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The present invention relates to a sound pipe for orienting a stereophonic recording /
reproducing sound field according to the head-on method in front, and its application device. (B)
Conventional technology In conventional stereophonic recording and reproduction by headphone
method, as an object to eliminate unpleasant localization occurring in the head and create a
sound field outside the head, (]) Ambience controller (2) The parting-in-a-ear type% (1) that the
housing faces against the ear canal gets a sense of spread by the phase difference between the
left and right audio signals and mixing, but the person perceives the localization of the sound It
does not control the delay (group delay) of the essential audio signal, and it is not very similar to
the sound field at the time of speaker reproduction, and is relatively expensive. (2) is an
inexpensive and effective method of obtaining forward localization using the characteristics of
the pinna, but since it does not mimic the sound path in the space of the left and right channels,
it looks like the actual speaker reproduction There is no localization of the sound image and no
sense of sound field. In both of the methods (1) and (2), the current stereo recording sets the
localization and sound field of TI 6 on the premise of the reproduction method by the speakers of
both left and right channels placed in front, The degree of improvement of the unnatural sound
image localization and the sound field feeling at the time of headphone reproduction was small.
(C) Problems to be Solved by the Invention The present invention obtains sound image
localization (including sound field reproduction) similar to that at the time of speaker
reproduction in front of the listener when reproducing 2-channel stereo recording with
headphones. The purpose is to give a device for (D) Means for solving the problem In order to
obtain a feeling of sound field and sound image localization approximated at the time of speaker
reproduction by the headphone, the delay (group delay) due to the difference of the sound wave
path is lost by the conventional theory. We considered it to be an important matter to obtain the
localization of the sound image (sound field), and realized this delay by imitating the difference in
the length of the sound path such as a tube. The basic idea of the present invention will be
described with reference to the drawings. FIG. 1 is a view of a human head as viewed from the
left side. FIG. 2 is a cross-sectional view AA of FIG. 1 taken along a horizontal plane including the
straight line connecting the right and left aural ear canal. It is FIG. 4B which simplifies the crosssectional shape of FIG. Fig. 4 is a diagram when speakers are arranged in front of a person, and
SL and SR are obtained by regarding the left and right speakers as point sound sources. The
arrows in (a) to (t) indicate how the sound waves from the left speaker of this poem proceed, and
those from the right speaker are omitted because they are symmetrical with the left speaker.
First, the sound wave emitted by the left speaker (SL) passes through the route (b) directly to the
left ear, from the left side of the forehead to the left ear (a), and from the left side of the forehead
to the right side Those that reach the right ear (C), those that reach the right ear via the forehead
center and the forehead right end, and those that reach the right ear via the pre-observer right
side are considered to be the major ones. What's more, what directly reaches the left ear, and
more? & (M) and divided into those that reach the right ear from behind ((T)). Similarly, (C) (D)
(E) also separates into those that reach the right ear directly and those that reach the left ear
from behind via the back of the head. Also, (to) and (to) pass through the forehead, and the left
and right ears are separated from each other from the front. ((S), (H)) FIG. 4 shows the path
difference caused by the head among the sound waves from the left and right sound sources, but
as shown in FIG. In addition, various route differences occur. First, those that reach the ear canal
along the tragus (a), those that reach the ear canal through the ear concha cavity (b), those that
reflect inside the ear ring and that go through the ear concha cavity to the ear canal (C) etc. It is
listed as the main route. The paths produced by these ear canals are caused by the ones of the
above-mentioned paths (i) to (su) reaching from the front to both ears (other than (h), (h))
approximately. It applies to the sound wave from the back of (G). Among the paths of these
sound waves, the shortest distance (one that is (b)) among (a) to (w), and (a) in (a) to (c). When
the length of the sound wave path is determined using a subscript, the length of the path of (b) is
pl 9, and similarly, (b) to (b) are Ω, and □ to Q lvl. Similarly, the path length of (a) (b) (c) is p91. ˜
L lcl. In the present invention, in order to create the delay time of the sound wave generated due
to the difference in the length of the sound path, it is realized by using a tube. FIG. 5 is a system
diagram of those tubes, P + to PIo represent sound tubes, C to C4 represent branch tubes, S 、, Sr
represent left and right sounding bodies, and EL and ER represent left and right earbuds. From
the point of simplification of the description, the sound pipe P I -P t. The length of is expressed as
PIPI-ρpta using the same subscript as the symbol of the name, and the length of sound paths (a)
to (s) and (a) to (c) are also g, b, ... The length of the sound conduit can be expressed by the
following equation: + .OMEGA., 1 to gtel. pp + · · · arbitrary length 2.2.
... arbitrary length Dps = R + n−D + □ 10 gP2DP4 = Q +, + −D +. ++ (lpx PS PS = N ini)-g (岨 + Ω
P 2. 2. = 1 1 m 1- g (ワ, ρ P P 2 p p ff = +) + (lpx U PI "l lbl-N + a + 10 C 2 Ω Ωps = D tel D + 11ll
Ten Ω P2 2. 2. = Ω (チ) The present invention is a method in which the inner ear type
headphone (IR), (IL) is used as a sounding body as a necklace type as shown in FIG. 6 by the
length of a tube in the range of B surrounded by thin lines in FIG. A method of finishing in a
general head phono-like manner by bending the sound path B to the band portion of the
headphone (in fact, bonding two curved plates with semicircular grooves to form a circular sound
path), pillow An embodiment such as a method of providing the sound path portion B in the
speaker may be mentioned. (E) Operation An embodiment of a necklace system constituted by a
sound channel having a route as shown in FIG. 5 will be described with reference to FIG. Earbud
stereo headphones (I L). Insert (IR) into the adapter (AL), (AR) and play stereo recording. The
sound waves emitted from (IL) and (IR) pass through a sound pipe having a B-like structure, from
the difference in path, to the ear pad (EL). There is a time delay before reaching (ER). (E) Effects
of the Invention When performing stereo recording reproduction using the device having the
configuration of the sound pipe of B according to the present invention, the user can set the
sound field (sound image) similar to that when the speaker is installed forward. You can get
localization. Also, since it is not an unrealistic sound field as in conventional headphone
reproduction, the feeling of fatigue is small, and the device can be inexpensively manufactured. 4,
Brief description of the figure Fig. 1 ... Left side view of the human head Fig. 2 ... Cross section AA
in Fig. 1 Fig. 3 ... Example of acoustic wave path at the pinnae Fig. 4 ... A simplified version of the
cross-sectional view of the head in Fig. 2 and an example of the path of sound waves emitted
from the left and right two-channel sound source in the vicinity thereof Fig. 5 · · · · · · · · · · · ·・ ・
・ Example A when the sound conduit is used as a necklace system ・ ・ ・ Cross section B by a
horizontal plane including the straight line connecting the entrance of the ear canal of both
human ears ・ ・ ・ Main constituent part H of the sound conduit H ・ ・ ・ Human head
Sectional view by A of the part (hatching omitted) H '... A simplified sectional view (hatching
omitted) R ... human body left L ... human body right SL ... left sound source SR ... right sound
source Sρ ··· Left sounding body Sr ··· Right sounding body EL · ·· Left ear pad ER ··· Right ear pad
P 1 − P la ······ Sound path C, -C4 ... branched pipe (i) ˜ (to) ... sound wave path AL ... adapter AR
for left in-ear type headphone for right inward type adapter for right in-ear type headphone for
in-head type Yoshihiko drawing of a clean book (not changed to ingenuity 7 figure χ Z figure
procedure correction writing method) A December 24, 1061, display of the case Showa 61 1
patent application No. 224 250 2, name of the invention Forward sound field by the headphone
method Resonator for sound wave delay for reproduction and application device 3, relationship
with person making correction Patent applicant address (whereabouts) b1 square cans seal yama
yoshito 4 + f convex 2-8-11104, agent rt office name 5, Date of correction instruction r't
November 25, 1986 6, object of correction
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