JPH11136143A - Information receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly detect teletext broadcasting by setting the number of processing when a tuning frequency does not coincide with a stored multiplexed broadcasting frequency less than the time of processing when they coincide. SOLUTION: A ROM which stores prescribed data such as a control program and a RAM which functions as a transmitter information storing means 51 that stores frequency information of a transmitter 3 which sends teletext broadcasting in each receivable area and also stores received character information are connected to a CPU. The CPU functions as a processing number setting means 52 which sets the number of receiving processing when a tuning frequency does not coincide with a multiplexed broadcasting frequency stored in each receivable range less than the number of processing when they coincide. Also, when character information is detected in receiving processing in a tuning frequency that does not coincide with the multiplexed broadcasting frequency stored in the RAM, it functions as an updating means 53 which makes the RAM store the tuning frequency as a multiplexed broadcasting frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information receiving apparatus mounted on a vehicle for receiving and displaying character information transmitted from an external information transmitting apparatus (broadcasting station) using radio waves of teletext broadcasting. .

[0002]

2. Description of the Related Art Conventionally, in text multiplex broadcasting using FM radio waves or the like, information transmitted from an information transmitting apparatus is defined as one screen composed of a fixed format (for example, three lines of 15 characters per line). A plurality of pages constitute one program, and the programs include traffic information, weather information, program information, and the like.

[0003] In addition, in order to reduce the user's trouble of tuning (tuning) operation, the character information receiving apparatus for receiving the above-mentioned teletext has a tuning frequency changed within an FM frequency band, and is currently being transmitted. Some have a so-called seek function for detecting teletext broadcasting.

In the receiving process in the seek operation, the frequency to be tuned is set to, for example, +0.1 (or -0.1) MHz.
Check the presence or absence of FM broadcast while changing
When broadcasting is being performed, it is performed by checking whether or not FM multiplex broadcasting is being performed by detecting block synchronization or the like. The process of detecting the block synchronization is performed a plurality of times at predetermined intervals in consideration of the case where the reception state is not very good.

[0005]

However, in the above-mentioned conventional receiving apparatus having a seek function of detecting a text multiplex broadcast being transmitted by changing a tuning frequency, a broadcast station which does not originally perform FM multiplex broadcast is required. However, since the same processing is performed by the station performing the seek operation, there is a problem that the seek operation becomes awkward and takes time especially in an area where there are many broadcast stations.

In order to smoothly perform the above-described seek operation and reduce the required time, a receiving apparatus is provided with a list of broadcasting stations performing FM multiplex broadcasting and their frequencies, and sequentially receives only a certain frequency of text multiplex broadcasting. It is conceivable to check the state, but this causes a problem that a broadcasting station that has newly started FM multiplex broadcasting cannot receive it.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an information receiving apparatus capable of detecting text multiplex broadcasting more smoothly and receiving a broadcasting station which has newly started text multiplex broadcasting is provided. The task is to provide.

[0008]

As shown in FIG. 6, according to the first aspect of the present invention, character information transmitted from an external information transmitting apparatus 3 is installed in a vehicle and transmitted by using a radio wave of a text multiplex broadcast. In the information receiving apparatus 2 for receiving and displaying, the receiving means 50 for performing the set number of times of the text multiplex broadcast receiving process while changing the tuning frequency and the multiplex broadcast frequency of the information transmitting apparatus for transmitting the text multiplex broadcast are stored. A transmitting device information storage means 51, and a processing frequency setting for setting the processing frequency when the tuning frequency does not coincide with the multiplex broadcast frequency stored in the transmitting device information storing means 51 to be smaller than the processing frequency when the frequency coincides. Means 52, when character information is detected in reception processing at a tuning frequency that does not match the stored multiplex broadcast frequency, the tune frequency is set to the multiplex broadcast frequency. Te and updating means 53 to be stored in the transmitting device information storage unit 51, is characterized in that a display unit 54 for displaying character information received by said receiving means 50.

According to a second aspect of the present invention, in the first aspect, a current position detecting means 55 for detecting a current position is provided, and the transmitting apparatus information storing means 51 sets a multiplex broadcasting frequency of an information transmitting apparatus for transmitting a text multiplex broadcasting. Memorize for each reception area,
The processing number setting means 52 sets the processing number when the tuning frequency does not match the multiplex broadcast frequency corresponding to the receivable area including the detected current position to be smaller than the processing number when matching. Features.

[0010]

According to the information receiving apparatus 2 of the present invention, the number of reception processes when the tuning frequency does not match the stored multiplex broadcast frequency is set to be smaller than the number of reception processes when the tuning frequency matches. Receiving processing is performed. Therefore, the receiving process is performed in a short time for a broadcasting station where the text multiplex broadcasting has not been conventionally performed, so that the seek operation is awkward and the receiving process time is shortened.

