GB1151614A - Improvements in or relating to Electric Signal Receivers - Google Patents

Improvements in or relating to Electric Signal Receivers

Info

Publication number
GB1151614A
GB1151614A GB858267A GB858267A GB1151614A GB 1151614 A GB1151614 A GB 1151614A GB 858267 A GB858267 A GB 858267A GB 858267 A GB858267 A GB 858267A GB 1151614 A GB1151614 A GB 1151614A
Authority
GB
United Kingdom
Prior art keywords
filters
filter
binary data
frequency shift
feb
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
GB858267A
Inventor
Clive Roland Warburton
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB858267A priority Critical patent/GB1151614A/en
Publication of GB1151614A publication Critical patent/GB1151614A/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
    • H04L27/10—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
    • H04L27/148—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using filters, including PLL-type filters

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

1,151,614. Data transmission systems; V.F. signalling. GENERAL ELECTRIC & ENGLISH ELECTRIC COMPANIES Ltd. 8 Feb., 1968 [22 Feb., 1967], No. 8582/67. Headings H4P and H4R. In a frequency shift binary data receiver in which the binary data may be represented by either of two pairs of frequencies, two filters are connected in parallel, one or other filter being shorted out depending on which pair of frequencies is being received. The frequency shift signals pass via a filter 1 and emitter follower 3 to the two filters 5, 6. The amplifier is matched to the filters by resistors 16, 17. Transistors 22, 23 are selectively enabled to short the input of the corresponding filter. The filters feed mixer 8 via amplifier 7. The mixer feeds a band-pass filter connected to a limiter which feeds a tuned circuit. This develops a frequency shift signal whose amplitude varies with frequency. A rectifier derives the binary data from this signal.
GB858267A 1967-02-22 1967-02-22 Improvements in or relating to Electric Signal Receivers Expired GB1151614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB858267A GB1151614A (en) 1967-02-22 1967-02-22 Improvements in or relating to Electric Signal Receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB858267A GB1151614A (en) 1967-02-22 1967-02-22 Improvements in or relating to Electric Signal Receivers

Publications (1)

Publication Number Publication Date
GB1151614A true GB1151614A (en) 1969-05-14

Family

ID=9855239

Family Applications (1)

Application Number Title Priority Date Filing Date
GB858267A Expired GB1151614A (en) 1967-02-22 1967-02-22 Improvements in or relating to Electric Signal Receivers

Country Status (1)

Country Link
GB (1) GB1151614A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478901A1 (en) * 1980-03-18 1981-09-25 Jeumont Schneider HIGHER AMPLITUDE ALTERNATING SIGNAL SELECTION STAGE AMONG TWO DIFFERENT FREQUENCY SIGNALS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478901A1 (en) * 1980-03-18 1981-09-25 Jeumont Schneider HIGHER AMPLITUDE ALTERNATING SIGNAL SELECTION STAGE AMONG TWO DIFFERENT FREQUENCY SIGNALS
WO1981002714A1 (en) * 1980-03-18 1981-10-01 Jeumont Schneider Selection stage of the ac signal having the greater amplitude
US4488238A (en) * 1980-03-18 1984-12-11 Jeumont-Schneider Corporation Selection stage of the AC signal of greater amplitude between two signals of different frequencies

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Legal Events

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