STA381BWS datasheet(34/174 Pages) STMICROELECTRONICS

34 / 174 page

Device overview

STA381BWS

34/174

DocID018937 Rev 7

The STC reacts differently depending on these three parameters (Figure 12):



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 13).

Figure 12. STCompressorTM behavior

INPUT

[dB]

C.T.

L.T.

L.T. comp

C.R.

C.T.

L.T.

Compression Zone

Limiting Zone

Linear Zone

Obsolete

Product(s)

- Obsolete

Product(s)

STA381BWS Datenblatt(PDF) 34 Page - STMicroelectronics