EP1941492A1 - Method for the estimation of a useful signal with the aid of an adaptive process - Google Patents
Method for the estimation of a useful signal with the aid of an adaptive processInfo
- Publication number
- EP1941492A1 EP1941492A1 EP06819144A EP06819144A EP1941492A1 EP 1941492 A1 EP1941492 A1 EP 1941492A1 EP 06819144 A EP06819144 A EP 06819144A EP 06819144 A EP06819144 A EP 06819144A EP 1941492 A1 EP1941492 A1 EP 1941492A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- estimated
- unit
- useful
- adaptive process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17857—Geometric disposition, e.g. placement of microphones
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
- G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
Definitions
- the present invention relates to a method for
- Noise sources are increasingly perceived as an environmental impact and are considered to reduce the quality of life.
- noise reduction methods based on the principle of wave cancellation have already been proposed.
- ANC Active Noise Canceling
- Transducers such as speakers produced.
- the signal radiated by the electro-acoustic transducers is calculated by means of a suitable algorithm and continuously corrected.
- Signals are the information supplied by one or more sensors. These are on the one hand information about the nature of the signal to be minimized. For this purpose, for example, a microphone can be used which detects the noise to be minimized. On the other hand, information about the remaining residual signal is needed. Again, microphones can be used.
- An algorithm for active noise reduction requires information from at least one sensor (for example a microphone), which determines the residual error - also referred to below as an error signal.
- another sensor is provided that provides information about the nature of the signal to be minimized.
- an adaptive noise reduction system requires one or more actuators (for example in the form of loudspeakers) to output the correction signal.
- the information from the sensors must be converted by an analog / digital converter into a suitable format. After being processed by the algorithm, the signal from a Digital / analog converter converted back and transmitted to the actuators.
- an additional sensor unit would therefore detect a signal e + g, which is composed of the speech signal g and the residual signal e. Since the residual signal e is always present, it is thus always detected together with the speech signal g (useful signal).
- the present invention is therefore based on the object to provide a method for estimating useful signals, in which no additional sensor unit is necessary.
- Noise reduction system indicated wherein the useful signal is at least partially superimposed by an out-of-space emitted interference signal.
- the method consists in - that the interference signal is detected by means of at least one sensor unit,
- a sum signal is detected in space by means of at least one further sensor unit, wherein the sum signal comprises the useful signal and a residual signal, and
- That a transmission distance of the space is estimated by means of an adaptive process in which the sum signal and the noise signal are processed.
- the method is further characterized in that - an estimated residual signal is determined in a further adaptive process in which the interference signal is processed, and
- An embodiment of the present invention is that the estimated useful signal is supplied to the further adaptive process. Another embodiment of the present invention is
- the estimated residual signal is generated by subtracting the estimated output signal from an output signal generated by the further adaptive process.
- Yet another embodiment of the present invention is that the interference signal is detected with at least one sensor unit arranged outside the space.
- the device comprises: at least one sensor unit for detecting the interference signal
- At least one further sensor unit for detecting a sum signal in space, wherein the sum signal comprises the useful signal and a residual signal
- an adaptive process unit for determining a transfer function of a filter unit by minimizing the sum signal and using the interfering signal, the transfer function being an estimate of the transmission distance of the space.
- a subtraction unit which is operatively connected to an output of the further filter unit and the sum signal is applied, wherein the first-mentioned signal is subtracted from the second-mentioned signal to obtain an estimated useful signal.
- An embodiment of the present invention is that the estimated useful signal of the further adaptive processing unit is applied.
- a still further embodiment of the present invention is that the at least one sensor unit for detecting the interference signal is arranged outside the room.
- the adaptive processor unit processes signals that are not acoustic in nature and also the useful signal is not acoustic in nature.
- Embodiment variants are shown, further explained. Showing:
- Fig. 1 is a block diagram of a known active noise reduction system in a schematic
- Fig. 2 is a block diagram of a first embodiment of the invention, again in schematic representation
- Fig. 3 is a block diagram of a second embodiment of the invention, also in a schematic representation.
- FIG. 1 A known active noise reduction system is shown in FIG. 1
- a signal x to be minimized which is detected outside a room, for example with the aid of a sensor unit (for example a microphone), becomes a transmission path characterized by a transfer function H.
- Transfer function H changed in space is included.
- an actuator unit (not shown in FIG. 1), an estimated output signal y generated in a filter unit 6 is fed into the room, leaving a residual signal e which is fed to an adaptive process unit 7.
- the filter unit 6 is adjusted in such a way that the residual signal e is further minimized, in the best case completely eliminated, via the estimated output signal y.
- the mentioned signal combinations are shown in FIG. 1 with an addition unit 3, in which the estimated output signal y is subtracted from the residual signal e.
- a useful signal g is further added. It is, for example, a voice signal of a person who is located in the room. The useful signal g is usually important and should therefore not be eliminated by the noise reduction system.
- Fig. 2 shows a first embodiment of the invention with reference to a block diagram. So that the useful signal g is not eliminated as in the known method, according to the invention a further adaptive process unit 11 and a further filter unit 10 are provided. With the further units 10 and 11, an estimated residual signal e is generated which corresponds as far as possible to the residual signal e. In accordance with the invention, this opens up the possibility of obtaining the useful signal g.
