公开(公告)号：IT1141163B

公开(公告)日：1986-10-01

申请号：IT1971380

申请日：1980-02-05

Applicant: RCA CORP

Inventor： BALABAN ALVIN REUBEN ,  STECKLER STEVEN ALAN

IPC: H03B5/00 ,  H03B5/12 ,  H03L7/099 ,  H03B

Abstract: A variable-frequency oscillator includes an oscillator portion coupled to a phase shifter and a controllable gain device for controlling the amount of phase-shifted signal reintroduced to the oscillator. The oscillator includes first and second transistors coupled at their emitters to a current source. The emitters of third and fourth transistors are coupled to bases of the first and second transistors, respectively. The base of the third transistor is coupled to a voltage source, and the base of the fourth transistor couples to the collector of the first to form a regenerative loop capable of oscillation. A parallel-resonant circuit is coupled between the collector of the first transistor and the voltage source for establishing a frequency-sensitive phase characteristic in the loop by which the quiescent frequency is determined. The phase shifter is coupled to a point on the regenerative loop. The controllable gain device is coupled to the output of the phase shifter and reinjects a variable-amplitude version of the phase-shifted signal to a second point on the loop for establishing the oscillation frequency.

公开(公告)号：IT1134662B

公开(公告)日：1986-08-13

申请号：IT2655380

申请日：1980-12-10

Applicant: RCA CORP

Inventor： BALABAN ALVIN REUBEN ,  STECKLER STEVEN ALAN

IPC: H03K3/023 ,  H03K5/04 ,  H03K3/53 ,  H03K4/64 ,  H03K4/94 ,  H04N5/06 ,  H04N

Abstract: A pulse generator is provided which may be advantageously used to produce a deflection drive signal in a television receiver. A capacitor is initially charged to a reference voltage level. Prior to the time at which the output pulse is to be generated, the capacitor is charged from a current source for a known time duration at a first rate. At the end of the charging interval, the capacitor has accumulated a known increment of charge proportional to the charge interval, and a new voltage level is established across the capacitor. The generator is now prepared to produce an output pulse. At a subsequent time, when the output pulse is needed, the capacitor is discharged at a second rate by a second current source. During the time interval that the second current source is discharging the capacitor, an output pulse is produced by the generator. A sensing circuit monitors the charge condition of the capacitor, and when it detects that the capacitor has been discharged to the initial reference voltage level, the sensing circuit disconnects the discharging current source from the capacitor, thereby terminating the output pulse.

公开(公告)号：FI71049B

公开(公告)日：1986-07-18

申请号：FI793025

申请日：1979-09-28

Applicant: RCA CORP

Inventor： BALABAN ALVIN REUBEN ,  STECKLER STEVEN ALAN

IPC: H04N5/12 ,  H04N5/04

公开(公告)号：GB2115629B

公开(公告)日：1986-06-25

申请号：GB8303911

申请日：1983-02-11

Applicant: RCA CORP

Inventor： STECKLER STEVEN ALAN ,  BALABAN REUBEN

IPC: H04N5/20 ,  H03G3/20 ,  H04B3/06 ,  H04N5/52

Abstract: An automatic gain control arrangement is provided for an analog to digital (A/D) converter in a television signal processing system. A gain-controlled source of analog signals applies a video information signal to the input of an A/D converter. The A/D converter produces digitized video signal samples at an output which is coupled to a digital peak detector. The digital peak detector detects the level of the digital samples of the synchronizing signal components. The detected sync signal level is compared with a desired value or range of values. If the detected sync signal level is not at the desired level or is outside the desired range, the count of a counter is incremented or decremented accordingly. The count of the counter is converted to an analog voltage which is applied to the gain-controlled signal source to control the level of the analog signal applied to the A/D converter. The analog voltage may also be combined with a control voltage produced by an analog peak detector, which detects the level of the input signal to the A/D converter, to produce a composite gain control signal.

公开(公告)号：FI69946C

公开(公告)日：1986-05-26

申请号：FI801504

申请日：1980-05-09

Applicant: RCA CORP

Inventor： STECKLER STEVEN ALAN ,  BALABAN ALVIN REUBEN

IPC: H04N5/12 ,  H04N5/05

Abstract: A television horizontal AFPC loop includes a filter, the time constant of which can be switched at the vertical rate for improved operation from standard broadcast signals and from video tape recorders. A transistor switch introduces a voltage offset which perturbs the AFPC filtered oscillator control voltage. The perturbation is reduced by introducing a second offset voltage for reducing the perturbation and improving the synchronization of the oscillator with the synchronizing signals.

