GB934632A - Improvements in or relating to apparatus for transmitting acoustic vibrations provided with a variable acoustic impedance - Google Patents

Improvements in or relating to apparatus for transmitting acoustic vibrations provided with a variable acoustic impedance

Info

Publication number
GB934632A
GB934632A GB4278159A GB4278159A GB934632A GB 934632 A GB934632 A GB 934632A GB 4278159 A GB4278159 A GB 4278159A GB 4278159 A GB4278159 A GB 4278159A GB 934632 A GB934632 A GB 934632A
Authority
GB
United Kingdom
Prior art keywords
relating
variable
vibrations provided
transmitting
spring
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
Application number
GB4278159A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB934632A publication Critical patent/GB934632A/en
Expired legal-status Critical Current

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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Springs (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Telephone Set Structure (AREA)

Abstract

934,632. Telephone instruments. PHILIPS ELECTRICAL INDUSTRIES Ltd. Dec. 16, 1959 [Dec. 19, 1958]. No. 42781/59. Class 40(4). [Also in Group XL (b)] A helical spring 1 terminated by a plate 4 or a Helmholtz resonator 5 is used as a mouthpiece for a microphone having a diaphragm 3. The unexpanded spring and the plate or resonator bound a closed space 2. When the spring is extended or distorted the space 2 is no longer cut off from the ambient air.
GB4278159A 1958-12-19 1959-12-16 Improvements in or relating to apparatus for transmitting acoustic vibrations provided with a variable acoustic impedance Expired GB934632A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL234436 1958-12-19

Publications (1)

Publication Number Publication Date
GB934632A true GB934632A (en) 1963-08-21

Family

ID=19751489

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4278159A Expired GB934632A (en) 1958-12-19 1959-12-16 Improvements in or relating to apparatus for transmitting acoustic vibrations provided with a variable acoustic impedance

Country Status (6)

Country Link
CH (1) CH375541A (en)
DE (1) DE1115302B (en)
ES (1) ES254241A1 (en)
FR (1) FR1242763A (en)
GB (1) GB934632A (en)
NL (2) NL108508C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187635A (en) * 1978-04-03 1980-02-12 Deissler Robert J Method and apparatus for sound production

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2263408A (en) * 1936-04-11 1941-11-18 Lakhovsky George Means for improving the sound emitted by microphones, loudspeakers, and the like
DE1073546B (en) * 1955-05-26 1960-01-21 Rudolf Gorike Wien Dr Directional microphone with low vibration and wind sensitivity

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187635A (en) * 1978-04-03 1980-02-12 Deissler Robert J Method and apparatus for sound production

Also Published As

Publication number Publication date
FR1242763A (en) 1960-09-30
ES254241A1 (en) 1960-03-01
NL108508C (en)
CH375541A (en) 1964-02-29
DE1115302B (en) 1961-10-19
NL234436A (en)

Similar Documents

Publication Publication Date Title
GB670868A (en) A filter for sound vibrations and a microphone and telephone provided therewith
GB780810A (en) Sound reproducing system and loudspeaker
GB934632A (en) Improvements in or relating to apparatus for transmitting acoustic vibrations provided with a variable acoustic impedance
GB851938A (en) Improvements in and relating to electro-acoustical transducers
GB742889A (en) Improvements in or relating to loud speakers and like electro-acoustic transducers
JPS5229725A (en) Acoustic equipment diaphragm
GB747263A (en) Improvements in or relating to loudspeaker cabinets
GB1324058A (en) Telephone handset
JPS5324828A (en) Vibration plate for acoustic instrument and pre paration therefor
GB1016716A (en) Improvements relating to electro-acoustic transducers
GB732388A (en) Twin unit stethoscope headphones
JPS57123798A (en) Motional feedback type speaker
ES39054U (en) Listen pillow (Machine-translation by Google Translate, not legally binding)
GB920172A (en) Improvements in or relating to devices for producing acoustic signals
GB921213A (en) Improvements in and relating to loudspeaker enclosures
USD244468S (en) Desk telephone station with built-in freespeaking device and an additional casing for a sound transmitter and/or receiver
FR2362547A1 (en) Servo controlled bass loudspeaker enclosure - has feedback system to obtain low bass frequency and independence of air loading
GB1001391A (en) Improvements in or relating to telephone instruments
JPS5374418A (en) Dynamic type electroacoustic transducer
JPS52141158A (en) Reverbe unit
GB739216A (en) Improvements in or relating to telephone subsets incorporating bell sets
GB567955A (en) Improvements in and relating to moving coil loudspeakers and microphones
GB716801A (en) Acoustic duct for electro-acoustic transducer
GB729620A (en) An acoustic device with an inverted horn having a throat vented to the atmosphere
GB1112266A (en) Removable fitting for telephone mouthpiece