发明名称 |
Preamplifier for multimedia display |
摘要 |
An RGB preamplifier for a video display includes respective multipliers independently operable for adjusting the contrast of input primary and secondary video signals. The contrast adjusted video signals are added to form a combined display signal, the combined signal being applied to the first inputs of primary and secondary comparators each of which is also supplied with a respective reference DC level. The primary and secondary video signals are alternately nulled at horizontal line rate by nulling the corresponding multipliers. The primary comparator samples the combined signal when the secondary signal is nulled for clamping the DC level of the primary signal in relation to the primary reference DC level and the secondary comparator samples the combined signal when the primary signal is nulled for clamping the DC level of the secondary signal in relation to the secondary reference DC level.
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申请公布号 |
US5361101(A) |
申请公布日期 |
1994.11.01 |
申请号 |
US19930155983 |
申请日期 |
1993.11.19 |
申请人 |
ZENITH ELECTRONICS CORPORATION |
发明人 |
RABII, KHOSRO M. |
分类号 |
H04N5/265;H04N9/64;H04N9/76;(IPC1-7):H04N9/76;H04N9/74;H04N5/57 |
主分类号 |
H04N5/265 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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