Title:
信号源数の推定方法、推定装置、推定プログラム及び記録媒体
Document Type and Number:
Japanese Patent JP4113169
Kind Code:
B2
Abstract:
To estimate correctly the number of signal sources in an actual environment.
A frequency domain conversion part 20 converts observation signals xj(t) (j=ä1, ..., M}) into time series data Xj(f, τ) of each frequency, and a signal separation part 31 generates separation signals Yi(f, τ) from the time series data Xj(f, τ) and stores them in a memory 10. Then, a power calculation part 32 determines a power value of each separation signal Yi(f, τ) and stores it in the memory, and an envelope correlation calculation part 33 calculates an envelope correlation value to the time difference Δτ between different separation signals Yi(f, τ) and stores it in the memory. A determination part 34 compares the power value and the envelope correlation value of each separation signal Yi(f, τ) with parameters thnoise, threvand thcorshowing each threshold of a reverberation level and the envelope correlation value, and determines whether the separation signal Yi(f, τ) is a source signal component or not.
COPYRIGHT: (C)2006,JPO&NCIPI
Inventors:
Hiroshi Sawada
Ryo Mukai
Akiko Araki
Shoji Makino
Application Number:
JP2004238174A
Publication Date:
July 09, 2008
Filing Date:
August 18, 2004
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G01H3/00; G10L21/02; G01S3/74; G10L15/20
Domestic Patent References:
| JP2003270034A | | | | |
| JP2004145172A | | | | |
| JP9258788A | | | | |
| JP10300730A | | | | |
| JP11101684A | | | | |
Attorney, Agent or Firm:
Naoki Nakao
Taku Kusano
Yukio Nakamura
Minoru Inagaki
