Title:
【発明の名称】電話での音声信号のサンプルから音声歪みを測定するための方法およびシステム
Document Type and Number:
Japanese Patent JP2002544747
Kind Code:
A
Abstract:
A system that provides measurements of speech distortion that correspond closely to user perceptions of speech distortion is provided. The system calculates and analyzes first and second discrete derivatives to detect and determine the incidence of change in the voice waveform that would not have been made by human articulation because natural voice signals change at a limited rate. Statistical analysis is performed of both the first and second discrete derivatives to detect speech distortion by looking at the distribution of the signals. For example, the kurtosis of the signals is analyzed as well as the number of times these values exceed a predetermined threshold. Additionally, the number of times the first derivative data is less than a predetermined low value is analyzed to provide a level of speech distortion and clipping of the signal due to lost data packets.
Inventors:
William Sea Hardy
Application Number:
JP2000618972A
Publication Date:
December 24, 2002
Filing Date:
May 17, 2000
Export Citation:
Assignee:
MCI Worldcom Inc.
International Classes:
H04M1/24; G10L19/00; (IPC1-7): H04M1/24
Attorney, Agent or Firm:
Masatake Shiga (7 outside)