US3639848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transverse digital filter
Assignee: Electronic Communications Inc
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Filing: 1970-02-20
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Granted: 1972-02-01
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Expires: 1990-02-20
Abstract
Abstract A digital transversal filter converts an input analog signal into a plurality of digital components which are transferred into a storage device. Those components are thereafter sequentially multiplied by predetermined coefficients stored in a circulating memory. The combined products of the coefficients and the components constitute an output digital word which is thereafter converted to an analog signal bearing a predetermined functional relationship to the input signal.
Inventors
- 👤 James W Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:19
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A digital filter for producing an output signal having a predetermined desired relation to an input signal, said filter comprising an input terminal for receiving the input analog signal, means coupled to said input terminal for converting the analog signal to a digital signal having a plurality of binary components, first means for storing said binary components, circulating memory means for containing a plurality of predetermined coefficient numbers corresponding to the relation between the output and input signals, means coupled to said first storing means and to said memory means for sequentially forming the respective products of said components and corresponding ones of said coefficient numbers, thereby to form an output digital word, second means coupled to said product forming means for storing the respective products of said components and said coefficient numbers, and means coupled to the output of said second storing means for converting said output digital word to the output signal.
Claim 2
Dependent Claim
154 words
A digital filter for producing an output signal having a predetermined desired relation to an input signal, said filter comprising an input terminal for receiving the input analog signal, means coupled to said input terminal for converting the analog signal to a digital signal having a plurality of binary components, first means for storing said binary components, circulating memory means for containing a plurality of predetermined coefficient numbers corresponding to the relation between the output and input signals, means coupled to said first storing means and to said memory means for sequentially forming the respective products of said components and corresponding ones of said coefficient numbers, thereby to form an output digital word, second means coupled to said product forming means for storing the respective products of said components and said coefficient numbers, and means coupled to the output of said second storing means for converting said output digital word to the output signal.
Claim 3
Dependent Claim
48 words
The digital filter of claim 1, further comprising timing means, and switch means interposed between said input word converting means and said first-mentioned storing means, and responsive to signals from said timing means for periodically coupling and decoupling said input word converting means and said first storing means.
Claim 4
Dependent Claim
69 words
The digital filter of claim 2, in which said timing means further comprises means for supplying, when said first storing means is decoupled from said input word converting means, control signals to said first storing means and said memory means for causing said first storing means and said memory means to respectively sequentially transfer one of said components and one of said coefficient numbers to said product forming means.
Claim 5
Dependent Claim
46 words
The digital filter of claim 3, in which said timing means further comprises means for, when said first storing means is coupled to said input word converting means, providing control signals to the latter for periodically deriving and transferring said components into said first storing means.
Claim 6
Dependent Claim
36 words
The digital filter of claim 2, in which said switch means when operative to decoupled said input word converting means and said storing means, defines means for coupling the input and output of said storing means.
Claim 7
Dependent Claim
37 words
The digital filter of claim 5, in which said storing means comprises shift register means operative as a recirculating unit when its output is coupled to its input in response to the operation of said switch means.
Claim 8
Dependent Claim
35 words
The digital filter of claim 1, further comprising timing means coupled to said first storing means and said memory means for periodically transferring said binary components and said coefficient numbers to said products formIng means.
Claim 9
Dependent Claim
143 words
The digital filter of claim 1, in which said first and second storing means, said memory means, and said product forming means each comprise first and second sections, and including means for transferring a first group of said digital components to the first section of said first storing means and a second portion of said digital components to the second section of said first storing means, the first section of said product forming means defining means for forming the products of the components in said first section of said first storing means and said coefficient numbers in said first section of said memory means, and said second section of said product forming means defining means for forming the products of said components in the second section of said first storing means and said coefficient numbers in the second section of said memory means.
Claim 10
Dependent Claim
59 words
The digital filter of claim 8, further comprising timing means coupled to said storing means and said memory means for periodicially transferring said digital components ans said coefficient numbers in said first and second sections of said first storing means and memory means respectively, to the corresponding one of said first and second sections of said product forming means.
Claim 11
Dependent Claim
61 words
The digital filter of claim 9, further comprising first and second accumulator means respectively coupled to said first and second sections of said product forming means, and summing means interposed between and coupled to said first and second accumulator means and said output work converting means for forming the sum of said products, said products sum defining said output digital word.
References Cited (Backward Citations)
US3314015A
Cited
US3370292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |