公开(公告)号：US3883686A

公开(公告)日：1975-05-13

申请号：US39940073

申请日：1973-09-20

Applicant: ERICSSON TELEFON AB L M

Inventor： JACOBAEUS ANTON CHRISTIAN ,  WERN LARS AKE

IPC: H04N7/26 ,  H04N1/38

CPC classification number: H04N19/00

Abstract: The invention relates to a method and a device for reducing the effect of a loss of information during transmission at compressed band width, particularly during transmission at compressed band width of a PCM-signal. Each of the serially generated PCM-words indicates the light intensity in picture elements that are serially scanned in a TV-frame, the number of transmitted PCMwords in each TV-frame being less than the number of generated PCM-words. According to the invention the effect of the loss of picture information is reduced in such a manner that when band width comprsssion is made TV-line by TV-line the loss will alternately occur on the left and right edges of the TV-lines on the screen viewed downwards in consecutive order and when band width compression is made TV-field by TV-field the loss will alternately occur on the upper and lower edges of the screen, the loss of picture information only appearing as a lesser degree of resolution along the respective edges of the screen.

Abstract translation: 本发明涉及一种用于在压缩带宽的传输过程中减少信息丢失的影响的方法和装置，特别是在PCM信号的压缩带宽传输期间。 串行生成的PCM字中的每一个表示在TV帧中串行扫描的像素中的光强度，每个TV帧中发送的PCM字的数量小于生成的PCM字的数量。 根据本发明，减少图像信息丢失的效果，使得当通过TV线使带宽压缩成为TV线时，丢失将交替发生在TV线的左侧和右边缘上 屏幕以连续顺序向下观看，当通过电视场进行带宽压缩时，屏幕的上下边缘将交替出现损失，图像信息的丢失仅沿着屏幕的较小程度出现 屏幕的各个边缘。