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Review (Signal Processors)
ADT (Automatic Double Tracking) - a.k.a. Doubling - Use 15 to 35 ms delay
- Use 15 to 30 ms delay that is feedback (recirculated) to the input with a slight de-tuning
- Has a constantly changing delay that sweeps from 0 to 20ms and back and forth
- Threshold level -> below it, gate begins to close (gain reduction begins) - Ratio: Expander from 1:1.1 to 1:10, Gate from 1:12 to 1: ∞ - Used to: 1) "Turn off" unwanted signals (e.g. Mics on stage, Channels on console) 2) Shorten an envelope (faster release than normal) 3) Gated reverbs 4) Reduce amplifier hiss at end of guitar solo
One signal or processor controls another
1) De-Esser - EQ on compressor side chain - Will compress High Frequency sibilant sounds such as ’s’, ‘ch’, ‘sh’, ‘c’
2) Ducker - Voice (from Microphone) on expander side chain will cause music volume to be lowered when Mic is spoken into - Key effects: 'Gate sidechain' (e.g. Kick drum turns on LF oscillator, Snare drum turns on white noise)
- Persistence of sound in a room after the sound source has stopped - Measured by the RT60 = time for reverb to decay by 60dB
*Echo: distinct repeat of a sound. Need 35 to 50ms delay to hear it as a 'repeat'
i) Direct sound - Sound Source to listener with no reflections - Indicates the true timbre of source and location of the source
ii) Early reflection (within 50ms) - Indicates the 'size' of the room
iii) Later reflection (after 50ms) - Indicates 'surface textures' of the room
*Ratio of 'Direct' to 'Reflected' sound (Dir/Ref) - Indicates 'distance' from sound source to listener
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