{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8476978","patent":{"patent_number":"US-8476978","title":"Headphone driver/charge pump combination","assignee":null,"inventors":[],"filing_date":"2008-09-08T00:00:00.000Z","publication_date":"2013-07-02T00:00:00.000Z","cpc_codes":["H04R"],"num_claims":13,"abstract":"A headphone driver amplifier operative without an external negative voltage power supply, coupled directly to the headphone speakers without the need for DC coupling capacitors used for preventing DC reaching the headphones. An onboard power supply generates a negative voltage rail which powers the output amplifiers, allowing driver amplifier operation from both positive and negative rails. Since the amplifiers can be biased at ground potential (O volts), no significant DC voltage exists across the speaker load and the need for DC coupling capacitors is eliminated."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Headphone driver/charge pump combination","description":"A headphone driver amplifier operative without an external negative voltage power supply, coupled directly to the headphone speakers without the need for DC coupling capacitors used for preventing DC ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8476978","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-8476978","citation_suggestion":"Patentable. \"Headphone driver/charge pump combination\" (US-8476978). https://patentable.app/patents/US-8476978","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8476978","json":"https://patentable.app/api/llm-context/US-8476978","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T05:13:58.559Z"}