MM 8802 BoB Control
Purpose
The MM8802 Control devices represents the physical MM8802 in the system. It allows for monitoring of health, displaying the control voltage inputs, setting the 8 TTL outputs, and setting the input and output analog gain structure.
In addition to the audio connections, each MM8802 has 8 analog control voltage inputs and 8 TTL control output ports. Control inputs can be linked to any control in the view file using control grouping. Once done, the controls in the same group as will follow the value of the control input. Conversely, the TTL digital outputs can be grouped with any control in the system as well. For example, if a TTL output is grouped with a Gate LED, whenever the gate LED is lit, the TTL output will go high.
Card Types:
There are now four different options for inputs on the MM8802. Each card is responsible for 4 of the 8 channels supported by the MM8802, so two are required for each unit. The MM8802 will not function properly without two input card installed, even if no inputs are needed on one or both cards. There are two sets of white LEDs in the MM8802 Control Block to show you which input cards are currently installed in the physical unit. The BoB must have both bays occupied to function properly, even when the inputs won't be used. The LEDs are now placed over a block that contains the controls for working with the specific card type. These cards are as follows:
MM Line
4 = 4 line-level inputs
MM Mic 4 = 4 microphone-level inputs (can also accept line-level
with proper settings)
MM AEC 4 = 4 mic/line level inputs with Acoustic Echo and Noise
Cancellation
MM NC 4 = 4 mic/line level inputs with Noise Cancellation
Indicators
Sample Rate
Shows current sample rate of connected MM8802 hardware. This sample rate is relative to the sample rate of the first MM-DSP card in the frame's timing crystal and the currently selected compile sample rate. Rates should be within +/- 5 (Hz) of the compile rate or errors will occur.
Trouble
Indicates the MM8802 has internally detected a problem though is still able to communicate with the DPU. The indicator is automatically extinguished when the condition clears.
Note : When trouble is initially detected, a detailed error message is printed in the Terminal Window.
Locked
Lights when the MM8802 has successfully locks to the DPU and audio can be passed by the MM8802.
Comm Error
Indicates trouble in communications between the MM8802 and DPU. The indicator is automatically extinguished when the problem is no longer detected.
Input Audio Control Blocks
Input Type LEDs
Indicates the analog input board type attached to each Input Card Bay. Each input board handles 4 channels, and there are 2 input boards per MM8802. The possible values for Input Type are None, MM Line 4, MM Mic 4, MM AEC 4 and MM NC 4. Although controls may gesture in blocks that are not installed, nothing is being controlled. Also, the LEDs are only active when there is actual hardware present.
For All Input Types
Input Gain
Sets the analog gain level for the input channel. The range is different, depending on input type.
MM Line 4
Full Scale Sensitivity
The sensitivity for a respective channel. This setting corresponds to a full-scale digital signal. Only effects line input boards.
MM Mic 4
Phantom Power
Enables 48 Volts DC phantom power on the mic input.
MM AEC 4
Phantom Power
Enables 48 Volts DC phantom power on the input.
Coarse Gain
The sensitivity for a respective channel. This setting corresponds to a digital signal. The choices are 0, 25 and 55 dBu. 0 dBu is considered appropriate for line-level input signals.
Reference Select
The reference select enables you to choose which analog output is used to tell the echo canceller what to remove or cancel. In this circumstance, a "Reference" means a digital sample of the receive audio which is sent to the filter model. The choices available depend on which bay the card is installed into. For Inputs 1-4, Outputs 1 & 2 are available. For Inputs 5-8, Outputs 5 & 6 are available.
NOTE: The output reference selected should contain the audio that feeds the room's loudspeaker but should never contain the microphone's own audio.
Feature Enable
Allows you to selectively enable the Acoustic Echo Cancellation algorithm and/or the Noise Cancellation algorithm for each input channel.
Non-Linear Processing
The Non-Linear Processor (NLP) is used after the echo canceller algorithm to suppress residual audio. The NLP algorithm is smart, meaning that it only adds suppression as necessary. The choices are Off, Soft, Medium and Aggressive. The recommended initial setting is 'Soft', since if the NLP is set too aggressive, valid audio could be affected.
Noise Cancellation
This feature is automatic, needing very little user intervention to operate. It is very useful in cancelling constant level noise such as fans, air conditioning, buzz, etc. It will not effectively remove random or intermittent noise if it is less than 5 seconds in length, since the algorithm has to differentiate in real-time between noise and acceptable audio. The choices (6dB, 9dB or 12dB) tell the algorithm how much cancellation of the detected noise to apply.
MM NC 4
Phantom Power
Enables 48 Volts DC phantom power on the input.
Coarse Gain
The sensitivity for a respective channel. This setting corresponds to a digital signal. The choices are 0, 25 and 55 dBu. 0 dBu is considered appropriate for line-level input signals.
Noise Cancellation Enable
Allows you to selectively enable the Noise Cancellation algorithm for each input channel.
Noise Cancellation
This feature is automatic, needing very little user intervention to operate. It is very useful in cancelling constant level noise such as fans, air conditioning, buzz, etc. It will not effectively remove random or intermittent noise if it is less than 5 seconds in length, since the algorithm has to differentiate in real-time between noise and acceptable audio. The choices (6dB, 9dB or 12dB) tell the algorithm how much cancellation of the detected noise to apply.
Output Controls
Mute
Silences the audio on a particular output channel.
Output Gain
Sets the analog gain level for the output channel.
Full Scale Output
The output setting for a respective channel. This setting corresponds to a full-scale digital signal.
Control Voltage I/O (CV)
TTL Out
When pressed, toggles the state of the TTL output on the MM8802 (0 or 5 Volts DC).
CV Inputs
The control input signal after scaling according to the Min and Max settings in "CV Cal." See Control Input Calibration for information on setting up control inputs.
CV Calibration (CV Cal...)
Calibration is usually necessary before using the CV inputs to control other controls within MWare. The normal procedure is to set the Min and Max values to the actual real-world control you will be using before attempting to adjust virtual controls within MWare.
NOTE: If you want the action of a control linked by a control group to the CV Input control, reverse the entries in the Max and Min text blocks. You'll then get the opposite action.
Raw Input (green text blocks)
Shows the raw control input signal before scaling. The analog control inputs have an 8 bit resolution.
Max (pink text blocks)
Sets the Raw Input value which will produce a scaled value of 255. Even if the Raw Input exceeds the Max setting, the scaled Input will not go above 255.
Set Max
When pressed, the current Raw Input value is copied to the Max setting.
Min (blue text blocks)
Sets the Raw Input value which will produce a scaled value of 0. Even if the Min setting exceeds the Raw Input, the scaled Input will not be allowed below 0.
Set Min
When pressed, the current Raw Input value is copied to the Min setting.
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