[0011] Further, even when the tuning frequency does not match the stored multiplex broadcasting frequency, the reception processing operation is performed, so that it is possible to receive even a broadcasting station which has newly started teletext multiplex broadcasting, and to obtain the tuning that does not match. When text information is detected in frequency, the tuning frequency is stored as a multiplex broadcast frequency in the transmitting device information storage means 51 by the updating means 53, so that the newly started text multiplex broadcast from the next time will be used. There is an effect that reception can be performed more reliably.

According to the information receiving apparatus 2 of the present invention, the number of times of reception processing is determined based on the multiplex broadcast frequency stored for each receivable area including the current position detected by the current position detecting means 56. Is set, and the detection processing of the text multiplex broadcast is performed for the set number of processing times.

As described above, when the tuning frequency does not match the multiplex broadcast frequency selected based on the current position, the reception process is performed in a shorter time than when the tuning frequency matches.
It is possible to determine whether character multiplexed data is added to the tuned radio wave more smoothly and in a shorter time.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 5 are diagrams for explaining an information receiving apparatus according to the present invention. FIG. 1 is an overall configuration diagram of a text multiplex broadcasting apparatus including the above receiving apparatus, and FIG. 2 is a specific example of the above receiving apparatus. FIG. 3 is a schematic diagram of a visible radio (registered trademark), FIG. 3 is a diagram showing a display example of the receiving device, FIG. 4 is a block diagram showing the configuration of the receiving device, and FIG. 5 is a flowchart for explaining the operation of the receiving device. FIG.

In FIG. 1, reference numeral 1 denotes a broadcasting device for performing text multiplex broadcasting by FM broadcasting.
The vehicle includes an information receiving device 2 mounted on a vehicle for receiving and displaying character information, and an information transmitting device 3 for wirelessly transmitting predetermined character information to the receiving device 2.

The receiving apparatus 2 specifically includes a teletext-only receiving apparatus 2 shown in FIG. 2, and the receiving apparatus 2 includes a display 6 functioning as a display unit for displaying received text information. ing.

The display 6 is provided with display sections 6a to 6c for displaying the character information in three lines, and the display position, display time and the like of the character information on the display 6 can be arbitrarily changed. I have.

The receiving device 2 has a predetermined program name,
Operation function keys (preset switches) F1 to F4 (representative code 11) in which functions and the like are registered, a direction key (cursor key) 12 for moving a cursor and the like, and a function for registering in the preset switches 11 and the like A switch 7, a power switch 4, and a volume switch 5 are provided.

The character information transmitted from the transmitting device 3 and displayed on the display 6 has a format shown in FIG. 3, and displays a header 8 indicating a source of the information and the contents of the information. One screen composed of the text 9 is defined as one page,
One program is composed of a plurality of pages.

As shown in FIG. 4, the receiving device 2 functions as a receiving means for receiving the teletext signal transmitted from the transmitting device 3 and also has an antenna 16 for receiving a normal audio signal, and A tuner unit 18 for demodulating FM multiplexed data from the received signal,
A demodulation unit 19 for passing an audio signal and the tuner unit 1
And a CPU 20 for controlling the reception of the received character information on the display 6 and the like.

The CPU 20 functions as a ROM 23 in which predetermined data such as a control program is stored, as well as a transmitting device information storing means for storing frequency information of a transmitting device for transmitting a text multiplex broadcast for each receivable area. ,
A RAM 24 for storing the received character information is connected, and predetermined data is input and output from the ROM 23 and the RAM 24.

The CPU 20 is connected to an audio converter 26 for converting the received character information into an audio signal. The converted audio signal is supplied to an amplifier (amplifier) in the same manner as an audio signal of a normal audio broadcast. Speaker 2 via amplifier) 27
8 is output.

The CPU 20 is connected to a GPS 30 as a current position detecting means for detecting a current position.

The CPU 20 sets the number of times of reception processing when the tuning frequency does not match the multiplex broadcast frequency stored in the RAM 24 for each receivable area to be smaller than the number of times of processing when it matches. When character information is detected in the reception processing at a tuning frequency that does not match the multiplex broadcast frequency stored in the RAM 24, the tuning frequency is stored in the RAM 24.
And a function as an updating means for storing as a multiplex broadcast frequency.

Next, the reception control operation of the above-described embodiment will be described with reference to FIG. First, the predetermined frequency +0.
After the value increased (decreased) by 1 MHz (or -0.1 MHz) is set as the tuning frequency, the process waits for a predetermined time (steps S1 and S2).

Next, the list data in which the frequency information of the transmission device stored in the RAM 24 is set for each receivable area is referred to. In this case, the list corresponding to the receivable area including the detected current position is referred to, and the set tuning frequency matches the FM broadcast frequency of any transmitting device (broadcasting station) transmitting the FM broadcast. N1 is set to the decrement count variable CNT1 when it is set, and N2 is set when it is not coincident. When the tuning frequency is equal to the multiplex broadcast frequency of the broadcast station transmitting the text multiplex broadcast, the decrement count variable CNT2 is set. Is set to M1, and if they do not match, M2 is set (step S3). In addition,
The above-mentioned subtraction count variables CNT1 and CNT2 indicate the number of reception processes, and N1, N2, M1 and M2 are all integers larger than 0.

Here, the variables N1 and M2 when the tuning frequencies do not coincide with the FM broadcasting frequencies and the multiplex broadcasting frequencies in the list and the variables N2 and M2 coincide with each other.
By setting N1> N2 and M1> M2 to be smaller than 1, the number of reception processes in the case where the frequency originally has no FM broadcast and the frequency in which there is no text multiplex broadcast is reduced to simplify the reception process. It is configured to:

First, in step S4, when the FM broadcast is not received at the set tuning frequency, the FM broadcast receiving process in step S4 is performed only the number N1 or N2 times of the variable CNT1 set in step S3. Is performed (steps S12 to S14), and the variable CNT1 is set to 0
If the FM broadcast is not received before reaching step S1
When the process shifts to 1 and the tuning frequency change operation is not performed (step S11), the reception control operation is ended.

Next, when no character multiplexed data is detected in step S5, the character information detecting process in step S5 is performed only the number of times M1 or M2 of the variable CNT2 set in step S3 (steps S8 to S8).
S10) If no character information is detected from the received radio wave until the variable CNT2 becomes 0 and no tuning frequency changing operation is performed (step S11), the reception control operation is terminated.

At the tuning frequency set above, FM
In the case where a broadcast is received, and furthermore, when the synchronization of the FM multiplex block, which is text information, is detected from the received radio wave and the text multiplex broadcast is received, it is determined that the tuning frequency is the transmission frequency of the text multiplex broadcast. If the information is not recorded in the list indicating the information, it is determined that the tuned frequency is a multiplex broadcast tuned frequency including character data, and the contents of the list are updated (steps S4 to S7), and the reception control operation is terminated. .

As described above, the number of reception processings when the tuning frequency does not match the multiplex broadcasting frequency stored as the FM text multiplex broadcasting is stored is set to be smaller than the number of reception processings when the frequency coincides. The frequency of a broadcasting station that does not implement FM multiplex broadcasting will be checked in a shorter time than the frequency of a broadcasting station that implements FM multiplex broadcasting.
That can shorten the time required for the reception process,
Broadcast detection operation can be performed smoothly.

In addition, even if the tuning frequency does not coincide with the multiplex broadcasting frequency in the above list, the detection of the multiplex broadcasting is checked. Therefore, when a broadcasting station which does not carry out the multiplex broadcasting originally starts the broadcasting. But we can.

Further, the information of the broadcasting station that has newly started the multiplex broadcasting is recorded in the transmitting device information list, and the list is updated. Therefore, at the next reception, the broadcasting station that has newly started the multiplex broadcasting will be described. , The time required for receiving the broadcast can be shortened, and the teletext can be more reliably received.

Further, since the transmitting device information is stored for each receivable area, it is possible to more reliably receive the currently receivable teletext.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a text multiplex broadcasting device including an information receiving device according to the present invention.

FIG. 2 is a schematic diagram of a radio that can be seen as a specific example of the receiving device.

FIG. 3 is a diagram illustrating a display example of the receiving device.

FIG. 4 is a block diagram illustrating a configuration of the receiving device.

FIG. 5 is a flowchart for explaining the operation of the receiving device.

FIG. 6 is a diagram illustrating the configuration of the claims of the present invention.

[Explanation of symbols]

 Reference Signs List 2 information receiving device 3 information transmitting device 6 display (display means) 16 antenna (receiving means) 18 tuner section (receiving means) 20 CPU (processing number setting means, updating means) 24 RAM (transmitting device information storing means) 30 GPS (Current position detection means)

Claims (2)

[Claims] An information receiving apparatus mounted on a vehicle and receiving and displaying character information transmitted from an external information transmitting apparatus by using a radio wave of a text multiplex broadcast. A receiving means for performing a set number of reception processes, a transmitting apparatus information storing means for storing a multiplex broadcasting frequency of an information transmitting apparatus for transmitting a text multiplex broadcasting, and the tuning frequency being stored in the transmitting apparatus information storing means. Means for setting the number of times of processing when the frequency does not match the multiplex broadcast frequency being set to be smaller than the number of times of processing when matching the multiplex broadcast frequency; When it is detected, an update means for storing the tuning frequency as a multiplex broadcast frequency in the transmitting device information storage means, and a receiving means for receiving the tuning frequency. An information receiving apparatus, comprising: display means for displaying received character information. 2. The apparatus according to claim 1, further comprising a current position detecting means for detecting a current position, wherein said transmitting apparatus information storing means stores a multiplex broadcasting frequency of an information transmitting apparatus for transmitting a multiplex teletext for each receivable area. The processing frequency setting means sets the processing frequency when the tuning frequency does not coincide with the multiplex broadcast frequency corresponding to the receivable area including the detected current position to be smaller than the processing frequency when the processing frequency coincides. Characteristic information receiving device.