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5. Appendix j, rjfl [1 record "", "'i 370-6"' ° generation. (1) M. Iil, li1i1.eta. [Phase] Japan Patent
Office 0 JP-A-51-336020 published. (1976) 3.22 Agency serial number? J リ 2 J 2 J 6 6, f, f
Specification 1, name of the invention
Listening device using wireless headphones
3) Detailed Description of the Invention The present invention relates to a listening apparatus
using wireless headphones, wherein the sound pressure approximates the sound pressure
applied to the listener's ears at any position in the speaker reproduction sound field. The purpose
is to be obtained also when listening by headphones. In general, as shown in FIG. 1 or 2, speaker
systems 8P1 @ SP2 and EIPI to SP4 are arranged at two corners or corners of the listening room
l! In the speaker reproduction sound field of the channel stereo or the gray channel stereo, in the
former, the apex vicinity of an equilateral triangle whose base is the straight line connecting the
two speaker systems SP2f, and in the latter, the center vicinity of the room 1 is the optimum
listening position. Therefore, when a large number of people listen at the same time, each person
listens at the position deviated from the optimum listening position, and the larger the deviation,
the worse the sound field. That is, the sound pressure from each speaker to the left and right ears
changes depending on the position of the listener. For example, in the speaker reproduction
sound field of co-channel stereo, if the listener approaches the left speaker, the sound image
moves to the left. Also, if the listener turns to the back, the sound pressure from the left and right
speakers will be reversed and it will get into the left and right ears and will feel the sound later.
これはlI! by moving or moving one head; This is because the fatness of the sound from each
of the two speakers C of the listener's ears C: EndPage: 1 '-changes the direction. On the other
hand, stereo headphones are designed to always obtain the same sound pressure as listening at
the optimum listening position of the speaker reproduction sound field, and a large number of
people can listen simultaneously under the same conditions. Shika-Keshiki On the other hand,
even when walking or moving his head. There is no change in the sound. This is an unnatural
thing, and it is natural that the sound pressure applied to the ear changes depending on the
position and the direction of the listener as in the case of the speaker reproduction when
reproducing with stereo headphones C 2. This leads to human being able to sense the change in
sound pressure difference between the left and right ears due to head motion and sense the
direction of the sound. The present proposal uses the effects of the binaural effects of this five
mouse movement to achieve the above-mentioned purpose. An embodiment shown in the
drawings will be described below. Fig. 3 shows an example using the magnetic field of the cochannel. In LSI, LS2, Rel or R82 is a transmitting antenna provided on the corner of the listening
room l or on the wall / ceiling O floor, and its directivity characteristic is that of the speaker
Approximate the characteristics. In the illustrated example, a directional antenna of elliptic
characteristic lAe ≠ is obtained by the combination of LSI and LSI2, and It81 and R82.
In this case, the number of transmission antennas and the number of combinations are arbitrary.
LRI · LR2, RRI * Rg2 as a receiving antenna attached to the outside or inside of the headphone
pantoko or transducer case 3, its directivity characteristics ear directivity characteristics? Approximate. In the example shown in the figure, the bi-directional antenna LRI · 旺 1 with the
center of the coil directed to the transmit antenna L811Rel and the nondirectional antenna LR 2 ·
RR 2 ¥ with the coil directed to the transmit antenna L 卿 * R 8a combine to give a cardioid
characteristic! It is a directional antenna of j '. When the listener wears the above headphones
and is positioned at the center of the listening room 1 as shown in FIG. 3, the directivity
characteristic of the transmitting antenna matches the directivity characteristic of the receiving
antenna, and the directivity characteristics of the both antennas M4t mutually Causes an
electrical signal to be generated on the receiving antenna. This electrical signal is amplified by an
amplifier built into the headphone and the headphone output is activated at the amplifier output.
In this case, if the electrical signal is large enough to activate the transducer, then no amplifier is
necessary. As a result, the right and left ears I of the listener can obtain an optimal back pressure.
When the listener turns, for example, to the right at the above position, the sound pressure of the
right ear decreases, and the left ear receives a large back pressure of the transducer 3--9-, which
simultaneously receives the electrical signals of the left and right transmitting antennas. Be Also,
when the listener moves to the right in the direction of t-, the sound pressure of the transducer
on the left side of the transmitting antenna ll81 * IJ82 obtained in the left ear decreases, and the
left ear The back pressure of the transducer, which is based on the electric signal of the right
transmitting antenna 'R Niko R8g' obtained, is further increased. Further, the sound pressure also
increases due to the right transmission antennas R81 and R82 obtained for the right ear. As
described above, according to the present invention 1: according to the present invention, even
when listening to the reproduced sound through the headphones, it can be obtained for the left
and right ears by the position キ direction of the @ holder as in the case of listening to the
reproduced sound in the speaker reproduced sound field. The sound pressure changes and you
can listen to it with a feeling of nature. Fig. Μ is an example of a 2-channel radio wave, and the
directivity characteristic 6 · 6 'of the transmitting antenna 5 lIA 2 is made similar to the
directivity characteristic of the speaker and that of the receiving antenna R 1 * Rg 7 · directivity
of the ear Thereby, the same action [strain] effect as in FIG. 3 can be obtained. Also in the case of
μ channel C2, the directivity characteristic of mutual coupling of transmission and reception
antennas is made as close as possible to the directivity characteristic of the speaker and the ear
in the 4A channel speaker reproduction sound field.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of the λ channel speaker
reproduction sound field, FIG. 2 is the same view of the μ channel, and FIG. 3 is a plan view of
the listening apparatus of the present invention of λ channel stereo reproduction. 8Pl〜
SP4ハ2ビーカVA? A, LSIa L 82 End Page: 2 R R 81 cloud R 82, Al · 2 is a transmitting
antenna, LR processing · LR2, RRI * RR2, R1 · R2 is a receiving antenna, l is a listening room 1.2
is a band, 3 is a transducer case) 4L, 6-A 'is the directivity of the transmitting antenna, and t /, 7 ·
is the directivity of the receiving antenna. Patent applicant Fujiki Electric Co., Ltd. (7) $ / 圓 茅 2
country 6 串 other inventor Zepoku 190〕 Address Tokyo, Setagaya District 2-28 〒 4 地 イ 氏
名 川 英 部-ナ Narashino Shirt butterfly ■ Address Chiba-based learning Shinobuno Fuyatsucho
5-1833; Ndo Takeo Name Takeo Kondo 9-EndPage: 3