JPH0622035A - Data input output device - Google Patents

Abstract

PURPOSE:To provide the data input output device being able to use a memory efficiently and to simplify its management. CONSTITUTION:This device is provided with a file address memory 14 storing the presence of each file in a file memory 13, a head address and a final address, and when data are written newly, a file write control circuit 8 is used to write the data sequentially to a succeeding idle area of the final file in the file memory 13 and when data are deleted, a file delete control circuit 10 is used at first to set data representing the presence of a file in the file address memory 14 to no file and a file transfer control circuit 12 is used in the standby state of the system to transfer data of succeeding files to the area set to be no file in the file memory 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data input / output device that can input / output data in file units and can manage recorded data rationally.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a file memory of a conventional data input / output device. In the conventional data input / output device, the file memory is divided into blocks in advance, one file is managed for each block, and recording and deletion of files are all performed for each block. Therefore, when recording a new file, check whether there is an empty block in which the file has been deleted. If it exists, record it in that empty block. If it does not exist, record it. Currently, it is recorded as the k + 1th block after the last block recorded, for example, the kth block.

[0003]

However, in the above device, when the length of the file is smaller than the one block length secured in advance, the remaining memory in the one block is not used and is wasted. On the contrary, if the file length exceeds 1 block length, the excess data will not be recorded, or one file will be recorded in the next block and a single file will have a multi-block structure, so that the memory can be used efficiently. There was a problem that it could not be used. There is also a method of transferring data using an OS (Operating System), but this method allows the memory to be used efficiently, but management is extremely complicated in order to be able to write another data to the deleted area. There was a problem of becoming.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a data input / output device which can efficiently use a memory and simplify its management.

[0005]

In order to achieve the above object, the present invention has a file memory for accumulating data in file units, and a file address memory for storing the presence / absence of each file in the file memory, a start address and an end address. And a data input means for inputting data to the file memory, a data output means for outputting data from the file memory, and a file write for writing new data in the empty area next to the last file in the file memory. The control means, the file read control means for obtaining the start address and the end address of the arbitrary file from the file address memory and reading the data of the arbitrary file from the file memory, and the data indicating the presence or absence of the file in the file address memory Delete the file by setting No file. The file deletion control means, the file transfer determination means for determining whether the system is in the standby state, and the file transfer determination means when the system is in the standby state A data input / output device comprising a file transfer control means for sequentially transferring data of subsequent files is proposed.

[0006]

According to the present invention, new data is sequentially written in the empty area next to the last file in the file memory by the file write control means. On the other hand, the data is deleted by initially setting the data indicating the presence / absence of a file in the file address memory to no file by the file deletion control means, and then in the standby state of the system, the file transfer control means causes the file memory to be deleted. This is performed by sequentially transferring the data of the following files to the area in which there is no file, thereby eliminating the empty area between each file.

[0007]

FIG. 1 shows an embodiment of a data input / output device of the present invention, which is an example implemented as a voice mail device. In the figure, 1 is a line, 2 is an incoming call detection circuit, 3 is a line termination circuit, 4 is a PB signal receiving circuit, 5 is a response message sending circuit, 6 is a control circuit, 7 is a CODEC, 8 is a file writing control circuit, 9 is a file read control circuit, 10 is a file deletion control circuit, 11 is a file transfer determination circuit,
12 is a file transfer control circuit, 13 is a file memory,
Reference numeral 14 is a file address memory.

As shown in FIG. 3, the file address memory 14 records a file number, presence / absence of a file (displayed as "1" for file presence, "0" for no file), start address and end address. File access is performed based on these data.

FIG. 4 shows the manner of file management in the above apparatus, and the operation will be described below according to this.

First, when an incoming signal detecting circuit 2 receives an analog signal from a subscriber who intends to receive a voice mail service via a line 1, a line terminating circuit 3 connects a communication path. The control circuit 6 receives the incoming call, sends a response message of the incoming call to the subscriber through the response message sending circuit 5, and issues commands for writing, reading, deleting, etc. of voice data to the file memory 13. The signal is received through the PB signal receiving circuit 4 and processed.

Specifically, when a voice is written to the file memory 13, the file write control circuit 8 starts a digital signal through the CODEC 7 from the top address of the empty area next to the last file obtained from the file address memory 14. The voice data converted into the file memory 1
Write in 3 ((a) and (b) in Fig. 4). At this time, even if there is an empty area in the middle of the file, it is ignored.

When the voice is read from the file memory 13, the file read control circuit 9 reads the digital voice data from the start address to the end address of the read file obtained from the file address memory 14, and outputs the voice data through the CODEC 7. Of the response message sending circuit 5 and the line terminating circuit 3
To the subscriber via.

When deleting an audio file, the file deletion control circuit 10 sets the bit in the file address memory 14 indicating the presence / absence of a target file to "0". Thereafter, the file transfer determination circuit 11 determines whether the system is in the standby state, and when the standby state of the system is confirmed, the file transfer control circuit 1
2. By sequentially transferring the subsequent files to the area of the file in which the bit indicating the presence or absence of the file in the file address memory 14 is "0" by 2, the empty area does not occur between the files in the file memory 13. (Fig. 4 (c)).

[0014]

As described above, according to the present invention, it becomes possible to maximize the use of the free memory space in an apparatus for recording and erasing data using, for example, a semiconductor memory, and the write data length can be maximized. It is possible to manage files without generating a wasteful memory space due to the difference. Further, unlike the file management by the OS, it is not necessary to write a new file in the deleted portion,
There is an advantage that file management becomes extremely easy.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a data input / output device of the present invention.

FIG. 2 is a configuration diagram showing an example of a file memory of a conventional data input / output device.

3 is a block diagram showing details of a file address memory of the apparatus shown in FIG.

FIG. 4 is an explanatory diagram showing a state of file management in the apparatus of FIG.

[Explanation of symbols]

1 ... line, 2 ... incoming detection circuit, 3 ... line termination circuit, 4 ...
PB signal receiving circuit, 5 ... Response message sending circuit, 6 ...
Control circuit, 7 ... CODEC, 8 ... File writing control circuit, 9 ... File reading control circuit, 10 ... File deletion control circuit, 11 ... File transfer determination circuit, 12 ... File transfer control circuit, 13 ... File memory, 14 ... File address memory.

Claims (1)

[Claims] 1. A file memory for storing data in file units, a file address memory for storing the presence / absence of each file in the file memory, a start address and an end address, and a data input means for inputting data to the file memory. And a data output means for outputting data from the file memory, a file write control means for writing new data in the free space next to the last file in the file memory, and the start address of any file from the file address memory. And a file read control means for obtaining the final address and reading the data of an arbitrary file from the file memory, and a file deletion control for deleting the file by setting the data indicating the presence or absence of the file in the file address memory to the absence of the file. Means and the system waits File transfer determining means for determining whether or not the file is in the standby state, and when the file transfer determining means notifies that the system is in the standby state, the data of the following files is sequentially transferred to the area of the files deleted up to that point. A data input / output device comprising a file transfer control means.