EP0126783A1 - Tête artificielle à large bande, exempte de bruit, à grande dynamique avec la propriété de transmission fidèle de signaux auditifs - Google Patents

Tête artificielle à large bande, exempte de bruit, à grande dynamique avec la propriété de transmission fidèle de signaux auditifs Download PDF

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Publication number
EP0126783A1
EP0126783A1 EP83105141A EP83105141A EP0126783A1 EP 0126783 A1 EP0126783 A1 EP 0126783A1 EP 83105141 A EP83105141 A EP 83105141A EP 83105141 A EP83105141 A EP 83105141A EP 0126783 A1 EP0126783 A1 EP 0126783A1
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EP
European Patent Office
Prior art keywords
head
replica
ear
sound
microphone
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Withdrawn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
EP83105141A
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German (de)
English (en)
Inventor
Klaus Genuit
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.)
Head Stereo GmbH Kopfbezogene Aufnahme und Weidergabetechnik and Co Messtechnik KG
Original Assignee
Head Stereo GmbH Kopfbezogene Aufnahme und Weidergabetechnik and Co Messtechnik KG
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.)
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Publication date
Application filed by Head Stereo GmbH Kopfbezogene Aufnahme und Weidergabetechnik and Co Messtechnik KG filed Critical Head Stereo GmbH Kopfbezogene Aufnahme und Weidergabetechnik and Co Messtechnik KG
Priority to EP83105141A priority Critical patent/EP0126783A1/fr
Publication of EP0126783A1 publication Critical patent/EP0126783A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/027—Spatial or constructional arrangements of microphones, e.g. in dummy heads
    • 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
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces

Definitions

  • the invention relates to a two-channel electroacoustic transmission system according to the preamble of claim 1, which is assigned to the category of so-called artificial head recording or artificial head transmission systems.
  • This "black hole” meant an almost conical area, the tip of which falls in the center of the head, the axis parallel to the line of intersection between the horizontal plane and the plane of symmetry of the head, and in which listening events occur rarely or never when the artificial head signals are reproduced via headphones.
  • - GENUIT and PLATTE / 15 / were found on test subjects as typical suspected asymmetries in the acoustic transmission behavior between the left and right outer ear. Such asymmetries are not structurally taken into account in previously known artificial heads (eg / 5 /, / 14 /) or even, e.g. B, in / 16 /, consciously been avoided.
  • - KUHN / 17 / showed that the formerly negligible acoustic influence of the upper body on the outer ear directional characteristic can be demonstrated up to frequencies of 1500 Hz.
  • KUHN also demonstrated in / 17 / that the acoustic impedance of human skin has only a negligible influence on the directional characteristics of the outer ear.
  • the microphone coupling in the artificial head represents a significant design feature of an artificial head that influences other design features and even depends on other features
  • the artificial head according to / 8 / should not be regarded as the essential inventive solution to the artificial head problem that only lacks a little additional effort to reduce noise.
  • WOLLHERR also shows in / 20 / that the signal-to-noise ratio of the artificial head realized by HUDDE and SCHROETER / 8 / is not acceptable for professional electro-acoustic recording technology.
  • the artificial head In order not to create a discrepancy between the hearing and the viewing angle, the artificial head must be behind the camera and, when using lenses with a long focal length, tolerate a correspondingly large shooting distance. H. still deliver noiseless electrical output signals at low acoustic signal levels.
  • Fig. 1 shows in the form of an exploded view the front view of the essential mechanical components of the artificial head recording system according to the invention, as shown to the user when viewed from the outside.
  • Fig. 2 shows the corresponding side view.
  • the head replica (1) carries the left and right side of the auricle replicas (102) and (202 ⁇ .
  • Each auricle replica (102, 202) is firmly connected to a cylindrical body (101), (201) and thus forms the respective ear insert (100), (200), which can be easily removed from the side of the head replica (1) and is just as easy to reinsert.
  • an optically transparent location (22) as a functional part of an optical projection device integrated in the head replica ( 25) which allows the head to be aimed at a "target", usually a sound source or an acoustic fixed point in the recording room, the arrangement being rotated in accordance with FIG. 1 or FIG the projection device (25) connected to the head replica (1) projects a light mark onto the respective target object.
  • a target usually a sound source or an acoustic fixed point in the recording room
  • the head replica (1) which is firmly connected to the head base plate (40), is normally placed on the shoulder replica (300) and locked there by means of a quick-clamp connection.
  • the shoulder replica (300) is in turn normally placed on the box (400), the guide rods (306) (307) being inserted through the holes (414), (415) into the interior of the box (400); the shoulder replica (300) and box (4000) are then connected to one another by means of screw (416) and threaded hole (305).
  • the box (400) is shaped in such a way that, in conjunction with the shoulder replica (300), it roughly replicates the torso of a representative test subject
  • the box (400) as the lower part of the upper body replica contains on the one hand the larger part (418) of the electronics necessary for the operation according to the invention, on the other hand the space (403) and the fastening means (405), (406), (407), (408) , (409), (410) for a small, high-quality magnetic tape recording system, consisting, for example, of a compander unit (419) and a small analog magnetic tape device (420) or a so-called PCM adapter (421) and a small video recorder (422
  • the bottom is re space (403) of the box (400) lined with sound-absorbing material (404) and the flap (401) is provided with acoustic sealing tape (402), so
  • the level indicator (413) also attached to the box (400) enables the user to check the correct leveling of the magnetic tape device (420) or (422) that is not visible during operation in the box (400) without further aids.
  • the thread (411) introduced at the bottom of the box (400) is used to fasten the box (400) on a tripod.
  • Fig. 4 shows the head base plate (40) which is normally firmly screwed to the head replica (1).
  • the centering hole (41) and the bayonet holes (42), (43) in the head base plate (40) serve to connect the head replica (1) to the shoulder replica (300).
  • the head replica (1) is first brought so far to the shoulder replica (300) that the centering pin (301) into the centering hole ( 41) engages.
  • the head replica (1) must be rotated around the engaging centering pin (301) so that the bayonet indexing pins (302) and (303) can dip into the bayonet holes (42) and (43).
  • a multi-pin plug or a multi-pin socket (45) is inserted, which provides a quick-release electrical connection between the microphones (130) attached to the inside of the head replica (1), (230) resp. Impedance converter (131), (231) with the electronics (418) housed in the box (400) allowed.
  • the hole (44) in the head base plate (40) with a thread that is common for tripods is introduced at such an angle against the surface normal that when screwed together with a vertical stowage (50) - cf. Fig.
