发明名称 |
Frequency dependent gamma correction circuit - uses double superimposition to provide wide frequency range correction for TV signals |
摘要 |
<p>The gamma correction circuit is for TV signals, using a mixture of corrected and uncorrected signals to obtain the desired quality, and operative over a wide frequency range without the need for transit time correction in the LF region. The signal at the input (Vi) is connected to a gamma corrector circuit (2) and thence to the non-inverting input of a differential amplifier (3) operating as a superposition circuit, the inverting input being connected to the input (Vi) directly. The superimposed signals are passed to a low pass filter (4) and one input of a superposition circuit (5) for superimposition on the original input signal (Vi).</p> |
申请公布号 |
NL7614513(A) |
申请公布日期 |
1978.07.03 |
申请号 |
NL19760014513 |
申请日期 |
1976.12.29 |
申请人 |
N.V. PHILIPS' GLOEILAMPENFABRIEKEN TE EINDHOVEN. |
发明人 |
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分类号 |
H04N5/202;(IPC1-7):04N5/20 |
主分类号 |
H04N5/202 |
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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