EP2686845A1 - Procede et systeme de prediction de l'audibilite d'une emergence frequentielle d'un signal - Google Patents
Procede et systeme de prediction de l'audibilite d'une emergence frequentielle d'un signalInfo
- Publication number
- EP2686845A1 EP2686845A1 EP12709111.4A EP12709111A EP2686845A1 EP 2686845 A1 EP2686845 A1 EP 2686845A1 EP 12709111 A EP12709111 A EP 12709111A EP 2686845 A1 EP2686845 A1 EP 2686845A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency
- emergence
- component
- mask
- signal
- 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 description 13
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 238000001914 filtration Methods 0.000 claims description 8
- 230000000873 masking effect Effects 0.000 description 17
- 238000001228 spectrum Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 2
- 241000287107 Passer Species 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
Definitions
- the invention relates to the prediction of the audibility of signals, in particular the audibility of frequency emergences of signals comprising one or more frequency components, and a masking background noise (also called mask).
- a masking background noise also called mask
- Frequency emergences comprise one or more frequency components corresponding to the rai es appearing on the signal spectra.
- the prediction of the audibility of a frequency emergence makes it possible to determine whether a listener will be able to hear this frequency emergence masked by a background noise.
- on-board systems for example alternators, diffibration systems, gearbox gears
- these frequency components are conventionally masked by a background noise of the vehicle.
- This noise mask corresponds for example to the vibrations of the car or to the outside wind.
- detection threshold values can be obtained for a frequency component in the presence of a background noise, for example by performing tests on listeners. It should also be noted that these detection threshold values correspond to detectability indices, characterizing the ability to detect the presence of a frequency emergence in a masking background noise.
- each frequency component when transmitting a frequency emergence comprising a plurality of frequency components, if each frequency component is presented at its detection threshold, known for each component alone in the masking noise, then the frequency emergence is said to be equal.
- the detectability index of each frequency component is the same, and the detectability index of the frequency emergence as a whole is equal to the square root of the number of frequency components multiplied by the detecitability index. a single frequency component presented individually in the mask.
- the methods for detecting equitably detectable frequency emergences do not make it possible to predict the audibility of a non-equi-detectable frequency emergence masked by a complex noise, that is to say having a plurality of frequency components, such that a background noise present when driving a motor vehicle or a train car, the frequency components of which are not at their detection threshold.
- the object of the invention is therefore to solve the disadvantages mentioned above and, in particular, to allow the prediction of The audibility of a frequency emergence masked by a complex background noise.
- a method for predicting the audibility of a frequency emergence of a signal comprising at least one reference frequency component comprising the following steps:
- the level of the reference component obtained by the calculation therefore corresponds to the audibility of the frequency emergence as a whole.
- the level of the reference frequency component corresponding to the audibility of the frequency emergence as a whole is obtained, comparable to the values known by experimentation.
- the difference between, on the one hand, the difference between the level of the component and the detection threshold of the component is calculated for each frequency component. emi alone in the mask and, on the other hand, the difference between the level of the reference component and the detection threshold of the reference component AU is only in the mask.
- a system for predicting the audibility of a frequency emergence of a signal comprising at least one reference frequency component, comprising means for analyzing said signal capable of identifying a noise mask. within said signal and frequency components of the frequency emergence, a plurality of filters whose passbands are respectively centered on the frequency components.
- the system comprises means for calculating the level of the reference frequency component corresponding to the audibility of the frequency emergence as a whole as a function of the level of the mask within each filter, and the detection threshold of each frequency component emitted. alone in the mask.
- the filters are rounded exponential filters.
- the plurality of round exponential filters provides filtering similar to that performed by a human ear.
- the mask can be a car cockpit sound or a train car sound.
- a system capable of predicting the audibility of a frequency emergence of a signal, which may comprise a plurality of frequency components emitted within a complex noise, for example a car or car interior noise. of train.
- FIG. 1 illustrates the spectrum of a signal comprising a plurality of frequency components
- FIG. 2 illustrates the steps of the method according to the invention
- FIG. 1 shows the spectrum of a signal S comprising a frequency emergence composed of five frequency components F1, F2, F3 F4 and F5.
- a masking noise M for example a car interior noise or a train car noise.
- the level of the frequency component Fl emitted in the masking noise M with the frequency components F2-F5 can be modified by the frequency components F2-F5, even if these frequency components are emitted at a level below their detection threshold.
- the comparison of the frequency emergence level Ns and the level of the mask Nm does not allow, after a comparison with the known value of the threshold of detection of the frequency component alone, to predict the audibility of frequency emergence as a whole.
- the sound signal in its entirety is recorded, that is to say the frequency emergence and masking noise.
- This signal may be a signal emitted by an electric motor of a motor vehicle, recorded within the passenger compartment during a running phase of the vehicle.
- a signal analysis step E02 is then implemented, in order to obtain the spectrum of said signal.
- This analysis step may also include the identification of frequency emergence and masking noise.
- step E03 The different frequency components of frequency emergence are then identified during step E03. We In particular, it will be possible to use masking noises previously obtained so as to identify the frequency components.
- step E04 is implemented. This step corresponds to the filtering of the signal by means of a filter whose bandwidth is centered on said single frequency component, for example a rounded exponential filter, so as to obtain, for the filter, the mask alone within the band passer of the filter.
- step E05 In order to determine whether this united frequency component is audible, it is possible to calculate the difference of the frequency emergence level Ns and the mask level Nm (step E05). This difference is then compared to the detection threshold of this frequency component during step E06.
- the threshold of detection of the single frequency component is not modified when this frequency component is emitted in the frequency emergence as a whole, since the spectrum of this frequency emergence includes only the single frequency component. It is thus possible to use a value already known at the detection threshold, for example a value obtained during an experiment, by means of the mask obtained after filtering.
- the obtaining of detection thresholds is in particular described in the document "Psychoacoustics: Facts and model, ZWICKER E. and FASTL H. (1999), 2nd Edition, Springer-Verlag, Berlin".
- the frequency emergence comprises a plurality of frequency components, for example the frequency emergence of the signal S comprising five frequency components F 1 -F 5, then the step E07 is implemented.
- This step E07 corresponds to a filtering of the signal by means of a plurality of filters.
- the bandwidths of these filters are respectively centered on the frequency components of frequency emergence.
- the mask alone is obtained within the bandwidth of the filter. This mask alone makes it possible in particular to determine the mask level and the detection threshold of the frequency component emitted alone in the masking noise.
- five filters can be used for the signal S, whose passbands are respectively centered on the frequency components F 1 -F 5.
- the index i corresponds to a frequency component of the frequency emergence of the signal, between 1 and n, where n is the number of frequency components of frequency emergence.
- the index j corresponds to a reference frequency component selected from among the frequency components.
- a step E08 for determining the levels of the frequency components N j / n and the masks N ilm within each filter is then implemented.
- N j / n corresponds to the level of the frequency component emitted in a frequency emergence comprising n frequency components.
- N ilm corresponds to the level of the mask within the filter centered on the frequency component.
- Step E09 is then implemented. This step corresponds to the determination of the detection thresholds S i of each component emitted alone in the masking noise, in particular by using the level of the mask N ilm .
- This step corresponds to the calculation of the level of each component with respect to its threshold when it is emitted alone in the masking noise, that is to say the calculation of the difference between N j / n and S,.
- Steps E08, E09 and E10 are then repeated during step E1 and for each frequency component of frequency emergence.
- AN UJ (N A -S l ) - (N J / n -S J ) (EQ1)
- step E13 the level of the reference frequency component corresponding to the audibility of the frequency emergence as a whole, denoted S j / n, is calculated.
- the frequency emergence detectability index comprising n frequency components is equal to the square root of the sum of the detectability indices, squared.
- the detectability index of the frequency components alone can be replaced by that of the reference component.
- the equation EQ3 thus makes it possible, during step E13, to calculate the level of the reference frequency component corresponding to the audibility of frequency emergence as a whole, and thus to obtain the audibility of the frequency emergence by comparing this value with the reference frequency component.
- the final step E14 is implemented after the steps E06 and E13 so as to determine whether the frequency emergence is audible. A positive exit from the final step E14 indicates that the listener can hear the frequency emergence emitted in the masking background noise.
- step E13 can be implemented for each component of the frequency emergence, whatever its level in the frequency emergence, by choosing a different reference component.
- the method according to the steps E01 to E14 can be implemented for a plurality of frequency components of frequency emergence, it is thus possible to determine relationships between the frequency components. For example, the presence of certain Frequency components may have a greater influence on the audibility of frequency emergence as a whole than others.
- FIG 3 there is shown schematically a system according to one aspect of the invention.
- This system comprises recording and MEA analysis means capable of receiving a sound signal.
- the recording and analysis means may for example comprise a microcomputer equipped with audio inputs.
- the signal spectrum as well as the mask of this signal are then transmitted to a plurality of FLT filters, for example rounded exponential filters.
- the bandwidths of these filters are respectively centered on the frequency components.
- the filters may especially be those described in the document "GLASBERG and MOORE (2000), Frequency selectivity as a function of level and measured frequency with uniformly excited notched noi, Journal of Acoustical Society of America, 108 (5), 23 1 8 -2328 ".
- the outputs of these filters communicate with calculation means MC, for example e able to implement on the one hand the steps E5 and E6 and on the other hand the steps E08 to E 13.
- This frequency emergence can notably be non-equivilable, for which the method according to the invention is particularly advantageous thanks to a calculation of the detection threshold of each of the components of a frequency emergence comprising a plurality of frequency components, as a function of the thresholds. s detection of other frequency components.
Landscapes
- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1152244A FR2972824B1 (fr) | 2011-03-18 | 2011-03-18 | Procede et systeme de prediction de l'audibilite d'une emergence frequentielle d'un signal |
| PCT/EP2012/054758 WO2012126870A1 (fr) | 2011-03-18 | 2012-03-19 | Procede et systeme de prediction de l'audibilite d'une emergence frequentielle d'un signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2686845A1 true EP2686845A1 (fr) | 2014-01-22 |
| EP2686845B1 EP2686845B1 (fr) | 2015-01-07 |
Family
ID=45841499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12709111.4A Not-in-force EP2686845B1 (fr) | 2011-03-18 | 2012-03-19 | Procede et systeme de prediction de l'audibilite d'une emergence frequentielle d'un signal |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2686845B1 (fr) |
| CN (1) | CN104170010B (fr) |
| FR (1) | FR2972824B1 (fr) |
| WO (1) | WO2012126870A1 (fr) |
-
2011
- 2011-03-18 FR FR1152244A patent/FR2972824B1/fr not_active Expired - Fee Related
-
2012
- 2012-03-19 EP EP12709111.4A patent/EP2686845B1/fr not_active Not-in-force
- 2012-03-19 WO PCT/EP2012/054758 patent/WO2012126870A1/fr not_active Ceased
- 2012-03-19 CN CN201280023429.1A patent/CN104170010B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012126870A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2686845B1 (fr) | 2015-01-07 |
| CN104170010A (zh) | 2014-11-26 |
| FR2972824A1 (fr) | 2012-09-21 |
| FR2972824B1 (fr) | 2013-03-29 |
| CN104170010B (zh) | 2017-03-22 |
| WO2012126870A1 (fr) | 2012-09-27 |
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