US3553374A - Acoustic coupler - Google Patents
Acoustic coupler Download PDFInfo
- Publication number
- US3553374A US3553374A US808979A US3553374DA US3553374A US 3553374 A US3553374 A US 3553374A US 808979 A US808979 A US 808979A US 3553374D A US3553374D A US 3553374DA US 3553374 A US3553374 A US 3553374A
- Authority
- US
- United States
- Prior art keywords
- speaker
- housing
- enclosure
- mouth portion
- exit port
- 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
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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
- H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
- H04M1/215—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers
- H04M1/2155—Acoustic coupling
Definitions
- the mouth portion of the speaker cone is also [51] I H28 directly opposite and axially withdrawn from an eigit port in Field ofSearcli 179/1C, 2C, the enclosure so that there is a passage between the mouth f l8 the speaker cone and the interior of the enclosure.
- the area of the exit port is slightly smaller than the area of the mouth por- [56] References Cited tion of the speaker cone, and the peripheral edge of the exit UNITED STATES PATENTS port is surrounded by a collar of elastomeric material to ,463 11/1954 Robbins et a1- /31(1) acoustically and sealingly engage the transmitter portion of 3, 6 L ll /3l(-l) the telephone handset.
- An acoustic energy absorbing material 3,146,848 9/ 1964 Fundlngsland 18l/3l( .1) such as felt covers the mouth portion of the speaker cone to 3.194.340 7/1965 Kuwayama l provide an acoustic low-pass filter and the walls of the enclo- 2,506,279 5/1950 Rowe l79/2(C) sure to provide high audio frequency damping.
- This invention pertains to the acoustic coupling of tones to a signal transmitter and more particularly to the coupling of tones from a source of binary information represented by shift frequency signals to a communication link.
- a very inexpensive input device comprising a frequency shift keying tone generator which generates audio tones that binarily represent the information to be transmitted.
- a frequency shift keying tone generator which generates audio tones that binarily represent the information to be transmitted.
- a microphone is positioned against the receiver portion of a handset and the received tones are converted to binary information signals.
- Frequency shift representation of information utilizes a first frequency tone to represent a mark and a second frequency tone to represent a space.
- one frequency is typically roughly twice the other frequency.
- the tone abruptly shifts between the frequencies.
- Such abrupt shifts require that the transducer or coupler have excellent transient and frequency response and reasonably good sinusoidal output waveforms.
- there should be a minimum of phase shift and harmonic distortion For example, it should be noted that any second harmonic distortion in the lower frequency tone would tend to look like the higher frequency tone to the handset transmitter.
- a transducer or a coupler should preferably mount the handset in a position such that the harmonic distortion due to microphone granule settling is substantially eliminated.
- the transducer or coupler should be in intimate acoustic contact with the handset transmitter. Ideally, the transducer should be fitted over the transmitter portion of the handset with a minimum of air leakage.
- subscriber telephones use many different varieties of transmitters. For example, the Western Electric Company manufactures at least three types of Granular Carbon Transmitter, i.e.', Types Tl, F1 and T2. Other manufacturers use Fl sizes and shapes of transmitters. Therefore, as a practical matter a coupler must have a universal applicability. Otherwise, a special coupler would be necessary for each type of transmitter.
- the input side of the transmitter i.e., the mouthpiece portion of the handset causes reflections of the acoustic waves back to the coupler. These reflections cause distortions in the acoustic signals emitted by the coupler. While voice communication between human beings can tolerate these distortions, digital communication cannot.
- bass resonant frequency of the loud speaker More particularly, it is highly undesirable to have a loudspeaker construction with a high bass resonant frequency in view of the fact that one frequency in presently used frequency shift keying systems is relatively low.
- Another object of the invention is the provision of a coupler which mounts a handset in such a manner so to substantially eliminate the generation of harmonic distortion and amplitude reduction.
- the invention contemplates a transducer comprising a housing which is provided with an opening.
- a speaker is positioned in the housing.
- the speaker has a speaker cone with a mouth portion positioned in the opening of the housing.
- a member of material which partially absorbs acoustic energy completely covers the mouth portion of the speaker cone to provide an acoustic filter. Accordingly, when the transducer is fitted against the transmitter portion of a telephone handset? good transient and frequency response is obtained.
- FIG. 1 is a front elevational view of an acoustic coupler constructed according to the present invention.
- FIG. 2 is a partial sectional view thereof, taken along the line 24 of FIG. 1.
- the coupler 10 includes an enclosure 11 having a bottom wall 12, rear wall 13, opposed sidewalls l5 and 17, a top wall 21, and a front wall 19 which is provided with two exit ports 14 and 16.
- Surrounding exit ports 14 and 16 are collars l8 and 20, respectively.
- the collars are made of an elastomer such as soft rubber to assist in proper positioning of the many differently sized handsets to the coupler and to minimize leakage of ambient sounds in the system.
- a member in the form of disc 22 completely covers exit port 16.
- the member 22 may be made of felt or some other rnateri al having soundabsorbent characteristics. This member serves to eliminate standing waves between a speaker or an output transducer 28 and the hard plastic cover of the telephone handsets transmitter. Additionally, the member 22 functions as an acoustical low-pass filter thereby to eliminate most of the undesirable higher frequency harmonics.
- Bushinglike spacers 26A and 268 support output transducer 28 in spaced relationship to the wall of the enclosure 11.
- bushinglike spacers 26C and 26D support input transducer 30 in spaced relationship to the wall of enclosure 11. The spacing is best seen with respect to transducer 30.
- the output transducer 28 includes the cup shaped housing 32 of a dense, rigid material such as aluminum. Within the housing 32 are a felt base disc 34, and a plurality of felt washers 36A36C. Fitted in the housing and cushioned by the disc 34 and washers 36 is a speaker 38 including a permanent magnet 38A, a speaker cone 38C and a voice coil (not shown) which is energized by leads 38.
- the speaker cone 38C is in the open end of housing 32 and the mouth of speaker cone 38 faces exit port 16.
- the flange 38E of speaker cone 38C is supported between felt washer 40 and spacers 26A, 26B. Screws (not shown) start from the wall of enclosure 11, pass through spacers 26A, 26B flange 38E and washer 40 and terminate in threaded openings in the wall of housing 32.
- housing 32 is completely sealed to prevent the escape of any acoustic backwaves.
- spacers 26A, 268 there is an air passageway between the mouth of speaker cone 38C and the interior of enclosure 11 which is lined with sound-absorbing material 42. Such a passageway makes the coupling between the speaker and the handset transmitter equivalent to a transformer with a low k. Thus, the coupling is improved and the low frequency response is controlled.
- the bass frequency response of the transducer increases with decreasing volume.
- the area of the exit port 16 is made to be slightly smaller than the area of the mouth of the speaker cone. 38C.
- the I sound-absorbent material 42 which may be felt or the like, serves to dampen or eliminate standing waves in the higher audio frequency-range while having little effect on the lower frequencies. That is, all the material lies within a small fraction of a wavelength of the inner wall, which is effecting a velocity node, so there is no motion of the air particles at the boundary of the acoustical material.
- the combination acts as an acoustic coupler having a controlled passband.
- the input transducer portion is similar to the above described output transducer portion except that a further felt washer 44 is provided to minimize acoustic communication from the mouth of the speaker cone and the interior of enclosure 12.
- the coupler l0 mounts the microphone of a handset in a vertical position rather than the conventional horizontal position thereby to substantially reduce the generation of harmonic distortion and minimize amplitude reduction which would otherwise arise if the handset were oriented in the horizontal position for long periods of time.
- second harmonic distortion of signals is substantially eliminated when the handset is placed with the microphone or transmitter in a vertical position rather than a horizontal position. Accordingly, when the coupler of the present invention is utilized in the manner described above, with the bottom-wall 12 resting on a supporting surface, the handset will be positioned on edge. Hence, the microphone will be oriented in a vertical plane to reduce the aforementioned distortion.
- a transducer for use with a telephone handset and the like comprising a housing, said housing being provided with an opening, a speaker positioned in said housing, said speaker ineluding a speaker cone with a mouth portion positioned in the opening of said housing, and a low-pass filter means com letely covering the mouth portion of said speaker cone, sai lowpass filter means comprising a felt disc, said transducer further including sealing means for sealing said speaker in said housing so that only the mouth portion of said speaker cone can communicate with the region external to said housing, an enclosure provided with an exitport enclosing said housing and said speaker with the mouth portion of said speaker cone directly opposite the exit port, said sealing means including spacing means for supporting said speaker so that the mouth portion of the speaker cone is within said enclosure and axially withdrawn from said exit port, and a passage between the mouth of the speaker and the interior of the enclosure to control low frequency response of said speaker.
- sealing means further includes a washer of acoustically-absorbing material between said housing and said speaker cone.
- a transducer for coupling tones to the transmitter portion of a telephone handset comprising a housing provided with an opening, a speaker including a speaker cone having a mouth portion, said speaker being disposed in said housing with the mouth portion of said speaker cone being disposed in said opening, means for tightly sealing said speaker in said housing so that only the mouth portion of said speaker cone can communicate with the region external to said housing, an enclosure provided with an exit port, said housing and said speaker being disposed in said enclosure with the mouth portion of said speaker cone directly opposite the exit port, and a collar of elastomeric material around the peripheral edge of the exit port for acoustically sealingly engaging the transmitter portion of the telephone handset, the area of said exit port being slightly smaller than the area of the mouth of said speaker, said transducer further including means for supporting said housing and said speaker so that the mouth portion of the speaker cone is within said enclosure and axially withdrawn from the exit port, and a passage between the mouth of the speaker and the interior of the enclosure to control low frequency response of said speaker.
- a transducer for coupling tones to the transmitter portion of a telephone handset comprising a housing provided with an opening, a speaker including a speaker cone having a mouth portion, said speaker being disposed in said housing with the mouth portion of 'said speaker cone being disposed in said opening, means for sealing said speaker in said housing so that only the mouth portion of said speaker cone can communicate with the region external to said housing, and enclosure provided with an exit port, said housing and said speaker being disposed in said enclosure with the mouth portion of said speaker cone directly opposite the exit port, a member of material which partially absorbs acoustic energy completely covering said exit port to provide and acoustic filter, a collar of elastomeric material around the peripheral edge of the exit port for acoustically sealingly engaging the transmitter portion of the telephone handset, means for supporting said housing and said speaker so that the mouth portion of the speaker cone is within said enclosure and axially withdrawn from the exit port and the face of said housing is spaced from the interior side of the wall defining said exit port, and acoustic
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Abstract
Description
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US80897969A | 1969-03-20 | 1969-03-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3553374A true US3553374A (en) | 1971-01-05 |
Family
ID=25200257
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US808979A Expired - Lifetime US3553374A (en) | 1969-03-20 | 1969-03-20 | Acoustic coupler |
Country Status (1)
Country | Link |
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US (1) | US3553374A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3725584A (en) * | 1970-12-30 | 1973-04-03 | Ibm | Acoustic coupler |
US3733437A (en) * | 1970-05-20 | 1973-05-15 | Anderson Jacobson Inc | Telephone handset coupler |
DE2753387A1 (en) * | 1977-11-30 | 1979-05-31 | Anderson Jacobson Inc | Acoustic coupler for telephone handsets - has moulded plastics cups with adjustment facility and lip bearing against microphone or speaker casing |
US4158106A (en) * | 1977-12-05 | 1979-06-12 | Anderson Jacobson, Inc. | Telephone handset acoustic coupling cup |
WO1981000656A1 (en) * | 1979-08-31 | 1981-03-05 | Electro Med Eng Pty Ltd | Acoustic coupler cavity lineariser |
DE4020588A1 (en) * | 1989-06-29 | 1991-01-10 | Ricoh Kk | ACOUSTIC COUPLER AND DATA TRANSFER DEVICE WITH ACOUSTIC COUPLER |
AU609395B2 (en) * | 1986-05-22 | 1991-05-02 | Pascom Pty. Ltd. | Electroacoustic transducer device |
US5291541A (en) * | 1992-12-21 | 1994-03-01 | At&T Bell Laboratories | Coupling apparatus for telephone handsets |
US5701354A (en) * | 1994-10-12 | 1997-12-23 | Nec Corporation | Telephone mouthpiece for preventing wind noises and method for reducing wind noises input thereto |
US6052812A (en) * | 1998-01-07 | 2000-04-18 | Pocketscience, Inc. | Messaging communication protocol |
US6084952A (en) * | 1996-01-18 | 2000-07-04 | Pocketscience, Inc. | System and method for communicating electronic messages over a telephone network using acoustical coupling |
WO2002063790A1 (en) * | 2001-02-07 | 2002-08-15 | Michael Davis | Communications interface device |
US20020152314A1 (en) * | 2001-04-06 | 2002-10-17 | Hayek Georges Nicolas | Method and system for accessing information and/or data available on a wide area computer network |
US20200052799A1 (en) * | 2018-08-09 | 2020-02-13 | Onesubsea Ip Uk Limited | Subsea telecommunication system |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2506279A (en) * | 1947-05-03 | 1950-05-02 | Harry C Rowe | Sound actuated signal device for telephones |
US2529228A (en) * | 1947-04-26 | 1950-11-07 | Zenith Radio Corp | Damper for hearing aids |
US2694463A (en) * | 1952-04-07 | 1954-11-16 | Robbins Frank | Acoustic system for loud-speakers |
US3116376A (en) * | 1962-03-28 | 1963-12-31 | Maico Electronics Inc | Acoustical device |
US3135349A (en) * | 1962-04-02 | 1964-06-02 | Uolevi L Lahti | Loudspeaker |
US3146848A (en) * | 1958-08-25 | 1964-09-01 | John O Fundingsland | Hi-fidelity speaker |
US3194340A (en) * | 1964-05-15 | 1965-07-13 | Kuwayama Zennosuke | Speaker enclosure system |
US3299207A (en) * | 1963-08-29 | 1967-01-17 | Cooke Robert James | Sound reproducer with means for attachment to a telephone handpiece |
US3319003A (en) * | 1967-05-09 | Automatic adapter unit for telephone instruments | ||
US3360071A (en) * | 1965-08-02 | 1967-12-26 | Chromalloy Corp | Acoustical coupler |
-
1969
- 1969-03-20 US US808979A patent/US3553374A/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3319003A (en) * | 1967-05-09 | Automatic adapter unit for telephone instruments | ||
US2529228A (en) * | 1947-04-26 | 1950-11-07 | Zenith Radio Corp | Damper for hearing aids |
US2506279A (en) * | 1947-05-03 | 1950-05-02 | Harry C Rowe | Sound actuated signal device for telephones |
US2694463A (en) * | 1952-04-07 | 1954-11-16 | Robbins Frank | Acoustic system for loud-speakers |
US3146848A (en) * | 1958-08-25 | 1964-09-01 | John O Fundingsland | Hi-fidelity speaker |
US3116376A (en) * | 1962-03-28 | 1963-12-31 | Maico Electronics Inc | Acoustical device |
US3135349A (en) * | 1962-04-02 | 1964-06-02 | Uolevi L Lahti | Loudspeaker |
US3299207A (en) * | 1963-08-29 | 1967-01-17 | Cooke Robert James | Sound reproducer with means for attachment to a telephone handpiece |
US3194340A (en) * | 1964-05-15 | 1965-07-13 | Kuwayama Zennosuke | Speaker enclosure system |
US3360071A (en) * | 1965-08-02 | 1967-12-26 | Chromalloy Corp | Acoustical coupler |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3733437A (en) * | 1970-05-20 | 1973-05-15 | Anderson Jacobson Inc | Telephone handset coupler |
US3725584A (en) * | 1970-12-30 | 1973-04-03 | Ibm | Acoustic coupler |
DE2753387A1 (en) * | 1977-11-30 | 1979-05-31 | Anderson Jacobson Inc | Acoustic coupler for telephone handsets - has moulded plastics cups with adjustment facility and lip bearing against microphone or speaker casing |
US4158106A (en) * | 1977-12-05 | 1979-06-12 | Anderson Jacobson, Inc. | Telephone handset acoustic coupling cup |
WO1981000656A1 (en) * | 1979-08-31 | 1981-03-05 | Electro Med Eng Pty Ltd | Acoustic coupler cavity lineariser |
AU609395B2 (en) * | 1986-05-22 | 1991-05-02 | Pascom Pty. Ltd. | Electroacoustic transducer device |
DE4020588A1 (en) * | 1989-06-29 | 1991-01-10 | Ricoh Kk | ACOUSTIC COUPLER AND DATA TRANSFER DEVICE WITH ACOUSTIC COUPLER |
