Maybe somebody with a real clue wants to offer some insight on what kind of nastiness such an unorthodox approach would yield. Two networks connected in cascode will complete the RIAA curve, see picture. If, on the other hand, you are trying to do accurate reproduction, I'm sure this is going to cause some unexpected results. If you intend to use that curve as a 'special effect', then an approximation is probably sufficient. It seems you could APPROXIMATE the curve, even with something as simple as a 5-band eq(?) Or, you could just plug values into that formula and solve it for each frequency band 'f' that your EQ plugin supports. If you know of some hot EQ plugin that could do any aspect of this better than the built in Sonyc Foundry ones, you would probably improve your results by using it. When writing the original program to a varnish disc signal is processed by a predistortion circuit with time constants 3180, 318. set up the first one, then save that as parametric EQ preset 'temp', then load it in to the next one and you will only have to set the frequency, instead of doing the whole thing from scratch. The RIAA curve is the standard amplitude-frequency characteristic (AFC) of the recorders of a long-playing gramophone record and the inverse of its amplitude-frequency characteristic of the preamps-correctors, restoring the original signal spectrum during playback. Mathematically, the pre-emphasis transfer function is expressed as. 15, which we can only approximate because the bandwidth control is limited to one decimal place.)Īlso, the gain control only provides one decimal place, so here we are approximating as well.Īccuracy set to 'high', of course, unless this makes my computer crawl.Ĭreating a template preset can expedite the setup of this idea considerably. The RIAA equalization curve was intended to operate as a de facto global industry.
their phono-amp circuits without RIAA equalization The same calculation with a. could therefore be found by substituting equation (5.20) into (5.9). I'd start with an output gain of -18dB on all of them, to try to ensure adequate headroom, adjusting level downward if necessary.īand-notch/cut filter type.2 octave bandwidth, (based on the assumption that a 31-band EQ has 1/3 octave bandwidth, so a 62 would need 1/6 octave bandwidth, or. The RIAA equalization curve is a rather complex mathematical formula that. The optimum anode current is dramatically reduced since the RIAA curve enhances the. Use audio plugin chainer and string together 62 parametric EQs, each one representing one of the frequencies found in the table here:
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