GB719780A - Improvements in or relating to oscillation generators - Google Patents

Improvements in or relating to oscillation generators

Info

Publication number
GB719780A
GB719780A GB16265/51A GB1626551A GB719780A GB 719780 A GB719780 A GB 719780A GB 16265/51 A GB16265/51 A GB 16265/51A GB 1626551 A GB1626551 A GB 1626551A GB 719780 A GB719780 A GB 719780A
Authority
GB
United Kingdom
Prior art keywords
frequency
harmonic
mixer
fed
oscillator
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
GB16265/51A
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.)
General Electric Co PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB16265/51A priority Critical patent/GB719780A/en
Priority to DEH14438A priority patent/DE958054C/en
Publication of GB719780A publication Critical patent/GB719780A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C17/00—Sofas; Couches; Beds
    • A47C17/04—Seating furniture, e.g. sofas, couches, settees, or the like, with movable parts changeable to beds; Chair beds
    • A47C17/16—Seating furniture changeable to beds by tilting or pivoting the back-rest
    • A47C17/20—Seating furniture changeable to beds by tilting or pivoting the back-rest thereby uncovering one or more auxiliary parts previously hidden
    • A47C17/207—Seating furniture changeable to beds by tilting or pivoting the back-rest thereby uncovering one or more auxiliary parts previously hidden with seat cushion consisting of multiple superposed parts, at least one lower hidden part being used to form part of the bed surface
    • A47C17/2076—Seating furniture changeable to beds by tilting or pivoting the back-rest thereby uncovering one or more auxiliary parts previously hidden with seat cushion consisting of multiple superposed parts, at least one lower hidden part being used to form part of the bed surface by lifting or tilting
    • 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
    • H03B21/00—Generation of oscillations by combining unmodulated signals of different frequencies
    • H03B21/01—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies
    • H03B21/02—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies by plural beating, i.e. for frequency synthesis ; Beating in combination with multiplication or division of frequency

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Nursing (AREA)
  • Networks Using Active Elements (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Special Chairs (AREA)

Abstract

719,780. Generating high frequency oscillations. GENERAL ELECTRIC CO., Ltd., and BRYDEN. J. E. June 25, 1952 [July 9. 1951], No. 16265/51, Classes 40, (5) and 40 (6) A harmonic generator and selector comprises a mixer 1 fed with a variable frequency oscillation and with the harmonics of the second harmonic of a reference oscillator 3. A voltage derived from a difference frequency output of the mixer is fed to a further mixer 11 together with a reference frequency oscillation or the second harmonic thereof (according to the position of a switch 12). An output from this mixer is fed through either of two band pass filters 13, 14 having their midfrequencies spaced by the reference frequency and a voltage derived from the filter is fed to a further mixer, 17 to which is fed a second variable frequency oscillation. The desired harmonic is selected from the output of this mixer. The two variable frequency oscillations are derived from a single oscillator 2 and the circuit is such that the particular harmonic selected is determined by the frequency of the variable oscillator, the position of the switch 12 and which of the two band pass filters are used, and the output frequency is independent of small variations of the frequency of the variable frequency oscillations. In the circuit shown, with both switches 12 and 15 to the left the output frequency is the (2N-1)th harmonic of the reference oscillation and with the switches to the right the (2N-2)th harmonic is selected, N being determined by the frequency of the oscillator 2. Thus by varying the frequency of oscillator 2 in steps and using both switch positions at each step a range of adjacent harmonics may be produced. The filter 8 preferably has a mid-frequency which falls midway between two of the harmonics from the harmonic generator 6.
GB16265/51A 1951-07-09 1951-07-09 Improvements in or relating to oscillation generators Expired GB719780A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB16265/51A GB719780A (en) 1951-07-09 1951-07-09 Improvements in or relating to oscillation generators
DEH14438A DE958054C (en) 1951-07-09 1952-11-12 Sofa bed or sofa bed

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB16265/51A GB719780A (en) 1951-07-09 1951-07-09 Improvements in or relating to oscillation generators
DEH14438A DE958054C (en) 1951-07-09 1952-11-12 Sofa bed or sofa bed

Publications (1)

Publication Number Publication Date
GB719780A true GB719780A (en) 1954-12-08

Family

ID=45998690

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16265/51A Expired GB719780A (en) 1951-07-09 1951-07-09 Improvements in or relating to oscillation generators

Country Status (2)

Country Link
DE (1) DE958054C (en)
GB (1) GB719780A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202931A (en) * 1963-03-06 1965-08-24 Jr Roland F Koontz Coherent frequency converter for testing microwave devices with audio spectrum analyzer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1654299B1 (en) * 1967-05-16 1971-12-02 Luebke Kg Geb Lounge furniture
AT381850B (en) * 1982-05-17 1986-12-10 Hoppe Kg Hodry Metallfab SEAT SOFA BED
CH662046A5 (en) * 1983-12-20 1987-09-15 Stella Moebelwerk Gmbh Seating and reclining furniture.
IT1395078B1 (en) * 2009-08-04 2012-09-05 Famulari DEVICE TO ALLOW THE MOVEMENT OF AT LEAST TWO FLOORS

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB504907A (en) * 1938-12-13 1939-05-02 Endre Braun A settee or seat, adapted to be converted into a double bed
US2328411A (en) * 1940-08-02 1943-08-31 Superior Felt & Bedding Co Convertible couch structure
AT167893B (en) * 1949-08-24 1951-03-10 Johann Ortner Sofa bed
DE881250C (en) * 1950-03-21 1953-06-29 Hans Berger Double bed couch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202931A (en) * 1963-03-06 1965-08-24 Jr Roland F Koontz Coherent frequency converter for testing microwave devices with audio spectrum analyzer

Also Published As

Publication number Publication date
DE958054C (en) 1957-02-14

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