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Clock recovery from data streams containing embedded reference clock values

a clock recovery and data stream technology, applied in the direction of digital transmission, pulse automatic control, electrical equipment, etc., can solve the problems of synch incurring a significant risk in obtaining jitter-free data reading, noise sensitive, and the technique of the pll cannot be easily modified

Inactive Publication Date: 2010-09-30
STMICROELECTRONICS PVT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables jitter-free clock recovery with adaptable characteristics, reducing the need for major redesigns and improving noise resilience in MPEG-based systems like set-top boxes and DVD systems.

Problems solved by technology

This technique does not permit easy modification of the characteristics of the PLL as there are no programmable features.
Also, the dropping of clocks during the vertical synch incurs a significant risk in obtaining jitter-free reading of data.
Finally, the implementation of this method requires major redesign of MPEG decoder circuits used in existing systems such as set-top boxes.
It is therefore sensitive to noise and its characteristics are not easily modifiable.
Further, this process needs to be implemented during the video-blanking interval and hence is limited to applications where such an interval is available.

Method used

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  • Clock recovery from data streams containing embedded reference clock values
  • Clock recovery from data streams containing embedded reference clock values
  • Clock recovery from data streams containing embedded reference clock values

Examples

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Embodiment Construction

[0037]In the following detailed description of exemplary embodiments of the invention, reference is made to the accompanying drawings, which form a part hereof. The detailed description and the drawings illustrate specific exemplary embodiments by which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It is understood that other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the present invention. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present invention.

[0038]FIG. 1 is described in the Background.

[0039]FIG. 2 shows a preferred embodiment of the invention. The PCR / ESCR from the d...

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Abstract

A method and an improved apparatus for clock recovery from data streams containing embedded reference clock values controlled clock source means includes of a controllable digital fractional divider means receiving a control value from digital comparator means and a clock input from a digital clock synthesizer means driven by a fixed oscillator means.

Description

PRIORITY[0001]This application claims priority from Indian Application for Patent No. 1084 / Del / 2001, filed Oct. 30, 2001, and entitled IMPROVED CLOCK RECOVERY FROM DATA STREAMS CONTAINING EMBEDDED REFERENCE CLOCK VALUES, which is incorporated herein by reference.TECHNICAL FIELD[0002]This invention relates to a method and an improved apparatus for clock recovery from data streams containing embedded reference clock values that uses purely digital techniques and can be incorporated without major changes in most existing applications such as MPEG based systems such as set-top boxes or DVD systems.BACKGROUND OF THE INVENTION[0003]Many applications involving streaming data, such as streaming video containing embedded reference-clock information to enable clock synchronization at the receiver. An important example of such data streams are Motion Picture Expert Group (MPEG) data streams that provide an efficient format for transmitting, receiving and storing video signals in digital format...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L7/02H03L7/099H03L7/181H04N21/43
CPCH03L7/0992H04N21/4305H03L7/181
Inventor CHAKRAVARTHY, KALYANA
Owner STMICROELECTRONICS PVT LTD