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Contents 1 Recording Level 1.1 Meters 2 Audio Effects 2.1 Compressors 2.2 EQ 2.3 Types of audio effects 3 Digital buses audio 4 Home work

Recording Level

Meters

Analog VU meter - nominal level 0dB

Digital Meter - nominal level -12dB - 16dB

Red line shows last Peak. Numbers at the top show loudest Peak.

Audio Effects

We can only affect three thing Amplitude,Time,Frequency

Amplitude

• Mute
• Normalize

Adjust volume relative to peak or nominal level

• Fade (in/out/graphic) or Envelope
• Compressor

Reduce dynamic range. As the amplitude aproaches a threshold it is reduced by a specified by a ratio

Time

• Pitch Bend/Shift

Adjust pitch up or down by semitones or cents

• Time Stretch

Strech time with or without changing pitch

Frequency

• EQ

Adjust the amplitude of certain frequencies

• • http://www.canimi.com/webnew/audiospectruma.html
  • EQ by the Octave
  • Eq Primer

Show Reverb

Compressors

todo create demo online

EQ

todo create demo online

Types of audio effects

DirectX - non destructive real time effects like TDM but runs on CPU

DirectX and TDM effect are restricted by the amount of processing power.

TDM's run on a single dedicated processor and DirectX effects run on the CPU.

Digital buses audio

Serial vs Parrallel

SPDIF - sony philips digital interface format RCA Cable http://en.wikipedia.org/wiki/SPDIF

AES/EBU Audio Engineering Society/ European Broadcasting Union XLR or fiber http://en.wikipedia.org/wiki/AES/EBU

Toslink http://en.wikipedia.org/wiki/TOSLINK

Home work

Sound for Interaction Voice Recording

Edit Voice Track as best you can