JP2911386B2 - FM multiplex 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 FM multiplex receiver, and more particularly to an FM multiplex receiver which is applied to, for example, a so-called "visible radio" and displays on a monitor broadcast data of a sequential program contained in an FM multiplex signal. About.

[0002]

2. Description of the Related Art In a conventional FM multiplex receiver, successive reception processing is performed.
Non-batch-type sequential programs to be processed are displayed on a monitor each time broadcast data is received from a broadcasting station.

[0003]

For example, when such a sequential program and a collective recorded program to be recorded and received are displayed, for example, at a store, there is a demand to automatically display all of them sequentially. In order to fulfill this request, it is necessary to appropriately update the page of the program and shift to another program. However, the page update of the recorded program and the transition from the recorded program to the sequential program can be managed by a timer. However, the display update timing of the sequential program cannot be managed by the timer because the broadcast station manages the display timing. Thus, the transition from the sequential program to the recorded program cannot be managed by the timer. In other words, if the time is determined by the timer, if the number of pages of the sequential program that can be displayed is large, display omission occurs.

[0004] Therefore, a main object of the present invention is to provide an FM multiplex receiver capable of displaying a program one after another without losing a page and then terminating the program display.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an FM multiplex receiver for displaying, on a monitor, broadcast data of a sequential program included in an FM multiplex signal, wherein each of the pages constituting the program of the received broadcast data is displayed . Page detection means for detecting a page number, page number N1 of broadcast data received last time
And the page number N2 of the broadcast data received this time .
An FM multiplex receiver comprising: a comparing unit, and a reception terminating unit for terminating the reception of the sequential program in accordance with a comparison result of the comparing unit.

[0006]

For example, each time the CPU receives broadcast data of a sequential program, it detects the page number of the received data each time. Then, the page number N1 of the broadcast data received last time is compared with the page number N2 of the broadcast data received this time, and the reception of the program is sequentially terminated according to the comparison result. For example, if the first detected page number is “1”, the CPU terminates reception when page number N1> page number N2 is detected once, and if the first detected page number is not “1”, Page number N1> Page number N
When 2 is detected twice, reception ends.

[0007]

According to the present invention, the reception of the sequential program is terminated according to the comparison result of the page numbers.
After displaying all the pages that can be displayed, the display of the program can be sequentially terminated. The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0008]

FIG. 1 shows a frame structure of a digital signal (broadcast data) multiplexed on an FM broadcast signal. One frame is composed of 272 blocks.
A 6-bit BIC (Block Identification Code) is added, and is used for reproduction of frame synchronization and block synchronization. Of the 272 blocks, 190 blocks are packets for transmitting data, and 82 blocks are parity packets for transmitting parity in the column direction. In the data transmission packet, a 176-bit data packet and a 14-bit CRC (Cyclic Returndancy Cooperation) follow the BIC.
de) and an 82-bit parity part are provided.

The FM multiplex signal on which such broadcast data is multiplexed is transmitted to the antenna 1 of the FM multiplex receiver 10 shown in FIG.
2 and provided to the front end 14. At the front end 14, the FM multiplex signal is converted into an IF signal by the oscillation frequency signal from the local oscillation circuit 16. The converted IF signal is thereafter subjected to FM detection by an IF amplification and detection circuit 18, and the FM detection signal is converted to a multiplexer 20 and a LMSK (Level-cotrolled Minimum S
hift Keying). The multiplexer 20 generates an audio signal based on the FM detection signal.
The MSK demodulation circuit 22 demodulates the broadcast data having the frame configuration shown in FIG. The demodulated broadcast data is synchronously reproduced in accordance with the BIC and error-corrected in accordance with the parity code in the synchronous reproduction and error correction circuit 24, and the broadcast data that has undergone these processes is supplied to the CPU 26.

When a key input signal for automatically sending a program is given from the operation buttons 28, the CPU 26
This broadcast data is processed according to the algorithm shown in FIG. That is, first, referring to FIG.
Selects a number with the program number "1" contained in the data packet of the broadcast data, and then determines whether or not this program is a sequential program in step S3. Here, “YES”
If so, the program is automatically displayed sequentially in step S5, and the process proceeds to step S11. If "NO" in step S3, the program is regarded as a recorded program, and in step S7 whether all the program data have been received. Judge whether. If “NO”, the process proceeds to step S11.
If "YES", the recording program is automatically displayed in step S9, and then the process proceeds to step S11. In step S11, it is determined whether there is a next program, and "NO"
If so, return to step S1, but if "YES",
In step S13, the next program is selected, and the process returns to step S3.

In step S5, the CPU 26 performs processing according to FIG. That is, first, in step S15, the flag 30a included in the memory 30 is set, and the memory area 30b for writing the old page number N1 and the counter 30d are initialized. Next, step S1
In step 7, a broadcast data receiving process is performed.
To determine if there is received data. If there is no received data, the display time of the previously received broadcast data on the monitor 32 is previously set in the memory area 34 in step S21.
It is determined whether or not the maximum display time set in e has been exceeded. If "NO", the process returns to the step S17, but if "YES", the process ends. On the other hand, if there is received data in step S19, the page number of the received data is written in the memory area 30c as a new page number N2 in step S23, and it is determined in step S25 whether the flag 30a is set.

If the flag 30a is set, it is determined in step S27 whether the new page number N2 written in the memory area 30c is "1". If "NO", the process directly proceeds to step S31 to reset the flag. If "YES", the counter 30d is set to "1" in step S29, and the process proceeds to step S31. If “NO” is determined in the step S25 or the process in the step S31 is completed,
With reference to the memory areas 30b and 30c, it is determined whether or not the old page number N1> the new page number N2. If "YES", the counter 3 is set in step S35.
0d is incremented, and it is determined whether or not the count value = 2 in step S37. Then, if “YES” in the step S37, the process ends, but a step S3
7 and “N” in step S33.
If "O", display processing is performed on the broadcast data received in step S17 in step S39. Then, in step S41, the new page number N2 is written in the memory area 30b as the old page number N1, and step S41 is performed.
Return to 17.

In step S9, the CPU 26 performs processing according to the algorithm shown in FIG. That is, first, in step S43, the flag 34a is reset, and the counter 34b is reset.
Is set to "1", and the maximum page number of this recorded program is written in the memory area 34c. Next, in step S45, it is determined whether or not the flag 34a is set. If "NO", a display process of the broadcast data corresponding to the page number written in the memory area 34b is performed in step S55, and then, in step S57. Sets the flag 34a. Thereafter, in step S59, the timer 34d is reset, and the process returns to step S45. In addition,
The timer 34d continues to measure time except for being reset in step S59. If it is determined in step S45 that the flag 34a has been set, it is determined in step S47 whether the time of the timer 34d has exceeded a display time preset in the memory area 34e. If “NO” here, the process returns to the step S45, but if “YES”,
In step S49, the page number of the memory area 34b is incremented. Subsequently, in step S51, it is determined whether or not the page number of the memory area 34b ≦ the maximum page number. If "NO" here, the process is terminated.
If "YES", the flag 34a is reset in a step S53, and the process returns to the step S45.

In operation, when a recorded program is selected, the page is updated every time set in the timer 34d, and the recorded programs are sequentially displayed on the monitor 32. When the last page of the recorded program is displayed, another program is selected according to the program number. At this time, if the selected program is a sequential program, an update process is performed according to the page number received first and the display time of the page according to the flowchart of FIG. 4, and then the display of the sequential program ends.

That is, if the page number of the broadcast data received first in step S17 is "1", the value of the counter 30d is set to "1" in step S29.
Thereafter, in step S33, it is determined whether or not the old page number N1 (0)> the new page number N2 (1). In this case, since "NO", the broadcast data of the page number "1" is displayed on the monitor 32. . In this way, the broadcast data display process is continued. For example, when the broadcast data of page number "1" is received after the broadcast data of page number "3" is displayed, the old page number N1 (3) is obtained in step S33.
> New page number N2 (1) is determined. Therefore, the value of the counter 30d becomes "2" in step S35, and C
The PU 26 terminates the sequential program reception.

