GB1291516A - Frequency-selective signal receiver - Google Patents

Frequency-selective signal receiver

Info

Publication number
GB1291516A
GB1291516A GB43288/70A GB4328870A GB1291516A GB 1291516 A GB1291516 A GB 1291516A GB 43288/70 A GB43288/70 A GB 43288/70A GB 4328870 A GB4328870 A GB 4328870A GB 1291516 A GB1291516 A GB 1291516A
Authority
GB
United Kingdom
Prior art keywords
given frequency
frequency
signal
input
fed
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
GB43288/70A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1291516A publication Critical patent/GB1291516A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

1291516 Radio receivers; semi-conductor circuits; line transmission systems INTERNATIONAL STANDARD ELECTRIC CORP 10 Sept 1970 [18 Sept 1969] 43288/70 Headings H3Q H3T and H4R [Also in Division G4] In a device for detecting the presence of a given frequency in a signal, the signal is fed to a ring modulator. MO. A multivibrator Gf1 tuned to the given frequency is coupled to the input so that if the given frequency is present in the input the multivibrator locks on to the frequency and phase of the input aided by coupling capacitor CK, and if the given frequency is present in the input the multivibrator biases the ring modulator so that it full wave rectifies the signal. The output of the ring modulator feeds a summing circuit SU which in turn feeds a threshold device SD. If the given frequency is present an output is obtained at AS. An initial limiting amplifier may be used and the summing circuit and threshold device may be replaced by a delay line. If more than one frequency is to be detected, a series of multivibrators Gf 1 -Gfn may be connected in turn to the modulator MO by means of switch AT1, Fig. 3a. The outputs of the modulator for the different multivibrators are fed to summing circuits SU1-SUn by switch AT2. The outputs of the summing circuits are fed in turn via switch AT3 to threshold device FD, the output of which is fed via AND gates U1-Un, to output terminals AS1-ASn. Summing circuit SUb monitors the whole signal bandwidth and prevents errors arising at the commencement of the signal during short -measuring times.
GB43288/70A 1969-09-18 1970-09-10 Frequency-selective signal receiver Expired GB1291516A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691947316 DE1947316A1 (en) 1969-09-18 1969-09-18 Frequency selective signal receiver

Publications (1)

Publication Number Publication Date
GB1291516A true GB1291516A (en) 1972-10-04

Family

ID=5745869

Family Applications (1)

Application Number Title Priority Date Filing Date
GB43288/70A Expired GB1291516A (en) 1969-09-18 1970-09-10 Frequency-selective signal receiver

Country Status (6)

Country Link
BE (1) BE756310A (en)
CH (1) CH530140A (en)
DE (1) DE1947316A1 (en)
FR (1) FR2061795B1 (en)
GB (1) GB1291516A (en)
ZA (1) ZA706171B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134757A (en) * 1983-01-31 1984-08-15 Sony Corp Pilot signal identifying apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1267272B (en) * 1966-03-25 1968-05-02 Siemens Ag Frequency selective signal receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134757A (en) * 1983-01-31 1984-08-15 Sony Corp Pilot signal identifying apparatus

Also Published As

Publication number Publication date
FR2061795B1 (en) 1975-02-21
CH530140A (en) 1972-10-31
FR2061795A1 (en) 1971-06-25
BE756310A (en) 1971-03-18
ZA706171B (en) 1971-05-27
DE1947316A1 (en) 1971-04-01

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PLNP Patent lapsed through nonpayment of renewal fees