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  • Distance vs Stereo Positioning in MIR Pro

    I wrote a few months ago regarding the use of Distance-Dependent Scaling in MIR Pro. 
     
    1. This seems to mainly effect the volume of the dry signal as the instrument is moved around in 
    the room. If this option is off, The actual instrument's position in the room does not really matter 
    and you would have to use it's dry/wet slider to change the perceived distance. 
     
    2. After some additional testing, I noticed that regardless of this setting, placing an instrument 
    closer or further back in the room also effects the perceived stereo location and width. This makes 
    sense since the stereo field tends to narrow the further the sound source is. I was trying to determine 
    the exact setting where the stereo positioning is equal to the original input signal. In the Teldex room, 
    if I place an instrument at exactly 0-depth with a width of approx. 14 meters (around the width of the 
    room) the original stereo image of the input signal is exactly the same. As the depth decreases though, 
    (closer to the mics) the stereo width actually widens beyond the original signal, and the opposite is true 
    as the depth increases (further from the pics). Unfortunately this 0-setting for depth does not seem to be 
    the same for other rooms such as Sage Hall. I assume each room is different in this respect. In fact, the 
    farther you increase an instrument's depth in certain rooms, the instruments width may have to be increased 
    dramatically (beyond the width of the actual room itself) in order to maintain the full stereo width of the 
    original input signal. 
     
    I'm just trying to figure out at what point the actual original stereo signal is becoming effected by its 
    placement in certain rooms, and by what amount (increasing or lessening the stereo field). This may 
    not seem as important when using VSL instruments with MIR Pro, but can be quite important when using 
    other libraries, especially ones that are recorded "In Situ' and already have some room sound to them. 

  • Hi KMM08,

    the answer to your first question is easy: Distance Dependent Scaling is indeed a feature that affects only the direct signal component of MIR (... we had high hopes that this would be made obvious enough by its headline in MIR Pro's GUI, "DRY SIGNAL SETTINGS").

    The answer to your second question is not as straight forward as the first one, though. It is important to understand that every signal that's put on one of MIR Pro's stages gets ENcoded to Ambisonic format, to make sure that the virtual position of the direct signal and its related impulse responses match perfectly when DEcoded from Ambisonics to whatever Output Format you have chosen to use. The result achieved by this decoding process is not only varying regarding the number of channels (Stereo, LCR, Quadro, Surround ...), but also in respect of the chosen Venue and its geometry, and of course in respect of MIR's Main Microphone setup (X/Y, Blumlein, M/S, LCR, ...), its distance from the stage, and the characteristics of its virtual capsules (omni, cardioid, figure-8 ...). 

    ... in other words: There is no "original stereo signal" inside MIR, by definition. Actually, it is common practice to get rid of any signal-inherent panning information before MIR Pro can do its "magic". ;-)

    Kind regards,


    /Dietz - Vienna Symphonic Library