  • the head replica (1) takes the inclination according to the invention to the horizontal and vertical, according to the experimentally determined casual inclination of a representative test subject.
  • the same inclination of the head replica (1) according to the invention is achieved when mounted on the shoulder replica (300) standing on a horizontal surface.
  • Fig. 3 shows a side view of this case.
  • Fig. 6 shows the left ear insert (100) - representative of the correspondingly constructed right ear insert (200) - in different sections or views.
  • Fig. 3 shows the left ear insert (100) in the position according to the invention in the head replica (1). This position was determined by stereometric transmission of the positional relation between the auricle structure and the reference areas (18), (19) (201 (21) of the face by a representative test subject on the head replica (l).
  • the auricle (102) is firmly connected to a cylindrical body (101) with a non-rotationally symmetrical cross-sectional area and the cylindrical body (101) is to be inserted into a pipe section (4) with a mechanical depth stop that is firmly connected to the head replica (1) (cf. FIG. 7).
  • the non-rotationally symmetrical design of the cross-sectional area of the cylindrical body (101) forming a fit with the cylindrical tube (2) prevents rotation of the ear cup replica (102) against its predetermined fixation relative to the geometry of the head replica (1).
  • the depth stop for the insertion of cylindrical body (101) into the tube (2), which is carried out by grooves (106) (107), (108) and counterparts (8), (10), (12), is fitted in such a way that the auricle replica (101) has the distance from the lateral head surface found in a representative test subject.
  • the front surface (103) of the cylindrical body (101) facing the auricle replica (102) is only changed against the one on the basis of a replica of the corresponding head surface section of a representative test subject to such an extent that after the cylindrical body (101) has been inserted into the assigned tube ( 4) until the mechanical stop, the outer end surface (103) of the cylindrical body (101) continuously merges into the surrounding surface area (6) of the head replica (1) on all sides (cf. FIG. 7).
  • the front surface (104) of the cylindrical body (101) facing away from the auricle replica (102) is designed as a receptacle for the microphone (130) and the impedance converter (131).
  • the cylindrical material recess (111) accommodates the microphone (130) of the type 4166 from the Danish manufacturer Brüel + Kjaer / 29 / in such a way that, on the one hand, a coupling volume (112) specified according to the invention and an equally specified piece (113) of an ear canal reproduction remain, and on the other hand, that Microphone (130), which is screwed to the impedance converter (131), by screwing the Impedance converter (131) with the end face (104) of the cylindrical body (101) is fixed in the position according to the invention.
  • the threaded holes (1091 (110) accommodate the fastening screws for the impedance converter (131).
  • the space between the microphone (130) and the input plane (114) of the ear canal replica - consisting of the subspaces coupling volume (112) and piece of ear canal (113) - is selected in terms of its volume and its linear dimensions so that it is combined with the acoustic input impedance of the microphone used according to / 29 / sets an acoustic cavity resonance at 12 kHz.
  • This resonance which is preferably located above the upper cut-off frequency of the microphone (130), is used according to the invention as a passive and thus noise-free amplification to increase the signal-to-noise ratio in the frequency range of the cavity resonance and thus in practice to increase the cut-off microphone frequency in the artificial head system, compared to the constructive one predetermined upper limit frequency of the microphone (130) when operating in a free sound field.
  • the area of the head replica (1) corresponding to the hairy parts of the human head is covered with sound-absorbing material (17) (cf. FIGS. 1, 3 and 5).
  • the surface of the shoulder replica (300), in particular the surface part directly facing the auricle replicas (102) and (202), is also covered with sound-absorbing material (308).
  • the outer surface of the box (400) is also covered with acoustically absorbing material (417).
  • Fig. 8 and Fig. 9 show the schematic block diagram of the entire artificial head electronics, consisting of the power supply part of Fig. 9 and two identically constructed signal branches corresponding to Fig. 8.
  • the power supply part (Fig. 9) is either with the local mains voltage or from batteries to operate with preferably 12 V; it generates the operating voltages necessary for the operation of the circuit according to FIG. 8 with the aid of the direct voltage converters (532) and (533).
  • the changeover relay (531) is connected in such a way that when the local mains voltage is applied to the corresponding input of the power supply part (530), a battery that may be connected at the same time is disconnected from the input of the DC voltage converter (532) and the signal processing electronics according to FIG. 8 from the lighting network is supplied. When the mains voltage is switched off, the changeover relay (531) automatically switches to voltage supply from batteries.
  • Fig. 8 shows the signal processing electronics using the example of the left channel.
  • the right channel is built entirely accordingly.
  • the left microphone (130) of the system according to the invention is connected to the impedance converter (131) arranged in the immediate vicinity within the head replica (l), the output signal of which is connected to a connection of a changeover switch (500) via a cable (132) guided inside the artificial head neck .
  • the changeover switch (500) either connects the output (507) of the impedance converter (131) or the output (508) of a test tone generator (501) to the input of the artificial head equalizer (502), during normal operation the changeover switch (500) connects the output (507 ) of the impedance converter (131) with the input of the artificial head equalizer (502).
  • the output level of this artificial head equalizer (502) is displayed on a peak value display (503) for the continuous control of the modulation.
  • the output signal of the artificial head equalizer (502) is amplified or converted in level to z.
  • the left so-called artificial head signal is then available at the output (509) of the output driver (504) for recording or transmission.
  • the right artificial head signal is present at the output of a corresponding right electronics, which in turn consists of the right microphone (230), the right impedance converter (231), the right connection cable (232), the right switch (600), the right artificial head equalizer (6021, the right test tone generator (601), the right peak indicator (603) and the right output driver (604).
  • the left and right test tone generators (501) and (601) act as substitute voltage sources for the respective combination of microphone (130) or (230) and impedance converter ( 131) or (231).
  • the test tone generators (501) and (601) deliver at a calibration frequency of z. B. 240 Hz the same output level as the assigned impedance converter (131) or (231) when applied to the respective microphone (130) or (230) with an introduced calibration sound level of z. B. 94 dB in the free sound field.
  • This switchover option from microphone to test tone generator allows the artificial head user to set or calibrate his downstream recording or transmission system in such a way that that the transmission factor "over everything", ie from the acoustic input signal of the artificial head to the acoustic output signal of the playback transducer, for. B, the headphones (506) and (606) takes a predetermined value. In the case of the transmission true to the original, this transmission factor would have to be equal to 1.
  • the coupled changeover switches (500) and (600) would be brought into the position shown in FIG. 8 for normal operation.
  • the microphone signals preprocessed in accordance with FIG. 8 can then be tapped and transmitted from the outputs (509), (609) of the output drivers (504), (604) or recorded on magnetic tape or reproduced directly via loudspeakers or adapted headphones.
  • the artificial head electronics (400) contains two headphone equalizers (505), (605) which are matched to suitable headphones (506) (606).
  • These headphones are - in accordance with the basic claim according to the invention - selected or constructed so that they can reproduce the large dynamic range of the artificial head recording system according to the invention, in particular at very low and very high frequencies, without audible distortion.
  • FIG. 10 shows the free-field outer ear transmission function of a representative test subject when the sound is incident horizontally from the front.
  • the elevations (551) and (552) and the break-in (553) are particularly attributable to the acoustic effect of the shoulder.
  • the other structures result from the acoustic interaction of head, auricle and auditory canal.
  • the requirement that the measured transfer function of the interconnection of the artificial head and the artificial head equalizer must be the same as the representative transfer function of a measuring microphone (e.g.
  • FIG. 13 shows the spectral noise power densities (562) and (662) of the left and right channels of the artificial head recording system according to the invention in comparison with the noise power density (570) corresponding to the human hearing threshold (cf. e.g. Zwicker et. Al. / 28 / ).
  • the human hearing threshold (570) lies in the range of the respective noise power density (562), (662) of the artificial head recording system, ie the background noise of the human ear is in the order of the invention according artificial head recording system.
  • the noise power density (562), (662) of the artificial head recording system in the current embodiment described here is still up to 5 dB above the noise power density (570) of the human ear; however, this property can be further optimized in practice in accordance with claims 18 and 19.
  • the slight differences in the noise power density of the left and right channels can be explained from the slight differences in the transfer functions (560), (660) of the two artificial head equalizers (502), (602).
  • each of these equalizers including the left and right artificial head transfer function determined by measurement, is calculated and implemented in such a way that the left microphone (130) with the left impedance converter (131) and the left artificial head equalizer (502) has the same transfer function (550) for sound incidence approximated horizontally from the front like the right microphone (230) with the right impedance converter (231) and the right artificial head equalizer (602).
  • Fig. 11 shows the transfer functions (560) and (660) of the left and right artificial head equalizers.
  • the upper body simulation formed by the elements (300) and (400) is covered with acoustically absorbing material (417).
  • the box (400) acts as a lower part of the upper body simulation formed by (400) and (300), in particular as a housing for the electrical, electronic and electromechanical components required for operating the system according to the invention.
  • the box contains in particular a transportable and operational receptacle (405), (406) or (407), (408), (409), (410) for a small magnetic tape recorder (420) or (421), (442).
  • the surface of the head replica (1) corresponding to the hairy surface of the natural head is covered with acoustically absorbing material (17).
  • the space (112), (113), (212), (213) between the ear canal entrance (114), (214) - defined by the floor of the main cavity (115), (215) of the ear cup replica (102), (202) - And the membrane of the other end of the cylindrical body (101), (201) coupled microphone (130), (230) is designed in its volume and in its linear dimensions so that an acoustic resonance occurs at 12 kHz.
  • This acoustic resonance at 12 kHz acts like a passive amplifier connected upstream of the microphone (130), (230), which extends the frequency range usable in the free sound field with the microphone (130), (230) upwards and increases the signal-to-noise ratio.
  • the microphone (130), (230) used is selected in terms of its equivalent volume or constructed in such a way that an adjustment to what has been said is possible.
  • the microphones (130), (230) used are designed or selected or so adjusted in their operating parameters so that the noise power density (562) (662) of the microphones - measured in the system according to the invention - does not exceed or only slightly exceeds the noise power density (570) equivalent to the human hearing threshold, ie the background noise of the microphones (130), (230) remains completely or at least almost inaudible.
  • the microphones (130), (230) are constructed or selected or are operated with such operating parameters that switching signals with levels in the range of the typical human pain threshold experience no audible or disturbing distortions by the microphones.
  • a high-performance compander system (419), for example TELCOM c4 from AEG-Telefunken, can be an integral part of the electronic components arranged in the box (40), so that it is possible to use broadband, low noise and high dynamics of the artificial head according to the invention even when playing back as a record on analog Get magnetic tape.
  • a so-called PCM adapter (421) for recording the signals at the output (509), (609) on magnetic tape in PCM technology can be an integral part of the electronic components arranged in the upper body simulation (300), (400), which it allowed to maintain broadband.
  • Two equalization filters (502t (602) with the transfer functions (560), (660) specially matched to the artificial head are an integral part of the electronic components housed in the box (400).
  • direct voltage converters (532), (533) for operating voltage supply, in particular of components (418), (419) made of batteries, are an integral component of the electronic components housed in the upper body simulation (300), (400).
  • Operating and function control displays (413) are attached to a point of the box (400) or the shoulder replica (300) or the head replica (1) which is clearly visible from the outside.
  • the box (400) or the shoulder replica (300) carries in particular permanently mounted plugs or sockets (412) for connecting supply, output and control lines and for connecting a remote control part for an internal magnetic tape device (420) or (422).
  • the shoulder replica (300) is designed and provided with two guide rods (306), (307) so that it can be attached as part of a seat back or instead of a headrest or as part of it in particular in a vehicle and there in addition to the acoustic function for the artificial head still takes on the protective, supportive or impact-reducing function of the seat part or support part in whose place the shoulder replica (300) is inserted.
  • the head replica is attached to the shoulder replica (300) by means of a quick clamp connection.
  • This quick clamp connection is preferably designed as a bayonet lock with the parts (41), (42), (43), (301), (302), (303).
  • the head replica (1) is permanently connected to a direction finder (24) or a light-optical projection device (25), by means of which a clear point in a direction specified by the head geometry is located at a distance in this direction Object or body is determined.
  • the light-optical projection device (25) which functions in particular as a light pointer, is mounted within the head replica (l) and is fixedly connected to it and projects a light marking onto an object or body that is distant in the direction determined by the orientation of the head replica (1).
  • the direction finder device (24) connected to the head replica (l) consists in particular of two head openings (22), (231 which - like the rear sight and front sight of a weapon - allow "aiming" at a distant object.
  • the direction defined by the direction finding device (24) or projection device (25) lies preferably in the horizontal plane (14) through the ear canal inputs (116) (216) and at the same time in the acoustic or mechanical plane of symmetry (15) of the head replica (1 ).
  • a level tone generator (501), (601) assigned to the respective microphone (130), (230) is preferably an integral part of the electronic components housed in the box (400), the an output voltage at z. B. 240 Hz corresponding to the output voltage of the respective microphone (130) (230) at a fixed sound pressure level (z. B. 94 dB) at the location of the head replica (1) and after switching from the respective impedance converter output (507), (607) the output (508), (608) of the level tone generator (501), (601) allows the calibration of all subsequent electronics up to the playback headphones (5061 (606).
  • the lower part of the box (400) is designed as a soundproof capsule around the magnetic tape device (420) or (422) causing the running noise, one wall of which is formed by the soundproof closing flap (401).
  • the soundproof capsule is additionally lined with sound-absorbing material (403) in the lower part of the box (400).
  • Both the shoulder replica (300) and the box (400) are provided with a common tripod thread (305), (411) on the bottom.
  • each cylindrical body (101), (201) in the respective cylindrical pipe section (2), (3) is carried out by three grooves (106), (107), (108) or (206), (207), (208) in the cylindrical bodies (101), (201) and corresponding counterparts (8), (10) (12) or (9), (11), (13) in the cylindrical tube pieces (2), (3rd ).

