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
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Application No.: US13422601Application Date: 2012-03-16
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Publication No.: US08774317B2Publication 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

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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