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    Emitter coupled sync separator
    61.
    发明授权
    Emitter coupled sync separator 失效
    发射机联轴器同步分离器

    公开(公告)号：US3858003A

    公开(公告)日：1974-12-31

    申请号：US29122472

    申请日：1972-09-22

    Applicant: ADMIRAL CORP

    Inventor： SCOUBIS J

    IPC: H04N5/08

    CPC classification number: H04N5/08

    Abstract: An emitter coupled sync separator for a television receiver comprising a pair of transistors connected together with the first transistor receiving the composite video signal and gated to the on condition at a level which is approximately 50% of the height of the sync pulse and remains on until it is turned off at a time t2 when the signal drops down to the same level again. The second transistor is coupled to the first transistor such that it is turned off when the first transistor is turned on. The input signal is coupled to the base of the first transistor through a parallel resistor and capacitor which determines the level at which the first transistor turns on and off. The circuit provides extremely fast response and is inherently immune to noise due to the very small window of the horizontal pulse. The circuit is capable of use over a wide range of amplitude of the composite video.

    Abstract translation: 一种用于电视接收机的发射极耦合同步分离器，包括与第一晶体管连接在一起的一对晶体管，其接收复合视频信号，并且以等于约同步脉冲高度的50％的电平门控到导通条件，并保持直到 当信号再次下降到同一电平时，它在时间t2关闭。 第二晶体管耦合到第一晶体管，使得当第一晶体管导通时它被截止。 输入信号通过并联电阻器和电容器耦合到第一晶体管的基极，该并联电阻器和电容器确定第一晶体管导通和关断的电平。 该电路提供非常快速的响应，并且由于水平脉冲的非常小的窗口而固有地免于噪声。 该电路能够在复合视频的宽幅度范围内使用。

    Vhf-uhf varactor tuner control circuit
    62.
    发明授权
    Vhf-uhf varactor tuner control circuit 失效
    VHF-UHF变送器调谐器控制电路

    公开(公告)号：US3686575A

    公开(公告)日：1972-08-22

    申请号：US3686575D

    申请日：1970-02-26

    Applicant: ADMIRAL CORP

    Inventor： CHAMBERLAIN RICHARD TRAVERS

    IPC: H03J5/24 ,  H04B1/06

    CPC classification number: H03J5/244

    Abstract: A television tuner control circuit which provides equal presentation of all channels on the VHF and UHF bands is disclosed. The tuner used in combination with the circuit of this invention is capable of receiving both VHF and UHF channels, and includes a plurality of tuned resonant circuits including voltage controlled impedance and switching elements. The control circuit includes a sequential switch for selecting between VHF and UHF bands of broadcast channels and a variable voltage supply device for controlling the impedance and switching elements and thus selecting the channel of interest within the chosen band of frequencies. Utilizing the control circuit of this invention, a single control on the television receiver''s control panel may be used to select any station on the VHF and UHF bands.

    Abstract translation: 公开了一种在VHF和UHF频带上提供所有信道的相等呈现的电视调谐器控制电路。 与本发明的电路组合使用的调谐器能够接收VHF和UHF信道，并且包括多个调谐谐振电路，包括电压控制的阻抗和开关元件。 控制电路包括用于在广播频道的VHF和UHF频带之间进行选择的顺序开关和用于控制阻抗和开关元件的可变电压供应装置，从而选择所选择的频带内的感兴趣的频道。 利用本发明的控制电路，可以使用电视接收机控制面板上的单个控制来选择VHF和UHF频带上的任何站。

    Reactance tube controlled pentode oscillator
    63.
    发明授权
    Reactance tube controlled pentode oscillator 失效
    反应管控蝶阀振荡器

    公开(公告)号：US3643179A

    公开(公告)日：1972-02-15

    申请号：US3643179D

    申请日：1969-07-30

    Applicant: ADMIRAL CORP

    Inventor： JAROSZ GEORGE J

    IPC: H03B5/10 ,  H03B3/04 ,  H03C3/14

    CPC classification number: H03B5/10

    Abstract: A reactance oscillator having a pentode as the active oscillator element and having a triode as a variable reactance element. A number of energy storage elements are associated with the pentode oscillator in the usual manner, and one of these elements comprises the variable capacitance of the triode. Feedback from the pentode oscillator is accomplished through an integrating circuit which couples energy of the correct phase to the cathode of the triode. The pentode operates as a peak detector or a class C oscillator, conducting for less than 90* of the operating cycle. Essentially, the signal developed at the cathode of the pentode is a pulse waveform, resulting in a sawtooth waveform after being integrated. The sawtooth waveform, however, has a fundamental frequency which lags the voltage at the anode of the triode by approximately 90*. This fundamental, being coupled to the cathode of the triode, produces a current in the triode which is 180* out of phase. The result is that the current through the triode leads the voltage by approximately 90* producing the desired reactance. The magnitude of this reactance may be varied by varying the applied voltage to the control grid of the triode.

    Abstract translation: 具有五极管作为有源振荡元件并具有三极管作为可变电抗元件的电抗振荡器。 许多能量存储元件以通常的方式与五极管振荡器相关联，并且这些元件中的一个包括三极管的可变电容。 来自五极管振荡器的反馈通过将正确相的能量耦合到三极管的阴极的积分电路来实现。 五极管作为峰值检测器或C类振荡器工作，运行时间小于90°。 基本上，在五极管的阴极处产生的信号是脉冲波形，在集成后产生锯齿波形。 然而，锯齿波形具有基本频率，其在三极管的阳极处的电压滞后大约90°。 耦合到三极管的阴极的这个基本原理是在三相极中产生180度异相的电流。 结果是通过三极管的电流导致电压大约90°，产生所需的电抗。 可以通过改变施加到三极管控制栅极的电压来改变该电抗的大小。

    Variable coupling if amplifier including a double-tuned circuit
    64.
    发明授权
    Variable coupling if amplifier including a double-tuned circuit 失效
    如果放大器包括双调谐电路，则可变耦合

    公开(公告)号：US3562412A

    公开(公告)日：1971-02-09

    申请号：US3562412D

    申请日：1969-03-26

    Applicant: ADMIRAL CORP

    Inventor： CALLAWAY EMORY C

    IPC: H03G9/24 ,  H04N5/44 ,  H04N5/50 ,  H04N9/00

    CPC classification number: H04N5/4446 ,  H03G9/24

    Abstract: The first IF stage in a color television receiver comprises a transistor biased for forward AGC operation and having a collector impedance varying inversely with the strength of a selected television signal. A double-tuned circuit, incorporating the transistor collector impedance, displays a frequency characteristic having a maximum response approximately midway between two preselected optimum frequencies when the collector impedance is small, and maximum responses near both optimum frequencies when the collector impedance is large, whereby the receiver can be desirably fine tuned even under weak signal conditions.

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