was designed to get the most out the PC sound. It eliminates the jitter and re-clocks the signal.

It isolates your audio gear from the noisy PC environment.

At the heart of the Hydra, you can find the Spartan6 FPGA which also supports raw dsd audio streams.

Hydra uses 2 low noises clocks for signal regeneration : CCHD-957 type from Crystek, one of 45.1584 Mhz and one of 49.152 Mhz:

You can check real graphs of these ultra-low phase noise clocks here. The clocks are system masters. In order to remove any jitter induced by the FPGA circuit itself, special retiming is applied just before the Hydra outputs.

The usb transactions are processed at high speed with the help of an ARM processor.

One other thing I like about it, is the fact that it runs on battery, giving it clean power. This battery gives you ~9h of music play time, which is not bad at all.

You should look here for full specifications.

ไม่ได้ค่าโฆษณาครับ ไม่รู้จักกับเจ้าของชาวโรมาเนียเลย แต่เขาเขียนสรุปไว้คร่าว ๆใน headmania
The hydra cleans up the sound making it clean like a whistle. This implies a lot :

■the sound flows smoothly
■the dynamics are improved a lot
■the bass has more impact, presence and is more detailed
■a lot more details
■the sounds open up and not by a little
■better instrument separation, better imaging and positioning
■deeper and punchier bass

ข้อมูลเพิ่มเติมในเว็บของเขาครับ
http://www.audiobyte.ro/hydra.html
The ultra high-speed usb interface,
capable of very high audio sample rates. The Hydra is equipped with a modern ARM processor for resolving usb transactions.

The isolation
between noisy PC environment and the audio chain. The USB isolation for audio devices is nothing but tricky. If you choose to use usb isolators, then sample rate will become limited, which is not an option. If you choose to isolate the output, you are adding significant amounts of jitter to the signal. By using a clever circuit topology, the Hydra design avoids these two bottlenecks. The isolation is placed between the ARM processor and the FPGA audio core, therefore not limiting the bandwidth. Being before the clocks, it's jitter contribution becomes irrelevant. See the Hydra-X technical paper for more details.

The Spartan6 FPGA
is the heart of the Hydra. This advanced programmable circuit is offering a bit-transparent processing and signal conditioning to S/PDIF, AES/EBU, Toslink and I2S outputs. It also gives the ability of the Hydra to output raw dsd audio streams.

The clocks
unlike other products which only specify "low jitter clocks", we are saying the exact type of what we're using: it's the CCHD-950/957 type from Crystek, one of 45.1584 Mhz and one of 49.152 Mhz. You can check real graphs of these ultra-low phase noise clocks here. The clocks are system masters. In order to remove any jitter induced by the FPGA circuit itself, special retiming is applied just before the Hydra outputs.

The battery
a low impedance, LiPo-nano technology, provide to the system the cleanest power supply needed for pristine audio performance. All sensitive circuitry like the clocks, FPGA and retiming circuitry benefit from battery power. The USB port and external (optional) are alternative options for powering the system, but everything was primarily designed to work with clean battery power.

Careful pcb layout

มีอีกตัวหนึ่งที่น่าสนใจคือ Audiobyte Silver Dragon ตัวเดียวจบจริงหรือเปล่าสำหรับ
คนที่เล่นเพลงผ่านคอมพิวเตอร์
(The friendly) SILVER DRAGON - Integrated dac / headphone amplifier with asynchronous usb link and dsd capability

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