US3649922A
Expired / Lapsed
US
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Digital waveform generator
Assignee: International Standard Electric Corp
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Filing: 1969-06-19
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Granted: 1972-03-14
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Expires: 1989-06-19
Abstract
Abstract A digital waveform generator is provided for synthesizing a digital waveform having only the fundamental and prescribed harmonic components present. Additionally, a frequency translation system is provided for selecting a band of frequencies from a given input spectrum and to translate it, either erect or inverted, to a new frequency band. This system is application to both N-path filters or modulators and to R-C digital filters.
Inventors
- 👤 Frank Ralph
- 👤 Michael John Gingell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:15
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/02; H03K4/026; G; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/28; H03K5/00; H03K5/01; H03K6/00; H03B; H03B21/00; H03B27/00; H03C; H03C1/00; H03C1/52; H03C1/60; H03D; H03D7/00; H03D7/16; H03D7/161; H03D7/163
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
205 words
A frequency translation system comprising: N-paths which are identical and connected in parallel; each of said paths having at least one input modulator unit, a filter unit and at least one output modulator unit; each of said input modulator units sampling, in turn, input signals over a given input frequency spectrum, in accordance with a predetermined switching function; said output and input modulator units being unbalanced; means for connecting the outputs of each of said paths to a summation unit for producing signals having frequency spectrums which are either erect or invert translations of said input signals; and wherein said predetermined switching function for said input modulators is provided by a synthesized waveform produced by a method including the steps of providing a first repetitive signal of fundamental period T which is used as the basic waveform, and a second identical repetitive signal delayed in time with respect to said first repetitive signal by an amount T/N, adding said first and second repetitive signals to provide a resulting waveform having the N/2th harmonic component eliminated, wherein any further harmonic components may be eliminated by successively repeating the summation step using in each case the resulting waveform from the preceding summation step as the basic waveform.
Claim 2
Dependent Claim
205 words
A frequency translation system comprising: N-paths which are identical and connected in parallel; each of said paths having at least one input modulator unit, a filter unit and at least one output modulator unit; each of said input modulator units sampling, in turn, input signals over a given input frequency spectrum, in accordance with a predetermined switching function; said output and input modulator units being unbalanced; means for connecting the outputs of each of said paths to a summation unit for producing signals having frequency spectrums which are either erect or invert translations of said input signals; and wherein said predetermined switching function for said input modulators is provided by a synthesized waveform produced by a method including the steps of providing a first repetitive signal of fundamental period T which is used as the basic waveform, and a second identical repetitive signal delayed in time with respect to said first repetitive signal by an amount T/N, adding said first and second repetitive signals to provide a resulting waveform having the N/2th harmonic component eliminated, wherein any further harmonic components may be eliminated by successively repeating the summation step using in each case the resulting waveform from the preceding summation step as the basic waveform.
Claim 3
Dependent Claim
154 words
An R-C digital filter comprising: N capacitors bridging a line; switching means in series with each of said N capacitors; means for closing each of said switching means individually and sequentially for a period T/N wherein T is the period of oscillation of a signal, means for controlling the switching function for each of said switching means responsive to a synthesized waveform produced by a method including the steps of providing a first repetitive signal of fundamental period T which is used as the basic waveform, and a second identical repetitive signal delayed in time with respect to said first repetitive signal by an amount T/N, adding said first and second repetitive signals to provide a resulting waveform having the N/2th harmonic component eliminated, wherein any further harmonic components may be eliminated by successively repeating the summation step using in each case the resulting waveform from the preceding summation step as the basic waveform.
Claim 4
Dependent Claim
154 words
An R-C digital filter comprising: N capacitors bridging a line; switching means in series with each of said N capacitors; means for closing each of said switching means individually and sequentially for a period T/N wherein T is the period of oscillation of a signal, means for controlling the switching function for each of said switching means responsive to a synthesized waveform produced by a method including the steps of providing a first repetitive signal of fundamental period T which is used as the basic waveform, and a second identical repetitive signal delayed in time with respect to said first repetitive signal by an amount T/N, adding said first and second repetitive signals to provide a resulting waveform having the N/2th harmonic component eliminated, wherein any further harmonic components may be eliminated by successively repeating the summation step using in each case the resulting waveform from the preceding summation step as the basic waveform.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |