US2451430A - Carrier frequency shift signaling - Google Patents

Carrier frequency shift signaling Download PDF

Info

Publication number
US2451430A
US2451430A US664168A US66416846A US2451430A US 2451430 A US2451430 A US 2451430A US 664168 A US664168 A US 664168A US 66416846 A US66416846 A US 66416846A US 2451430 A US2451430 A US 2451430A
Authority
US
United States
Prior art keywords
frequency
oscillator
output
signal
carrier
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
US664168A
Inventor
Salvatore A Barone
Original Assignee
Jefferson Standard Broadcastin
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jefferson Standard Broadcastin filed Critical Jefferson Standard Broadcastin
Priority to US664168A priority Critical patent/US2451430A/en
Application granted granted Critical
Publication of US2451430A publication Critical patent/US2451430A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/10Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12Modulator circuits; Transmitter circuits
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03CMODULATION
    • H03C3/00Angle modulation
    • H03C3/10Angle modulation by means of variable impedance
    • H03C3/12Angle modulation by means of variable impedance by means of a variable reactive element
    • H03C3/14Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit

Description

Oct. 12, 1948. s. A. BARONE CARRIER FREQUENCY SHIFT SIGNALING Filed April 23, 1946 Space /5 M m i 5 3 mm 2 n MH 0 A 4, 7 j 4 D w Q mm W ZMW A Cm A0 a M BM R A mu 6 7 Fl MR A/Pfi 2 mm MCI r M p :DLR fl )CW ME m m 7 w Mw MT BM ON. r A m TONE KEYER Space Ma f/( /4 1N VEN TOR.

A TTOAIVEY Patented Oct. 12, 1948 UNITED i 2,451,4309; 1 CARRIER FREQUENCY I Salvatore A. Barone, Freeport; .N. -Y.,assignor, 'by

m esne assignments, to Jefierson...Standard.-; Company, a corpo ion of. North.

Broadcasting Carolina Application April 23, 1946, Serial-No. 664 468 7Claims. c1.2.; 'g

This invention relates to Wave signalling systems and more especially to systems of signalling by carrier frequency shift.

A principal object of the invention is to provide an improved method and organization of apparatus for producing frequency-shift carriers whose mean frequency is maintained at an accurately predetermined value.

Another principal object is to provide a carrier frequency-shift radio transmitter wherein a highly stable carrier frequency source such as a crystal-controlled master oscillator, is subjected to a plurality of successive frequency modulation stages in such a way that the mean frequency of the shifted output carrier frequencies is maintained equal to the frequency of said there is produced shifted carrier frequencies having. ahighly stabilized mean frequencyequal to that of said oscillator.

Another feature relates to a carrier frequencymeans to'modulate said main carrier by the frequency-shifted output of one local oscillator, and

means to frequency-shift the modulated main carrier by the frequency-shifted output of the other local oscillator. By means of suitable frequency selector circuits such as band-pass filters or the like, there are selected at the output of the system frequency-shifted carriers whose mean frequency remains equal to the frequency of [said crystal-controlled generator and is substantially independent of accidental changes in the said local oscillator circuits and associated equipment.

A further feature relates to an improved method ofshifting carrier oscillations derived from a crystal-controlled oscillator so that the output carrier has a fixed mean frequency equal to the crystal frequency, the said output mean frequency being shifted equally in opposite direcee .ri 'we e i to t r ta frequ n d corresponding. to telegraph mark and space nals or. the. like.

A.still further featurerelatesto thenovelior ganization, arrangement and relative .interconae nection of. par'tswhich cooperate to proyidegana improved. and flexible carrien frequencyi shifirg telegraph systemand thelike. 1.

Otherfeaturesand advantages not specifically enumerated will be apparent after a considera, tion of the'following detailed the appended claims.

In the drawing which shows one preferred embodiment of the invention, there isrepresented 5 by the numeral In any highlystabilized high frequency oscillator, suchas a temperature-controlled crystal oscillator, which generates the; desired master radio frequency F3 The. output frequency of the system. is indicated Has-,1. (FiZAf), where Af is preferably in the audio.- frequency range, e. g., 400 C. P. S. This output,

can then be considered as two separate carriers,

one having a frequency (F.2A,f) representing; for example a telegraph space signal; and a free, if quency (F+2Af) representing for example a'telegraph mark signal For the purpose of shifting the output frequency between the above-noted limits representing space and mark, there is provided any well-known keying device II, which produces at thepath I 2 a D. C. voltage of for example a positive polarity'and predetermined magnitude when keyed by a space signal and r a D. C. voltage of negative polarity but the same;

magnitude when keyed by a mark signal. ;It

will be understood of course, that the reverse may be true, that is, the space signal maybe repre polarity. and the mark, signal may be represented by the positive polar ity. In any event, and in accordance withlthe 1, present invention, the output of the keyer His 7 sented. by the negative divided into two paths l2, l3, and one pathis designed to produce opposite with respect to that in the cated schematically by the waves, [5.

