![]() With jitter of only 0.6 ps and noise of only 50 uV the DigiOne is justifiably a little bit proud. ![]() This is very effective for combating the jitter and noise in the digital signal. If you take your sound quality seriously, then you won't use the digital stream available via the HDMI connector, and you certainly won't use the analogue output on the Pi itself! No, you will instead use the I²S output from the RPi that is available at the GPIO header, then isolate that from all the other electrical signals, generate a new clock signal and combine this with the digital audio signal, according to Allo. ![]() Why would you want to do that? Well, the DigiOne is intended, together with the Raspberry Pi, to function as a high-end transport – a device that transfers audio data from the storage medium (USB-stick, hard disk, NAS, internet stream, etc.) to the DAC. For the cost of 3 Raspberry Pis you will get from Allo, the DigiOne, a HAT (Hardware Attached on Top) for the Raspberry Pi, which makes available a digital S/P-DIF signal from the audio signal playing on the Pi.
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