US5559834A
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Method of reducing crosstalk in processing of acoustic or optical signals
Assignee: FRANHOFER-GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV PATENTABTEILUNG
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Filing: 1992-10-06
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Granted: 1996-09-24
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Expires: 2012-10-06
Abstract
Abstract PCT No. PCT/DE92/00855 Sec. 371 Date Apr. 15, 1994 Sec. 102(e) Date Apr. 15, 1994 PCT Filed Oct. 6, 1992 PCT Pub. No. WO93/08482 PCT Pub. Date Apr. 29, 1993A method for reducing frequency crosstalk in the transmission of digitized audio signals. Signals from partial bands in which spectral components of specific frequencies occur as signal components and signals from partial bands in which spectral components occur as crosstalk components in the stop range, undergo a weighted summation. Following transmission, the partial band signals undergo an inverse operation to weighted summation. The method operates independently of the selected encoding process, and is consequently universally usable.
Inventors
- 👤 Bernd Edler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:49
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/66; H04B1/667
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
127 words
Method for reducing frequency crosstalk in processing of digitized input signals, in which input signals are subdivided into partial frequency bands by means of series connected transformation stages, for subsequent encoding, transmission or storage, followed by decoding, the signals from the partial bands being again combined to form a signal, said method comprising the steps of: prior to said encoding, for each partial band performing a weighted summation of a partial band signal thereof, which signal contains spectral components of specific frequencies as signal components, and other partial band signals from partial bands in which said spectral components of said specific frequencies occur as crosstalk components in a stop range; processing the partial band signals by means of an inverse operation to the weighted summation, following decoding.
Claim 2
Dependent Claim
127 words
Method for reducing frequency crosstalk in processing of digitized input signals, in which input signals are subdivided into partial frequency bands by means of series connected transformation stages, for subsequent encoding, transmission or storage, followed by decoding, the signals from the partial bands being again combined to form a signal, said method comprising the steps of: prior to said encoding, for each partial band performing a weighted summation of a partial band signal thereof, which signal contains spectral components of specific frequencies as signal components, and other partial band signals from partial bands in which said spectral components of said specific frequencies occur as crosstalk components in a stop range; processing the partial band signals by means of an inverse operation to the weighted summation, following decoding.
Claim 3
Dependent Claim
59 words
Method according to claim 1, wherein a first transformation stage of said series connected transformation stages subdivides the input signal into an even number M of partial bands 0 to M-1; and means are provided for causing an output signal of uneven numbered partial bands of said stage to undergo a correction operation before entering a second transformation stage.
Claim 4
Dependent Claim
39 words
Method according to claim 2, wherein said correction operation comprises multiplying every second time consecutive value of output signals of said uneven numbered partial bands by -1, while the output signals of the even numbered partial bands remain unchanged.
Claim 5
Dependent Claim
59 words
Method according to claim 3, wherein weighted signals y i in the partial band i are obtained in accordance with the following: ##EQU5## in which x i is a partial band signal of partial band i, and c m and d m represent weight factors, d m being determined from the weight factors c m by the above equation.
Claim 6
Dependent Claim
59 words
Method according to claim 2, wherein weighted signals y i in the partial band i are obtained in accordance with the following: ##EQU6## in which x i is a partial band signal of partial band i, and c m and d m represent weight factors, d m being determined from the weight factors c m by the above equation.
Claim 7
Dependent Claim
100 words
Method according to claim 1, wherein weighted signals y i i in the partial band i are obtained in accordance with the following: ##EQU7## in which x i is a partial band signal of partial band i, c m and d m represent weight factors, d m being determined from the weight factors c m by the above equation, N is the number of partial bands in said second transformation stage, k is a partial band index for partial bands of the first transformation stage and m is a partial band index for partial bands of the second transformation stage.
Claim 8
Dependent Claim
62 words
Method according to claim 6, wherein said inverse operation is performed according to the following equation: x.sub.i '=d.sub.m ·(y.sub.i '-c.sub.m ·y.sub.j ') x.sub.j '=d.sub.m ·(y.sub.j '-c.sub.m ·y.sub.i ') in which x i ' is the partial band signal of partial band i after performing inverse operation y i ', the weighted partial band signal of partial band i, following encoding and decoding.
Claim 9
Dependent Claim
25 words
Method according to claim 6, wherein the weight factors c m for summation are optimized with respect to the frequency response of the series-connected stages.
Claim 10
Dependent Claim
33 words
Method according to claim 8, wherein the number of weight factors c m to be used for summation is half as large as a number of partial bands produced by a following stage.
Claim 11
Dependent Claim
33 words
Method according to claim 6, wherein the number of weight factors c m to be used for summation is half as large as a number of partial bands produced by a following stage.
Claim 12
Dependent Claim
65 words
Method according to claim 1, wherein said inverse operation is performed according to the following equation: x.sub.i '=d.sub.m ·(y.sub.i '-c.sub.m ·y.sub.j ') x.sub.j '=d.sub.m ·(y.sub.j '-c.sub.m ·y.sub.i ') in which x i ' is the partial band signal of partial band i after performing the inverse operation, and y i ' is the weighted partial band signal of partial band i, following encoding and decoding.
Claim 13
Dependent Claim
33 words
Method according to claim 11, wherein the number of weight factors c m to be used for summation is half as large as a number of partial bands produced by a following stage.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1999-09-24 | 2000-03-25 | 2000-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-24 | 2004-03-25 | 2004-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-24 | 2008-03-25 | 2008-09-24 | $7700.00 | Window Closed / Lapsed |