Invention Grant
US08984321B2 Jitter reduction method and apparatus for synchronised USB devices
有权
用于同步USB设备的抖动降低方法和装置
- Patent Title: Jitter reduction method and apparatus for synchronised USB devices
- Patent Title (中): 用于同步USB设备的抖动降低方法和装置
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Application No.: US13321707Application Date: 2010-05-20
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Publication No.: US08984321B2Publication Date: 2015-03-17
- Inventor: Peter Graham Foster , Alex Kouznetsov
- Applicant: Peter Graham Foster , Alex Kouznetsov
- Applicant Address: AU Adelaide South Australia
- Assignee: Chronologic Pty, Ltd.
- Current Assignee: Chronologic Pty, Ltd.
- Current Assignee Address: AU Adelaide South Australia
- Agency: Oliff PLC
- International Application: PCT/AU2010/000604 WO 20100520
- International Announcement: WO2010/132943 WO 20101125
- Main IPC: G06F1/00
- IPC: G06F1/00 ; G06F1/08 ; G06F1/12 ; G06F13/40 ; G06F13/42 ; H04L7/04 ; H04L7/08
Abstract:
A method of reducing jitter in a local clock of a synchronised USB device attached to a USB Hub, the USB Hub having a local clock and repeater circuitry, comprising: observing a USB data stream with the USB Hub, the data stream having a data stream bit rate; the USB Hub decoding a periodic signal structure in the USB data stream; the USB Hub generating an event signal in response to decoding of the periodic signal structure; and the USB Hub locking a frequency of the local clock of the USB Hub to the periodic event signal. The local clock of the USB Hub is adapted to be a clocking source for the repeater circuitry of the USB Hub at substantially an integer multiple of a frequency of the data stream bit rate.
Public/Granted literature
- US20120131374A1 JITTER REDUCTION METHOD AND APPARATUS FOR DISTRIBUTED SYNCHRONISED CLOCK ARCHITECTURE Public/Granted day:2012-05-24
Information query
