US1842898A - Receiving system - Google Patents

Receiving system Download PDF

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Publication number
US1842898A
US1842898A US185813A US18581327A US1842898A US 1842898 A US1842898 A US 1842898A US 185813 A US185813 A US 185813A US 18581327 A US18581327 A US 18581327A US 1842898 A US1842898 A US 1842898A
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energy
frequency
signal
carrier wave
heterodyning
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Expired - Lifetime
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US185813A
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English (en)
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Bellescize Henri De Regnaul De
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Individual
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers

Definitions

  • Fig. l is a diagrammatic view of a receiving circuit made according to the invention.
  • Fig. 2 is a diagrammatic view of a circuit showing a modified form of the invention.
  • Certain long-distance transmission means are operated by more or less marked modulation of a carrier wave or else by alternate interruptions and re-establishments- (chop- For certain purposes lows, it may be necessary to pick up or obtain the carrier wave separated not only from the modulations which form the mode of signalproperly so-called, but also from the vasuch as atmospherics, jamming, etc.
  • this would be the carrier wave it self, a means covering several times ten or hundreds of dots, dashes and intervals (spaces). But this method is practically unserviceable in this simple form so that it is necessary tohave recourse to an artifice which forms the subject-matter of the present invention.
  • the means in question consist of double modulation by the aid of one and the same local modulator, the first modulation reducing the frequency to a sufficiently low value, and the second modulation restoring the original frequency. Between the two modulations, there is passed the low frequency 7 that the unknown phase of the generator disappears in the course of such successive subtractions and additions, so that the oscillation picked up has-the necessary properties, i. e., a constant amplitude, the frequency of the carrier wave and a well-defined phase.
  • this invention provides a local generator successively employed, that is, first for diminishing the frequency, and secondly to raise the resultant frequency so that there results the same initial frequency as at the beginning.
  • the original frequency is provisionally reduced so as to cause the signal to resonate in a circuit which has a high time constant whereupon the carrier wave is rid of amplitude fiunctuations due to signalling or strays.
  • the second modulation there is obtained a perfectly sinous carrier wave having exactly the frequency and the phase it had at the start.
  • the receiver being of any desired kind comprises an aerial 1, a secondary 2, and a certain number of stages 4, 7 for amplifying the magnitude, transformed or not, of the incoming oscillations.
  • a device 11 whose operation has been assumed to be improved by ridding the signal of its carrier ware, and an ordinary detector 15-12 whose operation, as is well known, is improved by the reinforcement of this wave.
  • point 5 of the receiver acts upon a controlling electrode 21 of a tube 21, another electrode 21 of which, is subject to excitation from a local oscillator 20 generating pulsations ol, the incoming signal pulsations being denoted by (00.
  • the said resonator acts upon one, 26, of the control electrodes of tube 26, another electrode 26 of which is subject to the action of generator 20.
  • selector 272829-30 only such oscillations as have pulsations m0 of the carrier wave are allowed to pass.
  • each such utilization for instance, comprises a pair of tubes 38, 42, the grids of which are connected with a suit-able point of an artificial wire 36 corresponding to a length of wave of the oscillations o0, and provided at one end with a resistance 35 to avoid reflections, this being done for phase regulation. Regulation of the amplitudes is effected by adjusting the sensi tivity of tubes 38, 42 by the aid of heating rheostats 39, 43.
  • Fig. 1 shows two cases of practical utilization.
  • a second practical application shows in what way, 011 the contrary, the action of the carrier wave upon a device such as a detector 1215 whose operation is improved,
  • Fi 2 Another mode of utilization of the carrier wave, according to the present invention, is represented in Fi 2. It consists in using this oscillation for modulating the signal, instead of a local oscillator.
  • the carrier wave after having been separated in a manner as hereinbefore described, from the oscillations forming the signal and adjusted to the desired phase, is applied, for instance, to a control electrode 48 in a vacuum tube 50, another electrode 49 of which receives the action of the signal.
  • the plate circuit is then passed by a unidirectional current whose alterations reproduce those impressed upon the carrier wave by the signaling apparatus, voice, key, or the like.
  • the action upon the next tube 58 is efiected, for instance, by the aid of well-known coupling means comprising resistance 55 and capacity 56.
  • condenser 06 is replaced by a convenient source of potential.
  • the filter 5253-54 causes the variations comprised in the signal band to flow into the resistance 55, but shunts those of a higher frequency; for instance, jamming having pulsation (0B transformed by modulation due to the carrier wave of the signal into oscillations having a pulsation u)B (u0 is eliminated by the filter, if this new pulsation is outsde the above hand.
  • This arrangement offers this additional advantage which is well-known in theory, though inapplied in practice, of eliminating jamming actions and disturbances whose phases are in quadrature with relation to that of the carrier wave of the signal.
  • a method for isolating and purifying the carrier wave of a received signal which comprises modulating the received signal twice by means of a single local oscillator, the first modulation l0wering the frequency for the object of establishing conditions of resonance with a circuit possessing a high time constant and the second modulation restoring the original frequency.
  • a device for isolating the signal carrier wave of a received signal which comprises a receiving and amplifying system, means comprising a local oscillator for modulating the incoming signal whereby the frequency is lowered, a resonating circuit for purifying said modulated signal and means comprising said local oscillator for restoring said original frequency.
  • means for receiving and amplifying transmitted signal energy means comprising a local source of oscillations for heterodyning said amplified energy and altering the frequency thereof, means comprising a resonating circuit having a low damping characteristic for resonating said altered frequency and means comprising said local source of oscillations for restoring the resultant energy to its signal frequency and rectifying means for obtaining the signal therefrom.
  • a method of wireless communication which comprises receiving energy of desired signal frequency, heterodyning part of said received energy for reducing the frequency thereof, resonating the beat frequency resulting from said heterodyning, heterodyning said resonated beat note for restoring the resulting energy to the frequency of the received signal energy, adjusting the phase and amplitude of part of said last named restored energy and combining said part with the unused portion of said received energy, limiting the amplitude of the resulting combined energy within predetermined limits, combining said limited energy with the unused portion of said restored energy and rectifying the energy resulting therefrom.
  • a wireless communication system in combination, means for receiving energy of desired signal frequency, means for heterodyning part of said received energy for reducing the frequency thereof, means for resonating the resultant beat note in a circuit having a relatively high time constant, means for heterodyning said resonated beat note for restoring the resulting energy to the he quency of the received signal energy, means for usting the phase and amplitude of part of said last named restored energy and means for combining said part with the unused portion of said received energy, an amplitude limiting device for limiting the amplitude of the resulting combined energy within predetermined limits, and means for combining said limited energy with the unused portion of said restored energy and rectifying the energy resulting therefrom.
  • an energy absorption circuit for receiving energy of any desired sig nal frequency, a local oscillation generator adapted to heterodyne part of said received energy for reducing the frequency thereof, means for resonating the resultant beat note comprising a filter circuit having a relative- 1y high time constant, means for heterodyning said resonated beat note comprising said local oscillation generator, said last named means being adapted to restore the resulting resonated beat note energy to the frequency of the received signal energy, means for adjusting the phase and amplitude of part of said last named restored energy and a triode for combining said part with the unused portion of said received energy, means for limiting the amplitude of the resulting combined energy within predetermined limits, and a rectifying circuit for combining said limited energy with the unused portion of said restored energy and rectifying the energy resulting therefrom.
  • a method of receiving wireless communication which comprises receiving energy of desired signal frequency, deriving a purified carrier wave by heterodyning part of said received energy for changing its frequency, resonating the resultant beat note, heterodyning said resonated beat note for restoring the resulting energy to the frequency of the received signal energy, altering the characteristics of part of said last named restored energy and combining said altered portion wit 1 the unused portion of said received energy, modifying the shape of the resulting combined energy wave, combining said modified energy wave with the unused portion of said restored energy and rectifying the energy resulting therefrom.
  • a method of receiving signals in wireless communications which comprises receiving energy of a desired signal frequency, heterodyning part of said received energy for reducing the frequency thereof, resonating the beat frequency resulting from said heterodyning, heterodyning said resonated beat note for restoring the resulting energy to the 5 frequency of the desired signal, adjusting the phase and amplitude of part of said last named restored energy so that it will be opposite in phase and equal in amplitude to the carrier Wave of the unused portion of said received energy combining said unused portion of received energy with said adjusted energy, limiting the amplitude of the combined energy, combining the limited energy with the unused portion of said restored energy and rectifying the energy resulting therefrom.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
US185813A 1926-05-07 1927-04-22 Receiving system Expired - Lifetime US1842898A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR629563T 1926-05-07

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US1842898A true US1842898A (en) 1932-01-26

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FR (1) FR629563A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510906A (en) * 1945-03-24 1950-06-06 Avco Mfg Corp Frequency modulation receiver
US2555557A (en) * 1947-02-25 1951-06-05 Rca Corp Diversity receiver
US2738380A (en) * 1950-02-07 1956-03-13 Murray G Crosby Exalted-carrier television receiver

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510906A (en) * 1945-03-24 1950-06-06 Avco Mfg Corp Frequency modulation receiver
US2555557A (en) * 1947-02-25 1951-06-05 Rca Corp Diversity receiver
US2738380A (en) * 1950-02-07 1956-03-13 Murray G Crosby Exalted-carrier television receiver

Also Published As

Publication number Publication date
FR629563A (fr) 1927-11-14

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