GB295957A - Improvements in wireless transmission and reception - Google Patents

Improvements in wireless transmission and reception

Info

Publication number
GB295957A
GB295957A GB745727A GB745727A GB295957A GB 295957 A GB295957 A GB 295957A GB 745727 A GB745727 A GB 745727A GB 745727 A GB745727 A GB 745727A GB 295957 A GB295957 A GB 295957A
Authority
GB
United Kingdom
Prior art keywords
frequency
piezo
electric crystal
reception
microphone
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
GB745727A
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 GB745727A priority Critical patent/GB295957A/en
Publication of GB295957A publication Critical patent/GB295957A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
    • H03B5/34—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being vacuum tube

Landscapes

  • Transmitters (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

295,957. Robinson, J. March 17, 1927 Modulating systems and apparatus.-The amplitude and mean frequency of a carrier wave are maintained constant, and the frequency is varied in accordance with the signal. The Figure shows a piezo-electric crystal Q associated with a diaphragm P<1> of a sound box or microphone M and adapted to control the frequency and to effect frequency modulation. In a modification a microphone is used and the amplified energy applied to a telephonic receiver the diaphragm of which is associated with the piezo-electric crystal. The frequency variation is preferably small and within the limits imposed by one half of the crevasse of a piezo-electric resonator and the frequency of the variation may be either sonic or supersonic. Reception is preferably effected by the supersonic method so that signals of a constant frequency may be applied to a tuned circuit shunted bv a piezo-electric crystal. Specifications 275,581 and 285,108 are referred to.
GB745727A 1927-03-17 1927-03-17 Improvements in wireless transmission and reception Expired GB295957A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB745727A GB295957A (en) 1927-03-17 1927-03-17 Improvements in wireless transmission and reception

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB745727A GB295957A (en) 1927-03-17 1927-03-17 Improvements in wireless transmission and reception

Publications (1)

Publication Number Publication Date
GB295957A true GB295957A (en) 1928-08-17

Family

ID=9833456

Family Applications (1)

Application Number Title Priority Date Filing Date
GB745727A Expired GB295957A (en) 1927-03-17 1927-03-17 Improvements in wireless transmission and reception

Country Status (1)

Country Link
GB (1) GB295957A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496975A (en) * 1945-04-17 1950-02-07 Premier Crystal Lab Inc Temperature responsive piezo-electric crystal oscillator
US2876420A (en) * 1955-09-20 1959-03-03 Fisher Radio Corp Transducer circuits

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496975A (en) * 1945-04-17 1950-02-07 Premier Crystal Lab Inc Temperature responsive piezo-electric crystal oscillator
US2876420A (en) * 1955-09-20 1959-03-03 Fisher Radio Corp Transducer circuits

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