US3246721A - Frequency response of an electroacoustic transducer - Google Patents

Frequency response of an electroacoustic transducer Download PDF

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Publication number
US3246721A
US3246721A US275808A US27580863A US3246721A US 3246721 A US3246721 A US 3246721A US 275808 A US275808 A US 275808A US 27580863 A US27580863 A US 27580863A US 3246721 A US3246721 A US 3246721A
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US
United States
Prior art keywords
space
membrane
partition wall
resonator
frequency response
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Expired - Lifetime
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US275808A
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English (en)
Inventor
Martin Erwin
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.)
Siemens and Halske AG
Siemens AG
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Siemens AG
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Publication date
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    • 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 
    • H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for telephonic receivers

Definitions

  • the invention disclosed herein is concerned with an arrangement for improving the frequency response of an electro-acoustic transducer.
  • the transducer according to the invention comprises a housing which is, with the aid of a membrane and a partition wall, which wall is provided with at least one break-through, subdivided to'form a space respectively in front and in back of the membrane and also a resonator space.
  • the present invention introduces, for an electro-acoustic transducer of the initially indicated kind, a particularly advantageous arrangement for an auxiliary resonator space.
  • This arrangement permits with simple measures a coupling to the frontal space of the membrane as well It is also possible to effect simultaneous coupling to the two indicated spaces, thereby producing a particularly favorable action with respect to the frequency response.
  • the characteristic feature of the invention resides in the provision of a further cylindrical partition wall, be-
  • FIG. 1 shows the principles applied in an arrangement according to the invention, with the auxiliary resonator space provided with an opening to the frontal space of the membrane;
  • FIG. 2 represents the electrical analog or equivalence circuit for the arrangement according to FIG. 1;
  • FIG. 3 indicates a constructive realization in connection with an electromagnetic transducer
  • FIGS. 4 and 6 illustrate examples of the arrangement according to the invention, wherein openings are provided leading from the auxiliary resonator space to the original resonator space which is coupled to the rearward space of the membrane, and with openings to the latter resonator space and the frontal space of the membrane;
  • FIGS. 5 and 7 represent electrical analog or equivalence circuits respectively for the embodiments illustrated in FIGS. 4 and 6.
  • FIGS. 1, 3, 4 and 6 show the spatial arrangement of parts and FIGS. 2, 5 and 7 show electrical equivalence circuits drawn in accordance with the force-voltage analogy.
  • FIG. 1 shows an electro-acoustic transducer having a housing G which is disposed within the chamber HA of a telephone hand set.
  • the transducer housing G is by the membrane M and the partition wall T1, which ture principle. shown (in FIG. 3) so as to give a practical example for the applicability of the arrangement illustrated in is provided with a break-through L1, subdivided to form the frontal space C4 and the rearward space C2 of the membrane, and also the resonator space C1.
  • the breakthrough L1 in the partition wall T1 is closed by an acoustic resistor R1.
  • the sound passage openings of the transducer housing are contiguous to the sound passage channels L3, R3 which extend to the outside. It is in the present case assumed that the electro-acoustic transducer is also used as a receiver. There is therefore indicated an aural volume C3.
  • an auxiliary resonance space C5 which is sealed with respect to the rearward space of the membrane. This auxiliary resonance space C5 is in this embodiment connected with the frontal space of the membrane over the annular acoustically operative channel L6, R6.
  • FIG. 2 represents the electrical analog or equivalence circuit corresponding to the acoustic conditions of FIG. 1.
  • the capacitances correspond to the reciprocal stilfnesses of the respective volumes and the inductances and resistances correspond respectively to the masses and the acoustic resistances of the respective openings.
  • the elements indicated by the sign refer to the membrane.
  • the capacitance of the capacitor C5 will likewise be relatively high. It acts in a manner similar to a shunt, so that the series circuit of the inductance L6 and the resistance R'6 lies parallel to the capacitance C4, making it possible, with appropriate dimensioning of the inductivity and the resistance, that is, with appropriate dimensioning of the acoustically active opening at the rim of the membrane, to effect a raising in the lower part of the frequency band.
  • a resonator which is tuned to a frequency in the central or upper part of the transmission range.
  • This resonator acts in such case as an absorption resonator and can be used for the attenuation of a resonance peak in the frequency response of the transducer.
  • the arrangement of the auxliary resonator space is particularly important in connection with electromagnetic transducers operating in accordance with the ring arma- Such a transducer is therefore likewise FIG. 1.
  • the annular support A for the ring shaped armature RA is dimensioned and arranged so as to leave an intermediate space between the permanent magnet D and the support A, such space being utilized as auxiliary resonator space C5.
  • the acoustically effective connection with the frontal space of the membrane is established by one or more cutouts L6, R6, formed at the outer rim of the membrane.
  • the openings referred to represented by the inductances L6 and L'7, as well as the resistances R6 and R7, and the volume of the auxiliary resonator space, represented by the capacitance (3'5) are shownin prominent lines.
  • the analog circuit represents an approximation for cases in which (3'1 is considerably greater than C4 and wherein the two openings in the auxiliary resonator have about the same cross-sectional area.
  • the measure indicated in FIG. 6 will not only permit tuning at low frequencies and therewith raising the frequency course in the lower part of the transmission range, but will, with appropriate dimensioning of the opening L6, R6, effect an absorption at one resonance peak in the transmission range.
  • the series resonance of the elements L'6, R6, C'S (FIG. 7) becomes effective.
  • an arrangement for improving the frequency response of the transducer comprising a further, cylindrical, partition wall disposed between the first This is substantially 4 named partition wall and the membrane, said further partition wall forming an auxiliary annular resonator space which is sealed thereby with respect to the laterally adjacent space in back of the membrane.
  • auxiliary resonance space communicates with the space in front of the membrane by way of at least one acoustically effective opening formed at the rim of the membrane.
  • auxiliary resonator space communicates with a resonator space coupled to the space in back of the membrane, by Way of at least one acoustically effective opening.
  • a housing including a front wall portion, a rear wall portion, and peripheral wall means connecting the front and rear wall portions, a membrane and a partition wall extending between the peripheral wall means and subdividing the housing interior to form a first space between said membrane and said front wall portion, and a second space between said membrane and said partition wall, the latter having an opening therein, and a further tubular partition wall extending between the first-mentioned partition wall and the membrane and cooperable therewith and with said peripheral wall means to define an annular resonator space with said tubular partition wall forming a seal between said resonator space and the laterally adjacent space between said membrane and the first-mentioned partition wall, said annular resona tor space having an opening in a wall defining the same, providing communication between such annular resonator space and an adjacent space Within said housing.
US275808A 1962-04-27 1963-04-24 Frequency response of an electroacoustic transducer Expired - Lifetime US3246721A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES79202A DE1188656B (de) 1962-04-27 1962-04-27 Anordnung zur Frequenzgangverbesserung eines elektroakustischen Wandlers

Publications (1)

Publication Number Publication Date
US3246721A true US3246721A (en) 1966-04-19

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US275808A Expired - Lifetime US3246721A (en) 1962-04-27 1963-04-24 Frequency response of an electroacoustic transducer

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US (1) US3246721A (fi)
BE (1) BE631608A (fi)
CH (1) CH399542A (fi)
DE (1) DE1188656B (fi)
FI (1) FI42731B (fi)
GB (1) GB999378A (fi)
NL (2) NL142042B (fi)
SE (1) SE318610B (fi)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3396241A (en) * 1964-10-23 1968-08-06 Russell K Anderson Stethoscope with sound spectrum selection
US3819879A (en) * 1971-12-20 1974-06-25 Ibm Electro-acoustic transducer housing adapted for telephonic pcm communication systems
US4086445A (en) * 1977-01-18 1978-04-25 Northern Telecom Limited Telephone handset transmitter with improved output response
US4637489A (en) * 1984-09-04 1987-01-20 Nippon Chem-Con Corp. Electroacoustic transducer
US4727583A (en) * 1986-10-28 1988-02-23 Motorola, Inc. Telephone transducer with improved frequency response
US4742887A (en) * 1986-02-28 1988-05-10 Sony Corporation Open-air type earphone
WO1989004106A1 (en) * 1987-10-28 1989-05-05 Acs Communications, Inc. Acoustic filter microphone cup
US4864611A (en) * 1987-11-24 1989-09-05 Helmuth Keld T Telephone handset attachment for use in-the-ear hearing aids
US4977975A (en) * 1989-09-14 1990-12-18 Lazzeroni John J Vented motorcycle helmet speaker enclosure
US20030219138A1 (en) * 2002-05-24 2003-11-27 Andi Vonlanthen Hearing device
US20070160245A1 (en) * 2006-01-10 2007-07-12 Yan-Ru Peng Personal voice-transmitted device
US20080123890A1 (en) * 2006-11-29 2008-05-29 Yan-Ru Peng Methods and apparatus for sound production
US20150139432A1 (en) * 2013-10-30 2015-05-21 SVANTEK Sp. z o.o Device for measuring sound level
US10171905B2 (en) * 2016-02-14 2019-01-01 Transound Electronics Co., Ltd. Headphones with frequency-targeted resonance chambers
US20200045402A1 (en) * 2018-08-02 2020-02-06 EVA Automation, Inc. Headphone with Multiple Acoustic Paths
US11451891B2 (en) * 2017-07-18 2022-09-20 Shure Acquisition Holdings, Inc. Moving coil microphone transducer with secondary port

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948034A1 (de) * 1979-11-29 1981-06-11 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Elektro-akustischer wandler mit zur verbesserung des frequenzverlaufes vorgesehenen resonanzraeumen

