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US5072299A
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Sharpness up/down circuit for vcr controlled by a remote controller and control method thereof
Assignee: LG Electronics Inc
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Filing: 1990-06-26
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Granted: 1991-12-10
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Expires: 2010-06-26
Abstract
Abstract A VCR sharpness up/down circuit controlled by a remote controller for allowing a remote control of VCR sharpness properly by pressing a sharpness-up key or a sharpness-down key on the remote controller with the construction of a sharpness driving unit and a screen control unit and control method thereof by receiving sharpness up/down key signals from the remote controller, counting the number of input up/down key signals, selecting and outputting PWM signals from a PWM data storage unit according to the counted number, converting the output PWM signals through switching operations to a sharpness driving control voltage which is a certain DC voltage, and applying a driving control voltage to an integrator which emphasizes a video signal.
Inventors
- 👤 Je Moon Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:39
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/02; G11B20/08; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/765
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A sharpness up/down circuit for a video cassette tape recorder controlled by a remote controller, comprising: a remote controller for generating remote control signals such as sharpness up/down key signals; a microcomputer for counting a number of times said sharpness up/down key signals are received from said remote controller and for selecting and outputting a pulse width modulation signal according to the number of times counted; sharpness driving means for converting said pulse width modulation signal outputted from said microcomputer to a direct current voltage through switching operations and for outputting said pulse width modulation signal as a sharpness driving voltage; and screen control means for controlling sharpness of the video cassette tape recorder by varying emphasis on high frequency components of video signals according to a magnitude of said sharpness driving voltage outputted from said sharpness driving means.
Claim 2
Dependent Claim
139 words
A sharpness up/down circuit for a video cassette tape recorder controlled by a remote controller, comprising: a remote controller for generating remote control signals such as sharpness up/down key signals; a microcomputer for counting a number of times said sharpness up/down key signals are received from said remote controller and for selecting and outputting a pulse width modulation signal according to the number of times counted; sharpness driving means for converting said pulse width modulation signal outputted from said microcomputer to a direct current voltage through switching operations and for outputting said pulse width modulation signal as a sharpness driving voltage; and screen control means for controlling sharpness of the video cassette tape recorder by varying emphasis on high frequency components of video signals according to a magnitude of said sharpness driving voltage outputted from said sharpness driving means.
Claim 3
Dependent Claim
106 words
The sharpness up/down circuit as claimed in claim 1, wherein said sharpness driving means comprises: power supply means for supplying a rated direct current source drawn out from a direct current source with ripple components eliminated; pulse width modulation signal surge elimination means for eliminating surge phenomena from said pulse width modulation signal outputted from said microcomputer; switching means for controlling an output of said power supply means according to said pulse width modulation signal through said pulse width modulation signal surge elimination means; and an integrator for outputting said output of said power supply means after an integration is performed on a sharpness driving voltage.
Claim 4
Dependent Claim
101 words
The sharpness up/down circuit as claimed in claim 1, wherein said screen control means comprises: an emphasis integrator for performing a variable emphasis on high frequency components of video signals according to said sharpness driving voltage outputted from said sharpness driving means; high-pass filter for passing only high frequency signals of the output signals of said emphasis integrator therethrough; a limiter for limiting an amplitude of signals outputted from said high-pass filter; a mixer for mixing output signals of said limiter with inputted video signals; and clamp means for setting an output signal level of said mixer to a certain level.
Claim 5
Independent Claim
151 words
A method for controlling a sharpness up/down for a video cassette tape recorder by a remote controller, comprising the steps of: (a) setting a count value for an output pulse width modulation counter as a sharpness center value when power is supplied; (b) selecting an address of a pulse width modulation data storage unit according to the count value of the output pulse width modulation counter in a playback mode; (c) reading pulse width modulation data stored at the address and outputting the data to the output pulse width modulation counter; (d) increasing or decreasing the count value of the output pulse width modulation counter by one until the count value of the output pulse width modulation counter reaches a highest or lowest level when a sharpness-up or a sharpness-down key signal is inputted; and (e) selecting the pulse width modulation data and outputting the data according to the count value.
Claim 6
Independent Claim
151 words
A method for controlling a sharpness up/down for a video cassette tape recorder by a remote controller, comprising the steps of: (a) setting a count value for an output pulse width modulation counter as a sharpness center value when power is supplied; (b) selecting an address of a pulse width modulation data storage unit according to the count value of the output pulse width modulation counter in a playback mode; (c) reading pulse width modulation data stored at the address and outputting the data to the output pulse width modulation counter; (d) increasing or decreasing the count value of the output pulse width modulation counter by one until the count value of the output pulse width modulation counter reaches a highest or lowest level when a sharpness-up or a sharpness-down key signal is inputted; and (e) selecting the pulse width modulation data and outputting the data according to the count value.
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) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |