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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.
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公开(公告)号：KR800001338B1
公开(公告)日：1980-10-28
申请号：KR760003010
申请日：1976-12-06
Applicant: RCA CORP
IPC: H03L5/02
Abstract: A biasing circuit biases the second of two input terminals of a differential amplifier at a first reference level. A bilevel voltage generated at an output terminal of the differential amplifier shifts levels when the sawtooth voltage equals the first reference voltage level. A second biasing circuit coupled to the first input terminal biases the first input terminal at a second reference voltage level differing from the 1st reference level by an offset voltage. The second reference level is selected to equalize the duration of each of the bilevel voltages.
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公开(公告)号：NZ188494A
公开(公告)日：1982-08-17
申请号：NZ18849478
申请日：1978-09-25
Applicant: RCA CORP
Inventor： HARWOOD L , GROENEWEG W , TUMA A
Abstract: In a PAL color television system for processing a color signal including burst and chrominance components alternating in phase at the image line scanning rate, identification and control circuitry for rapidly correcting an incorrect mode of line to line color demodulator switching. A bistable circuit generates timing signals for controlling line by line switching of a selected color demodulator (e.g., R-Y). An identification signal representative of an incorrect line switching mode is derived from information contained in the burst component, and serves to reset the bistable circuit such that timing signals corresponding to a correct switching mode are produced. The identification signal is derived by a filter circuit exhibiting a fast response time relative to the line scanning time, in order to rapidly respond to the switching mode identification information occurring at the line rate and thereby rapidly restore the correct demodulator switching mode.
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公开(公告)号：ZA78530B
公开(公告)日：1979-09-26
申请号：ZA78530
申请日：1978-09-19
Inventor： MARTIN M , HARWOOD L , GROENEWEG W , TUMA A
IPC: B65G60/00 , H04N20060101 , H04N
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Patent Agency Ranking
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公开(公告)号：ZA7800530B
公开(公告)日：1979-09-26
申请号：ZA7800530
申请日：1978-09-19
Inventor： MARTIN M , HARWOOD L , GROENEWEG W , TUMA A
IPC: B65G60/00 , H04N20060101 , H04N
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公开(公告)号：NZ187161A
公开(公告)日：1982-03-16
申请号：NZ18716178
申请日：1978-05-03
Applicant: RCA CORP
Inventor： TUMA A , GROENEWEG W , HARWOOD L
IPC: H04N5/59
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公开(公告)号：BR7806236A
公开(公告)日：1979-05-08
申请号：BR7806236
申请日：1978-09-22
Applicant: RCA CORP
Inventor： HARWOOD L , GROENEWEG W , TUMA A
Abstract: In a PAL color television system for processing a color signal including burst and chrominance components alternating in phase at the image line scanning rate, identification and control circuitry for rapidly correcting an incorrect mode of line to line color demodulator switching. A bistable circuit generates timing signals for controlling line by line switching of a selected color demodulator (e.g., R-Y). An identification signal representative of an incorrect line switching mode is derived from information contained in the burst component, and serves to reset the bistable circuit such that timing signals corresponding to a correct switching mode are produced. The identification signal is derived by a filter circuit exhibiting a fast response time relative to the line scanning time, in order to rapidly respond to the switching mode identification information occurring at the line rate and thereby rapidly restore the correct demodulator switching mode.
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