GB1351286A - Electromechanical if filter for television receivers - Google Patents

Electromechanical if filter for television receivers

Info

Publication number
GB1351286A
GB1351286A GB1548271*[A GB1351286DA GB1351286A GB 1351286 A GB1351286 A GB 1351286A GB 1351286D A GB1351286D A GB 1351286DA GB 1351286 A GB1351286 A GB 1351286A
Authority
GB
United Kingdom
Prior art keywords
transducers
filter
luminance
surface wave
chrominance
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
GB1548271*[A
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Publication of GB1351286A publication Critical patent/GB1351286A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04N5/4446—IF amplifier circuits specially adapted for B&W TV
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14544—Transducers of particular shape or position
    • H03H9/1455—Transducers of particular shape or position constituted of N parallel or series transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
    • H03H9/72—Networks using surface acoustic waves
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
    • H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

1351286 Surface wave filters MULLARD Ltd 18 May 1971 15482/71 Heading H3U In an I.F. acoustic surface wave filter for a colour T.V. receiver, comprising launching transducers 2, or 12, luminance receiving transducers 4, or 14, and chrominance receiving transducers 3, or 13 mounted on a piezoelectric wafer 1, or 11, the required luminance delay is provided by having the effective spacing of transducers 2, 4; 12, 14 greater than that for transducers 2, 3; 12, 13. The transducers are dimensioned so that the bandpass for the luminance signal is greater than that for the chrominance signal. The transducers 13, 14 may be spaced from each other. The filter may be associated with integrated circuit detectors and amplifiers. The layers 7, 8; 17, 18 are wax damping material. The transducers are formed of gold by a photo-lithographic process. The wafer may be lithium niobate, ammonium dihydrogen phosphate, cadmium sulphide, or a poled ferro-electric ceramic such as sodium potassium niobate, barium titanate or lead zirconium titanate.
GB1548271*[A 1971-05-18 1971-05-18 Electromechanical if filter for television receivers Expired GB1351286A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1548271 1971-05-18

Publications (1)

Publication Number Publication Date
GB1351286A true GB1351286A (en) 1974-04-24

Family

ID=10059918

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1548271*[A Expired GB1351286A (en) 1971-05-18 1971-05-18 Electromechanical if filter for television receivers

Country Status (9)

Country Link
JP (1) JPS5341937B1 (en)
AU (1) AU468110B2 (en)
BE (1) BE783542A (en)
DE (1) DE2220924C3 (en)
ES (1) ES402770A1 (en)
FR (1) FR2138105B1 (en)
GB (1) GB1351286A (en)
IT (1) IT958874B (en)
NL (1) NL7206490A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604595A (en) * 1982-06-16 1986-08-05 Murata Manufacturing Co., Ltd. Surface acoustic wave device having interdigitated comb electrodes weighted for odd/even response
US4910483A (en) * 1984-04-09 1990-03-20 U.S. Philips Corporation Acoustic surface wave filter device with asymmetric transducers and method of manufacturing same

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1554366A (en) * 1977-02-04 1979-10-17 Philips Electronic Associated Acoustic surface wave devices
FR2428350A1 (en) * 1978-06-06 1980-01-04 Thomson Csf SURFACE ELASTIC WAVE FILTER AND INTERMEDIATE FREQUENCY STAGE OF A TELEVISION RECEIVER COMPRISING SUCH A FILTER
JPS55134587A (en) * 1979-04-05 1980-10-20 Sanyo Electric Co Ltd Color television receiver
JPS57172422U (en) * 1981-04-25 1982-10-30
JPS5857813A (en) * 1981-10-02 1983-04-06 Hitachi Ltd Surface acoustic wave device with variable amplitude frequency characteristic

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604595A (en) * 1982-06-16 1986-08-05 Murata Manufacturing Co., Ltd. Surface acoustic wave device having interdigitated comb electrodes weighted for odd/even response
US4910483A (en) * 1984-04-09 1990-03-20 U.S. Philips Corporation Acoustic surface wave filter device with asymmetric transducers and method of manufacturing same

Also Published As

Publication number Publication date
AU468110B2 (en) 1976-01-08
DE2220924A1 (en) 1972-12-07
BE783542A (en) 1972-11-16
DE2220924C3 (en) 1979-09-20
AU4220572A (en) 1973-11-15
IT958874B (en) 1973-10-30
ES402770A1 (en) 1975-10-16
DE2220924B2 (en) 1979-02-01
JPS5341937B1 (en) 1978-11-08
FR2138105B1 (en) 1973-07-13
NL7206490A (en) 1972-11-21
FR2138105A1 (en) 1972-12-29

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee