US5528301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Universal video format sample size converter
Assignee: Panasonic Corp of North America
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Filing: 1995-03-31
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Granted: 1996-06-18
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Expires: 2015-03-31
Abstract
Abstract A system and method for converting a first digital input signal having a first sample size per unit length and a first bandwidth to a digital output signal having a second sample size per unit length. The input signal is passed through a first filter means which decimates the signal to a smaller sample size and outputs a decimated signal. A second filter limits that bandwidth of the decimated signal and outputs a bandlimited signal. Next, a third filter interpolates the bandlimited signal to produce a digital output signal having the desired sample size.
Inventors
- 👤 Clarence J.-Y. Hau
- 👤 Kevin J. Stec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:01
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0102
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A video format converter for converting a first digital input signal having a first sample size per unit length and a first bandwidth, to a digital output signal having a second sample size per unit length, comprising: a) first filter means responsive to a first control signal for selectively decimating said first digital input signal to a smaller sample size and outputting a decimated signal; b) second filter means responsive to a second control signal for selectively limiting the bandwidth of said decimated signal and outputting a bandlimited signal; c) third filter means for interpolating and up sampling said bandlimited signal to produce said digital output signal; and d) control means responsive to said first and second sample size per unit length values for generating said first, second and third controls signals.
Claim 2
Dependent Claim
132 words
A video format converter for converting a first digital input signal having a first sample size per unit length and a first bandwidth, to a digital output signal having a second sample size per unit length, comprising: a) first filter means responsive to a first control signal for selectively decimating said first digital input signal to a smaller sample size and outputting a decimated signal; b) second filter means responsive to a second control signal for selectively limiting the bandwidth of said decimated signal and outputting a bandlimited signal; c) third filter means for interpolating and up sampling said bandlimited signal to produce said digital output signal; and d) control means responsive to said first and second sample size per unit length values for generating said first, second and third controls signals.
Claim 3
Dependent Claim
31 words
A video format converter in accordance with claim 1 wherein said first filter means acts as an all pass filter and said decimated signal is equivalent to said first input signal.
Claim 4
Dependent Claim
30 words
A video format converter in accordance with claim 1 wherein said second filter means acts as an all pass filter and said bandlimited signal is equivalent to said decimated signal.
Claim 5
Dependent Claim
47 words
A video format converter in accordance with claim 1 wherein said second filter means and said third filter means comprise a semiconductor chip which operates as said first filter means during a first clock cycle and operates as said third filter means during a second clock cycle.
Claim 6
Dependent Claim
26 words
A video format converter in accordance with claim 1 further comprising processor means for programming one or more of said first, second and third filter means.
Claim 7
Dependent Claim
29 words
A video format converter in accordance with claim 1 further comprising first memory means for storing said decimated signal prior to limiting the bandwidth by said second filter means.
Claim 8
Dependent Claim
27 words
A video format converter in accordance with claim 1 further comprising second memory means for storing said bandlimited signal prior to conversion by said third filter means.
Claim 9
Dependent Claim
26 words
A video format converter in accordance with claim 1 wherein said third filter means interpolates said bandlimiting filter output signal to produce said digital output signal.
Claim 10
Independent Claim
104 words
A method for converting a first digital input signal having a first sample size per unit length and a first bandwidth, to a digital output signal having a second sample size per unit length, comprising the steps of: a) decimating said first digital input signal to a smaller sample size in response to a first control signal and outputting a decimated signal; b) limiting the bandwidth of said decimated signal in response to a second control signal and outputting a bandlimited signal; and c) interpolating and up sampling said bandlimited signal in response to a third control signal to produce said digital output signal.
Claim 11
Independent Claim
104 words
A method for converting a first digital input signal having a first sample size per unit length and a first bandwidth, to a digital output signal having a second sample size per unit length, comprising the steps of: a) decimating said first digital input signal to a smaller sample size in response to a first control signal and outputting a decimated signal; b) limiting the bandwidth of said decimated signal in response to a second control signal and outputting a bandlimited signal; and c) interpolating and up sampling said bandlimited signal in response to a third control signal to produce said digital output signal.
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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) | 1999-06-18 | 1999-12-18 | 2000-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-18 | 2003-12-18 | 2004-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-18 | 2007-12-18 | 2008-06-18 | $7700.00 | Window Closed / Lapsed |