GB1417588A - Radio-frequency receivers - Google Patents

Radio-frequency receivers

Info

Publication number
GB1417588A
GB1417588A GB5768772A GB5768772A GB1417588A GB 1417588 A GB1417588 A GB 1417588A GB 5768772 A GB5768772 A GB 5768772A GB 5768772 A GB5768772 A GB 5768772A GB 1417588 A GB1417588 A GB 1417588A
Authority
GB
United Kingdom
Prior art keywords
channel
tuning
oscillator
receiver
signal
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
GB5768772A
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 GB1417588A publication Critical patent/GB1417588A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
    • H03J7/28—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using counters or frequency dividers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/20—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

1417588 Channel selector circuits INTERNATIONAL STANDARD ELECTRIC CORP 14 Dec 1972 [22 Dec 1971] 57687/72 Heading H3Q In a receiver having a channel selector 6 and a tuning oscillator 3 variable by a tuning signal Ut, a mixer 13 receives the oscillator signal fo and integral multiples f<SP>1</SP>n of the channel separation frequency generated by an auxiliary oscillator 11 tuned to the channel separation frequency and a harmonic generator 12 and a filter 14, and a frequency discriminator 8 provide a signal to modify the tuning signal. On selection of a channel by the selector 6 a control means including a filter 15 and counting and comparison means 7 causes sweeping of the tuning signal Ut and in response to a digital control signal, derived through a filter 15 and counting and comparison means 7 from the output of the mixer 3, indicative that the receiver tuning is closed to the selected channel then halts the sweep of the tuning and establishes an automatic frequency control loop in which the tuning signal is modified to maintain the receiver tuned to the selected channel until another channel is selected. In the TV receiver shown a channel is selected by a preselector switch 6 such as push-button keys and on pressing a start button 9 associated with logic circuits 7 operate to start a saw-tooth generator 10 which produces the varying tuning signal Ut for the electronically tuned oscillator 3. A crystal oscillator 11 feeds a spectrum generator 12 which produces a harmonic spectrum output f<SP>1</SP>n of the channel separation frequency fd which is fed to the mixer 13. When a predetermined I.F. is obtained at the output of a mixer 13 it is fed to a LPF 15 the output of which is rectified and converted into pulses 16 by a Schmitt trigger circuit. The pulses 16 are fed to a counter 17 and when the count corresponding to the channel selected by 6 is reached the logic circuits 7 operate to stop the sweep of the sawtooth generator 10 and to connect the output of the discriminator 8 via a controlled switch 18 and an adder 19 to modify the tuning voltage Ut applied to the oscillator 3. The AFC loop 8, 18, 19, 3, 13, 14 now maintains the receiver tuned to the selected channel until another channel is selected by operating the button associated with 9. To change the channel separation frequency the auxiliary I.F. fz2 is changed by retuning the discriminator and filters such as by switching and varactor diodes actuated from the logic 7. The channel selected may be digitally indicated at 20 by digital indicating tubes or light emitting diodes. The receiver also includes an R.F. stage 1, a mixer 2 and an I.F. amplifier and demodulator 4.
GB5768772A 1971-12-22 1972-12-14 Radio-frequency receivers Expired GB1417588A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712164015 DE2164015A1 (en) 1971-12-22 1971-12-22 PROCEDURE AND ARRANGEMENT FOR TUNING HF RECEIVERS, IN PARTICULAR TELEVISION RECEIVERS

Publications (1)

Publication Number Publication Date
GB1417588A true GB1417588A (en) 1975-12-10

Family

ID=5828922

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5768772A Expired GB1417588A (en) 1971-12-22 1972-12-14 Radio-frequency receivers

Country Status (4)

Country Link
AU (1) AU466556B2 (en)
DE (1) DE2164015A1 (en)
FR (1) FR2170552A5 (en)
GB (1) GB1417588A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5330864A (en) * 1991-09-18 1994-07-19 Minnesota Mining And Manufacturing Company Cyan chromogenic leuco dyes for photothermographic materials

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4616191A (en) * 1983-07-05 1986-10-07 Raytheon Company Multifrequency microwave source

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5330864A (en) * 1991-09-18 1994-07-19 Minnesota Mining And Manufacturing Company Cyan chromogenic leuco dyes for photothermographic materials

Also Published As

Publication number Publication date
DE2164015A1 (en) 1973-07-19
FR2170552A5 (en) 1973-09-14
AU466556B2 (en) 1975-10-30
AU4988672A (en) 1974-06-13

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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)
PCNP Patent ceased through non-payment of renewal fee