Electrical audio signal processing systems and devices – Including amplitude or volume control
Reexamination Certificate
1998-09-24
2001-08-07
Harvey, Minsun Oh (Department: 2644)
Electrical audio signal processing systems and devices
Including amplitude or volume control
C381S106000
Reexamination Certificate
active
06272227
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a simultaneous two-way communication apparatus using an ear microphone, incorporated in which are: a microphone or pickup mechanism for picking up bone conduction sounds (i.e., vibrations) in a user's external auditory meatus; and, a sound-pressure type speaker unit.
2. Description of the Related Art
Due to its howling problem, the ear microphone capable of performing the simultaneous two-way communication is restricted in sound volume of its received sound. In other words, the ear microphone has no problem when used in a noiseless environment, but encounters difficulties in communication when used in a high-noise environment. Such difficulties often makes it substantially impossible for the user to use the ear microphone. Especially, most of the ear microphones each using an acceleration type pickup unit have their resonance points in a frequency range of from about 2 to about 5 KHz, and, therefore are apt to raise howls in use.
As described above, in the ear microphone, particularly, in the simultaneous two-way communication type ear microphone using the acceleration type pickup unit, there is found the howling problem. Due to its howling problem, the simultaneous two-way communication type ear microphone is not capable of sufficiently increasing in sound volume its received sound, and, therefore disadvantageous in this respect.
SUMMARY OF THE INVENTION
Consequently, it is an object of the present invention to provide a simultaneous two-way communication apparatus using an ear microphone, which solves a howling problem encountered in transceiving sound signals, permits a user to increase in sound volume his received sound, and also permits the user to use this communication apparatus even in a high-noise environment and the like.
According to a first aspect of the present invention, the above object of the present invention is accomplished by providing:
A simultaneous two-way communication apparatus using an ear microphone, comprising:
a transceived sound volume control circuit, which controls in sound volume a sound being transceived, and is interposed between: an ear microphone containing both a microphone and a speaker unit; and, a communication system such as a PHS communication system and like communication systems;
the transceived sound volume control circuit comprising: a communication switching means for performing a switching operation in communications; a high-frequency-signal cutting means, which attenuates a received sound signal in a transmission mode and then cuts a high-frequency signal contained in the received sound signal thus attenuated; and, a transmitted-sound-signal attenuating means for attenuating a transmitted-sound signal in a reception mode.
According to a second aspect of the present invention, the above object of the present invention is accomplished by providing:
The simultaneous two-way communication apparatus using the ear microphone, as set forth in the first aspect of the present invention, wherein:
the simultaneous two-way communication apparatus further comprises a means for cutting energy in the vicinity of a resonance point of the microphone.
According to a third aspect of the present invention, the above object of the present invention is accomplished by providing:
The simultaneous two-way communication apparatus using the ear microphone, as set forth in the first or the second aspect of the rpesent invention, wherein:
the simultaneous two-way communication apparatus still further comprises a means for detecting energy in the vicinity of the first formant of a sound in order to prevent the switching operation from being initiated due to extraneous noises and the like.
REFERENCES:
patent: 6128383 (2000-10-01), Takeyama
Browdy & Neimark
Harvey Minsun Oh
Temco Japan Co, Ltd
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