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PHANTOM LOUDSPEAKER

IP.com Disclosure Number: IPCOM000006286D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-20
Document File: 2 page(s) / 76K

Publishing Venue

Motorola

Related People

Tucker Matzek: AUTHOR

Abstract

Consoles for large dispatch two-way radio systems are skilled at dierentiating between sounds from differ- can get rather crowded, and to put all the function mod- ent directions to sort out a large number of mobile ules within the reach of the operator, keeping the con- sources and groups, all of which are talking at the same trols for each sound source near its origin, may preclude time. It would be an advantage to add a source of sound adding an additional speaker sound source. Dispatchers without taking up additional space.

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MOTOROLA INC. Technical Developments Volume 14 December 1991

PHANTOM LOUDSPEAKER

by Tucker Matzek

  Consoles for large dispatch two-way radio systems are skilled at dierentiating between sounds from differ- can get rather crowded, and to put all the function mod- ent directions to sort out a large number of mobile ules within the reach of the operator, keeping the con- sources and groups, all of which are talking at the same trols for each sound source near its origin, may preclude time. It would be an advantage to add a source of sound adding an additional speaker sound source. Dispatchers without taking up additional space.

LOUDSPEAKER #l

APPARENT POSITION OF PHANTOM SPEAKER LOUDSPEAKER #2

Typical Master Control Panel of Console Showing Position of Phantom Speaker

  Here is a way to add a third sound source, which I will call a "Phantom Loudspeaker:' Two loudspeakers are used as at present in a console, for selected and "unselect" audio. Audio that is intended to appear at a third location, halfway between the two, is impressed at equal volume and half of normal power to the original two loudspeakers. Care is taken that the loudspeakers are connected so that they are in phase. The sound will

appear to emanate from the point hallivay between the two, forming a "Phantom" loudspeaker. The exactness of the illusion is not as important as the fact that it can bc differentiated from other radio transmissions as though it were an actual loudspeaker. It is also possibl...