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Impostazioni filtro
Il 651C utilizza il convertitore digitale-analogico (DAC) WM8742 di Wolfson
Microelectronics. Il 651C dispone di due DAC in modalità dual differential
(ovvero uno per canale in una modalità bilanciata internamente). Questi
componenti di altissima qualità permettono di selezionare un’ampia varietà
di filtri. Non c’è una scelta “giusta”, anzi siamo noi i primi a invitarvi a provare
i vari filtri e a scegliere quello che ritenete più adatto alle vostre orecchie. Di
seguito sono illustrate le varie caratteristiche:
Fase lineare
Questo filtro mostra uno spostamento di fase lineare (ovvero un ritardo di
gruppo costante) per cui tutti i segnali audio sono coerenti in termini di tempo,
nel dominio del tempo vi è scarso pre-ringing e post-ringing. La reiezione fuori
banda è buona.
Risposta (dB)
Risposta agli impulsi
22kHz
Fase minima
Questo filtro presenta una reiezione fuori banda simile a quella di cui sopra ma
compensa uno spostamento di fase leggermente non lineare con la frequenza
per l’assenza di pre-ringing nel dominio del tempo.
Risposta agli impulsi
Risposta (dB)
22kHz
Steep
Questo filtro mostra una forte attenuazione delle immagini anti-aliasing al di
fuori del passa banda (ovvero superiore ai 22.05kHz) a spese di uno scarso
roll-off a 20kHz e un certo pre-ringing e post-ringing nel dominio del tempo.
Risposta agli impulsi
Risposta (dB)
22kHz
10


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