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12 条记录 (耗时 0.008 秒)

    Method and apparatus for fast recovery from loss of lock in a phase locked loop
    4.
    发明公开
    Method and apparatus for fast recovery from loss of lock in a phase locked loop 有权
    在锁相环中断之后方法和用于快速重合闸摆动装置

    公开(公告)号：EP0915569A1

    公开(公告)日：1999-05-12

    申请号：EP98120698.0

    申请日：1998-11-06

    申请人： General Instrument Corporation

    发明人： Simon, Harris ,  Schmidt, Mark S. ,  Hardy, Fred ,  Myatt, Thomas

    IPC分类号： H03L7/14 ,  H03L7/10

    CPC分类号： H03J7/045 ,  H03J7/20

    摘要： Fast recovery is provided from transient loss of a received carrier in a satellite or terrestrial modem. A carrier tracking loop, loop filter and steering loop are provided in the modem. The occurrence of a transient condition affecting the carrier tracking loop is detected. The loop filter is flushed in response to the transient detection for a time period dependent upon an anticipated length of the transient condition. A voltage of the loop filter is steered toward a predetermined pre-transient value during the flushing step to minimize any change in frequency of the carrier tracking loop when the loop filter is flushed. After the filter has been flushed, the carrier tracking loop attempts to quickly reacquire the carrier.

    摘要翻译： 快速恢复是从卫星或地面调制解调器接收的载波的瞬态损耗提供。 在调制解调器本发明提供一种载波跟踪环路，环路滤波器和转向回路。 被检测的瞬变状态影响的载波跟踪环路的发生。 环路滤波器响应于瞬态检测为依赖于瞬变状态的预期长度的时间段冲洗。 该环路滤波器的电压被在冲洗步骤朝向预定预瞬态值转向当环路滤波器被冲洗，以尽量减少在载波跟踪环路的频率的任何变化。 该过滤器已冲洗后的载波跟踪环路试图重新获得快速的载体。

    Converter circuit for television signals
    6.
    发明公开
    Converter circuit for television signals 失效
    UmsetzerschaltungfürFernsehsignale。

    公开(公告)号：EP0024763A1

    公开(公告)日：1981-03-11

    申请号：EP80200777.3

    申请日：1980-08-19

    申请人： Philips Electronics N.V.

    发明人： van de Grijp, Abram

    IPC分类号： H03D7/16 ,  H03J7/20 ,  H04N7/04

    CPC分类号： H03D7/163 ,  H03J7/20

    摘要： A converter circuit (1) for RF signals for connection to the aerial input (3) of an RF superheterodyne receiver (2). In order to avoid a separate remote control of the converter circuit (1) use is made of the local oscillator radiation which is present at the aerial input of the connected RF-superheterodyne receiver (2) as an indication of the tuning frequency selected by the user with the tuning portion of the said RF superheterodyne receiver (2). The converter circuit (1) comprises a frequency search circuit (20) in which the frequency of the oscillator radiation is detected, an RF signal selector (11) which is controlled by the frequency search circuit (20) and by means of which the desired RF signal is selected from the RF signals applied to the converter circuit (1), furthermore comprising a modulator (18) which is also controlled by the frequency search circuit (20) and in which the selected RF signal is modulated on a carrier frequency which is determined by the tuning frequency and the intermediate frequency of the RF superheterodyne receiver (2).

    摘要翻译： A转换器电路（1），用于连接到RF超外差接收器（2）的天线输入（3）的RF信号。 为了避免转换器电路的单独的遥控（1），使用存在于所连接的RF超外差接收器（2）的天线输入端的本地振荡器辐射作为由 用户与所述RF超外差接收机（2）的调谐部分。 转换器电路（1）包括检测振荡器辐射频率的频率搜索电路（20），由频率搜索电路（20）控制的RF信号选择器（11），借助于该频率检测电路 RF信号从施加到转换器电路（1）的RF信号中选择，还包括调制器（18），其也由频率搜索电路（20）控制，并且其中所选择的RF信号在载波频率上被调制 由RF超外差接收机（2）的调谐频率和中频决定。

    Electronically tunable receiver
    7.
    发明公开
    Electronically tunable receiver 失效
    Elektronisch abstimmbarerEmpfänger。

    公开(公告)号：EP0015161A1

    公开(公告)日：1980-09-03

    申请号：EP80300566.9

    申请日：1980-02-26

    申请人： SHARP KABUSHIKI KAISHA

    发明人： Konishi, Hideo 383-2 Tenbayashi ,  Matsuoka, Kazunori ,  Gouya, Takao

    IPC分类号： H03J7/28 ,  H03J1/16

    CPC分类号： H03J1/16 ,  H03J7/20 ,  H03J7/285

    摘要： An electronically tunable radio receiver has a common actuator (3) for both controlling the speed at which a local oscillator frequency is varied and selecting between DX and LOCAL receiver modes. Preferably a digital oscillator (10) has an output which determines the speed at which the local oscillation frequency is swept. An oscillation frequency controlling element (7b) which forms an external oscillation frequency control section of the digital oscillator (10) and a circuit constant variable upon variations in its working length, is mounted around the shaft (4) of an operator-operable knob (3) on the operational panel (1) of the radio receiver in the path of a sweep speed controlling element (5) mounted coaxially thereto. The sweep speed controlling element (5) and the oscillation frequency controlling element (7b) are connected to an input section of the digital oscillator (10). There is further provided a DX / LOCAL receiver mode selecting element (6) mounted coaxially on the knob shaft (4).

    摘要翻译： 电子可调谐无线电接收机具有用于控制本地振荡器频率变化的速度和在DX和LOCAL接收器模式之间进行选择的公共致动器（3）。 优选地，数字振荡器（10）具有确定本地振荡频率被扫描的速度的输出。 形成数字振荡器（10）的外部振荡频率控制部分的振荡频率控制元件（7b）和其工作长度变化时的电路常数可变地安装在操作者可操作的旋钮的轴（4）周围 3）在与其同轴安装的扫描速度控制元件（5）的路径中的无线电接收机的操作面板（1）上。 扫描速度控制元件（5）和振荡频率控制元件（7b）连接到数字振荡器（10）的输入部分。 还提供了同轴地安装在旋钮轴（4）上的DX / LOCAL接收器模式选择元件（6）。

    A device and a method for tuning a radio receiver unit by frequency band scanning
    10.
    发明公开
    A device and a method for tuning a radio receiver unit by frequency band scanning 有权
    装置和方法，用于通过频带扫描调谐无线电接收机

    公开(公告)号：EP1605591A1

    公开(公告)日：2005-12-14

    申请号：EP04013688.9

    申请日：2004-06-10

    申请人： Ford Global Technologies, LLC

    发明人： Ekelund, Per

    IPC分类号： H03J1/00 ,  H03J7/18 ,  H04B1/16

    CPC分类号： H03J1/0075 ,  H03J1/0091 ,  H03J7/183 ,  H03J7/20 ,  H04H60/41 ,  H04H2201/13

    摘要： This invention relates to a radio receiver unit (1) for use in a radio network environment, the receiver unit (1) comprising means for enabling a scanning through a radio frequency band in search of a radio station transmitting a desired radio content, wherein the receiver unit is arranged to halt a scanning through the radio frequency band at a stop frequency (f 2 ) transmitted by a first radio station and having a signal strength above a predetermined search_stop_level, whereafter the radio receiver unit (1) is arranged to stay tuned to said first radio station for a predetermined scanning stop time period (T s ).
    According to this invention, the receiver unit further comprises a memory (14), in which the stop frequency (f 2 ) is stored, at least until the expiry of said predetermined scanning stop time period (T s ).
    The receiver unit is arranged to reproduce said first radio station on any frequency out of an alternative frequency pick list (e.g. the AF feature from RDS) during said predetermined scanning stop time period (T s ). At the expiry of said predetermined scanning stop time period (T s ) the scanning resumes from the stored stop frequency (f 2 ) unless a stop_scan_command has been issued during said predetermined scanning stop time (T s ).