CN107077839B - Sound synthesis device for actively rendering vehicle engine noise - Google Patents
Sound synthesis device for actively rendering vehicle engine noise Download PDFInfo
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- CN107077839B CN107077839B CN201580050172.2A CN201580050172A CN107077839B CN 107077839 B CN107077839 B CN 107077839B CN 201580050172 A CN201580050172 A CN 201580050172A CN 107077839 B CN107077839 B CN 107077839B
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Abstract
The invention relates to a sound synthesis device comprising a data reception module (30) responsible for providing data to a sound synthesis module (20) comprising a computer (21) responsible for generating a set of sinusoidal harmonics, each sinusoidal harmonic of said set of sinusoidal harmonics being weighted by an inherent gain, and the summation of said set of sinusoidal harmonics enabling the generation of a synthetic digital signal which is a function of a current value of the engine speed and of a current value of at least one other operating parameter, the selection of at least one predetermined set of consecutive harmonics being implemented in said set of harmonics, the gain associated with the harmonics belonging to said set being a function of the current value of the engine speed and of the current value of said at least one other operating parameter, and the gain associated with the harmonics not belonging to any one of said sets being a function only of the current value of the engine speed.
Description
Technical Field
The present invention relates to the field of harmonic sound synthesis devices for vehicles. The invention relates more precisely to such a device for active rendering of engine noise.
Background
Developments made in the field of automotive acoustics for more than twenty years have made it possible to effectively cope with noise sources (engine noise, running noise, air resistance noise, or noise related to road excitation) inside the vehicle cabin.
These improvements result in a significant reduction in the sound intensity of background noise within the cabin, and therefore also depersonalize the acoustic environment inside the cabin.
In order to provide a sound signature consistent with the vehicle image, some automobile manufacturers propose electronic rendering of vehicle engine noise via a sound synthesis device.
Such devices generally comprise a sound synthesis component responsible for synthesizing an engine noise rendering signal, played by the audio system of the vehicle, according to the current engine speed of the vehicle.
The composite signal is still quite basic because for a given engine speed, the timbre of the composite signal is always the same and does not reflect changes in other power parameters of the vehicle.
French patent application FR2924260 describes a sound synthesis apparatus which generates a more accurate synthesis signal. The device comprises a storage module, a sound synthesis module and a data receiving module (consisting of an engine computer of the vehicle), wherein the data receiving module is responsible for providing digital data for the sound synthesis module, and the digital data represent the current engine speed and the current depth level of an accelerator pedal.
The sound synthesis module generates a set of sinusoidal harmonics, each of which is weighted by an inherent gain, and the summing of the set of sinusoidal harmonics results in a synthesized digital signal that is used to render for vehicle engine noise.
The frequency of each harmonic is determined by a linear relationship as a function of the current engine speed, while the amplitude of each harmonic is determined from a look-up table applied to each harmonic that gives a gain based on the current engine speed and the current depth level of the accelerator pedal.
The device thus generates a composite signal whose tone varies simultaneously as a function of the engine speed and the depth level of the accelerator pedal, which enables a more uniform sound rendering.
Since the device employs a plurality of one-dimensional interpolation tables, the device has the major disadvantage of requiring an exceptionally large amount of storage and computing resources, and is often incompatible with the storage and computing resources available in the vehicle.
Disclosure of Invention
It is therefore an object of the present invention to provide a sound synthesis apparatus capable of generating a rendered signal rendered for vehicle engine noise that is not only efficient but also adapts to the storage and computational resources of existing vehicles.
The invention provides a voice synthesis device for actively rendering vehicle engine noise, comprising a voice synthesis module and a data receiving module, wherein the data receiving module is responsible for providing digital data for the voice synthesis module, and the digital data represents the current value of the engine speed and the current value of at least one other operating parameter of the vehicle;
the sound synthesis module includes a computer responsible for generating a set of sinusoidal harmonics, each sinusoidal harmonic in the set of sinusoidal harmonics being weighted by an inherent gain, and the summing of the set of sinusoidal harmonics enabling generation of a synthetic digital signal for rendering, the synthetic digital signal being a function of a current value of the engine speed and a current value of at least one other operating parameter;
characterized in that the selection of at least one predetermined set of consecutive harmonics is carried out in said set of harmonics, the gain associated with the harmonics belonging to said set being a function of the current value of the engine speed and of the current value of said at least one other operating parameter of the vehicle, and the gain associated with the harmonics not belonging to any one of said sets being a function of the current value of the engine speed only.
Since only a portion of the total number of harmonics has a gain determined in accordance with the current values of a plurality of operating parameters of the vehicle, the sound synthesis apparatus according to the present invention is capable of obtaining a synthesized signal that provides a plurality of timbre variations for a constant engine speed while occupying minimal storage and computational resources to render the sound synthesis apparatus fully compatible with the resources available in existing vehicles.
According to preferred features of the sound synthesis apparatus which may be employed individually or in combination:
-the gain associated with the harmonic belonging to said set is a function of the current value of the engine speed, of the current value of the depth level of the accelerator pedal and of the current value of the speed of the vehicle;
-the gain associated with a harmonic not belonging to any one of said sets is equal to an amplitude coefficient given by a one-dimensional look-up table applicable to said harmonic in function of the current value of said engine speed;
-the gain associated with the harmonic belonging to said set is equal to the sum of said amplitude coefficient and a supplementary amplitude coefficient weighted by a dynamic scaling factor;
-said supplementary amplitude coefficient is given by a one-dimensional look-up table adapted to said harmonic and is a function only of the current value of said engine speed;
-said power scaling factor is given by a two-dimensional look-up table applicable to said harmonics and is a function of the current value of the depth level of the accelerator pedal and the current value of the speed of said vehicle;
-said power scaling factor is equal to the product of two sub-factors, given by two look-up tables applicable to said harmonics, respectively a function of the current value of the depth level of the accelerator pedal and a function of the current value of the speed of the vehicle;
-the set of continuous harmonics is selected according to its influence on the appearance of some timbre features, such as roughness, circularity, motility or bloom;
-the frequency of each harmonic is modulated very slightly around the nominal value of said frequency; and/or
The modulation is given by a low-frequency periodic function or by means of a look-up table.
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Other features and advantages of the invention will become clearer from the following detailed description of an illustrative but not limitative example, and the accompanying drawings, which show on the only figure a functional block diagram of a sound synthesis device according to a preferred embodiment of the invention.
Detailed Description
With reference to fig. 1, the voice synthesizer 1 according to the invention comprises a memory module 10, a voice synthesis module 20 and a data receiving module 30 responsible for providing said voice synthesis module with digital data representative of the current engine speed and of the current depth level of the accelerator pedal.
The data receiving module 30 is preferably formed by the engine computer of the vehicle, since the engine computer has to track the changes of a certain number of power parameters of the vehicle (in particular the instantaneous speed, the engine speed and the depth level of the accelerator pedal) for ensuring the control of the engine. The current values of these various parameters can thus be transmitted by the engine computer directly to the voice synthesis module in digital form without the need to generate additional processing.
In a variant, the data receiving module 30 is coupled with a plurality of components and sensors of the vehicle which transmit to it the current values of some of the dynamic parameters of the vehicle at predetermined time intervals (preferably between 10 and 20 milliseconds). These analog data are then digitally converted so as to be available to the sound synthesis module 20.
The storage module 10 comprises a live memory and a non-volatile memory of the EEPROM or FLASH type, which stores a plurality of look-up tables 11, 12, 13 capable of processing some of the input data transmitted by the data reception module 30.
Each of the look-up tables 11 for a particular harmonic I (I from 1 to I) is based on engine speed RMThe current value of (A) gives the amplitude coefficient AiThe value of (c).
Thus, for example, for a total number of harmonics I equal to 50, the memory module 10 comprises 50 one-dimensional look-up tables 11.
For continuous harmonics J (J from J)aTo Jb(ii) a E.g. for the first set E1：Ja5 and JbFor the second set E82：Ja15 and Jb19) set EkEach of the look-up tables 12 (K from 1 to K) is based on the engine speed RMThe current value of (A) gives the supplementary amplitude coefficient AkThe value of (c).
Thus, for example, for a total number of sets K equal to 5, the memory module 10 comprises 6 one-dimensional look-up tables 12.
Adapted for continuous harmonics FjSet E ofkEach of the look-up tables 13 gives a power scaling factor S based on the depth level P of the accelerator pedal and the speed V of the vehiclekThe value of (c).
Thus, for example, for a total number of sets K equal to 5, the memory module 10 comprises 5 two-dimensional lookup tables 13.
Generally, due to the limited number of two-dimensional look-up tables in relation to the total number of harmonics, the memory resources required by the sound synthesis apparatus 1 are still particularly reasonable and compatible with the memory resources currently available in the vehicle.
A set of look-up tables 11, 12, 13 stored in the module 10 is applicable to a given power plant of a particular vehicle type: the values contained in these tables are determined empirically after having undergone tests carried out in the laboratory.
The sound synthesis module 20 is responsible for generating, via the computer 21, a set of sinusoidal harmonics, each of which is weighted by an inherent gain, and the summation of which enables to obtain a synthetic digital signal S for rendering for the vehicle engine noise.
The composite signal is thus defined by the following equation:
wherein, FiAnd GiCorresponding to the current gain of the harmonic with frequency and index i, respectively.
The computer 21 may be constituted, for example, by a microprocessor of the DSP ("Digital Signal Processing") type, which has a minimum operating frequency in the order of megahertz (MHz) in order to be able to perform adequately operations on a time base with a maximum audible frequency of sound in the order of 20 kHZ.
Frequency F of each of the harmonics iiBy the current engine speed R of the vehicleMIs determined by a linear function defined by the following formula:
where C is a constant predetermined according to the characteristics of the engine (particularly the number of cylinders included in the engine).
Gain G of each of the harmonics iiThis is determined by means of a look-up table 11, 12, 13 stored in a memory in the module 10, the calculation method for obtaining this gain depending on whether the harmonic belongs to the harmonic set E or notkOne is different.
For groups not belonging to these sets EkIs given by the comparison table 11 applicable to the harmonic and is only the engine speed R, the associated gain G is equal to the amplitude coefficient aMAs a function of the current value of.
For groups belonging to these sets EkThe harmonic i of one of, the associated gain G is obtained by the following equation:
Gi＝Ai+(Ai*Sk)，
wherein,
-Akcorresponding to the supplementary amplitude coefficient given by the look-up table 12 for this harmonic and only the engine speed RMA function of the current value of; and
-Skcorresponds to the power scaling factor given by the look-up table 13 applicable to this harmonic and is a function of the current value of the depth level P of the accelerator pedal and the current value of the vehicle speed V.
Set of consecutive harmonics EkSelected according to the effect of the set of consecutive harmonics on the appearance of some timbre characteristic, such as roughness, circularity, motility, or bloom.
Thus, for a total number of harmonics I equal to 50, for example two sets of consecutive harmonics E1 and E2 are selected, corresponding to harmonics 5 to 8 and 15 to 19, respectively, and associated with two particular timbre features.
The sound synthesis device 1 also comprises a mixing module 40 responsible for ensuring the dynamic control of the amplitude of the synthesis signal S according to the current values of some of the vehicle dynamics parameters delivered by the module 30 and mixing this signal with other digital sound sources of the vehicle.
At the output of the mixing module 40, the digital/analog converter 50 is able to convert the mixed digital signal into an analog sound signal, which is then passed in an analog amplifier 60 by means of one or more loudspeakers 70 before being played in the vehicle. The analog amplifier 60 may be, for example, an analog amplifier commonly found in all audio playback devices.
According to an embodiment variant of the sound synthesis device according to the invention, the dynamic scaling factor SkEqual to two sub-factors S given by two look-up tables applicable to the harmonick1And Sk2Is a function of the current value of the depth level P of the accelerator pedal and a function of the current value of the vehicle speed V.
The advantage of this variant is that it takes less memory resources, since it only uses a one-dimensional look-up table. As a compensation, the timbre of the synthesized sound signal is slightly less fine than the timbre of the sound signal generated by the sound synthesizing apparatus 10.
According to other implementation variants, the frequency of each harmonic i is modulated very slightly around the nominal value of this frequency (this modulation phenomenon is usually named by the english term "jitter").
The frequency F of each of the harmonics i is thus defined by the following equation:
wherein FiGiven by a low frequency periodic function (sinusoidal or other type) or by means of a look-up table.
The addition of this "beat" ensures a better mixing of the different harmonics and avoids modulation phenomena that may occur due to certain phase combinations between the harmonics generated by the vehicle engine and the harmonics generated by the sound synthesis device according to the invention.
The invention is of course not limited to the embodiments described and illustrated, but encompasses all implementation variants available to the person skilled in the art.
Claims (10)
1. A sound synthesis device for active rendering of vehicle engine noise, the sound synthesis device comprising a sound synthesis module (20) and a data receiving module (30) responsible for providing digital data to the sound synthesis module (20), the digital data being representative of an engine speed (R |)M) And a current value of at least one other operating parameter of the vehicle,
the sound synthesis module (20) comprises a computer (21) responsible for generating a set of sinusoidal harmonics, each sinusoidal harmonic of the set of sinusoidal harmonics being weighted by an intrinsic gain (G), and the summation of the set of sinusoidal harmonics enabling the generation of a synthetic digital signal (S) for rendering, the synthetic digital signal being the engine speed (R;)M) And the current value of at least one other operating parameter,
characterized by at least one predetermined set of consecutive harmonics (E)k) Is implemented in the group of harmonics and belongs to the set (E)k) Is the engine speed (R)M) And the current value of said at least one other operating parameter of said vehicle, without belonging to any one of said sets (E)k) Is only the engine speed (R)M) As a function of the current value of.
2. Sound synthesis device according to claim 1, characterized in that it belongs to said set (E)k) Is the engine speed (R)M) A current value of the depth level (P) of the accelerator pedal and a current value of the speed (V) of said vehicle.
3. The method according to claim 1 or 2Is characterized by not belonging to any one of said sets (E)k) Is equal to an amplitude coefficient (A) determined by a one-dimensional look-up table (11) adapted to said harmonic as a function of said engine speed (R)M) The current value of (a) is given.
4. Sound synthesis device according to claim 3, characterized in that it belongs to said set (E)k) Is equal to the amplitude coefficient (A) and the power scaling factor (S)k) Weighted supplementary amplitude coefficient (A)k) The sum of (1).
5. Sound synthesis device according to claim 4, characterized in that the supplementary amplitude coefficient (A)k) Is given by a one-dimensional look-up table (12) adapted to the harmonics and is only the engine speed (R)M) As a function of the current value of.
6. Sound synthesis device according to claim 4 or 5, characterized in that the dynamic scaling factor (S)k) Is given by a two-dimensional look-up table (13) adapted to said harmonics and is a function of the current value of the depth level (P) of the accelerator pedal and the current value of the speed (V) of said vehicle.
7. Sound synthesis device according to claim 4 or 5, characterized in that the dynamic scaling factor (S)k) Equal to two sub-factors (S) given by two look-up tables applicable to said harmonicsk1，Sk2) Is a function of the current value of the depth level (P) of the accelerator pedal and of the current value of the speed (V) of the vehicle.
8. Sound synthesis device according to one of claims 1, 2, 4, 5, characterized in that the set of consecutive harmonics (E)k) Selected according to the effect of the set of consecutive harmonics on the rendering of some timbres characteristicCharacteristics such as roughness, roundness, motility, or bloom.
9. Sound synthesis device according to one of claims 1, 2, 4, 5, characterized in that the frequency of each harmonic is modulated very slightly around the nominal value of the frequency.
10. Sound synthesis device according to claim 9, characterized in that the modulation is given by a low-frequency periodic function or by means of a look-up table.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1458840A FR3026218B1 (en) | 2014-09-18 | 2014-09-18 | SOUND SYNTHESIS DEVICE FOR THE ACTIVE COLORING OF THE NOISE OF A VEHICLE ENGINE |
| FR1458840 | 2014-09-18 | ||
| PCT/FR2015/052453 WO2016042244A1 (en) | 2014-09-18 | 2015-09-14 | Sound synthesis device intended for the active coloration of the noise of a vehicle engine |
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| Publication Number | Publication Date |
|---|---|
| CN107077839A CN107077839A (en) | 2017-08-18 |
| CN107077839B true CN107077839B (en) | 2020-12-08 |
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| CN201580050172.2A Active CN107077839B (en) | 2014-09-18 | 2015-09-14 | Sound synthesis device for actively rendering vehicle engine noise |
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|---|---|
| EP (1) | EP3195305B1 (en) |
| CN (1) | CN107077839B (en) |
| FR (1) | FR3026218B1 (en) |
| WO (1) | WO2016042244A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108032800B (en) * | 2017-12-06 | 2020-11-20 | 滁州松泽电器有限公司 | Sound synthesis method and device and electronic equipment |
| EP3503089B1 (en) | 2017-12-22 | 2023-10-18 | Marelli Europe S.p.A. | Apparatus for the active control of the sound of the engine of a land vehicle and corresponding method |
| CN111798831B (en) * | 2020-06-16 | 2023-11-28 | 武汉理工大学 | Sound particle synthesis method and device |
| CN115019765A (en) * | 2022-06-30 | 2022-09-06 | 浙江吉利控股集团有限公司 | Active sound acquisition method and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2974441A1 (en) * | 2011-04-19 | 2012-10-26 | Renault Sa | GENERATING A ROTATING MACHINE SOUND OF AN APPARATUS |
| CN103625395A (en) * | 2013-12-05 | 2014-03-12 | 合肥工业大学 | System for improving in-vehicle moving sound sensing quality of electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4384681B2 (en) * | 2007-07-25 | 2009-12-16 | 本田技研工業株式会社 | Active sound effect generator |
| US8320581B2 (en) * | 2010-03-03 | 2012-11-27 | Bose Corporation | Vehicle engine sound enhancement |
| US9299337B2 (en) * | 2011-01-11 | 2016-03-29 | Bose Corporation | Vehicle engine sound enhancement |
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2014
- 2014-09-18 FR FR1458840A patent/FR3026218B1/en not_active Expired - Fee Related
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2015
- 2015-09-14 EP EP15771689.5A patent/EP3195305B1/en active Active
- 2015-09-14 CN CN201580050172.2A patent/CN107077839B/en active Active
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2974441A1 (en) * | 2011-04-19 | 2012-10-26 | Renault Sa | GENERATING A ROTATING MACHINE SOUND OF AN APPARATUS |
| CN103625395A (en) * | 2013-12-05 | 2014-03-12 | 合肥工业大学 | System for improving in-vehicle moving sound sensing quality of electric vehicle |
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| Publication number | Publication date |
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| CN107077839A (en) | 2017-08-18 |
| WO2016042244A1 (en) | 2016-03-24 |
| EP3195305B1 (en) | 2020-10-28 |
| FR3026218B1 (en) | 2016-10-28 |
| EP3195305A1 (en) | 2017-07-26 |
| FR3026218A1 (en) | 2016-03-25 |
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