STA381BWS datasheet(31/171 Pages) STMICROELECTRONICS

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STA381BWS

Device overview

Doc ID 018937 Rev 6

31/171

The STC reacts differently depending on these three parameters (Figure 10):

●

level meter output value < compressor threshold < limiter threshold: under these

circumstances the signal level is small enough to not require any type of

limiting/compressing action. The signal remains unchanged.

●

compressor threshold < level meter output value < limiter threshold: under these

circumstances the signal level is compressed to a ratio determined by the compressor

rate.

●

compressor threshold < limiter threshold < level meter output value: under these

circumstances the signal level exceeds the limiter threshold which represents the

maximum output power allowed. The signal is limited to avoid unpredictable effects and

damages.

The compressor threshold, the limiter threshold and the compressor rate are all user-

selectable parameters. The compressor threshold range of value is [-48, 0] dB with a

0.25 dB step. The limiter threshold range of values is [-24, +12] dB with a 0.25 dB step. The

compressor ratio range of value is [0, 15], the meaning of these values is specified in

Table 10. For further details please refer to Table 12. Either setting the compressor rate to

1:1 or setting the compressor threshold greater than the limiter threshold makes the STC

behave as a pure limiter (Figure 11).

Figure 10.

STCompressorTM behavior

INPUT

[dB]

C.T.

L.T.

L.T. comp

C.R.

C.T.

L.T.

Compression Zone

Limiting Zone

Linear Zone

STA381BWS 데이터시트(PDF) 31 Page - STMicroelectronics