ES2017569A6 - Audio filter using multiple input SAW device - Google Patents

Audio filter using multiple input SAW device

Info

Publication number
ES2017569A6
ES2017569A6 ES898903952A ES8903952A ES2017569A6 ES 2017569 A6 ES2017569 A6 ES 2017569A6 ES 898903952 A ES898903952 A ES 898903952A ES 8903952 A ES8903952 A ES 8903952A ES 2017569 A6 ES2017569 A6 ES 2017569A6
Authority
ES
Spain
Prior art keywords
audio
filters
saw
filter
tuner
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 - Lifetime
Application number
ES898903952A
Other languages
Spanish (es)
Inventor
Young Jun Lee
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.)
LG Electronics Inc
Original Assignee
Gold Star Co Ltd
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 Gold Star Co Ltd filed Critical Gold Star Co Ltd
Publication of ES2017569A6 publication Critical patent/ES2017569A6/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H03J5/24—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)
  • Networks Using Active Elements (AREA)

Abstract

The audio IF filter circuit described is suitable for use in a television receiver for decoding audio signals transmitted in any of a number of frequency standards. The circuit includes a tuner (1), first and second audio saw filters (2,3), a third audio saw filter (4), a video saw filter (5), and an audio IF demodulator (6). The tuner (1) supplies signals in parallel to the saw filters (2 to 5) and one of the audio filters is activated by control signals (Va to Vc) so as to give a desired filtering frequency depending on the frequency standard in use. The output signal of the activated one of the saw filters is supplied to the demodulator (6). The third audio saw filter is specially adapted so as to have first and second inputs (4a, 4b) which are connected to the tuner (1) by selection circuitry (Q1, D1, D2, L2, R1 to R3) for selecting one or other of the inputs (4a or 4b) in response to one of the control signals (Va). This allows the third audio saw filter to perform the function of two conventional such filters, thereby reducing the manufacturing cost of the filter circuit.
ES898903952A 1988-11-22 1989-11-20 Audio filter using multiple input SAW device Expired - Lifetime ES2017569A6 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR880018917 1988-11-22

Publications (1)

Publication Number Publication Date
ES2017569A6 true ES2017569A6 (en) 1991-02-16

Family

ID=19281519

Family Applications (1)

Application Number Title Priority Date Filing Date
ES898903952A Expired - Lifetime ES2017569A6 (en) 1988-11-22 1989-11-20 Audio filter using multiple input SAW device

Country Status (6)

Country Link
DE (1) DE3938303A1 (en)
ES (1) ES2017569A6 (en)
GB (1) GB2225681B (en)
HU (1) HU206173B (en)
IT (2) IT8934897V0 (en)
RU (1) RU1833515C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4317220A1 (en) * 1993-05-24 1994-12-01 Thomson Brandt Gmbh Circuit for sound standard detection in a television receiver

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858118A (en) * 1973-07-17 1974-12-31 Westinghouse Electric Corp Acoustic surface wave television tuner
FI63508C (en) * 1981-02-11 1983-06-10 Salora Oy KOPPLING VID EN TELEVISIONSMOTTAGARE FOER DETEKTERING AV LJUDSIGNALER SOM SAENTS ENLIGT OLIKA SAENDNINGSNORMER
US4511924A (en) * 1982-10-29 1985-04-16 Rca Corporation Frequency translation phase-locked loop for separate or intercarrier type television sound detection
DE3509516C1 (en) * 1985-03-16 1986-09-18 Philips Patentverwaltung Gmbh, 2000 Hamburg Circuit arrangement of the input stages of a television tuner

Also Published As

Publication number Publication date
GB2225681B (en) 1993-04-14
DE3938303C2 (en) 1992-12-24
GB2225681A (en) 1990-06-06
IT8934897V0 (en) 1989-11-21
IT1237577B (en) 1993-06-08
GB8926168D0 (en) 1990-01-10
HUT55179A (en) 1991-04-29
DE3938303A1 (en) 1990-05-23
IT8946886A1 (en) 1991-05-21
IT8946886A0 (en) 1989-11-21
HU895954D0 (en) 1990-02-28
RU1833515C (en) 1993-08-07
HU206173B (en) 1992-08-28

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Legal Events

Date Code Title Description
SA6 Expiration date (snapshot 920101)

Free format text: 2009-11-20

FD1A Patent lapsed

Effective date: 20071121