The Logic7 algorithm creates a 7.1 surround upmix from a stereo (or dual mono) audio signal.
This object upmixes two-channel stereo (or dual mono) audio inputs to seven main outputs (L/R Front, Center, L/R Side, L/R Rear). The algorithm consists of a steering angle calculator from the input signal. A matrix mixer generates the surround channels by mixing input Left and Right channels weighted by adaptive gains calculated from steering angle. Allpass filters adjust the phases between Left & Right pairs of generated surround channels and Shelving filters are applied.
The number of output channels is fixed as eight main outputs.
The output channel order is:
- Left Front
- Right Front
- Center
- LFE
- Left Side
- Right Side
- Left Rear
- Right Rear
Tuning:
- Side Left / Right Steering Limit
- Side Center / Surround Stereo Limit
- Side Center / Surround Mono Limit
- Rear Left / Right Steering Limit
- Rear Center / Surround Stereo Limit
- Rear Center / Surround Mono Limit
- Side Shelf Type
- Rear Shelf Type
- Matrix Type
- Steering XOver Frequency