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    • 3. 发明授权
    • Method and apparatus for simplified tuning of a two-point modulated PLL
    • 用于简化两点调制PLL调谐的方法和装置
    • US06674331B2
    • 2004-01-06
    • US09986669
    • 2001-11-09
    • Richard L. McDowell
    • Richard L. McDowell
    • H03L700
    • H03C3/0958H03C3/0925H03C3/0933H03C3/0941
    • A method and apparatus are disclosed for tuning a voltage controlled oscillator (VCO) having two point modulation used in a phase lock loop modulation system. A loop correction voltage applied to a first modulation input of the VCO when a first modulation signal, e.g., +1, is applied to a second modulation input of the VCO is compared to a loop correction voltage applied to the first modulation input when a second modulation signal, e.g., −1, is applied to the second modulation input of the VCO. The comparison produces a correction signal used to adjust the signal level of at least one of the signals, e.g., the second modulation input signal, applied to the two modulation inputs of the VCO.
    • 公开了一种用于调谐在锁相环调制系统中使用的具有两点调制的压控振荡器(VCO)的方法和装置。 当施加到VCO的第二调制输入端的第一调制信号(例如+1)施加到VCO的第一调制输入端的环路校正电压与施加到第一调制输入的环路校正电压进行比较,当第二调制信号 调制信号(例如-1)被施加到VCO的第二调制输入。 比较产生用于调整施加到VCO的两个调制输入端的至少一个信号(例如,第二调制输入信号)的信号电平的校正信号。
    • 6. 发明授权
    • Fine-stage automatic frequency compensation in post-detection short-range wireless applications
    • 检测后短距离无线应用中的微步自动频率补偿
    • US06934524B2
    • 2005-08-23
    • US10131214
    • 2002-04-25
    • Eric John HansenWenzhe LuoZhigang MaRichard L. McDowell
    • Eric John HansenWenzhe LuoZhigang MaRichard L. McDowell
    • H04L12/56H04L27/00H04L27/16H04L27/233H04B1/26
    • H04L27/2332H04L27/16H04L2027/0046H04L2027/0065H04W24/00H04W84/18
    • A data-pattern feedback mechanism is introduced into the peak detection process of an automatic frequency compensation system in a Gaussian Frequency Shift Keying (GFSK) modulated system, providing fast and accurate fine-stage automatic frequency compensation (AFC). Maximum positive and negative peak registers are updated with new values as necessary based on detection during a sequence of identical binary bit values (e.g., during a “00” for detection of maximum negative peak frequency, or during a “11” for detection of maximum positive peak frequency), in a particular data frame. As soon as an initial value is determined for both the maximum positive and negative peak frequencies (e.g., after the first occurrence of a “11” and a “00”, in any order), fine-stage automatic frequency compensation can be initiated. Subsequent adjustments to the VCO of the local oscillator will further refine the frequency offset towards the ideal of zero. Quick determination of the maximum positive and negative peak frequencies is made based on data pattern feedback in accordance with the principles of the present invention, allowing for a fast and accurate fine-stage automatic frequency compensation adjustment of a local oscillation clock signal.
    • 在高斯频移键控(GFSK)调制系统的自动频率补偿系统的峰值检测过程中引入了数据模式反馈机制,提供了快速准确的微步自动频率补偿(AFC)。 最大正和负峰值寄存器根据相同的二进制位值序列之前的检测(例如,在用于检测最大负峰值频率的“00”期间或在用于检测最大负峰值频率的“11”期间的检测 正峰值频率),在特定数据帧中。 一旦确定了最大正峰值和负峰值频率的初始值(例如,在第一次出现“11”和“00”之后,以任何顺序),可以开始精细级自动频率补偿。 对本地振荡器的VCO的后续调整将进一步细化朝向理想值零的频率偏移。 基于根据本发明的原理的数据模式反馈来快速确定最大正峰值和负峰值频率,允许对本地振荡时钟信号进行快速和准确的精细级自动频率补偿调整。
    • 7. 发明授权
    • Clock synchronization between wireless devices during cradled time
    • 无线设备之间的时钟同步
    • US06587694B1
    • 2003-07-01
    • US09404807
    • 1999-09-24
    • Philip D. MooneyRichard L. McDowellJeffrey P. GrundvigJian Wu
    • Philip D. MooneyRichard L. McDowellJeffrey P. GrundvigJian Wu
    • H04L2730
    • H04M1/72502
    • Clocks between at least two wireless devices are synchronized to reduce the need to transmit synchronization signals over a wireless communication channel therebetween. Two wireless devices synchronize their respective clocks with each other when each are electrically coupled, e.g., during a cradle time when brought into physical contact with each other through charge contacts, e.g., to recharge a remote portable unit. The charge signal appearing at the charge contacts is driven to create a time duration marked by a start transition and an end transition in the charge signal. The number of clock pulses of each of the two wireless devices during the time duration is counted, and compared to determine the difference in clock speeds of the wireless devices. The frequency of the clock of at least one of the wireless devices is adjusted to bring the difference in the clock speeds within a predetermined threshold tolerance level.
