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 the steering angle. All pass filters adjust the phases between Left & Right pairs of generated surround channels and Shelving filters are applied.
Logic 7 Properties
Below table describes about the Logic7 audio object properties and functionality.
| Properties | Description |
| Display Name | Display the name of the Logic7 audio object in signal flow design. It can be changed based on the intended usage of the object. |
The object has a 2 input channels and 8 output channels. The output channel order is:
- Left Front
- Right Front
- Center
- LFE
- Left Side
- Right Side
- Left Rear
- Right Rear
This object supports all framework configurable sample rates and block lengths.
Mode
There are no mode available for Logic 7 audio object.
Additional Parameters
There are no additional parameters available for Logic 7 audio object.
Tuning Parameters
| Parameter | Description | Unit | Min | Max | Default |
| Matrix Type | Determines the amount of center channel blending across the left and right front channels and the degree of spatial separation between the side and rear channels.
|
None | 0 | 1 | 1 |
| Steering XOver Frequency | Determines cross over frequency of the low pass filter that is used to extract the low pass signals | Hz | 10 | 500 | 200 |
| Side Left / Right Steering Limit | Determines the amount of front left and right signals mixed into the side channels | deg | -45 | 45 | 25 |
| Side Center / Surround Stereo Limit | Determines the amount of center channel signal that is mixed into the side channels | deg | -45 | 45 | 20 |
| Side Center / Surround Mono Limit | Determines the amount of monaural source signals that are mixed into the side channels | deg | -45 | 45 | 20 |
| Rear Center / Surround Mono Limit | Determines the amount of monaural source signals that are mixed into the rear channels | deg | -45 | 45 | 20 |
| Rear Left / Right Steering Limit | Determines the amount of front left and right signals mixed into the rear channels | deg | -45 | 45 | 25 |
| Rear Center / Surround Stereo Limit | Determines the amount of center channel signal that is mixed into the rear channels. | deg | -45 | 45 | 20 |
| Side Shelf Type | Refers to a high frequency shelving filter that is applied to signals steered to the side channels only
|
None | 0 | 2 | 0 |
| Rear Shelf Type | Refers to a high frequency shelving filter that is applied to signals steered to the rear channels only
|
None | 0 | 2 | 0 |
Tuning Panel
Control Parameters
There are no control parameters available for Logic 7 audio object.
Native Panel
Logic 7 audio object does not support native panel.