The signal from path 12 is fed to any suitable,- reactance tube I6, so that the input voltages ape pear in the output of the tube as equivalent xreactance variations. The magnitude of these re.-, actance variations will, in the well-known way, be a function of the amplitude of thetone sig----; nal applied over path l2. ,For a detailed description of a typical reactance tube that may be used,

reference is hereby made to application Serial No. 434,498, filed March 13, 1942; which'issued April 9, 1946, as Patent No. 2,398,054. Likewise,

e. ignal i a h 1 which s ine act phase Sig descriptions and polarity of voltages,., other path as indiexample-only the higher beat' frequencynamel is select'ed for passage byfthe' bangl -pass filter 23;

opposition to the tone signal in path I2, is applied to a similar reactance tube l1.

Associated 'with the output of tube I6 is a local oscillator l8, which may be a free run- 'ning oscillator that need not be controlled to '5 the same degree of accuracy as oscillator Ill, and

which can have its output frequency varied in; accordance'with the reactance variations produced by tube I6. The local oscillator I8 may normally generate a frequency 1, which by way r of example may be thirty k. c, .The oscillatory .control circuit of oscillator ill will include the plate reactance of tube l-B sovthat as the latter is varied by the signals from path 12,:a corre-v sponding change AI is produced in the output frequency of oscillator l8. For a detailed description of one preferred manner of yarying the frequency of oscillator l8, reference may be had to said application Serial No. 434,498. Conse-' quently, there is produced an output frequency from oscillator l8 whichvis (fa-AT) represent.-w ing a telegraph mark signal, and ti jienfl' repre= senting a telegraph space signal; Itlwill beun: derstood of course; that when a mark signal is, beingkeyed at device ll, thejoscillatorxla' may-= generate the frequency (fee-inf), consequently when a space signal vis"being keyed at device H, v oscillator L8 generates'the frequency (f+AJ);..

Ina'similar manner, the reactance'tube il "l con-1 trols thefrequency of waxffree'running 'oscillator 19 which is similar to oscillator: l8, and nor mally generates a frequency 4. Likewise, theoutput of oscillator i9 is variedin frequency'between (f-fiif) and (f+AJ). 'Ho'wever; because ofthe phase opposition of the signals in paths !2 and .I l3,the frequency of oscillatorfil -is changed inth'e j opposite 'direction from-the changein frequencyof oscillator I8: for the same telegraph signal L which is" keyed at device 1H. Inother words-,-if fora space signal at device i L the oscillator l8 produces'a frequenr'zyUfl-Af) ,then simultaneously the oscillatorl9 producesai frequen'cy (fAf)-. Likewise; when oscillator l8 is producingafrequenc'y-lffinfl corresponding to a mark signal' at device ll ,oscillator l9 is producing "a fre-,

The output of oscillator l B-is connected-in balancedfdlvided'relation to any vvell-known bal anc'ed modulator -26, such'for example as'described in Radio Engineering," by Terrnan, "ls t ;edi-" tiong 'pa ge fi5l 'published by McGraw-Hill-Booi; Ce npany,lnc.;, ew Yorkylqijl."Modulator 2e isalso'fed' withthe frequency-l? from'thecry'stal oscillator l9. These two frequencies are mixed in] the 'd evice Zil inthdtvell-knbwh manner so as to produce in the outputthe sum'and difference fre 1' quencies; Inthis type of nod'ulator, the .frequencyF is suppressedinthe output? The double beatfrequenciesfrom the-modulator zeal-sap plied to a band-passfilter 2|,which passes fo i'T F+ f+Af indicatedin the drawing;

The shifted frequency frorn oscillat r {9 like: wise: fed in balanced divided relation to; another balanced modulator-2g, which is alsq fed with th Hf f) s sa item lte Be ause it j balanced modulatoraction of device 22'; the frequency F-l-(fiqf) is suppressedfin' the output. 1 However, "here are present at' this ou put two been, namelYlF-EfifiAj) (1pm 1 s "1 7 I mariner Esra. .7

One vof these lbea'ts ffor example the lower The r-let result is'that the frequeny' at the output ciated equipment.

nal such as a ,mark'vsi nal bynarrier1f menta m x ng w th sa d, frequen y F th a ma from the th of t 4- terminals of filter 23 is (F-l-ZAI) representing a space signal at device II; andlF-ZAI) representing a mark signal at device I I. It will be observed therefore, that the mean frequency F of these two output carrier frequencies always remain equal to, the said frequenc F of the master oscillator 'lfl'; and this mean frequencyremains stable notwithstanding undesired variations' in temperature, humidity and similar iconditions affecting oscillators l3 and i9 and their asso- "By the expression free running as employed inthe claims, is meant'an oscillator which can be '7 set to generate normally a particular frequency a but which frequency can be varied by means of a signal; as distinguished from a fixed frequency oscillator such as a crystal controlled oscillator.

