US2358152A - Phase and frequency modulation system - Google Patents
Phase and frequency modulation system Download PDFInfo
- Publication number
- US2358152A US2358152A US460578A US46057842A US2358152A US 2358152 A US2358152 A US 2358152A US 460578 A US460578 A US 460578A US 46057842 A US46057842 A US 46057842A US 2358152 A US2358152 A US 2358152A
- Authority
- US
- United States
- Prior art keywords
- frequency
- phase
- modulator
- wave
- output
- 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
Links
- 230000010355 oscillation Effects 0.000 description 8
- 230000010363 phase shift Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000035559 beat frequency Effects 0.000 description 4
- 238000010009 beating Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
Definitions
- the present invention relates to an-arrangement for the conversion of frequency modular tion tophase modulation and vice versa, andthe application thereof to the ⁇ productionof a frequencymodulated. wave from a frequency stable oscillator such as a crystal controlled oscillator.
- An ultimate object of the invention is to'provide a simple and 'economic arrangement for producing a frequency modulated wave of large excursiOn, that is, a large range; between the limits of ⁇ frequency variation, from a frequency stable oscillator such as a crystal controlled oscillator.
- an arrangement for the conversion of frequency modulation to phase modulation of stable frequency comprises ra first modulator to which the frequency modulated wave and the stablefrequency are'fed and a second modulator to which are fed the frequency modulated waves and one of the side bands in the output fromsaid first modulator, the paths between the source of phase modulated waves and said second modulator being so'designed as to have a linear frequency versusdifferential phase shift char- ⁇ acteristic, the-output of said second,v modulator bfeing passedI through a filter designed' to pass 'said stable'frequency.
- an arrangement for the conversion of a phase modulated wave to a frequency modulated vwave comprises a modulator and a .circuit arrangement for producing a frequency linearly variable in accordancewith the phase of said phasemodulatedv wave; said phase modulated wave and -said variablefreguency being fed to said modalator f or producing theV frequency modulated wave, said circuit arrangement comprising a second modulator to which are fed one of the sidebands of the output of the first-mentioned modulator and the unmodulated frequency of the phase modulated wave, the beat frequency in the output of saidV second modulator being fed to the input of said first modulator, the feed-back path together to a rst modulator for producing in the output thereof the frequency modulated wave, the arrangement for producing said variable frequency comprising a second modulator to which are fed one of the side-bands of ,the
- the beat frequency in the output'of said second modulator being fed to the inputof said first modulator, the feed-back path of said first modulator :thus formed being designed to have a total ⁇ phase delay .linearly variable with frequency. l.
- phase modulated wave of stable frequency isr first produced-by the modulating wave and the phase modulated wave is then converted to a frequency modulated wave by an arrangement according to the above features of the invention.
- Fig. 2 a circuity forproducing a frequency modulated wave and utilising the arrangement shown in Fig.v 1 ⁇ for first producing a phase modulated wave.
- a source of frequency modulated waves is shown at A, ⁇
- the wave energy from A is fed along two paths,4
- the amount of phase modulation of the output from M2 or lter X2 is determined by the differential delay between the two signal paths between A and M2, and delay devices may be inserted in the direct path from Ato M2, between A and MI or between
- the delay network DI (or XI) is such that a linear'r phase shift of 0 radians penn cycles is introduced inthe path from Ml to M2 and may, of course, be comprised bythe filter XI.
- Output from the oscillator O is'also fed to the modulator M4 where it is modulated by one of Vthe side bands [Fifinll whose frequency is dependent upon the phase'modulation and isfobtained as described later via a filter X4 of mean pass frequency (F-l-f) or (F-f)
- the output of M4 contains the frequency (fj- A) which is passed by the 1 filter X3 of mean-pass frequency f and fed to the Vmodulator' M3, which asalready stated is also supplied with the phase ⁇ modulated frequency F.
- the output from M3 thus includes the side 6 bands FUM yone of which, e. g.
- F-(fiA) vis passed by the filter X4 and isthe frequency modulated wave required and is of mean frequency F f in the example.
- Part of the outputof X4 is, as already stated, fed back to the modulator M4.
- a delay network D2 is shown between X3 and M3 but, as in the case of Fig. 1 this represents ciently great oscillations are set up and these must be of mean frequency f in order to pass' through filter X3 and (F-f) in the example to ship for oscillation round the loop has now been upset and the frequency f will rise or fall to accommodate itself to the new conditions. For instance, if the phase of -the injected frequency F into M3 is advanced with respect to the direct injection of the same frequency from O into M4,
- a phase delay network may be used to make the'total phase shift of the feedback path linear with frequency or the filters X3 and X4 .may be properly designed in known manner to carry out this funcoscillations can only be maintained in the loop if the frequency f is increasedto (f-l-A) and the frequency (F-f) to lF-(f-
- a system for producing a frequency modulated wave-of stable'mean frequency which comprises a source ofA stable frequency,'means to phase modulate the frequency from said' source,
- a first modulator means ⁇ to deliver the phase modulated wave to said first modulator
- a second j v modulator means to impress the stable frequency from said source on said second modulator
- a system for the conversion of a phase modulated wave to a frequency modulated wave which comprises a first modulator, means to deliver a phase modulated wave to said first modulator, a source of stable frequency at the frequency of said modulated-wave, a second lm6duiator;rnevans*A ⁇ -to impress on said secondniodulator"ajportioiifof the energy from said vsource of 'stable frequency,A means to impress a ,portion of the output of said first modulator on said second modulator, means to impress the output of said second modulatorv on said first modulator, means to provide a total phasedelay linearly with lfrequency between said second modulator and said first modulator, and means to utilize a remaining portion of the outmodulating a portion of said wave,v beating said phase modulated wave with a wave having a frequency linearly variable in accordance with the phase of said phase modulated wave, beating a portion of the resultant modulated wave with another portion of said stable frequency wave, delaying the phase of the
Landscapes
- Amplitude Modulation (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5358/41A GB556208A (en) | 1941-04-25 | 1941-04-25 | Arrangement for conversion of frequency modulation to phase modulation and the application thereof to the production of a frequency modulated wave from a frequency stable oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2358152A true US2358152A (en) | 1944-09-12 |
Family
ID=9794597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US460578A Expired - Lifetime US2358152A (en) | 1941-04-25 | 1942-10-02 | Phase and frequency modulation system |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2358152A (fr) |
| FR (1) | FR932831A (fr) |
| GB (1) | GB556208A (fr) |
Cited By (52)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2491969A (en) * | 1945-10-25 | 1949-12-20 | Fr Sadir Carpentier Soc | Electric signal transmission system |
| US2499014A (en) * | 1944-03-17 | 1950-02-28 | Radio Electr Soc Fr | Frequency modulating system |
| US2567203A (en) * | 1946-02-05 | 1951-09-11 | Marcel J E Golay | Multiplex communication system utilizing successive, different pulse modulation techniques |
| US2620468A (en) * | 1949-04-14 | 1952-12-02 | Radio Electr Soc Fr | Arrangement for converting frequency-modulated waves |
| US2914670A (en) * | 1955-12-30 | 1959-11-24 | Beckman Instruments Inc | Frequency selective circuit |
| US2920289A (en) * | 1956-09-11 | 1960-01-05 | Lab For Electronics Inc | Signal modulating apparatus |
| US3017583A (en) * | 1958-06-06 | 1962-01-16 | Raytheon Co | Large angle rf phase shifters |
| US3054073A (en) * | 1958-03-27 | 1962-09-11 | Rca Corp | Angular-velocity modulation transmitter |
| US3118117A (en) * | 1959-10-30 | 1964-01-14 | Int Standard Electric Corp | Modulators for carrier communication systems |
| US3263019A (en) * | 1964-03-18 | 1966-07-26 | Hurvitz Hyman | Randomization of phases and frequencies of musical spectra |
| US3813617A (en) * | 1972-02-28 | 1974-05-28 | Radiodiffusion Television Off | Frequency to amplitude modulated wave converter |
| US6049706A (en) * | 1998-10-21 | 2000-04-11 | Parkervision, Inc. | Integrated frequency translation and selectivity |
| US6061551A (en) * | 1998-10-21 | 2000-05-09 | Parkervision, Inc. | Method and system for down-converting electromagnetic signals |
| US6061555A (en) * | 1998-10-21 | 2000-05-09 | Parkervision, Inc. | Method and system for ensuring reception of a communications signal |
| US6091940A (en) * | 1998-10-21 | 2000-07-18 | Parkervision, Inc. | Method and system for frequency up-conversion |
| US20010027561A1 (en) * | 1998-11-30 | 2001-10-04 | Microsoft Corporation | Video on demand methods and systems |
| 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 |
| US7010559B2 (en) | 2000-11-14 | 2006-03-07 | Parkervision, Inc. | Method and apparatus for a parallel correlator and applications thereof |
| US7010286B2 (en) | 2000-04-14 | 2006-03-07 | Parkervision, Inc. | Apparatus, system, and method for down-converting and up-converting electromagnetic signals |
| 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 |
| US7072390B1 (en) | 1999-08-04 | 2006-07-04 | Parkervision, Inc. | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments |
| US7072427B2 (en) | 2001-11-09 | 2006-07-04 | Parkervision, Inc. | Method and apparatus for reducing DC offsets in a communication system |
| 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 |
| US7110435B1 (en) | 1999-03-15 | 2006-09-19 | Parkervision, Inc. | Spread spectrum applications of universal frequency translation |
| 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 |
| 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 |
| 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2525048A1 (fr) * | 1982-04-09 | 1983-10-14 | Thomson Csf | Dispositif de modulation en amplitude, en frequence ou en phase |
-
1941
- 1941-04-25 GB GB5358/41A patent/GB556208A/en not_active Expired
-
1942
- 1942-10-02 US US460578A patent/US2358152A/en not_active Expired - Lifetime
-
1946
- 1946-08-27 FR FR932831D patent/FR932831A/fr not_active Expired
Cited By (115)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2499014A (en) * | 1944-03-17 | 1950-02-28 | Radio Electr Soc Fr | Frequency modulating system |
| US2491969A (en) * | 1945-10-25 | 1949-12-20 | Fr Sadir Carpentier Soc | Electric signal transmission system |
| US2567203A (en) * | 1946-02-05 | 1951-09-11 | Marcel J E Golay | Multiplex communication system utilizing successive, different pulse modulation techniques |
| US2620468A (en) * | 1949-04-14 | 1952-12-02 | Radio Electr Soc Fr | Arrangement for converting frequency-modulated waves |
| US2914670A (en) * | 1955-12-30 | 1959-11-24 | Beckman Instruments Inc | Frequency selective circuit |
| US2920289A (en) * | 1956-09-11 | 1960-01-05 | Lab For Electronics Inc | Signal modulating apparatus |
| US3054073A (en) * | 1958-03-27 | 1962-09-11 | Rca Corp | Angular-velocity modulation transmitter |
| US3017583A (en) * | 1958-06-06 | 1962-01-16 | Raytheon Co | Large angle rf phase shifters |
| US3118117A (en) * | 1959-10-30 | 1964-01-14 | Int Standard Electric Corp | Modulators for carrier communication systems |
| US3263019A (en) * | 1964-03-18 | 1966-07-26 | Hurvitz Hyman | Randomization of phases and frequencies of musical spectra |
| US3813617A (en) * | 1972-02-28 | 1974-05-28 | Radiodiffusion Television Off | Frequency to amplitude modulated wave converter |
| US6694128B1 (en) | 1998-08-18 | 2004-02-17 | Parkervision, Inc. | Frequency synthesizer using universal frequency translation technology |
| 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 |
| US7620378B2 (en) | 1998-10-21 | 2009-11-17 | Parkervision, Inc. | Method and system for frequency up-conversion with modulation embodiments |
| 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 |
| US7389100B2 (en) | 1998-10-21 | 2008-06-17 | Parkervision, Inc. | Method and circuit for down-converting a signal |
| 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 |
| US6560301B1 (en) | 1998-10-21 | 2003-05-06 | Parkervision, Inc. | Integrated frequency translation and selectivity with a variety of filter embodiments |
| 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 |
| US6061551A (en) * | 1998-10-21 | 2000-05-09 | Parkervision, Inc. | Method and system for down-converting electromagnetic signals |
