公开(公告)号：KR790001722B1

公开(公告)日：1979-12-14

申请号：KR740003293

申请日：1974-08-07

Applicant: RCA CORP

Inventor： HOPKINS JR R ,  MILLER D

IPC: H04M11/00

Abstract: A sample pulse generating apparatus was composed of, a circuit suppling for a predetermined frequency pulse fow, a circuit responding to the pulse row to supply a first pulse with repetition ration ratio determined by anumber of row and column, acircuit responding to the first pulse supplying a second puls with reduced repetition ratio to be matched to a bandwidth characteristics, and a logic circuit composed of a group of flip- ! flop and a pulse calculator generating the sample pulse.

公开(公告)号：US3721923A

公开(公告)日：1973-03-20

申请号：US3721923D

申请日：1971-08-06

Applicant: RCA CORP

Inventor： GRAY S ,  LEVIN B ,  MILLER D

IPC: H01P1/18

CPC classification number: H01P1/182

Abstract: A slab of semiconductive material is positioned inside a rectangular waveguide transmission line to electrically change the phase shift within a waveguide. The slab is provided with two electrodes to which a D.C. bias signal is applied; the bias signal varies the conductivity of the semiconductor material to produce the desired phase shift by changing the effective dimensions of the waveguide.

Abstract translation: 半导体材料板被放置在矩形波导传输线内部以电变化波导内的相移。 平板设置有施加直流偏置信号的两个电极; 偏置信号通过改变波导的有效尺寸来改变半导体材料的导电性以产生期望的相移。

公开(公告)号：US3843837A

公开(公告)日：1974-10-22

申请号：US38734673

申请日：1973-08-10

Applicant: RCA CORP

Inventor： HOPKINS R ,  MILLER D

IPC: H04N7/12 ,  H04N5/00

CPC classification number: H04N7/125

Abstract: A frame of stored video information may be considered to comprise a matrix of columns and rows. Correct transmission of this information requires that the sampling of the video elements, column-by-column and row-by-row, be precisely carried out. Two constructions are herein described as employing digital techniques in order to sequentially transmit the information elements along a voice-grade telephone line to be reproduced in a picture display.

公开(公告)号：BR7406397D0

公开(公告)日：1975-05-27

申请号：BR639774

申请日：1974-08-05

Applicant: RCA CORP

Inventor： HOPKINS R ,  MILLER D

IPC: H04N7/12 ,  H04M11/08 ,  H04H1/08

Abstract: 1475352 Television RCA CORPORATION 31 July 1974 [10 Aug 1973] 33690/74 Heading H4F In a television image transmission system of the type described in Specification 1,393,674 in which a video signal frame is stored and then sampled column-by-column and row-by-row at such a rate that transmission of the video signal samples over an audio link is possible, the sampling is effected by gating pulses derived from an 8 MHz clock 14 the pulse train from which is divided by 512 (i.e. the number of columns of elements into which the frame is divided), then by 525 (i.e. the number of rows of elements within each column), and then by 8 in order to match the sampling rate to the bandwidth characteristics of the audio link. The resulting pulses from divider 22 and the pulse train from clock 14 are fed to a flip-flop 24 the output of which controls an AND gate 28 to pass the pulse train from clock 14 to a counter 10 which derives therefrom the gating pulses. Flip-flop 24 is initially set to condition AND gate 28 to pass the clock pulse train to counter 10, and is reset to its other state when an output signal is developed by divider 22 corresponding to the end of the counting of all rows in the first column. Thus the reset clock pulse is inhibited by AND gate 28 from reaching counter 10, but at the same time this clock pulse sets flip-flop 24 to its initial set condition causing it to pass the following clock pulses i.e. the sampling is shifted from the first to the second column.