Showing papers on "Residual frame published in 1980"

PCM Recording and reproducing apparatus

Abstract: When error detection codes are added to a sampled signal word which is a digital version of audio information and a control signal which is a digital version of system control information to construct a data frame and a control signal frame, respectively, the error detection code for the data frame is generated under an arithmetic condition different from that for the control signal frame. In this manner, frame identification information is superimposed on the error detection codes. In a reproducing unit, the error detection codes containing the identification information are used to check an error in the reproduced sampled signal word and control signal and to effect the discrimination between the data frame and the control signal frame.

Dynamic scan-converted images with a frame buffer display device

Abstract: A color interactive display system which produces images of three-dimensional polygons and labels on a frame buffer display device is being developed. The entire image is scan converted and written into the frame buffer whenever it is modified. Since an entire image cannot be written into the frame buffer faster than 4.6 frames per second for the particular device chosen, an illusion of continuous motion cannot be supported. However, a rate of 3 frames per second has been found sufficient to provide feedback to continuous user input.In order to achieve this frame rate for a reasonably complex picture, the display device has been microprogrammed to accept run length encoded data and text, and the instruction set of the computer has been extended by microprogramming special-purpose instructions which perform visible surface calculations. These microprograms currently can process a scene which consists of up to 170 polygons at 3 frames per second.

Error fault recovery and control system

Abstract: PURPOSE:To prevent the effect of a transmission error, by discontinuing the inter- frame decoding if the error of transmission is detected and outputting the contents of the frame in front of a frame memory in the form of video signals. CONSTITUTION:Usually the signal received at a receiving part 7 is decoded by a decoding circuit 8 and added with the contents of a front frame that is stored in a frame memory 10 through an adding circuit 9 to be turned into an output video signal. When an error of transmission is detected, the contents of the front frame stored in the memory 10 is delivered as it is via the circuit 9 to discontinue the inter- frame decoding. Then the line number of a refresh mode is stored in a line number memory 12, and at the same time rewriting the memory 10. After this, the inter- frame decoding is carried out when the line number stored in the memory 12 is received.