JPS63254843A - Character string converting system - Google Patents

Abstract

PURPOSE:To reduce the transmission time by segmenting a bit string data depending on the head bit value and inserting prescribed number of '0s' to the head so as to apply the information processing system if it does not support the transparent mode. CONSTITUTION:When the head bit of an input data 11 is '1', a 6-bit data is segmented 12 and when the head bit is '0', a 7-bit data is segmented 13. Then bits '00' are inserted 14 to the head of the 6-bit data and the 7-bit data is inverted and then '0' is inserted to the head 15. When the head bit is '0' the 6-bit data is segmented 12 and when the head bit is '1', the 7-bit data is segmented 13 and the 6-bit data is inverted and '00' is inserted 14 to the head and '0' is inserted 15 to the head of the 7-bit data. Thus, an optional 8-bit data string is converted into the 8-bit data string of a prescribed range.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a character string conversion method, and in particular, to convert an arbitrary 8-bit data string (character string) through a communication system that does not support transparent mode. The present invention relates to a character string conversion method suitable for efficient transmission and reception with an information processing system on the other side.

[Conventional technology]

Conventionally, in general, the transmitting side, the receiving side, and all information processing systems interposed therebetween have been aware of the transparent mode and have transmitted and received transparent data using the following procedure (format). That is, (D L E )(S T
X) (Transmission data) (DLE) (ETX)
That was the procedure. Here, when the same data as the above-mentioned (DLE), that is, the transmission control extended character, is included in the transparent data, this has been converted to (DLE) (DLE).

An example of a device that converts character strings is the code conversion device disclosed in Japanese Patent Laid-Open No. 147332/1983. This device converts each character (8-bit data) into data with a different bit pattern (bit data that is a multiple of 8) by referring to a code conversion table.

[Problem that the invention seeks to solve]

The above conventional technology has the following problems. In other words, in the above-mentioned general technology, there is no IC installed for the case where the information processing system intervening during communication does not support transparent mode, and in this case, data having the same bit pattern as the control character is There was a problem in that the information could not be sent to the other party's information processing system.

This will be explained in some detail below.

Recently, personal computers are being introduced into the business field, and in order to easily realize this introduction, it is desirable to connect the personal computer to a host computer as an asynchronous non-procedural terminal device.

To do this, it is necessary to make sure that the transparent mode is not set to 1. When sending, data from (1) (00) 16 to (IF) 0. is processed as a control character.

(2) (80)□6~(FF)0. data will not be accepted.

From the two points, the transmission data is (20)□6~(7F),6
It is necessary to keep it within the range of.

On the other hand, although the device disclosed in JP-A No. 61-147332 solves the above-mentioned problems, it does not take into account the efficiency of data transmission and processing or the reduction of storage capacity. Since the degree of data expansion caused by conversion is large, there are problems in that the transmission time becomes long and the storage capacity becomes large.

The present invention has been made in view of the above circumstances, and its purpose is to solve the above-mentioned problems in conventional character string conversion methods or character string conversion devices, and to improve the information processing system that intervenes during communication. Suitable for applications that do not support transparent mode, short transmission time,
An object of the present invention is to provide a character string conversion method that can reduce storage capacity.

[Means for solving problems]

The above object of the present invention is to convert any 8-pi1-data string into
In a character string conversion method that converts to an 8-bit data string within the range excluding control characters, if the first bit 1- is II 171, cut out the 6-bit data and convert the first bit to II OI.
In the case of I, the process involves cutting out 7-bit data, inserting bit 1100'4 at the beginning of the 6-bit data, inverting this, and inserting the bit "it On" at the beginning of the 7-bit data. A character string conversion method consisting of a processing process, or
In the case of IT, 6-bit data is cut out, and the first bit is Lr.
In the case of 1)), the process of cutting out 7-bit data,
The 6-bit data is achieved by a character string conversion method that includes the steps of inverting this, inserting bit II OOr+ at the beginning, and inserting bit LL O11 at the beginning of the 7-bit data. .

[Effect]

First, in the invention described in claim 1, an input 8-bit data string is cut out every 7 bits or every 6 bits, so that the value of the first bit becomes xi O
7 bits if u, 6 bits if the first bit is '1''
Cut out the bits. As a result, the input data string is divided into a group of 7-bit data whose first bit is 110 II (this is called the "A group") and a group of 6-bit data whose first bit is '1' (this is called the "B group"). ).

Next, invert the data of the above A group and add rt to the beginning.
o”, the data of group A is changed to (
4O) Convert to a group of 8-bit data in the range from aS to (7F)□6 (this will be referred to as a "C group").

Furthermore, by adding 00''' to the beginning of the data of group B, the data of group B is converted to (20)x-
~(3F)1. A group of 8-bit data in the range (
This is called the "D group").

In the invention described in claim 2,
If the value of the first bit is "0", 6 bits are extracted, and if the value of the first bit is "1", 7 bits are extracted.The subsequent processing is performed in the same way, and a group of 7-bit data has the bit "" at the beginning. By inserting 0'', (40)□, ~(7
F) i, is converted into a group of 8-bit data in the range of ,.

~(3F), s is converted into a group of 8-bit data.

Through the processing described above, any 8-bit data string becomes (
2o) Converted to an 8-bit data string in the range from us to (7F)l@.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. The following description will be made regarding embodiments corresponding to the invention set forth in claim 1, but the same applies to the invention set forth in claim 2.

FIGS. 1(a) and 1(b) are block diagrams showing the configurations of a transformer and an inverse transformer, respectively, showing one embodiment of the present invention. In FIG. 1(a), 11 is input data, 12
is a bit string extraction section, 13 is a bit string inversion section that inverts a bit string, and I4 is a bit 110011 at the beginning of the bit string.
15 is a bit 1'0'' insertion section that inserts a pitch I-"O" at the beginning of the bit string. 16 is an 8-bit data output section that outputs an 8-bit data string. , 17 indicate output data.

When the first bit of the input data 11 is ItOII (group A), the bit string extraction section 12 takes in 7 bits from this bit and transfers them to the bit string inversion section 1.
It has a function to send to 3. At this time, if the input data is less than 7 bits, the missing part 110 II is added to make it 7 bits data. Furthermore, when the first bit is "1" (group B), it has a function of taking in 6 bits from this bit and sending them to the bit "OO" insertion section 14. Note that, at this time, if the input data is less than 6 bits, the missing part 110 II is added to make it 6 bit data, as before.

The bit string inverter 13 inverts all the sent 7 bit strings and outputs CLt Ojj→″1″′, ″″1″→″″0
It has a function of sending the bit "0" to the bit "0" insertion section 15. The bit "00" insertion section 14 has a function of adding bit "00" to the head of the sent 6-bit string and sending it to the 8-bit data output section 16 as 8-bit data. Further, the bit II O+7 insertion section 15 has a function of adding bit 110 jt to the beginning of the sent 7-bit string and sending it to the 8-bit data output section 16 as 8-bit data.

The 8-bit data output unit 16 has a function of outputting the sent bit string in units of 8 bits and creating output data 17.

In addition, in FIG. 1(b), 21 is input data, 22
23 is a bit string inversion section that inverts the bit string; 24 is a bit number adjustment section that adjusts the number of bits; 25 is an 8-bit data output section that outputs an 8-bit data string; 26 is an output data output section. It shows. Each of these means has a function of performing inverse processing of the processing in the above-mentioned conversion device.

That is, 8-bit data 21 converted by the conversion device
It has the function of accepting the bit "0" or "OO" inserted by the conversion device, and returning the inverted part to the original state to restore the 8-bit data string before conversion.

The operation of this embodiment configured as described above will be explained below.

FIG. 2(a) is a diagram illustrating the conversion operation by the conversion device of this embodiment. Since the first bit of the input data: i is '0', the bit string extraction unit 12 extracts '00'.
00010" (7) 7 bits are read and sent to the bit string inversion section 13. At this time, an internal flag (not shown) is turned off to prevent reading of subsequent input data. This internal flag is set to It is turned on by a signal from the 8-bit data output section 16, and when turned on, the next input data is read.

The bit string inversion unit 13 converts the above "0000010"' and "
Execute an exclusive OR operation with 1111111''',
The operation result “l 111101” is applied to the bit 110.
II insertion section 15. In the pit 0″ insertion part 15,
The bit string “01111101” obtained by adding “0” to the front of the bit string “1111101” is sent to the 8-bit data output unit 16.

The 8-bit data output unit 16 outputs "2-bit 8-bit data"
01111101 (hexadecimal number, (7D), G)" and sends a read control signal to the bit string extraction section 12. The bit string extraction section 12 turns on the internal flag according to the read control signal and performs the following Read the input data. In this case, the first bit is LL I I+, so
Read the 6 bits of “110010” and select the pins 1 to I.
I OOI+ Send to insertion unit 14. Then, turn off the internal flag again. Bit 1100 I+ insertion section 14 is
The bit string “001.10010” obtained by adding “oo” to the front of the bit string “110010” is sent to the 8-bit data output unit 16.

The 8-bit data output unit 16 outputs the 8-bit data “O
O110010 ((32), 6)'' in hexadecimal notation is output, and a read control signal is sent to the bit string extraction unit 12.

After that, repeat this operation to create an 8-bit data string (
05), (90), , (input data + which is 88La)
11 is an 8-bit data string (7D), G (32)□6 (7
'y), , (2o), G, and each 8-bit data is converted into (20)1. It falls within the range of ~(7F)□. Note that the last bit string of the input data is
As described above, if the number of bits is less than 6 or 7 bits, the bit string extraction section 12 adds the missing portion IIO11.

Next, the operation of inverse transformation will be explained.

FIG. 2(b) is an explanatory diagram of the inverse transformation operation by inverse transformation drawing of this embodiment. Since the first two bits of the input data 12 are "01", the redundant bit removal unit 22
The 7 bits of "1111101" excluding 'O' are sent to the bit string inverter 23. At this time, as before, the internal flag not shown is turned off and the subsequent input data is not read. This internal flag is
It is turned on by a signal from the bit number adjustment section 24, and when turned on, the next input data is read.

The bit string inversion unit 23 converts the above "1111101" and "1"
111111”, and the result of the operation “0000010” is sent to the bit number adjustment unit 24.
send to Since the result of combining the internally stored bit string (initially empty string) and the input bit string is less than 8 bits, the bit number adjustment unit 24 stores it internally and performs read control. The signal is sent to the redundant bit removing unit 22
send to

The redundant bit removal unit 22 turns on the internal flag according to the control signal from the bit number adjustment unit 24, reads the next input data, and since the first two bits are 'oo', '
The six bits of "110010" from which "00" has been removed are sent to the bit number adjustment section 24. Then, the internal flag is turned off again.

The bit number adjustment unit 24 internally stores a bit string,
The above "0000010" and the mold y h column, the above "11"
0010” and the first 8 bit string “0”
0000101” is sent to the 8-bit data output section 25.

Then, the remaining bit string, in this case "10010", is stored and a read control signal is sent to the redundant bit removing section 22.

The 8-bit data output unit 25 outputs the 8-bit data “O
Outputs OO00101 ((05)□,)" in hexadecimal. After repeating this operation, the redundant bit removal unit 22 outputs the next one with the internal flag turned on by the control signal. If there is no input data, send a data clear signal to the bit number adjustment unit 24.Bit number adjustment unit 2
4 clears the internally stored bit string and makes it an empty string upon receiving the data clear signal. It should be noted that in the conversion operation, if the last bit string of the input data is less than 6 or 7 bits, the missing part trO11 is added, but the "Ol" added here is
+ is.

It is subject to the above clearing.

As a result of the above processing, the 8-bit data string (7D)
,,(32),,(77)□,(20)1. Input data: 12 is an 8-bit data string (05), , (9
0)ts(88)16 and becomes the same as the original data, data i in FIG. 2(a).

If it is inferior to the above embodiment, an 8-bit data string in the range of (00)□6 to (F F)□6 can be converted to
(20) 1. Using a unified method of adding 1 bit or 2 bits per 8 bits according to the two patterns of tt and "1". Since it can be converted into an 8-bit data string in the range of 1G to (7F), the processing device is simplified and the processing efficiency is improved.

The above description has been made regarding the embodiment corresponding to the invention set forth in claim 1, but the same applies to the invention set forth in claim 2. In both cases, the big advantage is that the degree of data expansion is 1
．． The transfer efficiency can be suppressed to a low value of 14 (8/7) to 1.33 (8/6) times, resulting in good transfer efficiency.

Further, it goes without saying that each of the means shown in the above embodiments may be configured by hardware or may be realized by microprocessor control using software.

〔Effect of the invention〕

As described in detail above, according to the present invention, in a character string conversion method that converts an arbitrary 8-bit data string into an 8-bit data string within a range excluding control characters, the value of the first bit is looked at and 6 A first step of cutting out bit data or 7-bit data, and bit 110071 or bit II O1 at the beginning of the 6-bit data or 7-bit data.
1, it is suitable for application when the information processing system intervening during the communication does not support the transparent mode, and
This has the remarkable effect of realizing a character string conversion method that can shorten transmission time and reduce storage capacity.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1(a) and 1(b) are block diagrams showing the configurations of a converting device and an inverse converting device according to an embodiment of the present invention, and FIG.
Figures (a) and (b) are diagrams illustrating the conversion operation by the conversion device of this embodiment and the inverse conversion operation by the inverse conversion device, respectively.
FIG. 3 is a diagram of conventional character data showing the range of data that can be transmitted. 11: Input data, 12: Visi 1 to column cutting section, 13:
Pi 1 to row inversion part, 14: Bit 00'' insertion part, 15
: Bit 110 II insertion section, 16: 8-bit data output section, 17: Output data, 21: Input data, 22: Redundant bit removal section, 23: Bit string inversion section, 24: Bit number adjustment section, 25: 8-bit data Output section, 26: Output data. Figure 1 (a) Figure 1 (b)

Claims (2)

[Claims] (1) In a character string conversion method that converts an arbitrary 8-bit data string to an 8-bit data string within the range excluding control characters, if the first bit is “1”, 6-bit data is cut out and the first bit is “0”. ”, the process of cutting out 7-bit data and the bit “00” at the beginning of the 6-bit data.
”, the 7-bit data is inverted, and a bit “0” is inserted at the beginning of the 7-bit data. (2) In a character string conversion method that converts an arbitrary 8-bit data string to an 8-bit data string within the range excluding control characters, if the first bit is “0”, 6-bit data is cut out and the first bit is “1”. ”, the process of cutting out 7-bit data, inverting the 6-bit data, inserting a bit “00” at the beginning of it, and inserting a bit “0” at the beginning of the 7-bit data. A string conversion method that consists of a processing process.