Patent US5495554A successfully refreshed from Google Patents.
US5495554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analog wavelet transform circuitry
Assignee: IXYS Intl Ltd
•
Filing: 1993-01-08
•
Granted: 1996-02-27
•
Expires: 2013-01-08
Abstract
Abstract An analog circuit implementing a continuous wavelet transform forms a multiplicity of analog wavelet outputs. These analog wavelet outputs can be used for data compression. This analog circuit is estimated to be about one-hundredth (1/100) the size and power of a digital wavelet transform circuit. Additionally, the analog wavelet outputs of the analog wavelet transform chip is directly determined without the loss of information due to the digital sampling.
Inventors
- 👤 R. Timothy Edwards
- 👤 Michael D. Godfrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:38
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1217; H03H11/1252; G; G06; G06F; G06F17/00; G06F17/10; G06F17/14; G06G; G06G7/00; G06G7/12; G06G7/26; G06T; G06T9/00; G06T9/007; H03B; H03B5/00; H03B5/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
61 words
An analog circuit comprising: modulating means for modulating a input signal with sinusoidal signals of different frequencies to form analog modulated signals, and a bank of analog filters connected to receive said analog modulated signals from said modulating means, said bank of analog filters producing a multiplicity of analog wavelet outputs, said bank of analog filters comprising substantially half-Gaussian shaped filters.
Claim 2
Dependent Claim
61 words
An analog circuit comprising: modulating means for modulating a input signal with sinusoidal signals of different frequencies to form analog modulated signals, and a bank of analog filters connected to receive said analog modulated signals from said modulating means, said bank of analog filters producing a multiplicity of analog wavelet outputs, said bank of analog filters comprising substantially half-Gaussian shaped filters.
Claim 3
Dependent Claim
23 words
The analog circuit of claim 1, wherein each filter of said bank of analog filters comprises a cascade of a number of follower-integrators.
Claim 4
Dependent Claim
12 words
The analog circuit of claim 1, wherein said modulating means comprises multipliers.
Claim 5
Dependent Claim
44 words
The analog circuit of claim 1 further comprising sinusoidal signal production means for producing said sinusoidal signals, said sinusoidal signal production means comprising divide-by-n circuits and low pass filters in a manner that the sinusoidal signals have frequencies that differ on a logarithmic scale.
Claim 6
Dependent Claim
16 words
The analog circuit of claim 4, wherein said sinusoidal signal production means further includes an oscillator.
Claim 7
Dependent Claim
18 words
The analog circuit of claim 4, wherein said sinusoidal signal production means further includes attenuate and bias circuitry.
Claim 8
Dependent Claim
44 words
The analog circuit of claim 4, wherein said sinusoidal signal production means includes phase shifting circuitry to produce two sinusoidal signals with each of the frequencies wherein one of the two sinusoidal signals is phase shifted from the other of the two sinusoidal signals.
Claim 9
Dependent Claim
22 words
The analog circuit of claim 1, further comprising circuitry for forming a reconstituted analog input signal from a multiplicity of analog signals.
Claim 10
Dependent Claim
17 words
The analog circuit of claim 8, wherein said reconstituted input signal forming circuitry comprises multipliers and summers.
Claim 11
Dependent Claim
30 words
The analog circuit of claim 9, further comprising a sinusoidal signal producing means for producing sinusoidal signals, wherein said multipliers receive said sinusoidal signals and said multiplicity of analog signals.
Claim 12
Dependent Claim
36 words
The analog circuit of claim 8, further comprising a sampler for sampling said analog wavelet outputs, an processor for encoding the sampled output and for decoding the sampled output to produce said multiplicity of analog signals.
References Cited (Backward Citations)
US4449209A
Cited
US4817182A
Cited
US5124930A
Cited
US4974187A
Cited
US5014134A
Cited
US5101446A
Cited
US5262958A
Cited
US5214708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-26 | 1999-08-28 | 2000-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-26 | 2003-08-28 | 2004-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-26 | 2007-08-28 | 2008-02-27 | $7700.00 | Window Closed / Lapsed |