Abstract: A help guidance method utilizing an animated picture, used for an information processor including a memory for storing a help control program for controlling help guidance, animated picture help data, text help data and voice help data used for carrying out the help guidance, and a table for showing the correspondence relationship among the animated picture help data, the text help data and the voice help data.

Abstract: A half tone display apparatus using a display apparatus of bilevel representation in white and black is provided. The apparatus includes a unit supplied with a multilevel image such as a color image, a device for detecting edges in characters, patterns and photographic images, a unit for deriving a level difference between pixels adjacent to the edge, and a control unit for forcibly displaying a pixel of the edge portion as a white or black pixel for emphasis provided that the level difference is not larger than a predetermined threshold and for applying dither conversion to other pixels.

Abstract: A display system calculates the value of luminance of a screen of a display unit for each display frame and dynamically controls the luminance of the display screen on the basis of the calculated luminance value while taking the surrounding brightness, thereby providing a display appearance easiest to see.

Abstract: In a floating point digital differential analyzer, multiplication and division of constants are carried out by an adder which truncates a summation SDY.sub.i of l secondary increments calculated by ##EQU1## into a third increment having an n-bit mantissa including a sign bit, and an integrator for carrying out an integration ofR.sub.i :=R.sub.i-1 +Y.sub.i .multidot..DELTA.X.sub.i -.DELTA.Z.sub.iirrespective of a value of a first increment .DELTA.X.sub.i to generate .DELTA.Z.sub.i from R.sub.i.

Abstract: In order to deliver an input signal of each operation cycle after a desired time delay, there are disposed data memory means for storing the input signal, counter means for appointing write addresses of the data memory means, and address memory means for appointing read addresses of the data memory means. The address memory means is divided into partial memory areas equal in number to time delay elements, whereupon while sampling the input signal at a predetermined sampling period and changing the count value of the counter means one by one for each of the desired time delay elements at each sampling point, the variations of the input signal in a sampling interval between the particular sampling point and the adjacent sampling point are successively written into the memory means.

Abstract: A method of operation of a digital differential analyzer for performing the operation: ##EQU1## where Y is an integrand, .DELTA.Y is an increment of an input variable, R is a residue of the integrated value of the integrand, .DELTA.X is an increment of an independent variable, .DELTA.Z is an output increment of the integrated value of the integrand, K is a constant and n is an input number (a positive integer), in the ith iteration, uses a first mantissa M.sub.1, a second mantissa M.sub.2, a first exponent E.sub.1 and a second exponent E.sub.2 for expressing the abovementioned equation as follows, ##EQU2## then adjusts the radix points of the first and second mantissae in the bit number corresponding to the difference between the first and second exponents to adjust the mantissa portion to the greater exponent of the two, and thereafter calculates the mantissa portion to perform the abovementioned arithmetical operation and to obtain .DELTA.Z and R; the improvement wherein the mantissa portion of .DELTA.

Abstract: A figure displaying device operates to display a plurality of fundamental figures each defined by a preset number of vectors on a display device of the raster scanning type. The figure displaying device stores the start and end point coordinates of the respective vectors of the respective fundamental figures and the gradient data of the respective vectors of the fundamental figures, and determines whether the respective vectors are located on a horizontal scanning line or not for each fundamental figure prior to the scanning operation of the horizontal scanning line. If the vectors are located on the horizontal scanning line the gradient data corresponding to the vectors on the aforementioned horizontal scanning line is read out and added to the start point coordinates thereby to renew the start point coordinates.

Abstract: A colored display system for displaying a plurality of colored solid surfaces each of which is obtained by coloring or painting in a region, comprising circuit means for generating figure information signals representative of the respective solid surfaces, a priority circuit for selecting one of the figure information signals in response to a predetermined priority order when the figure information signals are simultaneously generated, a memory circuit for storing color information, circuit means for reading out the color information corresponding to the selected figure information signal from the memory circuit and a color cathode ray tube for displaying the colored solid surfaces in response to the color information read out.

Abstract: A digital differential analyzer comprises an arithmetic unit for performing an integration operation, a control unit for controlling the arithmetic unit, a plurality of temporary storage means in the arithmetic unit for temporarily storing interim results of the arithmetic operation therein to relieve the influence of propagation delay time of the arithmetic unit.