US1766050A - Multiphase cornet system - Google Patents

Description

Jimez4, 1930. L. c. YOUNG 1,766,050

MULTIPHASE CORNET SYSTEM 0n PHONES INVENToR.

Aumo AMP.

. TORNEY.l

June 24, lso.

L. lc. YOUNG l, MULTIPHASE CORNET SYSTEM 2 Sheets-Shee't .2

Filed, July 20, 1928 H mw.

` INVENTOR.

A TORNEY Patented June* 24,v v1930 UNIT-En STATES-[ PAT ENr- OFFICE LEO C. YOUNG, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR, BY-'MESNE AS- SIGNMENTS," FEDERAL TELEGRAPH COMPANY, A CORPORATION OF CALIFORNIA.

Application med muy 2o,

My invention relates to transmission and reception systems in general and more specifically -to systems-wherein a plurality of frequencies are employedfor the'transmission and reception of high frequency' signaling energy. l

An object of reception of high frequency signaling. energy whereby uniform reception at all times isfmade possible.

.A general understanding can be hadof the transmission and reception system of my 1. invention by referring'to the accompanying drawings in'which: y

Figure 1 is a diagrammatic illustration of the general embodiments of my invention; Fig. 2 isi-a' V schematic circuitV diagram of the transmission system of my invention and Fig. y3 is a schematic circuit diagram of the receiving system of. my invention.

In high frequencysignaling systems and" especially in systems l wherein ultra-highl frequency energy is employed, uniformsig- `nal stren h at the receiving station is not usually o tained. during a considerable period of time. Signaling energy of one frequency subject to fading while at the same time ether frequencies are not materially aected. It'is also true that the nonuniform reception during day and night and i difference in the time between widely. distant points interferes with reliable communication. Signaling energy of one frequency might be received with an audible signal strength and simultaneously signalingl energy having a frequency differing from thelirst mentioned signaling energy might be inaudible. However, after an elapse-of considerablev time the signal'strength ratio of the two signals might be reversed.

In the drawings Fig. 1, a4 master oscillatorV 1 having frequency characteristics of 4,000

kilocycles is shown associated with an amplifier 2 tuned to the same frequency. The .out

put energy from amplifier 2 is shown coupled to amplifier 3 anda frequency'doubling circuit V6. Amplifier 3 is tuned to 4,000 lfilo-l cycles-and is'associatedwith a second amplifier-4 which-is tuned to the'same frequency.

my invention is to provide an improved system for the transmission and kand load circuit 16.

192s. serial No. 294,284. i

`A load circuit 5 is associatedv with the output of amplifier 4. A source ofenergy 9 of varying amplitude'controls the operation of amplifier 4 according to the frequency of variation.' The output of the frequency doubling circuit 6 is connected to amplifier 7 which is tunedrto 8,000 kilocycles. v A second' ampli- 8,000 kilocycleaf-A source of energy 10 of periodically varying amplitude is associated with ampllfier 8 'and controls the operation according tothe frequency of variation. A

- second frequency doubling circuit 3 is associated with'frequency doubling circuit 6.

vAmplifier 14 is connected to frequency doubling circuit13 and to a second. amplifier 15- Frequency doublingcircuit 13, amplifiers 14 and 15 andy lo'ad cir-v cuit 16 are each tuned to the .frequency l6,000.'kilocycles. A source of energy 11 of periodically varying amplitude' is associated vfier 8 having a load circuit 12 is associated with amplifier 7 and tuned -to a frequency of with Vamplifier' 15 and controls the operation according to the frequency of variation. Sources of energy 9*;,10 andy 11 havin different'phase relations, energize ampli ers 4, .-8 and 15 respectively at dilferentgintervals of time. High frequency energyfis 'transsuccessive intervals of time. 'In the example cited the high frequency signaling energy of 4,000 kilocycles Ais transferred tothe load circuit 6, followed'by the .8,000 kilocycle signaling energy transferred'to the load circuit 12 vand thelatter followed by the 16,000 kilomitted to the- -load circuits, 12 and-16" at 'i l stitute a source of high frequency signaling I energy. lThe filament circuit is illustrated as being energized from an alternating current transformer 19 having ,a connection from its electrical center to ground 32. The

- grid circuit of thermionic vacuum tube 1 includes a mechanically viloratilev element 18,

nal of the mechanically vibratile element' which maybe a piezo lelectric crystal, and radio frequency choke coil 17. One termi- 18 and ofradio frequency choke coil 17 `is connected to ground. This connectioncompletes the grid circuit since lthe electrical `center of vthe'filament is likevviselconnected -to ground 32. The mechanically vibratile element18 maintains the oscillatory'circuit,

of thermionic vacuum tube 1 at a constant frequency. The .radio frequency plate circuitv includes inductance 20' and suitable l capacities.. The plate circuit is adjusted'to a frequencyvalue corresponding to the approximate frequency characteristics of mechanically vibratile element 18. The direct ,current plate supply-includes source 33, the

negative vterminal of-vvhich is connected to ground 32,. and radio frequency choke 'coil 17 which excludes radiov frequency energy from direct currentv source 33. Vacuum tube *.2 having grid, filament', plate and shielding plate electrodes amplifies the radio frequency output'energy from oscillator 1. The grid electrode of amplifier2 is supplied with aA biasing 'potential from source 34.

y The positive terminal of source 34 is shown grounded although the polarity might be in the reversedgorder depending upon the particular characteristics of vacuum tube 2.

. A resistance 31 is employed in series with .the shielding plate potential 33 whereby the plate has ahigher positive potential. in re# spect to'the shielding plate electrode and filament circuits. Inductance 21, in the radio frequency plate circuit, is tuned to a frequency value corresponding' to the fre- -ciated circuits.

quency of the oscillator- 1'. A second ampli,-l vfieris associated With. amplifier 2 and in-Iv cludesl vacuum tube 3 having filament, grid, plate and shielding late electrode and asso- In uctance vv22, in the out- I put circuit o f amplifier 3 is tuned to a freiency value corresponding to amplifier 2. source of grid biasing potential 34 maintains the grid, electrode of amplifier 3 at -the proper potential dep-ending upon the y characteristics of the particular type of tubev employed. Resistance 31 is "employed inv series with the shielding plate electrode and' .source of plate .potential 33.- A parallel connected grid biascircuit is shown employing a radio frequency choke coil 17 for` excluding radio frequency energy from source ,of potential 34. The inputA circuit of a third amplifier 4 is associated with the output cirpotential 9 and the grid circuit' of amplifier 4. The plate circuit of amplifier 4 includes inductance 23 which is tuned .to a frequency.I

value corresponding to that of amplifier 3. The filament circuit of amplifier 4 is shown energized by transformer 30, the electrical center connected to ground 32. A source of plate potential 36, With its negative terminal connected to ground 32 also supplies a positive potential tothe shielding plate electrode through resistance 31.. A switch 48 is provided forI interrupting the operation of amplifier 4 if so desired. VA load circuit 5 is associated Withinductance 23,4a'nd may be either a space radio radiating system, a

tional amplifier circuits.

. A frequency doubling circuit is associated i Wired radiov transmitting system or addiwith the 'plate circuit inductance 21 of amplifier 2 and includes thermionic vacuum tube 6 having grid, filament'2 plate, shielding plate electrodes and associated grid, lament and platecircuits. A source of grid biasing potential 34 maintains the grid electrode of thermionic vacuum tube 6 at the proper potential for best operation. The value of the potential and polarity of the same depends upon the operational characteristics ofthe particular type of tube employed. Radio frequency choke coil'17 eX- 'cludes radio frequency energy from the source of potential 34. The plate circuit of vacuum tube 6 includes inductance 24 Which is tuned to a frequency value corresponding to twice the frequency of amplifier 2. Source icc of plate potential 33 is connected in series with inductance 24, the plate electrode and the ground connection 32 which is Acommon to the electrical center of vall filamentcircuits. The shielding plate electrode is supplied With a positive potential from source 33 through resistance 31. -An amplifier -is associated'with the output circuit ofk frequency doubling circuit 6 and includes thermionic vacuum tube 7 having grid, filament, plate,shie'lding plate electrodes and asso. ciated grid, filament and plate circuits. x A

