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Furthermore, to facilitate the identification of the peaks in HVSR profiles for the assessment of the predominant frequency of station sites, the toolbox can also process the results of HVSR analysis to detect and rank HVSR peaks. Computations take advantage of the available power spectral density estimates of ambient noise for the seismic stations, and they can be used to estimate the predominant frequency of the many three‐component seismic stations available from the IRIS DMC. The options range from the simple average of spectral ratios to the ratio of spectral averages. These tools offer a variety of ways to compute the spectral ratio by providing different averaging routines. In this article, we introduce the Incorporated Research Institutions for Seismology (IRIS) Data Management Center’s (DMC’s) openly available HVSR station toolbox.
![spectral dmc 6 spectral dmc 6](https://hifi-inside.com/images/phocagallery/hifi-ht/spectral/preamplifier/thumbs/phoca_thumb_l_dmc-12p-1b-spectral.jpg)
smaller sensitivity to quantization noise) that make them superior to direct quantization of LPCs. Line spectral pairs ( LSP) or line spectral frequencies ( LSF) are used to represent linear prediction coefficients (LPC) for transmission over a channel.