Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L7/00—Arrangements for synchronising receiver with transmitter
  • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
  • H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B47/00—Survey of boreholes or wells
  • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
  • E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
  • E21B47/18—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
  • E21B47/20—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry by modulation of mud waves, e.g. by continuous modulation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L7/00—Arrangements for synchronising receiver with transmitter
  • H04L7/0079—Receiver details
  • H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Life Sciences & Earth Sciences (AREA)
• Mining & Mineral Resources (AREA)
• Geology (AREA)
• Geophysics (AREA)
• Computer Networks & Wireless Communication (AREA)
• Fluid Mechanics (AREA)
• Remote Sensing (AREA)
• Acoustics & Sound (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Environmental & Geological Engineering (AREA)
• Signal Processing (AREA)
• Synchronisation In Digital Transmission Systems (AREA)
• Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
• Communication Control (AREA)
• Indicating And Signalling Devices For Elevators (AREA)
• Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24748755

Family Applications (1)

Country Status (15)

• 1977
  • 1977-04-28 IE IE860/77A patent/IE45139B1/en unknown
  • 1977-04-29 NO NO771514A patent/NO771514L/no unknown
  • 1977-05-04 AU AU24860/77A patent/AU513642B2/en not_active Expired
  • 1977-05-04 FR FR7713487A patent/FR2351549A1/fr active Granted
  • 1977-05-05 BR BR7702901A patent/BR7702901A/pt unknown
  • 1977-05-06 IT IT23295/77A patent/IT1101653B/it active
  • 1977-05-07 EG EG267/77A patent/EG13329A/xx active
  • 1977-05-09 AR AR267532A patent/AR222004A1/es active
  • 1977-05-09 CA CA000277997A patent/CA1119686A/en not_active Expired
  • 1977-05-09 GB GB19325/77A patent/GB1579488A/en not_active Expired
  • 1977-05-09 ES ES458606A patent/ES458606A1/es not_active Expired
  • 1977-05-10 NL NL7705119A patent/NL7705119A/xx not_active Application Discontinuation
  • 1977-05-10 GR GR53425A patent/GR63199B/el unknown
  • 1977-05-10 OA OA56165A patent/OA05657A/xx unknown
  • 1977-05-10 DE DE19772721023 patent/DE2721023A1/de not_active Withdrawn

Also Published As

Similar Documents