JPH0739129U - Multiplex receiver - Google Patents

Abstract

(57) [Summary] [Object] To provide a multiplex broadcast receiver capable of favorably performing a scanning operation based on an AF list and capable of promptly receiving a broadcast station having a good reception level. [Structure] An AF list is extracted from multiplexed data multiplexed on an incoming broadcast wave, and when the reception level of the receiving broadcasting station deteriorates, a scanning operation is started based on the extracted AF list, A multi-broadcasting receiver for receiving a broadcasting station having a good reception level, the first memory 18 storing broadcasting station data including the position of each broadcasting station and each reception frequency of the broadcasting station, A switch 20 for setting and inputting the current position of the receiver, and selecting a broadcasting station within a predetermined range from the current position based on the setting and inputting current position and the broadcasting station data, and selecting the selected broadcasting station. And the microcomputer 14 that executes the scan operation only.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a multiplex broadcast receiver for receiving multiplex data multiplexed in a normal broadcast.

[0002]

[Prior art]

 Conventionally, as an FM multiplex broadcast received by such a multiplex broadcast receiver, an alternative frequency list (hereinafter simply referred to as an AF list) is included in the multiplex signal. FIG. 7 is a layout diagram showing the service area of each broadcasting station in FM multiplex broadcasting.

As shown in FIG. 7, the AF list indicates the reception frequencies of the broadcasting stations (A to I other than the broadcasting station F) broadcasting the same program as the currently receiving program (broadcasting station F). It is a frequency list to be notified.

The application of the AF list is such that when the reception position deviates from the service area of the currently receiving broadcasting station, the user automatically scans the reception frequency that can be received from the AF list. Is that you can listen to the same program continuously.

Now, the conventional multiplex broadcasting receiver will be described with reference to FIGS. 8 to 11 by applying it to an FM multiplex broadcasting receiver mounted on a moving body such as an automobile. FIG. 8 is a block diagram showing an outline of an FM multiplex broadcasting receiver to which a conventional multiplex broadcasting receiver is applied. FIG. 9 is a block diagram showing a main part of an FM multiplex demodulator in the FM multiplex broadcast receiver.

In FIG. 8, a receiving antenna 11 that receives an incoming broadcast wave, a tuner 12 that tunes the broadcast wave to obtain an FM demodulated signal, and an FM multiplex signal included in the FM demodulated signal is extracted and demodulated. An FM multiplex demodulator 13 that obtains FM multiplex data, a memory 31 that stores the demodulated FM multiplex data, and the tuner 12 are provided with a control signal to perform tuning control, PLL control, and the like. It has a microcomputer 14 that controls the entire broadcasting receiver.

Further, the FM multiplex demodulator 13 is, as shown in FIG. 9, a bandpass filter (hereinafter, simply referred to as a bandpass filter for extracting an FM multiplex signal centered on a subcarrier 76 kHz from the FM demodulated signal obtained by the tuner 12). (Referred to as BPF) 15, a digital demodulator 16 for demodulating the FM multiplex signal into a digital signal, and a code processing 17 for performing synchronization and error correction of the FM multiplex signal demodulated on the digital signal. ing.

Next, the operation of the FM multiplex broadcast receiver will be described. FIG. 10 is a flow chart showing the processing operation of the microcomputer 14 at the time of extracting multiple data (AF list). FIG. 11 is a flowchart showing the processing operation of the microcomputer 14 when selecting another broadcasting station based on the AF list.

For example, as shown in FIG. 7, it is assumed that the receiver exists in the service area of the broadcasting station F and receives the broadcast radio wave from the broadcasting station F.

In FIG. 10, when the broadcast radio wave from the broadcasting station F is received, the FM multiplex demodulator 13 is caused to extract the FM multiplex data contained in the broadcast radio wave, and the AF list is extracted from the extracted FM multiplex data. Is extracted (step S21), and the extracted AF list is stored in the memory 31 (step S22).

Incidentally, when the extracted AF list is stored in the memory 31, as shown in FIG. 7, each broadcast which is performing the same program in each service area of the broadcasting station (A to I). The reception frequencies of the stations, that is, the nine reception frequencies are stored in the memory 31 as an AF list.

Next, as shown in FIG. 7, when it is considered that the receiver is receiving the broadcast radio wave from the broadcast station F and is moving to the service area of the broadcast station E, as a matter of course, it is currently receiving. The reception condition of the broadcast radio wave from the broadcasting station F is deteriorated. Then, the microcomputer 14 starts the operation based on the processing operation shown in FIG. 11 for the AF list previously stored in the memory 31.

