GB258643A - Improvements in or relating to electrical means and systems for the transmission of sound - Google Patents

Improvements in or relating to electrical means and systems for the transmission of sound

Info

Publication number
GB258643A
GB258643A GB1603425A GB1603425A GB258643A GB 258643 A GB258643 A GB 258643A GB 1603425 A GB1603425 A GB 1603425A GB 1603425 A GB1603425 A GB 1603425A GB 258643 A GB258643 A GB 258643A
Authority
GB
United Kingdom
Prior art keywords
condenser
grid
microphone
frequency
oscillatory circuit
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
GB1603425A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1603425A priority Critical patent/GB258643A/en
Publication of GB258643A publication Critical patent/GB258643A/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
    • H04R19/00—Electrostatic transducers
    • H04R19/04—Microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

258,643. Rickets, W. J. June 22, 1925. Systems modified for using condenser telephones.-Condenser telephones are associated with oscillating thermionic valves in such a way as to produced currents of telephonic frequency, the valve acting as an oscillator, as a modulator, and as a rectifier. High-frequency oscillations produced in an oscillatory circuit 3, 4 by means of a reaction coil 10 are passed to the grid I through the microphone condenser 2. The rectified low-frequency currents are passed through a transformer 6. According to modifications, the microphone is used in place of or in parallel with the condenser 3 ; the microphone is caused to vary the reaction by connecting it between the plate and grid or in series with a reaction coil; a tuned wave trap is connected between the grid and filament and the microphone is used as the tuning condenser or as the grid condenser; a differential condenser microphone is used and the central diaphragm is connected through an oscillatory circuit to the filaments and the outer plates connected to the grids of two valves working on the push-pull system, or the central diaphragm is connected to the grid of -a valve and the outer plates form the condenser of an oscillatory circuit in which the mid-point of the inductance is connected to the filament of the valve; to prevent direct current passing through the low-frequency transformer it is shunted by a battery, a variable resistance, and an inductance in series and by a high-frequency bye-pass condenser.
GB1603425A 1925-06-22 1925-06-22 Improvements in or relating to electrical means and systems for the transmission of sound Expired GB258643A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1603425A GB258643A (en) 1925-06-22 1925-06-22 Improvements in or relating to electrical means and systems for the transmission of sound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1603425A GB258643A (en) 1925-06-22 1925-06-22 Improvements in or relating to electrical means and systems for the transmission of sound

Publications (1)

Publication Number Publication Date
GB258643A true GB258643A (en) 1926-09-22

Family

ID=10069940

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1603425A Expired GB258643A (en) 1925-06-22 1925-06-22 Improvements in or relating to electrical means and systems for the transmission of sound

Country Status (1)

Country Link
GB (1) GB258643A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489378A (en) * 1945-03-31 1949-11-29 Zenith Radio Corp Modulated-oscillator type phonograph reproducing system
US2489379A (en) * 1946-04-13 1949-11-29 Zenith Radio Corp Modulated-oscillator type signal translating apparatus
US2818760A (en) * 1953-09-28 1958-01-07 James M Spencer Modulation system for electrical musical instrument

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489378A (en) * 1945-03-31 1949-11-29 Zenith Radio Corp Modulated-oscillator type phonograph reproducing system
US2489379A (en) * 1946-04-13 1949-11-29 Zenith Radio Corp Modulated-oscillator type signal translating apparatus
US2818760A (en) * 1953-09-28 1958-01-07 James M Spencer Modulation system for electrical musical instrument

Similar Documents

Publication Publication Date Title
GB182135A (en) Improvements in or relating to wireless signalling systems
GB258643A (en) Improvements in or relating to electrical means and systems for the transmission of sound
GB242653A (en) Improvements in radio signalling systems
US2437872A (en) Phase modulator
US1847190A (en) Electric wave signaling system
US2025610A (en) Frequency multiplication system
US1675888A (en) Radiotransmission
GB164105A (en) Improvements in wireless telephony
US1835388A (en) High frequency modulating system
US2422878A (en) High level modulation system
US1375481A (en) Power-modulator for radiotransmission
GB142474A (en) Improvements in the use of thermionic devices for producing frequency harmonics of electric oscillations
GB168967A (en) Improved method of signalling in systems generating high-frequency oscillations
GB241417A (en) Electric signalling system
GB237025A (en) Improvements in radiotelephonic and other signalling systems
GB246892A (en) Improvements in and relating to thermionic oscillation generators
GB270871A (en) Improvements in and relating to wireless telegraphy and telephony
GB178971A (en) Improvements in or relating to high frequency electrical apparatus
GB319786A (en) System of wireless telegraphy and telephony
GB369112A (en) Improvements in or relating to modulating systems for electric oscillations
GB228159A (en) Improvements in vacuum tube oscillation generators for wireless transmission
GB157407A (en) Improvements in wireless telephone transmitters
GB216308A (en) Improvements in or relating to wireless systems
GB250969A (en) Improvements in receivers of high frequency electrical energy
GB159683A (en) Improvements in or relating to wireless reception apparatus