US3334184A - Loudspeaker with feedback signal generator - Google Patents
Loudspeaker with feedback signal generator Download PDFInfo
- Publication number
- US3334184A US3334184A US370262A US37026264A US3334184A US 3334184 A US3334184 A US 3334184A US 370262 A US370262 A US 370262A US 37026264 A US37026264 A US 37026264A US 3334184 A US3334184 A US 3334184A
- Authority
- US
- United States
- Prior art keywords
- loudspeaker
- cone
- attached
- transducer
- apex
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
- H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
-
- 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 invention relates to a loudspeaker arrangement in which the movable portion of the loudspeaker is connected to a transducer for producing a voltage corresponding to the acceleration of the said movement.
- the object of the present invention to provide a loudspeaker in which the said disadvantages are obviated.
- the invention is characterized in that the transducer is secured to the apex of a conical member the base of which is attached to the device for driving the movable portion of the loudspeaker.
- the loudspeaker in accordance with the invention comprises a movable portion in the form of a cone diaphragm 1 which is driven by a coil former 2 which is attached to the said diaphragm and on which a loudspeaker coil 3 is provided.
- the coil former 2 together with the coil 3 are disposed within a magnet system shown diagrammatically, the arrangement being such that currents supplied to the loudspeaker coil 3 cause axial forces to be applied to the coil former so that the cone diaphragm is set into motion.
- the said currents are produced by means of a loudspeaker amplifier 4 to which audio input signals from a source 5 are applied.
- the transducer 6 is attached to the cone diaphragm a piezoelectric transducer 6 upon which an inertia proportional to the acceleration of the loudspeaker cone diaphragm is exerted.
- the transducer is preferably made of a crystal material and hence is very hard. If the loudspeaker is accommodated in the wall 9 of an otherwise closed cabinet, for oscillations having a wavelength greater than one half of the circumference of the loudspeaker cone diaphragm the transducer pro- Patented Aug.
- the joining means may provide difficulty in this respect. Due to the hardness of the crystal material from which is constructed transducer 6 it may unintentionally absorb mechanical forces and hence produce corresponding electric voltages.
- the transducer 6 is secured to the apex of an axially rigid conical member 8, the base of which is attached to the loudspeaker diaphragm.
- the conical member points in the direction in which the sound is radiated and consequently has acoustically satisfactory radiation properties.
- it is so flexible radially as to prevent the transmission of radial forces from the conical diaphragm 1 to the solid cone apex to which the transducer 6 is secured.
- the conical member is enclosed by a plate 10 to prevent pressure variations in the surrounding air from affecting the transducer.
- the invention is based on the recognition that the axial movement of the cone 1 involves radial reaction forces exerted on the diaphragm 1 by the wall 9. These reaction forces reach the base of the conical member 8, attached to the coil former 3, along its entire circumference. Owing to the flexible conical construction chosen, however, they will be materially attenuated before reaching the apex of the conical member 8 so that no pressure corresponding to the said radial forces reaches the transducer 6 and hence the voltage delivered by the transducer 6 corresponds substantially to the axial accelerations only. Thus an important source of distortion in the production of a negative-feedback voltage is avoided.
- the loudspeaker was provided with a conical diaphragm 1 having a diameter of 13 cm. and an apical angle of
- the diameter of the coil former 3 was 2.6 cm. and its length 2.5 cm.
- the conical member 8 was made of aluminium and had an apical angle of 40.
- the diameter of the transducer 6 was 0.6 cm. and its length 1.6 cm. Its mass was of the same order of magnitude as that of the coil 3.
- a loudspeaker for translating electrical signals into acoustic waves comprising, a radiating cone having its outer portion attached to a fixed support, first means attached to the inner portion of said cone for causing said cone to oscillate in response to electric signals when supplied to said means, a conical support means having its base attached to the said first means for movement thereby and its apex free standing, and a transducer mounted within the conical support means and attached to the support means at the apex for providing a voltage corresponding to the cone acceleration.
- a loudspeaker for translating electrical signals into acoustic Waves comprising, a radiating cone having its outer portion attached to a fixed support, first means for establishing a positionally fixed magnetic field, second means located within the magnetic field and including a voice coil attached to the inner portion of said cone for causing said cone to oscillate in response to electric signals
- a conical support 10 means having its base attached to said second means for movement thereby and its apex free standing, and a transducer mounted within the conical support means and References Cited UNITED STATES PATENTS 8/1960 Clements 179-1 11/1961 Bekey 179l KATHLEEN H. CLAFFY, Primary Examiner.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Circuit For Audible Band Transducer (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL294443 | 1963-06-21 | ||
NL298464 | 1963-09-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3334184A true US3334184A (en) | 1967-08-01 |
Family
ID=26641913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US370262A Expired - Lifetime US3334184A (en) | 1963-06-21 | 1964-05-26 | Loudspeaker with feedback signal generator |
Country Status (11)
Country | Link |
---|---|
US (1) | US3334184A (es) |
AT (1) | AT247437B (es) |
BE (1) | BE649606A (es) |
CH (1) | CH434372A (es) |
DE (1) | DE1268680B (es) |
DK (1) | DK117642B (es) |
ES (1) | ES301214A1 (es) |
FR (1) | FR1401643A (es) |
GB (1) | GB1016115A (es) |
NL (2) | NL298464A (es) |
SE (1) | SE301503B (es) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5034223A (es) * | 1973-06-12 | 1975-04-02 | ||
US3937887A (en) * | 1969-05-15 | 1976-02-10 | Ben O. Key | Acoustic power system |
US4176305A (en) * | 1976-12-23 | 1979-11-27 | Siemens Aktiengesellschaft | Galvano magnetic position control system |
FR2455839A1 (fr) * | 1979-05-03 | 1980-11-28 | Electro Audio Dynamics | Procede et dispositif de protection d'un transducteur electromecanique |
US4759065A (en) * | 1986-09-22 | 1988-07-19 | Harman International Industries, Incorporated | Automotive sound system |
US4809338A (en) * | 1985-07-05 | 1989-02-28 | Harman International Industries, Incorporated | Automotive sound system |
US5471527A (en) * | 1993-12-02 | 1995-11-28 | Dsc Communications Corporation | Voice enhancement system and method |
US5493620A (en) * | 1993-12-20 | 1996-02-20 | Pulfrey; Robert E. | High fidelity sound reproducing system |
US20120213388A1 (en) * | 2011-02-18 | 2012-08-23 | Rockefeller University | Unidirectional Mechanical Amplification in a Microphone |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2420689C3 (de) * | 1974-04-29 | 1984-09-20 | Arndt 7500 Karlsruhe Klingelnberg | Verfahren und Anordnung zur Verbesserung der Eigenschaften elektrodynamischer Wandler durch Bewegungsgegenkopplung |
NO172469C (no) * | 1984-01-25 | 1993-07-21 | Per Kirksaeter | Anordning for lydgjengivelsessystem |
GB2201318B (en) * | 1987-02-12 | 1990-10-24 | Udi Group Ltd | Electromechanical transducer |
DE3707620A1 (de) * | 1987-03-10 | 1987-10-15 | Ultrasonics Schallfeld Messtec | Beschleunigungssensor fuer dynamische lautsprecher |
GB2260875B (en) * | 1991-10-23 | 1995-06-28 | Anthony Best Dynamics Ltd | Noise source |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2948778A (en) * | 1956-05-07 | 1960-08-09 | Warner W Clements | Sound reproducing means |
US3009991A (en) * | 1955-12-01 | 1961-11-21 | Bekey Ivan | Sound reproduction system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE451710A (es) * | 1942-08-14 | |||
US2860183A (en) * | 1954-02-01 | 1958-11-11 | Conrad Ivan Willard | Sound reproducing system |
-
0
- NL NL294443D patent/NL294443A/xx unknown
- NL NL298464D patent/NL298464A/xx unknown
-
1964
- 1964-05-26 US US370262A patent/US3334184A/en not_active Expired - Lifetime
- 1964-06-18 GB GB25283/64A patent/GB1016115A/en not_active Expired
- 1964-06-18 SE SE7545/64A patent/SE301503B/xx unknown
- 1964-06-18 CH CH801164A patent/CH434372A/de unknown
- 1964-06-18 DK DK307964AA patent/DK117642B/da unknown
- 1964-06-18 AT AT522564A patent/AT247437B/de active
- 1964-06-18 DE DEP1268A patent/DE1268680B/de not_active Withdrawn
- 1964-06-19 ES ES0301214A patent/ES301214A1/es not_active Expired
- 1964-06-22 BE BE649606A patent/BE649606A/xx unknown
- 1964-06-22 FR FR979165A patent/FR1401643A/fr not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3009991A (en) * | 1955-12-01 | 1961-11-21 | Bekey Ivan | Sound reproduction system |
US2948778A (en) * | 1956-05-07 | 1960-08-09 | Warner W Clements | Sound reproducing means |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3937887A (en) * | 1969-05-15 | 1976-02-10 | Ben O. Key | Acoustic power system |
JPS5034223A (es) * | 1973-06-12 | 1975-04-02 | ||
US3941932A (en) * | 1973-06-12 | 1976-03-02 | U.S. Philips Corporation | Loudspeaker having a voice coil and a piezoelectric feedback transducer |
US4176305A (en) * | 1976-12-23 | 1979-11-27 | Siemens Aktiengesellschaft | Galvano magnetic position control system |
FR2455839A1 (fr) * | 1979-05-03 | 1980-11-28 | Electro Audio Dynamics | Procede et dispositif de protection d'un transducteur electromecanique |
US4327250A (en) * | 1979-05-03 | 1982-04-27 | Electro Audio Dynamics Inc. | Dynamic speaker equalizer |
US4809338A (en) * | 1985-07-05 | 1989-02-28 | Harman International Industries, Incorporated | Automotive sound system |
US4759065A (en) * | 1986-09-22 | 1988-07-19 | Harman International Industries, Incorporated | Automotive sound system |
US5471527A (en) * | 1993-12-02 | 1995-11-28 | Dsc Communications Corporation | Voice enhancement system and method |
US5493620A (en) * | 1993-12-20 | 1996-02-20 | Pulfrey; Robert E. | High fidelity sound reproducing system |
US20120213388A1 (en) * | 2011-02-18 | 2012-08-23 | Rockefeller University | Unidirectional Mechanical Amplification in a Microphone |
US9084051B2 (en) * | 2011-02-18 | 2015-07-14 | The Rockefeller University | Unidirectional mechanical amplification in a microphone |
Also Published As
Publication number | Publication date |
---|---|
FR1401643A (fr) | 1965-06-04 |
NL298464A (es) | |
ES301214A1 (es) | 1965-01-16 |
DE1268680B (de) | 1968-05-22 |
GB1016115A (en) | 1966-01-05 |
SE301503B (es) | 1968-06-10 |
AT247437B (de) | 1966-06-10 |
CH434372A (de) | 1967-04-30 |
BE649606A (es) | 1964-12-22 |
NL294443A (es) | |
DK117642B (da) | 1970-05-19 |
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