www.snellgroup.com
Mach HD V2 Motion Compensated Standards Converter with Synchronizer, Up, Down, and Cross Conversion
Version 1 Issue 1
©
Snell 2009
Page 13
Data width
>= 10 bit YCbCr throughout
Audio
ADC/DAC conversion is 24 bit
Digital audio is 24 bit throughout
Delay smoothly tracks video delay
Minimum audio delay < 3ms
General
Dimensions
H44mm x W440mm x D255mm
Weight 2.25kg
Throughput delays
Frame rate
conversion
Delay ~= 58ms (motion compensated or linear)
Same frame rate
'Sync' mode
(interlaced
formats)
0.4ms < Delay < 2 0.4ms
Same frame rate
'Sync' mode
(720P)
0.4ms < Delay < 1 field + 0.4ms
Same frame rate
'ARC' mode
(interlaced format
in
and
out)
4 1ms < Delay < 6 1ms
Same frame rate
'ARC' mode
(720P in
or
out)
4 1ms < Delay < 5 1ms
where field = 16.7 or 20ms
Notes
When Mach HD is performing a standards conversion, irrespective of reference mode, the delay is always approximately 58ms
In Sync mode, the Mach HD is acting as a synchroniser only (the input and output have the same format and frame rate), and it is
assumed that the user is synchronising the output to a chosen reference. Depending on the reference, the delay will vary between 0.4
ms (minimum) and 2 fields plus 0.4 ms (maximum).
For ARC mode, there must be at minimum 4 fields of delay as the Mach HD must load at least 3 fields of data to be able to do the
aspect ratio conversion with 'still mode' processing. In input-locked mode, the ARC delay could be just 4 fields. However, if the user is
synchronizing the output to a chosen reference, as in Sync mode above, depending on the reference, and up to an additional 2
1ms (maximum) delay may be incurred. Therefore the total delay in ARC mode will vary between 4 fields (minimum) and 6 1ms
(maximum).
