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US5543859A
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Horizontal contour emphasizing signal processor
Assignee: Panasonic Holdings Corp
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Filing: 1995-04-06
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Granted: 1996-08-06
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Expires: 2015-04-06
Abstract
Abstract An improved horizontal contour emphasizing signal processor is provided with a detector to detect a period during which luminance signal changes are produced, a generator to generate a rectangular-wave signal during this period, and a multiplier for multiplying a first horizontal contour emphasizing signal derived from the luminance signal to the rectangular-wave signal to generate a second horizontal contour emphasizing signal, and in this case, a preshoot is added to the input luminance signal waveform at the starting part of a radical waveform change and an overshoot is added at the ending part of the waveform change in order to perform finer horizontal contour emphasizing.
Inventors
- 👤 Minoru Miyata
- 👤 Shigeru Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:38
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
105 words
A horizontal contour emphasizing signal processor in which an input luminance signal is converted to a first horizontal contour emphasizing signal, further comprising: detector means for detecting a period during which a change in the input luminance signal occurs, signal generator means for generating a generated signal during said period, multiplication means for multiplying said first horizontal contour emphasizing signal by said generated signal to produce a second horizontal contour emphasizing signal, delay means for delaying the input luminance signal for a predetermined period, and synthesizinq means for adding said second horizontal contour emphasizing signal to the input luminance signal delayed by said delay means.
Claim 2
Dependent Claim
105 words
A horizontal contour emphasizing signal processor in which an input luminance signal is converted to a first horizontal contour emphasizing signal, further comprising: detector means for detecting a period during which a change in the input luminance signal occurs, signal generator means for generating a generated signal during said period, multiplication means for multiplying said first horizontal contour emphasizing signal by said generated signal to produce a second horizontal contour emphasizing signal, delay means for delaying the input luminance signal for a predetermined period, and synthesizinq means for adding said second horizontal contour emphasizing signal to the input luminance signal delayed by said delay means.
Claim 3
Dependent Claim
179 words
A horizontal contour emphasizing signal processor comprising; a first delay-circuit delaying an input luminance signal for an arbitrary period, a second delay-circuit delaying the output signal of the first delay-circuit for the arbitrary period, a first subtraction circuit subtracting the output-signal of said first delay-circuit from the input-signal of said first delay-circuit, a second subtraction circuit subtracting the output-signal of second delay-circuit from the input signal of said second delay-circuit, a first multiplication circuit multiplying the output-signal of the first subtraction circuit to the output-signal of the second subtraction circuit, a second multiplication circuit obtaining a power of the output-signal of said first multiplication circuit, a limiter limiting the amplitude of said power of the output-signal obtained by said second multiplication circuit, a third subtraction circuit subtracting the output-signal of said second subtraction circuit from the output-signal of said first subtraction circuit, a third multiplication circuit multiplying the output-signal of said third subtraction circuit to the output-signal of said limiter, and a synthesizing circuit combining the output-signal of said third multiplication circuit to the output-signal of said first delay-circuit.
Claim 4
Dependent Claim
179 words
A horizontal contour emphasizing signal processor comprising; a first delay-circuit delaying an input luminance signal for an arbitrary period, a second delay-circuit delaying the output signal of the first delay-circuit for the arbitrary period, a first subtraction circuit subtracting the output-signal of said first delay-circuit from the input-signal of said first delay-circuit, a second subtraction circuit subtracting the output-signal of second delay-circuit from the input signal of said second delay-circuit, a first multiplication circuit multiplying the output-signal of the first subtraction circuit to the output-signal of the second subtraction circuit, a second multiplication circuit obtaining a power of the output-signal of said first multiplication circuit, a limiter limiting the amplitude of said power of the output-signal obtained by said second multiplication circuit, a third subtraction circuit subtracting the output-signal of said second subtraction circuit from the output-signal of said first subtraction circuit, a third multiplication circuit multiplying the output-signal of said third subtraction circuit to the output-signal of said limiter, and a synthesizing circuit combining the output-signal of said third multiplication circuit to the output-signal of said first delay-circuit.
Claim 5
Dependent Claim
23 words
A horizontal contour emphasizing signal processor according to claim 2 wherein; the power multiplication of said second multiplication circuit is an even degree.
Claim 6
Dependent Claim
164 words
A horizontal contour emphasizing signal processor comprising; a first delay-circuit delaying an input luminance signal for an arbitrary period, a second delay-circuit delaying the output-signal of said first delay circuit for the arbitrary period, a first subtraction circuit subtracting the output-signal of said first delay-circuit from the input-signal of said first delay-circuit, a second subtraction circuit subtracting the output-signal of said second delay-circuit from the input-signal of said second delay-circuit, a third subtraction circuit subtracting the output-signal of said second subtraction circuit from the output-signal of said first subtraction circuit, a differential circuit differentiating the output-signal of said first delay-circuit, a first multiplication circuit obtaining a power of the output-signal of said differential circuit, a limiter limiting the amplitude of output signal of said first multiplication circuit, a second multiplication circuit multiplying the output of said third subtraction circuit to the output-signal of said limiter, and a synthesizing circuit synthesizing the output-signal of said second multiplication circuit with the output-signal of said first delay-circuit.
Claim 7
Dependent Claim
164 words
A horizontal contour emphasizing signal processor comprising; a first delay-circuit delaying an input luminance signal for an arbitrary period, a second delay-circuit delaying the output-signal of said first delay circuit for the arbitrary period, a first subtraction circuit subtracting the output-signal of said first delay-circuit from the input-signal of said first delay-circuit, a second subtraction circuit subtracting the output-signal of said second delay-circuit from the input-signal of said second delay-circuit, a third subtraction circuit subtracting the output-signal of said second subtraction circuit from the output-signal of said first subtraction circuit, a differential circuit differentiating the output-signal of said first delay-circuit, a first multiplication circuit obtaining a power of the output-signal of said differential circuit, a limiter limiting the amplitude of output signal of said first multiplication circuit, a second multiplication circuit multiplying the output of said third subtraction circuit to the output-signal of said limiter, and a synthesizing circuit synthesizing the output-signal of said second multiplication circuit with the output-signal of said first delay-circuit.
Claim 8
Dependent Claim
23 words
A horizontal contour emphasizing signal processor according to claim 4 wherein; the power multiplication of said first multiplication circuit is an even degree.
Claim 9
Dependent Claim
38 words
A horizontal contour emphasizing signal processor according to claim 4 wherein; a selection circuit selecting the output-signal of said differential circuit according to the luminance signal provided in-between said differential circuit and said first multiplication circuit, is provided.
Claim 10
Dependent Claim
32 words
A horizontal contour emphasizing signal processor according to claim 6 wherein; said selection circuit selecting the output-signal of said differential circuit having an amplitude larger than a predetermined threshold value, is provided.
Claim 11
Dependent Claim
32 words
A horizontal contour emphasizing signal processor according to claim 6 wherein; said selection circuit selecting the output-signal of said differential circuit having a duration longer than a predetermined threshold value, is provided.
Claim 12
Dependent Claim
43 words
A horizontal contour emphasizing signal processor according to claim 7; wherein a means to instruct the threshold value of output-signal amplitude of said differential circuit having an amplitude larger than a predetermined value to select the output-signal of said differential circuit, is provided.
Claim 13
Dependent Claim
37 words
A horizontal contour emphasizing signal processor according to claim 8 wherein; a means to instruct the threshold-value of the output signal width of said differential circuit to select the output signal of said differential circuit, is provided.
References Cited (Backward Citations)
US4994915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-06 | 2000-02-05 | 2000-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-06 | 2004-02-05 | 2004-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-06 | 2008-02-05 | 2008-08-06 | $7700.00 | Window Closed / Lapsed |