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36
For all sources the 752BD up-samples all internally decoded material to
24/192kHz via an Analog Devices SHARC DSP.
This runs our proprietary code from Anagram Technologies which
performs jitter suppression, up-sampling and anti-alias ltering for all 10
analog outputs (7.1 and Dedicated Stereo).
The front panel Filter button allows cycling between three different anti-
alias lters as described below.
The three different Filter functions are: Linear Phase, Minimum Phase
and Steep. All three lters are optimised specically for audio playback.
Each offers excellent sound quality but differs subtly in optimisation,
hence we’ve made all three available to you.
Note: For clarity, all diagrams show the theoretical response of the DSP
itself, excluding any analog ltering at the DAC outputs or the anti-aliasing
lter applied during recording and/or mastering of the digital source.
Filters
The Linear Phase lter is a highly regarded audio lter offering low ripple
in both the pass and stop bands, and what is known as constant group
delay. Constant group delay means that audio signals of all frequencies
are always delayed by the same amount when passing through the lter.
All audio is therefore fully time-coherent at the output.
The trade-off with this type of lter is that due to internal feed-forward
in the DSP, its impulse response will exhibit some pre-ringing. In other
words, when excited with a theoretical impulse, the output has both
a small amount of pre- and post-spike amplitude ringing (albeit well
damped).
-80
-60
-40
-20
0
20
-200
-180
-160
-140
-120
-100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
frequency/FS (input sampling rate)
Magnitude (dB)
Linear phase lter frequency response
0 20 40 60 80 100 120 140 160 18
0
0
Linear phase impulse response
Time (samples)
Amplitude
Minimum phase lter frequency response
-80
-60
-40
-20
0
20
-200
-180
-160
-140
-120
-100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
frequency/FS (input sampling rate)
Magnitude (dB)
The Minimum Phase lter is another highly regarded audio lter that
offers even lower ripple in the pass and stop bands. Unlike the Linear
Phase lter, group delay is not constant so some time-coherence is lost;
however, phase shift is low and the particular benet with this lter is
that the impulse response exhibits no pre-ringing.
0
0 20 40 60 80 100 120 140 160 18
0
Minimum phase impulse response
Time (samples)
Amplitude
36


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