KR19980069209A - Memory management method of FM additional broadcasting receiver - Google Patents

Abstract

The present invention relates to a memory management method of an FM additional broadcasting receiver, and includes a time-dependent program determination process for determining whether a received additional broadcast program is a time-dependent program and a program received as a result of the time-dependent program determination process. This time-dependent memory area judgment process judges that this time-dependent program determines that the memory of this time-dependent area is full, and the time-dependent memory area judgment process determines the memory of the current time-dependent area. Is stored as a full state, and the overwrite data storage process of storing the received program in the erased memory area after erasing the existing data; and as a result of the time dependent memory area determination process, the memory of the time-dependent area is full. It is determined that it is not (FULL) and terminates the receiving program. As a result of judging the dependent data stored in the empty area of the memory and the time dependent program judging process, it is determined that the receiving program is not a time dependent program, and thus the time independent program storage for storing the program in the time independent memory area accordingly. A program that loses the value of its information over time, that is, a time-dependent program, is stored in the form of an OVER WRITE in a specific memory area, and a time-independent program is FIFO (FIRST IN). In the form of FIRST OUT), the memory can be managed more and more efficiently, and there is no unnecessary memory expansion, resulting in lower cost of the product.

Description

Memory management method of FM additional broadcasting receiver

The present invention relates to a memory management method of an FM additional broadcasting receiver, and in particular, when receiving information data through RDS (Data Radio System) or DARC (Data Radio Channel), the information is time-dependent and time-independent data. The present invention relates to a memory management method of an FM supplementary broadcasting receiver, which divides and stores the data in an area of each memory to efficiently use the memory.

In general, FM sub-broadcasting is a method of multi-transmitting control codes or digital data signals by using subcarriers for FM broadcasting. The frequency of subcarriers in the spectrum margin of conventional FM broadcasting (53-100 kHz) is pilot frequency (19 kHz). Digitally multiply 16 or more codes with PSK waveform modulation near 3 times (57㎑) or 4 times (76㎑) of the) to provide various services such as auto tuning, station name, traffic information, text broadcasting, time information, and wireless calling. Say how you offer. The FM supplementary broadcasting has RDS (Radio Data System) method in Europe with subcarrier of 57KHz, DARC (Data Radio Channel) method in Japan with subcarrier of 76KHz, and RBDS (Radio Broadcast Data System) method in USA Etc. are adopted.

In this case, the data received by the FM additional broadcasting receiver is usually stored in an area of the memory as shown in FIG. 1, and the storage method is usually FIFO (First In First Out). That is, in a state where information data is stored in an area of memory having a certain storage limit and does not exist in an empty area, the first stored data is erased and new data is stored.

Meanwhile, as shown in FIG. 2, a memory management method of a conventional FM additional broadcasting receiver is as follows.

First, the initialization state (S20) proceeds to the program reception determination step (S21). Then, if it is determined in the program receiving completion determination step (S21) that the current FM unit is determined that the reception of the program is to proceed to the memory free area determination step (S22). At this time, if it is determined in the memory free area judging step S22 that the data stored in the current memory area is full, the process proceeds to the initial storage data erasing step S23. In this initial storage data erasing step (S23), the program data stored for the first time among the data stored in the memory is erased, and the program first area storage step (S25) is performed. In this program first area storage step (S25), the received program is stored and terminated in a specific memory free area generated by erasing data initially stored in the current memory.

On the other hand, if it is determined that the reception of the program is not completed as a result of the determination in the program reception completion step (S21), the loop is repeatedly performed continuously, and as a result of the determination in the memory free area determination step (S22), If it is determined that the data is not in the FULL state, the program proceeds to the second area storing step S24 to store and terminate the received program in the existing memory free area.

However, the conventional memory management of the FM additional broadcasting receiver only stores the received data in the memory area in order, and if the memory is in a full state, the memory is first erased regardless of the content and type of the stored data. It is supposed to save new data, but among the data that is actually input, it is a time-dependent program, such as weather forecast and stock information. Recently entered programs are valuable as the information and lose the value as information over time. Because the programs are stored in the memory area together, the efficiency is reduced in terms of memory management.

Accordingly, the present invention has been made to secure such a problem, in which the FM unit classifies additional broadcasting programs received by the broadcast receiving apparatus into time-independent programs and time-dependent programs, and stores the memory regions accordingly. The time independent program is saved and erased by FIFO method, and the time dependent program is saved by erasing the new program in the memory area where the existing program is stored (OVER WRITE) method. It is an object of the present invention to provide a memory management method of a receiving apparatus.

In order to achieve the above object, the present invention provides a time-dependent program judging step of judging whether a specific additional broadcast program is a dependent program, and the received program is a time-dependent program as a result of judging from this time-dependent program judging step. Judging from the dependent memory region judging step of judging whether the memory of this time-dependent region is in a full state, and judging from this dependent memory region judging step, the memory of the current time-dependent region is in a state of full. The overwrite data storage step of storing the received program in the erased memory area after erasing the existing data and the determination of the dependent memory area determination step determines that the memory of the time dependent area is not in the full state. Dependent data storage to store the receiving program in free area of dependent memory And a time-independent memory that determines that the currently received program is not a time-dependent program as determined by the time-dependent program determination system, and thus determines whether the received program is a time-independent program and whether the time-independent memory region is full. As a result of the area judging step and this time independent memory area judging step, it is determined that the time independent memory area is in a full state, and the first data deletion and program storing for deleting the first stored data in the memory area and storing the received program. And an independent data storage step of storing the program in a free area of the independent memory because it is determined that the received program is a time-independent program and that the memory area is not in a full state as a result of the determination in the time independent memory area determination step. Characterized in that consisting of.

1 is a flowchart illustrating a conventional method of storing FM broadcast data.

2 shows an area of a memory in which data is stored according to the method described in FIG.

Figure 3 is a block diagram of the FM additional broadcast receiving apparatus according to the present invention.

4 is a view showing an area of a memory in which data is stored according to the present invention;

5 is a flowchart illustrating a method of managing a memory according to FM supplementary broadcast data according to the present invention.

<Explanation of symbols for main parts of drawing>

1: Tuner part 2: FM additional broadcasting demodulator

3: micom 4: liquid crystal display

5: Key input part 6: External memory

7: Function selection and volume control unit 8: Power amplifier

9: speaker

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Here, the configuration of the FM additional broadcasting receiver according to the present invention includes a tuner unit 1 for tuning and demodulating the selected radio frequency as shown in FIG. 3 and outputting an audio signal, and the FM received by the tuner unit 1. The FM additional broadcasting demodulator 2 for demodulating the FM additional broadcasting data from the frequency, and the data output from the FM additional broadcasting demodulator 2 are processed to control the display to be displayed on the liquid crystal display 4 in the form of letters and numbers. A microcomputer 3, a key input unit 5 for inputting a function setting signal to the microcomputer 3, and an external memory 6 for storing predetermined additional broadcast data connected to the microcomputer 3; .

And a function selection and volume adjusting unit 7 for adjusting the demodulated audio signal received from the tuner unit 1, and a power amplifier for amplifying the audio signal adjusted from the function selection and volume adjusting unit 7 to a predetermined level ( 8) and a speaker 9 for outputting the audio signal amplified by the power amplifier 8 to the outside.

On the other hand, the operation of the FM additional broadcast receiving device having such a configuration as follows. First, when a specific radio frequency is tuned through the tuner unit 1 and additional broadcast data is received through the tuned frequency, the data is demodulated through the FM additional broadcast demodulator 2. Here, the additional broadcast program demodulated by the FM additional broadcast demodulator 2 is displayed in the form of letters and numbers through the liquid crystal display 4 according to the control signal of the microcomputer 3. The additional broadcasting program demodulated by the FM additional broadcasting demodulator 2 is stored in the external memory 6 according to the control signal of the microcomputer 3, wherein the additional broadcasting program stored in the external memory 6 is stored in time. It is divided into a dependent program and a time-independent program (here, a time-dependent program is a program that loses its value as information over time. A time-independent program is also valuable as information over time. As shown in FIG. 4, when a program corresponding to traffic information, weather forecast, and securities information is received, the existing traffic information, weather forecast, and stock information are stored in accordance with the control signal of the microcomputer 3. The new time-dependent program is stored in the area.

On the other hand, if the received additional broadcast program is a program that does not lose its information value over time, such as a specific program data or news, that is, a time-independent program is demodulated through the FM additional broadcasting demodulator (2) it is a microcomputer ( According to the control signal of 3), it is stored in the time-independent area 6b in the area of the external memory 6, and is stored and erased according to the FIFO method.

Here, the memory storage area 6a of the time-dependent program uses the minimum memory in classifying the memory areas, and the memory area 6b of the time-independent program can be set to the maximum to manage the memory more efficiently. have.

Meanwhile, looking at the memory management method according to the area of the memory in more detail, as shown in FIG. 5, the initialization state S1 proceeds to the program reception completion determination step S2. Then, when it is determined in the program receiving completion determination step (S2) that the specific additional broadcast program is received, the process proceeds to the time dependent program determination step (S3). Then, if it is determined in the time-dependent program determination step (S3) that the received program is determined to be a program such as weather forecast and stock information, which are reception dependent programs, the process proceeds to the dependent memory area determination step (S4). At this time, if it is determined in the dependent memory area determination step (S4) that the memory of the current time-dependent area is in a full state, the data overwrite storage step (S5) proceeds to erase the existing data stored in the memory after erasing. The program will then be saved in the area and terminated. In addition, if it is determined in the dependent memory region determining step S4 that the memory of the time dependent region is not in the FULL state, the process proceeds to the dependent data storing step S6 and the received program is stored in an empty area of the memory. Save and exit.

On the other hand, if it is determined in the time-dependent program determination step (S3) that the currently received program is not a time-dependent program, the process proceeds to the independent memory area determination step (S7). At this time, if it is determined in the independent memory area determination step S7 that the received program is a time independent program and the memory area is in a full state, the process proceeds to the initial data deletion and program storage step S8. Then, in the initial data deletion and program storage step (S8), the data stored first in the time-independent memory area is deleted, and the program is stored in the memory free area accordingly, and then terminated. If it is determined that the received program is a time-independent program and the memory area is not full, the process proceeds to the independent data storage step (S9). The program received in the program is saved and terminated.

As described above, the present invention classifies the memory of the FM additional broadcasting receiver into a time-independent region and a time-dependent region, and stores the memory in each region according to the received program. The time-dependent memory region takes an OVER WRITE method. The time-independent memory area uses the FIFO (FIRST IN FIRST OUT) method to effectively manage the limited memory, thereby reducing the additional cost of unnecessary memory.

Claims (1)

In the FM additional broadcast reception mode, the program reception completion process of determining that the reception of the additional broadcasting program is terminated and the program reception completion determination process determine that the specific additional broadcasting program is completed and the currently received program is dependent. The time-dependent program judging process for judging whether the program is a program, and the result of judging from this time-dependent program judging process is determined that the received program is a time-dependent program and judges whether the area of this time-dependent memory is full. The dependent memory region determination process and the dependent memory region determination process determine that the current time-dependent memory region is in a full state, and the received program is stored in the erased memory region after erasing the existing data. Overwriting data storage process and the dependent memo As a result of judging from the area judging process, it is determined that the area of the time-dependent memory is not in a full state. As a result, the time-independent memory area determination process determines whether the currently received program is not a time-dependent program, and determines whether the received program is a time-independent program and whether the time-independent memory area is full. As a result of the determination process, the time-independent memory area is determined to be in a full state, and the initial data deletion and program storing process of deleting the data initially stored in the memory area and storing the received program, and the process of determining the time-independent memory area Judgment shows that the received program is time independent FM additional memory management method of a broadcast receiving apparatus that the program memory area to full (FULL) which is determined as not a state consisting of independent data storage while saving the program in the space area of the independent memory, characterized.