{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9787825","patent":{"patent_number":"US-9787825","title":"Cyclically variable signal delays for acoustic echo cancellation","assignee":null,"inventors":[],"filing_date":"2015-06-30T00:00:00.000Z","publication_date":"2017-10-10T00:00:00.000Z","cpc_codes":["H04M"],"num_claims":20,"abstract":"A multi-channel audio communication system is configured to receive highly correlated input audio signals, generated as an example by multiple microphones at a far-end site. Each input audio signal is cyclically stepped through a range of discrete delay amounts, between upper and lower limits, using a step size that is a fraction of the sample period of the input audio signals. Delay cycles applied to the different input audio signals are configured to have different phases, thereby reducing the inter-signal correlation of the input audio signals. The delayed input audio signals are then played by loudspeakers. Microphone output, which may contain sound generated by the loudspeakers, is then subjected to multi-channel acoustic echo cancellation."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Cyclically variable signal delays for acoustic echo cancellation","description":"A multi-channel audio communication system is configured to receive highly correlated input audio signals, generated as an example by multiple microphones at a far-end site. Each input audio signal is","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9787825","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-9787825","citation_suggestion":"Patentable. \"Cyclically variable signal delays for acoustic echo cancellation\" (US-9787825). https://patentable.app/patents/US-9787825","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9787825","json":"https://patentable.app/api/llm-context/US-9787825","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T07:17:09.787Z"}