Title:
【発明の名称】ピッチ変化検出を伴なう誤り訂正方法
Document Type and Number:
Japanese Patent JP2003522981
Kind Code:
A
Abstract:
An error concealment method is for improving the speech signal quality at the receiving end in speech transmission systems is described particularly, it relates to a method of receiving speech signals which have been encoded through speech parameters before transmission via a transmission channel, the method comprising an error detection step, using parameter statistics, of detecting corrupted parameters among received parameters and a speech decoding step of decoding the received parameters and retrieving the transmitted speech signal. Depending on the calculation process performed by the speech coder for generating the speech parameters, a pitch doubling/halving of the parameter values may occur during speech parameter coding. Although this phenomenon has no consequence for the received signal quality, it may cause a misdetection by error concealment methods using parameter statistics. According to the invention, the error detection step performs a pitch doubling/halving detection to verify if received speech parameters, which occur to have a value within a range relatively far beyond previous received parameters, are really corrupted, or if this different range simply results from a pitch doubling/halving of the parameter values produced during speech parameter coding.
Inventors:
John Cool, Yang
Application Number:
JP2001559001A
Publication Date:
July 29, 2003
Filing Date:
January 22, 2001
Export Citation:
Assignee:
Konin Krekka Philips Electronics NV
International Classes:
G10L19/00; G10L19/005; G10L19/08; G10L25/90; G11B20/18; H03M13/00; H03M13/29; H04B14/04; H04L1/00; G10L21/013; (IPC1-7): G10L19/00; G10L11/04; H03M13/29; H04B14/04; H04L1/00
Attorney, Agent or Firm:
Tadahiko Ito