Specifications

studio practice to establish a central high quality clock source, to which all the digital

audio equipment is synchronized, usually by Word Clock.

The H8000FW family’s digital inputs AES1-4 (and AES5-8 on the H8000) incorporate

optional sample rate conversion, where new digital values are “made up” to fill in the gaps

caused by a difference in sample rates.

Using the Internal Clock

When you use the "internal" clock, the system

sampling rate will be that of the internal clock.

Unless sample rate conversion is on ("bottom"

page under

clock in the SETUP area), slipping will

occur on any digital inputs unless they are externally locked to one of the H8000's digital

outputs. The ADAT (and AES11-18 and FireWire on the H8000FW) inputs have no

sample rate conversion and thus cannot be used with an internal clock unless the external

unit is synchronized to the H8000FW's digital outputs.

 See The Status of The Digital Inputs When Using the Internal Clock on page 82.

Selecting the Internal Clock’s Rate

To select the internal clock, set the Source parameter on the clock menu page in the

SETUP area to Int 44.1 kHz, Int 48.0 kHz, Int 88.2 kHz, or Int 96.0 kHz:

44.1 kHz The rate of standard compact disks. The "44.1kHz sample rate indicator" is

illuminated. The highest reproducible audio frequency is ~20kHz.

48 kHz The "professional" or "broadcast" rate. The highest reproducible audio

frequency is ~22kHz.

88.2 kHz Twice the rate of standard compact disks. This raises the highest possible

reproducible audio frequency to ~40 kHz. The cost of these "20k +" overtones is a

reduction in the size of the programs the H8000FW can run. Some programs will be

"unloadable" when 88.2 kHz is selected. Similarly, if one of these programs is loaded, you

will not be able to select 88.2 kHz.

96 kHz The current "professional rate," commonly used in DVD production. This

raises the highest possible reproducible audio frequency to around 44kHz. Some

programs will be "unloadable" when 96 kHz is selected.

The actual value of the system sampling rate can

be read in the field that reads, "Sample Rate:

xxxxx

." This will be accurate to the nearest Hz.