公开(公告)号：KR820002356B1

公开(公告)日：1982-12-23

申请号：KR790000603

申请日：1979-02-27

Applicant: RCA CORP

Inventor： RUTISHAUSER E

IPC: H04N5/14

Abstract: A protection circuit for limiting the power dissipation of a video output amplifier when high frequency signals of significant magnitude and with a high density of occurrence(e.g.,noise during vacant channel reception) are supplied to the amplifier. The protection circuit includes a control transistor and a sensing network. The sensing network monitors a video signal coupling path to detect the presence of high frequency signals, and derives a voltage representative thereof. The derived voltage is insufficient to render the control transistor operative under normal signal conditions.

公开(公告)号：KR820001090B1

公开(公告)日：1982-06-21

申请号：KR780000180

申请日：1978-01-24

Applicant: RCA CORP

Inventor： PEER J ,  LUZ D

IPC: H04N3/22

Abstract: A circuit to regulate the television track width comprises a first means of negative feedback (40, 54) coupled to a means of variable impedance which comprises a reactive variable impedance coupled to a shunt circuit which draws a charge current from it. The first negative feedback (40, 54) reacts to the charge current to produce a first negative feedback voltage. This voltage increases the value of the reactive impedance when the charge current increases to maintain an appreciably constant track width. The reactive impedance (45, 46, 47) comprises a driven commutator, whose conduction time varies in response to the first negative feedback voltage.

公开(公告)号：KR820000873B1

公开(公告)日：1982-05-17

申请号：KR770001830

申请日：1977-08-08

Applicant: RCA CORP

Inventor： RUTISHAUSE E ,  CARMT P ,  SCHIESS J

IPC: H04N9/02

Abstract: The color video information signal source (1a, 1b) including the modulation circuit network (3a, 3b, 3c, 4a) of providing modulated negative carrier wave signal of the first phase (R-Y) and the second phase (B-Y), the first output terminal (Y) providing luminance component of prescribed frequency band width, the signal combination circuit (5C) connected to the first and the second output terminal, the signal record (10) connected to the output of the frequency modulator are included in the video disc systems. The characteristic of the systems is the burst-pulse generating circuit (26).

公开(公告)号：KR820000746B1

公开(公告)日：1982-05-03

申请号：KR780000350

申请日：1978-02-11

Applicant: RCA CORP

Inventor： PEER J

IPC: H04N3/16

Abstract: The horizontal deflection cct. of a color TV receiver includes a horizontal output transformer(42) with a secondary winding across which a voltage is developed and includes a horizontal deflection winding(41) coupled to a pincushion correction winding of a pincushion reactor. In response to the current flowing in the vertical deflection winding(26), the inductance of the pincushion correction winding varies in a manner providing for East-west pincushion distortion correction. For setup in the service mode of operation, the vertical deflection cct.(40) is disabled.

公开(公告)号：KR810001902B1

公开(公告)日：1981-11-20

申请号：KR780001753

申请日：1978-06-09

Applicant: RCA CORP

Inventor： GROENEWEG W ,  HARWOOD L ,  TUMA A

IPC: H04N5/58

Abstract: An average beam current limiter for a kinescope responsive to video signals coupled via a signal transmission channel(STC) comprises a source of control signals representative of average current drawn by the kinescope. When average beam current exceeds a predetd. threshold level by an amt. within a first range beam current, a corresponding control signal is coupled to the STC to vary the DC content of the video signal in a direction to limit beam current above the threshold level within the first range. When beam current exceeds the threshold level by a relatively greater amt. within a second range of current, a corresponding control signal serves to current within the second range.

公开(公告)号：KR810000727B1

公开(公告)日：1981-06-25

申请号：KR770002832

申请日：1977-12-06

Applicant: RCA CORP

Inventor： FOX L ,  DIXON F ,  TRACHMAN E

IPC: G11B15/58

Abstract: An apparatus for removing dust particles from high density information record in which wear on both the record groove and the dust particle removing apparatus is provided with cover brush. The demensions of an information track contained in a groove in the storage medium vary in accordance with recorded information. The cover brushs are provided for lightly contacting the record groove surface to dislodge the dust particles without sweeping them off.

公开(公告)号：KR800001107B1

公开(公告)日：1980-10-08

申请号：KR740002506

申请日：1974-05-29

Applicant: RCA CORP

Inventor： WHEATLEY C

IPC: H03F3/04

Abstract: Amplifier suitable for use in an audio-power amplifier to prevent over-dissipation of an output transistor includes PNP composite transistors(41-44) connected as common-emitter amplifiers comprising a PNP preamplifier transistor in direct coupled cascade with a plurality of paralleled NPN transistors. The emitter electrode of the PNP transistor is connected to a sensing resistor in the collector path of these NPN transistors, causing the base-to-emitter potential of the composite transistors if its emitter current exceeds a threshold current. By clamping this VBE if it exceeds a predetd. potential, the output transistor is protected.

公开(公告)号：KR800001022B1

公开(公告)日：1980-09-22

申请号：KR760002871

申请日：1976-11-18

Applicant: RCA CORP

Inventor： HARWOOD L

IPC: H04N9/46

Abstract: An oscillator suitable for construction in integrated cct. form is composed of an oscillation amplifier(60) with an input(9) and output(8), a reactive filter network(63) having a predetermined resonant frequency coupled in a closed loop between the input and output of the amplifier, a phase shift network(80) coupled to the output for phase shifting the oscillatory signal, a source of control signal representative of the frequency or phase of the oscillatory signal with respect to the burst component and a combining network(69) coupled to the oscillation amplifier.

公开(公告)号：KR800001018B1

公开(公告)日：1980-09-22

申请号：KR760000590

申请日：1976-03-10

Applicant: RCA CORP

Inventor： BAKER A

IPC: H04N5/76

Abstract: A defect detector suitable for use in playback of a video record employing an FM carrier recording format is composed of a zero-crossing detector(20) for developing output pulses indicative of the zero-crossing of the signal developed by the pick up ccts., a monostable multivibrator(25) responsive to the output pulses of the zero-crossing detector, a low pass filter(27) coupled to receive an output of the multivibrator, means for utilizing the output of the low pass filter to control the display of images and means(68) for developing a delayed version of an output pulse of the multivibrator.

公开(公告)号：KR800000936B1

公开(公告)日：1980-09-12

申请号：KR760001141

申请日：1976-05-10

Applicant: RCA CORP

Inventor： NORMAN M

IPC: H04N9/52

Abstract: A limiter for limiting the electron beam current induced by an image reproducing kinescope is composed of means for driving a control voltage representing the magnitude of current induced by the kinescope from the high voltage supplying device, amplfying means for combining the luminance signals and chrominance signals to drive color signals and clamping means copuled to the amplifying means for clamping a predetd. cct. point of the amplifying means to the control voltage to control the operating point of the amplifying means.