sentences:  Using interpolation processes to convert source material twice-over (in this example, PAL to NTSC to PAL) causes the artefacts previously mentioned to be exacerbated.RSC was developed as an alternative to double-conversion.Use of RSC bypasses the generation of the artefacts that would be introduced in a normal NTSC->PAL conversion, and actually reverses the early standards conversion method used to create the NTSC copies.