Synchronization signal detecting circuit and detecting method

A technology of synchronous signal and circuit, applied in synchronous signal speed/phase control, synchronous device, optical recording/reproduction, etc., can solve the problem of insufficient precision and achieve the effect of improving the readout ability

Inactive Publication Date: 2007-08-01
NEC ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when SY0 detection fails, sector data is reproduced based on sy0cmp_out, and sy0cmp_out may not be accurate enough (timing accuracy)

Method used

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  • Synchronization signal detecting circuit and detecting method
  • Synchronization signal detecting circuit and detecting method
  • Synchronization signal detecting circuit and detecting method

Examples

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Embodiment

[0110] 8 is a diagram showing a configuration of a detection circuit of SY0 of a sync signal (a sync signal serving as a sector head of a DVD-RAM) according to an embodiment of the present invention. FIG. 9 is a diagram showing the configuration of the SY0 detection and determination circuit 30 .

[0111] In FIG. 8 and FIG. 9, the signal indicating the detection level of the present invention is detect_level_signal, the detection of the 14T pattern of the synchronization signal SY0 at the beginning of the sector is indicated by sync0_detect_signal, and the sunc0_timing_reset_signal indicates the data acquisition timing of the serial data. the resynchronization signal.

[0112] read_data is the serial data input from the read channel (also called read channel data). The header area detection circuit of the circuit block 10 outputs a sync detection window sync0_detect_window (sy0win) for sector head detection expected from the header of the serial data. The header area detecti...

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Abstract

A synchronization detection circuit in which serial data received is collated to a predetermined matching pattern in a synchronization detection window to generate a detection level having a value corresponding to the degree of conformity to the matching pattern and in case a pattern is detected, whose detection level exceeds a preset threshold value, the pattern so detected is indicative of a synchronization signal. During the time before detection of the synchronization signal pattern, the maximum value of past detection level is retained. In case a pattern of the detection level of a value higher than the maximum value, as retained, is detected, the past detection level is updated and the detection of the pattern corresponding to the detection level of the higher value is considered to indicate detection of a provisional synchronization signal. Accordingly, a reset signal for re-synchronization of data take-in timing is output.

Description

technical field [0001] The present invention relates to a synchronous signal detection circuit and method, in particular to a circuit and method suitable for synchronous detection of recording and reproducing devices. Background technique [0002] For an overview of the synchronization signal detection circuit, for example, the descriptions in Patent Document 1 and the like can be referred to. For the general situation of DVD-RAM, for example, the descriptions in Patent Document 2 and the like can be referred to. [0003] FIG. 13 shows the configuration of a conventional synchronization signal detection circuit. It has a read channel for extracting a bit signal from a signal read from an optical disc; a circuit block 10' consisting of a header area detection circuit for detecting a Header area; and detecting a preamble PS from the serial data read_data PS / SYNC pattern detection circuit 20' of / SY0; SY0 detection judgment circuit 30'; and circuit block 40' having SYNC windo...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G11B20/10G11B7/09G11B7/00
CPCH04L7/042G11B7/00G11B20/10G11B20/14H04L7/08
Inventor新江裕之
OwnerNEC ELECTRONICS CORP