Abstract: Lines or sections of lines on a scanned CRT display are checked to determine whether a moire pattern exists. The existence is determined by comparing the number of pixels occurring on a line or a section of a line to a reference count corresponding to a moire pattern. Substantial equality of the pixel count and the reference count enables a moire correction circuit for the section of the display containing the moire pattern. In sections of the display where the moire pattern does not occur, i.e., the pixel count and the reference count are not substantially equal, the moire correction circuit is automatically disabled.

Abstract: Apparatus and method for converting an analog input signal to a digital signal by modulating the analog signal with a periodic triangular wave-shape signal to produce intermediate digital signals and Exclusive-ORing these intermediate signals with a square wave signal having the same phase as the triangular wave-shape signal.

Abstract: Apparatus and method for selectively multiplying or dividing operands by combined add-shift right operations or subtract-shift left operations, the latter preceded and followed by a pre-shift to the left and post-shift to the right. An array of register stages, including an adder, is arranged to shift the register contents and adder output signals selectively right or left, depending on the operation and the value of the least significant bit of the controlling operand. The loading of operands and retrieval of results can be accomplished as if the unit were a memory device, making it especially useful for small computers and microprocessors. The array is structured to permit cascading identical units in a regular manner to handle operands of any desired length. Any unit can be the left most, right most, or intermediate unit when cascaded.

Abstract: Circuit for electrically recording digital data by identifying the beginning of each cell boundary with a pulse and recording an intercell transition for one binary value and no transition for the other binary value.

Abstract: An electromagnetic transducer in the form of a single wire shaped as a one-turn helix records a signal pattern on a web of magnetic material. The portion of the web including the recorded signal pattern thereafter passes opposite a magnetic fluid layer to provide an optical display.

Abstract: Circuit and method for converting FSK recorded data to NRZ by measuring time intervals between signals transitions of the same polarity.

Abstract: Circuit and method for electrically recording digital data by identifying the beginning of each cell boundary with a pulse and recording an intercell transition for one binary value and no transition for the other binary value.