question: Which ratios are employed to calculate noise-based speed ?
answer: the 40:1 ( `` excellent image quality '' ) and the 10:1 ( `` acceptable image quality '' ) ratio
turker_answer: The 40:1 ( `` excellent image quality '' ) and the 10:1 ( `` acceptable image quality '' ) ratio are employed to calculate noise-based speed .
rule-based: The 40:1 ( `` excellent image quality '' ) and the 10:1 ( `` acceptable image quality '' ) ratio are employed to calculate noise-based speed .