While one particular embodiment has been de- I scribed, it will be understood that various changes and modifications may be made therein Without departing from the spirit and scope of the invei'i tioni i What is' claimed is: i 1. The method of signalling which comprises, generating a master-frequency F,'=genera ting pair of local-auxiliaryfrequencies-each of -fre quencyf, frequency-modulatingboth said l'o'ca frequencies by the same signal: but in opposite respects to produce respective side bands lfi rif) and (fir-A1), mixing the (JJz'A))' frequency 'from one local oscillator with said master" frequency F; and selecting one side band aloneemixing the i! said selected side band. -with the frequency-i (I'IM) from the other-local oscillator," amass- V lecting therefrom '-a side band "com'pone'n L (E:2Af) J, V .2. The method of transmitting a telegraph sig- V nal by carrier frequency shiftwhich? comprises, generating a master'frequencyF which 'repre 1T3 sents the mean between the lirn-its ofthe shifted' carrierfrequencies'to be transmitted, mixing wit saidmaster frequency 'a frequency "1 from a 10" free running carrier source whose frequerio shifted apredetermined amount and. direction i accordance with a telegraph signal such'asa mark signal, selecting one side band of the resulting. mixture, mixing with: said selected sideband l a carrier frequency from another idea]; ifreeii taneously shifted said predeterminedamount-uni. accordance with said signal .butiin the-opposites direction, and selecting fromthe.resulting mir ture a frequency inthe range. (FitZADWmR I T e-inethodiof transmitting ;.a tlcsrap merc shift which compr ses eneratin ree r nn ns-ca riers eac i-thelsame qua- 1 s mult n ousl hif lns he fi e n of both car ier b t in o no te frequency t o s b sa d si na ge erating amaste .-.t d' equ ncy from one of said f res r1 nine rriers a d sel ct ng on s de b u ng with sa s l c ed s de-band rrier; and se e tins efr m the'la' t: mixture the band represented by (Fi' a carrierrequency shifts sna n, a ource emaster frequenc r;

cal u ni e?qsi atorseac e ra in t e sam f eq ency f; graph signals' means responsive to a graph signal suchfasja mark signal f tan'eously shiftingifthe frequencies "of a oscillators substantially thesame amount-tut opposite frequency directions, means to mix the output of one oscillator with said master frequency F and to select one side band from the resultant mixture, means to mix said selected side band with the shifted frequency from the other local oscillator, and means to select from the last-mentioned mixture a frequency in the range (FiZAf), where Af represents the extent of frequency shift in said local oscillators.

5. In a carrier frequency shift signalling system, a source of master carrier frequency F, a telegraph tone keyer, a pair of shiftable frequency local oscillators each normally generating the same frequency f, means to apply keyed tone signals simultaneously to both said oscillators to shift their respective output frequencies substantially equal amounts but in opposite directions, a first balanced modulator which is fed with said master frequency F and with the shifted frequency from one local oscillator, means to select from the output of said first balanced modulator a sideband frequency F+(I:Af), another balanced modulator which is fed with a selected side band from the first balanced modulator and with the shifted frequency from the second local oscillator, and means to select from the output of said second balanced modulator a band represented by (FiZAf) where A represents the extent of frequency shift in said local oscillators.

6. In a carrier frequency shift signalling systerm, a source of master frequency F, a source of keyed telegraph signals, a pair of balanced modulators, a plurality of separate paths leading from said keyer respectively to said balanced modulators, each of said paths including in series a local shiftable frequency oscillator and a reactance tube, each oscillator generating normally the same frequency 1, means to vary the plate reactances of the .tubes in said paths to produce opposite frequency shifts in said local oscillators under control of said keyed signals, a selector system in the form of a band-pass filter for selecting from t pu 0 t e fir t bala ced medulator a sideband F-l-(fiAf) and a selector system in the form of a band-pass filter connected to the output of the second balanced modulator for selecting a frequency in the range (FiZAf) where M represents the extent of frequency shift in said local oscillators under control of said keyed signals.

7. In a carrier frequency shift signalling systerm, a source of master frequency F, a local shiftable frequency oscillator of normal frequency f,

. a first mixing network upon which the said master frequency F and said local oscillations are impressed said mixing network acting to suppress said frequency F, means to shift the frequency of said local oscillator over the range (fi-Af) under control of one telegraph signal, means to select from the output of said first network a frequency band F-i-(fi-Af), a second local shiftable frequency oscillator of normal frequency f, a second mixing network upon which the said frequencies F-i-(fiAf) are impressed together with the oscillations from said second oscillator, said second network acting to suppress the range of frequencies F+ (fztAf), and means to select from the output of said second network a frequency in the band (FiZAf).

SALVATORE A. BARONE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

US664168A 1946-04-23 1946-04-23 Carrier frequency shift signaling Expired - Lifetime US2451430A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US664168A US2451430A (en) 1946-04-23 1946-04-23 Carrier frequency shift signaling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US664168A US2451430A (en) 1946-04-23 1946-04-23 Carrier frequency shift signaling

Publications (1)

Publication Number Publication Date
US2451430A true US2451430A (en) 1948-10-12

Family

ID=24664857

Family Applications (1)

Application Number Title Priority Date Filing Date
US664168A Expired - Lifetime US2451430A (en) 1946-04-23 1946-04-23 Carrier frequency shift signaling

Country Status (1)

Country Link
US (1) US2451430A (en)

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2602159A (en) * 1946-06-14 1952-07-01 Collins Radio Co Frequency modulation generator
US2623952A (en) * 1950-04-01 1952-12-30 Magnetic Equipment Inc Modulating system
US2731600A (en) * 1951-04-02 1956-01-17 Edward J Stachura Communication system
US2833852A (en) * 1951-03-10 1958-05-06 Philco Corp Color signal control system for color television receivers
US6049706A (en) * 1998-10-21 2000-04-11 Parkervision, Inc. Integrated frequency translation and selectivity
US6061555A (en) * 1998-10-21 2000-05-09 Parkervision, Inc. Method and system for ensuring reception of a communications signal
US6061551A (en) * 1998-10-21 2000-05-09 Parkervision, Inc. Method and system for down-converting electromagnetic signals
US6091940A (en) * 1998-10-21 2000-07-18 Parkervision, Inc. Method and system for frequency up-conversion
US6370371B1 (en) 1998-10-21 2002-04-09 Parkervision, Inc. Applications of universal frequency translation
US6542722B1 (en) 1998-10-21 2003-04-01 Parkervision, Inc. Method and system for frequency up-conversion with variety of transmitter configurations
US6560301B1 (en) 1998-10-21 2003-05-06 Parkervision, Inc. Integrated frequency translation and selectivity with a variety of filter embodiments
US6694128B1 (en) 1998-08-18 2004-02-17 Parkervision, Inc. Frequency synthesizer using universal frequency translation technology
US6704558B1 (en) 1999-01-22 2004-03-09 Parkervision, Inc. Image-reject down-converter and embodiments thereof, such as the family radio service
US6704549B1 (en) 1999-03-03 2004-03-09 Parkvision, Inc. Multi-mode, multi-band communication system
US6813485B2 (en) 1998-10-21 2004-11-02 Parkervision, Inc. Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same
US6873836B1 (en) 1999-03-03 2005-03-29 Parkervision, Inc. Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology
US6879817B1 (en) 1999-04-16 2005-04-12 Parkervision, Inc. DC offset, re-radiation, and I/Q solutions using universal frequency translation technology
US6963734B2 (en) 1999-12-22 2005-11-08 Parkervision, Inc. Differential frequency down-conversion using techniques of universal frequency translation technology
US6975848B2 (en) 2002-06-04 2005-12-13 Parkervision, Inc. Method and apparatus for DC offset removal in a radio frequency communication channel
US7006805B1 (en) 1999-01-22 2006-02-28 Parker Vision, Inc. Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service
US7010286B2 (en) 2000-04-14 2006-03-07 Parkervision, Inc. Apparatus, system, and method for down-converting and up-converting electromagnetic signals
US7010559B2 (en) 2000-11-14 2006-03-07 Parkervision, Inc. Method and apparatus for a parallel correlator and applications thereof
US7027786B1 (en) 1998-10-21 2006-04-11 Parkervision, Inc. Carrier and clock recovery using universal frequency translation
US7039372B1 (en) 1998-10-21 2006-05-02 Parkervision, Inc. Method and system for frequency up-conversion with modulation embodiments
US7054296B1 (en) 1999-08-04 2006-05-30 Parkervision, Inc. Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation
US7072427B2 (en) 2001-11-09 2006-07-04 Parkervision, Inc. Method and apparatus for reducing DC offsets in a communication system
US7072390B1 (en) 1999-08-04 2006-07-04 Parkervision, Inc. Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments
US7082171B1 (en) 1999-11-24 2006-07-25 Parkervision, Inc. Phase shifting applications of universal frequency translation
US7085335B2 (en) 2001-11-09 2006-08-01 Parkervision, Inc. Method and apparatus for reducing DC offsets in a communication system
US7110444B1 (en) 1999-08-04 2006-09-19 Parkervision, Inc. Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations
US7110435B1 (en) 1999-03-15 2006-09-19 Parkervision, Inc. Spread spectrum applications of universal frequency translation
US7236754B2 (en) 1999-08-23 2007-06-26 Parkervision, Inc. Method and system for frequency up-conversion
US7292835B2 (en) 2000-01-28 2007-11-06 Parkervision, Inc. Wireless and wired cable modem applications of universal frequency translation technology
US7295826B1 (en) 1998-10-21 2007-11-13 Parkervision, Inc. Integrated frequency translation and selectivity with gain control functionality, and applications thereof
US7321640B2 (en) 2002-06-07 2008-01-22 Parkervision, Inc. Active polyphase inverter filter for quadrature signal generation
US20080035222A1 (en) * 2006-08-11 2008-02-14 Fraser Craig J Disposable breakaway nozzle connector
US7379883B2 (en) 2002-07-18 2008-05-27 Parkervision, Inc. Networking methods and systems
US7454453B2 (en) 2000-11-14 2008-11-18 Parkervision, Inc. Methods, systems, and computer program products for parallel correlation and applications thereof
US7460584B2 (en) 2002-07-18 2008-12-02 Parkervision, Inc. Networking methods and systems
US7515896B1 (en) 1998-10-21 2009-04-07 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships
US7554508B2 (en) 2000-06-09 2009-06-30 Parker Vision, Inc. Phased array antenna applications on universal frequency translation
US7693230B2 (en) 1999-04-16 2010-04-06 Parkervision, Inc. Apparatus and method of differential IQ frequency up-conversion
US7724845B2 (en) 1999-04-16 2010-05-25 Parkervision, Inc. Method and system for down-converting and electromagnetic signal, and transforms for same
US7773688B2 (en) 1999-04-16 2010-08-10 Parkervision, Inc. Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistors
US8295406B1 (en) 1999-08-04 2012-10-23 Parkervision, Inc. Universal platform module for a plurality of communication protocols

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1831576A (en) * 1930-10-16 1931-11-10 Christ O Petersen Anti-side slipping attachment
US2020409A (en) * 1933-08-15 1935-11-12 American Telephone & Telegraph Band separation system
US2086918A (en) * 1935-08-22 1937-07-13 Rca Corp Method of frequency or phase modulation
US2099294A (en) * 1935-09-30 1937-11-16 Telefunken Gmbh Carrier wave modulation and suppression
US2151464A (en) * 1937-07-23 1939-03-21 Wired Radio Inc Restricted frequency transmission
US2169212A (en) * 1937-01-16 1939-08-15 Edwin H Armstrong Radio transmitting system
US2228815A (en) * 1940-01-27 1941-01-14 Gen Electric Frequency conversion system
US2405765A (en) * 1942-02-12 1946-08-13 Rca Corp Radio repeater
US2407212A (en) * 1942-06-16 1946-09-03 Rca Corp Radio relaying

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1831576A (en) * 1930-10-16 1931-11-10 Christ O Petersen Anti-side slipping attachment
US2020409A (en) * 1933-08-15 1935-11-12 American Telephone & Telegraph Band separation system
US2086918A (en) * 1935-08-22 1937-07-13 Rca Corp Method of frequency or phase modulation
US2099294A (en) * 1935-09-30 1937-11-16 Telefunken Gmbh Carrier wave modulation and suppression
US2169212A (en) * 1937-01-16 1939-08-15 Edwin H Armstrong Radio transmitting system
US2151464A (en) * 1937-07-23 1939-03-21 Wired Radio Inc Restricted frequency transmission
US2228815A (en) * 1940-01-27 1941-01-14 Gen Electric Frequency conversion system
US2405765A (en) * 1942-02-12 1946-08-13 Rca Corp Radio repeater
US2407212A (en) * 1942-06-16 1946-09-03 Rca Corp Radio relaying

Cited By (107)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2602159A (en) * 1946-06-14 1952-07-01 Collins Radio Co Frequency modulation generator
US2623952A (en) * 1950-04-01 1952-12-30 Magnetic Equipment Inc Modulating system
US2833852A (en) * 1951-03-10 1958-05-06 Philco Corp Color signal control system for color television receivers
US2731600A (en) * 1951-04-02 1956-01-17 Edward J Stachura Communication system
US6694128B1 (en) 1998-08-18 2004-02-17 Parkervision, Inc. Frequency synthesizer using universal frequency translation technology
US6560301B1 (en) 1998-10-21 2003-05-06 Parkervision, Inc. Integrated frequency translation and selectivity with a variety of filter embodiments
US6061551A (en) * 1998-10-21 2000-05-09 Parkervision, Inc. Method and system for down-converting electromagnetic signals
US6091940A (en) * 1998-10-21 2000-07-18 Parkervision, Inc. Method and system for frequency up-conversion
US6266518B1 (en) 1998-10-21 2001-07-24 Parkervision, Inc. Method and system for down-converting electromagnetic signals by sampling and integrating over apertures
US6353735B1 (en) 1998-10-21 2002-03-05 Parkervision, Inc. MDG method for output signal generation
US6370371B1 (en) 1998-10-21 2002-04-09 Parkervision, Inc. Applications of universal frequency translation
US6421534B1 (en) 1998-10-21 2002-07-16 Parkervision, Inc. Integrated frequency translation and selectivity
US6542722B1 (en) 1998-10-21 2003-04-01 Parkervision, Inc. Method and system for frequency up-conversion with variety of transmitter configurations
US6061555A (en) * 1998-10-21 2000-05-09 Parkervision, Inc. Method and system for ensuring reception of a communications signal
US6580902B1 (en) 1998-10-21 2003-06-17 Parkervision, Inc. Frequency translation using optimized switch structures
US6647250B1 (en) 1998-10-21 2003-11-11 Parkervision, Inc. Method and system for ensuring reception of a communications signal
US6687493B1 (en) 1998-10-21 2004-02-03 Parkervision, Inc. Method and circuit for down-converting a signal using a complementary FET structure for improved dynamic range
US6049706A (en) * 1998-10-21 2000-04-11 Parkervision, Inc. Integrated frequency translation and selectivity
US7321735B1 (en) 1998-10-21 2008-01-22 Parkervision, Inc. Optical down-converter using universal frequency translation technology
US7245886B2 (en) 1998-10-21 2007-07-17 Parkervision, Inc. Method and system for frequency up-conversion with modulation embodiments
US6798351B1 (en) 1998-10-21 2004-09-28 Parkervision, Inc. Automated meter reader applications of universal frequency translation
US6813485B2 (en) 1998-10-21 2004-11-02 Parkervision, Inc. Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same
US6836650B2 (en) 1998-10-21 2004-12-28 Parkervision, Inc. Methods and systems for down-converting electromagnetic signals, and applications thereof
US7376410B2 (en) 1998-10-21 2008-05-20 Parkervision, Inc. Methods and systems for down-converting a signal using a complementary transistor structure
US8340618B2 (en) 1998-10-21 2012-12-25 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships
US8233855B2 (en) 1998-10-21 2012-07-31 Parkervision, Inc. Up-conversion based on gated information signal
US7218907B2 (en) 1998-10-21 2007-05-15 Parkervision, Inc. Method and circuit for down-converting a signal
US7389100B2 (en) 1998-10-21 2008-06-17 Parkervision, Inc. Method and circuit for down-converting a signal
US8190108B2 (en) 1998-10-21 2012-05-29 Parkervision, Inc. Method and system for frequency up-conversion
US8160534B2 (en) 1998-10-21 2012-04-17 Parkervision, Inc. Applications of universal frequency translation
US7016663B2 (en) 1998-10-21 2006-03-21 Parkervision, Inc. Applications of universal frequency translation
US7027786B1 (en) 1998-10-21 2006-04-11 Parkervision, Inc. Carrier and clock recovery using universal frequency translation
US7039372B1 (en) 1998-10-21 2006-05-02 Parkervision, Inc. Method and system for frequency up-conversion with modulation embodiments
US7050508B2 (en) 1998-10-21 2006-05-23 Parkervision, Inc. Method and system for frequency up-conversion with a variety of transmitter configurations
US8019291B2 (en) 1998-10-21 2011-09-13 Parkervision, Inc. Method and system for frequency down-conversion and frequency up-conversion
US7937059B2 (en) 1998-10-21 2011-05-03 Parkervision, Inc. Converting an electromagnetic signal via sub-sampling
US7936022B2 (en) 1998-10-21 2011-05-03 Parkervision, Inc. Method and circuit for down-converting a signal
US7076011B2 (en) 1998-10-21 2006-07-11 Parkervision, Inc. Integrated frequency translation and selectivity
US7865177B2 (en) 1998-10-21 2011-01-04 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships
US7826817B2 (en) 1998-10-21 2010-11-02 Parker Vision, Inc. Applications of universal frequency translation
US7295826B1 (en) 1998-10-21 2007-11-13 Parkervision, Inc. Integrated frequency translation and selectivity with gain control functionality, and applications thereof
US7697916B2 (en) 1998-10-21 2010-04-13 Parkervision, Inc. Applications of universal frequency translation
US7693502B2 (en) 1998-10-21 2010-04-06 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, transforms for same, and aperture relationships
US7620378B2 (en) 1998-10-21 2009-11-17 Parkervision, Inc. Method and system for frequency up-conversion with modulation embodiments
US7194246B2 (en) 1998-10-21 2007-03-20 Parkervision, Inc. Methods and systems for down-converting a signal using a complementary transistor structure
US7529522B2 (en) 1998-10-21 2009-05-05 Parkervision, Inc. Apparatus and method for communicating an input signal in polar representation
US8190116B2 (en) 1998-10-21 2012-05-29 Parker Vision, Inc. Methods and systems for down-converting a signal using a complementary transistor structure
US7515896B1 (en) 1998-10-21 2009-04-07 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships
US7308242B2 (en) 1998-10-21 2007-12-11 Parkervision, Inc. Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same
US6704558B1 (en) 1999-01-22 2004-03-09 Parkervision, Inc. Image-reject down-converter and embodiments thereof, such as the family radio service
US7006805B1 (en) 1999-01-22 2006-02-28 Parker Vision, Inc. Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service
US6873836B1 (en) 1999-03-03 2005-03-29 Parkervision, Inc. Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology
US6704549B1 (en) 1999-03-03 2004-03-09 Parkvision, Inc. Multi-mode, multi-band communication system
US7483686B2 (en) 1999-03-03 2009-01-27 Parkervision, Inc. Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology
US7110435B1 (en) 1999-03-15 2006-09-19 Parkervision, Inc. Spread spectrum applications of universal frequency translation
US7599421B2 (en) 1999-03-15 2009-10-06 Parkervision, Inc. Spread spectrum applications of universal frequency translation
US7894789B2 (en) 1999-04-16 2011-02-22 Parkervision, Inc. Down-conversion of an electromagnetic signal with feedback control
US6879817B1 (en) 1999-04-16 2005-04-12 Parkervision, Inc. DC offset, re-radiation, and I/Q solutions using universal frequency translation technology
US7693230B2 (en) 1999-04-16 2010-04-06 Parkervision, Inc. Apparatus and method of differential IQ frequency up-conversion
US7724845B2 (en) 1999-04-16 2010-05-25 Parkervision, Inc. Method and system for down-converting and electromagnetic signal, and transforms for same
US7190941B2 (en) 1999-04-16 2007-03-13 Parkervision, Inc. Method and apparatus for reducing DC offsets in communication systems using universal frequency translation technology
US8229023B2 (en) 1999-04-16 2012-07-24 Parkervision, Inc. Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments
US8224281B2 (en) 1999-04-16 2012-07-17 Parkervision, Inc. Down-conversion of an electromagnetic signal with feedback control
US8223898B2 (en) 1999-04-16 2012-07-17 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, and transforms for same
US8594228B2 (en) 1999-04-16 2013-11-26 Parkervision, Inc. Apparatus and method of differential IQ frequency up-conversion
US8077797B2 (en) 1999-04-16 2011-12-13 Parkervision, Inc. Method, system, and apparatus for balanced frequency up-conversion of a baseband signal
US8036304B2 (en) 1999-04-16 2011-10-11 Parkervision, Inc. Apparatus and method of differential IQ frequency up-conversion
US7773688B2 (en) 1999-04-16 2010-08-10 Parkervision, Inc. Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistors
US7224749B2 (en) 1999-04-16 2007-05-29 Parkervision, Inc. Method and apparatus for reducing re-radiation using techniques of universal frequency translation technology
US7272164B2 (en) 1999-04-16 2007-09-18 Parkervision, Inc. Reducing DC offsets using spectral spreading
US7539474B2 (en) 1999-04-16 2009-05-26 Parkervision, Inc. DC offset, re-radiation, and I/Q solutions using universal frequency translation technology
US7929638B2 (en) 1999-04-16 2011-04-19 Parkervision, Inc. Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments
US8295406B1 (en) 1999-08-04 2012-10-23 Parkervision, Inc. Universal platform module for a plurality of communication protocols
US7072390B1 (en) 1999-08-04 2006-07-04 Parkervision, Inc. Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments
US7054296B1 (en) 1999-08-04 2006-05-30 Parkervision, Inc. Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation
US7653145B2 (en) 1999-08-04 2010-01-26 Parkervision, Inc. Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations
US7110444B1 (en) 1999-08-04 2006-09-19 Parkervision, Inc. Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations
US7236754B2 (en) 1999-08-23 2007-06-26 Parkervision, Inc. Method and system for frequency up-conversion
US7546096B2 (en) 1999-08-23 2009-06-09 Parkervision, Inc. Frequency up-conversion using a harmonic generation and extraction module
US7082171B1 (en) 1999-11-24 2006-07-25 Parkervision, Inc. Phase shifting applications of universal frequency translation
US7379515B2 (en) 1999-11-24 2008-05-27 Parkervision, Inc. Phased array antenna applications of universal frequency translation
US6963734B2 (en) 1999-12-22 2005-11-08 Parkervision, Inc. Differential frequency down-conversion using techniques of universal frequency translation technology
US7292835B2 (en) 2000-01-28 2007-11-06 Parkervision, Inc. Wireless and wired cable modem applications of universal frequency translation technology
US7496342B2 (en) 2000-04-14 2009-02-24 Parkervision, Inc. Down-converting electromagnetic signals, including controlled discharge of capacitors
US8295800B2 (en) 2000-04-14 2012-10-23 Parkervision, Inc. Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor
US7386292B2 (en) 2000-04-14 2008-06-10 Parkervision, Inc. Apparatus, system, and method for down-converting and up-converting electromagnetic signals
US7010286B2 (en) 2000-04-14 2006-03-07 Parkervision, Inc. Apparatus, system, and method for down-converting and up-converting electromagnetic signals
US7218899B2 (en) 2000-04-14 2007-05-15 Parkervision, Inc. Apparatus, system, and method for up-converting electromagnetic signals
US7107028B2 (en) 2000-04-14 2006-09-12 Parkervision, Inc. Apparatus, system, and method for up converting electromagnetic signals
US7822401B2 (en) 2000-04-14 2010-10-26 Parkervision, Inc. Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor
US7554508B2 (en) 2000-06-09 2009-06-30 Parker Vision, Inc. Phased array antenna applications on universal frequency translation
US7233969B2 (en) 2000-11-14 2007-06-19 Parkervision, Inc. Method and apparatus for a parallel correlator and applications thereof
US7433910B2 (en) 2000-11-14 2008-10-07 Parkervision, Inc. Method and apparatus for the parallel correlator and applications thereof
US7454453B2 (en) 2000-11-14 2008-11-18 Parkervision, Inc. Methods, systems, and computer program products for parallel correlation and applications thereof
US7991815B2 (en) 2000-11-14 2011-08-02 Parkervision, Inc. Methods, systems, and computer program products for parallel correlation and applications thereof
US7010559B2 (en) 2000-11-14 2006-03-07 Parkervision, Inc. Method and apparatus for a parallel correlator and applications thereof
US7085335B2 (en) 2001-11-09 2006-08-01 Parkervision, Inc. Method and apparatus for reducing DC offsets in a communication system
US7072427B2 (en) 2001-11-09 2006-07-04 Parkervision, Inc. Method and apparatus for reducing DC offsets in a communication system
US7653158B2 (en) 2001-11-09 2010-01-26 Parkervision, Inc. Gain control in a communication channel
US8446994B2 (en) 2001-11-09 2013-05-21 Parkervision, Inc. Gain control in a communication channel
US6975848B2 (en) 2002-06-04 2005-12-13 Parkervision, Inc. Method and apparatus for DC offset removal in a radio frequency communication channel
US7321640B2 (en) 2002-06-07 2008-01-22 Parkervision, Inc. Active polyphase inverter filter for quadrature signal generation
US8160196B2 (en) 2002-07-18 2012-04-17 Parkervision, Inc. Networking methods and systems
US7460584B2 (en) 2002-07-18 2008-12-02 Parkervision, Inc. Networking methods and systems
US8407061B2 (en) 2002-07-18 2013-03-26 Parkervision, Inc. Networking methods and systems
US7379883B2 (en) 2002-07-18 2008-05-27 Parkervision, Inc. Networking methods and systems
US20080035222A1 (en) * 2006-08-11 2008-02-14 Fraser Craig J Disposable breakaway nozzle connector

