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When you push the Sync Source button, you may select any of four
possible sync options. If a clock source is valid, a sample rate will appear
next to that selection. For instance, if a clock source is connected to the
Hilo Digital input, next to “Digital in” there would appear the sample rate
that the clock source is generating.
The available sources are:
Internal: Clock driven by the Hilo’s crystal oscillator.
Word Clock: Clock derived from the WORD CLOCK input.
Digital: Clock derived from the active digital input.
ADAT In: Clock derived from the ADAT input.
With a Hilo-Dante, Dante would also appear as a possible sync
source. In a Dante system, it would be typical to set each device to
slave to Dante and use the Dante Controller Software to manage
clock sources
If a new clock source is selected, the rate generated by the selected device will become the current clock rate for Hilo. Only valid and
active clock sources can be selected. All others are grayed out, and not selectable. With a USB Hilo, the USB cable must be removed
from the back of the Hilo, before a new Sync source can be selected.
5.3.1.1.3 SynchroLock
Lynx’s SynchroLock™ technology is a very effective form of jitter reduction for digital signals.
Jitter is a type of clock error that may potentially result in distortion in an audio signal.
SynchroLock reduces jitter by a factor of 3000:1 by using the Hilo’s high resolution crystal
oscillator to generate a clock signal that is phase locked to the external clock.
Compare this to attenuation of 100:1 or less for professional quality analog phase-lock loops (PLL) that are used by most Pro Audio
devices. As long as the clock frequencies are within +/- 100ppm of Hilo’s supported sample rates, SynchroLock will operate on the
clock signal, and insure a low-jitter clock drives the Hilo and is also sent to devices downstream (i.e. clock slaves to the Hilo).
The SynchroLock operation is a two-stage process, starting with a fast-locking analog PLL to insure that there is clock sync
immediately when a Sync Source or Sample Rate are selected, and concluding with the digitally controlled crystal-based secondary
stage. It is normal for SynchroLock to take 1-2 minutes to achieve full lock.
There are four possible states for the SynchroLock button.
Locked
Either Hilo is operating off of its Internal clock, or SynchroLock has achieved full
lock to the specified external clock source. In this state, playback and recording of
audio is possible.
Working
Hilo is operating off of its Analog Phase Lock Loop to lock to the incoming clock
signal, while the SynchroLock circuitry is performing analysis on the incoming clock
signal. This may continue for 1-2 minutes. In this state, recording of audio is
discouraged. Playback is acceptable, but it should be noted that there will be an
audible click the moment that full lock is achieved. “Working” will occur every time
a new Sync Source or Sample Rate is selected unless SynchroLock has been disabled
or the Sync Source is set to Internal.
Range
This indicates that the selected external clock signal is operating outside of
SynchroLock’s usable range. If this state is persistent, it is advisable to stop using the
clock source responsible.
Off
The SynchroLock circuitry has been disabled by the user. In this state, the Hilo will
only clock via the Analog PLL when external Sync Sources are chosen. Pressing the
SynchroLock button will toggle between On and Off. Generally, disabling
SynchroLock is not recommended for the best analog performance.
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