EP1016314A1 - Process and electric appliance for optimising acoustic signal reception - Google Patents
Process and electric appliance for optimising acoustic signal receptionInfo
- Publication number
- EP1016314A1 EP1016314A1 EP98916975A EP98916975A EP1016314A1 EP 1016314 A1 EP1016314 A1 EP 1016314A1 EP 98916975 A EP98916975 A EP 98916975A EP 98916975 A EP98916975 A EP 98916975A EP 1016314 A1 EP1016314 A1 EP 1016314A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signals
- electrical
- microphones
- location
- speech
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
Definitions
- the invention is based on a method according to the category of independent claim 1 and on an electrical device according to the category of independent claim 5.
- Microphone output signals a characteristic directivity is achieved.
- the sensitivity can be increased at a predetermined point in the room, so that a sound source arranged there can be picked up particularly well by the microphones and a masking of Interference signal sources at other points in the room is made possible.
- Voice processing system in a voice-controlled electrical device, so that interference is not included from the outset and accordingly does not have to be suppressed by complex measures.
- the word recognition probability of a voice-controlled electrical device so that interference is not included from the outset and accordingly does not have to be suppressed by complex measures.
- Speech recognition system is increased accordingly and word analysis simplified.
- the signal is less distorted by background noise.
- phase delays of the at least one phase delay element can be set. In this way, a location-independent setting of a reception maximum for the heterodyne signal is possible.
- a signal processing unit is provided, to which the electrical signals of the microphones are fed and which determines coordinates of at least one sound source as a function of the amplitudes of the electrical signals.
- phase delay of the at least one phase delay element is set so that a reception maximum for the beat signal results for a desired sound source.
- Signal processing unit is assigned to a speech analysis device and that the speech analysis device carries out a comparison of parameters of the electrical signals with speech parameters stored in an assigned storage unit and with a function of the comparison result
- Probability value identifies a sound source as a speech source.
- the phase delay of the at least one phase delay element can be set such that a reception maximum results for the local signal at the location of the speech source.
- the phase delay of the at least one phase delay element is set automatically without user intervention, the location of the greatest sensitivity being additionally adaptive to the location of the
- FIG. 1 shows a block diagram of a voice-input-capable electrical device with two microphones whose electrical output signals are superimposed without phase shift
- FIG. 2 shows a block diagram of an electrical device with at least three microphones whose electrical output signals can be phase-shifted.
- l denotes a voice-input-capable electrical device designed as a telecommunications terminal.
- the telecommunication terminal 1 comprises an adder 20 and a speech processing unit 70.
- An output 97 of the adder 20 is connected to an input 107 of the speech processing unit 70.
- An output 108 of the speech processing unit 70 is connected to a telecommunications network, not shown in FIG. 1.
- a first microphone 5 and a second microphone 10 are connected to the telecommunications terminal 1.
- An output 104 of the first microphone 5 is connected to a first non-inverting input 87 of the adder 20 and an output 105 of the second microphone 10 is connected to a second non-inverting input 90 of the adder 20.
- a sound source 55 designed as a loudspeaker is arranged, which emits voice signals.
- the voice signals are received by the two microphones 5, 10 according to the dashed arrows drawn in FIG. 1.
- the sound source 55 designed as a speech source can be, for example, the speech organ of a user of the telecommunication terminal 1.
- the microphones 5, 10 convert the received speech signals into electrical signals around and forward them to the adder 20, where they are superimposed by simple addition. Since the speech source 55 is equally spaced from the two microphones 5, 10, the speech signal emitted by it is superimposed on the electrical output signals
- Microphones 5, 10 scored twice in adder 20 The speech source 55 is thus located at a location for which the beat signal at the output 97 of the adder 20 results in a sensitivity or reception maximum.
- the locations of the reception maxima are repeated with the distance of the wavelength of the signal. Since speech represents a statistically distributed frequency mixture, on average only one reception maximum is set in the geometric center between the two microphones 5, 10 according to a dashed line 200 in FIG. 1.
- FIG. 2 shows an electrical device 1 which is capable of being inputted as a telecommunications terminal and is designed according to the invention. It comprises a first phase delay element 30, a second phase delay element 35, a third phase delay element 40 and a fourth
- the telecommunications terminal 1 furthermore has a signal processing unit 50, a speech analysis device 60 and a storage unit 65. Furthermore, a first adder 20 and a second adder 25 and a speech processing unit 70 are provided in the telecommunications terminal 1.
- a first microphone 5, a second microphone 10 and a third microphone 15 are connected to the telecommunications terminal 1.
- An output 104 of the first microphone 5 is connected to a first input 85 of the first phase delay element 30 and to a first input 75 of the signal processing unit 50.
- An output 86 of the first phase delay element 30 is connected to a first non-inverting input 87 of the first Addition member 20 connected.
- An output 105 of the second microphone 10 is connected to a first input 88 of the second phase delay element 35 and to a second input 76 of the signal processing unit 50.
- An output 89 of the second phase delay element 35 is connected to a second non-inverting input 90 of the first adder element 20.
- An output 106 of the third microphone 15 is connected to a first input 94 of the fourth phase delay element 45 and to a third input 77 of the signal processing unit 50.
- An output 95 of the fourth phase delay element 45 is connected to a first non-inverting input 96 of the second adder element 25.
- Another microphone can be connected to a first input 91 of the third via its connecting line via a connecting line shown in broken lines in FIG
- Phase delay element 40 and connected to a fourth input 78 of the signal processing unit 50.
- An output 92 of the fourth phase delay element 40 is connected to a second non-inverting input 93 of the second adder element 25.
- An output 97 of the first adder 20 is connected to a third non-inverting input 98 of the second adder 25.
- An output 99 of the second adder 25 is connected to an input 107 of the speech processing unit 70.
- An output 108 of the speech processing unit 70 is connected to a telecommunications network, not shown in FIG. 2.
- the voice processing unit 70 according to FIGS. 1 and 2 has the task of preparing the superimposed electrical voice signals for transmission in the telecommunications network and of delivering them to the latter.
- further microphones can be connected to the telecommunications terminal 1 and superimposed with the other electrical voice signals via corresponding phase delay and addition elements and fed to the voice processing unit 70 become.
- the output signals of these further microphones are also to be fed to the signal processing unit 50.
- Figure 2 which is provided for the connection of a maximum of four microphones, the
- Signal processing unit 50 has a fifth input 79, which is connected to an output 110 of memory unit 65.
- a speech analysis device 60 for mutual data exchange is also connected to the signal processing unit 50.
- a first output 81 is the
- Signal processing unit 50 connected to a second input 100 of the first phase delay element 30.
- a second output 82 of the signal processing unit 50 is connected to a second input 101 of the second phase delay element 35.
- a third output 83 of the signal processing unit 50 is connected to a second input 102 of the third phase delay element 40.
- a fourth output 84 of the signal processing unit 50 is connected to a second input 103 of the fourth phase delay element 45.
- a sound source 55 designed as a loudspeaker is again shown in FIG. 2, which emits speech signals and can represent, for example, the speech organ of a user. According to the dashed arrows in FIG. 2, the three microphones 5, 10, 15 receive the speech signals of the sound source 55 designed as a speech source. According to FIG.
- the speech source 55 is located at a geometrical location represented by a dashed line 200 which, in contrast to the arrangement, 1 no longer forms the geometric center between the three microphones 5, 10, 15, so that the three microphones 5, 10, 15 are at different distances from the speech source 55.
- the location for which the superimposed signal of the electrical voice signals results in a reception maximum can be determined by suitable choice of the phase delay of the individual phase delay elements 30, 35, 40, 45 can be specified.
- a reception maximum can also be achieved for the non-central arrangement of the speech source 55 according to FIG.
- it may already be sufficient to delay only a single microphone output signal in the phase so that limited to this application case, only one phase delay element would be required.
- it may already be sufficient to delay only a single microphone output signal in the phase so that limited to this application case, only one phase delay element would be required.
- Speech processing unit 70 results in a maximum reception. Since the attachment locations of the microphones 5, 10, 15 are also important for the setting of a reception maximum, a reception maximum for the heterodyne signal can be provided at a predefined location for the speech source 55 both by a suitable arrangement of the microphones 5, 10, 15 and by a suitable choice the phase delays of the phase delay elements 30, 35, 40, 45 can be set. However, if the mounting locations of the microphones 5, 10, 15 cannot be changed, the maximum reception for the beat signal can only be achieved by varying the phase delays of the phase delay elements 30, 35, 40, 45.
- the reception sensitivity of the telecommunications terminal 1 for certain areas can be strengthened or reduced by suitable selection of the attachment locations for the microphones 5, 10, 15 and the phase delays of the phase delay elements 30, 35, 45 connected to the microphones 5, 10, 15, so that disturbing ones Sound sources in areas of low sensitivity can essentially be hidden and useful sound sources in the area of increased sensitivity can be received better.
- the reception sensitivity can be determined in a predetermined range.
- the signal processing unit 50 can optionally calculate a three-dimensional image of the sound environment, so that all sound sources can be determined locally. If only two microphones are used, only a two-dimensional image of the sound environment can be determined. When using more than three microphones, the
- the speech analysis device 60 it is possible to compare parameters of the electrical microphone output signals with speech parameters stored in the storage unit 65.
- the signal processing unit 50 determines a value depending on the comparison result for each sound source detected in the sound environment, which indicates the probability with which the respective sound source was recognized as the speech source.
- the sound source with the highest probability value is then identified as the speech source.
- the phase delays of the phase delay elements 30, 35, 45 connected to the microphones 5, 10, 15 can be set in such a way that a reception maximum results for the local signal at the location of the sound source identified as the speech source.
- the other sound sources are thus essentially masked out as sources of interference.
- the corresponding setting of the phase delays can also be carried out automatically by the signal processing unit 50, so that it is also possible to adapt the phase shifts of the phase delay elements 30, 35, 45 connected to the microphones 5, 10, 15 to a changing location of the sound source identified as the speech source, so that despite a relative movement between the Speech source 55 and the telecommunications terminal 1 or the microphones 5, 10, 15 at the location of the speech source 55 for the overlay signal a reception maximum is maintained.
- the user can also specify a sound source as the speech source. This is advantageous, for example, if the telecommunication terminal 1 is integrated in a car radio and both the driver and a passenger are considered as the voice source. It can then be selected by appropriate changes in the phase delays of the phase delay elements 30, 35, 45 connected to the microphones 5, 10, 15 of the driver or a passenger as the speech source 55, so that a reception maximum for the local signal is set for the location of the selected speech source .
- the microphones 5, 10, 15 are part of a hands-free device of the telecommunication terminal 1, then voice signals from a voice source 55 can be recorded locally in a targeted manner and almost undisturbed. The speech intelligibility of the speech signals recorded by the hands-free device is thereby considerably improved.
- the invention is not limited to a telecommunications terminal 1, but can be used for all voice-input-capable electrical devices. These can also be devices that have voice control, for example.
- the voice processing unit 70 is used to evaluate and initiate voice commands. Since interference-free reception is particularly important when evaluating voice commands, the inventive separation of useful and interference signals enables the error-free detection of the voice commands without special mechanical aids such as directional microphones or special filter algorithms for eliminating the interference signals are required.
- the voice-input-capable electrical device 1 When the voice-input-capable electrical device 1 is designed as a "telecommunications terminal, it is not necessary, because of the adaptive tracking of the reception maximum for the beat signal, in the case of a relative movement between the telecommunications terminal 1 and the speech source 55, that the telecommunications terminal 1 is arranged in a fixed position. Therefore, the invention is also applicable to radio devices The same applies to mobile voice-input-capable electrical devices with voice control.
- Voice-input-compatible electrical devices with voice control can be, for example, car radios, personal computers and the like, but also wired or wireless telecommunication terminals.
- signal processing unit 50 To implement signal processing unit 50 or a separate signal processing unit.
- a digital signal processor can be used as the signal processing unit.
- the method according to the invention and the electrical device according to the invention can be used very generally to optimize the reception of any acoustic signals, so that no restriction to electrical devices capable of inputting voice is necessary. A speech analysis is then not necessary either. In order to select a sound source as the useful sound source, suitable criteria must then be selected, which are to be taken into account accordingly by the signal processing unit 50. Provision can also be made for a user on an input unit
- the Sound sources not selected as useful sound sources are then masked out by means of suitable phase delays.
- the phase delays are set by the signal processing unit 50 in such a way that the reception sensitivity is adaptively tracked as a function of the location of the useful sound source, the noise sources being adaptively masked out as a function of their location.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19741596 | 1997-09-20 | ||
DE19741596A DE19741596A1 (en) | 1997-09-20 | 1997-09-20 | Optimum directional reception of acoustic signals for speech recognition |
PCT/EP1998/001537 WO1999016285A1 (en) | 1997-09-20 | 1998-03-17 | Process and electric appliance for optimising acoustic signal reception |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1016314A1 true EP1016314A1 (en) | 2000-07-05 |
EP1016314B1 EP1016314B1 (en) | 2002-06-19 |
Family
ID=7843098
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98916975A Expired - Lifetime EP1016314B1 (en) | 1997-09-20 | 1998-03-17 | Process and electric appliance for optimising acoustic signal reception |
Country Status (5)
Country | Link |
---|---|
US (1) | US6529869B1 (en) |
EP (1) | EP1016314B1 (en) |
JP (1) | JP2001517916A (en) |
DE (2) | DE19741596A1 (en) |
WO (1) | WO1999016285A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19854373B4 (en) | 1998-11-25 | 2005-02-24 | Robert Bosch Gmbh | Method for controlling the sensitivity of a microphone |
DE19943872A1 (en) * | 1999-09-14 | 2001-03-15 | Thomson Brandt Gmbh | Device for adjusting the directional characteristic of microphones for voice control |
DE19943875A1 (en) * | 1999-09-14 | 2001-03-15 | Thomson Brandt Gmbh | Voice control system with a microphone array |
SI3147910T1 (en) | 2009-05-27 | 2019-11-29 | Rolls Royce Nuclear Field Services Inc | A vehicular inspection system for inspecting a secondary side of a steam generator |
DE112014003443B4 (en) * | 2013-07-26 | 2016-12-29 | Analog Devices, Inc. | microphone calibration |
US9685730B2 (en) | 2014-09-12 | 2017-06-20 | Steelcase Inc. | Floor power distribution system |
US9584910B2 (en) | 2014-12-17 | 2017-02-28 | Steelcase Inc. | Sound gathering system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4279027A (en) | 1979-09-13 | 1981-07-14 | Honeywell Inc. | Acoustic sensor |
US4802227A (en) * | 1987-04-03 | 1989-01-31 | American Telephone And Telegraph Company | Noise reduction processing arrangement for microphone arrays |
US5737431A (en) * | 1995-03-07 | 1998-04-07 | Brown University Research Foundation | Methods and apparatus for source location estimation from microphone-array time-delay estimates |
US5828997A (en) * | 1995-06-07 | 1998-10-27 | Sensimetrics Corporation | Content analyzer mixing inverse-direction-probability-weighted noise to input signal |
DE19540795C2 (en) | 1995-11-02 | 2003-11-20 | Deutsche Telekom Ag | Speaker localization method using a microphone array |
JP3522954B2 (en) | 1996-03-15 | 2004-04-26 | 株式会社東芝 | Microphone array input type speech recognition apparatus and method |
JP3541339B2 (en) * | 1997-06-26 | 2004-07-07 | 富士通株式会社 | Microphone array device |
-
1997
- 1997-09-20 DE DE19741596A patent/DE19741596A1/en not_active Withdrawn
-
1998
- 1998-03-17 US US09/509,135 patent/US6529869B1/en not_active Expired - Lifetime
- 1998-03-17 JP JP2000513442A patent/JP2001517916A/en active Pending
- 1998-03-17 EP EP98916975A patent/EP1016314B1/en not_active Expired - Lifetime
- 1998-03-17 WO PCT/EP1998/001537 patent/WO1999016285A1/en active IP Right Grant
- 1998-03-17 DE DE59804536T patent/DE59804536D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9916285A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2001517916A (en) | 2001-10-09 |
WO1999016285A1 (en) | 1999-04-01 |
EP1016314B1 (en) | 2002-06-19 |
DE19741596A1 (en) | 1999-03-25 |
US6529869B1 (en) | 2003-03-04 |
DE59804536D1 (en) | 2002-07-25 |
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