GB953247A - Improvements in or relating to voice frequency telegraphy equipment - Google Patents

Improvements in or relating to voice frequency telegraphy equipment

Info

Publication number
GB953247A
GB953247A GB525862A GB525862A GB953247A GB 953247 A GB953247 A GB 953247A GB 525862 A GB525862 A GB 525862A GB 525862 A GB525862 A GB 525862A GB 953247 A GB953247 A GB 953247A
Authority
GB
United Kingdom
Prior art keywords
channel
distortion
voice
feed
frequency
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
GB525862A
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.)
Tesla AS
Original Assignee
Tesla AS
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 Tesla AS filed Critical Tesla AS
Publication of GB953247A publication Critical patent/GB953247A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation
    • H04L1/248—Distortion measuring systems

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

953,247. Telegraphy. TESLA NARODNI PODNIK. Feb. 12, 1962 [Feb. 14, 1961], No. 5258/62. Drawings to Specification. Heading H4P. In a voice-frequency telegraph system means is provided for monitoring the telegraph distortion whereby the system may be adjusted to reduce the distortion. The output of the transmitter at one end of the voice-frequency channel is connected to the receiver at the same end of the channel, and the receiver output is connected as positive feed-back to the transmitter modulator input. Oscillations develop in the feedback loop, and have a bit-frequency close to the maximum speed of the channel. The feed-back loop includes a centre-zero meter which indicates the presence of distortion. When the receiver discriminator is adjusted until the meter reads zero the distortion is zero, i.e. the mark-space ratio is 1: 1. After the transmitterreceiver at the other end of the channel has been adjusted in a similar way the two terminal stations are interconnected so as to cause positive feed-back, and this results in oscillation of approximately half the maximum speed of the channel. A meter in this feed-back loop monitors the distortion in the voice-frequency channel, facilitating adjustment thereof.
GB525862A 1961-02-14 1962-02-12 Improvements in or relating to voice frequency telegraphy equipment Expired GB953247A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS85161 1961-02-14

Publications (1)

Publication Number Publication Date
GB953247A true GB953247A (en) 1964-03-25

Family

ID=5341471

Family Applications (1)

Application Number Title Priority Date Filing Date
GB525862A Expired GB953247A (en) 1961-02-14 1962-02-12 Improvements in or relating to voice frequency telegraphy equipment

Country Status (1)

Country Link
GB (1) GB953247A (en)

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