GB1295850A - - Google Patents

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Publication number
GB1295850A
GB1295850A GB1295850DA GB1295850A GB 1295850 A GB1295850 A GB 1295850A GB 1295850D A GB1295850D A GB 1295850DA GB 1295850 A GB1295850 A GB 1295850A
Authority
GB
United Kingdom
Prior art keywords
band
frequencies
bands
parallel
iii
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
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 filed Critical
Publication of GB1295850A publication Critical patent/GB1295850A/en
Expired legal-status Critical Current

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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
    • H03J5/24—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 a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—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 a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244—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 a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means

Landscapes

  • Filters And Equalizers (AREA)

Abstract

1295850 TV receivers PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd (Philips Gloeilampenfabrieken NV) 24 Dec 1969 62800/69 Heading H3Q A circuit for the reception of electrical signals from a plurality of spaced frequency ranges (Fig. 2, not shown), e.g. bands I, III and IV/V of TV transmission, comprises a network 1<SP>1</SP>-8<SP>1</SP> comprising a plurality of parallel resonant circuits having a common tuning element 1<SP>1</SP>, wherein for any given value of the element 1<SP>1</SP> only one of said parallel resonant circuits will resonate within any one of the ranges, signals lying outside the range being suppressed by filters 13-15. The values of the components 2<SP>1</SP>, 6<SP>1</SP>, 8<SP>1</SP> are so that for band I frequencies capacitances 5<SP>1</SP>, 7<SP>1</SP> are effectively in parallel across 1<SP>1</SP>, 2<SP>1</SP>, for band III frequencies, elements 1<SP>1</SP>, 2<SP>1</SP>, 7<SP>1</SP> are in parallel across the series combination of 6<SP>1</SP>, 5<SP>1</SP> and for band IV/V frequencies the other elements constitute a capacitive reactance across the series combination of 7<SP>1</SP>, 8<SP>1</SP>. As the tuning voltage u applied to 1<SP>1</SP> is increased from a small to a large value, the different bands are passed through separately since for a tuning voltage corresponding to the lowest frequency of a band, the frequency of the resonant circuit operating in the band below it is at or above the highest frequency of that band. Fig. 3 indicates a self-oscillating mixer stage with input signals applied via 10, 11 and feed-back for the appropriate band of frequencies being provided by selective filters 13-15. Fig. 4 (not shown) indicates a band-pass filter stage having two similar networks (1-8) coupled inductively via inductances (2) or capacitively via an additional capacitance (24) for bands I/III and inductively coupled via coaxial line resonant sections (8) for bands IV/V. For proper impedance matching to a transistor stage, the capacitor 5<SP>1</SP> may be replaced by a further varactor (Fig. 5, not shown) tuned by the same voltage applied to 1<SP>1</SP>.
GB1295850D 1969-12-24 1969-12-24 Expired GB1295850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6280069 1969-12-24

Publications (1)

Publication Number Publication Date
GB1295850A true GB1295850A (en) 1972-11-08

Family

ID=10488508

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1295850D Expired GB1295850A (en) 1969-12-24 1969-12-24

Country Status (1)

Country Link
GB (1) GB1295850A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4839617A (en) * 1987-11-27 1989-06-13 U.S. Philips Corporation Bandpass filter circuit arrangement
US5028894A (en) * 1987-11-27 1991-07-02 U.S. Philips Corp. Bandpass filter circuit arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4839617A (en) * 1987-11-27 1989-06-13 U.S. Philips Corporation Bandpass filter circuit arrangement
US5028894A (en) * 1987-11-27 1991-07-02 U.S. Philips Corp. Bandpass filter circuit arrangement

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Legal Events

Date Code Title Description
PS Patent sealed