| US7321735B1 (en) | 1998-10-21 | 2008-01-22 | Parkervision, Inc. | Optical down-converter using universal frequency translation technology |
| 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 |
| 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 |
| US20050009494A1 (en) * | 1998-10-21 | 2005-01-13 | Parkervision, Inc. | Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same |
| US7295826B1 (en) | 1998-10-21 | 2007-11-13 | Parkervision, Inc. | Integrated frequency translation and selectivity with gain control functionality, 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 |
| US8233855B2 (en) | 1998-10-21 | 2012-07-31 | Parkervision, Inc. | Up-conversion based on gated information signal |
| US8190108B2 (en) | 1998-10-21 | 2012-05-29 | Parkervision, Inc. | Method and system for frequency up-conversion |
| 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 |
| US8190116B2 (en) | 1998-10-21 | 2012-05-29 | Parker Vision, Inc. | Methods and systems for down-converting a signal using a complementary transistor structure |
| 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 |
| US7697916B2 (en) | 1998-10-21 | 2010-04-13 | Parkervision, Inc. | Applications of universal frequency translation |
| US7245886B2 (en) | 1998-10-21 | 2007-07-17 | Parkervision, Inc. | Method and system for frequency up-conversion with modulation embodiments |
| 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 |
| US6061555A (en) * | 1998-10-21 | 2000-05-09 | Parkervision, Inc. | Method and system for ensuring reception of a communications signal |
| 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 |
| US7218907B2 (en) | 1998-10-21 | 2007-05-15 | Parkervision, Inc. | Method and circuit for down-converting a signal |
| US6049706A (en) * | 1998-10-21 | 2000-04-11 | Parkervision, Inc. | Integrated frequency translation and selectivity |
| US20090221257A1 (en) * | 1998-10-21 | 2009-09-03 | Parkervision, Inc. | Method and System For Down-Converting An Electromagnetic Signal, And Transforms For Same, And Aperture Relationships |
| US20010027561A1 (en) * | 1998-11-30 | 2001-10-04 | Microsoft Corporation | Video on demand methods and systems |
| 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 |
| US6704558B1 (en) | 1999-01-22 | 2004-03-09 | Parkervision, Inc. | Image-reject down-converter and embodiments thereof, such as the family radio service |
| 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 |
| 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 |
| US7599421B2 (en) | 1999-03-15 | 2009-10-06 | Parkervision, Inc. | Spread spectrum applications of universal frequency translation |
| US7110435B1 (en) | 1999-03-15 | 2006-09-19 | Parkervision, Inc. | Spread spectrum applications of universal frequency translation |
| US7224749B2 (en) | 1999-04-16 | 2007-05-29 | Parkervision, Inc. | Method and apparatus for reducing re-radiation using techniques of universal frequency translation technology |
| US8224281B2 (en) | 1999-04-16 | 2012-07-17 | Parkervision, Inc. | Down-conversion of an electromagnetic signal with feedback control |
| US8594228B2 (en) | 1999-04-16 | 2013-11-26 | Parkervision, Inc. | Apparatus and method of differential IQ frequency up-conversion |
| US6879817B1 (en) | 1999-04-16 | 2005-04-12 | Parkervision, Inc. | DC offset, re-radiation, and I/Q solutions using universal frequency translation technology |
| 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 |
| US7724845B2 (en) | 1999-04-16 | 2010-05-25 | Parkervision, Inc. | Method and system for down-converting and electromagnetic signal, and transforms for same |
| US8229023B2 (en) | 1999-04-16 | 2012-07-24 | Parkervision, Inc. | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments |
| 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 |
| US7894789B2 (en) | 1999-04-16 | 2011-02-22 | 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 |
| US7272164B2 (en) | 1999-04-16 | 2007-09-18 | Parkervision, Inc. | Reducing DC offsets using spectral spreading |
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Also Published As
| Publication number | Publication date |
|---|---|
| GB556208A (en) | 1943-09-24 |
| FR932831A (fr) | 1948-04-02 |
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