EP1403850A1 - Verfahren und Vorrichtung zur Erzeugung und zum Gebrauch einer Klangbibliothek um die akustische eigenschaften eines Wagensmotors darzustellen - Google Patents

Verfahren und Vorrichtung zur Erzeugung und zum Gebrauch einer Klangbibliothek um die akustische eigenschaften eines Wagensmotors darzustellen Download PDF

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Publication number
EP1403850A1
EP1403850A1 EP03292384A EP03292384A EP1403850A1 EP 1403850 A1 EP1403850 A1 EP 1403850A1 EP 03292384 A EP03292384 A EP 03292384A EP 03292384 A EP03292384 A EP 03292384A EP 1403850 A1 EP1403850 A1 EP 1403850A1
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EP
European Patent Office
Prior art keywords
frequency
sounds
restitution
blocks
recorded
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Application number
EP03292384A
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English (en)
French (fr)
Inventor
Laurent Clairon
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Virtuel 10
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Virtuel 10
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Application filed by Virtuel 10 filed Critical Virtuel 10
Publication of EP1403850A1 publication Critical patent/EP1403850A1/de
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    • 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
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/02—Synthesis of acoustic waves

Definitions

  • the invention relates to methods for developing and restoring a sound library representing acoustic characteristics of a motor vehicle in the form of sound sequences. It has applications in the automotive and leisure fields by simulating the sounds of an engine or other elements of an automobile. A device for implementation is also claimed.
  • the essence of the invention is to simulate inside the passenger compartment of a motor vehicle the sound of an engine and / or other members including in particular, the brakes, the exhaust, of another type of vehicle and preferably a prestigious or original vehicle.
  • the driver on board his vehicle will have the impression of being inside a Ferrari® or any other type of vehicle that may interest him.
  • the simulation is carried out according to the actual operating state of the engine. It can also be implemented on or in other types of vehicles than a car and, for example, a truck, a bus, a motorcycle.
  • the present invention provides an alternative to these known devices in which sounds are used which are processed before being recorded in the device. These sounds are chosen according to the operating conditions of the motor, in particular the frequency of rotation, this also allowing the activation or the putting on standby of the device.
  • a specific processing of the recording sound makes it possible to reduce the amount of data to be stored in memory unlike the devices in which the sounds are recorded raw or with simple filtering. With the same amount of memory, more simulation possibilities are available. This treatment requires calculations upon return. However, these calculations are simplified and reduced compared to the methods implementing a synthesis.
  • the invention therefore relates to a method of developing a sound library representing the acoustic characteristics of sequences of sounds recorded from at least one reference motor vehicle, each sequence corresponding to operating conditions of the reference vehicle, the conditions of being defined by at least one operating parameter, the recorded sounds being intended to be reproduced later on a motor vehicle by selection as a function of the operating conditions of the motor vehicle on which the reproduction takes place, at least one of the parameters being the frequency of rotation of the motor.
  • the parallel recording of the parameters corresponding to the operating conditions is intended to subsequently allow the selection of sounds as a function of the operating conditions of the engine on which the restitution takes place. If this recording of the parameters can be continuous, preferably for the restitution, a minimum number of parameter values is associated with each sequence or block, in particular in the case of blocks, only one parameter value is stored for each parameter of the block defining the operating conditions, this in order to reduce the quantity of information associated with each sequence or block of sounds.
  • the directory we have for each sequence or block, the values of the parameters and addresses (physical or symbolic address: file name for example) of start and end of the sequence or block (you can also have the start address and the size), the other stored data sets, the sound files, corresponding to sequences or blocks of sounds.
  • the device determines the current operating condition, searches the directory for a correspondence which will enable it to determine the address of the sound data.
  • data concerning the frequency transpositions and of scaling of the parameters are stored so that the rendering device can correctly calculate the conditions of restitution.
  • the sound sequences may correspond to changing operating conditions of the reference vehicle, for example a progressive depressing of the accelerator pedal so that the engine speed rises during the sequence.
  • the block cutting is intended to form blocks which, each in themselves, correspond to relatively stable conditions of the parameters, for example 1 st block at 1000 rpm, 2 nd block at 1100 rpm, 3 rd at 1200rpm, etc. We may have to keep only certain blocks depending on the definition step we want.
  • the sequences can also correspond to stable operating conditions. In all cases, a block must correspond to substantially stable operating conditions.
  • the choice of the reference frequency F 0 makes it possible to optimize the process according in particular to objectives of quality of reproduction.
  • the invention also relates to a method for restoring recorded sounds from a sound library according to any one of the preceding characteristics taken individually or in combination, by selection of recorded digital sounds whose fundamental frequency is substantially equal to the reference frequency F 0 , as a function of operating conditions of a motor vehicle on which restitution takes place, the operating conditions being defined by operating parameters and at least one of the parameters being the frequency of rotation of said motor.
  • the sound library and the restitution can therefore be more or less extensive.
  • the sound library only includes sounds from a single source and a single type of vehicle, in this case the parameters intended to allow the selection of sounds may not include a source type parameter and / or vehicle types, only the operating parameters, for example engine speed (rotation frequency), then being used.
  • several sounds of different source types can be recorded in a sound library with their corresponding source type parameters and the restitution can combine sequences / blocks of several source types. It is understood that in this case, it is preferable that the reference frequency F 0 is the same for all the sequences / blocks of all the source types in order to simplify the restitution.
  • the restitution will only concern one type of vehicle particular, the sequences / blocks being selected according to the corresponding vehicle type parameter.
  • the present invention finally relates to a device for implementing the above methods and in particular for the reproduction from the sound library of digitized sounds recorded and transposed to a reference frequency F 0 .
  • the device comprises at least one computer means of the microprocessor, microcontroller or digital signal processing processor (DSP), program memory for execution according to the restitution method, sound memory comprising the sound library, interpolation means / decimation, said interpolation / decimation means preferably being software and at least one digital analog converter (DAC).
  • DSP digital signal processing processor
  • the invention is characterized during the development of the sound library by a step of frequency transposition on the sounds recorded so that they all have the same fundamental frequency F 0 .
  • the sounds are selected according to the current operation of the engine measured by one / several parameters then change of scale of the measurement to theoretical value of the parameter (s) (the scales of parameters not being the same between the recording vehicle and the engine with restitution engine).
  • s the scales of parameters not being the same between the recording vehicle and the engine with restitution engine.
  • a calculation can be made in order to refine the restitution (in particular weighted combination or interpolation).
  • the selected sounds which are always at the fundamental frequency F 0 must be offset frequently by an interpolation or decimation as a function of a fundamental restitution frequency F r determined according to the measurements (or, rather, of the theoretical value of / parameters which is taken from it).
  • Figure 1 which schematically represents a device usable to simulate the sound of an engine in a motor vehicle from a sound library
  • a controller 4 which can be a microcontroller, a microprocessor or a digital signal processor (DSP), connected by addressing and data buses to memories.
  • a read only memory 6 for storing the operating program.
  • the ROM also contains the sound library (digital samples and parameters) and any configuration data intended to establish a relationship between the parameters on recording and the current parameters, for example the range of frequency (speed) of the engine which may be different. between the registration car and the return car.
  • the controller 4 is also associated with random access memory 7 and with a digital or analog converter 8 (DAC) mono or stereo (or more) as the case may be.
  • An amplifier 9 is provided at the output of the DAC.
  • a means of adjusting the sound level being able to be produced by software by logical shift operations of the digital data, no conventional means of potentiometer type adjustment has been shown
  • the load C of engine 2 is evaluated by the position of the accelerator.
  • the engine R speed 1 (rotation frequency) is evaluated by the engine rotation speed (specific sensor).
  • the corresponding signals 1 and 2 are sent to the controller 4 via a module 3 for shaping the signals.
  • the signal shaping module 3 transforms the analog signal of the engine speed R into a filtered logic signal whose frequency reflects the state of the engine.
  • the engine R speed 1 and the engine load C 2 are evaluated regularly over time and determine the selection of sounds from the sound library. In the case of sounds in sequences cut into blocks, in a simplified version, a block among all the blocks stored in the read-only memory is selected.
  • a weighted combination of blocks is used for the restitution.
  • the sound library is physically limited and all the operating conditions of the reference vehicle could not be recorded. It is therefore necessary to use sounds corresponding to parameters close to the theoretical value which must be restored to produce sounds corresponding to current operation.
  • the reference vehicle goes from 800rpm / min to 9000rpm
  • the engine of the motor vehicle on which the restitution takes place goes from 500 rpm to 4000rpm / min and it is therefore necessary, from a current measurement for example equal to 3000 revolutions / min, determine a theoretical value corresponding to that of the reference vehicle.
  • the sound library includes, for example, sequences / blocks at ... 5000, 5500, 6000, 6500, 7000 ... revolutions / min.
  • a weighted combination of the sequences / blocks is then carried out at 6500 and 7000 revolutions / min.
  • an interpolation is made from the available sounds. After this step, the sounds are always at a reference frequency F 0 and it is necessary to perform a frequency offset to correspond to the current operating mode.
  • the data is sent to the digital-analog converter 8, the analog signals thus reconstituted being amplified and filtered by the amplifier 9 which includes a filter and sent to an acoustic reproduction means 10 of the loudspeaker type.
  • the resolution of the converters can be chosen between 8 and 24 bits. Preferably 16 bits are used.
  • the acquisition frequency is preferably 44100Hz. However, it is envisaged that the frequency of acquisition and restitution is lower and, for example, up to 8,000 Hz also depending on the level of quality required, the computing power and / or the memory capacity. Likewise, a stereophonic device or not is envisaged.
  • a standby device depending on the engine speed R allows the restitution device to be switched off when the engine of the vehicle in which the device is installed is stopped.
  • the restitution device is de-energized so that the electrical consumption of the system used is almost zero, that is to say reduced to the consumption of said standby device.
  • a perfectly explicit electronic diagram alone is given in Figure 2 with a circuit integrated low-consumption CMOS of the stable mono flip-flop type, an input of which is connected to a clipping amplifier receiving a filtered signal (R1C1) corresponding to the motor rotation frequency. At each pulse of this signal the flip-flop is reset to zero. In the absence of reset, after a time defined by the components R6C3, a switchover occurs and the relay K1 is switched, which cuts the power supply to the playback device.
  • the amplifier 9 can be omitted, the output of the digital-analog converter being connected to an existing sound device of the motor vehicle and for example to a car radio.
  • the measurement of the load C of the engine 2 can be omitted, only the speed R of the engine 1 being measured or vice versa.
  • FIG. 3 represents a general functional diagram of the process of the invention which, for reasons of simplification, considers only a single sound source depending on a single parameter, the engine speed R. It is understood that the process which is there shown can be extended to any number of source types and parameters.
  • R is the engine speed
  • S the sound source
  • B 1 ... B n are n sound blocks (sounds digitized and transposed to the reference frequency F 0 )
  • E 1 ... E n are the n sound samples corresponding to the blocks
  • C 1 ... C n are n weighting coefficients.
  • the configuration table 11 corresponds to the set of weighting coefficients of the blocks of the sequences.
  • a set of n weighting coefficients of the n blocks is calculated.
  • the values of the weighting coefficients will be referenced as a function of the corresponding values of R.
  • n selected blocks of unit duration Te we obtain by weighting and addition the equivalent of a single block of duration Te.
  • a frequency shift (transposition) is then operated, calculated according to the operating state of the motor. If the operating state of the motor requires a sound reproduction of a fundamental frequency greater than Fo, the previously obtained sound sequence is decimated, in the opposite case, it is interpolated.
  • each box of the table has a (or a range of) frequency and its associated coefficient in percentage (except in the case where another box allows deduct the value as for block 1 x min frequency where we deduct 100% for any frequency less than 1000Hz.
  • combinations of blocks may be more complex than in this example.
  • the sampling is done in a manner compatible with that used for the creation of the configuration table, which is identical: the same sampling frequency Fe is used during creation and during restitution / simulation.
  • the restitution is preferably carried out by using a temporary storage memory area (buffer or "buffer") of the first in, first out type and / or by using a double buffer system so that the calculations can be done during the sound reproduction by the digital to analog converter 10 without the latter having to wait data and therefore without risk of interruption of the restitution.
  • a temporary storage memory area buffer or "buffer”

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  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP03292384A 2002-09-26 2003-09-26 Verfahren und Vorrichtung zur Erzeugung und zum Gebrauch einer Klangbibliothek um die akustische eigenschaften eines Wagensmotors darzustellen Withdrawn EP1403850A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0211939 2002-09-26
FR0211939A FR2845195B1 (fr) 2002-09-26 2002-09-26 Procede d'elaboration et de restitution d'une sonotheque representant des caracteristiques acoustiques de vehicule automobile, dispositif pour mise en oeuvre

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EP1403850A1 true EP1403850A1 (de) 2004-03-31

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EP03292384A Withdrawn EP1403850A1 (de) 2002-09-26 2003-09-26 Verfahren und Vorrichtung zur Erzeugung und zum Gebrauch einer Klangbibliothek um die akustische eigenschaften eines Wagensmotors darzustellen

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EP (1) EP1403850A1 (de)
FR (1) FR2845195B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006086832A1 (en) * 2005-02-18 2006-08-24 Tim Driessen A method and apparatus for adapting a vehicle
FR2924260A1 (fr) * 2007-11-26 2009-05-29 Peugeot Citroen Automobiles Sa Dispositif de coloration en temps reel du bruit d'un moteur de vehicule
WO2022150746A1 (en) * 2021-01-11 2022-07-14 Neapco Intellectual Property Holdings, Llc System and method for optimizing signal processing and storage using frequency-time domain conversion

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2946786B1 (fr) 2009-06-16 2011-06-24 Peugeot Citroen Automobiles Sa Procede de synthese d'une ambiance sonore au niveau d'un vehicule
US9540015B2 (en) 2015-05-04 2017-01-10 At&T Intellectual Property I, L.P. Methods and apparatus to alter a vehicle operation
US10974729B2 (en) 2018-08-21 2021-04-13 At&T Intellectual Property I, L.P. Application and portability of vehicle functionality profiles

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754094A (en) * 1994-11-14 1998-05-19 Frushour; Robert H. Sound generating apparatus
DE19726271A1 (de) * 1997-06-20 1998-12-24 Forsch Kfz Wesen U Fahrzeugmot Verfahren und Vorrichtung zur Nachbildung von Maschinengeräuschen
GB2354872A (en) * 1999-07-30 2001-04-04 Video Tech Designs Plc Noise simulator
WO2001033543A1 (fr) * 1999-11-02 2001-05-10 Laurent Clairon Procedes d'elaboration et d'utilisation d'une sonotheque representant les caracteristiques acoustiques de moteur de vehicule automobile, dispositifs pour mise en oeuvre
US6356185B1 (en) * 1999-10-27 2002-03-12 Jay Sterling Plugge Classic automobile sound processor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754094A (en) * 1994-11-14 1998-05-19 Frushour; Robert H. Sound generating apparatus
DE19726271A1 (de) * 1997-06-20 1998-12-24 Forsch Kfz Wesen U Fahrzeugmot Verfahren und Vorrichtung zur Nachbildung von Maschinengeräuschen
GB2354872A (en) * 1999-07-30 2001-04-04 Video Tech Designs Plc Noise simulator
US6356185B1 (en) * 1999-10-27 2002-03-12 Jay Sterling Plugge Classic automobile sound processor
WO2001033543A1 (fr) * 1999-11-02 2001-05-10 Laurent Clairon Procedes d'elaboration et d'utilisation d'une sonotheque representant les caracteristiques acoustiques de moteur de vehicule automobile, dispositifs pour mise en oeuvre

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006086832A1 (en) * 2005-02-18 2006-08-24 Tim Driessen A method and apparatus for adapting a vehicle
FR2924260A1 (fr) * 2007-11-26 2009-05-29 Peugeot Citroen Automobiles Sa Dispositif de coloration en temps reel du bruit d'un moteur de vehicule
WO2022150746A1 (en) * 2021-01-11 2022-07-14 Neapco Intellectual Property Holdings, Llc System and method for optimizing signal processing and storage using frequency-time domain conversion

Also Published As

Publication number Publication date
FR2845195A1 (fr) 2004-04-02
FR2845195B1 (fr) 2005-01-21

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