FR2610156B1 - APPARATUS FOR TWO-WAY COMMUNICATION IN UNDERGROUND FACILITIES - Google Patents

APPARATUS FOR TWO-WAY COMMUNICATION IN UNDERGROUND FACILITIES

Info

Publication number
FR2610156B1
FR2610156B1 FR8800580A FR8800580A FR2610156B1 FR 2610156 B1 FR2610156 B1 FR 2610156B1 FR 8800580 A FR8800580 A FR 8800580A FR 8800580 A FR8800580 A FR 8800580A FR 2610156 B1 FR2610156 B1 FR 2610156B1
Authority
FR
France
Prior art keywords
way communication
underground facilities
underground
facilities
communication
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 - Lifetime
Application number
FR8800580A
Other languages
French (fr)
Other versions
FR2610156A1 (en
Inventor
Antti Berg
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.)
Outokumpu Oyj
Original Assignee
Outokumpu Oyj
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 Outokumpu Oyj filed Critical Outokumpu Oyj
Publication of FR2610156A1 publication Critical patent/FR2610156A1/en
Application granted granted Critical
Publication of FR2610156B1 publication Critical patent/FR2610156B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Radio Transmission System (AREA)
  • Transmitters (AREA)
FR8800580A 1987-01-22 1988-01-20 APPARATUS FOR TWO-WAY COMMUNICATION IN UNDERGROUND FACILITIES Expired - Lifetime FR2610156B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI870286A FI77131C (en) 1987-01-22 1987-01-22 Device for providing bi-directional communication in underground spaces

Publications (2)

Publication Number Publication Date
FR2610156A1 FR2610156A1 (en) 1988-07-29
FR2610156B1 true FR2610156B1 (en) 1994-06-10

Family

ID=8523819

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8800580A Expired - Lifetime FR2610156B1 (en) 1987-01-22 1988-01-20 APPARATUS FOR TWO-WAY COMMUNICATION IN UNDERGROUND FACILITIES

Country Status (5)

Country Link
JP (1) JPH07118680B2 (en)
DE (1) DE3741866C2 (en)
FI (1) FI77131C (en)
FR (1) FR2610156B1 (en)
GB (1) GB2200270B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3942320A1 (en) * 1989-10-10 1991-04-11 Wk Elektronik Gmbh Communication system esp. for salt mine - uses single frequency phase locked loop radio system at base stations connected by wire to central station

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3825829A (en) * 1973-01-29 1974-07-23 Motorola Inc Radio system employing simultaneously triggered pulse repeaters
JPS599041B2 (en) * 1976-10-05 1984-02-29 三菱電機株式会社 thin film mirror
JPS54123819A (en) * 1978-03-17 1979-09-26 Kiyoshi Takizawa Under soil or water signal transmitter
JPS5726942A (en) * 1980-07-25 1982-02-13 Tokyo Gas Co Ltd Data transmission system
GB2083977B (en) * 1980-08-26 1984-08-22 Standard Telephones Cables Ltd Single channel duplex radio system
GB2109197B (en) * 1981-10-13 1985-12-04 Standard Telephones Cables Ltd Radio system
US4777652A (en) * 1982-07-27 1988-10-11 A.R.F. Products Radio communication systems for underground mines
FR2538645B1 (en) * 1982-12-28 1986-04-11 Thomson Csf METHOD AND DEVICE FOR INTERPOLATING SPEECH IN A DIGITAL SPEECH TRANSMISSION SYSTEM

Also Published As

Publication number Publication date
DE3741866A1 (en) 1988-08-04
FI870286A (en) 1988-07-23
JPS63194425A (en) 1988-08-11
FI77131C (en) 1989-01-10
GB2200270B (en) 1991-06-26
FR2610156A1 (en) 1988-07-29
DE3741866C2 (en) 1997-04-03
GB8729449D0 (en) 1988-02-03
FI870286A0 (en) 1987-01-22
FI77131B (en) 1988-09-30
GB2200270A (en) 1988-07-27
JPH07118680B2 (en) 1995-12-18

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