Speech coding transmission equipment
Patent 4890325 Issued on December 26, 1989. Estimated Expiration Date: 
February 18, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 18, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAdaptive prediction Speech sampling and companding device Hybrid subband coder/decoder method and apparatus Patent #: 4622680 InventorsApplicationNo. 156882 filed on 02/18/1988US Classes:704/208Voiced or unvoicedExaminersPrimary: Kemeny, Emanuel S.Attorney, Agent or FirmInternational ClassG10L 005/00Foreign Application Priority Data1987-02-20 JPAbstractSpeech is data-compressed and coded for transmission using TDHC (Time Domain Harmonic Compression) for the voiced signal, and decimated sampling for the unvoiced signal. Features include voiced/unvoiced detection, pitch period detection, border detection, coding by ADPCM, and optimum quantization coding. Reception involves decoding and data-reconstruction. | |
