Accurate software VST, etc, to measure low audio frequencies?

[Mbira]

Hi guys,
I'm trying to get accurate measurements of low frequencies of some of my instruments.  Waves Analyzer and Voxengo are crapping out below 60hz.  These frequencies are the bottom few notes of a piano(ish) 25-40Hz.  I'm hoping to get accurate Note and cent info for a tuning table I'm trying to create.

Anyone know anything that would work (other than just creating a specific pitched sine wave and testing the difference with my ear?

 

[Mbira]

I was wrong!  The lowest note is around 60Hz.  I got thrown off by the C3 and C4 midi note naming conventions that various DAW people don't seem to agree on....

 

[pucho812]

Are you on a MAC or a PC. Maybe fuzz measure can do what you need? It's mainly for doing room acoustics but you never know...

http://supermegaultragroovy.com/products/fuzzmeasure/

 

[john12ax7]

Could you use a tuner plugin?

 

[12afael]

most tuners have problems with really low notes.

maybe is more easy to read period than frequency. that would work if you don't need a real time measurement, you could record something at a high sampling rate and 24bit to have a good presicion. 

I wrote a pitch detection algorithm for my tesis work many years ago, correlation  would clean the signal to get a good measurement, I did use some spline interpolation to get more precision it worked very well for human voice.
you could try to use a pitch doubler or a full wave rectifier to double the pitch for a better measurement on a "normal" tunner.

if I remember correctly from my tesis work human ear is less sensitive to pitch changes at low frequences provably because human ear can`t hear too well at low frequencies.

 

[JohnRoberts]

I may be able to help... my drum tuner goes down below 20 hz...

JR