US5063590A (en) * | 1989-06-29 | 1991-11-05 | Ricoh Company, Ltd. | Acoustic coupler and data transmission apparatus using the same |
US5291541A (en) * | 1992-12-21 | 1994-03-01 | At&T Bell Laboratories | Coupling apparatus for telephone handsets |
US5701354A (en) * | 1994-10-12 | 1997-12-23 | Nec Corporation | Telephone mouthpiece for preventing wind noises and method for reducing wind noises input thereto |
US6084952A (en) * | 1996-01-18 | 2000-07-04 | Pocketscience, Inc. | System and method for communicating electronic messages over a telephone network using acoustical coupling |
US6052812A (en) * | 1998-01-07 | 2000-04-18 | Pocketscience, Inc. | Messaging communication protocol |
US6301681B1 (en) | 1998-01-07 | 2001-10-09 | Pocketmail Inc. | Messaging communication protocol |
WO2002063790A1 (en) * | 2001-02-07 | 2002-08-15 | Michael Davis | Communications interface device |
US20050020257A1 (en) * | 2001-02-07 | 2005-01-27 | Michael Davis | Communications interface device |
US20020152314A1 (en) * | 2001-04-06 | 2002-10-17 | Hayek Georges Nicolas | Method and system for accessing information and/or data available on a wide area computer network |
US7328236B2 (en) * | 2001-04-06 | 2008-02-05 | Swatch Ag | Method and system for accessing information and/or data available on a wide area computer network |
US20080183716A1 (en) * | 2001-04-06 | 2008-07-31 | Swatch Ag | Method and system for accessing information and/or data available on a wide area computer network |
US7853641B2 (en) | 2001-04-06 | 2010-12-14 | Swatch Ag | Method and system for accessing information and/or data available on a wide area computer network |
US20200052799A1 (en) * | 2018-08-09 | 2020-02-13 | Onesubsea Ip Uk Limited | Subsea telecommunication system |
US11990948B2 (en) * | 2018-08-09 | 2024-05-21 | Onesubsea Ip Uk Limited | Subsea telecommunication system |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: NORTHERN TELECOM INC., STATELESS Free format text: CERTIFIED COPY OF MERGER FILED IN THE OFFICE OF THE SECRETARY OF STATE OF DELAWARE, SHOWING MERGER OF ASSIGNORS AND CHANGE OF NAME OF THE SURVIVING CORPORATION ON DEC. 17, 1980, EFFECTIVE DEC. 31, 1980;ASSIGNOR:NORTHERN TELECOM SYSTEMS CORPORATIO A CORP. OF MN. (MERGED INTO);REEL/FRAME:004006/0661 Effective date: 19800918 Owner name: DATA 100 CORPORATION, STATELESS Free format text: CERTIFIED COPY OF A CERTIFICATE FILED IN THE OFFICE OF THE SECRETARY OF STATE OF MINNESOTA, SHOWING MERGER OF ASSIGNORS AND CHANGE OF NAME OF THE SURVIVING CORPORATION ON MAY 30, 1979 EFFECTIVE AY 31, 179,;ASSIGNOR:NORTHERN TELECOM COMPUTERS, INC., A CORP. OF DE.;REEL/FRAME:004006/0654 Effective date: 19871212 Owner name: NORTHERN TELECOM INC. (CHANGED INTO) Free format text: CERTIFIED COPY OF MERGER FILED IN THE OFFICE OF THE SECRETARY OF STATE OF DELAWARE, SHOWING MERGER OF ASSIGNORS AND CHANGE OF NAME OF THE SURVIVING CORPORATION ON DEC. 17, 1980, EFFECTIVE DEC. 31, 1980;ASSIGNOR:NORTHERN TELECOM SYSTEMS CORPORATIO A CORP. OF MN. (MERGED INTO);REEL/FRAME:004006/0661 Effective date: 19800918 Owner name: DATA 100 CORPORATION, A MN. CORP. (CHANGED INTO) Free format text: CERTIFIED COPY OF A CERTIFICATE FILED IN THE OFFICE OF THE SECRETARY OF STATE OF MINNESOTA, SHOWING MERGER OF ASSIGNORS AND CHANGE OF NAME OF THE SURVIVING CORPORATION ON MAY 30, 1979 EFFECTIVE AY 31, 179,;ASSIGNORS:NORTHERN TELECOM COMPUTERS, INC., A CORP. OF DE.;SYCOR, INC. A CORP. OF DE. (MERGED INTO);REEL/FRAME:004006/0654;SIGNING DATES FROM |
|
AS | Assignment |
Owner name: DATA 100 CORPORATION, A MN CORP., STATELESS Free format text: ASSIGNS NUNC PRO TUNC AS OF DECEMBER 31, 1977 THE ENTIRE INTEREST IN SAID PATENTS;ASSIGNOR:IOMEC, INC., A CORP. OF DE;REEL/FRAME:004064/0072 Effective date: 19820902 Owner name: DATA 100 CORPORATION, A MN CORP. Free format text: ASSIGNS NUNC PRO TUNC AS OF DECEMBER 31, 1977 THE ENTIRE INTEREST IN SAID PATENTS.;ASSIGNOR:IOMEC, INC., A CORP. OF DE;REEL/FRAME:004064/0072 Effective date: 19820902 |