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic Arrangements (AREA)
EP83105141A 1983-05-25 1983-05-25 Tête artificielle à large bande, exempte de bruit, à grande dynamique avec la propriété de transmission fidèle de signaux auditifs Withdrawn EP0126783A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP83105141A EP0126783A1 (fr) 1983-05-25 1983-05-25 Tête artificielle à large bande, exempte de bruit, à grande dynamique avec la propriété de transmission fidèle de signaux auditifs

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Application Number Priority Date Filing Date Title
EP83105141A EP0126783A1 (fr) 1983-05-25 1983-05-25 Tête artificielle à large bande, exempte de bruit, à grande dynamique avec la propriété de transmission fidèle de signaux auditifs

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EP0126783A1 true EP0126783A1 (fr) 1984-12-05

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU574625B2 (en) * 1984-03-27 1988-07-07 Head Acoustics GmbH Kopfbezogene Aufnahme-und Wiedergabetechnik Messtechnik Artificial head measuring system
WO1988007803A1 (fr) * 1987-03-21 1988-10-06 Head Stereo Gmbh Kopfbezogene Aufnahme- Und Wieder Dispositif de filtrage de signaux acoustiques
EP0500294A2 (fr) * 1991-02-16 1992-08-26 Nippon Broadcasting System, Inc. Appareil de reproduction sonore stéreo
EP1016315A1 (fr) * 1996-07-07 2000-07-05 Visual Sound Limited Partnership Procede et dispositif de capture du son
CN101867863A (zh) * 2010-05-21 2010-10-20 工业和信息化部电信传输研究所 音频测试系统
US9103747B2 (en) 2010-10-20 2015-08-11 Lear Corporation Vehicular dynamic ride simulation system using a human biofidelic manikin and a seat pressure distribution sensor array
CN105187970A (zh) * 2015-09-21 2015-12-23 歌尔声学股份有限公司 一种头戴耳机的佩戴检测用工装
CN105993207A (zh) * 2013-11-15 2016-10-05 罗伯特·博世有限公司 用于装配麦克风构件的电路板和具有这种电路板的麦克风模块

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GB2071962A (en) * 1980-03-12 1981-09-23 Philips Nv Positioning an electro-acoustic transducer relative to a users mouth

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DE2319048A1 (de) * 1971-08-23 1974-10-31 R D Systems Of Canada Ltd Parabolischer tonreflektierender mikrophonhalter
DE2554229A1 (de) * 1975-12-03 1977-06-16 Licentia Gmbh Vorrichtung fuer richtungsempfindliche mikrofone zur anzeige des gebietes optimaler empfindlichkeit
GB2071962A (en) * 1980-03-12 1981-09-23 Philips Nv Positioning an electro-acoustic transducer relative to a users mouth

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FUNKSCHAU, Nr. 7, 1982, Seiten 72,77,78, München, DE; K. GENUIT: "Entstehung eines Kunstkopfsystems" *
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU574625B2 (en) * 1984-03-27 1988-07-07 Head Acoustics GmbH Kopfbezogene Aufnahme-und Wiedergabetechnik Messtechnik Artificial head measuring system
WO1988007803A1 (fr) * 1987-03-21 1988-10-06 Head Stereo Gmbh Kopfbezogene Aufnahme- Und Wieder Dispositif de filtrage de signaux acoustiques
EP0500294A2 (fr) * 1991-02-16 1992-08-26 Nippon Broadcasting System, Inc. Appareil de reproduction sonore stéreo
EP0500294A3 (fr) * 1991-02-16 1994-04-27 Nippon Broadcasting System Inc
EP1016315A1 (fr) * 1996-07-07 2000-07-05 Visual Sound Limited Partnership Procede et dispositif de capture du son
EP1016315A4 (fr) * 1996-07-07 2003-04-09 High Definition Audio Llc Procede et dispositif de capture du son
CN101867863A (zh) * 2010-05-21 2010-10-20 工业和信息化部电信传输研究所 音频测试系统
CN101867863B (zh) * 2010-05-21 2012-12-26 工业和信息化部电信传输研究所 音频测试系统
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CN105993207A (zh) * 2013-11-15 2016-10-05 罗伯特·博世有限公司 用于装配麦克风构件的电路板和具有这种电路板的麦克风模块
CN105993207B (zh) * 2013-11-15 2019-10-18 罗伯特·博世有限公司 用于装配麦克风构件的电路板和具有这种电路板的麦克风模块
CN105187970A (zh) * 2015-09-21 2015-12-23 歌尔声学股份有限公司 一种头戴耳机的佩戴检测用工装
CN105187970B (zh) * 2015-09-21 2018-06-15 歌尔股份有限公司 一种头戴耳机的佩戴检测用工装

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