JP3234458B2 - FM multiplex broadcast receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an F / F for multiplexing and transmitting screen display data for displaying characters and images to an audio signal of a main program by using a current FM broadcast radio wave.
It relates to a receiver for M multiplex broadcasting.

[0002]

2. Description of the Related Art In recent years, as shown in FIG.
+ R) and an FM stereo audio signal composed of a difference signal (LR), after multiplexing screen display data composed of a character code or the like in a band shifted from a baseband band of the audio signal, FM multiplex broadcasting that performs modulation and transmission has been put to practical use.

A receiver for FM multiplex broadcasting usually has a small display capable of displaying characters of several crosses, and performs a scroll display for each line or a collective display of a plurality of lines. By receiving such FM multiplex broadcasting, it is possible to receive services of various information such as the name of a broadcasting station and program of FM broadcasting, news, weather forecast, and traffic information.

FIG. 3 shows an example of a program configuration of FM multiplex broadcasting, in which a program number is assigned to each of a plurality of programs. When the "weather forecast" program is selected from among the menu screens, the weather forecast for each prefecture in the Kinki region is displayed over six pages under the program number 030. When a program of “traffic information” is selected, program number 0 is selected.
Under 40, traffic information of each main road is displayed over four pages. These plural pages are turned by operating a next page key arranged on the operation panel.

Incidentally, data to be added to FM multiplex broadcasting can include display control data for controlling the screen display in addition to screen display data such as character codes. For example, by interposing a time command in the middle of a character code, it is possible to suspend the character display in one page for a predetermined time in the middle of the character, which is effective for timing control when switching the lyrics display of karaoke. It is.

[0006]

However, in the conventional FM multiplex broadcasting receiver capable of responding to the time command, when the additional data includes the time command, the conventional FM multiplex broadcast receiver always responds to the time command. Since the structure for interrupting the character display was adopted, for example, by repeatedly pressing the next page key, when trying to select a desired page by repeating a plurality of pages constituting one program, If an unnecessary page includes a time command, character display is interrupted at that time, and there is a problem that it takes time to turn the page until reaching a desired page.

[0007] An object of the present invention is to provide an FM multiplex broadcast receiver capable of quickly turning pages as required.

[0008]

In the FM multiplex broadcast receiver according to the present invention, the screen display data is constituted by a character code,
Further, the display control data is constituted by a time command for interrupting the character display in one page in the middle of the character for a predetermined period of time, receiving means for receiving FM multiplex broadcasting, and performing FM demodulation on the received signal. Demodulating means for extracting additional data from the demodulated signal, and displaying the screen display data included in the extracted additional data under the control of the display control data.
Display means for displaying each page, page feed operation means to be operated when sending the display of the display means to the next page, fast-forward operation means to be operated when fast-forwarding the displayed page, and fast-forward operation Invalidation means for invalidating the display control of the screen display data by the display control data only in the case of the fast-forward operation in accordance with the operation of the means.

A main audio signal and additional data are extracted by subjecting the received FM multiplex broadcast signal to FM demodulation, and the main audio signal is emitted from a speaker through an audio signal reproduction process as necessary. On the other hand, the additional data is sent to the display means, and the screen display data included in the additional data is displayed. At this time, when the additional data includes the display control data, the screen display data is displayed under the control by the display control data. Specifically, since the screen display data is a character code and the display control data is a time command, the character code is decoded, characters are displayed, and if a time command is interposed in the middle,
At that time, the character display is interrupted for a predetermined time.

When a page feed operation is performed after the display of the screen display data for one page is completed, the display shifts to the display of the next page, and the display of the screen display data is similarly performed under the control of the display control data. It is. On the other hand, when the fast-forward operation is performed, the display control data included in the additional data is invalidated, and the screen display data is displayed without performing the control by the display control data. More specifically, since the screen display data is a character code and the display control data is a time command, the characters are displayed one after another, ignoring the time command. Therefore, page turning is performed quickly,
A desired page can be reached in as short a time as possible.

In a specific configuration, the page feed operation means and the fast-forward operation means are constituted by a common next page key, and by continuously pressing the next page key for a predetermined time or more, a page is operated. The feed switches to fast forward.

[0012]

According to the FM multiplex broadcasting receiver of the present invention, the page can be quickly turned by operating the fast-forward operation means as needed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows the configuration of an FM multiplex broadcast receiver according to the present invention. antenna
A specific broadcasting station is selected from the FM multiplex broadcast wave received by (1) by the FM tuner (2), and FM detection and stereo demodulation are performed. With this, FM tuner
Stereo demodulated output of the baseband band (0 to 53 kHz) obtained from (2), that is, a sum signal (L + R) and a difference signal
The FM stereo audio signal composed of (LR) is supplied to an audio signal reproduction circuit (3), where it is converted into a right channel signal and a left channel signal. Sound is emitted from (4).

A frequency band (53 to 100 kHz) higher than a base band obtained from the FM tuner (2).
Is supplied to a data demodulation circuit (5),
-MSK demodulation is performed, whereby additional data is obtained.

In the present embodiment, the additional data includes a character code and a time command, and a plurality of programs are constituted by character information as shown in FIG.
It is sent as M multiplex broadcast. Each program is composed of a plurality of pages, and a program number is assigned to each page.

The additional data obtained from the data demodulation circuit (5) shown in FIG. 1 is supplied to a microcomputer comprising a CPU (6), a ROM (7) and a RAM (8). CPU (6)
Is connected to a next page key (9) and a display (10), and by operating the next page key (9), the display (10) is
Is switched. A computer program for controlling a screen display operation is registered in the ROM (7) as described later. In addition, the character code of the received program is stored in the RAM (8) over a plurality of pages, and then the stored character code is read out as necessary.
Provided for display by the display (10).

Here, every time the next page key (9) is pressed once, the display screen is sent by one page. In the example program of FIG.
In the "weather forecast" of the program number 030, for example, when the next page key (9) is operated once in the display state of the weather forecast of Osaka, the weather forecast of the next page of Hyogo is displayed on the display (10). . Further, if the next page key (9) is operated four times, weather forecasts from Kyoto Prefecture to Wakayama Prefecture are sequentially displayed.
By operating the next page key (9) again, the display returns to the display page of the weather forecast in Osaka Prefecture.

As described above, when a plurality of pages are sequentially displayed on the display (10), if a time command is interposed between character codes constituting any of the pages, the time command is added to the time command. Character display is interrupted accordingly. Then, after a predetermined time has elapsed, the character display of the page is restarted.

On the other hand, if the next page key (9) is continuously depressed, the page feed is switched to the fast forward. Even if a time command is interposed between the character codes, this is ignored. To quickly display all the characters contained on the page.

FIG. 4 and FIG. 5 show the procedure of the screen display control of the CPU in response to the operation of the next page key. FM
When the power of the multiplex broadcast receiver is turned on, first, in step S1 of FIG. 4, a timer time1 for measuring the interruption time of the character display by the time command and a setting for ignoring the time command are set. After initially setting the flag to 0, it is determined in step S2 whether drawing of characters for one page has been completed. It is determined to be YES immediately after the power is turned on, and the process shifts to step S3 to determine whether or not the next page key is pressed. Note that the flag fl
When ag is 1, the time instruction is ignored, and when 0, the time instruction is not ignored.

If the next page key is not operated and the answer is NO in step S3, the process returns to step S2. afterwards,
If the next page key is pressed and YES is determined in step S3, the process proceeds to step S4, where the page counter page is counted up, and in step S5, the pressing time of the next page key is measured. Timer ti for
Initialize me2 to 0.

Note that two timers time1 and tim
For e2, the interrupt processing shown in FIG. 5 is executed every 0.1 second. When it is determined in step S11 that the timer time1 is a positive value, the timer time1 is counted down in step S12. If the next page key is pressed in step S13, it is determined in step S14 whether the timer time2 exceeds a predetermined value S of the continuous pressing time. If NO, the timer time2 is determined in step S15. Count up.

Next, in step S6 of FIG. 4, it is determined whether or not the flag flag is 1, that is, whether or not the page fast-forward mode is set.
In step S7, it is determined whether or not the timer time1 is a positive value.

When NO is determined in step S7,
That is, when the character display interruption time is set to 0, the process proceeds to the code analysis of step S8. Thereby, either the character code or the time command is analyzed. Then, in step S9, it is determined whether or not the analysis result is a time command.
At 10, one character is drawn according to the analyzed character code. If YES, the process returns to step S2 after setting a predetermined integer value N to the timer time1 in step S11.

Therefore, when the time command is analyzed by the code analysis in step S8, N is determined in step S11.
Is determined to be greater than 0 in step S7, and the character drawing process from the next step S8 to step S10 is stopped. Then, when the timer time1 is counted down to 0, the determination in step S7 is NO, and the character drawing process from step S8 to step S10 is restarted.

After the drawing of a plurality of characters constituting one page is started and until the drawing of all the characters is completed, NO is determined in step S2, and the process proceeds to step S12.
It is determined whether the next page key has been pressed. If the next page key has been pressed, it is determined in step S13 whether or not the timer time2 has exceeded a predetermined value S of the continuous pressing time, and if so, the flag flag is set to 1 in step S14. Move to step S6. If NO is determined in step S13, the flag fl
The process proceeds to step S6 while maintaining ag at 0. or,
If it is determined in step S12 that the next page key has not been pressed, the process proceeds to step S15 and the flag flag is set.
Is set to 0.

Therefore, if the next page key is continuously depressed while drawing a plurality of characters constituting one page, the determination in step S13 becomes YES, and the flag flag is set to 1 in the next step S14. As a result, the determination in step S7 is bypassed by the subsequent step S6, and the process proceeds to code analysis in step S8. As a result, even if the timer time1 is set to an integer value of 1 to N by the time command, the process always proceeds from step S8 to step S8.
Ten character drawing processes are executed, and all characters constituting the page are promptly displayed.

According to the FM multiplex broadcast receiver, the page feed is switched to the fast forward by continuously pressing the next page key (9), so that a plurality of pages constituting one program can be selected. A desired page can be quickly selected and displayed.

The description of the above embodiment is for the purpose of describing the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof.
In addition, the configuration of each part of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims. For example, in addition to character codes, video data and other multimedia information can be handled as additional data.

In addition to the next page key or in place of the next page key, a previous page key for returning the displayed page one page at a time in the forward direction is provided, and the previous page key is continuously depressed. It is also possible to employ a configuration for realizing the page rewinding.

Further, in the above-described embodiment, the page is switched to the fast-forward by continuously pressing the next page key. However, a dedicated page fast-forward key and a page fast-reverse key are provided. Can also be adopted.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an FM multiplex broadcast receiver according to the present invention.

FIG. 2 is a diagram showing a frequency spectrum of FM multiplex broadcasting.

FIG. 3 is a diagram illustrating an example of a program configuration of FM multiplex broadcasting.

FIG. 4 is a flowchart illustrating a control procedure of character display based on an operation of a next page key.

FIG. 5 is a flowchart of a timer interrupt process.

[Explanation of symbols]

 (1) Antenna (2) FM tuner (5) Data demodulation circuit (6) CPU (7) ROM (8) RAM (9) Next page key (10) Display

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-8-331073 (JP, A) JP-A-6-233262 (JP, A) JP-A-4-281686 (JP, A) JP-A-6-233686 30385 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04B 1/16

Claims (2)

(57) [Claims] 1. A main audio signal is multiplexed with additional data including screen display data and display control data in a band shifted from a baseband band of the main audio signal, and the multiplexed signal is subjected to FM modulation and transmitted. In the FM multiplex broadcasting receiver, the screen display data is constituted by a character code, and
The display control data indicates the character display in one page
And a time command that interrupts only for a predetermined time.
Ri, receiving means for receiving an FM multiplex broadcasting, performs FM demodulation on the received signal, demodulating means for extracting the additional data from the demodulated signal, the screen display data included in the extracted additional data, wherein 1 under control by display control data
Display means for displaying on each page, a page feed operation means to be operated to display said display means when sending the next page, and fast forward operation means to be operated to fast-forward the display page, the fast forward operation Depending on the operation of the means ,
When only, FM multiplex broadcasting receiver, characterized in that it comprises a disabling means for disabling the display control of the screen display data by the display control data. 2. The page forward operation means and fast forward operation.
The means is constituted by a common next page key.
Is pressed continuously over a certain period of time.
2. The FM multiplex broadcast receiver according to claim 1 , wherein page forwarding is switched to fast forwarding .