Computer graphics processing and selective visual display system – Computer graphics processing – Graph generating
Patent
1997-10-07
2000-02-01
Nguyen, Phu K.
Computer graphics processing and selective visual display system
Computer graphics processing
Graph generating
G06F 1500
Patent
active
060208961
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of signal processing application graphical entry, and in particular to a method of specifying characteristics of circuits for signal processing which calls upon graphical input.
2. Discussion of the Background
In the particular case of the design of integrated circuits for signal processing, there are software tools which are run on workstations and make it possible to define the units making up a chain and to specify their interconnections graphically. These tools are appropriate to a description of processing as pictured by data streams flowing between the units. In the case of signal processing chains, such as those implemented in multisensor detection systems, the data stream picture is inappropriate since the signal has a multidimensional structure. Such is the case for example if L sensors provide firstly the L rows of a matrix whose C columns subsequently feed C computations. Only by structuring the data into tables can this organization of the computations be specified without ambiguity.
Methods making it possible to embody signal processing circuits, in a relatively complex manner, are known from the documents WOA 9106060 (VLSI TECHNOLOGY), IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS SPEECH AND SIGNAL PROCESSING, Apr. 3-6, 1990, ALBUQUERQUE US, pages 1057-1060, XP000146955 GENIN ET AL: "dsp specification using the silage language" and IEEE INTERNATIONAL CONFERENCE ON COMPUTER-AIDED DESIGN, Nov. 11-14, 1991 SANTA CLARA US, pages 272-275, XXP000315186 VANHOOF ET AL: "compiling multidimensional data streams into distributed dsp asic memory".
SUMMARY OF THE INVENTION
The subject of the present invention is a method making it possible to specify signal processing chains especially for the purpose of designing signal processing circuits, but also for the purpose of producing software for existing signal processing machines and to do so regardless of the structure of the signal, be it single- or multidimensional.
The subject of the invention is a method allowing a user to specify digital signal processing chains by means of a graphics input and a digital computer with which there is associated a library containing a set of elementary transformations used in signal processing, characterized in that the user structures the data to be processed into at least one table displayed in the form of cartesian grids, the dimensions of each table corresponding to physical quantities, in that for each transformation he graphically compiles an operand application table and a result application table, and chooses from the library an elementary transformation together with its input array and output array, these arrays corresponding to the number of samples defining the elementary function, in that he matches, for each cartesian coordinate axis, at least two elements of the operand array and of the operand application table on the one hand, of the result array and of the result application table on the other hand, and in that the computer uses the affine relations characteristic of the accesses to the tables for signal processing in order completely to execute the transformation by iterating the elementary transformation as many times as necessary for the result table to be entirely filled with collections of points identical to the collection of points corresponding to the output array. matches between the tables and the arrays and the iterations for the filling of the tables are linear. These matches are equivalent to affine relations. Thus, by virtue of the invention, it is possible via a very simple sequence of operations, to specify very complex digital signal processing chains.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be better understood on reading the detailed description of an embodiment taken by way of non-limiting example and illustrated by the appended drawing in which:
FIG. 1 is a diagram illustrating the principle of graphical representation of a table,
FIG. 2 is a diagram illustrating
REFERENCES:
patent: 4542455 (1985-09-01), Demeure
patent: 4604736 (1986-08-01), Demeure
patent: 5831604 (1998-11-01), Gerber
Demeure Alain
Lafage Anne
"Thomson-CSF"
France Telecom
Nguyen Phu K.
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