| 摘要 |
A television receiver having a microprocessor controlled disturbance control system that can operate totally under user control or automatically. The microprocessor generates an on-screen menu which presents noise control options to the user. In the preferred embodiment, the menu options allow the user to ameliorate the effects of impulse noise disturbances, longer duration disturbances, continuous wave form (CW) disturbances, or some combination of the three, without requiring the user to understand the nature of these disturbances. The present invention also provides compensation circuitry for reducing the effects of impulse noise in the video signal that is controlled by responding to the high frequency luminance signal produced by a comb filter, and also responding to the composite video picture signal. High frequency luminance and amplitude variations that are outside of the composite video signal range are indicative of the presence of impulse noise. These variations are detected and used to produce a control signal for activating tracking and hold circuitry for reducing the effect of the impulse.
|
