GB1120346A - Improvements in or relating to noise loading test sets - Google Patents

Improvements in or relating to noise loading test sets

Info

Publication number
GB1120346A
GB1120346A GB897467A GB897467A GB1120346A GB 1120346 A GB1120346 A GB 1120346A GB 897467 A GB897467 A GB 897467A GB 897467 A GB897467 A GB 897467A GB 1120346 A GB1120346 A GB 1120346A
Authority
GB
United Kingdom
Prior art keywords
noise
line
band
stop filter
receiver
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
GB897467A
Inventor
Bent Bulow Jacobsen
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB897467A priority Critical patent/GB1120346A/en
Priority to DE19681616388 priority patent/DE1616388A1/en
Priority to FR1556550D priority patent/FR1556550A/fr
Priority to BE711158D priority patent/BE711158A/xx
Priority to NL6802582A priority patent/NL6802582A/xx
Publication of GB1120346A publication Critical patent/GB1120346A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

1,120,346. Testing multi-channel telephone lines. STANDARD TELEPHONES & CABLES Ltd. Feb. 24, 1967, No.8974/67. Heading G1U. A noise loading test set for testing multichannel carrier telephone line equipment for non linear distortion performance operates by applying a white noise spectrum to the line, eliminating from this spectrum, using a band stop filter, a narrow band of frequencies to which the line receiver is tuned, and determining the noise introduced by the line into this frequency slot at the receiver. This is done by adjusting an attenuator to give the same receiver output as before the slot was introduced. This known system, however, introduces third order non linear noise and according to the invention this is reduced by introducing into the test set a compensating arrangement for the band stop filter which causes the transmitted power density in the vicinity of the stopped band to be relatively increased, so that the overall transmitted power remains the same. The compensating arrangement consists of a constant impedance filter in cascade with the band stop filter, which comprises either a series connected resonant circuit shunted by a resistance or a shunt connected anti-resonant circuit in series with a resistance.
GB897467A 1967-02-24 1967-02-24 Improvements in or relating to noise loading test sets Expired GB1120346A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB897467A GB1120346A (en) 1967-02-24 1967-02-24 Improvements in or relating to noise loading test sets
DE19681616388 DE1616388A1 (en) 1967-02-24 1968-02-10 Measurement method for performing noise and distortion measurements in multi-channel transmission systems
FR1556550D FR1556550A (en) 1967-02-24 1968-02-21
BE711158D BE711158A (en) 1967-02-24 1968-02-23
NL6802582A NL6802582A (en) 1967-02-24 1968-02-23

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB897467A GB1120346A (en) 1967-02-24 1967-02-24 Improvements in or relating to noise loading test sets

Publications (1)

Publication Number Publication Date
GB1120346A true GB1120346A (en) 1968-07-17

Family

ID=9862901

Family Applications (1)

Application Number Title Priority Date Filing Date
GB897467A Expired GB1120346A (en) 1967-02-24 1967-02-24 Improvements in or relating to noise loading test sets

Country Status (5)

Country Link
BE (1) BE711158A (en)
DE (1) DE1616388A1 (en)
FR (1) FR1556550A (en)
GB (1) GB1120346A (en)
NL (1) NL6802582A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0227389A2 (en) * 1985-12-23 1987-07-01 Ray Milton Dolby Apparatus and method for calibrating recording and transmission systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010044973B4 (en) * 2010-09-10 2016-02-25 Sew-Eurodrive Gmbh & Co Kg Device and method for data transmission and energy transmission via a line

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0227389A2 (en) * 1985-12-23 1987-07-01 Ray Milton Dolby Apparatus and method for calibrating recording and transmission systems
EP0227389A3 (en) * 1985-12-23 1987-11-04 Ray Milton Dolby Apparatus and method for calibrating recording and transmission systems
US4773094A (en) * 1985-12-23 1988-09-20 Dolby Ray Milton Apparatus and method for calibrating recording and transmission systems

Also Published As

Publication number Publication date
BE711158A (en) 1968-08-23
DE1616388A1 (en) 1971-04-15
NL6802582A (en) 1968-08-26
FR1556550A (en) 1969-02-07

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