NL43957C - - Google Patents

Info

Publication number: NL43957C
Authority: NL; Netherlands

Application number

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.)

1934-12-29

Publication of NL43957C publication Critical patent/NL43957C/xx

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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
- 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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- 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)

NL43957D 1934-12-29 NL43957C (xx)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US759679A US2126566A (en)	1934-12-29	1934-12-29	Acoustic device

Publications (1)

Publication Number	Publication Date
NL43957C true NL43957C (xx)

Family

ID=25056553

Family Applications (2)

Application Number	Title	Priority Date	Filing Date
NL43957D NL43957C (xx)	1934-12-29
NL45821D NL45821C (xx)	1934-12-29

Family Applications After (1)

Application Number	Title	Priority Date	Filing Date
NL45821D NL45821C (xx)	1934-12-29

Country Status (5)

Country	Link
US (1)	US2126566A (xx)
BE (1)	BE412830A (xx)
FR (1)	FR799518A (xx)
GB (1)	GB464996A (xx)
NL (2)	NL45821C (xx)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB552328A (en) *	1941-12-04	1943-04-01	Reslo Sound Equipment Ltd	Improvements in or relating to loud speakers and the like
US2515031A (en) *	1948-03-31	1950-07-11	Bell Telephone Labor Inc	Microphone having controllable directional response pattern
US2702318A (en) *	1951-01-10	1955-02-15	Astatic Corp	Unidirectional microphone
DE1073545B (de) *	1953-06-02	1960-01-21	Akustische u Kino Gerate Ges mbH, Wien	Dynamisches Rieht mikrophon
US3342285A (en) *	1966-12-19	1967-09-19	Standard Systems Comm Corp	Combination pillow speaker and control unit
GB2168875A (en) *	1984-12-19	1986-06-25	Philips Electronic Associated	Electroacoustic calling device

0
- NL NL43957D patent/NL43957C/xx active
- NL NL45821D patent/NL45821C/xx active
- BE BE412830D patent/BE412830A/xx unknown
1934
- 1934-12-29 US US759679A patent/US2126566A/en not_active Expired - Lifetime
1935
- 1935-11-15 GB GB31677/35A patent/GB464996A/en not_active Expired
- 1935-12-14 FR FR799518D patent/FR799518A/fr not_active Expired

Also Published As

Publication number	Publication date
BE412830A (xx)
FR799518A (fr)	1936-06-15
NL45821C (xx)
US2126566A (en)	1938-08-09
GB464996A (en)	1937-04-29

Publication	Publication Date	Title
NL44156C (xx)	1938-05-16
FR767583A (xx)	1934-07-19
FR767796A (xx)	1934-07-23
FR767721A (xx)	1934-07-23
FR766669A (xx)	1934-06-29
FR766607A (xx)	1934-06-29
BE402225A (xx)
NL40912C (xx)
BE402894A (xx)
BE402837A (xx)
BE402820A (xx)
BE402716A (xx)	1934-05-31
BE402710A (xx)	1934-05-31
BE402683A (xx)
BE401891A (xx)
BE402626A (xx)
BE402584A (xx)	1934-05-31
BE402553A (xx)
BE402503A (xx)	1934-08-31
BE402442A (xx)	1934-05-31
BE402391A (xx)	1934-05-31
BE402346A (xx)
BE402339A (xx)	1934-04-30
NL74887C (xx)
BE403335A (xx)