EP0164343A1 - Transmetteur sonore electro-acoustique - Google Patents

Transmetteur sonore electro-acoustique

Info

Publication number
EP0164343A1
EP0164343A1 EP19840900312 EP84900312A EP0164343A1 EP 0164343 A1 EP0164343 A1 EP 0164343A1 EP 19840900312 EP19840900312 EP 19840900312 EP 84900312 A EP84900312 A EP 84900312A EP 0164343 A1 EP0164343 A1 EP 0164343A1
Authority
EP
European Patent Office
Prior art keywords
amplifier
resonator
frequency
sound transmitting
transmitting device
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.)
Withdrawn
Application number
EP19840900312
Other languages
German (de)
English (en)
Inventor
Mendel Kleiner
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0164343A1 publication Critical patent/EP0164343A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
    • 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
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits

Definitions

  • the present invention relates to an electroacoustic sound trans ⁇ mitter for the generation of high-intensity sound .
  • the transmitter according to the invention is of the type comprising an open reso ⁇ nance unit (resonator) , an electroacoustic transducer and an amp ⁇ lifier.
  • Electroacoustic sound transmitters using for example horns are well known . If one in order to obtain a high efficiency wishes to utilize the natural resonance at the acoustic system the electric portion must be driven with the resonator frequency of the acoustic system . In practice, however, this causes great difficulties due to the resonance frequency will change under such conditions like temperature and pressure. This -means that a sound transmitter of this type, driven by means of a fixed frequency, will receive varied
  • the problem to be solved by this invention is to achieve a sound transmitter with mainly unchanged sound level and with high efficiency without regards of changes in temperature and other con ⁇ ditions .
  • Fig. 1 is a schematic illustration of the mechanical input impedance of the resonance unit.
  • Fig. 2 is a schematic illustration of the electrical input impedance of the transducer- resonance devices according to figure 5.
  • Fig. 3 shows the principle for the connection between the amp ⁇ lifier oscillator and transducer-resonance devices .
  • Fig. 4 shows an example of an intended practical embodiment.
  • Fig. 5 shows an electroacoustic transducer of electrodynamic type with a resonance unit partly shown.
  • Fig. 6 shows an analogue circuit for the transducer as shown in figure 5.
  • a typical form of embodiment of the invention is shown in fi ⁇ gure 4.
  • a horn 1 is shown with an open end 6 and an electromechanical transducer 2, which is coupled to the other open end of the horn 1 opposite to the open end 6.
  • the electromechanical, or as it may also be called electroacoustic transducer 2 is driven from an amplifier not shown, coupled like an oscillator, producing the drive frequency.
  • the electroacoustic transducer is shown more closely in figure 5.
  • Numeral 8 signifies the throat opening of the horn 1 at the said second to the transducer 2 adjacent portion of the horn.
  • the throat opening 8 is connected in a direct attachment to a diaphragm 3, which is connected to a voice coil 5, which is located in an air gap 4 of a circular permanent magnet system 7.
  • the electromechanical trans ⁇ ducer is consequently designed according to the principles of an electrodynamic loudspeaker, in which the coil is usually called the voice coil. Also other principles can be utilized for example the use of a piezo- electric crystal.
  • the drive voltage from the amplifier mentioned is applied to the coil 4, which concurrently with the voltage changes by means of its alternating magnetic field, will cause vibrations the diaphragm 3 the frequency of which mainly corresponds to the frequency of the amplifier output voltage.
  • the movements of the diaphragm 3 will in
  • An open acoustic resonator like for example a tube or a horn has an impedance characteristic which can be schematically illu ⁇ strated as in figure 1.
  • the smaller the transmitter mouth is compared to the wave length of the sound the more resonant the impedance function becomes .
  • Zp electrical impedance of the transducer with the voice coil 5 im ⁇ mobile and where BL is a product of magnetic flux density and where length L of the voice coil 5 in the air gap 4 of the transducer
  • the mechanical circuit of the suggested transducer can be drawn schematically for low frequencies as in figure 6.
  • Z M is the mechanical impedance which the force from the transducer acts on .
  • Z M is influenced by the impedance of the horn or the tube as shown in figure 1. At resonance the resulting velocity v for the applied force F is determined by
  • the operating principle of the amplifier/oscillator is as follows .
  • Negative current feedback from point A of the amplifier/oscillator tries to keep the output voltage constant at point A regardless of the voltage at point B , the output terminal of the amplifier.
  • the load Z- consists of a parallell-resonance circuit and a circuit with an analogous behaviour, for example a loudspeaker
  • the voltage at point B will be high at resonance if the paraUell resonance circuit has a high value of .
  • the positive voltage-feedback from point B now strives to maximize the voltage at point B .
  • With a suitable amount of feedback the circuit will oscillate at a frequency corre ⁇ sponding to the resonance frequency of the load impedance Z. . If the load Z.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

Dispositif de transmission sonore pour la production efficace de sons intenses, comportant un dispositif résonateur (1), un transducteur électro-acoustique (2) avec un élément d'attaque (5) et un amplificateur couplé en tant qu'oscillateur. L'amplificateur couplé en tant qu'oscillateur est doté d'une solution de circuit permettant l'ajustement de la fréquence du courant d'attaque à la position présente de la fréquence du résonateur dans le dispositif résonateur (1). Ceci est effectué grâce à une réaction d'intensité électrique négative et à une réaction d'intensité positive de la tension à la sortie de l'amplificateur, qui dépend instantanément de l'influence mécanique de l'élément d'attaque (5) des vibrations de la colonne d'air dans le dispositif résonateur. Grâce à cela, la fréquence de l'oscillateur est ajustée à la position présente de la fréquence du résonateur dans le dispositif résonateur.
EP19840900312 1983-12-09 1983-12-09 Transmetteur sonore electro-acoustique Withdrawn EP0164343A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE1983/000442 WO1985002747A1 (fr) 1983-12-09 1983-12-09 Transmetteur sonore electro-acoustique

Publications (1)

Publication Number Publication Date
EP0164343A1 true EP0164343A1 (fr) 1985-12-18

Family

ID=20349797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840900312 Withdrawn EP0164343A1 (fr) 1983-12-09 1983-12-09 Transmetteur sonore electro-acoustique

Country Status (2)

Country Link
EP (1) EP0164343A1 (fr)
WO (1) WO1985002747A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE68921922T2 (de) * 1988-05-31 1995-12-07 Yamaha Corp Temperaturkompensationsschaltung in einem Verstärker zum Treiben einer negativen Impedanz.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2235664A1 (de) * 1972-07-20 1974-01-31 Max Planck Gesellschaft Schaltungsanordnung zur kompensation des spannungsabfalls an einem lautsprecher
DE2420689C3 (de) * 1974-04-29 1984-09-20 Arndt 7500 Karlsruhe Klingelnberg Verfahren und Anordnung zur Verbesserung der Eigenschaften elektrodynamischer Wandler durch Bewegungsgegenkopplung
FR2306589A1 (fr) * 1975-03-21 1976-10-29 Lassale Jean Claude Asservissement de convertisseurs electro-acoustiques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8502747A1 *

Also Published As

Publication number Publication date
WO1985002747A1 (fr) 1985-06-20

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