EP2145504A2 - Aktivakustikgehäuse mit lautsprecher mit mehreren verteilten wandlern - Google Patents

Aktivakustikgehäuse mit lautsprecher mit mehreren verteilten wandlern

Info

Publication number
EP2145504A2
EP2145504A2 EP08787891A EP08787891A EP2145504A2 EP 2145504 A2 EP2145504 A2 EP 2145504A2 EP 08787891 A EP08787891 A EP 08787891A EP 08787891 A EP08787891 A EP 08787891A EP 2145504 A2 EP2145504 A2 EP 2145504A2
Authority
EP
European Patent Office
Prior art keywords
transducers
signal
power stages
loudspeaker
amplifier
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
Application number
EP08787891A
Other languages
English (en)
French (fr)
Other versions
EP2145504B1 (de
Inventor
Christophe BARBÉ
Jean Etcheparre
Frédéric CHANAL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Parrot SA
Original Assignee
Parrot SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Parrot SA filed Critical Parrot SA
Publication of EP2145504A2 publication Critical patent/EP2145504A2/de
Application granted granted Critical
Publication of EP2145504B1 publication Critical patent/EP2145504B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion

Definitions

  • the invention relates to an acoustic loudspeaker using a "distributed mode" type loudspeaker.
  • a diaphragm In a conventional loudspeaker, a diaphragm, generally of conical shape, is driven in a coherent pistonic movement, that is to say a movement of which, ideally, the amplitude and the phase of the displacement are constant over the entire extent of the diaphragm.
  • DML distributed mode-type loudspeaker
  • the diaphragm which is usually flat, is vibrated according to a complex diagram where the amplitude and phase of the different points of the diaphragm are ideally distributed in a completely decorrelated manner, ie the diaphragm appears to be vibrating randomly over the extent of its surface, contrary to the coherent vibration of the membrane in a high position. conventional speaker.
  • At least one transducer placed at a precise location on the radiant panel is used, determined according to the mechanical characteristics of the panel (its mass, its acoustic damping coefficient, its structural rigidity) as well as its geometry, in order to distribute the vibration mode over the entire surface of the latter in a manner so complex that it can be considered as random.
  • the use of a capacitor of high capacity, electrolytic is likely to introduce non-linearities in the response of the filter.
  • the resistor must be sufficiently sized to dissipate the energy passing through the RC branch instead of crossing the associated transducer, with moreover an unnecessary loss of energy, which has repercussions on the dimensioning of the exciting amplifier stage. the transducers.
  • a passive RC filter does not allow a fine adaptation of the response, so that the efficiency of the speaker, and the linearity of its response, will always be essentially conditioned by the geometry of the panel and the choice of the location. transducers on it.
  • An acoustic loudspeaker using a distributed mode loudspeaker is for example described in WO 97/09840 A or US 2006/023898 A1. But in these documents the radiant panel is excited by a single transducer, so that the problem of the power distribution between two transducers does not arise. These documents certainly show configurations with two transducers, but they excite separate radiant panels, for example for the right and left channels. In addition, the power distribution by the amplifiers and the associated filters is between HP and HP HP distributed mode and not, as in the situation envisaged by the present invention, between the two transducers of the same HP mode distributed.
  • One of the aims of the invention is to propose a new configuration of acoustic enclosure to overcome the various disadvantages described above, with the following advantages:
  • the invention is based on the idea of electrically decoupling the transducers, and independently controlling each of them by separate channels of one or more digital audio amplifiers.
  • Digital filtering performed upstream that is to say before power amplification, will allow a better distribution of the modes of vibration over the entire sound spectrum, and will avoid losses in the inevitable resistances and non-linearities. with the prior art, where the transducers were coupled together by a passive filtering stage.
  • the active acoustic loudspeaker of the invention is of the type comprising a distributed mode loudspeaker, with an excited non-pistonic radiant panel with random distribution of the amplitude and the phase by at least two electro-acoustic transducers placed with predetermined non-symmetrical manner on the radiant panel.
  • Amplifier means receive an input signal to be reproduced and are coupled at output to said transducers, and filtering means distribute between the at least two transducers, according to a respective predetermined frequency characteristic, the signal to be reproduced delivered by the amplifying means.
  • the amplifying means comprise a plurality of distinct power stages, each of which is directly connected at the output to a respective transducer, and the filtering means are digital filtering means arranged upstream of the power stages, to apply said respective frequency characteristic predetermined to the signal to be reproduced before transmission of the latter to each of the respective power stages.
  • the power stages are D-class switching stages 1 notably comprising half-bridge stages with configurable configuration;
  • the loudspeaker also comprises a bass channel, with a clean amplifier stage and a clean loudspeaker, and a channel splitter stage for distributing, in particular via a common type I 2 S bus, respective fractions of the signal spectrum. to reproduce between, on the one hand, the digital filtering means and, on the other hand, the own amplifier stage of the bass channel.
  • FIG. 1 is a general block diagram of a two-transducer distributed mode loudspeaker, with its associated amplification and filtering circuits, according to the prior art.
  • FIG. 2 schematically illustrates the various members of an active acoustic enclosure according to the invention.
  • FIG. 1 diagrammatically shows a distributed mode loudspeaker and its associated circuits, according to a configuration of the prior art.
  • the distributed mode loudspeaker 10 comprises a radiant panel 12, typically a rectangular flat panel, excited by two identical transducers 14, 16 precisely placed on the panel, in a non-symmetrical configuration: the first transducer 14 is placed closer to the center of the panel, while the second transducer 16 is disposed in a peripheral region of the panel further away from the center.
  • the transducers are powered by an amplifier 18 receiving as input an audio signal 20, preferably a digital audio signal (PCM signal).
  • the amplifier 18 comprises a first filtering stage 22 ensuring an equalization of the signal as a function of the overall response curve of the loudspeaker 10.
  • the signal is then applied to a power amplification stage 24, for example a stage d Class D digital amplification 24, ie a stage operating essentially in commutation, on the principle of pulse width modulation (PWM).
  • the stage 24 typically comprises a MOS switch bridge controlled by a PCM ⁇ PWM conversion stage 26.
  • the signal collected at the output of the bridge is applied to a low-pass filter 28 for the elimination of unwanted frequencies, in particular the switching frequency of the digital amplifier stage 24, as well as its harmonics.
  • the signal at the output of the amplifier 18 is applied to the transducers 14 and 16 via a passive stage 30 of mutual coupling of the transducers and filtering.
  • the two transducers 14, 16 are connected in series, with a passive filter 32 in parallel on the transducer 16 furthest from the center of the panel.
  • the filter 32 is a series RC filter, with an electrolytic capacitor 34 and a calibrated resistor 36, so as to be able to dissipate a portion of the energy produced in the upper spectrum instead of applying it to the transducer 16.
  • the filtering thus introduced provides a better distribution of the vibration modes of the panel throughout the spectrum: for the lowest frequencies, the two transducers are excited concurrently at full power, while for the highest frequencies it is the transducer 14 , closest to the center, which delivers to the panel most of the mechanical energy.
  • FIG. 2 schematically illustrates an enclosure with a distributed mode loudspeaker and its associated circuits, in a configuration according to the teachings of the invention.
  • This enclosure 40 comprises a distributed mode loudspeaker 10 of the same type as that of FIG. 1, that is to say with a radiant panel 12 excited by two (or more) transducers 14 and 16 placed in a manner. very precise, and not symmetrical, on this panel.
  • the speaker 40 also includes a subwoofer 42, which may be of a conventional piston type, for reproducing the lowest frequencies ⁇ subwoofer).
  • the separation of the channels to the two loudspeakers 10 and 42 is effected by a digital circuit 44 receiving the input signal to be reproduced (PCM digital signal), after overall equalization, at 22.
  • the separation is typically done at a crossover frequency or crossover of 200 Hz.
  • the outputs of the circuit 44 are respectively applied to an amplifier 48 intended to supply the distributed-mode loudspeaker 10 (frequencies greater than 200 Hz) and an amplifier 50 intended to feed the top low-range 42 (frequencies below 200 Hz).
  • the stages 22 and 44 are advantageously implemented within the same digital circuit 46, for example a component of the P5 or P5 + type designed and marketed by Parrot SA.
  • These components incorporate a digital signal processor to perform a complete acoustic processing, and have all the usual analog and digital communication interfaces.
  • the output is advantageously on a universal bus type I 2 S.
  • I 2 S universal bus type
  • the amplifier 48 comprises a plurality of class D power stages which, in the example illustrated, are half-bridge stages 52, 54 which can be coupled two by two directly to the terminals of the transducer. respective 14 or 16.
  • this coupling has two differences: on the one hand the transducers 14, 16 are not coupled together (whereas they were connected in series in the case of FIG. 1), and on the other hand the coupling is a direct coupling between the class D output stage and the transducer, without the interposition of passive component.
  • the amplifier stages 52, 54 are controlled by respective PCM ⁇ PWM conversion circuits 56, themselves controlled by a stage 58 of "Channel Mapping" for associating the I 2 S inputs with the respective amplification channels.
  • the power amplifier 48 is advantageously embodied in the form of a single integrated component, for example of the STA335BW type sold by STMicroelectronics, which has the advantage that it can indeed be used according to several different configurations (two identical stereo channels, three type 2.1 channels, single channel at maximum power, ...) by a simple logical parameterization.
  • This property is advantageously used by distributing a single input (the signal to be reproduced by the loudspeaker 10) on two parallel channels CH 1 and CH 2 to which separate filtering and distinct amplifications are applied, to separately excite each of the two transducers 14, 16.
  • the filtering may be carried out in particular by "biquad" type cells 60, 62, 64, 66.
  • this amplifier may also consist of a component of the same nature as the amplifier 48, but in which the half-bridges are configured between them in two bridges connected in parallel, delivering all the power available on a single output channel, namely the bass speaker 42.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP08787891.4A 2007-04-12 2008-04-02 Lautsprechergehäuse mit aktivem biegewellenwandler Not-in-force EP2145504B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0702660A FR2915051B1 (fr) 2007-04-12 2007-04-12 Enceinte acoustique active avec haut-parleur a mode distribue
PCT/FR2008/000452 WO2008139047A2 (fr) 2007-04-12 2008-04-02 Enceinte acoustique active avec haut-parleur a mode distribue multi-transducteur

Publications (2)

Publication Number Publication Date
EP2145504A2 true EP2145504A2 (de) 2010-01-20
EP2145504B1 EP2145504B1 (de) 2014-05-07

Family

ID=38774560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08787891.4A Not-in-force EP2145504B1 (de) 2007-04-12 2008-04-02 Lautsprechergehäuse mit aktivem biegewellenwandler

Country Status (3)

Country Link
EP (1) EP2145504B1 (de)
FR (1) FR2915051B1 (de)
WO (1) WO2008139047A2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2980070B1 (fr) 2011-09-13 2013-11-15 Parrot Procede de renforcement des frequences graves dans un signal audio numerique.
FR2995752B1 (fr) 2012-09-18 2015-06-05 Parrot Enceinte acoustique active monobloc configurable pour etre utilisee isolement ou par paire, avec renforcement de l'image stereo.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10154915B4 (de) * 2001-11-08 2005-02-03 Harman/Becker Automotive Systems Gmbh (Harman Division) Flachlautsprecheranordnung
US20060023898A1 (en) * 2002-06-24 2006-02-02 Shelley Katz Apparatus and method for producing sound

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008139047A3 *

Also Published As

Publication number Publication date
EP2145504B1 (de) 2014-05-07
WO2008139047A2 (fr) 2008-11-20
FR2915051A1 (fr) 2008-10-17
WO2008139047A3 (fr) 2009-02-19
FR2915051B1 (fr) 2009-07-10

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