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US2670054A - Voice muffler - Google Patents

Voice muffler Download PDF

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Publication number
US2670054A
US2670054A US175102A US17510250A US2670054A US 2670054 A US2670054 A US 2670054A US 175102 A US175102 A US 175102A US 17510250 A US17510250 A US 17510250A US 2670054 A US2670054 A US 2670054A
Authority
US
United States
Prior art keywords
casing
sound
duct
entrance
voice
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
US175102A
Other languages
English (en)
Inventor
Harry C Tuttle
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
Priority to US175102A priority Critical patent/US2670054A/en
Application granted granted Critical
Publication of US2670054A publication Critical patent/US2670054A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor

Definitions

  • the present invention relates to a voice muflier, and more particularly to a voice muffler for a telephone transmitter.
  • the design of the present invention above referred to as respects filtering low frequencies and minimizing the air blast is essential to this end.
  • Another object of this invention is to accomplish the muiing of the voice while at the same time preserving the naturalness and identifying quality of the speakers voice.
  • the present invention comprises in its broadest aspects a casing, a highly sound-absorbent entrance wall arranged at one end of the casing and having an entrance aperture, means for attaching the casing to a telephone transmitter with the entrance wall at least partly in the path of at least part of the sound waves to be transmitted by the telephone transmitter, a sound duct arranged in the casing and leading from a location n ear the entrance wall to the rear end of the casing, and a sound-absorbent material arranged in the casing soy as to fill part of the same and to surround a portion of the duct.
  • a wire mesh is arranged at the outer side of the casing and covers at least part of the entrance wall and the aperture.
  • an opening is arranged in the rear portion of said casing and the duct leads to a location near the opening.
  • the duct subdivides the interior of the casing into a lower part and an upper part containing the entrance wall.
  • the sound-absorbent material includes a first portion and a second portion, the rst portion being arranged in the lower part of the casing and iilling the same except a lower portion in the rear end of the casing, the second portion being arranged in the upper part of the casing and filling the same except an upper portion in the rear end of the casing and preferably a portion arranged between the duct and the entrance wall, the rst portion and the second portion of the sound-absorbent material merging into each other so as to surround the middle portion of the duct.
  • Fig. i is a sectional elevation of a voice muflicr according to the present invention.
  • Figs. 2, 3 and 4 are cross-sections taken, respectively, along the lines 2-2, 3--3 and 4--4 of Fig. l.
  • the voice muer comprises a casing I0 having at one end thereof an entrance Wall I2 consisting of a highly sound-absorbent material such as cotton, wool, glass wool, fiber glass or the like.
  • the entrance wall I 2 is provided with an entrance aperture I4 arranged approximately at the center of the entrance wall I2.
  • a wire mesh IB is arranged at the outer side of the casing I0 and covers at least part of the entrance wall I2 and the entrance aperture I4, so as to support the material of the entrance wall.
  • the front part I8 of the casing carries an extension 20 which is provided with an aperture in a vertical side wall 22 there- 4of for attaching the telephone transmitter 24 to the casing I0.
  • the extension 20 is provided with an aperture 26 the edges of which are curved so as to form a member 28 fitting the mouth of a person using the muiiier.
  • the extension 20 forms a chamber of substantially triangular cross-section as shown in Fig. l.
  • the entrance wall I2 is at least partly in the path of at least part of the sound waves to be transmitted by the telephone transmitter.
  • a sound duct 3Q is arranged in the interior of the casing i so as to subdivide the same into a lower part 32 and an upper part 3 containing the entrance wall l2.
  • the duct 30 leads from a location near the entrance wall l2 to the rear end 35 of the casing which is subdivided by the duct 3&3 into a lower portion 3B and an upper portion lid.
  • the upper portion 40 is provided with an opening d2 forming a connection of the interior of the casing i@ with the atmosphere.
  • the duct 3) is preferably constituted by a lower I wire mesh Il@ and an upper wire mesh 46 which extend substantially through the entire width of the casing lil and are connected at the mid portion of the sides thereof by narrow pieces 48 and 50 (Fig. 2) of felt or the like.
  • a sound-absorbent material such as cotton, wool, glass wool, ber glass or the like is arranged "in the casing Eil andincludes .a Aiirst portion 52 anda second portion 513.
  • the lower portion 52 is arranged in the lower part 32 of the casing l and fills the same entirely except the lower portion 38 in the rear end of the casing l0'.
  • the second portion 54 is arranged in the upper part 34 of the casing i i? and ills the same except the upper portion 4i) in the rear end of the casing i0 and -a portion arranged between the duct 30 and 'the entrance wall i2.
  • Thev portion 56 has a tapering cross-section having its greatest width at the front portion i8 of the casing ill.
  • the rst portion 52 and the second portion 54 of the soundabsorbent material merge into each other as shown in Fig. 2 inthe middle portion of the duct 30 so as to surround the same.
  • the operation of this device is yas follows:
  • the casing iii is attached toa telephone transmitter as indicated in Fig. 1 and the person who 'wishes to use the telephone speaks into the opening 25.
  • the sound waves coming from the mouth of the person using the device hit partly the highly sound-absorbent entrance wall l2 of the casing and part of the sound waves enter through "the entrance opening i4 and reach the portion 58 of a chamber 56 inside the casing I ii, from rwhere they enter the duct 3B leading to the rear 'portion 35 of the casing Iii.
  • the sound Waves entering the duct 3U are attenuated by the sound- ;absorbent material 52, 5d, and are then discharged into a chamber arranged in the rear portion 3B of the casing ill which is in communication with the atmosphere through the opening 42.
  • a voice mufer for a telephone transmitter comprising in combination, a casing; a highly sound-absorbent and sound-permeable entrance layer of free iibrous material arranged at one end of said casing and having an entrance aperture; a Wire mesh arranged at the outer side of said casing and covering at least part of said entrance layer and said aperture; means for attaching said casing to a telephone transmitter with said entrance layer at least partly in the path of at least part of the sound waves to be transmitted by the telephone transmitter; a sound duct arranged in said casing and leading from a location near said entrance layer to the rear end of said casing; a sound-absorbent material arranged in said casing so as to ll part of the same and to surround the middle portion of said duct; and a chamber arranged in the rear end of said casing, said chamber forming an empty space surrounding said duct and having an opening connecting said empty space to the atmosphere whereby sound waves transmitted through said duct enter
  • a voice muwriterr for a telephone transmitter comprising in combination, a casing; a highly sound-absorbent and sound-permeable entrance layer of free brous material arranged at one end of said casing and having an entrance aperture; means for attaching said casing to a telephone transmitter with said entrance layer at least partly in the path of at least part of the sound Waves to be transmitted by the telephone transmitter; an opening arranged in the rear portion of said casing; a sound duct arranged in said casing and leading from a location near said entrance layer to a location near said opening arranged in the rear portion of said casing; a sound-absorbent material arranged in said casing so as to ll part of the same and to surround the middle portion of said duct; and a chamber ,arranged in the rear end of said casing and vforming an empty space surrounding said duct, said empty space being connected by said opening to the atmosphere whereby sound waves transmitted through said duct enter said empty space from which they are discharged in attenuated form through said opening into the atmosphere.
  • a voice muwriterr for a telephone transmitter comprising in combination, a casing; a highly sound-absorbent and sound-permeable entrance layer of free iibrous material arranged at one end of said casing and having an entrance aperture; a wire mesh arranged at the outer side of said casing and covering at least part of said entrance layer and said aperture; means for attaching said casing to a telephone transmitter with said entrance layer at least partly in the path ofatleast part of the sound waves to be Fl'aSmted by the telephone transmitter;
  • a sound duct arranged in said casing so as to subdivide the interior of the same into a lower part and an upper part containing said entrance layer, said duct leading from a 1ocation near said entrance layer to the rear end of said easing; and a sound-absorbent material including a first portion and a second portion, said rst portion being arranged in said lower part oi said casing and iling the same except a lower portion in the rear end of said casing, said second portion being arranged in said upper part of said casing and lling the same except an upper portion in the rear end of said casing containing said opening, said iirst portion and said second portion of said sound-absorbent material merging into each other so as to surround the middle portion of said duct, said lower and upper 6 portions forming a chamber free of soundabsorbent material and having an opening communicating with the atmosphere, whereby sound waves transmitted through said duct enter said chamber from which they are discharged in at

