GB1454924A - Modulation systems for the production of frequency-shift keyed signals - Google Patents

Modulation systems for the production of frequency-shift keyed signals

Info

Publication number
GB1454924A
GB1454924A GB2787174A GB2787174A GB1454924A GB 1454924 A GB1454924 A GB 1454924A GB 2787174 A GB2787174 A GB 2787174A GB 2787174 A GB2787174 A GB 2787174A GB 1454924 A GB1454924 A GB 1454924A
Authority
GB
United Kingdom
Prior art keywords
frequency
production
june
modulation systems
shift keyed
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
GB2787174A
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 AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of GB1454924A publication Critical patent/GB1454924A/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
    • H04L27/12—Modulator circuits; Transmitter circuits
    • H04L27/122—Modulator circuits; Transmitter circuits using digital generation of carrier signals

Landscapes

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

Abstract

1454924 Data transmission; f.s.k. modulators SIEMENS AG 24 June 1974 [29 June 1973] 27871/74 Heading H4P A f.s.k. modulator has for each binary valve a different frequency square wave oscillator feeding into a fixed frequency divider through a gating circuit controlled by binary signal input. The gating circuit may comprise NAND gates N1-N3 and inverter I1 and the frequency divider may comprise a dual circuit counter 21, 22. It is stated that phase discontinuities on change from one frequency to another are reduced in proportion to the total division ratio, i.e. in the case of a counter, discontinuity is halved at each successive stage F1, F2 &c.
GB2787174A 1973-06-29 1974-06-24 Modulation systems for the production of frequency-shift keyed signals Expired GB1454924A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732333253 DE2333253A1 (en) 1973-06-29 1973-06-29 MODULATOR FOR GENERATING FREQUENCY MODULATED SIGNALS

Publications (1)

Publication Number Publication Date
GB1454924A true GB1454924A (en) 1976-11-10

Family

ID=5885534

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2787174A Expired GB1454924A (en) 1973-06-29 1974-06-24 Modulation systems for the production of frequency-shift keyed signals

Country Status (9)

Country Link
BE (1) BE817046A (en)
CH (1) CH571295A5 (en)
DE (1) DE2333253A1 (en)
DK (1) DK335174A (en)
FR (1) FR2235554B1 (en)
GB (1) GB1454924A (en)
IT (1) IT1015490B (en)
NL (1) NL7408531A (en)
SE (1) SE7408490L (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417332A (en) * 1965-02-11 1968-12-17 Nasa Frequency shift keying apparatus
US3663754A (en) * 1970-05-18 1972-05-16 Totuus Communications Inc Communication system having modulator for generating orthogonal continuous phase synchronous binary fsk

Also Published As

Publication number Publication date
FR2235554A1 (en) 1975-01-24
NL7408531A (en) 1974-12-31
FR2235554B1 (en) 1977-03-11
DK335174A (en) 1975-03-24
IT1015490B (en) 1977-05-10
DE2333253A1 (en) 1975-01-23
SE7408490L (en) 1974-12-30
CH571295A5 (en) 1975-12-31
BE817046A (en) 1974-12-30

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed