JPH0226889B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention detects and corrects errors occurring in data processing or data transmission within an information storage device such as an optical disk or other information input/output device. This invention relates to an error correction device.

2. Description of the Related Art As a conventional error correction device for double encoding such as a product code, a device having the configuration shown in FIG. 3 is known.

In FIG. 3, 20 is a first-stage code decoder;
21 is a storage device, 22 is a second stage code/decoder, 2
3 is a control device, 24 is an information input/output terminal, and 25 is a code input/output terminal connected to a communication path.

During encoding, input information from the information input/output terminal 24 is first encoded in the first stage encoder 20, and this is stored in the storage device 21.
Furthermore, second-stage encoding is performed by the second-stage code/decoder 22, and this is outputted to the communication channel via the code input/output terminal 25.

In this case, the data flow is entirely controlled by the control device 23.
controlled by

The data flow during decoding is the opposite of the data flow during encoding described above.

Problems to be Solved by the Invention However, in the conventional error correction device, the control system for controlling the storage device 21 and the second-stage code decoder 22 is complicated due to its configuration.

For this reason, for example, when trying to improve the correction ability by performing decoding in three or four stages,
Alternatively, when it is desired to perform single encoding using a single code decoder (only one stage), there is a problem that this type of conventional apparatus cannot handle the case.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an error correction device that simplifies the control system of a code decoder and the like and that solves the above-mentioned problems that cannot be addressed by conventional devices.

Means for Solving the Problems In order to achieve the above object, the error correction device of the present invention includes a buffer storage circuit, a control circuit that controls input and output of the buffer storage circuit, and a control circuit that controls the input and output of the buffer storage circuit through the control circuit. The basic configuration is to connect an even number of code/decoders in multiple stages, and convert the processing directions of the code/decoders in the even and odd stages.

Function Since the code/decoding system is configured with the buffer storage circuit, control circuit, and code/decoder as one unit,
Even when this encoding/decoding system is configured in multiple stages such as two stages or three stages, each control system is simplified and the overall control system does not become complicated.

Further, with a device having a single-stage encoding/decoding system, single encoding/decoding processing becomes possible.

Moreover, if the code/decoding system has a multi-stage configuration, more advanced correction ability can be exhibited.

Embodiment FIG. 1 is a schematic block diagram showing an embodiment of the error correction circuit of the present invention.

In this embodiment, an apparatus is shown as a representative example in which the encoding/decoding system has a two-stage configuration and is capable of double encoding processing.

In Fig. 1, 1 is the code/decoding system of the first stage, 2
is a second-stage code/decoder system, and these code/decoder systems 1 and 2 each include a buffer storage circuit 11,
A control circuit 12 for controlling the input/output of this buffer storage circuit 11 and a code decoder 13 controlled via this control circuit 12 are combined into one unit. 3 is an information input/output terminal;
4 is an information input/output device such as an optical disk (not shown)
This is the sign input/output terminal for .

Next, the operation will be explained.

During encoding, information is input from the information input/output terminal 3 to the control circuit 12 of the first-stage code/decoder system 1, and then input to the buffer storage circuit 11 and the code/decoder 13 through the control circuit 12, respectively. be done.

An error check code (an error detection code and an error correction code) is generated in the code decoder 13, and the generated check code is output to the outside together with the information when the information is output from the buffer storage circuit.
In other words, it won't be blown away.

After the input of one unit of information to be encoded and its encoding are completed, a check code is called from the buffer storage circuit 11 via the control circuit 12, and this check code is input to the second stage code decoding system 2. Performs product code (double encoding) processing.

By the way, in order to realize a product code, as shown in Figure 2, the first stage (first stage) and the second stage (next stage)
It is necessary to change the encoding processing direction.

Therefore, when the error check code generated by the first-stage code/decoding system 1 is once input to the buffer storage circuit 11 and then output from the circuit 11, the encoding direction is changed. Of course, similar change processing is performed in the second-stage code/decoding system 2 as well.

The error check code double encoded in this manner is outputted to an information input/output device (not shown) via the code input/output terminal 4.

During decoding, the operation is the reverse of encoding. In other words, the code is input from the information input/output device to the code input/output terminal 4.
The signal is then input to the second stage code/decoder system 2. The input code is temporarily stored in a buffer storage circuit, and when output from the circuit, the direction of the code is changed and decoding processing is performed. The signal obtained by this decoding process is
The data is inputted to the control circuit 12, and thereafter subjected to the same processing as described above, corrected and outputted to the information input/output terminal 3.

In this embodiment, a case has been described in which the code/decoding system has a two-stage configuration, but a multi-stage configuration such as three or four stages can also be used.

Effects of the Invention As detailed above, the present invention has a basic configuration of a code/decoding system that enables coding/decoding processing using a buffer storage circuit, a control circuit, and a code/decoder as one unit. Even when a plurality of stages are added to the coding/decoding system having this basic configuration to form a multi-stage configuration, each control system is simplified, and the control system of the entire device is not complicated.

In addition, in the case of a multi-stage configuration, only the first stage is used during encoding, and the other code/decoding systems from the next stage onwards are not operated, and all code/decoding systems are operated during decoding to improve the correction ability. It is easy to modify the configuration to allow for so-called irregular use, such as improving the performance.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an error correction device according to an embodiment of the present invention, FIG. 2 is a schematic diagram for explaining a change in the encoding processing direction, and FIG. 3 is a block diagram of a conventional error correction device. be. 1, 2... Code decoding system, 11... Buffer storage circuit, 12... Control circuit, 13... Code decoder,
3... Information input/output terminal, 4... Code input/output terminal.

Claims (1)

[Claims] 1 Encoding and decoding processing can be performed using a buffer storage circuit that temporarily stores information, a control circuit that controls input/output of this buffer storage circuit, and a code/decoder that is controlled via this control circuit as one unit. An even number of code/decoding systems are connected, and the code/decoding systems in odd-numbered stages have a main scanning direction as their processing direction, and the code/decoding systems in even-numbered stages have a processing direction in a sub-scanning direction. Error correction device.