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Tsukuon power ν タ Seiden タ 1 1, name of the invention Voice transmission law under noise
Name Ono Ono 4, agent 〒 107, 0 Japan Patent Office Open Patent Publication ■ 蒔 51-583230
公開 昭 51. (1976) 521 N./N.-N. Specification 1, Title of the invention 1, Title of the invention
Voice transmission method under noise
2, inventor
3. Detailed Description of the Invention The present invention relates to a voice transmission
method under noise, and more particularly to a voice transmission method using an ear
microphone utilizing sound pressure generated in the ear canal and a close talk microphone used
on the lips. Conventionally, as the voice transmission method under noise, there are many cases
where uni-directional microphones are used for the lips, as shown in the example of a telephone
exchange hand, but this uni-directional microphone eliminates external noise There is a limit in
On the other hand, although it has been conventionally known how to transmit using sound
pressure generated in the speaker's own ear with vocalization, this ear microphone also has some
problems due to its characteristics. . One is the point of the frequency characteristic, and the
second is the point that the sensitivity is observed in principle. That is, the ear microphone has its
frequency characteristic limited to 100 to 2,000 Ftz to obtain voice transmitted by bone
conduction, and the ear microphone emphasizes low frequency components for the effect of the
ear canal closing effect. Need to be corrected mechanically or electrically, which results in a
decrease in sensitivity. However, since this ear microphone makes use of the sound pressure
generated in the speaker's own ear, the S / N ratio to external noise can be improved by about 30
db by normal use. However, since the sound pressure in the ear canal is about -15 db as
compared to a close talk type microphone, the difference is only an improvement of the S / N
ratio of about 15 db, and in high noise, other methods Need to be removed. And in this external
environment EndPage: 1 noise, energy concentration is seen in the low region in the normal case.
Next, considering the quality of voice, natural voice transmission requires a wide range of
frequency components in the town, and in particular, high-frequency components are
indispensable for crisp voice transmission of consonants. From this point as well, the abovementioned ear microphones with limited frequency components are not satisfactory. Also, when
human hearing hears its own voice, the frequency component of low frequency is bone
conduction sound, and the frequency component of low frequency is a large proportion of air
conduction sound that can be heard by valveing the lip. The present invention has been made
focusing on the point on the eyebrow, and uses a known ear microphone that utilizes the sound
pressure in the ear canal as a low frequency component and limits the frequency of a known
close talk type microphone by using a band. By constructing one microphone for frequency
components, it has been found that the improvement of the S / N ratio to the external noise and
the improvement of the sound quality can be simultaneously performed, and the present
invention has been completed. That is, the present invention improves the S / N ratio to external
noise and enables voice transmission even during high noise, and at the same time, by obtaining
a wide range of frequency components, it is possible to achieve close voice, especially consonant
sound. An object of the present invention is to provide a voice transmission method capable of
transmitting high-quality and low-quality voices.
The object of the present invention is to introduce the output signal of the ear microphone
utilizing the sound pressure generated in the ear canal to a band pass filter which passes low
frequency components below a certain frequency, and the output signal of the close talk type
microphone has a certain frequency or more High-frequency components are led to a bypass
filter, the output signals of both filters are led to a level adjustment unit, bell tone J is performed,
and transmission is performed by an oscillator or the like. More specifically, 50-io, oo. A
condenser type microphone that is flat up to Hz is inserted into the external ear canal or is
connected to the external ear canal through a communication tube etc. to make an ear
microphone, and an output signal of this ear microphone is an equalizer, for example After
performing auditory sense correction according to the characteristics, it is inputted to a band
pass filter which passes only low frequency components of 5o to 2e 000 Hz. On the other hand,
the output signal of a unidirectional microphone (for example, a condenser microphone flat to 50
to 10,000 Hz) provided in the lip is input to a bypass filter that allows only high frequency
components of 2.000 to 6.000 Hz to pass. 1) Band-pass filter kl '-The output signal of the filter 1bus filter is inputted to the level-adjustment section to perform level adjustment, then it is
oscillated and may be inputted to the unit for transmission. Therefore, according to the method
of the present invention, the low frequency component of 50 to 2,000) 1z of the transmission
signal is obtained from the sound pressure generated in the user's own ear hole. The external
noise is hardly included, and only the speaker's own. On the other hand, since the high frequency
component of 2, 'ooo to 6,000 Hz taken from the lip microphone is included, it is possible to
obtain a near natural sound, in particular a high quality sound with good crispness of the
consonant. Because normal noise often concentrates energy in the low range, this high range. · · ·
The external noise contained in the wavenumber component can be almost ignored-it can be
completely ignored, especially when used as a telephone exchange hand, since the external noise
is mostly low frequency components. It can be ignored. Patent Assignee Hiroshi Ono Attorney
General Attorney Sakaguchi Nobuaki Sakaguchi (Other 1) EndPage: 26, Other than the above
address Address, Minato-ku, Akasaka, 3-chome, 10-5, Akasaka Quinnville, 4th floor Name (7023)
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