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GB1164386A - Frequency Separation. - Google Patents

Frequency Separation.

Info

Publication number
GB1164386A
GB1164386AGB2457667AGB2457667AGB1164386AGB 1164386 AGB1164386 AGB 1164386AGB 2457667 AGB2457667 AGB 2457667AGB 2457667 AGB2457667 AGB 2457667AGB 1164386 AGB1164386 AGB 1164386A
Authority
GB
United Kingdom
Prior art keywords
frequency
group
frequencies
zero
separated
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
GB2457667A
Inventor
Robert Walter Alister Scarr
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 PLCfiledCriticalStandard Telephone and Cables PLC
Priority to GB2457667ApriorityCriticalpatent/GB1164386A/en
Publication of GB1164386ApublicationCriticalpatent/GB1164386A/en
Expiredlegal-statusCriticalCurrent

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Abstract

1,164,386. Automatic exchange systems; voice frequency signalling. STANDARD TELEPHONES & CABLES Ltd. 26 May, 1967, No. 24576/67. Headings H4K and H4R. To detect a frequency combination comprising one frequency from a higher frequency group and one from a lower frequency group each frequency is emphasized with respect to the other to obtain the frequencies in separate channels, the presence of such a frequency in each channel being determined by counting the number of zero-crossings or by measuring the distances between zero-crossing points. The arrangement is suited to production as a solid state circuit. The frequencies of one group are separated from the frequencies of the other group by attenuation of each group relative to the other. The separated signals may be amplitude limited before the zero-crossing patterns are investigated.
GB2457667A1967-05-261967-05-26Frequency Separation.ExpiredGB1164386A (en)

Priority Applications (1)

Application NumberPriority DateFiling DateTitle
GB2457667AGB1164386A (en)1967-05-261967-05-26Frequency Separation.

Applications Claiming Priority (1)

Application NumberPriority DateFiling DateTitle
GB2457667AGB1164386A (en)1967-05-261967-05-26Frequency Separation.

Publications (1)

Publication NumberPublication Date
GB1164386Atrue GB1164386A (en)1969-09-17

Family

ID=10213828

Family Applications (1)

Application NumberTitlePriority DateFiling Date
GB2457667AExpiredGB1164386A (en)1967-05-261967-05-26Frequency Separation.

Country Status (1)

CountryLink
GB (1)GB1164386A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
US4061885A (en)*1975-12-171977-12-06Motorola, Inc.Digital tone decoder
FR2478901A1 (en)*1980-03-181981-09-25Jeumont Schneider HIGHER AMPLITUDE ALTERNATING SIGNAL SELECTION STAGE AMONG TWO DIFFERENT FREQUENCY SIGNALS

Cited By (5)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
US4061885A (en)*1975-12-171977-12-06Motorola, Inc.Digital tone decoder
FR2478901A1 (en)*1980-03-181981-09-25Jeumont Schneider HIGHER AMPLITUDE ALTERNATING SIGNAL SELECTION STAGE AMONG TWO DIFFERENT FREQUENCY SIGNALS
WO1981002714A1 (en)*1980-03-181981-10-01Jeumont SchneiderSelection stage of the ac signal having the greater amplitude
DE3140626C1 (en)*1980-03-181984-03-08Jeumont-Schneider, 92811 Puteaux Circuit arrangement for the selection of an electrical alternating signal
US4488238A (en)*1980-03-181984-12-11Jeumont-Schneider CorporationSelection stage of the AC signal of greater amplitude between two signals of different frequencies

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Legal Events

DateCodeTitleDescription
PSPatent sealed
435Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNPPatent ceased through non-payment of renewal fee
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