中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

276 records (took 0.033 seconds)

    Integrated voice mail system for CDMA network
    111.
    发明授权
    Integrated voice mail system for CDMA network 失效
    CDMA网络综合语音邮件系统

    公开(公告)号：US6069888A

    公开(公告)日：2000-05-30

    申请号：US806980

    申请日：1997-02-26

    Applicant: Peter LaRocca

    Inventor： Peter LaRocca

    IPC: H04M3/53 ,  H04M3/42 ,  H04M3/533 ,  H04W4/12 ,  H04B7/216

    CPC classification number: H04W4/12 ,  H04M3/533 ,  H04M2207/18

    Abstract: A voice mail system is provided in a CDMA wireless telephone system in which a base station controller (BSC) stores, in a encoded format, voice data transmitted by a wireless telephone to a receiving telephone, either wireless or fixed telephone, when the receiving telephone does not "pick up". Also, the base station controller encodes and then stores voice data that is transmitted by a fixed telephone to a wireless telephone when the wireless telephone does not "pick up". In either case, to retrieve voice mail the intended recipient can access the voice mail from a fixed telephone, in which case the voice mail is decoded at the BSC and then sent to the fixed telephone via a landline. Alternatively, the intended recipient can access the voice mail from a wireless telephone in the system, in which case the voice mail is not decoded at the BSC, but is transmitted directly to the wireless telephone, where the message is decoded. In any case, the voice mail undergoes only a single encoding/decoding process, thereby improving the sound quality of the retrieved voice mail messages compared to systems in which tandem vocoding occurs.

    Abstract translation: 在CDMA无线电话系统中提供语音邮件系统，其中基站控制器（BSC）以编码格式将无线电话发送的语音数据以无线或固定电话的形式存储到接收电话，无线或固定电话 不“拾起”。 此外，当无线电话没有“拾取”时，基站控制器编码然后存储由固定电话发送到无线电话的语音数据。 在任一情况下，为了检索语音邮件，预期接收者可以从固定电话接收语音邮件，在这种情况下，语音邮件在BSC被解码，然后通过固定电话发送到固定电话。 或者，预期的接收者可以从系统中的无线电话接收语音邮件，在这种情况下，语音邮件不在BSC被解码，而是被直接发送到消息被解码的无线电话。 在任何情况下，语音邮件仅经历单个编码/解码过程，从而与发生串联声音发生的系统相比，提高了所检索的语音邮件消息的声音质量。

    Coherent signal processing for CDMA communication system
    112.
    发明授权
    Coherent signal processing for CDMA communication system 失效
    CDMA通信系统的相干信号处理

    公开(公告)号：US5987076A

    公开(公告)日：1999-11-16

    申请号：US687899

    申请日：1996-07-29

    Applicant: Ephraim Zehavi ,  Serge Willenegger ,  Joseph P. Odenwalder

    Inventor： Ephraim Zehavi ,  Serge Willenegger ,  Joseph P. Odenwalder

    IPC: H04B1/709 ,  H04B1/7115 ,  H04B7/26 ,  H03D1/00

    CPC classification number: H04B1/7115 ,  H04B1/709 ,  H04B2201/70703

    Abstract: A novel and improved method and apparatus for coherently processing a CDMA signal without the use of pilot or other synchronization information is described. By utilizing a coherent receive processing system, a reverse link signal can be properly processed when received at a lower power level than that associated with noncoherent only processing. This reduces the transmit power necessary for successful communication, and this reduction in necessary transmit power reduces the degree to which a set of subscriber units communicating with the same base station interfere with one another. In turn, this increases the overall system capacity of a CDMA wireless telecommunication system incorporating the invention.

    Abstract translation: 描述了一种用于在不使用导频或其他同步信息的情况下相干处理CDMA信号的新颖和改进的方法和装置。 通过利用相干的接收处理系统，当以与非相干的仅处理相关联的较低功率电平接收时，可以适当地处理反向链路信号。 这降低了成功通信所需的发射功率，并且必要发射功率的减少降低了与同一基站通信的一组用户单元相互干扰的程度。 这又增加了包含本发明的CDMA无线电信系统的总体系统容量。

    Direct digital synthesizer driven phase lock loop frequency synthesizer with hard limiter
    113.
    发明授权
    Direct digital synthesizer driven phase lock loop frequency synthesizer with hard limiter 失效
    直接数字合成器驱动锁相环频率合成器与硬限幅器

    公开(公告)号：US5028887A

    公开(公告)日：1991-07-02

    申请号：US502101

    申请日：1990-03-29

    Applicant: Robert P. Gilmore

    Inventor： Robert P. Gilmore

    IPC: H03B28/00 ,  H03L7/18 ,  H03L7/183

    CPC classification number: H03L7/183 ,  H03L7/1806

    Abstract: A frequency synthesizer which uses a direct digital synthesizer (DDS) to generate a highly accurate periodic signal of a frequency selected from a plurality of reference frequencies. The DDS output signal is bandpass filtered and amplitude limited to reduce spurious noise. In one embodiment, the DDS frequency synthesizer is coupled to a phase lock loop which receives the DDS generated reference signal and a divide-by-N signal for generating an output signal at a frequency determined by the divide-by-N signal. The frequency resolution of the phase lock loop is N times the reference signal. In a second embodiment, the DDS is incorporated within the feedback path of the phase lock loop. An input reference frequency signal is provided to the phase lock loop with the DDS clock signal provided as a function of the phase lock loop output frequency. The DDS receives an input frequency control signal which determines the DDS step size. The synthesizer output frequency is a function of the input reference frequency, the number of bits in the digital word of the frequency control signal and the DDS step size as determined by the frequency control signal. Optional dividers may be provided in the feedback path which may further affect the synthesizer output frequency.

    Abstract translation: 一种频率合成器，其使用直接数字合成器（DDS）来产生从多个参考频率中选择的频率的高度精确的周期信号。 DDS输出信号经过带通滤波和幅度限制，以减少杂散噪声。 在一个实施例中，DDS频率合成器被耦合到接收DDS产生的参考信号的锁相环和用于产生由N分频信号确定的频率的输出信号的N分频信号。 锁相环的频率分辨率是参考信号的N倍。 在第二实施例中，DDS被并入在锁相环的反馈路径内。 将输入参考频率信号提供给锁相环，其中DDS时钟信号作为锁相环输出频率的函数提供。 DDS接收确定DDS步长的输入频率控制信号。 合成器输出频率是输入参考频率，频率控制信号的数字字中的位数和由频率控制信号确定的DDS步长的函数。 可以在反馈路径中提供可选的分频器，其可以进一步影响合成器的输出频率。

    Dual satellite navigation system
    114.
    发明授权
    Dual satellite navigation system 失效
    双卫星导航系统

    公开(公告)号：US5017926A

    公开(公告)日：1991-05-21

    申请号：US446979

    申请日：1989-12-05

    Applicant: William G. Ames ,  Irwin M. Jacobs ,  Lindsay A. Weaver, Jr. ,  Klein S. Gilhousen

    Inventor： William G. Ames ,  Irwin M. Jacobs ,  Lindsay A. Weaver, Jr. ,  Klein S. Gilhousen

    IPC: G01S5/12 ,  G01S5/14 ,  G01S13/87 ,  G01S19/00 ,  G01S19/01 ,  G01S19/38 ,  G01S19/48 ,  H04B7/185

    CPC classification number: G01S19/00 ,  G01S13/46 ,  G01S13/876 ,  G01S19/38 ,  G01S5/14 ,  G01S2013/466

    Abstract: A method and system for determining the position of an object using a fixed station and a plurality of earth orbit satellites whose positions are known. Separate periodic signals are transmitted from the fixed station via first and second satellites to the object whose postion is to be determined. The phase offset in periodic characteristics of the periodic signals as received from the first and second satellites is measured at the object. The phase offset corresponds to a relative time difference in propagation of the signals traveling two different paths to the object. The object transmits via the first satellite a return signal indicative of the measured relative time difference. This return signal is activated some time in the future according to the object local time, which is slaved to receipt of the periodic signal sent through the first satellite. This future time is the start of the particular time period as decided by the fixed station's schedule. At the fixed station, an instantaneous round trip delay, determined by the time offset of the current transmission clock time relative to the receive clock time of reception of the return signal, along with the measured relative time difference sent back on the return signal, is used to calculate the distances between the first and second satellites to the object. From these distances the position of the object is calculated.

    Abstract translation: 一种用于使用固定站和位置已知的多个地球轨道卫星来确定物体的位置的方法和系统。 分离的周期信号从固定站经由第一和第二卫星发送到要确定位置的对象。 在物体处测量从第一和第二卫星接收的周期性信号的周期特性中的相位偏移。 相位偏移对应于传播到对象的两个不同路径的信号的传播的相对时间差。 物体经由第一卫星发送指示所测量的相对时间差的返回信号。 该返回信号在将来根据对象本地时间被激活一段时间，该对象本地时间被接收通过第一卫星发送的周期信号。 这个未来时间是由固定电台的时间表决定的特定时间段的开始。 在固定站，由当前传输时钟时间相对于接收返回信号的接收时钟时间的时间偏移确定的瞬时往返延迟以及在返回信号上发回的测量的相对时间差是 用于计算第一和第二卫星与物体之间的距离。 从这些距离计算物体的位置。

    High resolution phase to sine amplitude conversion
    115.
    发明授权
    High resolution phase to sine amplitude conversion 失效
    高分辨率相位正弦振幅转换

    公开(公告)号：US4905177A

    公开(公告)日：1990-02-27

    申请号：US145789

    申请日：1988-01-19

    Applicant: Lindsay A. Weaver, Jr. ,  Richard J. Kerr

    Inventor： Lindsay A. Weaver, Jr. ,  Richard J. Kerr

    IPC: G06F1/02 ,  G06F1/035 ,  G06F17/10 ,  H03B28/00 ,  H03M1/66 ,  H04L27/18

    CPC classification number: G06F1/0356 ,  G06F2101/04 ,  G06F2101/08

    Abstract: A method and apparatus for converting phase data into amplitude data. Input phase data is divided into upper and lower phase increments using an input splitter which can also fold in quadrant data. One or more storage elements, such as sine and cosine ROMs, are connected to the input splitter and generate an amplitude, which forms one of a plurality of series terms, and first and second derivatives of the amplitude in response to the upper phase increment. The first derivative and lower phase increment are multiplied together in a digital multiplier to produce a second series term. A third series term comprising a product of the amplitude and lower phase increment squared, is generated by a term generator connected to the splitter and to the storage element. The term generator can comprise elements such as a ROM addressable by the lower phase increment and the amplitude. The first, second and third series terms are subsequently added together by one or more digital adders connected to the multiplier, term generator, storage element and in series with each other to form an output amplitude. An output controller is used for transferring the output amplitude to other apparatus and for incorporating quadrant unfolding elements.

    Abstract translation: 一种用于将相位数据转换成振幅数据的方法和装置。 使用输入分配器将输入相位数据分为上，下相位增量，也可以在象限数据中折叠。 一个或多个存储元件，例如正弦和余弦ROM，连接到输入分配器，并产生一个振幅，其形成多个串联项中的一个，以及响应于上相位增量的振幅的第一和第二导数。 第一导数和下相位增量在数字乘法器中相乘以产生第二串联项。 包括幅度和相位递减平方的乘积的第三系列项由连接到分路器和存储元件的术语发生器产生。 术语发生器可以包括诸如可通过较低相位增量和幅度寻址的ROM的元件。 第一，第二和第三系列术语随后通过连接到乘法器，术语发生器，存储元件并且彼此串联的一个或多个数字加法器相加在一起以形成输出幅度。 输出控制器用于将输出振幅转移到其他装置并用于结合象限展开元件。

    Spread spectrum multiple access communication system using satellite or terrestrial repeaters
    116.
    发明授权
    Spread spectrum multiple access communication system using satellite or terrestrial repeaters 失效
    使用卫星或地面中继器的扩频多址通信系统

    公开(公告)号：US4901307A

    公开(公告)日：1990-02-13

    申请号：US921261

    申请日：1986-10-17

    Applicant: Klein S. Gilhousen ,  Irwin M. Jacobs ,  Lindsay A. Weaver, Jr.

    Inventor： Klein S. Gilhousen ,  Irwin M. Jacobs ,  Lindsay A. Weaver, Jr.

    IPC: H04J13/00 ,  H04B7/15 ,  H04B7/216 ,  H04B7/26

    CPC classification number: H04B7/2041 ,  H04B7/216 ,  H04B2201/70701

    Abstract: A multiple access, spread spectrum communication system and method for providing high capacity communications to, from, or between a plurality of system users, using code-division-spread-spectrum communication signals. The communication system uses means for providing marginal isolation between user communication signals. The marginal isolation is provided by generating simultaneous multiple steerable beams; using an omni-directional antenna with polarization enhancement; using power control devices to adjust the output power for user generated communication signals either in response to their input activity level, or in accordance with a minimum allowable power for maintaining a communication link. The communication system can also employ a means for transmitting a predetermined pilot chip sequence contiguous with the code-division-spread-spectrum communication signals.In further embodiments the communication system employs a plurality of user terminals linked to each other or to other services through one or more terrestrial or satellite repeaters. Multiple satellite repeaters are operable in a new communication mode to obtain further gains in signal isolation.

    Abstract translation: 一种使用码分扩频通信信号向多个系统用户提供高容量通信的多址，扩频通信系统和方法。 通信系统使用用于在用户通信信号之间提供边缘隔离的装置。 边缘隔离通过同时产生多个可操纵梁来提供; 使用具有极化增强的全向天线; 使用功率控制装置来响应于其输入活动水平或根据用于维持通信链路的最小允许功率来调整用户生成的通信信号的输出功率。 通信系统还可以采用用于发送与码分扩展频谱通信信号相邻的预定导频码片序列的装置。 在另外的实施例中，通信系统采用通过一个或多个地面或卫星中继器彼此链接或与其他服务相连的多个用户终端。 多个卫星中继器可以在新的通信模式下操作，以获得信号隔离的进一步增益。

Patent Agency Ranking