all_docs
User interface and controls
Live IO controls
Name
Allow to define a custom name for each channel. This is a global name; saved and restored with the preset but not directly related to the Hardware I/O Interface. As this, it will be consistent even if you switch the Hardware I/O Interface or switch to connect to a SampleGrabber</link>.
Ref
The 
button
toggles wether the corresponding channel should be used as a reference signal.
Multiple channel can be used as reference, in which case a mono-sum of these channels is used as the internal reference signal.
Mic
The 
button
toggles wether the corresponding channel should be used as a microphone input signal, which is used
to capture the response of the system.
Multiple channel can be used as microphone input, in which case a mono-sum of these channels is used as the internal microphone signal.
Phase invert
The 
toggles
phase inversion of the selected channel on and off. This can be used to compensate another known
phase inversion somewhere else in the analog signal chain.
On/Off
The 
button
toggles delay compensation on and off. When the correct delay has been determined, engage this
button to insert a delay line in the reference channel, to align reference and measured signals, and
get correct transfer function and impulse response.
Delay value
The delay value is displayed simultaneously as:
- A number of samples (at the current sampling rate).
- A time delay, in milliseconds.
- A distance, in meters or feet.
You can manually adjust any of these values, using either keyboard input or fine increments with the up and down arrows; the two other values will change accordingly.
Please note precision of the distance value depends on correctness of the temperature value inserted in the main setup. In a concert hall with an audience present, there will probably important temperature variations, so this value should only seen as a rough measure.
Lastly, remember the delay value in samples is the master value, from which others are derived.
Find
Clicking the
button starts a new delay value computation. Previous values, whether computed using
the delay finder or entered by hand, will be erased. The algorithm accumulates a certain amount of incoming signal
before the actual computation is actually performed, to ensure the delay is always computed using
the most current audio.
Progress
An informational text showing the progress of the computation is shown when the delay find
button is clicked, as well any error potentially encountered.