Title:
METHOD AND APPARATUS FOR SETTING A VOLTAGE CONTROLLED CRYSTAL OSCILLATOR IN A VIDEO PROCESSING DEVICE
Document Type and Number:
WIPO Patent Application WO2005084037
Kind Code:
A3
Abstract:
The present invention concerns a method and apparatus for setting a frequency reference in an integrated receiver decoder (IRD). More specifically, the present invention discloses an electrical circuit arrangement in which the voltage controlled crystal oscillator (VCXO) is set to oscillate at the desired frequency prior to the initial use thereof and that frequency is stored in a non-volatile memory unit. Upon initial use, the IRD receives a data signal corresponding to a frequency reference. The IRD uses a threshold value to compare the frequency reference of the incoming data signal with the frequency stored in the non-volatile memory. If the frequencies differ by a predetermined value, the frequency from the incoming data signal is stored in the non-volatile memory and is used to set the VCXO.
Inventors:
SIRILLA GEORGE ANDREW (US)
PITSCH ROBERT ALAN (US)
PITSCH ROBERT ALAN (US)
Application Number:
PCT/US2005/006252
Publication Date:
November 10, 2005
Filing Date:
February 25, 2005
Export Citation:
Assignee:
THOMSON LICENSING SA (FR)
SIRILLA GEORGE ANDREW (US)
PITSCH ROBERT ALAN (US)
SIRILLA GEORGE ANDREW (US)
PITSCH ROBERT ALAN (US)
International Classes:
H03L1/02; H04N7/62; (IPC1-7): H04N7/62; H03L1/02
Foreign References:
| US5612981A | 1997-03-18 | |||
| EP1324619A2 | 2003-07-02 | |||
| US20030005348A1 | 2003-01-02 | |||
| US6356871B1 | 2002-03-12 |
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