A high-oversampled, low-bit modulator typical of modern audio ADCs needs a downsampler to provide PCM audio at sampling rates ranging from 44.1 kHz to 768 kHz. Traditionally, a multistage downsampler requantises at each stage, raising questions about audio transparency.
We present a decimator design in which there is no requantisation other than a single dithered quantisation when necessary to produce a final audio output of finite precision such as 24 bits. All processing is minimum-phase and concordant with the principles introduced in [1] which optimize for a specific compact impulse response and minimal (zero) modulation noise. [2]
(See document for exact affiliation information.)
https://aes2.org/publications/elibrary-page/?id=22725
(639KB)
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member Join the AES. If you need to check your member status, login to the Member Portal.
