在 DDMF 全部的等化器裡,GrandEQ 是 DSP 演算法最複雜的一顆。數位 EQ 設計的目標永遠是減少取樣頻率有限所帶來的數位失真,而最後那幾個百分點的優化最難做。GrandEQ 的最小相位模式在振幅與相位兩個層面都做到了大多數 EQ 做不到的程度,同時只引入極少的延遲;原廠拿一個 10 kHz、+9 dB 的 Bell 濾波器做比較,GrandEQ 的振幅曲線貼著真實類比響應到 20 kHz 以下幾乎看不出差別,相位曲線也一路跟到 20 kHz 以上,而一般數位 EQ 與 decramped 數位 EQ 在高頻都明顯偏離。
線性相位模式則完全留在時域,用正向/逆向處理演算法加上 2 倍超取樣,換來平坦相位與最低程度的數位失真。結果是開闊、清晰的聲音,CPU 效率依然出色。兩種介面樣式可一鍵切換,第二種極簡風格讓你把注意力放回聲音本身。
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