Unlock instant, AI-driven research and patent intelligence for your innovation.

Anomalous waveform detection circuit and information reproducing device

一种异常波形、检测电路的技术，应用在信息存储、记录信息存储、数字信号错误检测/纠正等方向，能够解决模拟再生信号宽频带化和杂波减弱、不易检测异常波形信号等问题

Inactive Publication Date: 2005-09-21
PANASONIC CORP
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the analog method of detecting abnormal waveform signals with analog reproduced signals is mainly used. The problems of this method are: the broadbandization of analog reproduced signals and the weakening of clutter, it is difficult to detect abnormal waveform signals correctly, and an external device, making the circuit larger

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Anomalous waveform detection circuit and information reproducing device
  • Anomalous waveform detection circuit and information reproducing device
  • Anomalous waveform detection circuit and information reproducing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] figure 1 Shown is a block diagram of the main structure of the abnormal waveform detection circuit in the first embodiment. In addition, with Picture 12 The components in which each component plays the same role are represented by the same symbols, and the description thereof is omitted.

[0030] figure 1 Here, the abnormal waveform detection circuit 1 includes: a detection unit 11 that generates an abnormal waveform determination signal from an input digital reproduction signal; and a counting unit 12 that generates an abnormal waveform detection signal from an input abnormal waveform determination signal. Digitally detect whether the analog reproduced signal cycled by the optical disc has an abnormal waveform. Here, the abnormal waveform is as described later image 3 As shown, there are two cases where the upper part of the analog reproduction signal waveform decreases together with the time course, and the case where the lower part of the signal waveform increases ...

Embodiment 2

[0046] Figure 4 It is a block diagram of the main structure of the detection unit in the abnormal waveform detection circuit in the second embodiment. In addition, with figure 1 with figure 2 Components in which each component plays the same role are represented by the same symbols, and their description is omitted.

[0047] in Figure 4 Here, the abnormal waveform detection circuit 2 includes: a detection unit 21 that generates an abnormal waveform determination signal from an input reproduced signal; and a counting unit 12 that generates an abnormal waveform detection signal from an input abnormal waveform determination signal. The abnormal waveform detection circuit 2 detects whether the analog reproduction signal read from the optical disc has an abnormal waveform.

[0048] The detection unit 21 includes: a comparison circuit 111; a delay circuit 112; an "exclusive" circuit 213 as a coincidence circuit; and a "not" circuit 114. Detection unit 21 and figure 2 The differenc...

Embodiment 3

[0052] Figure 5 It is a block diagram of the main structure of the counting unit in the abnormal waveform detection circuit in the third embodiment. In addition, with figure 1 with figure 2 Components in which each component plays the same role are represented by the same symbols, and their description is omitted.

[0053] in Figure 5 Here, the abnormal waveform detection circuit 3 includes: a detection unit 21 (or detection unit 11) that generates an abnormal waveform determination signal from an input digital reproduction signal; and a counting unit 32 that generates an abnormal waveform detection signal from an input abnormal waveform determination signal. The abnormal waveform detection circuit 3 detects whether the analog reproduction signal read from the optical disc is an abnormal waveform.

[0054] The counting unit 32 includes a counter 321 that counts the time course of the abnormal waveform determination signal, and a detection signal generation unit 322 that gener...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An unusual waveform detection circuit of the present invention is a digital-type unusual waveform detection circuit that arbitrarily sets a threshold used for determining an unusual waveform and produces an unusual waveform determination signal by comparing an input signal with the threshold. In producing the unusual waveform determination signal, one of a configuration where a voltage at each of all sampling points is compared with a reference voltage and a configuration where a continuously changing gradient of signal waveform peaks is calculated and is compared with a reference gradient is selectively employed. The unusual waveform detection circuit can easily and accurately detect various unusual waveforms.

Description

Technical field [0001] The present invention relates to an abnormal waveform detection circuit, which is used to detect abnormal reproduction waveforms generated on recording media represented by optical disks or magnetic disks due to defects in recording grooves or positional deviation of a reading device. Processing this waveform can minimize the adverse effects on the later signal processing. Background technique [0002] Picture 12 Shown is an example of an abnormal waveform detection circuit of a defect detection circuit in a conventional optical disc device, which includes a reproduction signal processing circuit system of an information reproduction device. [0003] Picture 12 In the optical disc device, the reproduction signal processing circuit 100 includes: an optical pickup 102 that reads a recorded signal from the recording medium 101; a preamplifier 103 that performs a pre-amplification process on the signal output from the optical pickup 102; and outputs the pre...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/10G11B20/18
CPCG11B20/18G11B20/10
Inventor 河边章永野孝一
Owner PANASONIC CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com