Excavating
Patent
1980-07-25
1982-11-23
Atkinson, Charles E.
Excavating
364570, 364745, G06F 314
Patent
active
043609147
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for transferring information representing a plurality of parameters which are each defined by a plurality of measureable states of an arbitrary type, the parameter value being a measure of the state. The invention will be explained below substantially with respect to the case where there are two parameters which define their respective coordinates in a two-dimensional system of co-ordinates. If the system of co-ordinates e.g. belongs to a display, a great number of associated parameter values may define an image matrix used for optical reading of e.g. alphanumeric characters.
The resolubility of the parameters depends upon the number of digits each parameter contains in a given system of notation. As the time of information transfer is proportional to the total number of digits it will be appreciated that a known serial transfer of all the parameter digits will take an unnecessary long time if, in a given case, a significantly lower resolubility will suffice, e.g. for representing an image of a number, than is needed to represent a more complicated pattern.
The object of the invention is to provide a process for transferring information from two or more data sources, in which the information is serially transferred in data groups each of which contains a single bit from each data source, said process permitting a variable resolubility to be achieved in a very simple manner so that the transfer of information may be adapted in particular to rate of transfer and sensivitity to noise, depending upon the necessary and sufficient resolubility.
This object is achieved by arranging each data source so as to represent a parameter, such as a co-ordinate in a system of co-ordinates, so that the weight of each digit in a parameter represents a predetermined digit position in the corresponding data source and by interrupting the transfer of the row of digits thus produced when the transferred partial row represents each parameter with a predetermined accuracy. By combining the features of a front portion of the digit row representing with reduced resolubility all the parameters and of interrupting the transfer of the row, as stated, the resolubility and transmission time can be varied according to the number of digits in sequence which are included in the transfer of information.
As the weight of the digits in said row of digits thus gradually decreases, it is expedient to have the digit of the greatest weight, which originates from the most important parameter to be transferred, in the front of the sequence.
As according to the invention the digits are arranged in groups of uniform weight, there will be empty places in the sequence of the digits if only one of the parameters contains fewer digits than the other parameters. These empty places may advantageously be used for digits for error detection or flag characters.
The invention is not restricted to a specific system of notation since each digit may be represented by an electric voltage having a plurality of discrete voltage levels corresponding to the radix of the system of notation. Owing to modern technology developed for binary information, the invention is preferably carried out in the binary system of notation.
The invention also relates to an apparatus for carrying out the process. The apparatus is characterized by the coupling of registers, which in connection with said buffer register provides simple means for dynamic variation of resolubility, the buffer register being arranged to transfer its information to the main register when the plurality of digits necessary for the desired resolubility has been read from the lastmentioned register in the sequence, the remaining portion of the digits in the digit row being erased by parallel transfer of the information in the buffer register to the main register.
In addition to the examples already mentioned, the invention is a great value in many other applications. For process monitoring e.g., the invention allows a large number of parameters to be monitored rapidly in successio
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A. G. Franco, Coding For Error-Free Communications, Electro-Technology, Jan. 1968, pp. 53-62.
Atkinson Charles E.
Forsvarets Forskningstjeneste
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