[go: up one dir, main page]

GB2267621B - Audio frequency filter - Google Patents

Audio frequency filter

Info

Publication number
GB2267621B
GB2267621B GB9213620A GB9213620A GB2267621B GB 2267621 B GB2267621 B GB 2267621B GB 9213620 A GB9213620 A GB 9213620A GB 9213620 A GB9213620 A GB 9213620A GB 2267621 B GB2267621 B GB 2267621B
Authority
GB
United Kingdom
Prior art keywords
audio frequency
frequency filter
filter
audio
frequency
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 - Fee Related
Application number
GB9213620A
Other versions
GB9213620D0 (en
GB2267621A (en
Inventor
Peter Jostins
John Robert Stadius
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.)
Soundtracs PLC
Original Assignee
Soundtracs PLC
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
Priority claimed from GB929211651A external-priority patent/GB9211651D0/en
Application filed by Soundtracs PLC filed Critical Soundtracs PLC
Priority to GB9213620A priority Critical patent/GB2267621B/en
Publication of GB9213620D0 publication Critical patent/GB9213620D0/en
Priority claimed from US08/092,597 external-priority patent/US5459791A/en
Publication of GB2267621A publication Critical patent/GB2267621A/en
Application granted granted Critical
Publication of GB2267621B publication Critical patent/GB2267621B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier
GB9213620A 1992-06-02 1992-06-26 Audio frequency filter Expired - Fee Related GB2267621B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9213620A GB2267621B (en) 1992-06-02 1992-06-26 Audio frequency filter

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB929211651A GB9211651D0 (en) 1992-06-02 1992-06-02 Audio frequency filter
GB9213620A GB2267621B (en) 1992-06-02 1992-06-26 Audio frequency filter
US08/092,597 US5459791A (en) 1992-06-02 1993-07-16 Audio frequency filter
JP5187830A JPH0766681A (en) 1992-06-02 1993-07-29 Audio filter

Publications (3)

Publication Number Publication Date
GB9213620D0 GB9213620D0 (en) 1992-08-12
GB2267621A GB2267621A (en) 1993-12-08
GB2267621B true GB2267621B (en) 1996-01-03

Family

ID=27450884

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9213620A Expired - Fee Related GB2267621B (en) 1992-06-02 1992-06-26 Audio frequency filter

Country Status (1)

Country Link
GB (1) GB2267621B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1517056A (en) * 1975-01-30 1978-07-05 Sony Corp Acoustic surface-wave filter circuits
US4168472A (en) * 1977-02-10 1979-09-18 Tokyo Shibaura Electric Co., Ltd. Variable gain controller
WO1987006074A1 (en) * 1986-04-02 1987-10-08 Plessey Overseas Limited A programmable electronic filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1517056A (en) * 1975-01-30 1978-07-05 Sony Corp Acoustic surface-wave filter circuits
US4168472A (en) * 1977-02-10 1979-09-18 Tokyo Shibaura Electric Co., Ltd. Variable gain controller
WO1987006074A1 (en) * 1986-04-02 1987-10-08 Plessey Overseas Limited A programmable electronic filter
GB2189100A (en) * 1986-04-02 1987-10-14 Plessey Co Plc A programmable electronic filter

Also Published As

Publication number Publication date
GB9213620D0 (en) 1992-08-12
GB2267621A (en) 1993-12-08

Similar Documents

Publication Publication Date Title
GB2269715B (en) Improved radio frequency filter
GB2266671B (en) Filter apparatus
GB2269706B (en) Dielectric filter construction
EP0509495A3 (en) Intermediate frequency filter
GB9210681D0 (en) Filter cigarette manufacture
KR0139281B1 (en) High frequency continuous time filter
IL112465A0 (en) Microwave band pass filter
AU4175393A (en) Filter
GB2263384B (en) Cigarette filter manufacture
GB9200904D0 (en) Cigarette filter manufacture
GB2272843B (en) Filter elements
AU3397393A (en) Filter
GB9217470D0 (en) Microwave filter
ZA935518B (en) Improved filter
GB2267621B (en) Audio frequency filter
GB9211651D0 (en) Audio frequency filter
GB2276835B (en) Filter
GB9314678D0 (en) Audio frequency testing system
GB9226775D0 (en) Cigarette filter
GB9111663D0 (en) Frequency filters
KR0109189Y1 (en) High frequency noise filter
PL296807A1 (en) Audio set
ZA934831B (en) Filter
GB9221061D0 (en) Filter
GB9216028D0 (en) Filter

Legal Events

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

Effective date: 20000626