{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9697845","patent":{"patent_number":"US-9697845","title":"Non-linear echo path detection","assignee":null,"inventors":[],"filing_date":"2015-05-22T00:00:00.000Z","publication_date":"2017-07-04T00:00:00.000Z","cpc_codes":["G10L","H04M","G10L"],"num_claims":20,"abstract":"A user terminal comprising; a loudspeaker; a microphone; and an audio signal processing module comprising: a reference signal generator configured, prior to establishment of a communication event over a network with at least one further terminal, to generate and output an audio reference signal to the loudspeaker for playout; an echo removal module configured to perform echo removal on audio signals received via the microphone during the communication event; and a detector configured, prior to establishment of the communication event, to: determine characteristics of the reference signal; receive an audio signal output from the microphone which includes echo resulting from the outputted reference signal; determine characteristics of the received audio signal; compare the determined characteristics of the reference signal with determined characteristics of the received audio signal to detect a nonlinear echo path of the echo, and configure a component of the audio signal processing module based on this detection."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Non-linear echo path detection","description":"A user terminal comprising; a loudspeaker; a microphone; and an audio signal processing module comprising: a reference signal generator configured, prior to establishment of a communication event over","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9697845","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-9697845","citation_suggestion":"Patentable. \"Non-linear echo path detection\" (US-9697845). https://patentable.app/patents/US-9697845","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9697845","json":"https://patentable.app/api/llm-context/US-9697845","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:54:41.323Z"}