Title:
エコー抑制装置及びエコー打消装置の非直線的プロセッサ
Document Type and Number:
Japanese Patent JP4090505
Kind Code:
B2
Abstract:
The invention relates to an acoustic echo suppressor and a non-linear processor for an echo canceller in a 4-wire data transmission network. An echo canceller is typically controlled by comparing the power levels of the near-end and far-end signals. The transfer function of an acoustic echo path is usually very non-uniform. According to the invention, the spectrum of the far-end signal is treated, before the signal power level is calculated, with a weighted filter, which models the effect of the transfer function of acoustic echo. As a result, the double talk dynamics is improved, since high-energy vowels of far-end speech, which normally cause low-energy vowels of near-end speech to be clipped in an echo suppresseor, will be attenuated.
Inventors:
Kirla Auri
Application Number:
JP50239298A
Publication Date:
May 28, 2008
Filing Date:
June 18, 1997
Export Citation:
Assignee:
NOKIA CORPORATION
International Classes:
H04B3/20; H04B3/23; H04R3/02; H04M1/60; H04M9/08
Domestic Patent References:
| JP837480A | ||||
| JP7250010A | ||||
| JP6510889A | ||||
| JP6333045A |
Attorney, Agent or Firm:
Minoru Nakamura
Fumiaki Otsuka
Shishido Kaichi
Hideto Takeuchi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo
Fumiaki Otsuka
Shishido Kaichi
Hideto Takeuchi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo