US3769606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digitally controlled frequency filter
Assignee: LINK TACTICAL MILITARY SIMULATION Corp EXISTING UNDER LAWS OF DELAWARE
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Filing: 1971-05-26
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Granted: 1973-10-30
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Expires: 1991-05-26
Abstract
Abstract A digitally controlled filter comprises an operational amplifier having selectable output circuits with predetermined time constants. A plug-in unit determines whether the filter will be a high-pass filter, a low-pass filter, or a band-pass filter. The time constants in the circuit are determined by the application of a digital word to a plurality of switching gates to connect into the circuit one or more impedance combinations having predetermined time constants.
Inventors
- 👤 H Henegar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:55
CPC Classifications
H; H01; H01R; H01R29/00; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/126
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
267 words
A selective digitally controlled frequency filter comprising: a. a base; b. a plurality of first type of impedances mounted on said base; c. a plurality of second type of impedances mounted on said base, each combination of a first type of impedances and a second type of impedances forming a filter component; d. a plurality of supports each of which carries a different arrangement of electrical conductors, said supports individually mating with said base; e. first means carried on said base and second means carried on said individual supports for electrically connecting at least one side of said first type of impedances and of said second type of impedances to said electrical conductors so that when a support is mated with said base said first impedances are connected on one side to selected ones of said second impedance in a prescribed pattern to form a prescribed type of filter; f. a plurality of electrical switches which respond to an electrical digital representation of a quantity to open and close; g. means for connecting one side of said individual electrical switches to the other sides of said individual first impedances and the other sides of said switches together and to a common reference potential; and h. means for connecting the other sides of said second impedances to said common reference potential; i. whereby a particular support mated with said base connects together said first and second impedances to form a prescribed type of filter and an electrical digital representation of a quantity applied to said switches connect together individual first impedances to select the range of said filter.
Claim 2
Dependent Claim
267 words
A selective digitally controlled frequency filter comprising: a. a base; b. a plurality of first type of impedances mounted on said base; c. a plurality of second type of impedances mounted on said base, each combination of a first type of impedances and a second type of impedances forming a filter component; d. a plurality of supports each of which carries a different arrangement of electrical conductors, said supports individually mating with said base; e. first means carried on said base and second means carried on said individual supports for electrically connecting at least one side of said first type of impedances and of said second type of impedances to said electrical conductors so that when a support is mated with said base said first impedances are connected on one side to selected ones of said second impedance in a prescribed pattern to form a prescribed type of filter; f. a plurality of electrical switches which respond to an electrical digital representation of a quantity to open and close; g. means for connecting one side of said individual electrical switches to the other sides of said individual first impedances and the other sides of said switches together and to a common reference potential; and h. means for connecting the other sides of said second impedances to said common reference potential; i. whereby a particular support mated with said base connects together said first and second impedances to form a prescribed type of filter and an electrical digital representation of a quantity applied to said switches connect together individual first impedances to select the range of said filter.
Claim 3
Dependent Claim
21 words
The filter defined in claim 1 wherein said base comprises an electrical socket and wherein said supports comprise electrical plugin units.
Claim 4
Dependent Claim
33 words
The filter defined in claim 1 further including means for receiving digital information and for storing said digital information, and means for connecting the output of said storing means to said switch means.
Claim 5
Dependent Claim
26 words
The filter defined in claim 3 further including means interposed between said storing means and said switch means for controlling the transfer of digital data therebetween.
Claim 6
Dependent Claim
18 words
The filter defined in claim 4 wherein said second elements comprise capacitors and said first elements comprise resistors.
Claim 7
Dependent Claim
18 words
The filter defined in claim 2 wherein said second elements comprise capacitors and said first elements comprise resistors.
Claim 8
Dependent Claim
38 words
The filter defined in claim 6 wherein said individual resistors have one end connected to one side of said individual switch means, and wherein said plurality of switches has its other ends connected together and to said socket.
Claim 9
Dependent Claim
54 words
The filter defined in claim 7 further including an operational amplifier, means connecting an input of said amplifier to said socket, and means for connecting the output of said amplifier to the output of said socket so that said socket connects said amplifier into said filter selectively to form first and higher order filters.
Claim 10
Dependent Claim
38 words
The filter defined in claim 8 wherein at least some of said switches have their other ends connected to said input of said amplifier, and wherein at least one of said capacitors connects said input to said socket.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |