Telephonic communications – Echo cancellation or suppression – Residual echo cancellation
Reexamination Certificate
2006-08-15
2006-08-15
Tran, Sinh (Department: 2646)
Telephonic communications
Echo cancellation or suppression
Residual echo cancellation
C370S289000
Reexamination Certificate
active
07092516
ABSTRACT:
An echo processor includes an echo suppression amount decider which compares a state of an outgoing input signal to be sent including an echo with a state of an incoming input signal and calculates an echo suppression amount based on the comparison, a time-frequency transformer which transforms the outgoing input signal in the time domain into the frequency domain, thereby generating an amplitude spectrum and a phase spectrum, a noise-spectrum estimator which estimates a noise spectrum from the amplitude spectrum, a mixer which mixes an amount of the noise spectrum based on the echo suppression amount with the amplitude spectrum, and a frequency-time transformer which generates an outgoing output signal including a noise in the time domain on the basis of the amplitude spectrum, with which an amount of the noise spectrum is mixed by the mixer, and the phase spectrum, and outputs the outgoing output signal.
REFERENCES:
patent: 5561668 (1996-10-01), Genter
patent: 5920834 (1999-07-01), Sih et al.
patent: 6163608 (2000-12-01), Romesburg et al.
patent: 6658107 (2003-12-01), Sorqvist et al.
patent: 197 29 521 (1999-01-01), None
patent: 1 041 539 (2000-10-01), None
patent: 1 059 628 (2000-12-01), None
patent: 2000-224081 (2000-08-01), None
patent: 2000-347688 (2000-12-01), None
patent: WO 00/25441 (2000-05-01), None
patent: WO 00/74362 (2000-12-01), None
patent: WO 01/10102 (2001-02-01), None
patent: WO 01/33814 (2001-05-01), None
“Echo Cancellers”, Proceedings of International Telecommunication Union, ITU-T Recommendation G. 165, Mar. 1993, pp. 1-27.
“Acoustic Echo Controllers”, Proceedings of International Telecommunication Union, ITU-T Recommendation G.167, Mar. 1993, pp. 1-16.
Furuta Satoru
Takahashi Shinya
Briney III Walter F
Mitsubishi Denki & Kabushiki Kaisha
Tran Sinh
LandOfFree
Echo processor generating pseudo background noise with high... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Echo processor generating pseudo background noise with high..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Echo processor generating pseudo background noise with high... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3681650