5.1 Dolby DSR1090 digital signal processing requirements
We recommend specific digital signal processing parameters for the DSR1090.
Table 2: DSR1090 general filtration, gain, and delay requirements
Highpass filter
Lowpass filter
Polarity
Delay
50 Hz, 24 dB (fourth- order
Butterworth)
None
Positive
None
Table 3: DSR1090 parametric equalization requirements
EQ frequency
Constant Q
Constant
bandwidth
EQ gain
65 Hz
2.87 Q
0.5 bandwidth
0.66
+2 dB
2 kHz
4 Q
0.36 bandwidth
0.5
-3 dB
13.5 kHz
4 Q
0.36 bandwidth
0.53
-4 dB
5.3 kHz*
1.41 Q
1.0 bandwidth
1.44
-4 dB
*Optional for x-curve shaping
Note: There are two principal implementations for parametric EQ filters in DSP processors. You need
to select either the Constant Q or Constant Bandwidth (BW) mode in your DSP user interface (UI). The
DSP UI may provide both Q and BW settings, or it may show only BW, with no option to input or show
Q. To correctly match the intended performance of this Dolby product, confirm with your DSP
manufacturer as to which implementation is used. The Dolby CP850 and Dolby CP950 cinema
processors use constant-bandwidth parametric EQ filters.
Table 4: DSR1090 limiter requirements
RMS limiting
Attack time
Release time
Peak stop
40 V
rms
16 ms
256 ms
142 Vpk
Dolby DSR1090 digital signal processing requirements
Dolby DSR1090 Owner's Manual
25
Issue 1 Part number: 8800304
16 October 2022
