GB1299627A - Improvements in or relating to noise measurement systems - Google Patents

Improvements in or relating to noise measurement systems

Info

Publication number
GB1299627A
GB1299627A GB4600770D GB4600770D GB1299627A GB 1299627 A GB1299627 A GB 1299627A GB 4600770 D GB4600770 D GB 4600770D GB 4600770 D GB4600770 D GB 4600770D GB 1299627 A GB1299627 A GB 1299627A
Authority
GB
United Kingdom
Prior art keywords
channel
band
noise
stages
measured
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
GB4600770D
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB1299627A publication Critical patent/GB1299627A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/16—Monitoring arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/14—Monitoring arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

1299627 Measuring noise SIEMENS A G 28 Sept 1970 [29 Sept 1969] 46007/70 Heading G1U Noise in a communication channel 4, Fig. 1 e.g. a frequency or time division multiplex channel, is measured by injecting a noise signal of known amplitude and lying in the band 350 to 550 c/s into the channel, this signal being derived from a signal generator 1 by filtering 2, amplifying 3 and measuring 10, and the output signal produced by the channel 4 is processed in two ways, firstly the energy lying in the band 700 to 3, 000 c/s is measured, with switches 52, 52<SP>1</SP> in their positions shown, and secondly, with switches 52, 52<SP>1</SP> in their upper positions, the energy lying in the band 0 to 3, 000 c/s is measured and an attennator 9 is adjusted until the meter reading is the same as that for the band 700 to 3, 000 c/s. The setting of the attennator 9 is then a measure of the noise produced by the channel. The signal generator 1 comprises a shift register 11, 12, .... 20, Fig. 2, having feedback to the first stage from stages 13 and 20 via an exclusive or circuit 25, stepped by clock pulses 21. Such an arrangement produces, in known manner, a pseudorandom train of pulses, which, by a suitable choice of clock frequency and number of stages in the register, (e.g. 10 kc/s and ten stages) can be made rich in low frequency components.
GB4600770D 1969-09-29 1970-09-28 Improvements in or relating to noise measurement systems Expired GB1299627A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691949132 DE1949132B2 (en) 1969-09-29 1969-09-29 NOISE CLINK MEASURING METHOD FOR CHECKING A MESSAGE TRANSMISSION SYSTEM OR PART OF THE MESSAGE

Publications (1)

Publication Number Publication Date
GB1299627A true GB1299627A (en) 1972-12-13

Family

ID=5746812

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4600770D Expired GB1299627A (en) 1969-09-29 1970-09-28 Improvements in or relating to noise measurement systems

Country Status (2)

Country Link
DE (1) DE1949132B2 (en)
GB (1) GB1299627A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2031197B (en) * 1978-10-06 1982-12-15 Marconi Instruments Ltd Pseudo-random noise generator
DE2949600A1 (en) * 1979-12-10 1981-06-11 Siemens AG, 1000 Berlin und 8000 München METHOD AND CIRCUIT FOR DETERMINING THE QUANTIZATION DISTORTIONS OF TRANSMISSION DEVICES

Also Published As

Publication number Publication date
DE1949132B2 (en) 1977-02-03
DE1949132A1 (en) 1971-04-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee