The SAA4945H, LIMERIC (LIne MEmory noise Reduction IC) is a 2-D recursive noise reduction filter for both luminance and colour difference signals. The noise reduction is automatically adapted to the global noise level in the image. Ten different preferences of noise reduction can be set using a synchronous receiver transmitter bus; SNERT (Synchronous No parity Eight bit Receive Transmit) bus. Alternatively, the noise reduction can be switched off. The LIMERIC is generally placed directly after the ADC in the video chain.