    • 在至少两个无线设备之间的时钟被同步以减少通过它们之间的无线通信信道发送同步信号的需要。 两个无线设备在每个电耦合时使其各自的时钟彼此同步,例如在通过充电触点进行物理接触的支架时间期间,例如为远程便携式单元充电。 驱动出现在充电触点处的充电信号以产生由充电信号中的开始转换和结束转换所标记的持续时间。 对持续时间内的两个无线设备中的每一个的时钟脉冲数进行计数,并进行比较以确定无线设备的时钟速度的差异。 调整至少一个无线设备的时钟的频率以使时钟速度的差异在预定的阈值容差水平内。
    • 9. 发明授权
    • Intelligent software controlled correction of frequency tracking for a local oscillator of a receiver of a wireless device
    • US06721372B1
    • 2004-04-13
    • US09527289
    • 2000-03-17
    • Somnath BanikJeffrey P. GrundvigRichard L. McDowellCarl R. Stevenson
    • Somnath BanikJeffrey P. GrundvigRichard L. McDowellCarl R. Stevenson
    • H04L2706
    • H04M1/73H03J1/0058H03J7/02H04L7/0331H04M1/72502
    • A method and apparatus to perform a real-time drift correction of a local oscillator in a wireless device such as a cordless telephone, and/or to perform software-based frequency tracking of the local oscillator. With respect to the real-time drift correction, the remote handset periodically wakes from a sleep mode and goes into a normal link verification mode. Once in the link verification mode, the remote handset enters a time division duplexing (TDD) mode and attempts to establish a link with a base unit based on the timing of the TDD data frame. After the remote handset establishes a link with the base unit, the remote handset requests a security word from the base unit. Upon receiving the requested security word, the remote handset determines if the requested security word matches a security word of the remote handset. The remote handset implements a software frequency adjustment of its local oscillator. Once per frame, the remote handset enters a timing recovery state where the current state of the frame is compared with a previous state. When the cumulative timing slip is greater than a designated threshold, a frequency adjustment is made. The remote handset continuously adjusts its local oscillator to achieve frequency alignment within, e.g., 1 part per million (ppm). Alternatively, frequency alignment may be achieved to a specified value. Frequency feedback control may be software based to allow frequency tracking between two remote points in a communication system. In this way, the desirability of any frequency correction at particular times may be based on the accuracy of the recovered timing and data, the sensitivity of the mode of the receiving device, etc. For instance, the frequency can be finely adjusted during system acquisition, can be coarsely adjusted during data transfer, and/or can be programmed to essentially ignore or disregard a frequency offset which would otherwise be determined based on erroneously received data and/or timing (e.g., based on frame error information).
    • 10. 发明授权
    • Real-time slow drift correction of alignment of handset's local oscillator for cordless telephone
    • 用于无绳电话的手机本地振荡器对准的实时慢漂移校正
    • US06650874B1
    • 2003-11-18
    • US09447286
    • 1999-11-23
    • Somnath BanikJoseph M. CannonEric J. DiethornJeffrey P. GrundvigJames A. JohansonRichard L. McDowellPhilip D. MooneyJian Wu
    • Somnath BanikJoseph M. CannonEric J. DiethornJeffrey P. GrundvigJames A. JohansonRichard L. McDowellPhilip D. MooneyJian Wu
    • H04B100
    • H04M1/727H04L7/0083H04L7/0331H04M1/72505
    • A method and apparatus to perform a real-time drift correction of a remote handset's local oscillator in a digital cordless telephone. The remote handset begins in a standby (sniff) mode. The remote handset periodically wakes from a sleep mode and goes into a normal link verification mode. Once in the link verification mode, the remote handset enters a time division duplexing (TDD) mode and attempts to establish a link with a base unit based on the timing of the TDD data frame. After the remote handset establishes a link with the base unit, the remote handset requests a security word from the base unit. Upon receiving the requested security word, the remote handset determines if the requested security word matches a security word of the remote handset. The remote handset implements a software frequency adjustment of its local oscillator. Once per frame, the remote handset enters a timing recovery state where the current state of the frame is compared with a previous state. When the cumulative timing slip is greater than a designated threshold, a frequency adjustment is made. During this exchange of commands between the remote handset and base unit, the remote handset continuously adjusts its local oscillator to achieve frequency alignment within, e.g., 1 part per million (ppm). Alternatively, frequency alignment may be achieved to a specified value.
    • 一种用于在数字无绳电话中执行远程手机的本地振荡器的实时漂移校正的方法和装置。 远程手机开始处于待机(嗅探)模式。 远程手机周期性地从休眠模式唤醒并进入正常的链路验证模式。 一旦处于链路验证模式,远程手机进入时分双工(TDD)模式,并尝试基于TDD数据帧的定时建立与基本单元的链路。 在远程手机与基本单元建立链接之后,远程手机从基本单元请求安全字。 在接收到所请求的安全字时,远程手机确定所请求的安全字是否与远程手机的安全字匹配。 远程手机实现其本地振荡器的软件频率调整。 每帧一次,远程手机进入定时恢复状态,其中帧的当前状态与先前状态进行比较。 当累积定时滑差大于指定的阈值时,进行频率调整。 在远程手机和基站单元之间的这种命令交换期间,远程手持机连续地调整其本地振荡器以实现例如百万分之一(ppm)内的频率对准。 或者,可以将频率对准实现为指定值。