# Translations:Small and white reflection coefficients/1/en

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Finally, let us consider the case in which the reflection coefficients are not only small but also are white. In such a case, the autocorrelation coefficients are each approximately zero. As a result, the denominator polynomial reduces to 1, and thus . This equation says that in effect, the multiples cancel each other out. Thus, when the reflection coefficients are small and white, the trace becomes , which is the multiple-free trace given by equation 3, the synthetic seismogram (without multiples). In other words, in the case of small and white reflection coefficients, the dynamic convolutional model (equation 1) reduces to the time-honored synthetic seismogram (without multiples), which is by far the most used type of synthetic.