{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9589572","patent":{"patent_number":"US-9589572","title":"Stepsize determination of adaptive filter for cancelling voice portion by combining open-loop and closed-loop approaches","assignee":null,"inventors":[],"filing_date":"2015-05-02T00:00:00.000Z","publication_date":"2017-03-07T00:00:00.000Z","cpc_codes":["G10L","G10L"],"num_claims":8,"abstract":"In accordance with an embodiment of the present invention, a noise reduction method for speech processing includes estimating a noise/interference component signal by subtracting voice component signal from a first microphone input signal wherein the voice component signal is evaluated as a first replica signal produced by passing a second microphone input signal through a first adaptive filter; a stepsize is estimated to control adaptive update of the first adaptive filter, wherein the stepsize is evaluated by combing an open-loop approach and a closed-loop approach, the open-loop approach comprising voice/noise/interference classification and SNR estimation in voice area, and the closed-loop approach comprising calculating a normalized correlation between the first replica signal and the first microphone input signal. A noise/interference reduced signal is outputted by subtracting a second replica signal from a target signal which is the first microphone input signal or the second microphone input signal, wherein the second replica signal is produced by passing the estimated noise/interference component signal through a second adaptive filter."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Stepsize determination of adaptive filter for cancelling voice portion by combining open-loop and closed-loop approaches","description":"In accordance with an embodiment of the present invention, a noise reduction method for speech processing includes estimating a noise/interference component signal by subtracting voice component signa","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9589572","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-9589572","citation_suggestion":"Patentable. \"Stepsize determination of adaptive filter for cancelling voice portion by combining open-loop and closed-loop approaches\" (US-9589572). https://patentable.app/patents/US-9589572","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9589572","json":"https://patentable.app/api/llm-context/US-9589572","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:33:17.233Z"}