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
  • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R29/00—Monitoring arrangements; Testing arrangements
  • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers

Definitions

• the invention relates to a method for the design and manufacture of loudspeakers for particular in automotive interiors used public address systems.
• a model of the loudspeaker is usually first created as part of a measurement, taking into account its linear and, to some extent, its non-linear transmission properties. Subsequently, the current and voltage of the loudspeaker in operation are evaluated, compared with this model and then influenced accordingly.
• the relevant parameters of a loudspeaker or a loudspeaker chassis are usually qualified in the open air, ie in the non-installed state. This is unproblematic in the case of small diaphragm deflections, since the spring stiffness, usually assumed to be linear, of the air mass enclosed in the interior of the loudspeaker housing also influences the loudspeaker parameters only linearly.
• manufacturing parameter tolerances can lead to strong deviations of the speaker characteristics with each other, which ultimately the above-described electronic optimization can be used only within narrow limits and - in certain circumstances - even lead to a deterioration of the performance of the speakers.
• the present invention seeks to provide a method for the design and manufacture of loudspeakers for particular used in automotive interiors public address systems available by means of which the design optimization of such speakers and the electronic compensation of the same are coordinated can be that both reduces the cost of the production of such speakers and the speakers produced by the method can be created with technically more sophisticated properties at the same time.
• This object is achieved by a method for the design and manufacture of loudspeakers for particular used in the automotive interior public address systems, in the mechanical, electrical and acoustic targets be specified for the specification of the speaker to be produced, in which for electronic optimization of the speaker to be produced parameters for linearization of the speaker dynamics are given in which, taking into account the targets for the specification of the speaker and the parameters specified for linearization of the speaker dynamics electromechanical requirements for the produced Loudspeakers are determined, and compared with the electrical input variables of the loudspeaker with associated acoustic output variables and determined in this comparison deviations are compensated by means of electronic optimization, adjusting the parameters specified for the linearization of the speaker dynamics.
• the design optimization of the speaker or the speaker chassis and the electronic optimization of the speaker to determine linear and nonlinear parameters of speaker dynamics and electronic compensation of non-linear components on the one hand with the optimization of constructive details of the speaker or the speaker chassis connected on the other side.
• maximum permissible values for the membrane surface, the membrane stroke, the installation volume and the weight are specified as mechanical targets for the specification of the loudspeaker to be produced.
• the maximum available impedance as electrical target specifications for the specification of the loudspeaker to be produced Power and the voice coil inductance specified.
• the resonant frequency in the installed state, the maximum sound pressure and the maximum permissible distortions can be specified in the said method as acoustic targets for the specification of the loudspeaker to be produced.
• the mechanical, electrical and acoustic targets for the specification of the loudspeaker to be produced and the parameters predetermined for the linearization of the loudspeaker dynamics for the electronic optimization of the loudspeaker to be produced can be iteratively coordinated with one another.
• a database is expediently used in determining the setpoint values, in which data regarding electrical, mechanical, acoustic and economic parameters of individual constructive elements and components of the loudspeaker are stored.
• a mathematical Mödell of the loudspeaker are used, for comparison with internal model sizes Relevant variables are determined directly or indirectly, eg through a real-time evaluation of current and voltage at the voice coil.
• a data set of design details such as force factor, stiffness of the diaphragm suspension, voice coil inductance, friction and maximum diaphragm stroke is taken into account.
• a record can be generated at the end of the manufacturing process by means of a measurement.
• a further considerable simplification for the method according to the invention can be achieved if the data record is stored in a memory component arranged in or on the loudspeaker or loudspeaker chassis and the data record stored in the memory component is read out by a readout module and this data record is read by the readout module to an optimization module the electronic optimization is forwarded.
• the method according to the invention for the design and manufacture of loudspeakers can also be used for the design of smartphone and / or headphone loudspeakers.
• the optimization module may include software for electronic optimization from a third location, e.g. an app store, download and save.
• the record of the loudspeaker can be retrieved from a database in the inventive method and installed on the memory component.
• loudspeakers or loudspeaker chassis can be manufactured with a considerably lower economic and technical complexity compared to the prior art.
• the speaker or loudspeaker chassis produced can have a significantly reduced weight, as on the constructive side targeted cuts can be accepted, however, which can be compensated by taking place in the operation of the speaker or speaker chassis electronic optimization. Accordingly, with the same size of speaker or loudspeaker chassis less distortion at the same maximum volume and lower economic outlay, equal distortions at higher maximum volume and lower economic outlay and equal distortions at the same maximum volume and lower economic cost can be achieved.
• the entire production process including the design, the construction, the production up to the application of the loudspeaker or loudspeaker chassis, is optimized in such a way that the economic outlay and the weight are reduced and further factors described above are optimized.
• this parameter set contains statements about the performance of the underlying algorithm for the linearization of loudspeaker dynamics, eg the maximum possible extension of the linear usable diaphragm lift, the maximum possible sound pressure increase by increasing the diaphragm stroke, the maximum possible distortion reduction with constant diaphragm stroke, the maximum increase of the voice coil current with full excitation of the extended linear useful range etc.
• iterative method steps can be performed in order to coordinate the aspects of the target specification and the parameter specification of the electronic optimization.
• electromechanical requirements are determined for the loudspeaker to be produced or for the loudspeaker chassis to be produced, e.g. the required magnetic air strength in the air gap, the required dimensions of the air gap, such as length, width, diameter, etc., the required voice coil diameter, the required voice coil wire cross-section, the required dimensioning of ventilation openings, etc.
• optimally suitable design details of the components or the voice coil are selected, taking account of economic aspects and / or other specifications, with which the loudspeaker or loudspeaker chassis is subsequently produced.
• this structural compromises can be taken into account, which also have a weight-reducing production result in a reduction of the economic effort and whose electro-acoustic effects on the manufactured speaker or loudspeaker chassis produced by the occurring in later operation electronic optimization are compensated again ,
• this data set can be done within the manufacturing process or at the end of the same in the form of a measurement or simplifying without a measurement directly from the sum of the known effects of the selected design details are derived.
• the readout module can be designed, for example, as an independent hardware module or as a software module, which in turn can be embedded in a hardware platform or in a software framework.
• the reading itself can both wired, for example via a digital bus, as well as wireless, for example by means of RFID technology.
• the read-out module transmits the corresponding data to the module containing the electronic optimization, so that it can be integrated directly as a mathematical model and the electronic optimization can be carried out, e.g. as part of the application in an automobile.
• the readout module as well as the optimization module serving for electronic optimization can be embodied both within one and the same hardware component as well as in different or separate hardware components.
• the two modules may e.g. be implemented in a central amplifier of a public address system used in an automobile both in close proximity to a loudspeaker and speaker chassis and further away from it.
• both may be e.g. be implemented on different, separate components, which may be part of a bus-based, distributed public address system, for example.
• the inventive method for the design and manufacture of speakers for smartphones and / or headphones can be used.
• the readout module may be part of the smartphone or a headphone amplifier here, while the optimization module may also be implemented as a module within the smartphone or the headphone amplifier.
• the optimization module essentially contains software for electronic optimization, wherein these Software as an application (app) from a third party, eg from an App Store, downloadable and installable and executable on the respective platform.
• the speaker-side data set can also be downloaded from a database and installed on the memory component.

Landscapes

• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Acoustics & Sound (AREA)
• Signal Processing (AREA)
• Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
• Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

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Citations (4)

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• 2017
  • 2017-10-27 DE DE102017010048.9A patent/DE102017010048A1/de active Pending
• 2018
  • 2018-08-10 EP EP18000669.4A patent/EP3477967A1/de not_active Ceased
  • 2018-10-16 CN CN201811200999.9A patent/CN109729482B/zh active Active

Patent Citations (4)

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