US3070658A - Stereophonic sound collecting device - Google Patents

Stereophonic sound collecting device Download PDF

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Publication number
US3070658A
US3070658A US675068A US67506857A US3070658A US 3070658 A US3070658 A US 3070658A US 675068 A US675068 A US 675068A US 67506857 A US67506857 A US 67506857A US 3070658 A US3070658 A US 3070658A
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US
United States
Prior art keywords
microphones
plate
sound
rotatable
sound collecting
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
Application number
US675068A
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English (en)
Inventor
Kleis Derk
Snoek Johannes
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.)
US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3070658A publication Critical patent/US3070658A/en
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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

Definitions

  • an acoustical obstacle provided on either side with a microphone.
  • an obstacle is usually shaped in the form of a ball and therefore the obstacle is often termed artificial head.
  • the spherical shape of the artificial head is found to be of no essential importance.
  • the determinative factor is the screening effect, i.e. the detour about the artificial head.
  • the shape of the artificial head need not be restricted to the spherical form, if it serves as a sound screening surface between at least two microphones.
  • sound screening surface is to be understood to mean an obstacle between two microphones, so that intensityand time-differences are introduced into the sound captured by the microphones from a sound source arranged in an asymmetrical manner relative to the microphones, the microphone arrangement being thus suitable for stereop'honic recording.
  • the stereophonic sound collecting device comprises a body having the sound screening surface constituted by a fiat plate and animaginary line of connection between two stereophonically associated microphones at right angles to the surface of the plate.
  • angular aperture is to be understood to mean herein that part of the recording space which is governed by the artificial head and which is represented linearly between the stereophonically associated loudspeakers during the reproduction, the sound image filling out the space between these loudspeakers wholly or partly.
  • angular aperture it is efficient, as stated hereinbefore for a spherical artificial head, to vary the angular aperture. This is possible with the device according to the invention, since the dimensions of the sound screening surface of the flat plate are variable.
  • This variation may be realized in a simple manner by providing the sound screening plate with a plate-shaped or a disc-shaped part which is slidable or rotatable in the plane of the plate.
  • the axis of rotation of the disc-shaped part may coincide with the imaginary line of connection between two stereophonically associated microphones, so that the microphones can stay at their places with a variation of the sound screening surface.
  • the invention is not restricted to the aforesaid cases, and combinations thereof are, of course, possible.
  • the microphones may be arranged in a manner such that they are displaceable in the direction of their junction line or at right angles thereto.
  • FIG. 1 is a side view of the sound screening plate of the present invention, provided with a rotatable part, which consists of parts of different circular surfaces;
  • FIG. 2 is a side view of the sound screening plate of the present invention having a rotatable part constructed from parts of different elliptical surfaces;
  • FIG. 3 is a side view of the sound screening plate of the present invention having a rotatable part consisting of a body, the periphery of which is bounded by part of a spiral.
  • reference numeral 1 designates the stationary part of the sound screening plate, in the plane of which a flat part is rotatable about the axis 2.
  • This part consists of two semi-circular surfaces 3 and 4 with different radii.
  • a microphone 5 On either side of the plate 1 provision is made of a microphone 5, of which only the one shown in the drawing in front of the plate is indicated in the figures.
  • the angular aperture of the two stereophonically associated microphones 5 will be determined by a point of the periphery of part 4 and will have a high value.
  • the stationary part 1 has such a size relative to the rotatable part that the detour for the sound to be made is so large that it does not contribute to the stereophonic effect.
  • the stationary part of the plate is omitted and the rotatable part consists of two semi-elliptical surfaces 6 and 7 with diiferet axes, this part being rotatable about an axis 8. It is assumed that the imaginary line of connection of the two stereophonically associated microphones coincides with the axis of rotation 8. If the surface 7 serves effectively as that part of the sound screening plate which contributes to stereophonic hearing, the angular aperture of the microphones is adjusted to its higher value. After a rotation through 180, the other conditions being the same, the angular aperture is determined by a point of the periphery of part 6, so that it is adjusted to its lower value.
  • the fiat surface is bounded by part of a spiral.
  • the device will be directed to the sound source along the lines II, 11-11 and IIIIII in the manner indicated by the corresponding arrows in the figures.
  • each of the said microphones may be replaced by a column of microphones, the longitudinal axis of the column being then parallel to the surface of the plate and at rightangles to the lines I-I, IIII and III-III.
  • Stereophonic sound collecting apparatus comprising at least two microphones spatially positioned, an imaginary line of connection between said microphones, and a sound screening surface interposed between said microphones at substantially right angles to said imaginary line connecting said microphones, said surface including a flat 3 plate which is stationary and a movable flat plate with a substantially semi-circular edge portion which is rotatable in a juxtaposed parallel plane of said stationary plate to thereby vary the overall size of said screening surface.
  • Sterecphonic sound collecting apparatus comprising at least two microphones spatially positioned, an imaginary line of connection between said microphones, and a sound screening surface interposed between said microphones at substantially right angles to said imaginary line connecting said microphones, said surface including a plate which is stationary and a movable plate with a substantially semicircular edge portion which is rotatable in a juxtaposed parallel plane of said stationary plate to thereby vary the overall size of said screening surface, said movable plate being rotatably connected to said stationary plate and having an axis of rotation substantially coincident with said imaginary line.
  • Stereophonic sound collecting apparatus comprising at least two microphones spatially positioned, an imaginary line of connection between said microphones, and a sound screening surface interposed between said microphones at substantially right angles to said imaginary line connecting said microphones, said surface including a fiat aomass plate which is stationary and a movable flat plate which is rotatable in a juxtaposed parallel plane of said stationary plate to thereby vary the overall size of said screening surface, said rotatable fiat plate comprising two curved segments of different sizes, said segments being integral.
  • Stereoplionic sound collecting apparatus comprising at least two microphones spatially positioned, an imaginary line of connection between said microphones, and a sound screening surface interposed between said microphones at substantially right angles to said imaginary line connecting said microphones, said surface including a flat plate which is stationary and a movable fiat plate which is rotatable in a juxtaposed parallel plane of said stationary plate to thereby vary the overall size of said screening surface, said rotatable fiat plate having a substantially curved configuration.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic Arrangements (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
US675068A 1956-08-31 1957-07-30 Stereophonic sound collecting device Expired - Lifetime US3070658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN12667A DE1067865B (de) 1956-08-31 1956-08-31 Stereophonische Schallaufnahmeeinrichtung

Publications (1)

Publication Number Publication Date
US3070658A true US3070658A (en) 1962-12-25

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ID=7339616

Family Applications (1)

Application Number Title Priority Date Filing Date
US675068A Expired - Lifetime US3070658A (en) 1956-08-31 1957-07-30 Stereophonic sound collecting device

Country Status (5)

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US (1) US3070658A (en))
DE (1) DE1067865B (en))
FR (1) FR1181800A (en))
GB (1) GB866201A (en))
NL (2) NL220145A (en))

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1572093A (en) * 1976-03-16 1980-07-23 Wehner R Omniphonic transducer system
JPS5957596A (ja) * 1982-09-27 1984-04-03 Sony Corp マイクロホン装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2093540A (en) * 1931-12-14 1937-09-21 Emi Ltd Sound-transmission, sound-recording, and sound-reproducing system
US2520798A (en) * 1940-11-27 1950-08-29 Hartford Nat Bank & Trust Co Device for the stereophonic transmission of sound
US2563010A (en) * 1943-05-17 1951-08-07 Hartford Nat Bank & Trust Co Device for the stereophonic recording of sound vibrations
US2791628A (en) * 1953-06-22 1957-05-07 William R Edmondson Sound device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB394325A (en) * 1931-12-14 1933-06-14 Alan Dower Blumlein Improvements in and relating to sound-transmission, sound-recording and sound-reproducing systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2093540A (en) * 1931-12-14 1937-09-21 Emi Ltd Sound-transmission, sound-recording, and sound-reproducing system
US2520798A (en) * 1940-11-27 1950-08-29 Hartford Nat Bank & Trust Co Device for the stereophonic transmission of sound
US2563010A (en) * 1943-05-17 1951-08-07 Hartford Nat Bank & Trust Co Device for the stereophonic recording of sound vibrations
US2791628A (en) * 1953-06-22 1957-05-07 William R Edmondson Sound device

Also Published As

Publication number Publication date
NL106407C (en)) 1963-10-02
NL220145A (en))
GB866201A (en) 1961-04-26
DE1067865B (de) 1959-10-29
FR1181800A (fr) 1959-06-18

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