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1854716A (en) * 1929-01-24 1932-04-19 Herman G Pape Sound instrument
US2327137A (en) * 1941-05-21 1943-08-17 Sonotone Corp Hearing aid microphone
US2342334A (en) * 1942-07-11 1944-02-22 Maico Company Inc Variable baffle for translating devices
US2490466A (en) * 1944-07-19 1949-12-06 Rca Corp Loudspeaker diaphragm support comprising plural compliant members
US2524393A (en) * 1947-12-06 1950-10-03 E A Myers & Sons Noise reducing hearing aid case
US2585052A (en) * 1948-04-23 1952-02-12 Int Standard Electric Corp Granule type acoustic transducer
US2778882A (en) * 1951-01-11 1957-01-22 Lustraphone Ltd Microphones
DE1078174B (de) * 1956-02-25 1960-03-24 Dr Emil Podszus Aufhaengung fuer Lautsprechermembranen mit besonderer Daempfung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1854716A (en) * 1929-01-24 1932-04-19 Herman G Pape Sound instrument
US2327137A (en) * 1941-05-21 1943-08-17 Sonotone Corp Hearing aid microphone
US2342334A (en) * 1942-07-11 1944-02-22 Maico Company Inc Variable baffle for translating devices
US2490466A (en) * 1944-07-19 1949-12-06 Rca Corp Loudspeaker diaphragm support comprising plural compliant members
US2524393A (en) * 1947-12-06 1950-10-03 E A Myers & Sons Noise reducing hearing aid case
US2585052A (en) * 1948-04-23 1952-02-12 Int Standard Electric Corp Granule type acoustic transducer
US2778882A (en) * 1951-01-11 1957-01-22 Lustraphone Ltd Microphones
DE1078174B (de) * 1956-02-25 1960-03-24 Dr Emil Podszus Aufhaengung fuer Lautsprechermembranen mit besonderer Daempfung

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3396241A (en) * 1964-10-23 1968-08-06 Russell K Anderson Stethoscope with sound spectrum selection
US3819879A (en) * 1971-12-20 1974-06-25 Ibm Electro-acoustic transducer housing adapted for telephonic pcm communication systems
US4086445A (en) * 1977-01-18 1978-04-25 Northern Telecom Limited Telephone handset transmitter with improved output response
US4637489A (en) * 1984-09-04 1987-01-20 Nippon Chem-Con Corp. Electroacoustic transducer
US4742887A (en) * 1986-02-28 1988-05-10 Sony Corporation Open-air type earphone
US4727583A (en) * 1986-10-28 1988-02-23 Motorola, Inc. Telephone transducer with improved frequency response
WO1989004106A1 (en) * 1987-10-28 1989-05-05 Acs Communications, Inc. Acoustic filter microphone cup
US4864611A (en) * 1987-11-24 1989-09-05 Helmuth Keld T Telephone handset attachment for use in-the-ear hearing aids
US4977975A (en) * 1989-09-14 1990-12-18 Lazzeroni John J Vented motorcycle helmet speaker enclosure
US7305098B2 (en) * 2002-05-24 2007-12-04 Phonak Ag Hearing device
US20030219138A1 (en) * 2002-05-24 2003-11-27 Andi Vonlanthen Hearing device
US20070160245A1 (en) * 2006-01-10 2007-07-12 Yan-Ru Peng Personal voice-transmitted device
US9036851B2 (en) 2006-01-10 2015-05-19 Yan-Ru Peng Methods and apparatuses for sound production
US20080123890A1 (en) * 2006-11-29 2008-05-29 Yan-Ru Peng Methods and apparatus for sound production
US8111854B2 (en) 2006-11-29 2012-02-07 Yan-Ru Peng Methods and apparatus for sound production
US20150139432A1 (en) * 2013-10-30 2015-05-21 SVANTEK Sp. z o.o Device for measuring sound level
US9510117B2 (en) * 2013-10-30 2016-11-29 Svantek Sp. Zo.O. Device for measuring sound level
US10171905B2 (en) * 2016-02-14 2019-01-01 Transound Electronics Co., Ltd. Headphones with frequency-targeted resonance chambers
US11451891B2 (en) * 2017-07-18 2022-09-20 Shure Acquisition Holdings, Inc. Moving coil microphone transducer with secondary port
US20200045402A1 (en) * 2018-08-02 2020-02-06 EVA Automation, Inc. Headphone with Multiple Acoustic Paths
US10623847B2 (en) * 2018-08-02 2020-04-14 EVA Automation, Inc. Headphone with multiple acoustic paths

Also Published As

Publication number Publication date
NL291745A (fi)
NL142042B (nl) 1974-04-16
CH399542A (de) 1965-09-30
SE318610B (fi) 1969-12-15
FI42731B (fi) 1970-06-30
DE1188656B (de) 1965-03-11
BE631608A (fi)
GB999378A (en) 1965-07-21

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