GB1530151A - Frequency discriminators - Google Patents

Frequency discriminators

Info

Publication number
GB1530151A
GB1530151A GB110475A GB110475A GB1530151A GB 1530151 A GB1530151 A GB 1530151A GB 110475 A GB110475 A GB 110475A GB 110475 A GB110475 A GB 110475A GB 1530151 A GB1530151 A GB 1530151A
Authority
GB
United Kingdom
Prior art keywords
output
frequency
centre frequency
pulse
input signal
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
GB110475A
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 GB110475A priority Critical patent/GB1530151A/en
Publication of GB1530151A publication Critical patent/GB1530151A/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
    • H03D3/18—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of synchronous gating arrangements
    • H03D3/20—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of synchronous gating arrangements producing pulses whose amplitude or duration depends on phase difference
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0001—Circuit elements of demodulators
    • H03D2200/0039—Exclusive OR logic circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

1530151 Frequency detection GENERAL ELECTRIC CO Ltd 12 Jan 1976 [10 Jan 1975] 1104/75 Heading G4H [Also in Division H3] A frequency discriminator suitable for detecting signals selectively at one of two frequencies comprises a multi-stage shift register 1 to which is applied an input signal having positive and negative portions represented by respective trains of like binary digits, an arrangement 3 for stepping the digits along the register 1 at a higher rate, two detectors 6, 13 connected to the register 1 and spaced apart by a distance corresponding to half the period of the input centre frequency, each for detecting a transition between the two type of trains and an arrangement 19-51, e.g. a bistable-logic gate circuitry, responsive to the detector outputs for providing a pulse output which varies in pulse duration and/or pulse repetition rate in accordance with the deviation of the input signal from its centre frequency. The pulse output may be applied (Fig. 2, not shown) via a gating circuit to a low pass filter and a zero-crossing detector to obtain an analogue output. A NAND gate 20 prevents an output being produced when the input signal is at the centre frequency. An output is provided at terminal 52 or 53 in dependence upon whether the instantaneous frequency is below or above the centre frequency. In operation, the bistable circuit 27 is set and reset by the output of a corresponding one of the detectors 6, 13 so that the output of 27 has a duration and a repetition rate dependent on the amount of deviation from the centre frequency.
GB110475A 1976-01-12 1976-01-12 Frequency discriminators Expired GB1530151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB110475A GB1530151A (en) 1976-01-12 1976-01-12 Frequency discriminators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB110475A GB1530151A (en) 1976-01-12 1976-01-12 Frequency discriminators

Publications (1)

Publication Number Publication Date
GB1530151A true GB1530151A (en) 1978-10-25

Family

ID=9716226

Family Applications (1)

Application Number Title Priority Date Filing Date
GB110475A Expired GB1530151A (en) 1976-01-12 1976-01-12 Frequency discriminators

Country Status (1)

Country Link
GB (1) GB1530151A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2550675A1 (en) * 1983-07-25 1985-02-15 Gen Electric DISCRIMINATOR CIRCUIT AND METHOD OF OPERATING THE SAME
EP1022847A2 (en) * 1998-09-22 2000-07-26 Micro Analog Systems OY FM demodulator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2550675A1 (en) * 1983-07-25 1985-02-15 Gen Electric DISCRIMINATOR CIRCUIT AND METHOD OF OPERATING THE SAME
EP1022847A2 (en) * 1998-09-22 2000-07-26 Micro Analog Systems OY FM demodulator
EP1022847A3 (en) * 1998-09-22 2002-01-02 Micro Analog Systems OY FM demodulator

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee