GB1172976A - Improvements in or relating to Modulation Systems - Google Patents

Improvements in or relating to Modulation Systems

Info

Publication number
GB1172976A
GB1172976A GB3110169A GB3110169A GB1172976A GB 1172976 A GB1172976 A GB 1172976A GB 3110169 A GB3110169 A GB 3110169A GB 3110169 A GB3110169 A GB 3110169A GB 1172976 A GB1172976 A GB 1172976A
Authority
GB
United Kingdom
Prior art keywords
message
squarewave
message function
waveform
nov
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
GB3110169A
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 GB3110169A priority Critical patent/GB1172976A/en
Priority claimed from GB49825/65A external-priority patent/GB1172974A/en
Publication of GB1172976A publication Critical patent/GB1172976A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/38—Angle modulation by converting amplitude modulation to angle modulation
    • H03C3/40—Angle modulation by converting amplitude modulation to angle modulation using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits
    • 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
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

1,172,976. Frequency and amplitude modulation. PLESSEY CO. Ltd. 23 Nov., 1966 [23 Nov., 1965], No. 31101/69. Divided out of 1,172,974. Heading H3R. In a quadrature modulator of the type in which two message function components are multiplied at 3, 4 by quadrature components sin # 0 t, cos # o t of a carrier and then added at 5, the message function component generator comprises: means 27 for generating a squarewave C(t) having a period equal to twice the digit period of the message waveform; means 28 for filtering the squarewave C(t) to produce a sine wave which constitutes one of the message function components; means 25 for multiplying the squarewave C(t) by the message waveform M(t); and means 29 for filtering the product waveform to produce the second message function compound.
GB3110169A 1965-11-23 1965-11-23 Improvements in or relating to Modulation Systems Expired GB1172976A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3110169A GB1172976A (en) 1965-11-23 1965-11-23 Improvements in or relating to Modulation Systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3110169A GB1172976A (en) 1965-11-23 1965-11-23 Improvements in or relating to Modulation Systems
GB49825/65A GB1172974A (en) 1965-11-23 1965-11-23 Improvements in or relating to Modulation Systems

Publications (1)

Publication Number Publication Date
GB1172976A true GB1172976A (en) 1969-12-03

Family

ID=26260738

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3110169A Expired GB1172976A (en) 1965-11-23 1965-11-23 Improvements in or relating to Modulation Systems

Country Status (1)

Country Link
GB (1) GB1172976A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees