{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8527265","patent":{"patent_number":"US-8527265","title":"Low-complexity encoding/decoding of quantized MDCT spectrum in scalable speech and audio codecs","assignee":null,"inventors":[],"filing_date":"2008-10-21T00:00:00.000Z","publication_date":"2013-09-03T00:00:00.000Z","cpc_codes":["G10L","G10L"],"num_claims":41,"abstract":"A scalable speech and audio codec is provided that implements combinatorial spectrum encoding. A residual signal is obtained from a Code Excited Linear Prediction (CELP)-based encoding layer, where the residual signal is a difference between an original audio signal and a reconstructed version of the original audio signal. The residual signal is transformed at a Discrete Cosine Transform (DCT)-type transform layer to obtain a corresponding transform spectrum having a plurality of spectral lines. The transform spectrum spectral lines are transformed using a combinatorial position coding technique. The combinatorial position coding technique includes generating a lexicographical index for a selected subset of spectral lines, where each lexicographic index represents one of a plurality of possible binary strings representing the positions of the selected subset of spectral lines. The lexicographical index represents non-zero spectral lines in a binary string in fewer bits than the length of the binary string."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Low-complexity encoding/decoding of quantized MDCT spectrum in scalable speech and audio codecs","description":"A scalable speech and audio codec is provided that implements combinatorial spectrum encoding. A residual signal is obtained from a Code Excited Linear Prediction (CELP)-based encoding layer, where th","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8527265","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-8527265","citation_suggestion":"Patentable. \"Low-complexity encoding/decoding of quantized MDCT spectrum in scalable speech and audio codecs\" (US-8527265). https://patentable.app/patents/US-8527265","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8527265","json":"https://patentable.app/api/llm-context/US-8527265","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T20:30:22.378Z"}