Updated the RIAA EQ Filter software to the final version v.1.0:
- more readable information fields
- selection for subsonic filter (enable/disable)
I probably prepare a better subsonic filter someday and maybe add a selection for to link those slider moves.
By setting up Electri-Q for Chebyshev I, HP Filter 36dB/oct @ 20Hz / BW20 it's possible to get quite steep subsonic/rumble filter (lighter line on graph):
http://img138.imageshack.us/img138/403/subsonicxc9.jpg
http://img86.imageshack.us/img86/9499/eqni3.jpg
Schematic for this filter project:
http://img135.imageshack.us/img135/9...erscemazi2.jpg
As seen in picture, I have multiplied the gain coefficients by 10. This gains the filter output signal over +30dB. Harmonic distortion stays still under -100dB but, if you feel it's gained too much then, just change those three first values on each RIAA filter. By dividing values by 10 you'll get the original level (~0dB @ 1kHz (as seen in the background image of tis filter software)). Do not touch into those two last filter coefficients !!
Quote:
RIAA Filter software specs:
44.1kHz
Maximum error from 0.00 Hz to 20000.00 Hz = ~0.224dB
Maximum phase error from 0.00 Hz to 20000.00 Hz = ~+/- 30 degrees
where the "phase error" is computed after a constant delay is added or subtracted to make the phase error equiripple
48kHz
Max error from 0.00 Hz to 20000.00 Hz = ~0.14dB
Max phase error from 0.00 Hz to 20000.00 Hz = ~+/- 24 degrees
88.2kHz
Maximum error from 0.00 Hz to 20000.00 Hz = ~0.0082dB
Maximum phase error from 0.00 Hz to 20000.00 Hz = ~+/- 3 degrees
96kHz
Maximum error from 0.00 Hz to 20000.00 Hz = ~0.0057dB
Maximum phase error from 0.00 Hz to 20000.00 Hz = ~+/- 2.4 degrees
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jiitee