decibel to linear scale conversion matlab

#Decibel to linear scale conversion matlab code#
#Decibel to linear scale conversion matlab trial#

As I have seen on some Websites while doing some Research (e.g. some kind of spectral analysis? As I said in my post, I do know some acoustic engineers who have written codes in Matlab for 1/3 octave band filters which they use for such spectral analysis (if that is what it is called). If I understand what you have shown, the Sound Levels of the transfer function in each 1/3 Octave band have to be summed up (or averaged?) to the maximum frequency based on the definition of the 1/3 Octave band filter? i.e. So that's the right direction Thanks for also highlighting the octave band regions. First of all, the plot of the transfer function in dB vs frequency (log 10 scale), which you have posted is similar to the kind of plots that I am trying to analyze. Thanks very much for your quick response. Thanks very much and looking forward to your feedback. Assuming that all of this possible in Mathcad at all.

#Decibel to linear scale conversion matlab trial#

PS: If someone is kind enough to help, the person can basically use any set of data for the transmission loss and the frequency, But if that is not possible, I could provide some trial values which could be used for the help. I will therefore be grateful if some Mathcad Prime expert can help me achieve the desired plot in Mathcad Prime 4.0, if it is possible to be achieved at all.

#Decibel to linear scale conversion matlab code#

I do however know that it is possible to get the plots I need using some kind of Matlab code and acoustic engineers are fond of using Matlab for this 'Octave band analysis'. I will love to do this in Mathcad Prime 4.0 but have no idea how and where to start or if this is at all possible in Mathcad Prime 4.0. I may not know exactly what the 1/3 Octave band is all about but I know that I am required to present my results of, for example transmission loss (in dB) vs frequency (Hz and log scale) on a plot that is transmission loss (in dB) vs frequency (in 1/3 Octave band scale). My limited understanding of the 1/3 Octave Band is that it has to do with some kind of summing or averaging of the frequencies depending on the outcome that is needed and the results present that need to be analyzed. Acoustic engineers generally however want the frequencies to be represented in a 1/3 Octave Band. However, any one who has the slightest idea in sound analysis or machine acoustics, knows that my above representation could be characterized as a so called narrow band (Please correct me if I am wrong with this denotation but that is what I have gathered, speaking to some experts). So far, I get good curves which correspond to my expectation, when I use the mentioned methodology. I now make a plot of the transmission loss vs the frequency in excel, the frequency axis (horizontal) being logarithmic and the transmission loss on the vertical axis. That means that I have 501 result points for the frequency and the determined values of the transmission loss (in dB). So let us say I performed my harmonic analysis for a frequency range from 0Hz to 500 Hz at intervals of 1Hz.

However, the x-axis, which is the frequency is a linear distribution of the frequencies which corresponds to the frequencies as derived from the harmonic analysis.

I can then make plots of for example transmission loss (in dB) versus frequency (Hz). With the aid of harmonic analyses, I can determine the sound transfer function (in dB) and the so called transmission loss (also in dB) of the these structures. I now find myself in a situation where I have to determine the structure-borne sound/sound transmission characteristics of rubber structures. I am however an expert in structural analysis. So please answer my question keeping in mind that fact. I have to preface my question by saying that I am a newbie in the whole field of acoustics.