American Audio PSX - REV 1-2 Bedienungsanleitung PDF herunterladen (Seite 26)

UV22HR Processing

UV22HR is used to output audio at 16-bit or 20-bit while maintaining much of the detail of the original 24-bit

signal. When applied, the UV22HR-processed audio is fed to the main outputs.

The AUX and D/A outputs are

never processed.

UV22HR is presently disabled for 88.2/96 kHz operation as it has very limited, if not non-exis-

tent, applications.

• Use the PSX-100 in digital copy mode to apply UV22HR to a digital signal.

Optional Video Card

When installed (see Internal Settings) the A/D SYNC button will include VIDEO in the toggling cycle. The PSX-

100 will measure incoming sample rate for PAL, NTSC, or MONO and set hardware for 44.1k sample rate: press

A/D SYNC again to go to 48kHz. The card will automatically provide 88.2/96kHz when the higher sample rates

are selected. Input the video signal via the WC-IN/VID connector on the rear panel.

When A/D SYNC is set to video, you can bump up the sample rate (x1.001) by pressing and holding the MUTE

L button. Likewise, the sample rate can be bumped down (÷1.001) by pressing and holding the MUTE R but-

ton. To disable pull up/down, press the A/D SYNC button again.

• Pull up is indicated by a 75% duty cycle blinking of the video LED (ON longer that OFF).

• Pull down is indicated by a 25% duty cycle blinking of the video LED (OFF longer that ON).

Miscellaneous Features

Analog Processing

The PSX-100 A/D section includes Common Mode Reject circuitry, a DC removal circuit, and Soft Limit (when

enabled). The PSX-100 D/A section includes cross-coupled outputs which allow connection of a balanced signal

via single-ended cable.

Nonvolatile memory

The PSX-100 will remember front panel settings when powered down, and configure itself to those states at

power up (unless OUTPUT RES is held down during the power-up sequence). Some states may not be remem-

bered because the unit may have been powered down while in an error condition or some other disallowed con-

dition. This is normal and does not indicate a PSX-100 malfunction.

Check the ERROR conditions overleaf.

Self-clocking

All digital input sources are self-clocking – the PSX-100’s D/A section will automatically clock to the selected

digital input signal. So, for example, the D/A cannot clock to CRYSTAL while trying to input an AES signal. The

only exception is TDIF, which normally syncs to the WC input.

Loopback muting

Normally, Digital Copy mode mutes the digital output that corresponds to the interface being used for digital

input. This is to avoid creating a feedback loop through an external device such as a recorder. Thus, normally,

you cannot, for example, copy between ADAT and ADAT. Should you need to do this – for example, you want

to source a signal from one S/PDIF machine and copy it to two other machines simultaneously, using both

S/PDIF coax and optical, or you want to copy between two ADAT machines – you can defeat the loopback mut-

ing feature. Press & Hold the DIG COPY button. The LED flashes.

Be careful in this mode as it may be possible

to create a damaging feedback loop

. Press & Hold DIG COPY again to re-establish automatic loopback muting,

or simply exit Digital Copy mode.

Word Clock Out

Word Clock Out is derived from the main clock, which is the A/D SYNC source. Remember that when A/D SYNC

is selected to DIG IN, the main clock is slaving from the digital input source and the WC will be derived from it.

PSX-100 User’s Manual

Page 26

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