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US5436973A
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Pseudo-random signal synthesizer with smooth, flat power spectrum
Assignee: The AT&T MVPD Group LLC
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Filing: 1988-05-09
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Granted: 1995-07-25
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Expires: 2008-05-09
Abstract
Abstract Apparatus and a method are disclosed for synthesizing a pseudorandom communications signal having a smooth, flat, power spectrum. The system comprises frequency modulation circuitry for deriving a first analog signal from a digital encoding signal. The first analog signal is derived to have a substantially constant amplitude and a frequency varying in response to the amplitude of the digital encoding signal. Fourier transform circuitry is connected to the modulation circuitry and is operative to derive a second analog signal from the first analog signal. The resulting second analog signal is the fourier transform of the first analog signal, having a substantially constant power spectral density over the bandwidth of said second analog signal, and having an amplitude that varies in response to the amplitude of the digital encoding signal.
Inventors
- 👤 Frank Amoroso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:24
CPC Classifications
H; H03; H03B; H03B29/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A method of synthesizing a pseudo-random signal having a smooth flat power spectrum comprising: generating a first signal having a substantially constant amplitude and a frequency varying in a pseudo-ransom manner between two frequency limits, the variation in frequency of said first signal being substantially equally distributed between the two frequency limits over time; generating a second signal having an amplitude that varies pseudo-randomly and substantially equally between two amplitude limits; applying said second signal to a voltage controlled oscillator to provide said first signal at the output of said oscillator; and Fourier transforming said first signal to provide said pseudo-random signal.
Claim 2
Independent Claim
102 words
A method of synthesizing a pseudo-random signal having a smooth flat power spectrum comprising: generating a first signal having a substantially constant amplitude and a frequency varying in a pseudo-ransom manner between two frequency limits, the variation in frequency of said first signal being substantially equally distributed between the two frequency limits over time; generating a second signal having an amplitude that varies pseudo-randomly and substantially equally between two amplitude limits; applying said second signal to a voltage controlled oscillator to provide said first signal at the output of said oscillator; and Fourier transforming said first signal to provide said pseudo-random signal.
Claim 3
Independent Claim
86 words
A system for synthesizing a pseudo-random signal having a smooth flat power spectrum comprising: means for generating a first signal having a substantially constant amplitude and a frequency varying in a pseudo-ransom manner; means for generating a second signal having an amplitude that varies pseudo-randomly and substantially equally between two amplitude limits; means for applying said second signal to a voltage controlled-oscillator to provide said first signal at the output of said oscillator; and means for Fourier transforming said first signal to provide said pseudo-random signal.
Claim 4
Independent Claim
86 words
A system for synthesizing a pseudo-random signal having a smooth flat power spectrum comprising: means for generating a first signal having a substantially constant amplitude and a frequency varying in a pseudo-ransom manner; means for generating a second signal having an amplitude that varies pseudo-randomly and substantially equally between two amplitude limits; means for applying said second signal to a voltage controlled-oscillator to provide said first signal at the output of said oscillator; and means for Fourier transforming said first signal to provide said pseudo-random signal.
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) | 1998-07-24 | 1999-01-23 | 1999-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-24 | 2003-01-23 | 2003-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-24 | 2007-01-23 | 2007-07-25 | $7700.00 | Window Closed / Lapsed |