Old LP's and records

[Geoffrey]

In regard to this discussion it should be realised that the output from
the magnetic cartridge of a record player rises at 6 dB per octave. This
must be compensated on reproduction using (these days) standard RIAA
equalisation, nominally at -6dB per octave. Actually its a little more
complicated than that as there are three time constants in the
equalisation curve. RIAA equalisation can be achieved in a single (low
noise) op amp with a feedback network providing time constants of 3180us
(50Hz), 318us (500Hz) and 75us (2122Hz). Recording without equalisation
would produce sound with high treble and low bass, sounding 'tinny'.
Of course equalisation could be done digitally within software. However
I looked at the menu of Audacity and, although there is reference to
high and low pass filters, I could find no reference to RIAA
equalisation. Perhaps the Audacity software mentioned has RIAA
provision.
Pardon me if all this is known.
I have recorded my old vinyls to CDs uisng hardware that provides both
RIAA equalisation and circuitry to remove clicks and plops. Most of this
noise is noticeable on the first 20 mm of track where the velocity is
greatest. I've heard that there is software to do all this.  
Geoffrey