GB1172977A - Improvements in or relating to Demodulation Systems - Google Patents

Improvements in or relating to Demodulation Systems

Info

Publication number
GB1172977A
GB1172977A GB3625269A GB3625269A GB1172977A GB 1172977 A GB1172977 A GB 1172977A GB 3625269 A GB3625269 A GB 3625269A GB 3625269 A GB3625269 A GB 3625269A GB 1172977 A GB1172977 A GB 1172977A
Authority
GB
United Kingdom
Prior art keywords
components
relating
nov
differential
produce
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
GB3625269A
Inventor
Ralph Bertrand Herman
William Renwick
Leonard Charles Walters
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.)
Plessey Co Ltd
Original Assignee
Plessey 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
Application filed by Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB3625269A priority Critical patent/GB1172977A/en
Priority claimed from GB49825/65A external-priority patent/GB1172974A/en
Publication of GB1172977A publication Critical patent/GB1172977A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
    • H04L27/152—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements
    • H04L27/1525—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements using quadrature demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
    • H04L27/2014—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes in a piecewise linear manner during each symbol period, e.g. minimum shift keying, fast frequency shift keying
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26

Abstract

1,172,977. Demodulators. PLESSEY CO. Ltd. 23 Nov., 1966 [23 Nov., 1965], No. 36252/69. Divided out of 1,172,974. Headings H3A and H3Q. In a demodulator of the type in which a modulated signal is multiplied by quadrature components of a locally generated carrier to produce two message components, the two components are fed to an inverse function generator which multiplies the first by the differential of the second, the second by the differential of the first, and then subtracts one product from the others to produce the required message signal.
GB3625269A 1965-11-23 1965-11-23 Improvements in or relating to Demodulation Systems Expired GB1172977A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3625269A GB1172977A (en) 1965-11-23 1965-11-23 Improvements in or relating to Demodulation Systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3625269A GB1172977A (en) 1965-11-23 1965-11-23 Improvements in or relating to Demodulation Systems
GB49825/65A GB1172974A (en) 1965-11-23 1965-11-23 Improvements in or relating to Modulation Systems

Publications (1)

Publication Number Publication Date
GB1172977A true GB1172977A (en) 1969-12-03

Family

ID=26263046

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3625269A Expired GB1172977A (en) 1965-11-23 1965-11-23 Improvements in or relating to Demodulation Systems

Country Status (1)

Country Link
GB (1) GB1172977A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711476A1 (en) * 1976-03-16 1977-09-22 Plessey Handel Investment Ag DUPLEX TRANSMITTER / RECEIVER DEVICE WORKING IN A COMMON CHANNEL
FR2482804A1 (en) * 1980-05-16 1981-11-20 Plessey Overseas RADIO RECEIVER WITH FREQUENCY MODULATION
DE3132233A1 (en) * 1980-08-23 1982-06-24 Plessey Overseas Ltd., Ilford, Essex "BROADCAST RECEIVER"
DE3139136A1 (en) * 1981-10-01 1983-04-14 Siemens AG, 1000 Berlin und 8000 München Device for determining the frequency of alternating electrical quantities, particularly of a rotating-field machine
GB2143386A (en) * 1983-07-14 1985-02-06 Standard Telephones Cables Ltd Radio receiver
GB2148669A (en) * 1983-10-21 1985-05-30 Philips Electronic Associated Data receiver
US4628518A (en) * 1981-08-20 1986-12-09 Plessey Overseas Limited Radio receiver
RU1841299C (en) * 1974-08-16 2022-05-18 Акционерное общество "Центральный научно-исследовательский радиотехнический институт имени академика А.И. Берга" Method for receiving a phase modulated signal

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU1841299C (en) * 1974-08-16 2022-05-18 Акционерное общество "Центральный научно-исследовательский радиотехнический институт имени академика А.И. Берга" Method for receiving a phase modulated signal
DE2711476A1 (en) * 1976-03-16 1977-09-22 Plessey Handel Investment Ag DUPLEX TRANSMITTER / RECEIVER DEVICE WORKING IN A COMMON CHANNEL
FR2345013A1 (en) * 1976-03-16 1977-10-14 Plessey Handel Investment Ag COMMON CHANNEL DUPLEX TRANSCEIVER
FR2482804A1 (en) * 1980-05-16 1981-11-20 Plessey Overseas RADIO RECEIVER WITH FREQUENCY MODULATION
DE3132233A1 (en) * 1980-08-23 1982-06-24 Plessey Overseas Ltd., Ilford, Essex "BROADCAST RECEIVER"
US4628518A (en) * 1981-08-20 1986-12-09 Plessey Overseas Limited Radio receiver
DE3139136A1 (en) * 1981-10-01 1983-04-14 Siemens AG, 1000 Berlin und 8000 München Device for determining the frequency of alternating electrical quantities, particularly of a rotating-field machine
GB2143386A (en) * 1983-07-14 1985-02-06 Standard Telephones Cables Ltd Radio receiver
GB2148669A (en) * 1983-10-21 1985-05-30 Philips Electronic Associated Data receiver

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Legal Events

Date Code Title Description
PS Patent sealed
PE Patent expired