GB1507335A - Fm demodulators - Google Patents

Fm demodulators

Info

Publication number
GB1507335A
GB1507335A GB3939475A GB3939475A GB1507335A GB 1507335 A GB1507335 A GB 1507335A GB 3939475 A GB3939475 A GB 3939475A GB 3939475 A GB3939475 A GB 3939475A GB 1507335 A GB1507335 A GB 1507335A
Authority
GB
United Kingdom
Prior art keywords
output
circuit
counter
converter
pulse
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
GB3939475A
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.)
Siemens SpA
Original Assignee
Siemens SpA
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 Siemens SpA filed Critical Siemens SpA
Priority to GB3939475A priority Critical patent/GB1507335A/en
Publication of GB1507335A publication Critical patent/GB1507335A/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
    • H03D3/04—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by counting or integrating cycles of oscillations

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

1507335 Binary FSK demodulators; data transmission SOC ITALIANA TELECOMUNICAZIONI SIEMENS SpA 25 Sept 1975 39394/75 Headings H3A and H4P A binary FSK demodulator comprises an input filter F 1 , a squaring circuit SQ, a circuit QD responsive to each zero-crossing of the input signal applied via SQ to provide a first pulse at 1 to enable a memory MR to store the contents of a counter CN connected to count clock pulses from TR and a second pulse at 2 to subsequently reset the counter, the demodulated output being derived via a digital to analog converter DA and a threshold circuit CT. The output of converter DA consists of two distinct voltage levels from which the two keying frequencies are obtained at the output of the threshold device CT. Power supply variations are compensated by making the output of converter DA and the reference voltage V, applied to CT dependent on the supply. The counting period of counter CN may be made equal or less than half period of the input signal. The circuit QD may include as in Fig. 2 (not shown) a two stage shift register and other logic gates.
GB3939475A 1975-09-25 1975-09-25 Fm demodulators Expired GB1507335A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3939475A GB1507335A (en) 1975-09-25 1975-09-25 Fm demodulators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3939475A GB1507335A (en) 1975-09-25 1975-09-25 Fm demodulators

Publications (1)

Publication Number Publication Date
GB1507335A true GB1507335A (en) 1978-04-12

Family

ID=10409319

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3939475A Expired GB1507335A (en) 1975-09-25 1975-09-25 Fm demodulators

Country Status (1)

Country Link
GB (1) GB1507335A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201868A (en) * 1987-03-04 1988-09-07 Nat Semiconductor Corp Second-order carrier/symbol synchronizer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201868A (en) * 1987-03-04 1988-09-07 Nat Semiconductor Corp Second-order carrier/symbol synchronizer
GB2201868B (en) * 1987-03-04 1991-08-14 Nat Semiconductor Corp Second-order carrier/symbol synchronizer

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Legal Events

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