Analog signal compression circuit
    1.
    发明授权
    Analog signal compression circuit 失效
    模拟信号压缩电路

    公开(公告)号:US5023490A

    公开(公告)日:1991-06-11

    申请号:US369404

    申请日:1989-06-21

    CPC classification number: H03G7/06 G06G7/20

    Abstract: A desired non-linear, monotonic compression function is performed substantially symmetrically upon both polarities of an AC signal by a circuit having a plurality of limiting stages, each having input circuitry with like terminals connected in parallel to one another, and providing an output current proportional to the stage input voltage, with a gain constant decreasing for an increasing stage number. Each stage has output circuitry connected in parallel with one another and providing an output current proportional to the stage input voltage, with a gain constant decreasing for an increasing stage number. A single output stage converts the total current provided by the limiter stages to an output voltage.

    Abstract translation: 通过具有多个限制级的电路对AC信号的两个极性基本对称地执行期望的非线性单调压缩函数,每个限制级具有彼此并联连接的类似端子的输入电路,并提供成比例的输出电流 到舞台输入电压,对于增加的舞台号,增益常数减小。 每个级具有彼此并联连接的输出电路,并且提供与级输入电压成比例的输出电流,对于增加的级数,增益常数减小。 单个输出级将限幅器级提供的总电流转换为输出电压。

    Portable collapsing antenna
    2.
    发明授权
    Portable collapsing antenna 失效
    便携式折叠天线

    公开(公告)号:US4475111A

    公开(公告)日:1984-10-02

    申请号:US349278

    申请日:1982-02-16

    CPC classification number: H01Q11/086

    Abstract: A one-piece, collapsible, readily-portable and rapidly-erectable antenna includes a substantially-planar and electrically-conductive ground plane consisting essentially of a central base element and a plurality of electrically conductive assemblies uniformly spaced about and mounted on the base element, the assemblies being guided on telescoping support rods for movement between expanded and collapsed positions relative to the base assembly. An at-least-three-sided elongated frame structure has a first end mounted on the base element; the other end is movable toward and away from the base element between collapsed and expanded frame structure positions, to collapsibly support a conductive radiator portion, comprising a metal helix. The helix is extended when the frame structure is expanded and is retracted when the frame structure is collapsed. A plurality of elongated rods are mounted on the frame structure for generally radial slidable movement of at least one end portion of each rod toward and away from the frame structure as the frame structure moves between expanded and collapsed positions.

    Abstract translation: 一体式的,可折叠的,易于携带的和快速可直立的天线包括基本上平面且导电的接地平面,其基本上由中心基座元件和均匀间隔开并安装在基座元件上的多个导电组件组成, 该组件在伸缩式支撑杆上被引导,用于在相对于基座组件的膨胀位置和折叠位置之间移动。 至少三边的细长框架结构具有安装在基底元件上的第一端; 另一端可在塌陷和膨胀的框架结构位置之间朝向和远离基座元件移动,以可折叠地支撑包括金属螺旋的导电散热器部分。 当框架结构膨胀时,螺旋延伸,并且当框架结构折叠时缩回。 当框架结构在膨胀位置和折叠位置之间移动时,多个细长杆安装在框架结构上用于使每个杆的至少一个端部朝向和远离框架结构的大体上径向滑动运动。

    System for compatible transmission of high-resolution TV
    3.
    发明授权
    System for compatible transmission of high-resolution TV 失效
    高分辨率电视兼容传输系统

    公开(公告)号:US4521803A

    公开(公告)日:1985-06-04

    申请号:US433562

    申请日:1982-10-07

    CPC classification number: H04N11/002 H04N11/008

    Abstract: A high-resolution television system is described which provides twice the vertical resolution of present television standards and is compatible therewith. A high-resolution television camera substantially simultaneously provides information from each of a pair of adjacent scan lines; the luminance information of both lines is added to provide information for amplitude modulation onto a luminance carrier, while the difference in luminance of the two adjacent scan lines is utilized to modulate a carrier phased in quadrature with the luminance carrier. The chrominance values of both lines are added to modulate a chrominance carrier. The bandwidth of the resulting luminance and chrominance signals are compatible with that of a carrier modulated by a single raster line. At a television receiver, a synchronous quadrature detector provides the sum and difference luminance signals, which are then respectively added to and subtracted from one another to obtain the adjacent line luminance signals for display upon a picture tube in a high-definition television set. A standard television set utilizes only the additive luminance signal to display a compatible picture. Increased horizontal definition, by increasing transmitted signal bandwidth or by utilization of horizontal interlace, and/or increased chroma definition, may be utilized alone or in conjunction with increased vertical resolution to provide a total high-resolution television picture.

    Abstract translation: 描述了高分辨率电视系统,其提供了现行电视标准的垂直分辨率的两倍并且与之兼容。 高分辨率电视摄影机基本上同时从一对相邻扫描线中的每一个提供信息; 相加两条线的亮度信息,以将幅度调制信息提供到亮度载波上,同时利用两个相邻扫描线的亮度差来调制与亮度载波正交的载波。 添加两行的色度值以调制色度载体。 所得到的亮度和色度信号的带宽与由单个光栅线调制的载波的带宽兼容。 在电视接收机中,同步正交检测器提供和亮度信号和差分亮度信号,然后将它们分别相加并相减,以获得用于在高分辨率电视机中的显像管上显示的相邻行亮度信号。 标准电视机仅利用附加亮度信号来显示兼容的图像。 增加的水平清晰度,通过增加传输的信号带宽或利用水平交错和/或增加的色度定义可以单独使用或结合增加的垂直分辨率来使用以提供总高分辨率电视图像。

    Doubling mixer
    5.
    发明授权
    Doubling mixer 失效
    加倍搅拌机

    公开(公告)号:US3983489A

    公开(公告)日:1976-09-28

    申请号:US586876

    申请日:1975-06-16

    CPC classification number: H03D7/02

    Abstract: A doubling mixer includes an input tuned circuit adjusted to the frequency of an input signal, an output tuned circuit tuned to the desired output frequency, and a local oscillator. Semiconductor switch means are interposed between said input and output tuned circuits, the switch means being responsive to the local oscillator to conduct twice during each cycle thereof. The relationship between the input and output signal frequencies as a function of the local oscillator frequency may be expressed as:F.sub.IF = F.sub.S .+-. 2 F.sub.LO

    Abstract translation: 加倍混频器包括调整到输入信号的频率,调谐到期望输出频率的输出调谐电路和本地振荡器的输入调谐电路。 半导体开关装置插入在所述输入和输出调谐电路之间,所述开关装置响应本地振荡器在其每个周期期间进行两次。 作为本地振荡器频率的函数的输入和输出信号频率之间的关系可以表示为:

    Multiple frequency band receiver tuner system using single,
non-bandswitched local oscillator
    6.
    发明授权
    Multiple frequency band receiver tuner system using single, non-bandswitched local oscillator 失效
    多频段接收机调谐器系统采用单频,非频带本地振荡器

    公开(公告)号:US3931578A

    公开(公告)日:1976-01-06

    申请号:US428074

    申请日:1973-12-26

    CPC classification number: H04N7/10 H03D7/163 H03J5/242 H03B19/00

    Abstract: A single, non-bandswitched local oscillator in a UHF, VHF, CATV television receiver tuner system is employed with frequency multiplying and, or frequency dividing to obtain the required IF frequencies. The tuner operates in a double frequency conversion mode at UHF frequency with a tuned VHF RF amplifier dual functioning as a UHF IF amplifier. A UHF preselector and the VHF RF amplifier are gang-tuned with the local oscillator. The tuner operates in a single frequency conversion mode at VHF and CATV frequencies, and one of the local oscillator frequency dividing or doubling stages is utilized to distinguish the VHF low band from the high VHF-CATV tuning band.

    Abstract translation: 在UHF,VHF,CATV电视接收机调谐器系统中采用单个非带通开关本地振荡器,其具有频率倍增和/或分频以获得所需的IF频率。 调谐器以UHF频率的双频率转换模式工作,调谐的VHF RF放大器双功能用作UHF IF放大器。 UHF预选器和VHF RF放大器与本地振荡器进行组合调谐。 调谐器以VHF和CATV频率在单个频率转换模式下工作,并且利用本地振荡器分频或倍频级之一来区分VHF低频带与高VHF-CATV调谐频带。

Patent Agency Ranking