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User manual for MERUS™ audio amplifier configurator
MA2304DNS/MA2304PNS
DSP audio blocks
5.3.3
Multi-band DRC details
Similar to a limiter, a DRC functions based on a static input to output relationship and time domain parameters.
In the case of a multi-band DRC, each DRC operates on its own frequency band, giving the flexibility to
compress a frequency range independently of the others.
The input-to-output relationship of a DRC differs to a limiter in that a compression ratio between 1:1 and inf:1 is
possible. This enables subtler compression as the signal level increases.
The graph in
Figure 60
is an input/output plot showing several compression ratios. As an example, a 50 percent
compression (2:1 ratio) shows a 10 dB output level increase per 20 dB of input signal, above the threshold.
0
-20
-40
-40
Figure 60
DRC input/output curve with threshold = -20 dB and several compression ratios
In time domain, this DRC implementation behaves similarly to that of the peak limiter, as explained in Section
5.2.2. However, the static input/output relationship will be different, as explained earlier.
User Manual
-20
Input level (dB)
48
0% = 1:1
25% = 1.5:1
50% = 2:1
75% = 4:1
100% = inf:1
0
2022-09-12
V 1.1
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