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Building Environments (AREA)
  • Exhaust Silencers (AREA)
US175102A 1950-07-21 1950-07-21 Voice muffler Expired - Lifetime US2670054A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US175102A US2670054A (en) 1950-07-21 1950-07-21 Voice muffler

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US175102A US2670054A (en) 1950-07-21 1950-07-21 Voice muffler
GB28710/53A GB737635A (en) 1953-10-17 1953-10-17 Improvements in or relating to voice mufflers for telephone transmitters

Publications (1)

Publication Number Publication Date
US2670054A true US2670054A (en) 1954-02-23

Family

ID=10279859

Family Applications (1)

Application Number Title Priority Date Filing Date
US175102A Expired - Lifetime US2670054A (en) 1950-07-21 1950-07-21 Voice muffler

Country Status (5)

Country Link
US (1) US2670054A (de)
CH (1) CH322826A (de)
DE (1) DE1000868B (de)
FR (1) FR1093466A (de)
GB (1) GB737635A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798122A (en) * 1953-10-02 1957-07-02 Ungarsohn Harry Voice reporting apparatus and the like
US2846527A (en) * 1954-12-13 1958-08-05 Johnson Hartmann Telephone mouthpiece voice silencer
US20220247852A1 (en) * 2019-09-11 2022-08-04 mutum GmbH Limiting Sound Emissions in Speech Detection Arrangements

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2131820A (en) * 1937-02-15 1938-10-04 Louis S Scher Telephone voice silencer
US2245724A (en) * 1940-05-21 1941-06-17 Louis S Scher Voice silencer
US2478783A (en) * 1946-06-17 1949-08-09 Louis S Scher Telephone mouthpiece voice silencer with plural silencing chambers
US2508581A (en) * 1946-02-18 1950-05-23 Us Office Of Scient Res And De Noise shield for microphones
US2566975A (en) * 1947-01-18 1951-09-04 Leo L Beranek Voice silencer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2131820A (en) * 1937-02-15 1938-10-04 Louis S Scher Telephone voice silencer
US2245724A (en) * 1940-05-21 1941-06-17 Louis S Scher Voice silencer
US2508581A (en) * 1946-02-18 1950-05-23 Us Office Of Scient Res And De Noise shield for microphones
US2478783A (en) * 1946-06-17 1949-08-09 Louis S Scher Telephone mouthpiece voice silencer with plural silencing chambers
US2566975A (en) * 1947-01-18 1951-09-04 Leo L Beranek Voice silencer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798122A (en) * 1953-10-02 1957-07-02 Ungarsohn Harry Voice reporting apparatus and the like
US2846527A (en) * 1954-12-13 1958-08-05 Johnson Hartmann Telephone mouthpiece voice silencer
US20220247852A1 (en) * 2019-09-11 2022-08-04 mutum GmbH Limiting Sound Emissions in Speech Detection Arrangements
US11831797B2 (en) * 2019-09-11 2023-11-28 mutum GmbH Limiting sound emissions in speech detection arrangements

Also Published As

Publication number Publication date
CH322826A (de) 1957-06-30
DE1000868B (de) 1957-01-17
FR1093466A (fr) 1955-05-05
GB737635A (en) 1955-09-28

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