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    TELEVISION RECEIVER TUNING DEVICE
    4.
    发明授权
    TELEVISION RECEIVER TUNING DEVICE 失效

    公开(公告)号：KR830000730B1

    公开(公告)日：1983-04-06

    申请号：KR780003267

    申请日：1978-10-30

    Applicant: RCA CORP

    Inventor： STECKLER STEVEN A ,  BALABAN ALVIN R

    IPC: H03J5/00

    Abstract: A receiver is tuned by a memory system which stores programming information to tune to different channels in sequence. Poor reception on a channel causes next choice to be selected. A receiver tuning system comprises a tuning element which responds to a voltage to alter tuning. A binary signal generator generates signals which represent tuning voltages which are then stored in a memory. A selector produced binary signals representing preferred and non preferred conditions which are stored in a second memory. Both memories are addressed by switching to select mode of operation and tuning sequence.

    DIGITAL AGC ARRANGEMENT
    5.
    发明专利
    DIGITAL AGC ARRANGEMENT 未知

    公开(公告)号：CA1195770A

    公开(公告)日：1985-10-22

    申请号：CA421562

    申请日：1983-02-14

    Applicant: RCA CORP

    Inventor： STECKLER STEVEN A ,  BALABAN ALVIN R

    IPC: H04N5/20 ,  H03G3/20 ,  H04B3/06 ,  H04N5/52 ,  H04N5/04

    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 less than twice the frequency of the highest frequency in the carrier and sidebands, but 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 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.

    TELEVISION HORIZONTAL AFPC WITH PHASE DETECTOR DRIVEN AT TWICE THE HORIZONTAL FREQUENCY
    6.
    发明专利
    TELEVISION HORIZONTAL AFPC WITH PHASE DETECTOR DRIVEN AT TWICE THE HORIZONTAL FREQUENCY 未知

    公开(公告)号：CA1143830A

    公开(公告)日：1983-03-29

    申请号：CA351682

    申请日：1980-05-09

    Applicant: RCA CORP

    Inventor： STECKLER STEVEN A ,  BALABAN ALVIN R

    IPC: H03L7/107 ,  H04N5/05 ,  H04N5/12 ,  H04N5/08

    Abstract: - 22 - RCA 73,476 An AFPC loop for a TV horizontal oscillator suitable for use with synchronizing signals subject to timing instability includes a switchable time constant filter coupled between the loop phase detector output and the horizontal oscillator input. Timing means coupled to the horizontal oscillator output provides timing signals to a selecting means which is coupled to a time constant control input terminal of the filter for selecting a first predetermined time constant value for the filter in response to a first timing signal at a time which occurs within one horizontal line rate period of a plurality of successive ones of horizontal rate synchronizing signals, and for selecting a second predetermined time constant value for the filter in response to a second timing signal at a time which occurs subsequent to the aforementioned plurality of successive horizontal rate synchronizing signals and prior to the end of the vertical blanking interval.

    SWITCHED AFPC LOOP FILTER WITH OFFSET VOLTAGE CANCELLATION
    7.
    发明专利
    SWITCHED AFPC LOOP FILTER WITH OFFSET VOLTAGE CANCELLATION 未知

    公开(公告)号：CA1136758A

    公开(公告)日：1982-11-30

    申请号：CA351678

    申请日：1980-05-09

    Applicant: RCA CORP

    Inventor： STECKLER STEVEN A ,  BALABAN ALVIN R

    IPC: H04N5/12 ,  H04N5/05 ,  H04N5/04

    Abstract: -18- RCA 73,477 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 disturbs the AFPC filtered oscillator control voltage. The disturbance is reduced by introducing a second offset voltage for reducing the disturbance and improving the synchronization of the oscillator with the synchronizing signals.

    VBE VUOLTAGE SOURCE TEMPERATURE COMPENSATION NETWORK
    9.
    发明专利
    VBE VUOLTAGE SOURCE TEMPERATURE COMPENSATION NETWORK 未知

    公开(公告)号：CA1034200A

    公开(公告)日：1978-07-04

    申请号：CA202213

    申请日：1974-06-11

    Applicant: RCA CORP

    Inventor： STECKLER STEVEN A

    IPC: G05F3/22 ,  G05F3/26

    Abstract: 1472988 Automatic current regulation RCA CORPORATION 17 July 1974 [3 Aug 1973] 31585/74 HeadingG3X A temperature-compensated constant current circuit includes a voltage source in the form of a conductive semi-conductor P-N junction, a resistor connected across the source, and a series combination of a resistor and a P-N junction also connected across the source. As shown in Fig. 2, transistors 22, 24 are supplied from a source B+, and the base and emitter of transistor 22 form a voltage source supplying current to a fixed resistor 29 and a resistor 35 connected in series with a diode-connected transistor 25. The values of the resistors are chosen so that, when the ambient temperature rises, the decrease in current in resistor 29 due to falling base-emitter voltage of transistor 22 is compensated by increased current in resistor 35 due to a smaller potential drop across transistor 25, producing substantially constant current flow in the main current paths of both transistors 22, 24. The regulator circuit is connected to the source B+ by way of a starting transistor 50 and a current repeater circuit in the form of an amplifier 10, 11, 12, 14, 15, 21, 23 receiving an input signal at point D and producing a proportional output current at point A, the ratio of output to input depending on the number of parallel diode-resistor paths 10, 14 and 11, 15 used. Loads requiring constant current may be connected in any of paths A-A', C-C', D-D' or between terminal G and a reference potential. In a modification, Fig. 3 (not shown), the effect of the collector-emitter output impedance of transistor 25 is reduced by connecting a further transistor (30) between point D' and the collector of transistor 25, in cascade with transistor 24.

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