Sound recording and reproduction systems

Details Sound recording and reproduction systems Sound recording and reproduction systems

2006-07-04

2006-07-04

Lee, Ping (Department: 2644)

Electrical audio signal processing systems and devices

Binaural and stereophonic

Pseudo stereophonic

C381S001000

Reexamination Certificate

active

07072474

ABSTRACT:
Sound recordings are played through a closely-spaced pair of loudspeakers with a predetermined listener position having an included angle of between 6° and 20°, and filter means being employed in creating said sound recordings, the filter means having characteristics such that when the sound recordings are played, the need to provide a virtual imaging filter means at the inputs to the loudspeakers to create virtual sound sources is avoided, the sound recording being such that when played through the loudspeakers a phase difference between vibrations of the two loudspeakers results where the phase difference varies with frequency from low frequencies where the vibrations are substantially out of phase to high frequencies where the vibrations are in phase, the lowest frequency at which the vibrations are in phase being determined approximately by a ringing frequency, f0.

REFERENCES:
patent: 5333200 (1994-07-01), Cooper et al.
patent: 0 434 691 (1995-03-01), None
patent: 2181626 (1987-04-01), None
patent: WO 94/01981 (1994-01-01), None
patent: WO 94/27416 (1994-11-01), None
patent: WO 96/06515 (1996-02-01), None

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