M2TECH HIFACE EVO TWO, Руководство пользователя

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HIFACE EVO TWO
UNIVERSAL D-TO-D CONVERTER
REVISION P
R
A – AUGUST 2015
Copyright © 2015, M2Tech Srl
19
M2Tech
www.m2tech.biz
7. Using the
HIFACE EVO TWO
HIFACE EVO TWO HIFACE EVO TWO
HIFACE EVO TWO
7.1. Input selection
The
HIFACE Evo Two
is provided with two inputs: one is the USB port (Fig. 2, 10) and the
other is the S/PDIF input (Fig. 2, 5). They are selected using the navigation buttons on the
remote control: press the “arrow up” button to select the USB input, press the “arrow
down” button to select the S/PDIF input.
7.2. HID with the USB input
The
HIFACE Evo Two
allows the user to control the player on the computer when the USB
input is selected. The following commands are available:
•
Play/Pause (“OK” button);
•
Stop ( “OK” button, long press);
•
Previous track ( “arrow left” button);
•
Next track ( “arrow right” button).
To use the HID feature, it is necessary to use a compliant player.
7.3. Sampling frequency conversion with the S/PDIF input
The
HIFACE Evo Two
is provided with an asynchronous sampling rate converter (ASRC). It
is mandatory for the acquisition of a digital audio signal by the S/PDIF input (Fig. 2, 5), as
both the device connected to it and the
HIFACE Evo Two
are clock master, and it’s
necessary to place in between something compensating the small frequency drift of the
two devices’ clocks.
The ASRC may also be used to deliver the signal on the S/PDIF input to the
HIFACE Evo
Two
outputs with a different sampling frequency. For example: if the user owns a DAC
which is known to deliver best performance when driven by a 192kHz signal, she/he can
set the
HIFACE Evo Two
ASRC to perform the upsampling of the signal coming from a CD
player connected to the S/PDIF input (as everybody knows, the CD signal is sampled at
44.1kHz).
When the ASRC is enabled, the user can choose the output sampling frequency using the
“arrow left” and “arrow right” buttons on the remote control.
NOTE: the ASRC is only effective on signals applied to the S/PDIF input. This feature
would be useless for the USB input as the sampling rate conversion can be more easily
performed by the player or by the computer’s operating system itself.
NOTE: When the S/PDIF input is selected and the ASRC is disabled, the I
2
S is also
disabled.