GB695350A - Improvements in and relating to electrical communication systems - Google Patents

Improvements in and relating to electrical communication systems

Info

Publication number
GB695350A
GB695350A GB5506/52A GB550652A GB695350A GB 695350 A GB695350 A GB 695350A GB 5506/52 A GB5506/52 A GB 5506/52A GB 550652 A GB550652 A GB 550652A GB 695350 A GB695350 A GB 695350A
Authority
GB
United Kingdom
Prior art keywords
frequency
carrier
modulated
signal
sub
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
GB5506/52A
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.)
Maxar Space LLC
Original Assignee
Philco Ford Corp
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 Philco Ford Corp filed Critical Philco Ford Corp
Publication of GB695350A publication Critical patent/GB695350A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/165—Ground-based stations employing angle modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)

Abstract

695,350. Multiplex radio signalling; frequency modulation. PHILCO CORPORATION. March 3, 1952 [March 30, 1951], No. 5506/52. Class 40 (v). In a communication system employing a carrier wave frequency-modulated by a composite signal comprising a frequency-modulated sub-carrier and an amplitude-modulated component extending over a frequency-range different from that of the sub-carrier, spurious phase modulation of the latter in a superheterodyne receiver by the amplitude modulated signal, due to the phase/frequency characteristic of the receiver I.F. amplifier not being linear, is counteracted by causing the local oscillator to track the incoming signal for frequencies within the signal (audio) modulation band of the sub-carrier. As shown applied to a television system with a carrier frequency modulated by a video signal and a frequencymodulated sub-carrier for sound, the output of a receiver frequency discriminator 24 is passed through a low-pass amplifier 26, passing up to 30 kc/s., to frequency-modulate approximately in step the local oscillator 21, and the therefore suppressed low-frequency video components are reintroduced into the output signal from the amplifier 26 in a combiner circuit 28, preferably with a delay, produced by a network 30, equal to that produced by the I.F. amplifier 22.
GB5506/52A 1951-03-30 1952-03-03 Improvements in and relating to electrical communication systems Expired GB695350A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US695350XA 1951-03-30 1951-03-30

Publications (1)

Publication Number Publication Date
GB695350A true GB695350A (en) 1953-08-05

Family

ID=22089641

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5506/52A Expired GB695350A (en) 1951-03-30 1952-03-03 Improvements in and relating to electrical communication systems

Country Status (1)

Country Link
GB (1) GB695350A (en)

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