Apparatus and method for coding excitation parameters in a very low bit rate voice messaging system
Patent 5666350 Issued on September 9, 1997. Estimated Expiration Date: 
February 20, 2016. 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 20, 2016. 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 ReferencesSignal synthesizer spectrum contour scaler Speech parameter encoding method capable of transmitting a spectrum parameter at a reduced number of bits Voice encoding method and voice decoding method Patent #: 5473727 InventorsAssigneeApplicationNo. 603677 filed on 02/20/1996US Classes:370/435, TASI (Time Assignment Speech Interpolation)704/203, Transformation704/207, Pitch704/208Voiced or unvoicedExaminersPrimary: Olms, Douglas W.Assistant: Bnimoussa, Abdeliamid Attorney, Agent or FirmInternational ClassH04J 003/17AbstractAn apparatus codes excitation parameters for very low bit rate voice messaging using a method that processes a voice message to generating speech parameters. The speech parameters are separated (316) to produce a first group of energy parameters and a second group of pitch and voicing parameters. Subsequently, the first group of energy parameters are encoded and compressed using a non-uniform root-mean-square scalar process (318) to create a first plurality of encoded data. Additionally, the second group of pitch and voicing parameters are compressed, encoded, and combined into a single parameter using a three slope vector encoding process (320) that creates a second plurality of encoded data. Finally, the first and second plurality of encoded data are multiplexed (322) to create a multiplexed signal for transmission, the multiplexed signal representing the voice message. | |
