US5500903A
Expired / Lapsed
US
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Method for vectorial noise-reduction in speech, and implementation device
Assignee: Thales Avionics SAS
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Filing: 1993-12-28
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Granted: 1996-03-19
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Expires: 2013-12-28
Abstract
Abstract A sound pick-up operation is carried out by means of at least four microphones positioned in a plane before the speaker, linear combinations are formed by additions and subtractions of the signals from these microphones and certain of these combinations are used as noise-only sources to process them by an adaptive vector filter to produce an estimation of the noise that is subtracted from the noisy signal.
Inventors
- 👤 Christian Gulli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:54
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/80; G01S3/86; G01S3/802; G01S3/805; H; H04; H04R; H04R3/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
A method for vectorial noise-reduction for a source of sound signals that is substantially a point source, comprising the steps of: vectorially picking up sound signals by means of at least four equally spaced out microphones positioned in a plane before the source of sound signals forming linear combinations from the sound signals by additions and subtractions of the sound signals from said microphones; wherein the sum of all the sound signals from the microphones represents the noisy signal each of the other linear combinations of sound signals comprises as many subtractions as additions of the sound signals and represent noise only signals; processing the linear combinations of the sound signals from the microphones that have as many subtractions as additions with a vectorial adaptive filter to produce an estimate of the noise of the noisy signal; and subtracting said estimate of the noise of the noisy signal from the noisy signal.
Claim 2
Independent Claim
152 words
A method for vectorial noise-reduction for a source of sound signals that is substantially a point source, comprising the steps of: vectorially picking up sound signals by means of at least four equally spaced out microphones positioned in a plane before the source of sound signals forming linear combinations from the sound signals by additions and subtractions of the sound signals from said microphones; wherein the sum of all the sound signals from the microphones represents the noisy signal each of the other linear combinations of sound signals comprises as many subtractions as additions of the sound signals and represent noise only signals; processing the linear combinations of the sound signals from the microphones that have as many subtractions as additions with a vectorial adaptive filter to produce an estimate of the noise of the noisy signal; and subtracting said estimate of the noise of the noisy signal from the noisy signal.
Claim 3
Dependent Claim
17 words
A method according claim 1, wherein the vectorial noise-reduction implements an LMS or RLS type of algorithm.
Claim 4
Dependent Claim
36 words
A method according to claim 1, wherein the microphones are arranged in two orthogonal and coplanar sets, the normal to the plane thus formed being pointed towards the source of the sound signals to be processed.
Claim 5
Dependent Claim
86 words
A method according to claim 3 wherein, each set of microphones forms first and second physical antennas having the same directional major lobe with two frequencies separated by an octave and further comprising the step of adding the signals from the first and second physical antennas to form a servocontrol signal and using the servocontrol signal to servocontrol the the physical antenna's orientation in terms of elevation angle and bearing and plane in which the microphones are positioned in relation to the source of sound signals.
Claim 6
Dependent Claim
16 words
A method according to claim 1, wherein the signals of all the microphones are sampled synchronously.
Claim 7
Independent Claim
45 words
A method according to any of the claims 4 or 5, wherein the orientation, in terms of elevation angle and relative bearing, of the plane in which the microphones are positioned in relation to the source of sound signals is determined by a super-resolving method.
Claim 8
Dependent Claim
21 words
A method according to claim 6, wherein the super-resolving method is chosen from among the CAPON, LAGUNAS, AR or MUSIC methods.
Claim 9
Independent Claim
116 words
A method for vectorial noise-reduction in a source that is substantially a point source, comprising at least one set of at least eight equally spaced out microphones, each followed by an amplifier, a sampling device, the sampling devices being all synchronous and connected to a binary conversion matrix comprising serializing connections and inverters, a first one of these outputs corresponding to the serializing of all the inputs, each of these other outputs corresponding to a different combination of of serializing operations and input inversions, the first output of this combiner device being connected to the (+) input of a subtractor and the others being connected via an adaptive filter to the (-) input of the subtractor.
Claim 10
Independent Claim
116 words
A method for vectorial noise-reduction in a source that is substantially a point source, comprising at least one set of at least eight equally spaced out microphones, each followed by an amplifier, a sampling device, the sampling devices being all synchronous and connected to a binary conversion matrix comprising serializing connections and inverters, a first one of these outputs corresponding to the serializing of all the inputs, each of these other outputs corresponding to a different combination of of serializing operations and input inversions, the first output of this combiner device being connected to the (+) input of a subtractor and the others being connected via an adaptive filter to the (-) input of the subtractor.
Claim 11
Dependent Claim
97 words
A device according to claim 8, comprising two orthogonal and coplanar sets of microphones, the outputs of the sampling devices being each connected, via a filter, for each of the two sets, as far a first part of these outputs is concerned, to first summator and, as far as a second part of these outputs is concerned, to a second summatot, each of the two summators being connected via a compensating filter to another summator, the output of which is connected to a device for the positional servocontrol of the plane in which the microphones are positioned.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-19 | 1999-09-18 | 2000-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-19 | 2003-09-18 | 2004-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-19 | 2007-09-18 | 2008-03-19 | $7700.00 | Window Closed / Lapsed |