what is phono equalizer RIAA?

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lucky8

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Guyz,

I'm learning about noise and i come across the term RIAA. I'v searched thru the internet but i couldn't get the meaning of the word RIAA itself.
I also wonder why some datasheet refer the RIAA as VNI (Equivalent input noise voltage), and some use spectrum density as VNI measurement.
 

RIAA = Recording Industry Association of America
https://en.wikipedia.org/wiki/RIAA

For RIAA equalization circuit and RIAA equaliztion curve goto:
**broken link removed**

Regards,
IanP

Code: 
RIAA Equalizer frequency response 
30Hz 50 100 300 700 1KHz 2K 3K 5K 7K 10K 12K 15K 
+18.61dB +16.96 +13.11 +5.53 +1.23 0 -2.61 -4.76 -8.23 -10.85 -13.75 -15.28 -17.17
 

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    lucky8

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any idea why some used RIAA (uVrms) as reference for input noise voltage and others used spectrum density (nV/(Hz)0.5)?
 

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