ZA737683B - Method for varying the frequencies of a communication signal - Google Patents

Method for varying the frequencies of a communication signal

Info

Publication number
ZA737683B
ZA737683B ZA737683A ZA737683A ZA737683B ZA 737683 B ZA737683 B ZA 737683B ZA 737683 A ZA737683 A ZA 737683A ZA 737683 A ZA737683 A ZA 737683A ZA 737683 B ZA737683 B ZA 737683B
Authority
ZA
South Africa
Prior art keywords
frequencies
varying
communication signal
communication
signal
Prior art date
Application number
ZA737683A
Inventor
Itt Ind Inc
Ind Inc Itt
Original Assignee
Itt
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 Itt filed Critical Itt
Publication of ZA737683B publication Critical patent/ZA737683B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/087—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Electromechanical Clocks (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
ZA737683A 1972-10-07 1973-10-01 Method for varying the frequencies of a communication signal ZA737683B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2249257A DE2249257A1 (en) 1972-10-07 1972-10-07 PROCEDURE FOR CHANGING THE FREQUENCIES OF A MESSAGE SIGNAL

Publications (1)

Publication Number Publication Date
ZA737683B true ZA737683B (en) 1974-08-28

Family

ID=5858443

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA737683A ZA737683B (en) 1972-10-07 1973-10-01 Method for varying the frequencies of a communication signal

Country Status (6)

Country Link
JP (1) JPS4974407A (en)
DE (1) DE2249257A1 (en)
FR (1) FR2202401B1 (en)
GB (1) GB1444810A (en)
IT (1) IT1003145B (en)
ZA (1) ZA737683B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU169185B (en) * 1974-06-05 1976-10-28
GB2151886A (en) * 1983-12-21 1985-07-24 British Broadcasting Corp Conditional-access broadcast transmission
WO2007049200A1 (en) 2005-10-24 2007-05-03 Koninklijke Philips Electronics N.V. A device for and a method of audio data processing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444396A (en) * 1965-03-24 1969-05-13 Rca Corp Signal translating circuit providing signal-controlled time delay
US3559103A (en) * 1965-10-05 1971-01-26 Duane H Cooper Method of delay modulation
AU459101B2 (en) * 1972-02-10 1975-03-20 Matsushita Electric Industrial Co., Ltd. Samplling modulation system for an electronic misical instrument
US3749837A (en) * 1972-05-02 1973-07-31 J Doughty Electronic musical tone modifier for musical instruments

Also Published As

Publication number Publication date
GB1444810A (en) 1976-08-04
FR2202401A1 (en) 1974-05-03
IT1003145B (en) 1976-06-10
JPS4974407A (en) 1974-07-18
FR2202401B1 (en) 1977-03-11
DE2249257A1 (en) 1974-04-11

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