AE250
Eddie Ciletti ( ALT instructor )

Dynamics Processors 

• Four topologies: VCA, Variable MU, FET and Opto
• VCA has widest most linear range
• FET and Opto are based on simple, resistive voltage divider
• Understanding the transfer function (see image below)
• Types of Input / Output (I/O) amplifiers
• Transformer-less (active balanced) do not add color
• Transformer-based gear and the circuits around them that are "colorful"
• Purpose of dynamics processors: utilitarian and artistic
• Utiltarian (not a religion): To limit dynamic range
• Artistic: To create excitement
• Downside of processing: reduction of sonic real estate

Read Chapters 3 & 4 in Recording Handbook plus these articles about signal processing:

• The Art of Dynamics
• Topologies Explained
• Processing Tips

TRANSFER FUNCTION
Tthe "Transfer Function" of a dynamics processor is simply the relationship between Input and Output, or more precisely, how the output is affected by the process.  This image details the relationship.  The dotted diagonal line represents no processing, above is gain, below is attenuation. 

Rob G's Bullets

 
Wednesday 19 January L1 3-6

• Common studio layout and wiring-block diagrams
• Compression theory
• Threshold, ratio, attack, release explanation
• Compression over-shoot, pumping and breathing
• rms detection, peak detection
• Detector type-characteristics
• Typical and advanced applications
• Reading assignment- Handbook of Recording Engineering chapters 3&4

Wednesday 26 January L1 3-6

• Common large format mixer layout-block diagram
• EQ theory-developments from early EQ to common four band
• Low/high pass, low/high shelf, mid-band parametric
• EQ slope, constant /variable/adjustable Q
• Distortion and phase considerations
• Feathering EQ (using three bands as opposed to one band with a large boost or cut)
• Typical and advanced applications

Reading assignment- Handbook of Recording Engineering chapters 5&6