audiohub.gr

DomieMic65 wrote:https://github.com/dsnyder0pc/rpi-for-roon/blob/main/Diretta.md?fbclid=IwdGRleAPmp8RleHRuA2FlbQIxMQBzcnRjBmFwcF9pZA8xNzM4NDc2NDI2NzAzNzAAAR7UHZBBVrPjddmBKeEJKEQp1e6xYvGeiMYJNp4FK0gryZfIPSsb67_OAeA18Q_aem_CnS-uAtSYdh_cbmFx2VYHw#1-prerequisites

angpsi wrote:

DomieMic65 wrote:https://github.com/dsnyder0pc/rpi-for-roon/blob/main/Diretta.md?fbclid=IwdGRleAPmp8RleHRuA2FlbQIxMQBzcnRjBmFwcF9pZA8xNzM4NDc2NDI2NzAzNzAAAR7UHZBBVrPjddmBKeEJKEQp1e6xYvGeiMYJNp4FK0gryZfIPSsb67_OAeA18Q_aem_CnS-uAtSYdh_cbmFx2VYHw#1-prerequisites

Χαλαρά ένα Σ/Κ φεύγει μέχρι να στηθεί αυτό, έχω εμπειρία με Archlinux!

The Three-Tier Architecture: Roon + Diretta

Moving Beyond "Band-Aids" to a Foundational Solution

Roon Labs itself advocates for a "two-box" architecture to solve this primary issue: separating the demanding Roon Core from a lightweight network Endpoint (also called a streaming transport). This is the correct first step, as it offloads the heavy processing to a remote machine, isolating its noise from your audio rack.

However, even in this superior two-tier design, a more subtle problem remains. Standard network protocols, including Roon's own RAAT, deliver audio data in intermittent "bursts". This forces the endpoint's CPU to constantly spike its activity to process these bursts, causing rapid fluctuations in current draw. These fluctuations generate their own low-frequency electrical noise right at the endpoint—the component closest to your DAC.

High-end audio manufacturers attempt to combat the symptoms of this bursty traffic with various "Band-Aid" solutions: massive linear power supplies to better handle the current spikes, ultra-low-power CPUs to minimize the spikes' intensity, and extra filtering stages to clean up the resulting noise. While these strategies can help, they don't address the root cause of the noise: the bursty processing itself.

This guide presents a more elegant and dramatically more effective solution. Instead of trying to clean up the noise, we will build an architecture that prevents the noise from being generated in the first place.

The Three-Tier Architecture: Roon + Diretta

This project evolves Roon's recommended two-box setup into an ultimate, three-tier system that provides multiple, compounding layers of isolation.

Tier 1: Roon Core: Your powerful Roon server runs on a dedicated machine, placed far away from your listening room. It does all the heavy lifting, and its electrical noise is kept isolated from your audio system.
Tier 2: Diretta Host: The first Raspberry Pi in our build acts as the Diretta Host. It connects to your main network, receives the audio stream from the Roon Core, and then prepares to forward it using a specialized protocol.
Tier 3: Diretta Target: The second Raspberry Pi, the Diretta Target, connects only to the Host Pi via a short Ethernet cable, creating a point-to-point, galvanically isolated link. It receives the audio from the Host and connects to your DAC or DDC via USB.

What Diretta and AudioLinux Bring to the Table

This design's superiority comes from two key software components running on the Raspberry Pi devices:

AudioLinux: This is a purpose-built, real-time operating system designed specifically for audiophile use. Unlike a general-purpose OS, it's optimized to minimize processor latencies and system "jitter," providing a stable, low-noise foundation for our endpoint.
Diretta: This groundbreaking protocol is the secret sauce that solves the root problem. It recognizes that fluctuations in the endpoint's processing load generate low-frequency electrical noise that can evade a DAC's internal filtering (as defined by its Power Supply Rejection Ratio, or PSRR) and subtly degrade its analog performance. To combat this, Diretta employs its "Host-Target" model, where the Host sends data in a continuous, synchronized stream of small, evenly spaced packets. This "averages" the processing load on the Target device, stabilizing its current draw and minimizing the generation of this pernicious electrical noise.

The combination of the physical galvanic isolation from the point-to-point Ethernet link and the processing noise elimination from the Diretta protocol creates a profoundly clean signal path to your DAC—one that can leapfrog solutions costing many thousands of dollars.
A Rewarding Path to Sonic Excellence

This project is more than just a technical exercise; it's a rewarding way to engage with the hobby and take direct control over your system's performance. By building this "Diretta Bridge," you are not just assembling components; you are implementing a state-of-the-art architecture that addresses the core challenges of digital audio head-on. You will gain a deeper understanding of what truly matters for digital playback and be rewarded with a level of clarity, detail, and musical realism from Roon that you may not have thought possible.

It recognizes that fluctuations in the endpoint's processing load generate low-frequency electrical noise that can evade a DAC's internal filtering