A circuit testing apparatus includes a controlling processor for controlling stimulus signals to be applied to a circuit under test and for processing and storing response signals generated by the circuit under test in response to the stimulus signals. The method can be used to convert the original YUV signal to arbitrary quantization levels in RGB space. The seat back has in its upper portion at least one strap passage intended to receive a chest strap of a safety belt of a motor vehicle. In addition, the PS3 system solves significant economic considerations.