After reading this difficult thread (I'm replying with a new title), I have simple questions about room sizes and speaker distances.
Mon, 25 Jul 2011 18:35:31 +0100, Dave Hunt <davehuntau...@btinternet.com> wrote : > The Distance Compensation (aka NFC, and not the shelf filters) > attempts to correct for the loudspeakers not producing plane waves > at the listener. > > True the "Classic Ambi rig or soundfield mike ..... record & present > distance as presented to them". The concept of a 'unit circle' only > appears in the encoding equations, which describe how to 'pan' mono > sources to produce B-Format signals. When you try to include > distance in these there is a different behaviour outside the radius > of the speakers, than inside. Direction is determined by coordinates > limited to being inside the unit circle, whereas distance (and its > effects on amplitude, time of arrival, and changes in reflections > and reverberation) must use unlimited coordinates. Then it is useful > to consider the radius of the speaker rig as unity, and all distances > as being relative to that. Imagine two rooms with proper acoustic characteristics and treatments for ambisonics reproduction: the first is 3mX4m and the other is four times larger in surface (9mX12m). In both rooms there's a horizontal hexagon of speakers, and 5 speakers are against a wall. When NFC is applied in both rooms, do they sound the same in terms of distance perception when playing the same recording? Or is the same "sound object" appear to be twice as far in the largest room? Apart from widening the listening sweet spot, are larger rooms "better" at reproducing distance cues when using the same speaker configuration? Is distance perception directly related to speaker distances? -- Marc _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
