Digital receiver with tunable analog parameters and method therefor
    1.
    发明授权
    Digital receiver with tunable analog parameters and method therefor 失效
    具有可调谐模拟参数的数字接收机及其方法

    公开(公告)号:US5721756A

    公开(公告)日:1998-02-24

    申请号:US620671

    申请日:1996-03-26

    IPC分类号: H04L1/20 H04L27/22 H04L27/06

    CPC分类号: H04L1/208 H04L1/20 H04L27/22

    摘要: A digital data receiver includes tunable analog components having variable parameters that are responsive to the bit error rate (BER) of the decoded digital data. The analog components include a quadrature generator having a tunable phase shifter, an analog filter having a tunable bandwidth, a tunable magnitude equalizer circuit, a tunable group delay equalizer circuit, and an amplifier having an adjustable gain. The tunable components are controlled by tuning control signals that incorporate digitally-produced fine tuning signals. The digital tuning signals are altered in accordance with realtime changes in the BER.

    摘要翻译: 数字数据接收机包括具有可变参数的可调模拟分量,该参数响应于解码的数字数据的误码率(BER)。 模拟部件包括具有可调谐移相器的正交发生器,具有可调谐带宽的模拟滤波器,可调幅度均衡器电路,可调组延迟均衡器电路和具有可调节增益的放大器。 通过调谐控制信号控制可调组件,该控制信号包含数字产生的微调信号。 数字调谐信号根据BER的实时变化而改变。

    Multi-rate branch metric processor for maximum-likelihood convolutional
decoder
    3.
    发明授权
    Multi-rate branch metric processor for maximum-likelihood convolutional decoder 失效
    用于最大似然卷积解码器的多速率分支度量处理器

    公开(公告)号:US4500994A

    公开(公告)日:1985-02-19

    申请号:US432489

    申请日:1982-10-04

    IPC分类号: H03M13/41 G06F11/12

    CPC分类号: H03M13/41

    摘要: A branch metric processor for use in a maximum-likelihood convolutional decoder accepts a set of soft-decision symbols, an indicator of a level of quantization thereof and a set of erase control signals and generates branch metrics for base code rates of 1/3 and 1/2. The apparatus represents a substantial reduction in complexity over prior art devices. Erasure of selected symbols allows the processor to generate branch metrics for higher code rates and is advantageous in very low code rate applications.

    摘要翻译: 用于最大似然卷积解码器的分支度量处理器接受一组软判决符号,其量化级别的指示符和一组擦除控制信号,并产生用于基本码率为1/3的分支度量, 1/2。 该装置代表了现有技术装置的复杂性的显着降低。 擦除所选择的符号允许处理器产生用于更高码率的分支度量,并且在非常低的码率应用中是有利的。

    Video lighthead with dimmer control and stabilized intensity
    8.
    发明授权
    Video lighthead with dimmer control and stabilized intensity 失效
    视频灯头具有调光控制和稳定的强度

    公开(公告)号:US5994844A

    公开(公告)日:1999-11-30

    申请号:US989923

    申请日:1997-12-12

    IPC分类号: G03B15/02 H05B39/04 G01J1/32

    摘要: A video lighthead mountable to a video camera and having a dimmer control that varies the intensity of the light output from the lighthead using pulse width modulation techniques. A photo sensor measures the intensity of light reflected from a subject in front of the lighthead. The intensity of light output from the lighthead is adjusted by control circuitry in response to changes in measured reflected light intensity to maintain a constant level of illumination. The adjustment is carried out by modifying the duty cycle of a pulse width modulation circuit. The duty cycle adjustment of the pulse width modulation is also used to compensate for supply voltage variations in order to maintain constant light output.

    摘要翻译: 一种可安装到摄像机的视频光头,并具有使用脉冲宽度调制技术改变从光头的输出强度的调光控制。 光传感器测量从光头前面的被摄体反射的光的强度。 响应于测量的反射光强度的变化,由光控制器输出的光的强度由控制电路进行调节,以保持恒定的照明水平。 通过修改脉宽调制电路的占空比进行调整。 脉冲宽度调制的占空比调整也用于补偿电源电压变化,以保持恒定的光输出。

    Motor construction
    9.
    发明授权
    Motor construction 失效
    电机施工

    公开(公告)号:US3946260A

    公开(公告)日:1976-03-23

    申请号:US498463

    申请日:1974-08-19

    IPC分类号: H02K16/00 H02K19/10 H02K5/04

    CPC分类号: H02K19/106 H02K16/00

    摘要: A compact AC-DC motor comprising a housing having a center section and respective end bells, each having a recess therein. A stator is received in the housing and extends into the recess in one end bell and a magnetic pole piece is similarly received in the housing and extends into the recess in the other end bell. Rotatably supported in the end bells is a shaft which mounts a rotor which cooperates with the stator, and an armature winding in juxtaposition to the rotor which cooperates with the pole piece. Additionally, a brush holder is affixed to the end of the pole piece whereby the construction provides a highly efficient motor which occupies a minimum volume of space.

    摘要翻译: 一种紧凑型AC-DC电动机,其包括具有中心部分和相应的端部钟形的壳体,每个端部罩具有凹部。 定子被容纳在壳体中并延伸到一个端罩中的凹部中,并且磁极片类似地容纳在壳体中并延伸到另一端钟的凹部中。 可旋转地支撑在端铃中的是安装与定子协作的转子的轴,以及与极片配合的转子并联的电枢绕组。 此外,电刷架固定在极靴的端部,由此该结构提供占用最小空间体积的高效电动机。

    Viewfinder assembly
    10.
    发明授权
    Viewfinder assembly 失效
    取景器装配

    公开(公告)号:US3931630A

    公开(公告)日:1976-01-06

    申请号:US498949

    申请日:1974-08-20

    申请人: James J. Crawford

    发明人: James J. Crawford

    IPC分类号: G03B13/02 G03B13/10

    CPC分类号: G03B13/10 G03B13/02

    摘要: A viewfinder assembly for a camera having a door for access to the interior wherein the viewfinder, when properly positioned to permit pictures to be taken, blocks the door. The assembly comprises a support barrel mounted on a camera lens and a main body section adapted to support optical elements therein. An eyepiece is at one end of the main body section and extends outwardly therefrom. The invention includes mounting means for rotatably mounting the main body section on the support barrel to permit rotation of the viewfinder assembly to a position wherein the door is no longer blocked.

    摘要翻译: 一种用于摄像机的取景器组件,具有用于进入内部的门,其中,当正确定位以允许拍摄照片时,取景器阻挡门。 组件包括安装在相机镜头上的支撑筒和适于在其中支撑光学元件的主体部分。 目镜在主体部分的一端并向外延伸。 本发明包括用于将主体部分可旋转地安装在支撑筒上的安装装置,以允许取景器组件旋转到门不再被阻挡的位置。