Similar Documents

Publication Publication Date Title
US2157122A (en) Warning system for indicating the proximity of aircraft
US2802208A (en) Radio frequency multiplexing
US3908090A (en) Compatible AM stereophonic transmission system
US2283575A (en) High frequency transmission system
US2298409A (en) Multiplexing
GB1079928A (en) A data transmission system
US2462841A (en) Frequency-stabilizing system
GB983337A (en) Improvements in or relating to transmission systems for the transmission of pulse signals
US2392546A (en) Pulse modulation receiver
KR960032944A (en) Transmitters and transceivers
US2498678A (en) Multiplex electrical pulse communication system
GB1041777A (en) Radio direction finding receiver equipment
US2103847A (en) Signaling
CA1318013C (en) Decorrelation tolerant coherent radio altimeter
US6560297B1 (en) Image rejection downconverter for a translation loop modulator
US2419593A (en) Two-way radio communication system
US3384824A (en) Phase quadrature transmission system with receiver detectors controlled in response to presence of pilot waves appearing as crosstalk
US1983079A (en) Method and means for use in navigation
US3132339A (en) Sideband cancellation system
US2541076A (en) Multichannel pulse communicating system
US3182259A (en) Submodulation systems for carrier recreation and doppler correction in single-sideband zero-carrier communications
GB594532A (en) Improvement in omnidirectional radio navigation-aiding systems
US1773116A (en) Single-side-band system
US2428118A (en) Pulse multiplex system
US2960573A (en) Electric carrier current communication systems