Abstract: An array of speakers are fed from a single source of audio frequency sound but each speaker transmits the sound delayed by an amount which is determined by the distance between a particular speaker and a selected region in space, so that sound from each speaker constructively adds at the selected region in space. A sufficiently large number of speakers are employed so that when sound reaches a region in space at the same moment in time the audio volume will be increased substantially over sound in regions where there is not constructive interference. This simple technique allows audio frequency sound to be heard in only selected regions within the room or other auditory space. Multiple regions with multiple soundtracks can be created by simultaneously playing variously delayed soundtracks over each of the speakers in the array.

Abstract: An array of speakers are fed from a single source of audio frequency sound but each speaker transmits the sound delayed by an amount which is determined by the distance between a particular speaker and a selected region in space, so that sound from each speaker constructively adds at the selected region in space. A sufficiently large number of speakers are employed so that when sound reaches a region in space at the same moment in time the audio volume will be increased substantially over sound in regions where there is not constructive interference. This simple technique allows audio frequency sound to be heard in only selected regions within the room or other auditory space. Multiple regions with multiple soundtracks can be created by simultaneously playing variously delayed soundtracks over each of the speakers in the array.

Abstract: In the jackbox of the present invention, a number of electrical connectors are releasably connectable to electrical leads carrying electrical signals representative of at least one physiological patient parameter from the patient to patient monitoring equipment. Preferably, the jackbox has an openable enclosure for gaining access to electrical connectors therein. When closed, the enclosure preferably substantially surrounds the electrical connectors and ends of the electrical leads. The enclosure can have a clamshell, book, or other form as desired. Although an openable enclosure is preferred, some embodiments of the jackbox have no enclosure or have an enclosure not permitting user access to the interior thereof. Enclosures according to different embodiments of the present invention are made of resilient and relatively non-deformable, semi-deformable, or deformable material.