US3967099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter having frequency-dependent transmission properties for electric analog signals
Assignee: Siemens AG
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Filing: 1973-10-01
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Granted: 1976-06-29
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Expires: 1993-10-01
Abstract
Abstract In one illustrative embodiment, a basic filter circuit for discrete signals is provided corresponding in filter function to an analog ladder network containing inductive and capacitive components. The reactive components of the analog filter structure are realized in the basic filter circuit as one-port and two-port elements having time delay, while non-reactive components of the analog filter are realized as time-delay-free one-port and plural-port elements. Interface means connect the port elements together in a configuration corresponding to the configuration of the analog filter, with sets of adder and multiplier means of the interface circuitry which couple successive sets of the port elements to each other being correlated with the connective relationship (whether series, series-parallel or parallel) between the corresponding components or branches of the analog filter and with the parameters of the analog components, so that the basic filter circuit essentially simulates the analog filter structure in its filter characteristics.
Inventors
- 👤 Alfred Fettweis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:57
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/0201
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
436 words
A filter having a filter function for discrete electric signals corresponding to the frequency-dependent transmission properties for electric analog signals of an analog LC-network of predetermined configuration and having predetermined impedance-representing constants, said filter comprising a. a basic filter circuit having a plurality of port elements with ports each including a port input and a port output, b. at least one of said port elements being a one-port element, said one-port element comprising time delay means having a predetermined time delay, said time delay means being connected between the port input and the port output of the one-port element and being operable for receiving an input signal from the port input of the one-port element, and for supplying an output signal to the port output of the one-port element in accordance with said input signal but delayed by said predetermined time delay; c. said plurality of port elements of said basic filter circuit comprising further port element means including further port input means and further port output means, and d. said basic filter circuit comprising interface device means interconnecting said port elements, said interface device means having a set of interface ports comprising first and second interface ports each with an interface port input and an interface port output, the interface port input and the interface port output of the first interface port being connected respectively with the further port output means and the further port input means of the further port element means, and the interface port output and the interface port input of the second interface port being connected respectively with the port input and the port output of said one-port element, e. said interface device means comprising interface circuitry including adder means and multiplier means connected with the set of interface ports and connecting the interface ports of the set together in a connective relationship which is in accordance with the configuration of said analog LC-network, f. said interface circuitry having a multiplier coefficient for each said multiplier means correlated with the connective relationship of said set of interface ports and with the impedance-representing constants of analog components of the LC-network corresponding to the port elements interconnected by said set of interface ports, and g. said further port element means comprising further time delay means providing a further time delay which is a function of said predetermined time delay, said further time delay means being interposed in said further port element means so as to be in series with said interface circuitry to prevent the existence of a feedback loop without time delay via said further port element means and said interface circuitry.
Claim 2
Dependent Claim
436 words
A filter having a filter function for discrete electric signals corresponding to the frequency-dependent transmission properties for electric analog signals of an analog LC-network of predetermined configuration and having predetermined impedance-representing constants, said filter comprising a. a basic filter circuit having a plurality of port elements with ports each including a port input and a port output, b. at least one of said port elements being a one-port element, said one-port element comprising time delay means having a predetermined time delay, said time delay means being connected between the port input and the port output of the one-port element and being operable for receiving an input signal from the port input of the one-port element, and for supplying an output signal to the port output of the one-port element in accordance with said input signal but delayed by said predetermined time delay; c. said plurality of port elements of said basic filter circuit comprising further port element means including further port input means and further port output means, and d. said basic filter circuit comprising interface device means interconnecting said port elements, said interface device means having a set of interface ports comprising first and second interface ports each with an interface port input and an interface port output, the interface port input and the interface port output of the first interface port being connected respectively with the further port output means and the further port input means of the further port element means, and the interface port output and the interface port input of the second interface port being connected respectively with the port input and the port output of said one-port element, e. said interface device means comprising interface circuitry including adder means and multiplier means connected with the set of interface ports and connecting the interface ports of the set together in a connective relationship which is in accordance with the configuration of said analog LC-network, f. said interface circuitry having a multiplier coefficient for each said multiplier means correlated with the connective relationship of said set of interface ports and with the impedance-representing constants of analog components of the LC-network corresponding to the port elements interconnected by said set of interface ports, and g. said further port element means comprising further time delay means providing a further time delay which is a function of said predetermined time delay, said further time delay means being interposed in said further port element means so as to be in series with said interface circuitry to prevent the existence of a feedback loop without time delay via said further port element means and said interface circuitry.
Claim 3
Dependent Claim
66 words
A filter as claimed in claim 1, with said plurality of port elements comprising a second one-port element in addition to the first-mentioned one-port element, said second one-port element comprising second time delay means having a time delay in accordance with said predetermined time delay, and said second time delay means being connected between the port input and the port output of the second one-port element.
Claim 4
Dependent Claim
50 words
A filter as claimed in claim 1, with said one-port element having said time delay means corresponding in filter function to an inductive component of the corresponding LC-network, said one-port element comprising in addition to said time delay means, a sign inverter connected in series with said time delay means.
Claim 5
Dependent Claim
36 words
A filter as claimed in claim 1, with said one-port element having said time delay means corresponding in filter function to a capacitive component of the corresponding LC-network, and consisting essentially of said time delay means.
Claim 6
Dependent Claim
111 words
A filter as claimed in claim 1, with said further port element means comprising a plural-port element, said pluralport element having a plurality of ports comprising a first port providing a first port input means and a first port output means, and comprising a further port providing the aforementioned further port input means and further port output means, said further time delay means being interposed in series between said port input means and said port output means of said first and said further ports so as to be in series with the interface circuitry connected between said further port output means and said further port input means of said further port.
Claim 7
Dependent Claim
150 words
A filter as claimed in claim 1, with said further port element means consisting of a two-port element having only a first port providing a first port input means and a first port output means, and a further port providing said further port input means and said further port output means, said two-port element comprising a first transmission path extending from the first port input means to the further port output means, part of said further time delay means being a further time delay means in said first transmission path for providing one-half of said further time delay, said two-port element further comprising a second transmission path extending from the further port input means to the first port output means, and another part of said further time delay means being a further time delay means in said second transmission path for providing the other half of said further time delay.
Claim 8
Dependent Claim
104 words
A filter as claimed in claim 6 with said interface device means comprising a set of further interface ports including one further interface port with an interface port output connected with the first port input means of the first port of said further port element means and with an interface port input connected with the first port output means of the first port of said further port element means, the interface device means comprising further interface circuitry including further adder means and further multiplier means connecting the further interface ports together in a connective relationship in accordance with the configuration of said analog LC-network.
Claim 9
Dependent Claim
38 words
A filter as claimed in claim 1, with said basic filter circuit having a time-delay-free one-port element terminating said basic filter circuit and comprising a wave sink corresponding in function to a resistance termination of the analog LC-network.
Claim 10
Dependent Claim
40 words
A filter as claimed in claim 1, with said basic filter circuit having a time-delay-free one-port element connected as input thereto and comprising a wave source corresponding in function to a voltage source connected as input to the analog LC-network.
Claim 11
Dependent Claim
65 words
A filter as claimed in claim 1, with a time-delay-free multiport element forming part of said basic filter circuit and having at least three ports each having a port input and a port output, and connecting means connecting a port output of each port to a port input of an adjacent port, said multiport element corresponding in function to a circulator of the analog LC-network.
Claim 12
Dependent Claim
194 words
A filter as claimed in claim 1, with the interface circuitry providing a series-parallel connective relationship between the first and second interface ports, and further comprising a sign inverter; the adder means comprising: a first adder having respective first adder inputs one connected via said sign inverter with the interface port input of the first interface port, and the other connected with the interface port input of the second interface port, and having a first adder output; a second adder having respective second adder inputs one connected to the interface port input of the first interface port, and a second adder output; and a third adder having third adder inputs, one connected to the interface port input of the second interface port, and a third adder output; the multiplier means comprising a multiplier having an input connected to the first adder output, and having an output connected in common to the other second adder input and the other third adder input, the interface port output of the first interface port being connected to the third adder output and the interface port output of the second inter port being connected to the second adder output.
Claim 13
Dependent Claim
58 words
A filter as claimed in claim 1, with said plurality of port elements comprising at least one further one-port element having one port and corresponding in function to a further component of the analog LC-network, and at least one multiport element having at least three ports and corresponding in function to a multiport component of the analog LC-network.
Claim 14
Dependent Claim
86 words
A filter as claimed in claim 12 with said interface device means having a set of further interface ports including a first further interface port connected with one of the ports of said multiport element and including a second further interface port connected with the port of said further one-port element, the interface device means comprising further interface circuitry including further adder means and further multiplier means connecting the further interface ports together in a connective relationship in accordance with the configuration of the analog LC-network.
Claim 15
Dependent Claim
74 words
A filter as claimed in claim 1, wherein the interface device means comprises a multiport interface means having at least three ports with respective different R k values assigned thereto in accordance with impedance-representing constants of analog components of the LC-network, and said multiport interface means having adder means and multiplier means including a plurality of multipliers connected with the ports thereof and having multiplier coefficients correlated with the respective different R k values.
Claim 16
Dependent Claim
24 words
A filter as claimed in claim 14, with the multiport interface means having a number of multipliers less than the number of ports thereof.
Claim 17
Dependent Claim
91 words
A filter as claimed in claim 15, with said multiport interface means having at least three ports with respective different R k values and including a dependent port which is associated with substantially a highest one of a set of multiplier coefficients which are determined by the respective R k values of the ports of the multiport interface means prior to selection of the dependent port, said dependent port having the port input thereof coupled with the adder means of said multiport interface means but not having a multiplier associated therewith.
Claim 18
Dependent Claim
72 words
A filter as claimed in claim 1, wherein the interface device means comprises a multiport interface means with a number of interface ports equal to n having respective R k values assigned thereto in accordance with impedance-representing constants of analog components of the LC-network and including multiplier means providing a number of multipliers equal to n minus one, and with multiplier coefficients for the multipliers being correlated with said R k values.
Claim 19
Dependent Claim
40 words
A filter as claimed in claim 1, wherein the interface device means comprises a multiport interface means with a number of interface ports equal to n and with multiplier means including a number of multipliers less than n minus one.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |