US3579117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveform generator
Assignee: AT&T Inc
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Filing: 1968-09-27
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Granted: 1971-05-18
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Expires: 1988-09-27
Abstract
Abstract A method and apparatus for time-domain generation of an approximation to an ideal waveform for signaling synchronously via a bandlimited transmission facility is disclosed. The method, which consists of serially gating appropriate waveform segments so as to achieve the desired composite waveform, presents the advantage over prior art that time-domain techniques are invoked in the task of waveform generation, to supplement the work of frequency-domain techniques (filtering).
Inventors
- 👤 Walter E Norris
- 👤 Stephen D Shoap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:47
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
A waveform generator comprising: a source of square wave pulse signals of a first periodicity, a first waveshaping network connected to receive said pulse signals and convert them to an output signal of frequency f1, a square wave pulse generator connected to receive said pulse signals and produce a pulse signal output of a second periodicity, a second waveshaping network connected to receive the output pulses of said pulse generator and convert them to an output signal of frequency f2, a control signal generator connect receive said pulse signals of said first periodicity, and summing means under control of said control signal generator for selectively combining the outputs of said waveshaping networks.
Claim 2
Dependent Claim
112 words
A waveform generator comprising: a source of square wave pulse signals of a first periodicity, a first waveshaping network connected to receive said pulse signals and convert them to an output signal of frequency f1, a square wave pulse generator connected to receive said pulse signals and produce a pulse signal output of a second periodicity, a second waveshaping network connected to receive the output pulses of said pulse generator and convert them to an output signal of frequency f2, a control signal generator connect receive said pulse signals of said first periodicity, and summing means under control of said control signal generator for selectively combining the outputs of said waveshaping networks.
Claim 3
Dependent Claim
23 words
A waveform generator as claimed in claim 1 and further including means for modifying the waveshape of the output of said summing means.
Claim 4
Dependent Claim
123 words
A waveform generator comprising: a source of square wave pulse signals of a first periodicity, a plurality of elementary wave generators connected in parallel to said source of pulse signals, each of said elementary wave generators comprising a frequency divider and a waveshaping network connected to the output of the frequency divider, the frequency divider of each of said elementary wave generators producing a square wave pulse signal output having a periodicity different from the periodicity of the frequency divider outputs of the other elementary wave generators, a control signal generator connected to receive pulse signals of said first periodicity from said source, and summing means under control of said control signal generator for selectively combining the outputs of said elementary wave generators.
Claim 5
Dependent Claim
123 words
A waveform generator comprising: a source of square wave pulse signals of a first periodicity, a plurality of elementary wave generators connected in parallel to said source of pulse signals, each of said elementary wave generators comprising a frequency divider and a waveshaping network connected to the output of the frequency divider, the frequency divider of each of said elementary wave generators producing a square wave pulse signal output having a periodicity different from the periodicity of the frequency divider outputs of the other elementary wave generators, a control signal generator connected to receive pulse signals of said first periodicity from said source, and summing means under control of said control signal generator for selectively combining the outputs of said elementary wave generators.
Claim 6
Dependent Claim
22 words
A waveform generator as claimed in claim 3 wherein each of said waveshaping networks comprises a low pass filter and an amplifier.
References Cited (Backward Citations)
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |