The plot of the frequencies that build soundscapes (power spectrum) has been used to show some of their distinctive characteristics. The application of a discretized sample space is proposed to describe, in a concise manner, the contribution of different frequency signals in a soundscape on a yearly scale. A sample space composed of frequency and intensity combinations was used to describe the shapes of power spectrums and their recurrence. The number of elements of the sample space was set so that each element had a low probability of being found in random samples. In this way, the statistical confidence in the occurrence and recurrence of the elements is increased, making it possible to validate traits in the soundscape. According to their occurrence, it was established that there are “base”, “temporary” and “sporadic” combinations of frequency-intensity. When the relative frequencies of the frequency-intensity combinations were plotted versus the number of analyzed power spectrums, it was observed that few combinations predominate in the soundscape. Further, the distribution of the relative frequencies of the combinations tends to stabilize with time; a potential function described the relative frequency of the combinations. It was found that a logarithmic accumulation curve described the relationship between the analyzed power spectrums and the detected combinations in each of the proposed frequency sections; such a function was useful to validate the sampling method.

构成声景的频率图（功率谱）已用于显示其某些独特特征。提出了离散样本空间的应用，以简明的方式描述声频景观中不同频率信号的年度贡献。由频率和强度组合组成的样本空间用于描述功率谱的形状及其重复出现。设置样本空间的元素数量，以使每个元素在随机样本中被发现的可能性都很小。以这种方式，增加了元素发生和重复发生的统计置信度，从而可以验证音景中的特征。根据它们的出现，确定存在“基础”，“临时”和“零星”频率强度的组合。当绘制频率-强度组合的相对频率与所分析功率谱的数量的关系图时，可以发现在声景中几乎没有组合占主导。此外，组合的相对频率的分布趋于随时间稳定。势函数描述了组合的相对频率。发现对数累积曲线描述了每个提议频率段中分析的功率谱与检测到的组合之间的关系；这样的功能对于验证采样方法很有用。