US3983495A
Expired / Lapsed
US
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Digital waveform generator
Assignee: International Telephone and Telegraph Corp
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Filing: 1975-09-29
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Granted: 1976-09-28
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Expires: 1995-09-29
Abstract
Abstract This generator generates COS(w o + w m )t, SIN(w o + w m )t, COS(w o - w m )t and SIN(w o - w m )t square wave waveforms. This is accomplished by inserting into a carrier square wave clock pulse stream one pulse with the cooperation of a modulation square wave clock in a first signal channel and by deleting from the carrier square wave clock pulse stream one pulse with the cooperation of the modulation square wave clock in a second signal channel. The resultant pulse stream in the first signal channel is suitably divided in a first binary divider and then further divided by a factor of two in a second binary divider to generate the COS(w o + w m )t waveform. The complement of the output waveform of the first binary divider is further divided by a factor of two in a third binary divider to generate the SIN(w o + w m )t waveform. The resultant pulse stream in the second signal channel is similarly operated on to generate the COS(w o - w m )t and SIN(w o - w m )t waveforms.
Inventors
- 👤 Marvin Aaron Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:03
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/227
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
292 words
A digital waveform generator to generate COS(w o + w m )t, SIN(w o + w m )t, COS(w o - w m )t and SIN(w o - w m )t square wave waveforms comprising: a first source to provide a first square wave pulse stream having a first given frequency; a second source to provide a second square wave pulse stream having a second given frequency less than said first given frequency; first means coupled to said first and second sources to periodically insert one additional pulse into said first pulse stream to provide a first resultant pulse stream; second means coupled to said first and second sources to periodically delete one pulse from said first pulse stream to provide a second resultant pulse stream; third means coupled to said first means to divide said first resultant pulse stream by a first given division factor; fourth means coupled to said third means to divide said divided first resultant pulse stream by a factor of two to generate said COS(w o + w m )t waveform; fifth means coupled to said third means to divide the complement of said divided first resultant pulse stream by a factor of two to generate said SIN(w o + w m )t waveform; sixth means coupled to said second means to divide said second resultant pulse stream by a second given division factor; seventh means coupled to said sixth means to divide said divided second resultant pulse stream by a factor of two to generate said COS(w o - w m )t waveform; and eighth means coupled to said sixth means to divide the complement of said divided second pulse stream by a factor of two to generate said SIN(w o - w m )t waveform.
Claim 2
Dependent Claim
292 words
A digital waveform generator to generate COS(w o + w m )t, SIN(w o + w m )t, COS(w o - w m )t and SIN(w o - w m )t square wave waveforms comprising: a first source to provide a first square wave pulse stream having a first given frequency; a second source to provide a second square wave pulse stream having a second given frequency less than said first given frequency; first means coupled to said first and second sources to periodically insert one additional pulse into said first pulse stream to provide a first resultant pulse stream; second means coupled to said first and second sources to periodically delete one pulse from said first pulse stream to provide a second resultant pulse stream; third means coupled to said first means to divide said first resultant pulse stream by a first given division factor; fourth means coupled to said third means to divide said divided first resultant pulse stream by a factor of two to generate said COS(w o + w m )t waveform; fifth means coupled to said third means to divide the complement of said divided first resultant pulse stream by a factor of two to generate said SIN(w o + w m )t waveform; sixth means coupled to said second means to divide said second resultant pulse stream by a second given division factor; seventh means coupled to said sixth means to divide said divided second resultant pulse stream by a factor of two to generate said COS(w o - w m )t waveform; and eighth means coupled to said sixth means to divide the complement of said divided second pulse stream by a factor of two to generate said SIN(w o - w m )t waveform.
Claim 3
Dependent Claim
24 words
A generator according to claim 1, wherein said first means inserts said one additional pulse at a rate proportional to said second given frequency.
Claim 4
Dependent Claim
23 words
A generator according to claim 1, wherein said second means deletes said one pulse at a rate proportional to said second given frequency.
Claim 5
Dependent Claim
24 words
A generator according to claim 3, wherein said first means inserts said one additional pulse at a rate proportional to said second given frequency.
Claim 6
Dependent Claim
135 words
A generator according to claim 1, wherein said first means includes a first binary divider coupled to said first source to divide said first pulse stream by a factor of two, a first inverting means coupled to said first source to invert said first pulse stream, a second binary divider coupled to said second source to divide said second pulse stream by a factor of two, a first D-type flip-flop having a 1 output coupled to said first inverting means and said second binary divider, said first flip-flop having the output signal from said second binary divider clocked to said 1 output of said first flip-flop by the output signal of said inverting means, and a modulo-2 adder coupled to said first binary divider and said 1 output to provide said first resultant pulse stream.
Claim 7
Dependent Claim
79 words
A generator according to claim 5, wherein said second means includes a second D-type flip-flop having a 0 output coupled to said first and second sources, said second flip-flop having said second pulse stream clocked to said 0 output by said first pulse stream, an AND gate coupled to said 0 output and said second source, and an OR gate coupled to said first source and the output of said AND gate to provide said second resultant pulse stream.
Claim 8
Dependent Claim
79 words
A generator according to claim 6, wherein said first given frequency is nf o , where n is an integer greater than one and f o is a selected carrier frequency, said second given frequency is nf m , where f m is a selected modulation frequency, said third means is a first binary divider and said first given division factor is n/4, and said sixth means is a second binary divider and said second given factor is n/2.
Claim 9
Dependent Claim
23 words
A generator according to claim 7, wherein said fifth means includes a second inverter means coupled to the output of said third means.
Claim 10
Dependent Claim
23 words
A generator according to claim 8, wherein said eighth means includes a second inverter means coupled to the output of said sixth means.
Claim 11
Dependent Claim
80 words
A generator according to claim 5, wherein said first given frequency is nf o , where n is an integer greater than one and f o is a selected carrier frequency, said second given frequency is nf m , where f m is a selected modulation frequency, said third means is a first binary divider and said first given division factor is n/4, and said sixth means is a second binary divider and said second given division factor is n/2.
Claim 12
Dependent Claim
23 words
A generator according to claim 10, wherein said fifth means includes a first inverter means coupled to the output of said third means.
Claim 13
Dependent Claim
23 words
A generator according to claim 11, wherein said eighth means includes a second inverter means coupled to the output of said sixth means.
Claim 14
Dependent Claim
77 words
A generator according to claim 1, wherein said second means includes a D-type flip-flop having a 0 output coupled to said first and second sources, said flip-flop having said second pulse stream clocked to said 0 output by said first pulse stream, an AND gate coupled to said 0 output and said second source, and an OR gate coupled to said first source and the output of said AND gate to provide said second resultant pulse stream.
Claim 15
Dependent Claim
80 words
A generator according to claim 13, wherein said first given frequency is nf o , where n is an integer greater than one and f o is a selected carrier frequency, said second given frequency is nf m , where f m is a selected modulation frequency, said third means is a first binary divider and said first given division factor is n/4, and said sixth means is a second binary divider and said second given division factor is n/2.
Claim 16
Dependent Claim
23 words
A generator according to claim 14, wherein said fifth means includes a first inverter means coupled to the output of said third means.
Claim 17
Dependent Claim
23 words
A generator according to claim 15, wherein said eighth means includes a second inverter means coupled to the output of said sixth means.
Claim 18
Dependent Claim
80 words
A generator according to claim 1, wherein said first given frequency is nf o , where n is an integer greater than one and f o is a selected carrier frequency, said second given frequency is nf m , where f m is a selected modulation frequency, said third means is a first binary divider and said first given division factor is n/4, and said sixth means is a second binary divider and said second given division factor is n/2.
Claim 19
Dependent Claim
23 words
A generator according to claim 17, wherein said fifth means includes a first inverter means coupled to the output of said third means.
Claim 20
Dependent Claim
23 words
A generator according to claim 18, wherein said eighth means includes a second inverter means coupled to the output of said sixth means.
Claim 21
Dependent Claim
23 words
A generator according to claim 1, wherein said fifth means includes a first inverter means coupled to the output of said third means.
Claim 22
Dependent Claim
23 words
A generator according to claim 20, wherein said eighth means includes a second inverter means coupled to the output of said sixth means.
Claim 23
Dependent Claim
22 words
A generator according to claim 1, wherein said eighth means includes an inverter means coupled to the output of said sixth means.
References Cited (Backward Citations)
US3581115A
Cited
US3740660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |