MATLAB: Convert linear to DB

converstion needed to plot radargram?

My question is should I Convert a linear value to DB (POWER RATIO) in order to plot radargrams with that values?

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http://www.mathworks.com/help/signal/ref/mag2db.html

http://www.mathworks.com/help/signal/ref/db.html

http://www.mathworks.com/help/signal/ref/pow2db.html

"The relationship between power and decibels is ydb = 10 * log10(y)"

Related Solutions

MATLAB: Can the amplitude be plotted in dB

Try this:

semilogx(Fv, 20*log10(abs(FT_af(Iv,2))*2)), xlabel('Frequency, Hz'),ylabel('magnitude');

That will convert the amplitudes to dB. The y-axis will reflect those changes, however the tick marks will not be in integer powers-of-10 such as with your x-axis and the semilogx call. You will have to format the y-axis ticks yourself.

MATLAB: Does the DB function not return the proper power ratio in Signal Processing Toolbox

This bug has been fixed in Release 2007a (R2007a). For previous product releases, read below for any possible workarounds:

Generally for engineers of communications and electronics background, "dB" unit represents a ratio, for example, between input and output. On the other hand "dBm" unit represents a magnitude of power. However, in this case "dB" is used as a magnitude of power.

You can use the following syntax of the DB function as a workaround. If X is the value in question, use:

db(X,'power')

To get the 10*log10(X) instead of the 20*log10(X).

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Related Solutions

MATLAB: Can the amplitude be plotted in dB

MATLAB: Does the DB function not return the proper power ratio in Signal Processing Toolbox

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