CS47L35 datasheet(53/300 Pages) CIRRUS

53 / 300 page

DS1085F3

CS47L35

4.3 Digital Core

Figure 4-18. DRC Response Characteristic

The slope of the DRC response is determined by DRCn_HI_COMP and DRCn_LO_COMP. A slope of 1 indicates constant

gain in this region. A slope less than 1 represents compression (i.e., a change in input amplitude produces only a smaller

change in output amplitude). A slope of 0 indicates that the target output amplitude is the same across a range of input

amplitudes; this is infinite compression.

When the noise gate is enabled, the DRC response in this region is determined by DRCn_NG_EXP. A slope of 1 indicates

constant gain in this region. A slope greater than 1 represents expansion (i.e., a change in input amplitude produces a

larger change in output amplitude).

When the DRCn_KNEE2_OP knee is enabled (Knee 2 in Fig. 4-18), this introduces the vertical line in the response pattern

shown, resulting in infinitely steep attenuation at this point in the response.

The DRC parameters are listed in Table 4-12.

The noise gate is enabled by setting DRCn_NG_ENA. When the noise gate is not enabled, Parameters 5–7 (see

Table 4-12) are ignored, and the DRCn_LO_COMP slope applies to all input signal levels below Knee 1.

The DRCn_KNEE2_OP knee is enabled by setting DRCn_KNEE2_OP_ENA. If this bit is not set, Parameter 7 is ignored

and the Knee 2 position always coincides with the low end of the DRCn_LO_COMP region.

The Knee 1 point in Fig. 4-18 is determined by DRCn_KNEE_IP and DRCn_KNEE_OP.

Table 4-12. DRC Response Parameters

Parameters

Parameter

Description

DRCn_KNEE_IP

Input level at Knee 1 (dB)

DRCn_KNEE_OP

Output level at Knee 2 (dB)

DRCn_HI_COMP

Compression ratio above Knee 1

DRCn_LO_COMP

Compression ratio below Knee 1

DRCn_KNEE2_IP

Input level at Knee 2 (dB)

DRCn_NG_EXP

Expansion ratio below Knee 2

DRCn_KNEE2_OP

Output level at Knee 2 (dB)

DRCn_KNEE_IP

(Y0)

0dB

DRCn

_HI_C

OMP

_LO

DRCn Input Amplitude (dB)

DRCn Output Amplitude (dB)

DRCn_KNEE_OP

Knee 1

Knee 2

DRCn_KNEE2_IP

DRCn_KNEE2_OP

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