On the other hand, if the page number of the broadcast data received first at step S17 is, for example, "2" other than "1", the broadcast data of page number "3" is displayed for the first time after displaying the broadcast data of page number "3". When receiving broadcast data,
In step S35, the value of the counter 30d becomes "1".
Thereafter, when the broadcast data of the page number “1” is received again by continuing the reception of the program, step S35 is performed.
And the count value becomes "2". Thereby, the reception of the sequential program ends.

When the reception of the successive programs is completed in this way, the program shifts to another program according to the program number. The flow of automatic display of a sequential program will be described with reference to a configuration example of the sequential program shown in FIG. It is assumed that the maximum display time is set to 15 seconds. The number following # shown in FIG. 6 is a page number, and the time shown next to the arrow is the display time.

When the page number of the broadcast data received first is "1", the old page number> the new page number is 1
Since the process is terminated when the number of times is detected, in this example, the display is terminated in the following flow, for example. (1) → (2) → (3) → end (4) → (5) → (6) → end (12) → (13) → (14) → (15) → (16) → end Receive first When the page number of the broadcast data obtained is other than "1", the process is terminated when the old page number> the new page number is detected twice, so that the broadcast data is displayed in the following flow in this example. .

(2) → (3) → (4) → (5) → (6) → end (13) → (14) → (15) → (16) → (17) → (18) → end ( 15) → (16) → (17) → (18) → End If the display time of a certain page exceeds the maximum display time during automatic display, the process will end at that point and broadcast as follows The data is displayed.

(5) → (6) → (7) → (8) → (9) → (10) → end (7) → (8) → (9) → (10) → end First received data When the display time exceeds the maximum display time, the process is terminated at that point, and the data is displayed in the following flow. (10) → End (11) → End According to this embodiment, the reception of the sequential program is terminated according to the comparison result between the old page number and the new page number. The display of the sequential program can be terminated without repeatedly displaying the same data.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing a frame configuration of a digital signal multiplexed on an FM broadcast signal;

FIG. 2 is a block diagram showing one embodiment of the present invention.

FIG. 3 is a flowchart showing a part of the operation of the embodiment in FIG. 1;

FIG. 4 is a flowchart showing a part of the operation of the embodiment in FIG. 1;

FIG. 5 is a flowchart showing a part of the operation of the embodiment in FIG. 1;

FIG. 6 is an illustrative view showing one portion of an operation of the embodiment in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... FM multiplex receiver 22 ... LMSK demodulation circuit 24 ... Synchronous reproduction | regeneration and error correction circuit 26 ... CPU 30,34 ... Memory 32 ... Monitor

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takashi Okubo 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Software Co., Ltd. (56) References JP-A-4-130886 (JP, A) JP-A-1-125128 (JP, A) JP-A-6-216718 (JP, A) "Technical conditions of FM multiplex broadcasting suitable for mobile reception among" signals that can be superimposed on FM broadcast radio waves "" Association, May 1993. (58) Fields investigated (Int. Cl. ⁶ , DB name) H04J 1/05 H04H 1/00 H04B 1/16

Claims (3)

(57) [Claims] 1. An FM multiplex receiver for displaying, on a monitor, broadcast data of a sequential program included in an FM multiplex signal, wherein the page detection means detects a page number of each page constituting a program of the received broadcast data. , comparison means for comparing the page number N2 of the broadcast data received this time and page number N1 of broadcast data previously received,
An FM multiplex receiver comprising: a reception termination unit that terminates reception of the sequential program according to a comparison result of the comparison unit. 2. The reception termination means according to claim 1, wherein when the first detected page number is “1”, the reception is terminated when the page number N1> the page number N2 is detected once. FM multiplex receiver. 3. The reception termination means terminates reception when the page number N1> the page number N2 is detected twice, if the first detected page number is not "1".
3. The FM multiplex receiver according to claim 2.