In FIG. 11, the flag i indicating the number of scanning operations to each broadcasting station based on the AF list is set to “0” (step S 31), and the i-th broadcasting station from the AF list stored in the memory 31 is received. The frequency is read (step S32), a control signal is sent to the tuner 12, the reception frequency corresponding to the currently receiving broadcasting station is rewritten to the read reception frequency, and the signal is received (step S33). .

Then, the reception content of the broadcasting station corresponding to the received reception frequency, for example, whether or not the electric field strength in the broadcast radio wave from the receiving broadcasting station is sufficiently strong, and whether or not the broadcasting station F is described above. It is checked whether or not the program is the same as the received program, and whether or not the program is good (step S34).

If the result is good in step 34, the broadcasting station being received, which is determined to be good, is set, and the processing operation is ended. It should be noted that according to this example, the broadcasting station E 1 having a good reception level is set.

If the received content is defective in step S34, the flag is incremented (step S35), and the process proceeds to step S32.

Therefore, according to the above-described conventional FM multiplex broadcasting receiver, the AF list multiplexed with the radio waves emitted from the receiving broadcasting station is stored in the memory 31 and the currently received broadcasting is received. When the reception status of the currently receiving broadcasting station deteriorates when moving from the service area corresponding to the station to the service area corresponding to another broadcasting station, it is automatically performed based on the AF list stored in the memory 31. By scanning the reception frequency corresponding to each broadcasting station and setting the broadcasting station that is in a good reception state and is broadcasting the same program, the receiver is good even if the setting operation is not performed. You can listen to the same program in different reception conditions.

[0018]

[Problems to be solved by the device]

 However, according to the conventional multiplex broadcast receiver described above, when the broadcasting station currently being received is the broadcasting station F as shown in FIG. 7, the moving direction of the recipients such as the broadcasting stations A and B is Since the scanning operation is executed based on the AF list stored in the memory 31 even for a long distance broadcasting station, until the broadcasting station with a good reception level is received by the scanning operation. However, there is a problem in that the listener is uncomfortable with the noise generated by the scanning operation for a long-distance broadcasting station.

The present invention has been made in view of the above problems, and an object of the present invention is to perform a scanning operation based on an AF list satisfactorily and to quickly receive a broadcasting station having a good reception level. Another object of the present invention is to provide a multi-broadcasting receiver capable of performing the same.

[0020]

[Means for Solving the Problems]

 In order to achieve the above object, according to the multiplex broadcasting receiver of the present invention, the same program as the program of the receiving broadcasting station is broadcast from the multiplexed data multiplexed in the incoming broadcast wave. When an alternative frequency list that notifies the reception frequency of a broadcasting station is extracted and the reception level of the receiving broadcasting station deteriorates, a scanning operation is started based on the extracted alternative frequency list, and broadcasting with a good reception level is performed. A receiver for multiplex broadcasting that receives a station, and stores and inputs the position of each broadcasting station and broadcasting station data including each reception frequency of the broadcasting station and the current position of the multiplex broadcasting receiver. Setting input means, selecting a broadcasting station within a predetermined range from the current position based on the setting input current position and the broadcasting station data, and selecting the scanning station only for the selected broadcasting station. And having a control unit for executing down operation.

[0021]

With this configuration, based on the broadcasting station data stored in the storage means and the current position of the receiver input by the setting input means, a broadcasting station within a predetermined range from the current position is selected. However, since the scanning operation is executed only for the broadcasting stations within the selected predetermined range, that is, the scanning operation is abandoned for the broadcasting stations at a long distance, the broadcasting station with a good reception level is provided. It is possible to quickly receive the signal and also to prevent the noise generated by the scanning operation for the long-distance broadcasting station.

[0022]

【Example】

 Hereinafter, the multiplex broadcast receiver of the present invention will be described with reference to the drawings by applying it to an FM multiplex broadcast receiver provided in a mobile body such as an automobile. FIG. 1 is a block diagram showing the outline of an FM multiplex broadcasting receiver to which the multiplex broadcasting receiver of the present invention is applied. The same parts as those of the conventional technique are designated by the same reference numerals, and the description of the configuration and operation thereof will be omitted.

