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Device and method for reproducing digital information signal

A digital information and signal technology, applied in signal processing, information storage, recording signal processing, etc. using self-timed codes, and can solve problems such as errors

Inactive Publication Date: 2004-10-13
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bit slip errors thus causing errors in the signal until the next sync word

Method used

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  • Device and method for reproducing digital information signal
  • Device and method for reproducing digital information signal
  • Device and method for reproducing digital information signal

Examples

Experimental program
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Embodiment Construction

[0024] figure 1 Demonstrate the device for transforming a (d, k) sequence into a (d-1, k-1) sequence by removing 0s from the 0 array, which occurs each time between two consecutive 1s in the (d, k) sequence . However, the present invention is not limited to (d-1, k-1) sequences. The invention can equally be applied to (2,8) constraint codes transformed from (1,7) constraint codes.

[0025] Information on stroke-restricted sequences can be found, for example, in US Pat. Coding Techniques for Digital Recorders", §5.1.

[0026] Sequence S 1 is applied to input 2 of the device. figure 1 Show a signal S with a d constraint equal to 2 1 , because the number of 0s between the fourth and fifth 1s in the sequence is 2. Because of the transformation, the sequence S 2 has been obtained. From figure 1 It can be obtained that in the sequence S 2 The number of 0's between successive 1's has been reduced by one each time. Therefore, the signal S 2 is a sequence of (d-1, k-1) con...

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Abstract

The invention relates to a device for reproducing a digital information signal from a channel signal. The digital information signal is runlength limited with one or more constraints. The device comprises receiving means for receiving the channel signal and means for comparing a detected runlength with a predetermined value indicative of a minimum runlength constraint or a maximum runlength constraint of the channel signal and for generating a control signal when the detected runlength violates said constraint. The device further comprises substitute means for in response to the control signal deleting or inserting an element in the channel signal. The invention also relates to an associated method for reproducing a digital information signal from a channel signal.

Description

technical field [0001] The invention relates to apparatus for reproducing a digital information signal from a channel signal, the digital information signal being bounded by one or more constraints. The device comprises receiving means for receiving channel signals. [0002] The invention also relates to a method for reproducing a digital information signal from a channel signal. Background technique [0003] The present invention is in the field of channel coding, in particular of run-length limited channel coding. It is well known that usually the length of time between successive transformations, expressed in channel bits, is called a run. (d,k) sequences are characterized by two parameters, d-constraint and k-constraint. So this (d, k) sequence satisfies the following two conditions: due to the d-constraint, two logical "1"s are separated by a sequence of at least d consecutive "0"s; due to the k-constraint, two logical "1"s are separated by a sequence of At most k c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/10G11B20/14H03M5/14H03M7/14H03M13/31
CPCH03M5/14G11B20/14H03M13/31H03M5/145G11B20/1426G11B20/10
Inventor J·A·H·M·卡尔曼W·M·J·M·科尼
Owner KONINKLIJKE PHILIPS ELECTRONICS NV