponding to the broadcast station frequency data. The CPU 17a creates a table associating the presence / absence of alternative frequency data with the broadcast area name as shown in FIG. This table is stored in the RAM 17c which is a readable / writable memory.
[0036]
The GPS antenna 19 is an antenna for receiving radio waves from GPS satellites. The GPS receiving circuit 21 detects the position of the vehicle from the radio wave received by the GPS antenna 21 and supplies the detected position to the multiple information processing circuit 17.
[0037]
The CPU 17a searches the ROM 17b table for the broadcast area where the current position exists. Then, the CPU 17a checks whether or not the alternative frequency data corresponding to the broadcast area has been broadcast in the RAM 17c, and if it is broadcast, reads the broadcast station frequency data of the corresponding broadcast area from the ROM 17b, decodes it, and decodes the control signal. Generated and supplied to the FM broadcast receiving circuit 13. The FM broadcast receiving circuit 13 is tuned to the frequency by the control signal.
[0038]
The table of FIG. 2 in the ROM 17b may be stored in the RAM 17c as shown in FIG. In this case, only the RAM 17c may be used for searching for the broadcast area where the current position exists and for extracting the broadcast station frequency data of the broadcast area.
[0039]
Next, signal processing of program information included in the multiplexed information from the multiplexed information extraction detection circuit 15 will be described. The CPU 17a checks whether or not the program information received for preventing duplicate storage already exists in the RAM 17c, and if not, stores the program information in the RAM 17c. The CPU 17a reads out the program information corresponding to the data selected and specified by the input device 23 from the RAM 17c, decodes the program information into a video signal and an audio signal, and supplies them to the second input terminal 25b of the output switching circuit 25.
[0040]
If the program information corresponding to the data selected and instructed by the input device 23 is not stored in the RAM 17c, the FM multiplex broadcast is received again by the FM broadcast receiving circuit 13 and demodulated. Then, the multiplex information extraction / detection circuit 15 extracts the multiplex information, detects whether or not there is an error in the multiplex information, and outputs it to the multiplex information circuit 17 if there is no error. Next, the multiplex information processing circuit 17 stores the program information in the multiplex information in the RAM 17c, decodes it into a video signal and an audio signal, and outputs it to the second input terminal 25b of the output switching circuit 25.
[0041]
The output switching circuit 25 selects and switches one of the first and second input terminals 25a and 25b according to a command from the input device 23, and outputs a video signal supplied to the input terminal to a CRT (cathode line). Audio signals are output to a speaker 29 to a display device 27 such as a tube or an LCD (liquid crystal display device).
[0042]
The input device 23 is a changeover switch for switching the channel selection method to automatic channel selection or manual channel selection, a user arbitrarily adjusts the frequency at the time of manual selection, a numeric key or dial for designating a program number of program information, etc. This is a device having a switch for controlling the switching of the output switching circuit 25. The data that the input device 23 gives to the multiplex information processing circuit 17 is channel selection method data, frequency data, and program number data of program information.
[0043]
By the way, FM multiplex broadcasting is an information transmission system that broadcasts using an unused frequency band of a stereo audio signal, and alternative frequencies of a plurality of broadcasting stations that broadcast the same program as program information in the unused frequency band. Data is superimposed in time series. The program information includes video information composed of characters and graphics and music information called additional sound.
[0044]
FIG. 6 shows an FM stereo audio signal on which multiplexed information b is superimposed. In this example, multiplexed information b is superimposed and transmitted in a higher frequency band (near 76 KHZ) than the (LR) component of the stereo audio signal so that it does not affect each other with normal FM broadcasting. Broadcast compatibility is ensured.
[0045]
FIG. 7 shows one transmission unit of multiplexed information, which is composed of 176-bit data. Whether or not it is alternative frequency data is identified by the first 4 bits, and the alternative frequency data is b1 = 1, b2 = 0, b3 = 1, b4 = 1 in the order of transmission.
Identified at the time of
[0046]
Next, the operation of this embodiment will be described. While listening to the FM multiplex broadcast, the multiplex information processing circuit 17 receives the alternative frequency data from the FM broadcast receiving circuit 13 and the multiplex information extraction / detection circuit 15 via the FM antenna 11, and stores the table shown in FIG. Created and stored in RAM 17c.
