Avant de mettre en place des solutions, certes ingénieuses, efficaces et pas cher, vérifiez donc si elles ne sont pas redondantes avec celles deja mises en place par les fabriquants. Ainsi, sur le NDS, non pas un mais deux ponts optiques séparent la musiques des interférences electriques. Et cela aux stades ultimes du traitement afin qu'aucune autre pollution ne gêne le signal.
Voici ce que Naim dit (en page 3) dans un
White paper lors de la présentation du NDS:
"Dataflow
When the NDS requests a music file, the UPnP™ server concerned will packetize the file into a TCP (Transmission Control Protocol) stream for transport across the network. The NDS accepts this TCP stream,unpacks it and buffers the data in memory. Thisbuffering, which takes place within the Streamer module,takes up the inevitable variations in network latency which could otherwise cause audible clicks and pops or even drop-outs. The data from the streamer Module is clocked out to the DSP as a digital audio stream, using differential transmission to reduce radiated electrical noise from this fast digital signal. This differential digital stream is then galvanically isolated from the DSP section using a high-speed pulse transformer. The full internal functions of the DSP are explained later in this document. Buffered I2S data output from the DSP is
opto-isolated and reclocked through a reclocking gate before the DAC section, where it is converted to an analogue signal. The analogue signal is then filtered to remove the out-of-band artefacts that are a by-product of the digital to analogue conversion process.
il y figure le schéma suivant avec 2 ponts optiques separant l'informatique, le traitement du signal et le reclockage...pas mauvais les gars de naim dès 2012...