公开(公告)号：GB2130839B

公开(公告)日：1986-05-08

申请号：GB8331138

申请日：1983-11-22

Applicant: RCA CORP

Inventor： BALABAN ALVIN REUBEN ,  STECKLER STEVEN ALAN

IPC: H04N7/26 ,  H04N9/64 ,  H04N11/04 ,  H04N5/48

Abstract: A digital television receiver includes an analog-to-digital converter having a controllable scaling factor and offset. To improve resolution of the digital samples, the scaling factor is increased and the offset is changed when the synchronizing and color reference burst portions of the composite video signal are being converted. In addition, the scaling can be greatly increased at selected times so that the phase of the color reference burst can be more accurately determined.

公开(公告)号：FR2568434A1

公开(公告)日：1986-01-31

申请号：FR8512233

申请日：1985-08-09

Applicant: RCA CORP

Inventor： STECKLER STEVEN ALAN ,  BALABAN ALVIN REUBEN

IPC: H04N5/05 ,  H04N5/12 ,  H04N5/44

Abstract: The automatic frequency and phase regulating loop for control of the horizontal frequency of a television receiver is designed such that the loop gain is periodically increased during the vertical scan cycle in order to compensate for errors. A phase detector (30) is coupled to a loop filter (50) over a resistor (431) that fixes the output impedance. The filtered output controls an oscillator (460) to generate the horizontal line frequency and also closes the feedback loop by connecting with the phase detector (30). The isolated signal from the synchronisation stage (16) is coupled to the phase detector. The line scan frequency is processed by the horizontal deflection control stage.

公开(公告)号：MY8500737A

公开(公告)日：1985-12-31

申请号：MY8500737

申请日：1985-12-30

Applicant: RCA CORP

Inventor： BALABAN ALVIN REUBEN ,  STECKLER STEVEN ALAN

IPC: H04N3/16 ,  H04N3/185 ,  H04N5/06 ,  H04N5/12 ,  H03L7/08 ,  H04N3/18

Abstract: A television horizontal deflection system and a switched-mode power supply are provided which share a single sawtooth waveform generator for the generation of delayed deflection signals and delayed power supply gating signals, respectively. The sawtooth waveform generator has an input coupled to receive pulses which are maintained in phase and frequency synchronism with the sync pulses of the video signal. The sawtooth waveform is applied to a comparator in the horizontal deflection system where it is compared with a D.C. voltage resulting from the phase comparison of the sync and flyback pulses to determine the time of delayed generation of the succeeding horizontal deflection signals. The sawtooth waveform is also applied to a comparator in the power supply to determine the time of delayed generation of the succeeding gating signals for the SCR or like device. By selecting a time constant for the phase adjustment between sync and flyback in the deflection system which is smaller (i.e., faster) than the time constant of the regulated supply, the phase differences between sync and flyback are so quickly compensated for by the deflection system that their effects on the regulated supply are minimized.

公开(公告)号：FR2536620A1

公开(公告)日：1984-05-25

申请号：FR8318590

申请日：1983-11-22

Applicant: RCA CORP

Inventor： BALABAN ALVIN REUBEN ,  STECKLER STEVEN ALAN

IPC: H04N7/26 ,  H04N9/64 ,  H04N11/04 ,  H04N9/34

Abstract: A digital television receiver includes an analog-to-digital converter having a controllable scaling factor and offset. To improve resolution of the digital samples, the scaling factor is increased and the offset is changed when the synchronizing and color reference burst portions of the composite video signal are being converted. In addition, the scaling can be greatly increased at selected times so that the phase of the color reference burst can be more accurately determined.

公开(公告)号：ZA831145B

公开(公告)日：1984-04-25

申请号：ZA831145

申请日：1983-02-21

Applicant: RCA CORP

Inventor： STECKLER STEVEN ALAN ,  ALVIN REUBEN BALABAN

IPC: H04N5/44 ,  H04N5/455 ,  H04N9/00 ,  H04N9/64 ,  H04N ,  H03K

Abstract: An analog carrier signal and its sidebands contain modulated information which is to be digitally encoded and processed. Demodulation and digital encoding is accomplished in a single process by an analog-to-digital converter, which samples the analog signals in response to a sampling signal of a frequency which is at least twice the bandwidth of the band of frequencies containing the carrier signal and its information-bearing sidebands. The analog signal samples are digitally encoded, producing a band of digital information signals corresponding to baseband signal components. When used in a television receiver to produce digital signal samples, the band of analog signals may include both sound and picture carriers and their audio and video information. By controlling the phase and frequency of the analog carrier signal in relation to the color subcarrier signal, and deriving the sampling signal from the analog carrier, an ease in video signal demodulation is provided.