Har, på prov, introducerat en Cambridge audio DACMagic i signalvägen till förmån för den inbyggda i min Onkyo-receiver.
Om DACens filter går att läsa:
"... adds the flexibility of three filter types: 'linear phase', 'minimum phase' and 'steep'. The differences between these filters are in some ways subtle, but may be significant in determining the DAC's sound.
Linear phase is the type of filter most commonly used in up/oversampling players, since the very first Philips' machines in the early 1980s. It gives no phase shift at all within the audio band and rolls off very sharply around half the sampling frequency.
As most commonly implemented, it has rather limited attenuation at exactly half the sampling frequency and, as a result, allows a little bit of aliasing distortion to occur if there is any audio above 20kHz. There is also pre-ringing on transients, though this has never been shown to be a real problem.
Minimum phase filters do without the pre-ringing, but do have some phase shift in the audio band. The actual frequency response is, to all intents and purposes, identical to that of the linear phase filter. The 'steep' option, meanwhile, is another linear phase filter, but with faster roll-off above 20kHz so that, effectively, no aliasing occurs.
There is slightly more pre-ringing than with the linear phase filter. This needs a little more processing power than the other filter types, but it should theoretically be the best of the lot – except that this one adds a small, but not vanishing amount of passband ripple, something of poorly understood subjective significance."
Rena grekiskan för mig. Vad betyder det?
