US4366547A
Expired / Lapsed
US
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Digital filter with scaled tap coefficients
Assignee: Motorola Solutions Inc
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Filing: 1980-09-18
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Granted: 1982-12-28
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Expires: 2000-09-18
Abstract
Abstract Modem circuitry for processing data signals, featuring a digital filter whose tap coefficients are all scaled by a common factor such that the most significant bits of the filter output are indicative of the digital data.
Inventors
- 👤 Charles K. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:22
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/0223; H03H17/0227
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
Modem circuitry for processing signals representing digital data, comprising sampling means for providing a stream of samples of said signals, storage means connected to receive from said sampling means and to store a set of said samples, arithmetic means responsive to said storage means and connected to multiply each said sample by a tap coefficient drawn from a set of scaled tap coefficients and to add the resulting products to form a multiple-bit value, and comparator means responsive to said arithmetic means and connected to compare a predetermined group of the bits of said multiple-bit value with a threshold value to produce an output signal, said group being selected from a set consisting of fewer than all the bits in said multiple-bit value.
Claim 2
Dependent Claim
123 words
Modem circuitry for processing signals representing digital data, comprising sampling means for providing a stream of samples of said signals, storage means connected to receive from said sampling means and to store a set of said samples, arithmetic means responsive to said storage means and connected to multiply each said sample by a tap coefficient drawn from a set of scaled tap coefficients and to add the resulting products to form a multiple-bit value, and comparator means responsive to said arithmetic means and connected to compare a predetermined group of the bits of said multiple-bit value with a threshold value to produce an output signal, said group being selected from a set consisting of fewer than all the bits in said multiple-bit value.
Claim 3
Dependent Claim
22 words
The modem circuitry of claim 1 wherein said set excludes at least one of the least significant bits of said multiple-bit value.
Claim 4
Dependent Claim
20 words
The modem circuitry of claim 1 wherein said set excludes all but the most significant bit of said multiple-bit value.
Claim 5
Dependent Claim
24 words
The modem circuitry of claim 1 wherein the value of the bits in said set and the threshold value are both powers of two.
Claim 6
Dependent Claim
26 words
The modem circuitry of claim 1 wherein there are N said scaled tap coefficients, where N is an integer and said coefficients satisfy the equation ##EQU4##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |