{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8515767","patent":{"patent_number":"US-8515767","title":"Technique for encoding/decoding of codebook indices for quantized MDCT spectrum in scalable speech and audio codecs","assignee":null,"inventors":[],"filing_date":"2008-11-03T00:00:00.000Z","publication_date":"2013-08-20T00:00:00.000Z","cpc_codes":["G10L"],"num_claims":33,"abstract":"Codebook indices for a scalable speech and audio codec may be efficiently encoded based on anticipated probability distributions for such codebook indices. A residual signal from a Code Excited Linear Prediction (CELP)-based encoding layer may be obtained, where the residual signal is a difference between an original audio signal and a reconstructed version of the original audio signal. The residual signal may be transformed at a Discrete Cosine Transform (DCT)-type transform layer to obtain a corresponding transform spectrum. The transform spectrum is divided into a plurality of spectral bands, where each spectral band having a plurality of spectral lines. A plurality of different codebooks are then selected for encoding the spectral bands, where each codebook is associated with a codebook index. A plurality of codebook indices associated with the selected codebooks are then encoded together to obtain a descriptor code that more compactly represents the codebook indices."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Technique for encoding/decoding of codebook indices for quantized MDCT spectrum in scalable speech and audio codecs","description":"Codebook indices for a scalable speech and audio codec may be efficiently encoded based on anticipated probability distributions for such codebook indices. A residual signal from a Code Excited Linear","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8515767","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-8515767","citation_suggestion":"Patentable. \"Technique for encoding/decoding of codebook indices for quantized MDCT spectrum in scalable speech and audio codecs\" (US-8515767). https://patentable.app/patents/US-8515767","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8515767","json":"https://patentable.app/api/llm-context/US-8515767","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T13:41:55.484Z"}