Creative 1212M, 1820M AudioDock Front Panel Indicators, Midi Input Indicators, Clock Source LEDs

3 - PCI Card & Interfaces

The AudioDock

The AudioDock Front Panel Indicators

MIDI

1

2

CLOCK

LCK 44.1 96

EXT 48 192

SMPTE

IN

OUT

The MIDI Input Indicators

These two indicators, labelled 1 & 2, show MIDI activity on the MIDI input jacks.

The Clock Source and Sample Rate Indicators

These LED indicators on the front panel of the AudioDock show the current timing synchronization and sample rate. These indicators reflect the current settings in the Session Settings Window. See System Settings.

•If the sample rate is 88.2 kHz, the 44.1k and 96k LEDs both illuminate. If the sample rate is 176.4 kHz, the 48k and 192k LEDs both illuminate.

The Clock Source LEDs

The Clock Source LEDs indicate the source of the master clock that is currently driving the E-MU 1010.

LED	Clock Source
LCK	Lock - Indicates that the internal or external clock is locked and valid.
EXT	External - Indicates that an external clock source is selected.

When the system is running from an external or digital clock source, the AudioDock continually checks that the incoming clock source is valid. If the clock source changes or becomes invalid in any way, the LCK LED will flicker or will not be lit. If sync has been lost, the audio outputs will also be muted. The AudioDock will switch to internal clock at 48kHz if sync is lost and switch back to external clock if sync is re-established.

Typical causes of loss of digital or external sync include:

•Removing the S/PDIF or external clock cables

•Loss of power to the device providing the clock source

•Sudden changes in the S/PDIF sample rate

(as would happen if a DAT tape had data recorded at multiple rates)

The Sample Rate Indicators

The Sample Rate LEDs indicate the current sample rate at which the system is running. The LEDs will light solidly to indicate the different sample rates of 44.1kHz, 48kHz, 96kHz or 192kHz.

When slaving to an external master source, the clock may drift slightly or change dramatically (i.e. abrupt sample rate change or unplugging of physical master source). the E-MU 1010 is tolerant to minor drifting within the supported rates of 44.1k, 48k, 88k, 96k, 176k and 192k, but if the sample rate drifts out of range (1%) the “Lock” LED will be extinguished. If set to external clock and the external clock is removed or out of tolerance, the E-MU 1010 will switch to internal clock at 48kHz (the default sample rate) until an external clock source is connected.

E-MU Digital Audio System 21