Electrical audio signal processing systems and devices – Binaural and stereophonic
Patent
1990-03-08
1992-03-10
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
381 24, H04R 502, H04S 100
Patent
active
050955063
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention is a device to be used in conjunction with an audio device and placed in close proximity to the listener or listening position within the sound area. The purpose of the device is to reproduce the original sound as is. The original sound as is means a recreation of the same orientation of sound source in terms of height, distance and location in the 360 degree horizontal plane, the same presence and the same "sense of sound-pressure balance" (this refers to a balance between the sound pressure that can be received by the auditory organ and that received by the entire body). Particularly when reproduction is from a biaural program source, sound reproduction indistinguishable from the original is possible. This invention concerns a sound reproduction system using a sound extinction device that makes stereo reproduction of this high order possible.
BACKGROUND OF THE INVENTION
The patents listed 1-4 below are related recent technology. only low-level information from the stereo signal source to reach the listener. achieves a sense of sound pressure by sending mechanical vibrations to tissue in the head and face. for sending mechanical vibrations directly to the body. that eliminates crosstalk between the right and let signals by means of a sound arresting device placed at the center position of the listener.
Below, (a)-(e), are listed disadvantages with the technology described above.
(a) The listener to stereo sound reproduction is usually within a few meters distance of the speakers. Subsequently, the balance of sound pressure that the listener experiences is from a state of immediate proximity to the sound. This differs greatly from sounds encountered in nature or in a concert situation.
Most program sources are sounds signifying a distant source.
Therefore, there is often a gap between the body's awareness and the experience of the ear. This gap is responsible for the undesirable effect of a "floating" orientation. (Music listened to over headphones present the most extreme instance of the phenomenon.)
For the above reason it is impossible to achieve a stable and earthbound sound experience through the existing reproduction technology.
(b) Regardless of the nature of the program source, it is possible for the listener of a conventional stereo reproduction to clearly identify the location of the speakers. A particular reverberation is created at the listener's head according to the angle at which the sound penetrates. As long as this sound enters the ear, it is easy for the listener to recognize the sound source. Especially in cases such as conventional stereo reproduction, in which the direction of the sound source is simple to describe, this cranial reflection is very strong.
In the above manner, the listener hears stereo superfluous information. Because of the gap that has existed between the genuine image and the "ghost images" from the program source, stereo listeners have always been forced to listen to a peculiarly artificial type of reproduced sound.
Further, even when a biaural program source is used, the cranial reflection effect kills the orientation information included in the biaural system.
Invention (1) described above has the drawback that its effects are negated unless the position, orientation and angle of the head are kept fixed.
(c) It is possible to induce an effect of greater distance from the sound source by increasing the number of speakers, but at the same time, the distance between speakers is necessarily reduced, resulting in greater interference between speakers, increasing distortion. This distortion also kills biaural orientation information, making the enjoyment of biaural program sources impossible.
Japan patent early disclosure 107794/83 and Japan patent utility model 103909/77 contain technology that allows the sensation of sound pressure with headphones and closely-placed speakers, but inasmuch as they apply vibrations directly to the skin, their effect is unnatural.
(d) It is difficult to gain acoustical effects from directly in front of
REFERENCES:
patent: 2983790 (1961-05-01), Olson
patent: 3237713 (1966-03-01), Leslie
patent: 4219696 (1980-08-01), Kogure et al.
patent: 4712247 (1987-12-01), Swarte
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