GB774003A - Improvements in or relating to pressure gradient microphones - Google Patents
Improvements in or relating to pressure gradient microphonesInfo
- Publication number
- GB774003A GB774003A GB25298/54A GB2529854A GB774003A GB 774003 A GB774003 A GB 774003A GB 25298/54 A GB25298/54 A GB 25298/54A GB 2529854 A GB2529854 A GB 2529854A GB 774003 A GB774003 A GB 774003A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- microphone
- frequency
- pressure gradient
- passages
- 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
Links
Classifications
-
- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
- H04R1/38—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
774,003. Microphones. ELECTRO-VOICE, Inc. Aug. 31, 1954 [Jan. 11, 1954], No. 25298/54. Class 40 (4). In a pressure gradient microphone having a chamber 19, Fig. 1, immediately adjacent one side of the diaphragm 12, the effective distance between the two sides of the diaphragm is made to vary inversely as the sound frequency by providing two indepenent passages 18, 23 from the exterior of the housing to the chamber which are of different length and admit primarily different portions of the frequency spectrum. Passages 18 and 23 deal with high and low frequencies respectively and the output is substantially constant at all frequencies. A chamber 26 provides a terminating impedance for the low-frequency passage. Casing 16, Fig. 10, has an enlarged upper portion 31 covered by a windscreen 35 which is held by a screw 34 in a three-legged spider 33 and the magnetic circuit 6 includes two or more permanent magnets 36. The high-frequency passage 17 is covered by a grill 37 and a microphone transformer 42 is included within the casing. The performance of the microphone is described with reference to vector diagrams, Figs. 3-9 (not shown), and an electrical analogue, Fig. 2 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US403099A US3115207A (en) | 1954-01-11 | 1954-01-11 | Unidirectional microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB774003A true GB774003A (en) | 1957-05-01 |
Family
ID=23594464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25298/54A Expired GB774003A (en) | 1954-01-11 | 1954-08-31 | Improvements in or relating to pressure gradient microphones |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3115207A (en) |
| GB (1) | GB774003A (en) |
| NL (2) | NL102054C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1096420B (en) * | 1958-12-24 | 1961-01-05 | Sennheiser Electronic | Electroacoustic directional converter |
| US3095484A (en) * | 1959-10-22 | 1963-06-25 | Electro Voice | Unidirectional microphone |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3378649A (en) * | 1964-09-04 | 1968-04-16 | Electro Voice | Pressure gradient directional microphone |
| AT251668B (en) * | 1964-10-16 | 1967-01-10 | Akg Akustische Kino Geraete | Electroacoustic converter |
| NL6604150A (en) * | 1966-03-30 | 1967-10-02 | ||
| US4410770A (en) * | 1981-06-08 | 1983-10-18 | Electro-Voice, Incorporated | Directional microphone |
| ATA74486A (en) * | 1986-03-20 | 1987-04-15 | Akg Akustische Kino Geraete | DIRECTIONAL MICROPHONE ACCORDING TO THE ELECTROSTATIC OR ELECTRODYNAMIC CONVERTER PRINCIPLE |
| US5070530A (en) * | 1987-04-01 | 1991-12-03 | Grodinsky Robert M | Electroacoustic transducers with increased magnetic stability for distortion reduction |
| US8818009B2 (en) * | 2012-10-23 | 2014-08-26 | Shure Acquisition Holdings, Inc. | Dual diaphragm dynamic microphone transducer |
| JP2018148435A (en) * | 2017-03-07 | 2018-09-20 | 株式会社オーディオテクニカ | Electro-acoustic transducer, manufacturing method of electro-acoustic transducer, and electro-acoustic conversion device |
| US11134337B2 (en) | 2019-11-18 | 2021-09-28 | Bose Corporation | Variable port microphone |
| US11418873B2 (en) | 2020-11-03 | 2022-08-16 | Edward J. Simon | Surveillance microphone |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2216961A (en) * | 1937-09-30 | 1940-10-08 | Rca Corp | Sound translating apparatus |
| US2252846A (en) * | 1938-09-30 | 1941-08-19 | Associated Electric Lab Inc | Acoustic device |
| NL72895C (en) * | 1943-01-16 | |||
| NL67077C (en) * | 1945-12-03 | |||
| DE1073545B (en) * | 1953-06-02 | 1960-01-21 | Akustische u Kino Gerate Ges mbH, Wien | Dynamic directional microphone |
-
0
- NL NL190970D patent/NL190970A/xx unknown
- NL NL102054D patent/NL102054C/xx active
-
1954
- 1954-01-11 US US403099A patent/US3115207A/en not_active Expired - Lifetime
- 1954-08-31 GB GB25298/54A patent/GB774003A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1096420B (en) * | 1958-12-24 | 1961-01-05 | Sennheiser Electronic | Electroacoustic directional converter |
| US3095484A (en) * | 1959-10-22 | 1963-06-25 | Electro Voice | Unidirectional microphone |
Also Published As
| Publication number | Publication date |
|---|---|
| US3115207A (en) | 1963-12-24 |
| NL190970A (en) | |
| NL102054C (en) |
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