Signal Processing II


Dynamic Controls

Dynamic Range isthe difference between the loudest signal and the lowest (usually background noise.)


Compressor

Compressors reduce the dynamic range of a passage.

Then a overall gain bring the signals to a louder level keeping the dynamic range lower..

Comp_diagram.jpg (11213 bytes)

Example of a compressed signal

Comp_orig.jpg (26351 bytes) Original Signal with a sudden louder region
Comp_at_rel.jpg (25380 bytes) Compressor applied with short attack and release
Comp_slow_at_rel.jpg (25475 bytes) Compressor applied with long attack and release
Comp_high_nogain.jpg (20443 bytes) Compressor applied with high ratio, short attack and release, and no gain.
Comp_high_gain.jpg (29972 bytes) Compressor applied with high ratio, short attack and release, and gain.

Expander

Expanders increase the dynamic range. Expansio_diagram.jpg (11112 bytes)

Examples of an expanded and gated signal

Exp_orig.jpg (29810 bytes) Original signal with a sudden drop in intensity
Exp_at_rel.jpg (29317 bytes) Expanded signal with clear attack and release times
Exp_Gate.jpg (25291 bytes) Extreme case of expander - Gate

The signal is droped to a minimun