The FM multiplex broadcasting receiver shown in FIG. 1 has a configuration in which the memory 31 in the FM multiplex broadcasting receiver shown in FIG. 8 is excluded, and a first memory 18 and a second memory 19 which are storage means are provided. The switch 20 is added.

The first memory 18 stores not only the reception frequency of each broadcasting station but also broadcasting station data such as the position of each broadcasting station and the service area position of each broadcasting station, and the second memory. The scan data, which will be described later, analyzed by the microcomputer 14, which is the control means, is stored in the memory 19.

Note that FIG. 2 is an explanatory diagram that briefly shows the broadcast station data stored in the first memory 18, but in FIG. 2, the horizontal axis is x and the vertical axis is y, and The service area of the broadcasting station is located.

In addition, the switch 20 sets the vehicle position corresponding to the current position of the vehicle of the recipient within the service area of each broadcasting station in the broadcasting station data stored in the first memory 18. It is a setting input means for setting and inputting.

Next, the operation of the FM multiplex broadcasting receiver will be described with reference to FIGS. 1 to 3. FIG. 3 is a flowchart showing the processing operation of the microcomputer 14.

For example, a receiver in the service area of the broadcasting station F sets the vehicle position to the coordinate values (x3, y4) as shown in FIG. 2 when the switch 20 is input.

In FIG. 3, the AF list of the FM multiplex data is extracted from the broadcast radio wave received from the receiving broadcast station F (step S 11), and the extracted AF list and the first memory 18 are stored. The broadcast station data is compared and collated, and the broadcast stations distant from the vehicle position by a predetermined distance or more, for example, the broadcast stations A and B are excluded (step S12), and the broadcast stations (C to I) within the predetermined distance are excluded. The AF list of) is stored in the second memory 19 as scan data (step S13), and the processing operation is finished.

Whether or not the own vehicle position is within a predetermined distance is calculated by using the coordinate values (x3, y4) set as the own vehicle position and each coordinate value (xn, yn) at each broadcasting station. This is done by calculating the distance from the vehicle position to each broadcasting station by the microcomputer 14 and comparing and detecting the calculated distance and a predetermined distance.

[0031]

[Equation 1] Therefore, according to the multiplex broadcast receiver of the above embodiment, the scan data is generated based on the broadcast station data stored in the first memory 18 and the own vehicle position set and input to the switch 20. 2 The memory 19 stores the scan data, and based on the stored scan data, the scan operation is executed only for the broadcasting stations within a predetermined distance from the vehicle position, that is, the scanning operation is performed for the broadcasting stations at a long distance. Since the operation is not performed, it is possible to quickly receive a broadcasting station having a good reception level as compared with the conventional technology and also to prevent noise caused by the scanning operation for the broadcasting station at a long distance. .

In the above embodiment, if the vehicle position is set by the switch 20 in the explanatory view shown in FIG. 2, the switch 20 is input again when the vehicle position is changed next time. There must be.

Therefore, in order to overcome such a situation, as shown in FIG. 4, a frame within a predetermined range is set around the set own vehicle position, and when the own vehicle position moves, If the frame is also automatically scrolled as shown by the dotted line, the input operation of the switch 20 at the time of changing the vehicle position is not required.

Further, in the above embodiment, the input operation of the switch 20 is required in order to set the own vehicle position.

Therefore, in order to overcome such a situation, if the service area corresponding to the broadcasting station F currently being received is set as the own vehicle position as shown in FIG. Although a slight error occurs between the set own vehicle position and the set own vehicle position, it is not necessary to input the switch 20 when setting the own vehicle position.

Further, instead of the switch 20 in the above embodiment, a navigation device 21 which is a route guiding means may be provided as shown in FIG.

Next, the operation of the FM multiplex broadcast receiver equipped with the navigation device 21 will be described.

The microcomputer 14 of the FM multiplex broadcasting receiver grasps the current vehicle position and the traveling direction of the vehicle obtained from the navigation device 21 in real time as vehicle position data.

The microcomputer 14 causes the AF list of the FM multiplex data to be extracted from the broadcast radio wave received from the broadcasting station F in the service area being received, and the extracted AF list is stored in the first memory 18. The broadcast station data and the own vehicle position data obtained by the navigation device 21 are compared and collated, and the scanning operation for the reception frequency of the broadcast stations other than the vicinity of the own vehicle position, for example, the broadcast stations A and B is abandoned. At the same time, the scanning operation for the reception frequencies of the broadcasting stations C, G, I which are in the opposite direction to the traveling direction based on the traveling direction based on the vehicle position data is also abandoned.

The microcomputer 14 stores the reception frequencies of the broadcasting stations D, E, and H as scan data in the second memory 19, and based on the scan data stored in the second memory 19, the broadcasting station D, E, H The scan operation is executed only for the E and H reception frequencies.

Therefore, according to the FM multiplex broadcasting receiver equipped with the navigation device 21, based on the broadcasting station data stored in the first memory 18 and the own vehicle position data obtained by the navigation device 21. The scan data is generated and stored in the second memory 19, and based on the stored scan data, in addition to the broadcasting stations other than the vicinity of the own vehicle position, the broadcasting stations in the direction opposite to the traveling direction of the moving body are detected. Since the scan operation is abandoned for the received frequency, it is possible to quickly receive a broadcast station with a better reception level and prevent the noise generated by the scan operation for the remote station. can do.

[0042]

[Effect of device]

 According to the multiplex broadcasting receiver of the present invention configured as described above, based on the broadcasting station data stored in the storage means and the current position of the receiver inputted by the setting input means, A broadcasting station within a predetermined range is selected, and a scanning operation is executed only for a broadcasting station within the selected specified range, that is, a scanning operation is abandoned for a broadcasting station at a long distance. Therefore, it is possible to quickly receive a broadcasting station having a good reception level, and also to prevent noise caused by the scanning operation for the broadcasting station at a long distance.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of an FM multiplex broadcasting receiver to which a multiplex broadcasting receiving device of the present invention is applied.

FIG. 2 is an explanatory diagram schematically showing data of a service area position of each broadcasting station stored in a first memory.

FIG. 3 is a flowchart showing a processing operation of a microcomputer in the FM multiplex broadcasting receiver.

FIG. 4 is an explanatory diagram schematically showing a scan data setting method in another embodiment.

FIG. 5 is an explanatory diagram showing a scan data setting method according to another embodiment.

FIG. 6 is a block diagram showing an outline of a receiver for FM multiplex broadcasting in another embodiment.

FIG. 7 is a layout diagram showing a service area of each broadcasting station in FM multiplex broadcasting.

FIG. 8 is a block diagram showing an outline of an FM multiplex broadcast receiver to which a conventional multiplex broadcast receiver is applied.

FIG. 9 is a block diagram showing a main part of an FM multiplex demodulator of an FM multiplex broadcast receiver.

FIG. 10 is a flowchart showing a processing operation of a microcomputer when multiplex data (AF list) is extracted.

FIG. 11 is a flowchart showing a processing operation of a microcomputer when selecting another broadcasting station based on multiplexed data (AF list).

[Explanation of symbols]

 14 Microcomputer (control means) 18 First memory (storage means) 20 Switch (setting input means) 21 Navigation device (route guidance means)

Claims (2)

[Scope of utility model registration request] 1. An alternative frequency list for notifying a reception frequency of a broadcasting station broadcasting the same program as that of the receiving broadcasting station is extracted from the multiplexed data multiplexed on the incoming broadcasting wave. A multi-broadcast receiver that starts a scanning operation based on the extracted alternative frequency list when the reception level of the broadcasting station being received deteriorates and receives a broadcasting station having a good reception level, Storage means for storing broadcasting station data including the position of the broadcasting station and each reception frequency of the broadcasting station, setting input means for setting and inputting the current position of the multiplex broadcasting receiver, and current setting position and input Control means for selecting a broadcasting station within a predetermined range from the current position based on the broadcasting station data and executing the scan operation only for the selected broadcasting station. Multiple broadcast receiver. 2. An alternative frequency list for notifying a reception frequency of a broadcasting station broadcasting the same program as that of the receiving broadcasting station is extracted from the multiplexed data multiplexed on the incoming broadcasting wave. A multi-broadcasting receiver that starts a scanning operation based on the extracted alternative frequency list when the reception level of the receiving broadcast station deteriorates and receives a broadcast station having a good reception level, Route guidance means for detecting current position data including the current position and movement direction of the receiver, storage means for storing the position of each broadcasting station and broadcasting station data of each reception frequency of the broadcasting station, and the route guiding means. Based on the obtained current position data and the broadcasting station data stored in the storage means, select a broadcasting station within a predetermined range and moving direction from the current position, and select the broadcasting station as the selected broadcasting station. And a control means for executing the scanning operation only for the receiver.