source of grid biasing potential 34 supplies the proper potential to the grid-electrode. Radio frequency choke coil 17 excludes radio `frequency energy from source of potential 34. A ysource of `potential 33 supplied the plate' electrode. and shielding plate electrode with 'a positive potential in respect to the filament circuits. Resistance 31 is included in the'potential supply circuit to the shielding plate electrode thereby giving it a lovvergpotential in respect to the potentiall supplied the plate electrode. The plate cir# cuit of amplifier 7 .includes inductance 25 tuned to. a. frequency corresponding to the frequency of inductance 24.' A second ampli- 1,'

fier 8' of similar circuit arrangement is coupled to the output circuit of amplifier 7.

A source of potential of varying amplitude a l10, 35 is supplied the grid electrodeof ampli 11, of varying fier 8. A load circuit 12 is associated with plate circuit inductance 26, and is tuned to a frequency' value corres onding to the frequency of,l amplifier circuits'-v 7 and 8. lA frequency doubling vcircuit 13, is associated with l frequencyl doubling circuit 6 and tuned to a frequency corresponding vto twice the frequency of amplifier 7; that is four times the frequency of the source of signaling energyv 1. Amplifiers 14'and 15 are'of similar cir-y cuit "arrangement'to amplifiers 7" and 8 respectively. The frequency characteristics Aof inductances 28'and 29, however,'are. of avalue twice the frequencyofinductances 25 and 26 respectively.

the respective grid electrodes of ampliersv 4, 8 and'15 no amplification of the signal.

results. By exciting the respective grid cir` cuits at successive intervals o f time, the

lamplification of. signaling energy 4and the energization of :the respective load circuits will correspond to ,theL frequency of such excitation.

A schematic circuit diagram of the receiving system of my invention is shown in Fig.- 3 wherein 47 and-'47a represent :antenna and ground yconnections respectively.- .Instead of 'a space radio receiving system, the source of incoming signaling energyV could be a wired radio system or several aperiodic amplifiers having Ilo naturalI period of their own. Three thermionic vacuum tubes 41, 42

and 43 each having grid,lilament and plate electrodes, are connected in regenerated c ircuitarrangements. The respective grid circuits associated'with' vacuum `tubes 41,` 42 and 43 include inductances 44, 45 and 4.6 and capacities. 58, 59 and 62 respectively. The audio frequency plate circuits of vacuum tubes 41, 42 and 43 include the transformer windings 60, 49 and 50 respectively. A single output winding 51`may, connect to an audio frequency amplifier or directly to a reproducer. The three plate circuits include a source of potential 53. The three grid circuits are tuned to three different frequencies corresponding tov the. three respective frequencies transmitted. Switches 4811l are provided whereby either or all of the three re- A load circuit 16 iscoupled to the plate circuit of amplifier 15,.

transferringthe respectivel sources of 'high frequency,signalingenergy to the thermionic Y vacuum tube circuits 41, 42-'and 43.. These capacities can be of the proper value corresponding tothe particular frequency of the source of energy transferred to the respective circuits. VBy referring to both Figs. 1

and 3 an understanding can be had of; the

operationof the complete system for transmission. and reception.

In Fig. lthe-'fmaster oscillator 1 'main- L tains the frequency'of the complete transmitting system at a constantvalue. The

frequency doublers 6- and 13 double and' quadruple thefre'quencies transferred to the amplifier circuits 8 and 15 respectively. The

load circuits 5,' 12 and 16, therefore, are supplied' with, high frequency energy 'having requency values corresponding to ythe fundamentalfre'quency ofthe master oscillator,-

the first even harmonic and the second even lharmonic respectively. The three frequencies, in the. example cited, are 4000 kilocycles, 8000 kilocycles and 16,000 kilocycles-'respec-gtively andare amplified and transferred to the' respective load circuits 5,12 and 16 atl different time intervals as determined bythe Yuulti-phase sources ofpotential 9, 10 and 1l'.A -hus the fundamental and multiple fref-l quencles 'are controlled from a common.-

source 1 and modulated by means of a multi# lphase lalternating current or multi-phase rate of -fluctuating direct currentl Vso that the fundamental frequency4 and the multiple ceiving-circuits may be employed, Coupling capacities' 55, 56 and 57 areprovided .for

.frequencies thereof are radiatedA or transmitted in rotation or'succession one after the other. y f

' Since thev high frequency energy of the fundamental frequency and thel energy of the respective harmonic frequencies 'bear a rdefinite phase relation without regard to sources 9, 1 0 and 11, it is obvious that this' phase relation' will continue when the three frequencies' are combined. at the receiving station. Without deriving the harmonic frequencies from a singlel high frequency Amaster oscillator but `from diferent'oscilla-- tors, it is obvious that the high, frequency energy of the fundamental` and the energy of the. harmonics-,would neutralize eachv lio adapted for signaling purposes. The super! imposition of signals upon the carriers may be 1n' common or individual in anymanner Ldesired as is well known to those skilled in* desired. The carrier energy may loe modu-` lated by voicefrequencies, by any ofthe various nreans well known to those lskilled intheart.

In Fig. ,3,the three grid circuits associated with thermonic vacuum tubes 4142 's and 48 are adjusted to frequency values c orresponding to v4000 kilocycles', 8,000 kilo- `cycles and 16,000 klocycles respectively. ,The Ymulti-phasev relation of the respective frequencies-corresponds to themulti-phase relation as transmitted. In the output circuit 51 the audio frequency signal strength will be-the sum of the received audio frequency signal strengthl in the respect- ive windings 60, 49 and 50,-neglect1ng losses and the fact that there still exists a phase relation between the respective frequencies. The

i effect howeveris as though the strength of t zo the respective audio frequencies is the sum of the individual frequencies. It is ytherefore evident that fading on one frequency would 'subtract only little from the strength of the audio frequency signal .in the'output Y* circuit- 51. The fading at one frequency is Ausually accompanied by a uniform, or vsometimes increased, signal at other frequencies.`

Due to the non-uniform signal strength at thevarious frequencies during the dayv andA night cycle, the highest frequency channel may be dispensed with, employed alone or in combination with one of the .other frequency hands. tions or severe static rdisturbanceson one frequency canv be eliminated by no t employ- "ing that particular frequency band.

In the foregoing specication and accompanying drawings, the particular frequencies chosen are chosen, only for the purpose of explaining the operation and are only arlbitrary.4 The three frequencies employed-- tubes illustrated in the amplier,circuits Some of thecircuits are shownemploying series connected plate supply andjparallel connected grid biasing supply. It. is likewise obvious that the plate circuits and grid circuits may be supplied witha potential cpnnectedv in any suitable manner. .Frequency doublers are shown but it is understood that any frequency multiplier ycould be employed without departing from the spirit of my invention. The threephase .al-

ternating current for periodically control' Interference from otherstaling the respective amplifiers might be rectified before it is employed to energize the respective grid circuits. Such means foralternately energizing the respective circuits might be employed by causing a multi-phase current, either alternating or direct, to successively energize the respective plate electrodes'v thereby' controlling the' phase relation of a plurality of transmitted frequencies; It is likewise obvious that the intermediate ainplifiers 3, 7 and 14 may be dispensed with, vor the circuits of these amplifiers may be controlled by the sources of multi-phase energy 9, 10 and 11 thereby cont trolling the input energy to amplifiers 4, 8 and l5 respectivelyV and hence the energy in the associated load circuits 5, 12 and 16.

In FigfS, rthe three vacuum tube circuits need not loeof the regenerative type illustrated but mi ht be radio frequency amplifiers or audio requency amplifiers. The output transformerl and windings 60, 49, 50 and 51 might be either air core or iron core ydepending on the frequency. "The antenna circuit 47, 47l might be either the'output circuit of a wiredradioytransmission system or the output of preceding amplifier circuits. I realize that many circuit arrange ments may he employed differing from those illustrated' 1n the accompanying `drawingsy and describedin the foregoing specification' withoutdeparting from the spirit of my in- 4 vention and it-is not intended ythat my in-` 1 vention be restricted to the accompanying drawings or to the foregoing specification ioo t but only as defined lin the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is as follows s4 i Y 1. high frequency transmission system 'comprising a common source of high frequency signaling energfy, means for. doubling the-'frequency value 'o said high frequency ,source of energy, means for amplifying the energy at a frequency corresponding 'to the frequency. ofsaid source of energy, means for amplifying said double frequency and .means for causing alternate transmission of signals having a frequency` corresponding to the frequency lof said source of energy and intervals of time. i

2. high frequency transmission system comprising a single source of high frequencyv signaling energy, means for amplifying harmonic frequencies of the energy of said Vsaid double, frequency energy atsuccessivev`source of energy, means for amplifying the energy at a frequency correspondingto the frequency of said source of energy and meansA for lcausing the transmission of said source of energy and said harmonic `fre quencies in a predetermined alternate order.

3. A high frequency transmission s stem comprising in combination a source o high frequency energy, means for amplifying the' iso .y i

, of high' frequency energy, thermionic vaca- 'um tube amplifying' means for amplifying energy at a frequencycorresponding tothe frequency of said source of energy, means for amplifying harmonic frequencies lof the 'frequency of said source ofy energy and a lplurality of sources of ,energy having a definite phase relation Aassociated with said amplifying means whereby theenergy of fundamental frequency of said vsourcelof high frequency energy and the energy of .said harmonic frequencies .are amplified in a predetermined 'alternateA and successive.

' 4. A transmitting system comprising in combination a thermion-ic vacuum tube' circuit arrangement for generating oscillations said generated oscillations, means for `ampli-l fying harmonicfreq'uency energy-of the generated high frequency energy and means for alternately energizing lsaid first mentioned amplifying meansand saidlast mentioned amplifying meanswfor effecting the alternate transmission of the fundamental frequency energy ofI said generated oscillations l and i said harmonic frequencyenergy.l Y'

f5. Av transmitting system comprising in combination constant frequency generating means, means for lamplifying the undamemtal frequency ofthe generated energy from said. means, means for amplifying harmonicfrequencyv Aenergy of said flmdamental` fre- Aquency energy from said generating means, sources of varying potential for energizing said lamplifying means and means for altermately energizing said amplifying means at predetermined. successive intervals of time.

6. In a transmitting system wherein af ofa source of high fundamental frequenc frequency energy and?l a plurality of harmonicfrequenmes of the fundamental fref transmitted at lpredetermined successive in quency of said source are transmitted, means or alternately` energizing' said system wherebyl said fundamental'frequency and the, energy of said harmonic frequencles'jare tervals of. time.

7. A high .frequency'transmission system comprising i'n combination a constant frequency vacuum tube oscillator circuit, a .plu-

rality vof amplifiers adjustedto frequency values corresponding to a vplurality of different multiples of the oscillator frequency and a multi-phase source of`ene`rgy. for alternately and injsuccessive order energizing said amplifiers fromsaid multi-phase source of energy. l

8. A high frequency transmissmn system comprising in combinatlon a source of constant frequency energy, means for amplify! ing the energy of fundamental frequency of said energy', means for amplifying the energy of harmonic freuencies of said high frequency energyfan a source of multi? i phaseenergy for alternately energizing said amplifying means in successive order.

9. A transmission system comprlsmg 1n combination a thermionic vacuum tube oscillater circuit, a plurality of vacuum .tube amplifiers for amplifying. the energy of vthel fundamental frequency of.' said oscillator circuit-and the energy of the harmonic frequencies of said oscillator circuit respectively by alternately energizingsaid ampli-.

iiers from a source of multi-phase potential. 1G, A transmission system of high fresource of high frequency energy, means for selecting and amplif ing energy of the harmonic requenies o sald source of energy quency energy comprising incombnation a and'means tol alternately and in successive l-order transmit energy of the lfundamental frequency of` said source of energy; and the energy of said harmonic frequencies.

11. A transmission system wherein the fundamental high frequency energ of constant frequency value and energy o multiple I `frequency of said high frequency energy are l"amplified by independent` means, means for #alternately and in successive order trans# mitting the fundamental frequency energy of. said high frequency energy and said mul- -tiple frequency energy by alternately energizing said-independent means.

12. A transmission system ofwhigh.A fre- N 'harmonic frequency energy of the fundamental frequency energy of said oscillator circuitand a source'of multi-phase potential for alternately energizing said. amplifiers in successive order tov effect alternate transmission of said .fundamental frequency i energy and said. harmonic -frequency energy.

' 13.v transmissionsystem for high frequency signaling energy comprising4 in combination a source of constant frequency energ'y of fundamental frequency and energy f of harmonicfrequencies of said source of energy, a1sourcecfmulti-phase energy and means foi` causing Said. source `of multi phase energyto control the -alternate transmission of the fundamental frequency of said source of ener 14. A ,transmission system for high frebination a thermionic vacuum tube oscillator circuit for generating high frequency energy of a fundamental frequency, means .for amplifying said high frequency energy of fundamental frequency, means for selecting and amplifying energy of even multiple harmonic frequency of said high fre- ,i and the energy of said harmomcv frequencies.

quency signaling energy comprising 1n comquency energy of 'fundamental'4 frequency,

a plurality of sources .of electrical energy and means for causing said last mentioned sources ofv energy toenergize said amplifying means according to the phase relation of said last mentioned lsources of energyv whereby` said energy of .fundamental fre- Vfquency and energy of even multiple harmonic frequency is transmitted in alternate order.

15. A transmission system of high frequency signaling energy comprising in combination a thermionic Vacuum tube generating means and a mechanically vibratile element v for maintaining the frequency of said generating means constant, thermonic vacuum tube amplifiers having the frequency characteristics thereof adjusted to amplify the fundamental frequency of said signaling energy from said generating means, thermionic vacuumV tube amplifiers having the frequency characteristics thereof adjusted to amplify energy having frequency values corl responding toharmonic frequencies of said signaling energy of fundamental frequency, a source of multi-phase energy associated with said amplifiers and means for causing said source lof multi-phase energy to excite said first and last mentioned lamplifiers in alternate and successive order corresponding to the frequency ofsaid source of multi-phase energy.

16. A high frequency transmission sys- -tem comprising a thermionic vacuum tube generator Aof constant frequency energy, .means for causing multl-phase sources o potential to ener 'Zesaid system whereby' the fundamental equency'l'of said constant frequency energy and harmonicfrequency energy of said constant frequency energy alternately energize associated load circuits predetermined successive intervals of e. Y 17. A frequency signaling enegy comprising in combination athermionic vacuum tube high frequency oscillator for producing high frequency energy, means for selecting harmonic frequency energy of said high frequencyy energy from said oscillator, a multi-phase source of electrical energy and means/for causing the transmission of the fundamental frequency of said high frequency energy and said harmonic frequency energy in alternate and successive order according to the frequency of said multi-.phase'source of electricalenergy. l.

18. A high frequency transmission system comprising in `combination a thermionic vacuum tube oscillator for generating 4,high frequency energy, lthermionic .vacuum tube amplifying means associated with said oscillator, a source'of Ymulti-phase electrical'. energy and means 'for causing said multiphase energy to alternately energize amplifor the transmission of highfiers having their frequency characteristics adjusted to the fundamental frequency of said generating means .and amplifiers hav- .ing their frequency characteristics adjustedv to harmonic frequenciesv of the fundamental frequency of the generated energy whereby the energy of said harmonic frequencies and the Senergy of saidfundamental frequency are alternately transmitted'.

19...A system for the transmission of high frequency energy comprising in combination a'source of constant frequency signaling energy, means for 'selecting harmonic frequencies' of the fundamental frequency of said source ofsignaling energy and a source of multi-phase energy for causing the alternate'transmission of the energyof fundamental frequenc of said source of signaling energyand sai harmonic frequencies of the 'fundamental according to the' fre- .quency of said sourceof multi-phase energy,

a successive. and alternate order as determined by the frequency of said'source multiphase electrical energy. x

LEO YOUNG.'

vlos

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