Telephonic communications – Transmission line conditioning
Patent
1994-06-09
1996-11-19
Hofsass, Jeffery
Telephonic communications
Transmission line conditioning
379386, 379237, 379400, 379351, H04R 2900
Patent
active
055771173
ABSTRACT:
In methods and apparatus for estimating the frequency response of telecommunications channels, signals carried on the channels are divided into pluralities of signal segments of limited duration, unvoiced signal segments are identified, and spectral components of the unvoiced signal segments are measured. The measured spectral components may be integrated over time to derive time-averaged measurements of the spectral components. The time-averaged measurements may be compared to corresponding components of expected unvoiced signal spectra to improve the accuracy of the frequency response estimates. Filters may be inserted in the channels to adjust the frequency responses, the filters having filter characteristics selected in response to the measured spectral components. The methods and apparatus can be used to compensate for poor bass frequency response in voice channels.
REFERENCES:
patent: 3649765 (1972-03-01), Rabiner et al.
patent: 3808370 (1974-04-01), Jackson et al.
patent: 4061878 (1977-12-01), Adoul et al.
patent: 4091237 (1978-05-01), Wolnowsky et al.
patent: 4797931 (1989-01-01), Furukawa et al.
patent: 4847885 (1989-07-01), Vittorelli
patent: 4852169 (1989-07-01), Veeneman et al.
patent: 5195132 (1993-03-01), Bowker et al.
patent: 5197113 (1993-03-01), Mumolo
patent: 5216747 (1993-06-01), Hardwick et al.
patent: 5280525 (1994-01-01), Wesel
A Pattern Recognition Approach To Voiced-Unvoiced-Silence Classification With Applications To Speech Recognition.
Bishnu S. Atal, IEEE and Lawrence R.Rabiner IEEE Jun. 3, 1976.
Atal et al., "A Pattern Recognition Approach to Voiced-Unvoiced-Silence Classification With Applications to Speech Recognition", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-24, No. 3, pp. 201-212, (1976).
Iyengar Vasu
Rabipour Rafi
Hofsass Jeffery
Northern Telecom Limited
Saint-Surin Jacques M.
LandOfFree
Methods and apparatus for estimating and adjusting the frequency does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods and apparatus for estimating and adjusting the frequency, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and apparatus for estimating and adjusting the frequency will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-547192