[0047]
Further, the multiple information processing circuit 17 always monitors whether or not it is within the area of the current broadcasting station based on the current position (latitude and longitude) obtained from the GPS receiving circuit 21 via the GPS antenna 19.
[0048]
Then, it is assumed that the user selects the automatic channel selection method using the input device 23. The multiple information processing circuit 17 receives the selection method data from the input device 23 and enters the automatic channel selection mode. When the vehicle moves out of the current broadcast station area, the CPU 17a of the multiple information processing circuit 17 searches the broadcast area from the ROM 17b or RAM 17c based on the current position obtained from the GPS receiving circuit 21. Then, the CPU 17a checks whether or not the alternative frequency data corresponding to the broadcast area has been broadcast in the RAM 17c, and if there is a broadcast, reads the frequency data of the broadcast area from the ROM 17b or the RAM 17c and decodes it. Then, a control signal is generated and supplied to the FM broadcast receiving circuit 13. The FM broadcast receiving circuit 13 receives the control signal and tunes to the frequency.
[0049]
Next, it is assumed that the user selects the manual selection method using the input device 23. The multiplex information processing circuit 17 receives the channel selection method data from the input device 23 and enters the manual channel selection mode, and the user arbitrarily designates the frequency by the input device 23. The CPU 17a of the multiplex information processing circuit 17 receives the frequency data from the input device 23, converts it into a control signal, and supplies it to the FM broadcast receiving circuit 13. The FM broadcast receiving circuit 13 receives this control signal and switches the reception frequency.
[0050]
The above multiple information processing circuit 17 may operate as follows. The CPU 17a stores the detected plurality of alternative frequency data in the RAM 17c in association with the broadcast area of each broadcast station. The CPU 17a obtains the broadcast area where the vehicle is present from the current position from the GPS receiver circuit 21, reads alternative frequency data from the RAM 17b based on the obtained broadcast area, decodes it, generates a control signal, and supplies it to the FM broadcast receiver circuit 13 To do. The FM broadcast receiving circuit 13 receives the control signal and tunes to the alternative frequency.
[0051]
FIG. 5 shows a block diagram of a second embodiment of the FM broadcast receiver for a mobile body, for example, a vehicle of the present invention. Components that are the same as those in FIG. 1 are given the same reference numerals, and only differences from FIG. 1 will be described.
[0052]
The FM broadcast receiving circuit 13 demodulates the sound part of the FM multiplex broadcast, measures the reception sensitivity, and supplies it to the multiplex information processing circuit 31.
[0053]
The multiple information processing circuit 31 performs functions and operations different from those of the multiple information processing circuit 17 of FIG.
[0054]
The CPU 31a of the multiplex information processing circuit 31 detects alternative frequency data of a broadcasting station that broadcasts the same program from the multiplex information from the multiplex information extraction detection circuit 15, and stores it in the RAM 17c. There are a plurality of alternative frequency data.
[0055]
When the reception sensitivity from the FM broadcast receiving circuit 13 does not exceed a predetermined level (this may be the case when the vehicle moves out of the current broadcasting station area or when the vehicle enters a place where broadcasting is difficult to reach. The CPU 31a obtains the information, reads one of the alternative frequency data from the RAM 17c, decodes it, generates a control signal, and supplies it to the FM broadcast receiving circuit 13. The FM broadcast receiving circuit 13 receives the control signal, tunes to the alternative frequency data, measures the reception sensitivity, and supplies it to the multiplex information processing circuit 31.
[0056]
If the reception sensitivity is not equal to or higher than the predetermined level, the CPU 31a reads alternative frequency data different from the previous one from the RAM 31c, decodes it, and generates a control signal. Thereafter, the same operation as described above is performed. This time, if the reception sensitivity of the FM broadcast receiving circuit 13 is not equal to or higher than the predetermined level, the CPU 31a reads out another alternative frequency data from the RAM 31c, decodes it, and generates a control signal. Thereafter, the same operation as described above is performed.
[0057]
At this time, if the reception sensitivity of a predetermined level or higher is not obtained even if the alternative frequency data is read out and tuned, the tuning operation is repeated by returning to the originally received frequency.
[0058]
As described above, in the automatic channel selection mode, the CPU 31a sequentially reads the alternative frequency data from the RAM 31c until the reception sensitivity of the FM broadcast receiving circuit 13 is optimized, that is, until the FM 31 is tuned to the broadcast station in the destination area. The reception frequency of the broadcast receiving circuit 13 is changed.
[0059]
In the above-described embodiment, an example of FM multiplex broadcasting has been described. However, the present invention is not limited thereto, and may be a broadcast on which multiplexed information is superimposed, such as radio multiplex broadcasting of other systems.
[0060]
【The invention's effect】
According to the present invention, it is possible to easily select a broadcast station in the destination area of the broadcast receiving circuit automatically even if the vehicle moves out of the current broadcast station area.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the configuration of a first embodiment of a vehicular FM broadcast receiver according to the present invention;
FIG. 2 is a table diagram stored in a ROM.
FIG. 3 is a table diagram stored in a RAM.
FIG. 4 is a table diagram stored in a RAM.
FIG. 5 is a block diagram showing a configuration of a second embodiment of the vehicle FM broadcast receiver according to the present invention;
FIG. 6 is a diagram showing a frequency distribution of FM multiplex broadcasting.
FIG. 7 is a diagram illustrating one transmission unit of multiplexed information.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... FM antenna, 13 ... FM broadcast receiving circuit, 15 ... Multiple information extraction detection circuit, 17 ... Multiple information processing circuit, 17a ... CPU, 17b ... ROM, 17c ... RAM, 19 ... GPS antenna, 21 ... GPS receiving circuit, 23 ... Input device, 25 ... Output switching circuit, 27 ... Display device, 29 ... Speaker, 31 ... Multiple information processing circuit, 31a ... CPU, 31b ... ROM, 31c ... RAM.

Claims (2)

Receiving means for receiving a broadcast on which multiplexed information is superimposed and demodulating it into an audio signal;
Extracting means for extracting the multiplexed information contained in the output of the receiving means;
Detecting means for detecting alternative frequency data of at least one broadcasting station that broadcasts the same program included in the multiplexed information from the extracting means;
First storage means for storing a first table in which broadcast areas of at least one broadcast station of the same series distinguished by a position range and frequency data of broadcast stations in each broadcast area are associated;
Control that takes the matching between the alternative frequency data detected by the detection means and the frequency data stored in the first storage means, and creates a second table associating the matching result with the broadcast area Means,
Second storage means for storing the second table;
Positioning means for detecting the current position of the moving body,
The control means compares the current position detected by the positioning means with the broadcast area, obtains a broadcast area where a moving body exists from the first table of the first storage means, and determines the broadcast area for the broadcast area. If the second table of the second storage means is searched for whether or not the alternative frequency data has been broadcast, and it is confirmed that the alternative frequency data has been broadcast, the broadcast area is used as a key from the first storage means. A mobile receiver comprising: reading out frequency data of the broadcasting station and changing a reception frequency of the receiving unit based on the frequency data. Receiving means for receiving a broadcast on which multiplexed information is superimposed and demodulating it into an audio signal;
Extracting means for extracting the multiplexed information contained in the output of the receiving means;
Detecting means for detecting alternative frequency data of at least one broadcasting station that broadcasts the same program included in the multiplexed information from the extracting means;
Storage means storing a table in which broadcast areas of at least one broadcast station of the same series distinguished by position range and frequency data of broadcast stations in each broadcast area are stored, and detected by the detection means Control means for matching the alternative frequency data with the frequency data stored in the storage means, and storing the matching result in the storage means in association with the broadcast area;
Positioning means for detecting the current position of the moving body,
The control means uses the stored contents of the storage means to compare the current position detected by the positioning means with the broadcast area to obtain a broadcast area where a moving body exists, and then corresponds to this broadcast area If it is confirmed that the alternative frequency data has been broadcast and if it has been broadcast, the frequency data of the broadcast station in the broadcast area is read, and the reception frequency of the receiving means is changed based on this frequency data A receiver for a mobile object, characterized in that

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