GB527666A - Improvements in or relating to modulated carrier wave signalling systems - Google Patents

Improvements in or relating to modulated carrier wave signalling systems

Info

Publication number
GB527666A
GB527666A GB1172239A GB1172239A GB527666A GB 527666 A GB527666 A GB 527666A GB 1172239 A GB1172239 A GB 1172239A GB 1172239 A GB1172239 A GB 1172239A GB 527666 A GB527666 A GB 527666A
Authority
GB
United Kingdom
Prior art keywords
frequency
wave
phase
carrier
modulator
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
Application number
GB1172239A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
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 US202826A priority Critical patent/US2283575A/en
Application filed by Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB527666A publication Critical patent/GB527666A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B14/00Transmission systems not characterised by the medium used for transmission
    • H04B14/002Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/006Angle modulation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING OR REPAIRING; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00Tyre parts or constructions not otherwise provided for
    • B60C19/12Puncture preventing arrangements
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03CMODULATION
    • H03C1/00Amplitude modulation
    • H03C1/52Modulators in which carrier or one side-band are wholly or partially suppressed

Abstract

527,666. Modulating systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. April 18, 1939, No. 11722. Convention date, April 19, 1938. [Class 40 (v)] A suppressed-carrier system includes the steps of phase or frequency modulating a high-frequency oscillation by a lower-frequency wave of constant amplitude, the amount of phase-swing of the latter being varied by the signal voltage. Or the carrierwave may be phase or frequency modulated by a lower-frequency wave of constant amplitude, and the characteristic of the modulated high-frequency wave varied in accordance with the signal voltage. In both cases, the amount of phase-modulation of the carrier is so chosen that, in the characteristic energyequation, the Bessel function of zero order vanishes, giving a radiated spectrum which is substantially free of carrier-frequency. In Fig. 1 the carrier is fed from a source 1 to a modulator 3 which is coupled to an aerial or linewire 5. The modulator 3 receives the output from a phase or frequency modulator 4 fed with a lowerfrequency wave from 2 and with signals from 6. In reception the signals arriving at 7 are passed first through a wide-band tuner 8 and then to a phasemodulation detector 9, which delivers a frequencymodulated wave (similar to that impressed by 4 upon 3) to a suitably-tuned circuit 10. This, in turn, feeds a frequency-modulation detector 11, from which the original signal is passed to a loud speaker 14. It is not necessary to re-introduce the suppressed carrier-wave at the receiving end.
GB1172239A 1938-04-19 1939-04-18 Improvements in or relating to modulated carrier wave signalling systems Expired GB527666A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US202826A US2283575A (en) 1938-04-19 1938-04-19 High frequency transmission system

Publications (1)

Publication Number Publication Date
GB527666A true GB527666A (en) 1940-10-14

Family

ID=22751414

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1172239A Expired GB527666A (en) 1938-04-19 1939-04-18 Improvements in or relating to modulated carrier wave signalling systems

Country Status (3)

Country Link
US (1) US2283575A (en)
DE (1) DE713416C (en)
GB (1) GB527666A (en)

Families Citing this family (52)

* Cited by examiner, † Cited by third party
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US2709218A (en) * 1945-03-06 1955-05-24 Leonide E Gabrilovitch Method and means for anti-jamming in radio
US2508853A (en) * 1945-04-12 1950-05-23 Rca Corp Radio relaying
US2492791A (en) * 1946-04-24 1949-12-27 Rca Corp Frequency shift telegraphy
NL136716C (en) * 1946-12-10
US2579882A (en) * 1947-06-05 1951-12-25 Rca Corp Interference suppression in radio signaling systems
US2653221A (en) * 1949-12-01 1953-09-22 Zenith Radio Corp Suppressed carrier radio communication system
US2712598A (en) * 1951-05-21 1955-07-05 Patt Elavathur Sub Viswanathan Wireless broadcasting systems
US2852606A (en) * 1952-09-17 1958-09-16 Curry Paul Electrical communication systems and method of transmitting energy
US3147437A (en) * 1962-03-13 1964-09-01 Robertshaw Controls Co Single side band radio carrier retrieval system
JPH0245856B2 (en) * 1982-12-22 1990-10-12 Nippon Electric Co
US6694128B1 (en) 1998-08-18 2004-02-17 Parkervision, Inc. Frequency synthesizer using universal frequency translation technology
US7236754B2 (en) 1999-08-23 2007-06-26 Parkervision, Inc. Method and system for frequency up-conversion
US6091940A (en) 1998-10-21 2000-07-18 Parkervision, Inc. Method and system for frequency up-conversion
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
US6542722B1 (en) 1998-10-21 2003-04-01 Parkervision, Inc. Method and system for frequency up-conversion with variety of transmitter configurations
US7295826B1 (en) 1998-10-21 2007-11-13 Parkervision, Inc. Integrated frequency translation and selectivity with gain control functionality, and applications thereof
US7039372B1 (en) 1998-10-21 2006-05-02 Parkervision, Inc. Method and system for frequency up-conversion with modulation embodiments
US6560301B1 (en) 1998-10-21 2003-05-06 Parkervision, Inc. Integrated frequency translation and selectivity with a variety of filter embodiments
US7010286B2 (en) 2000-04-14 2006-03-07 Parkervision, Inc. Apparatus, system, and method for down-converting and up-converting electromagnetic signals
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
US6061555A (en) * 1998-10-21 2000-05-09 Parkervision, Inc. Method and system for ensuring reception of a communications signal
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
US6370371B1 (en) 1998-10-21 2002-04-09 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
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
US6804825B1 (en) * 1998-11-30 2004-10-12 Microsoft Corporation Video on demand methods and systems
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
US6704549B1 (en) 1999-03-03 2004-03-09 Parkvision, Inc. Multi-mode, multi-band communication system
US7110435B1 (en) 1999-03-15 2006-09-19 Parkervision, Inc. Spread spectrum applications of universal frequency translation
US7693230B2 (en) 1999-04-16 2010-04-06 Parkervision, Inc. Apparatus and method of differential IQ frequency up-conversion
US6853690B1 (en) 1999-04-16 2005-02-08 Parkervision, Inc. Method, system and apparatus for balanced frequency up-conversion of a baseband signal and 4-phase receiver and transceiver embodiments
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
US7065162B1 (en) 1999-04-16 2006-06-20 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, and transforms for same
US6963734B2 (en) 1999-12-22 2005-11-08 Parkervision, Inc. Differential frequency down-conversion using techniques of 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
US8295406B1 (en) 1999-08-04 2012-10-23 Parkervision, Inc. Universal platform module for a plurality of communication protocols
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
US7082171B1 (en) 1999-11-24 2006-07-25 Parkervision, Inc. Phase shifting applications of universal frequency translation
US7554508B2 (en) 2000-06-09 2009-06-30 Parker Vision, Inc. Phased array antenna applications on universal frequency translation
US7292835B2 (en) 2000-01-28 2007-11-06 Parkervision, Inc. Wireless and wired cable modem applications of universal frequency translation technology
US7010559B2 (en) 2000-11-14 2006-03-07 Parkervision, Inc. Method and apparatus for a 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
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
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
US7460584B2 (en) 2002-07-18 2008-12-02 Parkervision, Inc. Networking methods and systems
US7379883B2 (en) 2002-07-18 2008-05-27 Parkervision, Inc. Networking methods and systems
TWI280690B (en) * 2003-03-18 2007-05-01 Tdk Corp Electronic device for wireless communications and reflector device for wireless communication cards

Also Published As

Publication number Publication date
US2283575A (en) 1942-05-19
DE713416C (en) 1941-11-11

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