Invention Grant
US08774317B2 System and method for phase modulation over a pulse width modulated/amplitude modulated signal for use in a radio controlled clock receiver 失效
用于无线电控制时钟接收机的脉冲宽度调制/幅度调制信号的相位调制系统和方法

  • Patent Title: System and method for phase modulation over a pulse width modulated/amplitude modulated signal for use in a radio controlled clock receiver
  • Patent Title (中): 用于无线电控制时钟接收机的脉冲宽度调制/幅度调制信号的相位调制系统和方法
  • Application No.: US13422601
    Application Date: 2012-03-16
  • Publication No.: US08774317B2
    Publication Date: 2014-07-08
  • Inventor: Oren E. Eliezer
  • Applicant: Oren E. Eliezer
  • Applicant Address: US MI Bloomfield Hills
  • Assignee: Everset Technologies, Inc.
  • Current Assignee: Everset Technologies, Inc.
  • Current Assignee Address: US MI Bloomfield Hills
  • Agency: Woods Oviatt Gilman LLP
  • Agent Howard Zaretsky, Esq.
  • Main IPC: H03C3/00
  • IPC: H03C3/00
System and method for phase modulation over a pulse width modulated/amplitude modulated signal for use in a radio controlled clock receiver
Abstract:
A system and method for a radio controlled clock receiver adapted to extract timing and time information from a phase modulated signal. The official time signal is broadcast from a central location using a modified modulation scheme, which adds phase modulation over the legacy amplitude modulation, such as the legacy WWVB pulse width modulated (PWM)/amplitude shift keying (ASK) modulation, thereby allowing for improved performance. The information modulated onto the phase contains a known synchronization sequence having good autocorrelation properties, error-correcting coding for the time information and notifications of daylight-saving-time (DST) transitions that are provided months in advance. The modulation scheme is based on a form of phase modulation, such as binary-phase-shift-keying (BPSK) or phase reversal keying (PRK). The reception of multiple frames with repeated or sequential information allows for the accumulation of received energy over multiple frames to provide for a corresponding gain in the receiver.
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