GB1295625A – – Google Patents
GB1295625A – – Google Patents
Info
Publication number
GB1295625A
GB1295625A
GB1295625DA
GB1295625A
GB 1295625 A
GB1295625 A
GB 1295625A
GB 1295625D A
GB1295625D A
GB 1295625DA
GB 1295625 A
GB1295625 A
GB 1295625A
Authority
GB
United Kingdom
Prior art keywords
comparator
decibels
fine
noise
attenuation
Prior art date
1969-02-04
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
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.)
1969-02-04
Filing date
1970-01-29
Publication date
1972-11-08
1970-01-29
Application filed
filed
Critical
1972-11-08
Publication of GB1295625A
publication
Critical
patent/GB1295625A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
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
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N17/00—Diagnosis, testing or measuring for television systems or their details
Abstract
1295625 Measuring signal/noise ratio R A I RADIOTELEVISIONE ITALIANA 29 Jan 1970 [4 Feb 1969] 4354/70 Heading G4H In apparatus for measuring the signal-to-noise ratio of a television signal, the power of the noise is compared with a reference level in a comparator 10 (Fig. 1) which controls coarse and fine discrete attenuators 2, 6 which are switched in or out until the noise is reduced to a predetermined threshold value the value of the attenuation introduced being displayed. As described during predetermined line scans when the video signal is absent the noise is fed via the attenuators 2, 6, a squarer 7 and ena bled gate 8 to an integrator 9, the output of which is connected to the comparator 10. During each line scan in which the comparator is not triggered, a pulse is fed to a coarse counter connected to a decoder controlling pairs of relays in the attenuator 2 to reduce the attenuation by 10 decibels. When the comparator is operated, a fine decoder is set to zero to give a fine attenuation of 9 decibels and during succeeding line scans its attenuation is reduced by unit decrements under the control of a counter until the comparator triggers again. As described, attenuations of between 19 and 69 decibels are displayed. If the signal to noise ratio is less than 19 decibels the comparator triggers in the first line scan so that the output of the coarse decoder remains on 1 to inhibit the fine counter. If the ratio exceeds 69, the comparator is not triggered during six line scans, the coarse counter when it reaches a count of 7 having the same effect as the comparator when triggered so that the fine decoder is set to zero and an indication of 70 decibels is given.
GB1295625D
1969-02-04
1970-01-29
Expired
GB1295625A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
IT5043969
1969-02-04
Publications (1)
Publication Number
Publication Date
GB1295625A
true
GB1295625A
(en)
1972-11-08
Family
ID=11272971
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1295625D
Expired
GB1295625A
(en)
1969-02-04
1970-01-29
Country Status (5)
Country
Link
US
(1)
US3683282A
(en)
DE
(1)
DE2000353C3
(en)
FR
(1)
FR2031132A5
(en)
GB
(1)
GB1295625A
(en)
NL
(1)
NL7001251A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3106408A1
(en)
*
1980-04-10
1982-01-14
Hajime Industries, Ltd., Tokyo
NOISE DETECTING DEVICE
Families Citing this family (20)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
SU379216A1
(en)
*
1971-09-16
1974-09-05
CA999989A
(en)
*
1972-12-14
1976-11-16
Edgar R. Allen
Measurement of noise in a communication channel
US3831093A
(en)
*
1973-02-28
1974-08-20
Bell Telephone Labor Inc
Signal-to-noise ratio detector for automatic gain controlled receivers
US3875328A
(en)
*
1973-08-03
1975-04-01
Rca Corp
Apparatus and method for measuring the signal to noise ratio for a periodic signal
GB1460513A
(en)
*
1974-05-30
1977-01-06
Poost Office
Measurement of noise in a communication channel
US3970795A
(en)
*
1974-07-16
1976-07-20
The Post Office
Measurement of noise in a communication channel
US4052678A
(en)
*
1975-08-14
1977-10-04
Motorola, Inc.
Noise floor indicative circuit
FR2478320A1
(en)
*
1980-03-17
1981-09-18
Telediffusion Fse
DEVICE FOR ACQUIRING AND EQUIPPING SAMPLES OF A PERIODIC NOISE SIGNAL
NL8300725A
(en)
*
1983-02-25
1984-09-17
Optische Ind De Oude Delft Nv
METHOD AND APPARATUS FOR DETERMINING THE IMAGE TRANSMISSION QUALITY OF AN IMAGE SYSTEM.
US4721997A
(en)
*
1986-06-02
1988-01-26
Sencore, Inc.
Signal to noise ratio measurement by sampling noise outside carrier frequency
GB2192465B
(en)
*
1986-07-12
1990-03-21
Marconi Instruments Ltd
Signal measurement
FR2605822B1
(en)
*
1986-10-22
1989-06-16
Beugin Marc
METHOD FOR SELECTING TELEVISION SIGNALS, PARTICULARLY IN A REDUNDANT TWO-CHANNEL LINK, AND DEVICE FOR CARRYING OUT SAID METHOD
US4837498A
(en)
*
1987-09-29
1989-06-06
Hewlett-Packard Company
Method and apparatus for setting the signal-to-noise ratio of a carrier wave
US5128619A
(en)
*
1989-04-03
1992-07-07
Bjork Roger A
System and method of determining cable characteristics
ES2108620B1
(en)
*
1994-12-19
1998-08-01
Instrumentacion Electronica Pr
PROCEDURE AND APPARATUS FOR MEASURING THE CARRIER-NOISE RATIO IN A TELEVISION CHANNEL.
US6041777A
(en)
*
1995-12-01
2000-03-28
Alliance Pharmaceutical Corp.
Methods and apparatus for closed-circuit ventilation therapy
US6239834B1
(en)
*
1996-01-11
2001-05-29
Kokusai Denshin Denwa Co., Ltd.
Apparatus for evaluating digital picture quality
GB9713790D0
(en)
*
1997-07-01
1997-09-03
Raychem Sa Nv
Noise monitoring unit
CA2374437C
(en)
1999-10-28
2007-02-13
Tollgrade Communications, Inc.
Method and apparatus for delay-line time-domain reflectometry
US8593526B1
(en)
*
2012-06-22
2013-11-26
Silicon Laboratories Inc.
Apparatus for measuring noise in an analog signal
Family Cites Families (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2694142A
(en)
*
1949-11-10
1954-11-09
Bell Telephone Labor Inc
Signal-to-noise energy detection unit
US2868970A
(en)
*
1953-10-27
1959-01-13
Hazeltine Research Inc
Signal-to-noise responsive system
BE548184A
(en)
*
1955-06-01
US2988693A
(en)
*
1957-12-31
1961-06-13
Gen Electronic Lab Inc
Signal and noise level determining apparatus
US2959672A
(en)
*
1960-02-24
1960-11-08
Haise Anthony R La
Signal-plus-noise to noise ratio meter
US3302116A
(en)
*
1963-05-16
1967-01-31
Sperry Rand Corp
Signal plus noise to noise measuring equipment
GB1212367A
(en)
*
1966-12-23
1970-11-18
Wandel U Goltermann K G
A high frequency signal level measuring instrument
1970
1970-01-07
DE
DE2000353A
patent/DE2000353C3/en
not_active
Expired
1970-01-15
FR
FR7001374A
patent/FR2031132A5/fr
not_active
Expired
1970-01-28
US
US6488A
patent/US3683282A/en
not_active
Expired – Lifetime
1970-01-29
NL
NL7001251A
patent/NL7001251A/xx
unknown
1970-01-29
GB
GB1295625D
patent/GB1295625A/en
not_active
Expired
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3106408A1
(en)
*
1980-04-10
1982-01-14
Hajime Industries, Ltd., Tokyo
NOISE DETECTING DEVICE
Also Published As
Publication number
Publication date
FR2031132A5
(en)
1970-11-13
US3683282A
(en)
1972-08-08
DE2000353B2
(en)
1979-04-05
DE2000353C3
(en)
1979-11-29
NL7001251A
(en)
1970-08-06
DE2000353A1
(en)
1970-08-06
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Legal Events
Date
Code
Title
Description
1973-03-21
PS
Patent sealed [section 19, patents act 1949]
1981-02-25
746
Register noted ‘licences of right’ (sect. 46/1977)
1985-09-25
PCNP
Patent ceased through non-payment of renewal fee
