US2403385A - Signal-translating system - Google Patents

Signal-translating system Download PDF

Info

Publication number
US2403385A
US2403385A US503071A US50307143A US2403385A US 2403385 A US2403385 A US 2403385A US 503071 A US503071 A US 503071A US 50307143 A US50307143 A US 50307143A US 2403385 A US2403385 A US 2403385A
Authority
US
United States
Prior art keywords
signal
components
modulation
carrier
frequency
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 - Lifetime
Application number
US503071A
Other languages
English (en)
Inventor
Bernard D Loughlin
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.)
Hazeltine Research Inc
Original Assignee
Hazeltine Research Inc
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
Priority to BE473461D priority Critical patent/BE473461A/xx
Application filed by Hazeltine Research Inc filed Critical Hazeltine Research Inc
Priority to US503071A priority patent/US2403385A/en
Priority to GB12341/44A priority patent/GB588974A/en
Application granted granted Critical
Publication of US2403385A publication Critical patent/US2403385A/en
Priority to FR947380D priority patent/FR947380A/fr
Priority to CH262126D priority patent/CH262126A/de
Priority to DEP23575D priority patent/DE824069C/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/006—Angle modulation

Definitions

  • phase-modulation system it is desirable to it have at the receiver a phase-reference signal'representingthe absolute phase of the carrier com-- ponent of the receivedmodulated"carrier signal.
  • Arrangements have also been proposed which include i a sharpl selective filter for selecting a isignalhaving the average phase of a received phase-modulatedsignal, the signal so selected be signal.
  • It is a specificcbiect of the invention toprov-ide an improved signal-translating system for translating over a single channel a phase-modulated carrier signal and a. phase reference signal.
  • a -signaltranslating system comprises means for supplying .-a first signal'and: means for effectively supplying a second signal, the second signal: comprising a pair of signal components havingpredetermined phase relations with reference to, the first signal andbeing individually spaced. therefrom in the frequency spectrum by: equal and opposite values.
  • This systeme also includes, means for modulating theangular velocity of one of the firstland second signals in accordance with information .tobe transmittedlto develop almodulated carrier sig 'nal having predominant modulation. components within a modulation band that is located onlyin a portion of the frequency spectrum adjacent its j carrier frequency. Thewidth of. one modulation sideband thereof is less than one of. the aforesaid values.
  • the system includes: a..signal translating channel having input andoutput ter- .minals and means for applying to t'he input terminals thereof the. modulated-carrier signal and the other one of the -first and l second signals.
  • means are coupled to the output terminalsforutilizing the modulated carrier signaland the other one of the first :andsecond sig'. nals to derive the modulation components;
  • a signal- .translatingmsystem comprises'means for supplying -afirst-signal-and means for effectively supplying a secondAsignal, the-second signal comprising -apair of signal components havingpredetermined phase relations with reference to the first-mentioned signal and; being 1 individually spaced therefrom in the frequency spectrum by equal and opposite values.
  • the system also includes means for modulating the angular velocity of one of the aforementioned first and second signals in accordance with information to be transmitted to develop a modulated carrier signal having predominant modulation components within a modulation band located only in a portion of the frequency spectrum which is adjacent its carrier frequency, the width of one modulation sideband thereof being less than one of the aforesaid values.
  • the system includes a signal-translating channel and means for applying to the channel the modulated carrier signal and the other one of the aforesaid signals.
  • a receiver in a system for translating a composite signal which includes a first signal and a second signal, the second signal including a pair of signal components having predetermined phase relations with reference to the first signal and being individually spaced therefrom in the frequency spectrum by equal and opposite values.
  • one of the first and second signals is angular-velocity-modulated in accordance with information to be translated so as to provide a modulated carrier signal having predominant modulation components within a modulation band located only in a portion of the frequency spectrum which is adjacent its carrier frequency, the width of one modulation sideband thereof being less than one of the aforesaid values.
  • the receiver comprises a pair of input terminals for receiving the composite signal, frequency-selective means coupled to the input terminals for individually separating the modulated carrier signal and, the other one of the first and second signals, and means coupled to the frequencyselec'tive means for utilizing the separated signals to derive the modulation components.
  • Fig. 1 is a schematic circuit diagram of a complete signal-translating system in accordance with the invention
  • Fig. 2 is a graph utilized in explaining the operation of the system of Fig. 1
  • Figs. 3, 4 and 5 represent modifications of a portion of the signal-translating system of Fig. 1
  • Figs. 3a to 30, Fig. 4a and Figs. 5a and 51) comprise graphs used in describing the operation of the arrangements Figs. 3, 4 and 5, respectively.
  • Fig. 1 of the drawings there is represented schematically a complete signal-translating system, in accordance with the invention, composed of elements which, individually, are of well-known construction and design.
  • the system comprises a sending station Ill and a receiving station II, interconnected by a single signal-translating.
  • channel l2 having input terminals l3, l3 and output terminals I l, Hi.
  • Channel l2 may be a direct Wire connection as, for example, a telephone cable, or it may consist of a conventional radio link.
  • the sending station includes means for supplying an angular-velocity-modulated carrier signal having modulation components determined by information to be translated and predominantly in a predetermined band of frequencies.
  • This means comprises an oscillator l having a mean operating frequency f for supplying a carrier signal to be modulated, a source of phase-modulating signals i6 representing the information to be translated, and a phase modulator 'I'? having one input circuit coupled to oscillator l5 and another input circuit coupled to signal source It.
  • the sending station means for supplying a pair of reference-signal components having predetermined phase relations with reference to'the carrier signal applied to phase modulator ll.
  • the second carrier signal have substantially the same frequency and phase as that of the first carrier signal and, consequently, it is expedient to derive the second carrier signal directly from oscillator I5, as illustrated, although an auxiliary oscillator may be provided if desired.
  • the means for supplying a pair of referencesignal components also comprises a signal source it which supplies a modulating signal having a predetermined frequency f1, to be defined more particularly hereinafter, and a balanced amplitude modulator it having one input circuit coupled to oscillator i5 and another input circuit coupled to signal source iii.
  • the output circuit of modulator i9 is arranged to select only the upper and lower sideband components of amplitude modulation which are utilized as the reference-signal components, the second carrier Signal being suppressed.
  • Signal source iii may also be transmitted from sending station H) to receiving station I! over the channel [2.
  • means, comprising an amplitude modulator 29, are included in the sending station for modulating each of the reference-signal components produced in balanced modulator i9 in accordance with such additional information.
  • Modulator 2@ has one input circuit which is coupled to balanced modulator i9 and another input circuit coupled to a signal source 2!, representing the additional information to be translated.
  • the frequencies of the signals developed by source 2! are included in a predetermined band of frequencies, defined more particularly hereinafter.
  • the output circuits of modulators I1 and 26 are connected to the input circuit of a combining amplifier 22.
  • the output circuit of this amplifier is connected to input terminals l3, I3 of signal-translating channel I2, thereby to provide means for applying the phase-modulated carrier signal developed in unit 11 and the amplitude-modulated reference-signal components developed in unit Zil to channel i2 for translation to the receiving station H.
  • the receiving station comprises means coupled to the output terminals of channel i2 for utilizing the reference-signal components to derive the modulation components of the translated phasemodulated carrier signal.
  • This means includes an amplifier and equalizer 30, such as an amplifier having a frequency-response characteristic selected to compensate for any nonuniform frequency-response characteristics of channel I2, coupled to output terminals [4, i l of the channel and frequency-selective means or filters 3
  • and 32 are designed This means comprises renames :torhave passchandsewith.
  • 'Inrorderuto utilize the derived :1 reference carrier signal for the purpose of detecting all of the phase-modulation components of the received phase-modulated carriersignal, it is desirable to :convert. the frequencyof the carrier component.
  • a frequent converter or multiplier 35 isprovided in'receiving station I I, coupled to the "outputcircuit of filter 33.
  • This detector maybe generally similar to that included in the phase-control system disclosed Fig. 1 of United States Letters Patent 2,231,?041, issued on February. 11, 1941, to Leslie F. Curtis. .Such a detector comprises of diodes to which the phase-modulated carrier signal is applied with like phase and to which the reference carrier signal is applied with opposite phase.
  • the cut .The unidirectional voltages developed in the load tected amplitude-modulation components may be .suppliedthereto for utilization in any. desired manner.
  • asingle utilizing circuit 38 has been shown. It will be understood that this unit includes circuit arrangements for utilizing'the modulation components derived in each detector 36 and 3?. In the most. general case, unit comprises two circuit arrangements individually designed to utilize the signaloutput of one of detectors Stand 3?.
  • phaselnodulated signal may be deflnedes-having modulationcomponents predominantly in apredetermined band-of frequencies; which. band is determined by" the maximum deviation of the carrier
  • band is determined by the maximum deviation of the carrier
  • component of frequency f0 corresponding-to-theoperating frequency of oscillator 15 aud o band of phase-modulationcomponents having thedimiting frequencies of jo+Af and fo-Af,
  • .z'Ilhe.carrier'signalfo supplied by oscillator 15 is alsoamplitude-modulated in modulator I9 with a modulating signal. having a frequency f1 .to produce upper and-lower 'sldeband components' having the frequencies fu-i-fi'and fu-h,
  • phase relations -with reference. to their carriertcomponentsfol-as to combine iniphase t herewith l and, it home, are 4 suitable reference-signal components for'providingla phase-reference signal representing the-absolute phase of the carrier signal foFmodulated in unit ll.
  • the resulting sig- .naltoutputtofmodulator :20 comprises a pair of -amplitdde-modulatd reference-signal 1 compoapplied to channel I2 for translation to the receiver.
  • This channel has a pass-band characteristic sufiiciently wide to pass the referencesignal components and their associated bands of modulation components a, b.
  • these signals are selectively amplified in unit 30 to compensate for any nonuniform frequency-response characteristics of the translating channel and are thereafter individually separated by filters 3l-33, inclusive, their separation being facilitated by virtue of the aforementioned frequency relationships established at the sending station.
  • the separated reference-signal components upon being combined in mixer 3d, produce a phase-reference carrier signal having a predetermined phase relation with reference to the carrier signal of oscillator i5 included in the sending station, but of twice the frequency. This may be seen from the following consideration.
  • the signals applied to mixer 312 include, among others, the carrier components of the amplitude-modulated carrier signals selected by filters 3i. and 32.
  • Such components have the frequencies fo+f1 and fry-f1 and their sum frequency, obtained in the output circuit of unit Si, is 2ft, where f0 is the operating frequency of oscillator 55.
  • the reference signal derived in unit 34 is harmonically related to the carrier component f0 of the received phasemodulated carrier signal and, specifically, the reference signal corresponds to the second harmonic of such carrier component.
  • the separated phase-modulated carrier signal is doubled in frequency by frequency multiplier 35, so
  • detector 3G by comparing therewith the phase-reference carrier signals from mixer 34, is effective to derive all of the phase-modulation components for utilization in utilizing circuit 38. Further, the amplitude-modulation components of the particular reference-signal component fof1 selected by filters! are derived in detector 31 and are also supplied to circuit 38 for utilization in any desired manner.
  • modulator 20 functions merely as an amplifier in the event that the only information to be translated between stations l0 and H comprises the signals from source I 6. ,7
  • a pair of amplitude-modulation detectors may be utilized in the receiving station II for individually deriving the amplitude-modulation components of each reference-signal component.
  • This arrangement is particularly advantageous in those applications where there i an undesired frequency distortion in the signal-translating channel.
  • a compensation may be effected.
  • the described signal-translating system may be further extended by individually modulating the reference-signal components from unit I!) with additional information desired to be translated to receiving station I I.
  • modulator 20 at sending station It may be replaced by a pair of amplitude modulators individually coupled to unit 19 through frequencyselective circuits so that one reference-signal component f0+f1 is applied to one such modulator while the other fo-Ji is applied to the other such modulator. It is then possible individually to couple a pair of different signal sources to the modulators, thereby separately to amplitudemodulate the reference-signal components with information to be translated.
  • the sending station is modified as herein suggested, corresponding modifications are necessary at receiving station H.
  • an additional amplitude-modulation detector is required to be coupled to filter 32 so that the modulation compo nents of each received amplitude-modulated reference-signal component may be derived.
  • the modified system operates substantially as hereinbefore described.
  • the graph of Fig. 2 again illustrates the frequency relations to be maintained for the signals translated by the suggested modification. Accordingly, the expression means for modulating each of the reference-signal components in accordance with additional information to be translated as used in this description and in the appended claims is intended t include the specific arrangement of Fig. l and the aforementioned modification thereof.
  • the signal outputs from filters 3i and 32 may be supplied to mixer 3 through limiter stages, adjusted to remove all amplitude modulation therefrom and thus supply to unit 34 nly signals having the frequencies fo-I-fi and fof1.
  • Such an arrangement materially reduces the filtering problem otherwise presented when the signals applied to unit 34 comprise the amplitude-modulated reference-signal components.
  • mixer 34 by combining two reference-signal components having the frequencies f0+f1 and f0f1, respectively, produces the desired phase-reference signal having the frequency ZfO.
  • This reference signal will be seen to be independent of thephase and freqency of the signal f1 utilized in generating the reference-signal components at the sending station ID.
  • signal f1 may be variously modulated without affecting the desired phase-reference signal derived at the receiving station.
  • information may be translated by amplitude modulation of the reference-signal components, as particularly described in connection with the arrangement of Fig. 1, or by modulating the angular velocity of the reference-signal components in synchronism and in opposite senses, as in the arrangement of Fig. 3 presently to be described.
  • Fig. 3 represents a modification of the sending station ll] of Fig. 1 and corresponding components thereof are identified by like reference numerals primed.
  • Sending station Iii comprises means for supplying a first signal and means for modulating the angular velocity of the first signal in accordance with information to be translated to develop a first modulated carrier signal having components predominantly in a first predetermined band of frequencies.
  • Such means are provided by an oscillator l5 having a mean operating frequency f0, a signal source I6 representing the information to be translated, and a phase modulator ll interconnected as cor- 9 responding uni-ts of sending station i I of Fig. 1- described 1 above.
  • Sending station 1 also includes a signal source It for supplying a second signal and means for modulating the angular velocity of such second signal in accordance with. additional information to'be translated to develop a second modulated carrier signal havin components predominantlyin a second predetermined band of frequencies.
  • This last-namedmeans comprises a phase modulator 24 having-input circuits individually coupled to signal source it! and to a source of phase-modulating signals 231epresenting such additional information.
  • a balanced amplitude modulator is included in sendingstation H1 havingone input circuit coupled to oscillator I and another input circuit coupled to phase modulator 2 L
  • unit l9- comprises means for amplitude-modulating the first signal, i. e. the signal from oscillator I 5", with themodulated carrier signal of.
  • a combining amplifier 22" serves to apply the phase-modulated carrier signal pro prisedin unit I? and thepair of phase-moclu lated signals produced in-unit E9 to a signaltranslating channel! for translation to the receivingstation H.
  • the frequencyfo and the modulating signals supplied from -unit 24 maywbe represented as fi-l- Af'.
  • the resulting -modulation productsobtained from the output circuit ofunit l9 are:
  • modulator 2 8 When signals from source 23 are also; to be translated, modulator 2 8 develops a secondangular-velocity-modulated carrier signal; Fig. 312; having a carrier componentofirequency f1 and. modulation components predominantly; in a sec- 0nd predetermined band of. frequencies having the limiting values oil? f1+Af' and h-Af, Where M" is the maximum deviation of signal ii in such modulation.
  • the. operation of modulator E l is similar to that of modulator l'l. However, iorthexoperating conditionsunder confi /11M? tion components .of the. pair 1 ofmodulated signals larevelocityemodulated; in synchronism and in: opposite; sensesl.
  • frequenciesof the first and second signals sup.- plifedjby unitselii' and I85, respectively are. so chpsenland .theirangulan-velocity modulation is such that thepredeterminedband .of frequencies foiAf. contairlirigw the predominant modulation.
  • FIG. 4. which comprises. a sending station, E01. having. a: construction generally similar; to. that ofsending station I; already described,- identified.-
  • Suchflmeans comprise abalanced; amplitude modulator; I961 having one;
  • a combining amplifier 22" has input circuits coupled to modulator l1" and to oscillator l5", being provided as a means for applying to a signal-translating channel 12" the pair of modulated carrier signals developed in modulator ll" and a phase-reference signal obtained from oscillator l5".
  • Receiving station H of Fig. 1 may also be utilized with sending station I to complete the signal-translating system. However, in such an arrangement the amplitude-modulation detector 31 will not be required at the receiving station and filter 33 may be sharply selective to the frequency f of oscillator l.
  • a signal from oscillator l5" having the frequency f0 and a signal from source It" having the frequency ii are modulated in unit It" producing in the output circuit thereof a signal which comprises a pair of components having the frequencies, respectively, fo+f1 and Jo-fr. Since these components are produced through an amplitude modulation process they have predetermined phase relations with reference to the signal from oscillator it as mentioned hereinbefore and the frequency relationships of such signals are as indicated by the graph of Fig. 4a.
  • the signal components from modulator 19 are phasemodulated in unit ll" information to be translated to develop a pair of angular-velocity-modulated carrier signals.
  • modulated carrier signals may be defined (fo+f1):tAf; (fof1)iAf (3) Where A) represents the maximum deviation of each carrier component. It will be apparent from expression (3) that the carrier signals are angular-velocity modulated in synchronism and in the same sense and therefore their sum frequency, as obtained in a modulator, is equal to ZfoiZAf. In other words, by combining such modulated carrier signals a third angularvelocity-modulated carrier signal is obtained which has a carrier component harmonically related to the signal from oscillator I5" and having modulation components which correspond to the modulation components of each of the pair of modulated carrier signals produced in unit H.
  • the frequency relationships indicated by the graph of Fig. 4a must be established.
  • the angular-velocity modulation in unit ll" must be such that each modulated carrier signal obtained therefrom has predominant modulation components within an individual modulation band located only in a portion of the frequency spectrum which is adjacent its carrier frequency.
  • the width of one modulation sideband of each of the pair of modulated carrier signals is to be less than the separation between the frequency f0 and the particular carrier frequency.
  • receiving station H in combining the translated pair of modulated carrier signals to derive the aforementioned third angular-velocity-modulated carrier signal and the manner of utilizing the reference signal of frequency .fo translated from oscillator I 5 will be apparent.
  • Fig. 5 represents a still further modification of in accordance with a signal-translating system in accordance with the invention, this modification being generally similar to that of Fig.4 and corresponding components are identified by like reference numerals triple primed.
  • This modification includes an oscillator 15" for supplying a first signal, a phase modulator l'i' and a source of phase-modulating signals lfi' representing information to be transmitted, interconnected as described in connection with the arrangement of Fig. l to develop a first modulated carrier signal having predominant modulation components in a predetermined band of frequencies.
  • Sending station 10 further includes means for amplitude-modulating the aforementioned first modulated carrier signal to develop a pair of angular-velocity-modulated signals described more particularly hereinafter.
  • Such means consists of a balanced amplitude modulator IQ' having an input circuit coupled to phase modulator ll and another input circuit coupled to a signal source lil which supplies a second, or modulating, signal of frequency f1.
  • station it is provided with means for supplying a third signal having predetermined phase and frequency relations with reference to the aforementioned first signal, namely, that applied to modulator l'l from oscillator l5'.
  • the third signal is derived from a second output circuit of oscillator 15 as illustrated.
  • Such third-named signal, as well as the pair of modulated signals produced in modulator l9, is applied to a signal-translating channel IZ by way of a combining amplifier 22' having input circuits individually coupled to units i5' and l9'.
  • Receiving station ll of Fig. 1 may be utilized in connection with the described sending station 3' to complete a signal-translating system, it being only necessary to modify the receiving station as above mentioned in connection with the Fig. 4 embodiment.
  • the carrier signal of frequency in supplied from oscillator l5' to modulator 17 is phase-modulated in accordance with information to be translated to develop a first angularvelocity-modulated carrier signal having predominant modulation components in a predetermined band of frequencies.
  • This modulated signal which is represented graphically in Fig. 5a, is amplitude-modulated in unit 19 with the signal supplied from source l8'.
  • the signals applied to unit I9 to be modulated may be expressed as foiAf while the modulating signal may be defined as f1.
  • the modulation products derived from unit lll are:
  • the expressions i means foreffectivelysupplying a secondsignal comprising :a pair :of signal components. and means for modulating'the angularpvelocity of said second signal to develop, ;
  • a pair of modulated carriertsignalsi as usedin the specification and in the appended claims are intendedto include both such arrangements l
  • the reference signal transmittedtfrom thesending station in both the iFigS; 4 and 5 embodiments has 1 been disclosed asan-unmodulated signal of frequency in. If desired; theautility .of either arrangement may x be enhanced :by, translating additional information as tamplitude modulation on suchreference.
  • the reference signal derived at the receiving station may be utilized asthe reference oscillations supplied. to' the zero-beat frequency-discriminator system...
  • a signal-translating system comprising, means for. supplying a first signal, means for effectively supplying a secondsignal comprising a pair of signal components having predetermined trum which is adjacent its carrier frequency;
  • the carrier component requiredas a phasereferencei signal at:
  • thereceiving station may be derived through the use. of a limiter: stage, as hereinbeforesuggested.
  • system includes means: for modulating the angular.velocity of onewof the aforesaid first. and secondtsignals in accordance with the. information to be transmittedto develop a-modulatedcarrien signal having predominant modulationcompo nents within a modulation :band; located onlyin a.
  • each system comprises a'signal-translating channel
  • phase modulation system in accordance with the teachings of this invention, reference may be had to copendingapplication serial No. 503,069, filed concurrently herewith in the name of Bernard D. Loughli and assignedto the sameassignee as the present invention.
  • .means for supplying a first signal mean for effectively supplying a second signal comprising a pair of signal components having, predetermined phase relations with reference to said first signal and being individually spaced therefrom in the frequency spectrum by equal and opposite values, means for modulating the angular velocity of one of said firstand second signals in accordance with information to be transmittedto develop a modulated carrier signal having predominant modulation components Within a modulation band located only in a portion of the frequency spectrum which is adjacent its carrier frequency, the Width of onemodulation sideband thereof be ing less than one of said 'values, a signal-trans lating channel having input and output terminals, means for applying said modulated carrier signal and the other one of said first andsecond signals to saidinput terminals, frequency-selective means coupled to saidoutputterminals for individually separating said modulated carrier meansdon supplying-a first signal, means foreffectively supplying a second signal comprising a' pair of signal components having predetermined phase relations with reference to said first signal and being individually spaced therefrom in the frequency spectrum
  • a signal-translating system comprising, means for supplying a first ignal, means for effectively upplying a second signal comprising a pair of signal components having predetermined phase relations with reference to said first signal and being individually spaced therefrom in the frequency spectrum by equal and opposite values, means for modulating the angular velocity of one of said first and second signals in accordance with information to be transmitted to develop a modulated carrier signal having predominant modulation components with a modulation band located only in a portion of the frequency spectrum which is adjacent its carrier frequency, the width of one modulation sideband thereof being less than one of said values, a signal-translating channel having input and output terminals, means for applying said modulated carrier signal and the other one of said first and second signals to said input terminals, frequency-selective means coupled to said output terminals for individually separating said modulated carrier signal and said other one of said first and second signals, means for deriving from the separated other one of said first and second signals a reference signal of substantially the same phase and frequency as the carrier component of the separated modulated
  • a signal-translating system comprising, means for supplying an angular-velocity-modulated carrier signal having modulation components determined by information to be translated and predominantly in a predetermined band of frequencies, means for supplying a pair of reference-signal components having predetermined phase relations with reference to the carrier component of said signal, the frequencies of said reference-signal components being spaced in the frequency spectrum from said carrier component by equal and opposite increments of such magnitude that said predetermined band of frequencies is located therebetween, a signal-translating channel having input and output terminals, means for applying said modulated carrier sisnal and said reference-signal components to said input terminals, frequency-selective means coupled to said output terminals for individually separating said modulated carrier signal and each of said reference-signal components, means for combining the separated reference-signal components to derive a reference carrier signal which is harmonically related to the carrier component of the separated modulated carrier signal, and means for utilizing said reference carrier signal and the separated modulated carrier signal for deriving said modulation components.
  • a signal-translating system comprising, means for supplying an angular-velocity-moolulated carrier signal having modulation components determined by information to be translated and predominantly in a predetermined band of frequencies, means for supplying a pair of reference-signal components having predetermined phase relations with reference to the carrier component of said signal, the frequencies of said reference-signal components being spaced in the frequency spectrum from said carrier component by equal and opposite increments of such magnitude that said predetermined band of frequencies is located therebetween, a signal-translating channel having input and output terminals, means for applying said modulated carrier signal and said reference-signal components to said input terminals, frequency-selective means coupled to said output terminals for individually separating said modulated carrier signal and each of said reference-signal components, means for combining said separated reference-signal components to derive a reference carrier signal which is harmonically related to the carrier component of the separated modulated carrier signal, a frequency converter, means for applying one of said carrier signals to said frequency converter to convert the frequency of the carrier component of said one carrier
  • a signal-translating system comprising, means for supplying an angular-velocity-modulated carrier signal having modulation components determined by information to be translated and predominantly in a predetermined band of frequencies, means for supplying a pair of reference-signal components having predetermined phase relations with reference to the carrier component of said signal, the frequencies of said reference-signal components being spaced in the frequency spectrum from said carrier component by equal and opposite increments of such magnitude that said predetermined band of frequencies is located therebetween, a signal-translating channel having input and output terminals, means for applying said modulated carrier signal and said reference-signal components to said input terminals, frequency-selective means coupled to said output terminals for individually separating said modulated carrier signal and each of said reference-signal components, means for combining the separated reference-signal components to derive a reference carrier signal corresponding to the second harmonic of the carrier component of the separated modulated carrier signal, a frequency doubler, means for applying said separated modulated carrier signal to said frequency doubler to double the frequency thereof, adetector
  • first-named pectrunil by'equal and opposite cans aonmodulating the angular velocoffsaid second signal in accordance withinformation to be translated todevelop a pair of modulated carrier signals each havingpredoininant lrnodulation components within an individual modulation band located only in a portion of tliePfreduency spectrum which is adjacent its carrier frequency, the Width of one modulation side": hand of each of said pair of modulated car rier signals being less than one ofsaid values, a signal-translating channel havinginput and output terminals, means for applying said firstnamed signal andsaid paifof modulated carrier signals tosaid input terminals, frequency-selec 55 tive means coupled toifsaid output terminals for individually separating said first-named signal and each of said pair
  • t liqri an me n fo su plyin a qfete i n e s idq rs simulate a e slgnel i sai etectorto derive said modul t o omp i 1 1 vaIals g l-sr m ys em compnslilg pp ng st ignal, means for ef-.
  • edu ncy spectrum py]equa1and opposite fectively supplying a second signal comprising a pair of signal components having predetermined phase relations with reference to said first signal and being individually spaced therefrom in the frequency spectrum by equal and opposite values, means for modulating the angular velocity of one of said first and second signals in accordance with information to be transmitted to develop a modulated carrier signal having predominant modulation components Within a modulation band located only in a portion of the frequency spectrum, which is adjacent its carrier frequency, the width of one modulation sideband thereof being less than one of said values, a Signal-translating channel, and means for applying to said channel said modulated carrier signal and the other one of said first and second signals.
  • a signal-translating system comprising, means for supplying a first signal, means for effectively supplying a second signal comprising a pair of signal components having predetermined phase relations with reference to said first signal and being individually spaced therefrom in the frequency spectrum by equal and opposite values, means for phase-modulating one of said first and second signals in accordance with information to be transmitted to develop a phasemodulated carrier signal having predominant modulation components within a modulation band located only in a portion of the frequency spectrum which is adjacent its carrier frequency, the width of one modulation sideband thereof being less than one of said values, a signal-translatingchannel, and means for applying to said channel said phase-modulated carrier signal and the other one of said first and second signals.
  • a signal-translating system comprising, means for supplying a first signal, means for effectively deriving from said first signal a second signal comprising a pair of signal components having predetermined phase relations with reference to said first signal and being individually spaced therefromin the, frequency spectrum by equal and opposite values, means for modulating the angular velocity of one of said first and second signals in accordance with information to be transmitted to develop a modulated carrier signal having predominant modulation components within a modulation band located only in a portion of the frequency spectrum which is adjacent its carrier frequency, the width of one modulation sideband thereof being less than one of said values, a signal-translating channel, and means for applying to said channel said modulated carrier signal and the other one of said first and second signals.
  • a signal-translating system comprising, means for supplying an angular-velocity-modulated carrier signal having modulation components determined by information to be translated and predominantly in a predetermined band of frequencies, means for supplying a pair of reference-signal components having predetermined phase relations with reference to the carrier component of said signal, the frequencies of said reference-signal components being spaced in the frequency spectrum from said carrier component by equal and opposite increments of such magnitude that said predetermined band of frequencies is located therebetween, a signal-translating channel, and means for applying to said channel said modulated carrier signal and said referencesignal components.
  • a signal-translating system comprising,
  • a signal-translating system comprising, means for supplying a first signal, means for modulating the angular velocity of said first signal in accordance with information to be translated to develop a modulated carrier signal having components predominantly in a predetermined band of frequencies, means for supplying a second signal of substantially the same phase and determined band of frequencies is located between said reference-signal components in the frequency spectrum, a signal-translating channel, and means for applying to said channel said modulated carrier signal and said reference-signal components.
  • a signal-translating system comprising, means for supplying a carrier signal, means for modulating the angular velocity of said carrier signal in accordance with information to be translated to develop a modulated carrier signal having components predominantly in a predetermined band of frequencies, means for amplitude-modulating said carrier signal to develop reference-signal components comprising upper and lower sideband components of amplitude modulation, the modulation frequency of said amplitude modulationbeing such that said predetermined band of frequencies is located between said reference-signal components in the frequency spectrum, a signal-translating channel, and means for applying to said channel said first-named modulated carrier signal and said reference-signal components.
  • a signal-translating system comprising, means for supplying a carrier signal, means for modulating the angular velocity of said carrier signal in accordance with information to be translated to develop a modulated carrier signal having components predominantly in a predetermined band of frequencies, means for supplying a modulating signal of a predetermined frequency, a balanced amplitude modulator, means for applying said carrier signal and said modulating signal to said modulator to produce reference-signal components comprising upper and lower sideband components of amplitude modulation, the frequency of said modulating signal being such that said predetermined band of frequencies is located between said reference-signal components in the frequency spectrum, a signal tially the same phase and frequency as said first signal, a signal-translating channel, and means for applying to said channel said pair of modulated signals and said third signal.
  • a signal-translating system comprising, means for supplying a first signal, means for modulating the angular velocity of said first signal in accordance with information to be translated to develop a first modulated carrier signal having predominant modulation components in a predetermined band of frequencies, means for supplying a second signal, mean for amplitudemodulating said first modulated carrier signal with said second signal to develop a pair of angular-veloci-ty-modulated signals having predetermined phase relations with reference to said first modulated carrier signal and having modulation components corresponding to those of said first modulated carrier signal but contained in different individual predetermined bands of frequencies, the frequency of said second signal being such that said first signal is located in the frequency spectrum between said different individual predetermined bands of frequencies, a signal-translating channel, and means for applying to said channel said pair of moduated' signals and said first signal.
  • a system for translating a composite signal including a first signal and a second signal which includes a pair of signal components having predetermined phase relations with reference to said first signal and individually spaced therefrom in the frequency spectrum by equal and opposite values, one of said first and second signals being angular-velocity-modulated in accordance with information to be translated so as to provide a modulated carrier signal having predominant modulation components within a modulation band located only in a portion of the frequency spectrum which is adjacent its carrier frequency, the width of one modulation sideband thereof being less than one of said values
  • a receiver comprising, a pair of input terminals for receiving said composite signal, frequencyselective means coupled to said terminals for individually separating said modulated carrier signal and said other one of said first and second signals, and means coupled to said frequencyselective means for utilizing the separated si nals to derive said modulation components.
  • a receiver comprising, a pair of input terminals for receiving said composite signal, frequencyselective means coupled to said terminals for individually separating said modulated carrier signal and said other one of said first and second signals, means for deriving from the separated other one of said first and second signals a reference signal having predetermined phase and frequency relations with reference to th carrier component ofthe separated modulated carrier signal, and means for utilizing said ref-- erence signal and said separated modulated carrier signal to derive
  • a re--- candor comprising, a pair of input terminals'forreceiving said composite signal, frequency-selective means coupled to said terminals for individually separating said modulated carrier signal and said other one of said first and second signals, means for deriving from the separated other one ence signal and said separated modulated carriersignal to derive said modulation components.
  • a receiver comprising, a pair of input terminals for receiving said composite signal, frequency-selective means coupled to said terminals for individually separating said modulated carrier signal and each of said referencesignal components, means for combining the separated reference-signal components to derive a reference carrier signal which is harmonically related to said carrier component of said modulated carrier signal, and means for utilizing said reference carrier signal and the separated modulated carrier signal for deriving said modulation components.
  • a system for translating a composite signal which includes a first signal comprising an angular-velocity-modulated carrier signal having modulation components determined by infor mation to be translated and predominantly in a predetermined band of frequencies and a second signal including a pair of reference-signal components having predetermined phase relations with reference to the carrier component of said first signal, the frequencies of said reference-signal components being spaced in the frequency spectrum from said carrier component by equal and opposite increments of such magnitude that said predetermined band of frequencies is located therebetween, a receiver comprising, a pair of in put terminals for receiving said composite signal,
  • frequency-selective means coupled to said termi.
  • carrier signal which is harmonically related to said carrier component of said modulated carrier signal
  • a frequency converter means for applying oneof said carrier signals to said frequency converter to convert the frequency of the carrier component of said one carrier signal to that of the other
  • a detector means for applying the carrier signal of converted frequency and said other carrier signal to said detector to derive said modulation components.
  • a receiver comprising, a pair of input terminals for receiving said composite signal, frequency-selective means coupled to said terminals for individually separatin said first signal and each of said pair of modulated carrier signals, means for combining the separated modulated carrier signals to derive a third angular-velocitymodulated carrier signal having a carrier component harmonically related to said first signal and havin modulation components corresponding to said modulation components of each of said pair of modulated carrier signals, and means for utilizing, the separated first signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Radar Systems Or Details Thereof (AREA)
US503071A 1943-09-20 1943-09-20 Signal-translating system Expired - Lifetime US2403385A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE473461D BE473461A (zh) 1943-09-20
US503071A US2403385A (en) 1943-09-20 1943-09-20 Signal-translating system
GB12341/44A GB588974A (en) 1943-09-20 1944-06-28 Signal-translating system
FR947380D FR947380A (fr) 1943-09-20 1947-05-30 Dispositif pour la transmission de signaux modulés en phase ou en fréquence
CH262126D CH262126A (de) 1943-09-20 1947-07-10 Anordnung zur Übertragung phasenmodulierter oder frequenzmodulierter Schwingungen.
DEP23575D DE824069C (de) 1943-09-20 1948-12-04 Anordnung zur UEbertragung phasenmodulierter oder frequenzmodulierter Fernmeldezeichen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US503071A US2403385A (en) 1943-09-20 1943-09-20 Signal-translating system

Publications (1)

Publication Number Publication Date
US2403385A true US2403385A (en) 1946-07-02

Family

ID=24000653

Family Applications (1)

Application Number Title Priority Date Filing Date
US503071A Expired - Lifetime US2403385A (en) 1943-09-20 1943-09-20 Signal-translating system

Country Status (6)

Country Link
US (1) US2403385A (zh)
BE (1) BE473461A (zh)
CH (1) CH262126A (zh)
DE (1) DE824069C (zh)
FR (1) FR947380A (zh)
GB (1) GB588974A (zh)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562703A (en) * 1947-12-26 1951-07-31 Gen Electric Multiple channel radio receiving system
US2578714A (en) * 1947-09-18 1951-12-18 Faximile Inc Sound and facsimile multiplex system
US2611826A (en) * 1947-06-05 1952-09-23 Kalfaian Meguer Simultaneous amplitude modulation and phase modulation with economy in bandwidth
US2615986A (en) * 1948-01-20 1952-10-28 Meguer V Kalfaian Phase modulation system
US2677049A (en) * 1950-07-15 1954-04-27 Rca Corp Automatic frequency control
US2927966A (en) * 1957-09-27 1960-03-08 Bell Telephone Labor Inc Carrier telephone systems with carrier-shift signaling
US3290440A (en) * 1963-03-14 1966-12-06 Roger L Easton Data transmission by variable phase with two transmitted phase reference signals
US4184046A (en) * 1978-04-06 1980-01-15 Motorola, Inc. Compatible single sideband system for AM stereo
US4185171A (en) * 1978-04-20 1980-01-22 Motorola, Inc. Compatible single sideband system for AM stereo broadcasting
US4194088A (en) * 1978-03-15 1980-03-18 The Magnavox Company Modulation monitor for AM stereophonic broadcasts

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB707027A (en) * 1952-03-24 1954-04-07 Gen Electric Co Ltd Improvements in or relating to arrangements for supplying phase modulated electric oscillations

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2611826A (en) * 1947-06-05 1952-09-23 Kalfaian Meguer Simultaneous amplitude modulation and phase modulation with economy in bandwidth
US2578714A (en) * 1947-09-18 1951-12-18 Faximile Inc Sound and facsimile multiplex system
US2562703A (en) * 1947-12-26 1951-07-31 Gen Electric Multiple channel radio receiving system
US2615986A (en) * 1948-01-20 1952-10-28 Meguer V Kalfaian Phase modulation system
US2677049A (en) * 1950-07-15 1954-04-27 Rca Corp Automatic frequency control
US2927966A (en) * 1957-09-27 1960-03-08 Bell Telephone Labor Inc Carrier telephone systems with carrier-shift signaling
US3290440A (en) * 1963-03-14 1966-12-06 Roger L Easton Data transmission by variable phase with two transmitted phase reference signals
US4194088A (en) * 1978-03-15 1980-03-18 The Magnavox Company Modulation monitor for AM stereophonic broadcasts
US4184046A (en) * 1978-04-06 1980-01-15 Motorola, Inc. Compatible single sideband system for AM stereo
US4185171A (en) * 1978-04-20 1980-01-22 Motorola, Inc. Compatible single sideband system for AM stereo broadcasting

Also Published As

Publication number Publication date
BE473461A (zh)
CH262126A (de) 1949-06-15
FR947380A (fr) 1949-06-30
DE824069C (de) 1951-12-10
GB588974A (en) 1947-06-09

Similar Documents

Publication Publication Date Title
US2403385A (en) Signal-translating system
US4726041A (en) Digital filter switch for data receiver
US3511936A (en) Multiply orthogonal system for transmitting data signals through frequency overlapping channels
US3054073A (en) Angular-velocity modulation transmitter
GB970051A (en) Compatible stereophonic transmission and reception systems,and methods and components characterizing same
US3311442A (en) Pulse transmission system employing quadrature modulation and direct current suppression
US1773116A (en) Single-side-band system
US2256317A (en) Carrier wave transmission system
US3329899A (en) Submodulation systems for carrier recreation and doppler correction in single-sideband zero-carrier communications
US3588702A (en) Transmitter for single sideband transmission bivalent of pulse
US4218586A (en) Compatible AM stereo broadcast system
US4493099A (en) FM Broadcasting system with transmitter identification
US2611036A (en) Selective sideband transmission and reception system
US3803490A (en) Transmission system for stereophonic signals
US2849537A (en) Reduction of quadrature distortion
US2672589A (en) Electric frequency modulation system of communication
US1797317A (en) Binaural phase-discrimination radio system
US1747160A (en) Single-side band-carrier system
GB784663A (en) Improvements in or relating to single-sideband radio transmission systems
US1854247A (en) Multiplex phase discrimination transmission system
US2787660A (en) Television multiplex system and apparatus
US2997577A (en) Synchronous carrier production
US1461064A (en) Multiplex transmission circuit
US2943193A (en) Synchronous detection system
US3219759A (en) System for deemphasizing and separating amplitude modulation components from a signal