Dave Plowman (Rabid NUTTER)wrote:

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Anyone know of (hopefully free) software which will give a real time
display of energy bands?

If say you fed white noise into an amp and the output to the PC, it
gives a graphic of the energy at different frequencies - a sort of
instant frequency response trace.


** That job is much better done with "pink noise" - having equal energy
per octave or part thereof results in a flat spectrum.

True. Hence my using 'say white noise' As the basic principle is the same.


** ********.

Accurate pink noise sources are not so easy to find and the reading will
take some time to average out.

Perhaps a suitable prog. would generate the required pink noise too.


** Won't solve prob #2.


OTOH, for most audio electronics items, a sine / square wave generator
plus scope is WAAYYYY better than either for response testing.

I want something which gives a quicker way of doing a simple check.


** So you don't understand square wave testing of audio ?

PLUS you have not defined your actual need making it impossible to answer you dumb Q.

FYI:

Checking that a response that should be flat IS flat is done accurately in seconds with a square wave test using a few spot frequencies.

Also, one can similarly check the operation of tone controls, graphic eqs and cut/boost switches by observing the effect on a square wave.

For items where the ideal response is not flat, a log swept, audio band sine wave plus modern DSO to store and view is gonna beat using pink noise hands down.


..... Phil