- the adaptive process unit 11 is one by another
- Addition unit 12 generated input signal, namely the useful signal g, and the signal x to be minimized supplied. From this, the further filter unit 10 or its transfer function is adjusted by means of an adaptive process, which is carried out in the adaptive process unit 11, in such a way that the estimated residual signal e is obtained using the signal x to be minimized.
- the useful signal g which in this case may be, for example, speech
- interpreters are usually housed in cabins.
- the voice signal to be translated is typically detected outside the cabin with a microphone and transmitted to the corresponding cabin, this transmission can be wired or via radio.
- the microphone which captures the speech signal to be translated, typically not only records the desired speech signal but also the ambient sounds. Under certain circumstances, this ambient noise may be so loud that the insulation of the cabin is not sufficient to hide these noises. In the case of known systems (for example also in the case of a system according to FIG. 1), this entails above all two disadvantageous effects:
- the microphone used by the adaptive process unit to detect the residual signal e can also be used to detect the speech signal (useful signal g).
- Fig. 3 shows another embodiment of the present invention. As in the case of that according to FIG. 2, a further one is also in the embodiment according to FIG. 3
- Filter unit 10 and another adaptive processing unit 11 is provided.
- the useful signal g is supplied to the further adaptive process unit 11 but the summation signal e + g detected in the room.
- the estimated residual signal e does not directly follow, but a subtraction unit 17 is connected downstream of the further filter unit 10 in which the estimated output signal y is subtracted from the output signal of the further filter unit 10 in order to obtain the estimated residual signal e.
- the estimated residual signal e thus obtained is used subsequently to generate the useful signal g in the addition unit 12.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH17102005 | 2005-10-25 | ||
PCT/EP2006/067770 WO2007048810A1 (en) | 2005-10-25 | 2006-10-25 | Method for the estimation of a useful signal with the aid of an adaptive process |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1941492A1 true EP1941492A1 (en) | 2008-07-09 |
Family
ID=37806784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06819144A Withdrawn EP1941492A1 (en) | 2005-10-25 | 2006-10-25 | Method for the estimation of a useful signal with the aid of an adaptive process |
Country Status (3)
Country | Link |
---|---|
US (1) | US20080285767A1 (en) |
EP (1) | EP1941492A1 (en) |
WO (1) | WO2007048810A1 (en) |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4628529A (en) * | 1985-07-01 | 1986-12-09 | Motorola, Inc. | Noise suppression system |
US5117401A (en) * | 1990-08-16 | 1992-05-26 | Hughes Aircraft Company | Active adaptive noise canceller without training mode |
US5406622A (en) * | 1993-09-02 | 1995-04-11 | At&T Corp. | Outbound noise cancellation for telephonic handset |
FR2726392B1 (en) * | 1994-10-28 | 1997-01-10 | Alcatel Mobile Comm France | METHOD AND APPARATUS FOR SUPPRESSING NOISE IN A SPEAKING SIGNAL, AND SYSTEM WITH CORRESPONDING ECHO CANCELLATION |
US5978489A (en) * | 1997-05-05 | 1999-11-02 | Oregon Graduate Institute Of Science And Technology | Multi-actuator system for active sound and vibration cancellation |
US7853024B2 (en) * | 1997-08-14 | 2010-12-14 | Silentium Ltd. | Active noise control system and method |
US6549586B2 (en) * | 1999-04-12 | 2003-04-15 | Telefonaktiebolaget L M Ericsson | System and method for dual microphone signal noise reduction using spectral subtraction |
US6717991B1 (en) * | 1998-05-27 | 2004-04-06 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method for dual microphone signal noise reduction using spectral subtraction |
DE19842804A1 (en) * | 1998-09-18 | 2000-03-23 | Deutsche Telekom Ag | Method and device for active noise reduction in open telephone booths |
US7450725B2 (en) * | 2001-12-17 | 2008-11-11 | Mahle International Gmbh | Digital filter modeling for active noise cancellation |
US6917688B2 (en) * | 2002-09-11 | 2005-07-12 | Nanyang Technological University | Adaptive noise cancelling microphone system |
US7774396B2 (en) * | 2005-11-18 | 2010-08-10 | Dynamic Hearing Pty Ltd | Method and device for low delay processing |
US8494174B2 (en) * | 2007-07-19 | 2013-07-23 | Alon Konchitsky | Adaptive filters to improve voice signals in communication systems |
US8553898B2 (en) * | 2009-11-30 | 2013-10-08 | Emmet Raftery | Method and system for reducing acoustical reverberations in an at least partially enclosed space |
-
2006
- 2006-10-25 WO PCT/EP2006/067770 patent/WO2007048810A1/en active Application Filing
- 2006-10-25 US US12/091,547 patent/US20080285767A1/en not_active Abandoned
- 2006-10-25 EP EP06819144A patent/EP1941492A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
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See references of WO2007048810A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20080285767A1 (en) | 2008-11-20 |
WO2007048810A1 (en) | 2007-05-03 |
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