{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8498188","patent":{"patent_number":"US-8498188","title":"Target level setting method for a signal used in maximum-likelihood decoding in PRML processing of a signal reproduced from an optical information recording medium, playback device for an optical information recording medium, and target level setting program for a signal used in maximum-likelihood decoding in PRML processing","assignee":null,"inventors":[],"filing_date":"2009-02-26T00:00:00.000Z","publication_date":"2013-07-30T00:00:00.000Z","cpc_codes":["G11B","G11B","G11B","G11B","G11B","G11B","G11B","G11B","G11B","G11B","G11B","G11B","G11B"],"num_claims":14,"abstract":"Target levels in the PRML method are adaptively set under conditions of simplicity and a low cost. A method of setting a target level for reproduction of an optical information recording medium includes: a step of producing a reproduction signal from reflected light of laser light irradiated to an optical information recording medium; a step of performing waveform equalization processing, which depends on a predetermined partial response characteristic, on the reproduction signal to produce a waveform-equalized reproduction signal; a step of detecting peak levels for marks and spaces of a predetermined number of symbols from the waveform-equalized reproduction signal irrespective of a condition for a symbol adjoining each symbol; and a setting step of determining and setting values of a plurality of target levels, which is employed in Viterbi decoding and is arrayed with non-equal intervals among them, on the basis of a relative relationship among the detected peak levels."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Target level setting method for a signal used in maximum-likelihood decoding in PRML processing of a signal reproduced from an optical information recording medium, playback device for an optical information recording medium, and target level setting program for a signal used in maximum-likelihood decoding in PRML processing","description":"Target levels in the PRML method are adaptively set under conditions of simplicity and a low cost. A method of setting a target level for reproduction of an optical information recording medium includ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8498188","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8498188","citation_suggestion":"Patentable. \"Target level setting method for a signal used in maximum-likelihood decoding in PRML processing of a signal reproduced from an optical information recording medium, playback device for an optical information recording medium, and target level setting program for a signal used in maximum-likelihood decoding in PRML processing\" (US-8498188). https://patentable.app/patents/US-8498188","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8498188","json":"https://patentable.app/api/llm-context/US-8498188","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T19:52:29.274Z"}