EP3178184A2 - Verfahren zur senkung der verständlichkeit von sprachsignalen und trennbauteil zur beeinflussung der schallübertragung - Google Patents
Verfahren zur senkung der verständlichkeit von sprachsignalen und trennbauteil zur beeinflussung der schallübertragungInfo
- Publication number
- EP3178184A2 EP3178184A2 EP15750979.5A EP15750979A EP3178184A2 EP 3178184 A2 EP3178184 A2 EP 3178184A2 EP 15750979 A EP15750979 A EP 15750979A EP 3178184 A2 EP3178184 A2 EP 3178184A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sound
- speech signal
- separating component
- masking sound
- masking
- 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
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005540 biological transmission Effects 0.000 title claims abstract description 13
- 230000000873 masking effect Effects 0.000 claims abstract description 97
- 238000012545 processing Methods 0.000 claims abstract description 12
- 230000001419 dependent effect Effects 0.000 claims abstract description 7
- 238000009413 insulation Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- 230000002123 temporal effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 230000002238 attenuated effect Effects 0.000 claims description 2
- 238000013459 approach Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 206010013647 Drowning Diseases 0.000 description 1
- 241001441723 Takifugu Species 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 208000018459 dissociative disease Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000001755 vocal effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
- H04K3/825—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection by jamming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/45—Jamming having variable characteristics characterized by including monitoring of the target or target signal, e.g. in reactive jammers or follower jammers for example by means of an alternation of jamming phases and monitoring phases, called "look-through mode"
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K2203/00—Jamming of communication; Countermeasures
- H04K2203/10—Jamming or countermeasure used for a particular application
- H04K2203/12—Jamming or countermeasure used for a particular application for acoustic communication
Definitions
- Patent application Method for reducing the intelligibility of speech signals and separating component for influencing the sound transmission
- the invention relates to a method for reducing the intelligibility of speech signals and a separating component for influencing the sound transmission. It should serve to avoid disturbances and fend off eavesdropping attacks. State of the art
- Sound attenuation a low volume level can be achieved in open-plan offices, the distraction is relevant by a voice signal.
- One approach is to superimpose the speech signal with a noise signal, making it incomprehensible
- Overlay sound is created.
- the disadvantage of this is that the overlay sound has a comparatively high noise level.
- interceptibility includes, for example, the omission of windows, a complete solid construction, protection against structure-borne sound propagation and absolutely unadorned spaces
- Vibration damping or superposition done. It proves to be particularly valuable at low frequencies, because in this area the sound insulation of all walls, Ceiling etc. total or partially resonance-like low. However, the frequency range of intelligible speech is at medium and high frequencies, where an increased sound attenuation with active systems is not or hardly achievable.
- one approach to reducing the ability to intercept is to overlay speech with masking signals so that a sound may be heard or detected but its content is incomprehensible.
- these masking systems must alienate the outgoing voice content so that it can not be decrypted. Both the word and the sentence intelligibility must therefore be reduced to a semantically unconstructable measure.
- no noticeable acoustic disturbance (annoyance) may occur in the room or outside, since this depends on the acceptance by the users. An all-drowning noise is therefore not an acceptable solution as it would have to significantly exceed the speech signal level.
- the coherent speech signal is at least partially extracted from the incoherent noise
- a method is known from US 3,213, 199 A in which sound is recorded in a room with a microphone
- Neighboring room is bugged, a speaker is provided, which depends on the frequency and the amplitude of the sound recorded in the room at any time
- Neighborhood generates a masking sound.
- Masking sound with a variety of microphones and a speaker known. Speech signals and ambient signals are recorded. Depending on this, a masking sound is generated.
- WO2004 / 107806 A1 discloses a system with which sound can be masked.
- US 2005/0065778 A1 discloses an apparatus and a method for masking speech sound.
- Masking signal can be varied in certain periods of time.
- the time periods may have a fixed, variable or random length.
- a so-called “babble generator” a speech-like signal, an artificial voice is generated as a masking signal, and then the artificial speech signal generated in the "babble generator” is superimposed on the masking signal with the actual speech signal.
- Masking systems for a room thus consist both in minimizing speech intelligibility and preventing reconstructability of the outwardly-urging speech signal as well as in a minimized acoustic disturbance potential for the users of the adjoining rooms.
- the object of the invention is therefore to provide a method with which a speech signal can be made incomprehensible in an improved manner. It is also a task Improved privacy from rooms where confidential discussions are conducted.
- the solution is given in the independent claims.
- the dependent claims teach advantageous embodiments.
- the description and the drawings give further explanation.
- Speech signal is so dependent that arises by superimposition of the speech signal with the masking sound an incomprehensible overlay sound, wherein the
- the core idea is therefore that the masking sound depends in a differentiated manner on the speech signal whose intelligibility it is to be lowered, and is specifically adapted to the speech signal.
- the prior art is that a masking sound with a higher
- volume is provided when the speech signal is louder.
- the invention uses a masking sound which is matched to the speech signal and, in addition to the amplitude, also takes account of the time and frequency of the speech signal, can already be superposed with a volume in the range of the volume of the speech signal to form an incomprehensible overlay sound. So it is possible that the
- Overlay sound does not have a much higher volume than the voice signal.
- the masking sound itself can be a more or less understandable speech sound.
- In the prior art is due to non-specific noise, which louder than that
- Speech signal is, the speech signal simply drowned out, so that the overlay sound is not understandable.
- the masking sound could also be quieter than the voice signal.
- the overlay sound is a bit louder than the voice signal, but not significantly louder.
- Masking sounds are therefore eliminated.
- the detection of the speech signal, the generation of the masking sound and the consequent superimposition take place at different locations.
- the speech signal has a certain duration, until it comes to the superposition with the masking sound. This time can be used to create the masking sound.
- the speech signal is split into intervals.
- the masking sound is formed by temporal inversion of the short intervals.
- a new signal is generated from the amplitude and the frequency of the primary signal, that is to say of the detected speech signal.
- the generation of the masking sound is subject to a random change. It is understood that this random change must remain within a framework that ensures that the overlay sound remains incomprehensible.
- the lowering of the intelligibility of a speech signal can also serve the eavesdropping of a Prevent conversation.
- a generation of the masking sound according to an always unchanged method, according to the invention the change in the masking results not from the change in the masking rule but from the variation of the interval length, cause the process is detected by the eavesdropper and thus a reconstruction of the speech signal would be possible.
- the time intervals are changed randomly in a range of 20 ms to 200 ms, in particular in a range of 50 ms to 100 ms.
- an insulation and / or attenuation of the speech signal is taken into account in the generation of the masking sound, wherein in particular a
- Masking sound is provided at low volume, when the overlay sound from the superposition of the masking sound with the insulated and / or attenuated speech signal. It will be possible in many cases to insulate or dampen the speech signal before it enters an area in which a disturbance or a bugging attack is to be fought off. Thus, a masking sound with lower volume is sufficient. Accordingly, the overlay sound is also less loud, so that possible disturbances are further lowered. As far as above a comparison between the volume of the masking sound, the overlay sound and the
- Speech signal is made, it is useful to turn off the speech signal after an eventual insulation or damping. As mentioned above, it is particularly important to increase the privacy of rooms.
- the invention therefore also relates to a separating component for separating a room from a room environment.
- the separating component contains sensors, actuators and a signal processing unit for influencing the sound transmission.
- the separating component is characterized by the following components:
- the masking sound depends on the amplitude, time and frequency of the speech signal. As already explained above, it is not enough to the volume alone
- a signal processing unit which can process the signals detected by the sensors so that the
- Actuators can generate such a masking that an incomprehensible overlay sound is created by superimposing the masking sound with the speech signal in the room environment, without the overlay sound must have a much higher volume than the speech signal.
- the masking sound itself has about the volume of the speech signal in the room environment, but can also be quieter.
- the sensors and the actuators are spaced in a defined manner, so that the speech signal has a certain transit time until it comes to superimposing with the masking sound.
- the sensors and actuators are also spaced. As has been recognized in the context of the present invention, the distance can not be considered or even used.
- the speech signal In a microphone as a sensor in the middle of the room, as shown in FIG. 1 of US Pat. No. 3,211,399 A, the speech signal has arrived faster from a speaker near the dividing wall at the dividing wall than at the microphone. For a speaker sitting away from the partition, the voice signal is more likely to be on the microphone than on the partition.
- the signal processing unit is designed to delay the masking sound with respect to the speech signal in time to run times of the speech signal in
- the duration of the electrical signal from the sensors and the signal processing unit to the actuators is usually much shorter than the duration of the sound in the separation component. If the sensors in the area of the side of the separating component facing the room and the actuators in the region of the side of the separating component facing the room environment are now to be taken into account, this duration of the sound from the sensors to the actuators must be considered.
- This transit time is advantageously used according to the invention in that the time delay resulting from the signal propagation time is sufficiently designed such that the signal processing unit transmits the masking sound directly, i. generate in real time and provide for the overlay.
- the separation component is designed so that the generation of the masking sound is subject to a random change.
- the generation of the masking sound can be reproduced, if at all, only with great difficulty. This prevents the speech signal from being reconstructed.
- the change must be within limits that allow the generation of incomprehensible overlay sound.
- the separating component is designed so that the method described above can be carried out with all its advantages.
- the separating component is designed to be multi-layered or multi-shelled. Such structures are common and readily available. In addition, gaps are realized, so that there about the signal processing unit can be accommodated well.
- the separating component is set up in such a way that the masking sound is superposed with the speech signal within the separating component. It can thus be achieved that in a region of the room environment facing the room environment
- Separating component forms a structure-borne sound that radiates incomprehensible overlay sound into the room environment.
- the separating component is set up so that in the room environment, a superposition of the passing through the separating member portion of the speech signal with the masking sound. This is especially the case when the actuators for generating the masking sound are located on the side of the separating component facing the room environment. In this case, a portion of the speech signal greatly reduced by the separating component passes through the
- Room environment facing region of the separation component forms a structure-borne sound that radiates incomprehensible overlay sound into the room environment, a wiretapping attack should be even more difficult. A tapping the structure-borne sound on the room environment facing side is no longer possible.
- the sensors are designed as vibroacoustic sensors. Vibroacoustic sensors are suitable for the accurate detection of a speech signal.
- Speech signal attached to the room-facing side of the separating member or in this area.
- the speech signal has the highest intensity, so that sensors there can capture the speech signal well.
- the actuators for generating the masking sound on the room environment facing side of the separating member or in this area are attached. The masking sound is in the
- FIG. 1 which shows a schematic representation of a double-shell partition wall with a vibroacoustic system integrated according to the invention for masking the speech sound transmission between two rooms, will be described below
- a vibroacoustic speech signal masking system comprises (vibro-) acoustic sensors 4 and actuators 5 and a signal processing module 6, which are integrated into the multi-shell separating component 1.
- a modified speech signal 9 serving as a masking sound is generated in real time from the primary speech signal 8 detected on the room side 7 of the separating component 1, which is fed by means of the actuators 5 into the multi-layered separating component 1 or, preferably, its outer side 1 0 Sound emission stimulates.
- the type, number and distribution of the sensors 4, actuators 5, etc. depends, inter alia, on the construction of the separating component 1.
- the superimposed radiation of both signals ie the insulated primary sound signal 1 1 and the modified voice or masking signal 9, on the outside 10 leads to a quiet and incomprehensible overlay sound 1 2.
- the above-mentioned generation of the modified speech signal 9 in Real time should simply mean that the superposition of the primary speech signal 8 and the modified speech signal 9 to the overlay sound in the external environment 3 must be done simultaneously.
- the primary speech signal 8 needs from the vibrating acoustic sensors 4 to the Actuators 5 a certain duration. This is advantageous in that the generation of the modified speech signal 9 takes some time.
- junction boxes for electrical power or data networks to be integrated directly into the component.
- the component room side can also be provided with a header shell, for ceilings z. B. also in the form of a floating screed, the
- Voice masking system finds its place in the gap between header shell and solid component.
- the attachment shell generally does not serve sound-insulating purposes, but can also act as a sound absorber in room 2 to improve room acoustics.
- the Mehrschaltechnik or multi-layer offers the advantage that the emitted from the outside 10 of the separating component 1 masking sound 9, the space 2 is not or only weakly achieved space and thus is not perceived as disturbing.
- an asymmetrical structure of the separating component 1 is of particular importance.
- the algorithm for generating the modified speech signal 9 accesses the detected primary speech signal 8. The detection is followed by filtering, time delay and temporal inversion of separate signal sections.
- the known sound transmission properties level, phase and
- Original speech signal achieves a significantly higher masking effect, as the superposition with the known, usually differently filtered noise signals. This realization was created in the context of language masks between workplaces in open-plan offices in order to reduce the disruptive effect of intelligible main language.
- the speech masking according to the invention depends on the language prevailing in the application, since the speech patterns differ. Although nothing changes at the basic manipulation steps, some details, e.g.
- Speech recognition can be integrated in two main ways. On the one hand, it distinguishes speech from other non-speech sounds. Such algorithms already exist. On the other hand, it recognizes the language family.
- a supplemental feature is a type of feedback structure that allows the success and level of speech intelligibility to be checked in near real-time to then adjust the parameters of the masking sound to be generated.
- flanking components e.g. on walls that are perpendicular to the actual separation component 1 and allow longitudinal sound transmission between rooms. Analogously, the flanking applies
- the application of the vibroacoustic system and method according to the invention for speech masking is not limited to buildings, but can also be applied in
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014111365.9A DE102014111365A1 (de) | 2014-08-08 | 2014-08-08 | Verfahren zur Senkung der Verständlichkeit von Sprachsignalen und Trennbauteil zur Beeinflussung der Schallübertragung |
PCT/EP2015/068222 WO2016020511A2 (de) | 2014-08-08 | 2015-08-07 | Verfahren zur senkung der verständlichkeit von sprachsignalen und trennbauteil zur beeinflussung der schallübertragung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3178184A2 true EP3178184A2 (de) | 2017-06-14 |
EP3178184B1 EP3178184B1 (de) | 2021-04-28 |
Family
ID=53879488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15750979.5A Active EP3178184B1 (de) | 2014-08-08 | 2015-08-07 | Trennbauteil zur beeinflussung der schallübertragung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3178184B1 (de) |
DE (1) | DE102014111365A1 (de) |
WO (1) | WO2016020511A2 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10354638B2 (en) * | 2016-03-01 | 2019-07-16 | Guardian Glass, LLC | Acoustic wall assembly having active noise-disruptive properties, and/or method of making and/or using the same |
US10134379B2 (en) | 2016-03-01 | 2018-11-20 | Guardian Glass, LLC | Acoustic wall assembly having double-wall configuration and passive noise-disruptive properties, and/or method of making and/or using the same |
US20170256251A1 (en) * | 2016-03-01 | 2017-09-07 | Guardian Industries Corp. | Acoustic wall assembly having double-wall configuration and active noise-disruptive properties, and/or method of making and/or using the same |
US20180268840A1 (en) * | 2017-03-15 | 2018-09-20 | Guardian Glass, LLC | Speech privacy system and/or associated method |
US10373626B2 (en) | 2017-03-15 | 2019-08-06 | Guardian Glass, LLC | Speech privacy system and/or associated method |
US10304473B2 (en) | 2017-03-15 | 2019-05-28 | Guardian Glass, LLC | Speech privacy system and/or associated method |
US10726855B2 (en) | 2017-03-15 | 2020-07-28 | Guardian Glass, Llc. | Speech privacy system and/or associated method |
CN114474393B (zh) * | 2021-12-31 | 2024-01-19 | 三一汽车制造有限公司 | 料仓料位监控方法、装置及搅拌站 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3213199A (en) * | 1962-01-02 | 1965-10-19 | Bissett Berman Corp | System for masking information |
FR2726115B1 (fr) * | 1994-10-20 | 1996-12-06 | Comptoir De La Technologie | Dispositif actif d'attenuation de l'intensite sonore |
DE19826171C1 (de) | 1998-06-13 | 1999-10-28 | Daimler Chrysler Ag | Verfahren und Vorrichtung zur aktiven Beeinflussung von von Fensterscheiben stammenden Geräuschen |
GB9927131D0 (en) * | 1999-11-16 | 2000-01-12 | Royal College Of Art | Apparatus for acoustically improving an environment and related method |
JP2006526921A (ja) * | 2003-06-02 | 2006-11-24 | フェオニック ピーエルシー | オーディオシステム |
US20050065778A1 (en) * | 2003-09-24 | 2005-03-24 | Mastrianni Steven J. | Secure speech |
CA2461148A1 (en) * | 2004-01-27 | 2005-07-27 | Rafik Goubran | Adaptive sound scrambling system and method |
US7376557B2 (en) * | 2005-01-10 | 2008-05-20 | Herman Miller, Inc. | Method and apparatus of overlapping and summing speech for an output that disrupts speech |
DE102005044448B3 (de) | 2005-09-09 | 2006-12-21 | Universität Stuttgart | Einrichtung zur aktiven und/oder passiven Schwingungsbeeinflussung eines transparenten, dünnwandigen Elements und deren Verwendung |
US8620003B2 (en) * | 2008-01-07 | 2013-12-31 | Robert Katz | Embedded audio system in distributed acoustic sources |
US8045725B2 (en) * | 2009-04-16 | 2011-10-25 | GM Global Technology Operations LLC | Vehicle interior active noise cancellation |
US8972251B2 (en) * | 2011-06-07 | 2015-03-03 | Qualcomm Incorporated | Generating a masking signal on an electronic device |
-
2014
- 2014-08-08 DE DE102014111365.9A patent/DE102014111365A1/de not_active Ceased
-
2015
- 2015-08-07 WO PCT/EP2015/068222 patent/WO2016020511A2/de active Application Filing
- 2015-08-07 EP EP15750979.5A patent/EP3178184B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
WO2016020511A2 (de) | 2016-02-11 |
EP3178184B1 (de) | 2021-04-28 |
DE102014111365A1 (de) | 2016-02-11 |
WO2016020511A3 (de) | 2016-04-07 |
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