计算RMS的时候，为什么要乘以2

[happyfsyy]

trafficstars

private fun calRMS(left: Float) {
    if (sampleCount == perSamplePoints) {
        val rms = sqrt(sampleSum / perSamplePoints) * 2 // 0~1
        sampleData.add(rms.toFloat())
        sampleCount = 0
        sampleSum = 0.0
    }

    sampleCount++
    sampleSum += left.toDouble().pow(2.0)
}

第二行，rms=sqrt(sampleSum/perSamplePoints)*2，为什么要乘以2 ？

[stefanJi]

额,具体原因很久忘记了,可能就是为了放大下数据？