Electrical audio signal processing systems and devices – Binaural and stereophonic – Hearing aid
Patent
1988-04-01
1989-07-11
Ng, Jin F.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Hearing aid
381 89, 381 90, H04R 500, H04R 102
Patent
active
048479047
ABSTRACT:
Sound reproduction apparatus comprising a pair of loudspeaker systems each including a plurality of loudspeakers for producing audio signals in response to respective electrical right (R) and left (L) stereophonic signals. Each system is mounted in an enclosure with sides and a gabled or V-shaped front portion characterized in having a pair of flat, vertical panels each joined to respective ones of the sides, the panels being joined at an intersecting angle to one another of about 90 to about 120 degrees at a forwardly projecting vertical ridge. Each system has a tweeter, woofer and mid-range speaker all connected for monophonically reproducing only a respective one of the stereophonic signals, and positioned in first ones of its panels. Each system also includes at least a second mid-range speaker connected for reproducing only a difference output between the stereophonic signals by using a dual voice coil driver, the second mid-range speaker being positioned in the other of its panels. When arranged side by side and spaced apart, the difference outputs are directed away from both speakers and the monophonic outputs are directed approximately toward one another. The entire apparatus is wired so that the monophonic R output produced by the one system is produced out-of-phase with the respective R component of the difference output of the associated second midrange speaker, and similarly the L output of the other system is out-of-phase with the respective L component of the difference output from its associated second midrange speaker.
REFERENCES:
patent: 4418243 (1983-11-01), Fixler
patent: 4504704 (1985-03-01), Ohyaba et al.
patent: 4569074 (1986-02-01), Polk
patent: 4586192 (1986-04-01), Arnston
patent: 4630298 (1986-12-01), Polk et al.
patent: 4759066 (1988-07-01), Polk et al.
Boston Acoustics, Inc.
Kim David H.
Ng Jin F.
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