GB546478A - Electroacoustic translating method and means - Google Patents

Electroacoustic translating method and means

Info

Publication number
GB546478A
GB546478A GB653/41A GB65341A GB546478A GB 546478 A GB546478 A GB 546478A GB 653/41 A GB653/41 A GB 653/41A GB 65341 A GB65341 A GB 65341A GB 546478 A GB546478 A GB 546478A
Authority
GB
United Kingdom
Prior art keywords
electro
strictive
modulating
wave
jan
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
GB653/41A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB546478A publication Critical patent/GB546478A/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
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Abstract

546,478. Telephone instruments ; wireless transmitting and receiving systems. STANDARD TELEPHONES & CABLES, Ltd. Jan. 17, 1941, No. 653. Convention date, Jan. 23, 1940. [Class 40 (iv)] [Also in Group XL] An electro-acoustic system for modulating or demodulating high-frequency waves comprises laminations of electro-strictive or piezoelectric material. The electro-strictive material may be hard rubber coated on its upper and lower surfaces with a thin conductive film. Fig. 2 shows an electro-strictive telephone receiver in which alternate pairs of adjacent coated surfaces are connected by wires 27, 271 and a band-pass filter 30, 31, 32 (to give a voltage step up) through a radio-frequency amplifier 29 to a receiving aerial, no detector being required. The receiver may be associated with a wave-guide transmission system or may be coupled through a tuned circuit comprising condenser 35, Fig. 3, and coil 34 with a hollow electric-wave resonator 33. For modulating a carrier wave, sound waves cause the diaphragm to deform the electro-strictive material, thus varying its capacitance and modulating the carrier current in circuit therewith.
GB653/41A 1940-01-23 1941-01-17 Electroacoustic translating method and means Expired GB546478A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US546478XA 1940-01-23 1940-01-23

Publications (1)

Publication Number Publication Date
GB546478A true GB546478A (en) 1942-07-15

Family

ID=21992555

Family Applications (1)

Application Number Title Priority Date Filing Date
GB653/41A Expired GB546478A (en) 1940-01-23 1941-01-17 Electroacoustic translating method and means

Country Status (3)

Country Link
US (1) US2263308A (en)
BE (1) BE441600A (en)
GB (1) GB546478A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567407A (en) * 1948-04-23 1951-09-11 Stromberg Carlson Co Electroacoustic transducer
US4310731A (en) * 1979-08-02 1982-01-12 Dynamic Compliance, Incorporated Thermal motion transducer

Also Published As

Publication number Publication date
US2263308A (en) 1941-11-18
BE441600A (en)

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