Patent US4999627A successfully refreshed from Google Patents.
US4999627A
Expired / Lapsed
US
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Analog-to-digital converter using prescribed signal components to improve resolution
Assignee: Nokia Bell Labs
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Filing: 1989-09-25
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Granted: 1991-03-12
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Expires: 2009-09-25
Abstract
Abstract An input analog signal having a prescribed component is coverted into an n bit digital signal using low resolution circuitry. An m>n bit digial signal representative of the prescribed component is generated from stored information and past samples of the digital output signal and transformed into a coarsely quanitized analog signal. The prescribed component representative analog signal is subtracted from the input analog signal to form a difference representative signal which is converted into an n-m bit digital signal and them bit digital signal is combined with the n-m bit difference representative signal to produce an n bit digtial signal corresponding to the input analog signal.
Inventors
- 👤 Oscar E. Agazzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:30
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/30; H03M3/322; H03M3/358; H03M3/458
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
162 words
A circuit for converting an analog signal into an n bit digital signal representative thereof comprising: means for receiving an analog signal having a predetermined component, means for storing at least one information signal corresponding to the predetermined component of the received analog signal, the stored information signal comprising a plurality of stored digital signals related to the predetermined component, means comprising a digital filter responsive to the plurality of stored digital signals for forming an m bit digital signal representative of a predetermined of the received analog signal, means for forming an analog signal representative of the difference between the received analog signal and the predetermined component m bit digital signal, means for converting the analog difference representative signal to an n-m bit digital signal, and means jointly responsive to the predetermined component m bit digital signal and the n-m bit digital signal corresponding to the difference representative signal for forming the n bit digital signal representing the received analog signal.
Claim 2
Dependent Claim
162 words
A circuit for converting an analog signal into an n bit digital signal representative thereof comprising: means for receiving an analog signal having a predetermined component, means for storing at least one information signal corresponding to the predetermined component of the received analog signal, the stored information signal comprising a plurality of stored digital signals related to the predetermined component, means comprising a digital filter responsive to the plurality of stored digital signals for forming an m bit digital signal representative of a predetermined of the received analog signal, means for forming an analog signal representative of the difference between the received analog signal and the predetermined component m bit digital signal, means for converting the analog difference representative signal to an n-m bit digital signal, and means jointly responsive to the predetermined component m bit digital signal and the n-m bit digital signal corresponding to the difference representative signal for forming the n bit digital signal representing the received analog signal.
Claim 3
Dependent Claim
81 words
A circuit for converting an analog signal into an n bit digital signal representative thereof according to claim 1 wherein the means for forming an analog signal representative of the difference between the received analog signal and the predetermined component m bit digital signal comprises means responsive to the m bit digital signal and the received analog signal for producing a signal having a quantized component representative of the difference between the m bit digital signal and the received analog signal.
Claim 4
Dependent Claim
91 words
A circuit for converting an analog signal into an n bit digital signal representative thereof according to claim 2 wherein the means for producing a signal having a quantized component representative of the difference between the m bit digital signal and the received analog signal comprises means for forming a charge signal corresponding to each bit of the m bit digital signal, means for forming a charge signal corresponding to the received analog signal, and means for combining the bit corresponding charge signals and the received analog signal corresponding charge signal.
Claim 5
Dependent Claim
54 words
A circuit for converting an analog signal into an n bit digital signal representative thereof according to claims 1, 2 or 3 wherein the difference representative signal forming means further comprises means for amplifying the signal having the quantized component and means for applying the amplified quantized signal to the n-m bit converting means.
Claim 6
Dependent Claim
56 words
A circuit for converting an analog signal into an n digital signal representative thereof according to claim 1 wherein the means for forming the n bit digital signal representing the received analog signal comprises means for summing the m bit predetermined component digital signal and the n-m bit digital signal corresponding to the difference representative signal.
Claim 7
Dependent Claim
179 words
A circuit for converting an analog signal into an n bit digital signal representative thereof according to claim 5 wherein the means for forming an analog signal representative of the difference between the received analog signal and the predetermined component m bit digital signal includes elements causing variations in the difference representative signal, and further comprises means responsive to the n-m bit difference representative signal for generating a set of correction signals representing the variations in the difference representative signal, means connected between the m bit digital signal forming means and the means for summing the m bit predetermined component digital signal and the n-m bit digital signal corresponding to the difference representative signal for combining the m bit digital signal with the correction signals to produce a corrected m bit digital signal, and the means for summing the m bit predetermined component digital signal and the n-m bit digital signal corresponding to the difference representative signal comprises means for adding the corrected m bit digital signal to the n-m bit digital signal corresponding to the difference representative signal.
Claim 8
Independent Claim
125 words
A method for converting an analog signal into an n bit digital signal representative thereof comprising: receiving an input analog signal having a predetermined component, storing an information signal comprising a plurality of stored digital signals corresponding to the predetermined component of the input analog signal, modifying the plurality of stored digital signals to produce an m-bit digital signal representative of the predetermined component, forming an analog signal representative of the difference between the received analog signal and the m bit digital signal, producing an n-m bit digital signal corresponding to the analog difference representative signal, and combining the predetermined component m bit digital signal and the n-m bit difference representative signal to form the n bit digital signal corresponding to the input analog signal.
Claim 9
Independent Claim
125 words
A method for converting an analog signal into an n bit digital signal representative thereof comprising: receiving an input analog signal having a predetermined component, storing an information signal comprising a plurality of stored digital signals corresponding to the predetermined component of the input analog signal, modifying the plurality of stored digital signals to produce an m-bit digital signal representative of the predetermined component, forming an analog signal representative of the difference between the received analog signal and the m bit digital signal, producing an n-m bit digital signal corresponding to the analog difference representative signal, and combining the predetermined component m bit digital signal and the n-m bit difference representative signal to form the n bit digital signal corresponding to the input analog signal.
Claim 10
Dependent Claim
79 words
A method for converting an analog signal into an n bit digital signal representative thereof according to claim 7 wherein the step of forming an analog signal representative of the difference between the received analog signal and the predetermined component m bit digital signal comprises producing a signal having a quantized component representative of the difference between the m bit digital signal and the received analog signal responsive to the m bit digital signal and the received analog signal.
Claim 11
Dependent Claim
85 words
A method for converting an analog signal into an n bit digital signal representative thereof according to claim 8 wherein the step of producing a signal having the quantized component representative of the difference between the m bit digital signal and the received analog signal comprises forming a charge signal corresponding to each bit of the m bit digital signal, forming a charge signal corresponding tot he received analog signal, and combining the bit corresponding charge signals and the received analog signal corresponding charge signal.
Claim 12
Independent Claim
49 words
A method for converting an analog signal into an n bit digital signal representative thereof according to claims 8 or 9 wherein the difference representative signal forming step further comprises amplifying the signal having the quantized component and applying the amplified quantized signal to the n-m bit converting means.
Claim 13
Dependent Claim
64 words
A method or converting an analog signal into an n bit digital signal representative thereof according to claim 7 wherein the step of combining the m bit predetermined component digital signal and the n-m bit digital signal corresponding to the difference representative signal comprises summing the m bit predetermined component digital signal and the n-m bit digital signal corresponding to the difference representative signal.
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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) | 1994-03-11 | 1994-09-10 | 1995-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-11 | 1998-09-10 | 1999-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-11 | 2002-09-10 | 2003-03-12 | $7700.00 | Window Closed / Lapsed |