Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Reexamination Certificate
1999-07-06
2001-07-10
Le, Huyen (Department: 2743)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Plural or compound reproducers
C381S372000, C381S373000
Reexamination Certificate
active
06259796
ABSTRACT:
BACKGROUND OF THE PRESENT INVENTION
1. Field of Invention
The present invention relates to an earpiece, and more particularly to the earpiece with a loudspeaker therein, wherein the present invention not only prevents us from directly impacting the sound pressure to the human ear but also provides us a sound wave without any high frequency noise.
2. Description of Related Arts
In 1990, the National Institutes of Health Consensus Development Conference State announced: “there are about 28 million American have hearing loss problem, among those people, at least one million people have hearing loss from high impact noise environment.” Additionally, in 1993, National Ear Care Plan claimed that approximate 1.7% of American Teen who under 18 have hearing disability. Furthermore, in 1997, UT Southwestern Medical Center stated: “approximate 20% of American Teen, between 13-19 have hearing disability. The major cause of the hearing loss is people exposed to the noise especially the impulse noise from the earpiece.” People should concern the control of the sound volume while using the traditional earpiece (continuous hearing not more than one hour or six hours per day when sound pressure at 105 dB or 95 dB respectively). In fact, this flash impulse noise contains high sound pressure and may damage the eardrum or middle ear hearing loss. It is called Conductive Hearing Loss. America's medical report recently stated that the percentage of people having the Conductive Hearing Loss is gradually increasing since earpieces are improperly used listen to the hot music such as Rock and Roll.
Moreover, earpiece receives signal from source such as Walkman or communicator devices, and transfers the sound wave to human ear which the perceptible frequency range of human being is about 20 Hz to 20 kHz. In fact, the reproductive resonance of sound wave in above frequency range is not ideal since the source of sound is not come from millions dollars of high-end musical devices but from the walkman or communicator devices. Among these signal from walkman or communicator devices exist lots of feedback or noise, so the noise of ‘beep’ sounds often found at high frequency range and ‘woo’ sounds often found at low frequency range.
SUMMARY OF THE PRESENT INVENTION
The main object of the present invention is to provide an earpiece without impulse and high frequency noise, which may reduce the sound pressure directly transmitted to the middle ear; even the impulse noise output from the earpiece, wherein the sound pressure to the middle ear will diminish as much as possible. Accordingly, the present invention can enhance people's listening enjoyment and avoid the Conductive Hearing Loss from the impact of the sound pressure.
Another object of the present invention is to provide an earpiece without impulse and high frequency noise, wherein two different sound waves are generated by the loudspeaker in the earpiece, which overlap with each other to intensify the reproductive resonance at the middle range of frequency of sound wave. Moreover, the present invention can filter and minimize the noise or feedback at higher frequency range.
Another object of the present invention is to provide an earpiece without impulse and high frequency noise, wherein the sound output from the earpiece obtains the functions of resonance intensity and noise attenuating which can purify and clarify the sound.
REFERENCES:
patent: 4239945 (1980-12-01), Atoji et al.
patent: 6084976 (2000-07-01), Lin
Chan Raymond Y.
David and Raymond Patent Group
Le Huyen
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