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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sound pressure-frequency characteristic
diagram when sound waves emitted from a speaker are picked up by a dummy head, and FIG. 2
is a cross section of a pinaural sound reproducing apparatus according to an embodiment of the
present invention. Fig. 3 and Fig. 3 are sound pressure-frequency characteristics when the device
of the present invention is mounted on a dummy head. 0.1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · Support ring, 8 · · · and vibration L9 ······ bobbin, 10 ... ... voice coil, 11 ... ... the cover plate,
12 ...... air chamber, 13, 13 '..... · Airway, 14.14 '· · · · · · · · · Tubes 15, 15' · · · · · · · · breathable
attachment, 16, 16 '· · · ... ear, 17, 17 '...... ear canal.
DETAILED DESCRIPTION OF THE INVENTION-The present invention directly transmits the five 6
'7-2 sound waves emitted from the electro-acoustic transducer to the left and right ears of the
listener via a pipe-like sound transmission passage. The invention relates to a pinaural sound
reproducing apparatus. Generally, when listening to a sound source by placing it in the vicinity of
the listener's ear like a sound reproducing device such as headphones or earphones, it is different
from the case of listening to the sound source far away like a speaker listening etc. Since the
diffraction effect of the head of the listener is removed, the listening state is completely different.
SUMMARY OF THE INVENTION The present invention provides a pinaural sound reproducing
apparatus capable of obtaining the same effect as reproduction and listening in free space, such
as speaker listening, in pinaural hearing. The m1 figure has a head shape, an auricle and an ear
canal similar to those of human beings, and a dummy head with an IC microphone in each
binaural canal is used. Place a speaker with the following characteristics, and -t one of the
dummy heads. The sound pressure-frequency characteristic of the microphone of moth is shown.
As is apparent from Fig. 1 and Fig. 1, when listening to the sound radiated from the flat power of
the flat characteristic, it does not become a flat sound pressure-frequency characteristic, but has
two peaks. Sound pressure-frequency time. These two peaks are the effect of the head diffraction
and the reflection of the two. This is considered to be caused by echoes from the pinna and
resonance in the ear canal. The present invention provides a pinaural sound reproducing
apparatus capable of obtaining a sound pressure-frequency characteristic having two peaks
shown in FIG. 1 in pinaural hearing, and FIG. 2 shows one embodiment of the present invention.
It explains with. In FIG. 2, reference numeral 1 denotes a frame, in which an electrodynamic
speaker is housed. The electrodynamic speaker comprises a lower plate 4 integrally provided
with a center pole 3 having a hole 2, an annular magnet 6 fixed to the upper surface of the lower
plate 4, and an upper surface of the magnet 6. A ring-shaped upper plate 6, a dome-shaped
diaphragm 8 supported by a support ring 7, a bobbin 9 fixed at one end to the dome-shaped
moving plate 8 and a voice coil wound around the bobbin 9 The voice coil 10 is disposed in a
magnetic gap formed between the inner peripheral surface of the annular upper plate 6 and the
outer peripheral surface of the center pole 3. Reference numeral 11 denotes a cover plate which
covers one end of the frame 1. An air chamber 12 is formed in the frame 1, and the air chamber
12 communicates with the hole 2 of the center pole 3.
The cross-sectional area of the air chamber 12 is larger than the cross-sectional area of the hole
2. 13 ° 13 'is an airway formed in the frame 1, and the airways 13, 13' are branched from the
side of the air chamber 12. 14.14 'are tubes, and one end of each of the tubes 14, 14' is fitted to
the outlet end of the airway 13, 13 '. The cross-sectional area of the tubes 14 and 14 'is smaller
than the cross-sectional area of the airway 13.13'. At the other end of each of the tubes 14 and
14 ', there is provided a breathable attachment 15 or 15' such as maltobrene or home rubber.
The other end of this pair 14.14 'is attached to the left and right ears 16.16' of the listener,
respectively, and the sound wave transmitted in the tube 14 '14' directly leads to the ear canal
17, 17 '. It is something to be eaten. When an electrodynamic speaker signal is applied in FIG. 2,
the diaphragm 8 vibrates and emits a sound wave. This sound wave is a hole in the center pole 3.
It is led through the air chamber 12 to the ear canal 17, 17 'through the airway 13.13' and the
tube 14.14 'to reach the tympanic membrane. FIG. 3 shows the result of adding the sound
pressure-frequency characteristics of the right ear or the left ear by attaching the attachments 15 'shown in FIG. 2 to the left and right ears of the dummy head, respectively.
Similarly to the sound pressure-frequency characteristics in the speaker listening shown in FIG.
1, two peaks occur. One of the two peaks is due to the resonance due to the hole 2 and the air
chamber 12 which have different cross sectional areas, and the other is due to the resonance due
to the airways 13.13 'and tubes 14 and 14' which have different cross sectional areas There are
six in it. The characteristics shown in FIG. 3 are the characteristics of the embodiment having the
following dimensions. Diaphragm diameter of electrodynamic speaker--------------------------------------111 111 φ Inner diameter of the hole of the center pole, length ... 4.6 dragon φ, 911 m Air
chamber "" '· 10m11φX6m1l airway ....... 3 Tomo φX40m11 Chiyubu ....... 21IIIlfai × as
described above 1 m, while a Painoraru listening according to the present invention, a speaker
listening as well as the sound pressure - Two peaks occur in the frequency characteristic, and the
following effects can be obtained. (1) Despite direct listening to both ears, it is possible to
reproduce the same sound field as listening to a speaker in free space. (2) The structure is simple
and can be manufactured inexpensively. (3) For the reason (1), unlike the conventional
headphone hearing and earphone hearing, it is possible to remove pressure and pressure on the
head at the time of hearing.
Although the embodiment shown in FIG. 2 uses an electrodynamic speaker 7, the same applies to
other loudspeakers, and the direction of the electrodynamic speaker shown in FIG. Sound waves
emitted from the front can also be used. In this case, it is necessary to separately form a hole
corresponding to the hole of the center pole in the frame.