2007/3/6, Peter Worth <peterworth2@googlemail.com>:

i kind of hoped that tabread4 would do some kind of interpolation
which might magically stop aliasing..

As Frank mentioned, it does, but "interpolation" in itself is a heavily overloaded word. Consider linear interpolation: it is, it is done, but during upsampling, sine wave at Nyquist transforms into triangular and sub-Nyquist sines are high-freq distorted, too... :( Interpolation is the field, where the question of "how" is, IMO, of even greater importance than that of "if".