Statistical analysis of discrete signals

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phani 2011-12-26

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hi everyone,

            i am working on a project where i have to acquire signals from the sensors and do some statistical analysis. i want to know how can we find the amplitude distribution of a discrete signal.

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Walter Roberson 2011-12-26

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Sounds like a job for hist() against the original (amplitude) signal.

walter, thanks for your information. i am trying to know the amplitude distribution of the sensor signal. the sensor will converts the change in the physical parameters to volts signal. i want to find the amplitude distribution of that volts signal.

Walter Roberson 2011-12-27

The A/D convertor will compare the voltage to a pre-selected voltage range (adjustable in some convertors, fixed in others) and will scale the results to an integer value, usually 8 or 10 or 12 bits. It is those integer values that are what your program receives, and those values are proportional to the voltage (but possibly have been shifted so that negative and positive voltages could both be represented.) Do you need to calculate back to the voltages, or is it sufficient to work with the scaled (and possibly shifted) proportional values?

If you can work with the scaled and shifted values (which will very likely be the case), then you can use hist() or histc() on the input values.

Have you read the documentation for hist() and histc() ?

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