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Non-linear signal processor

A nonlinear and processor technology, applied in the field of signal processing systems that process signals nonlinearly, can solve problems such as power supply voltage difference and ground potential difference

Inactive Publication Date: 2003-03-12
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] A common problem with video signal processing systems is the pickup of "noisy" signals due to: (1) stray electrostatic and / or electromagnetic fields, (2) ground potential differences between different stages of the system, and (3) different stages of the system The supply voltage difference between

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Embodiment Construction

[0020] The present invention is described below in the context of an exemplary embodiment comprising a television signal processing system. However, the invention can be applied to other types of signal processing systems.

[0021] A signal processing system such as a television signal processing system typically includes means for amplifying a voltage signal, for example, either a demodulated luminance signal or a component color signal. It is often desirable to provide the amplifier with non-linear gain characteristics. Such as figure 1 As shown, this is often the case, ie, using a differential amplifier 10 where one input 12 to the amplifier 10 contains the desired time-varying signal and the other input 14 provides a common mode bias for the amplifier 10 . It is also common for time-varying common mode components to be present on each of the two input signals. exist figure 1 A common mode bias 14 is applied to the base of transistor 16 in the circuit of , and a time-va...

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Abstract

A signal processor which provides non-linear transfer functions provides a processor output and non-linear inflection points that are referenced to a common bias. The processor output and the non-linear inflection points each exhibit rejection to time variant common-mode variations.

Description

technical field [0001] The present invention relates generally to signal processing systems that process signals non-linearly, and more particularly to systems that process signals non-linearly in partial differential architectures. Background technique [0002] It is often desirable in signal processing systems to provide non-linear transformation functions to amplify portions of a signal's dynamic range with different amplification amounts. Such non-linear processing is often required for one or more reasons. For example, in video signal processing systems, nonlinear processing can be used to: (1) enhance the subjective appeal of a displayed video image, (2) compensate for different "gamma" characteristics of the camera and display device, or (3) adapt Different nonlinear light output characteristics of various light output channels of a color video display device. [0003] A common problem with video signal processing systems is the pickup of "n...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03G7/06H04N5/20
CPCH04N5/20H03F3/45098H03G7/06H03K3/023
Inventor 达尔·F·格里彭特罗格
Owner THOMSON LICENSING SA
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