{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9691403","patent":{"patent_number":"US-9691403","title":"Spectral translation/folding in the subband domain","assignee":null,"inventors":[],"filing_date":"2017-03-01T00:00:00.000Z","publication_date":"2017-06-27T00:00:00.000Z","cpc_codes":["G10L","G10L","G10L","G10L","G10L","G10L"],"num_claims":8,"abstract":"The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems, and offers significantly reduced computational complexity. This is accomplished by means of frequency translation or folding in the subband domain, preferably integrated with spectral envelope adjustment in the same domain. The concept of dissonance guard-band filtering is further presented. The proposed invention offers a low-complexity, intermediate quality HFR method useful in speech and natural audio coding applications."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Spectral translation/folding in the subband domain","description":"The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The propo","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9691403","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-9691403","citation_suggestion":"Patentable. \"Spectral translation/folding in the subband domain\" (US-9691403). https://patentable.app/patents/US-9691403","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9691403","json":"https://patentable.app/api/llm-context/US-9691403","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T04:40:09.525Z"}