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", 000 F) ;, Patent applicant address in July, 4th, 1974, 1963 Budomon, Kadoma city Bodomon
address 100 address Address, Minato-ku, Nishi-Shinbashi 3-chome, Minato-ku, Tokyo 3-5004-3
3 ■ Japan Patent Office ■ Japanese Patent Application Laid-Open No. 52-144,010 Japanese
Patent Application No. 52. (1977) 2.3 Japanese Patent Application No. 50-qθ 423 [phase]
Application date to the (1971),! Request for examination not yet requested (all five pages)
Description Title of the Invention Binaural Recording and Reproduction Device Dummy Head
Recording and Reproduction System With the reproduction headphone having the function of a
reversible converter attached to the listener, the external sound field is collected. A binaural
recording and reproducing apparatus characterized in that it has an acoustic structure that can
be used for sound and can function as a microphone at the time of sound collection.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pinaural
recording and reproduction apparatus, and in particular, an acoustic structure that can be used
to collect an external sound field when the reproduction headphone having the function of a
reversible converter is attached to a listener. It is characterized in that it is capable of functioning
as a microphone at the time of sound collection. In the conventional pinaural recording and
reproduction system, a microphone is provided in the ear canal of the dummy head, and the
output of the microphone is listened to by headphones via an amplifier. That is, as shown in FIG.
1, the direction of each sound source known in the sound collection sound field A, distance
information is collected, and the head is picked up, and this is recorded in the recorder 2 or
directly into the headphones 3. To listen in Thus, this prior art device required two types, a
dummy head and a headphone. On the other hand, since ordinary headphones are composed of a
reversible converter, in principle they also have the function of a microphone. However, this
normal headphone can not function as a pinaural sound pickup device for the following reasons.
That is, although FIG. 2 (α) shows a general headphone, this headphone has a shielding member
4 and does not have a sound collecting function sealed by the shielding member 4. Fig. 2 (b)
shows a back-open type headphone, which receives some sound from the rear (arrow 5) but is
greatly weakened by the acoustic damping material or the protective cover 6. As a result,
sufficient sound collecting function can not be achieved. Further, the dummy head toss has a
drawback that the effect of the so-called auricle is impaired by the shielding material 4 and the
protective cover 6 when mainly affecting the front-rear feeling. Also, Fig. 2 (( The l is a so-called
open type headphone which receives sound from the direction of the arrow 5 but the main body
is too large to receive the diffraction effect and it is a drawback that it is significantly weakened
by the acoustic resistance material 8 There is. Finally, FIG. 4 (dl shows a headphone 9 of a
completely open type, but this headphone has a drawback that the output becomes almost 0
because it receives sound as shown by the arrow 5 from both the front and rear surfaces. As
described above, it is clear that the conventional headphones do not function sufficiently as a
dummy head, and it is also clear that there are problems in terms of signal to shoe tone ratio (S /
N), electrical impedance, etc. On the other hand, when a general microphone is used as a
headphone, the low output voltage becomes a problem.
There is also a problem in terms of impedance matching. The present invention seeks to provide
a pinaural recording and reproducing apparatus in which the recording and reproducing system
is simplified by eliminating the drawbacks in the above-mentioned prior art and making it
possible to use the same apparatus for sound collection micro, phone and reproduction
headphone. It is a thing. Referring now to FIG. 3, FIG. 3 is a diagram for explaining the use of the
pinora no recording / reproducing apparatus according to the present invention. In FIG. 3, 10 is a
listener, 11 is a reversible converter, and 12 is a plug. When used in connection with this plug
No. 12 amplifier O7 Iku terminal, a human acts as a kind of dummy, -head. Also, when plug 12 is
connected to the headphone output terminal of the stereo amplifier, it acts as a headphone and
uses the signal recorded as a dummy microphone as described above, with the same - Can be
listened using as headphones in Figure 4 (α) is a partial cross-sectional view of the binaural
recording and reproducing apparatus according to the present invention when an acoustic circuit
is added as one example thereof, and in FIG. 14 is a voice coil, 15 is a magnet, 16 is a magnetic
pole, 17 is a cushion material for one ear, 17 is an ear shell of a listener, 19 is a holder, 20 is a
diffraction plate, and this diffraction plate 20 Is added to improve the sound localization in the
forward direction, and if its size is about 115 compared to the size of the auricle, the human
auricle can be used. Fig. 4 (/ 11 is a schematic view of the apparatus as viewed from above; 10 is
a listener, 18 is an ear shell, and 20 is a diffraction plate, as described above. Since the pinaural
recording and reproducing apparatus according to the present invention is configured as
described above, it has the following features as compared with the conventional headphone or
microphone apparatus. (1) Since the diaphragm 13 is opened in a substantially perfect manner
with respect to external sounds, sound can be collected with high sensitivity. Further, at this time,
since the sound of the external world does not enter the concave surface inside the diaphragm
13, the amplitude of the low range does not decrease. 2 、 There is a diffraction plate (auricle)
used to judge the sense of front and back. 3. When used as headphones, the sound emitted from
the diaphragm 13 is heard. 4. Receive the tympanic impedance as load resistance at the time of
sound collection. FIG. 5 shows another embodiment of the present invention in which the
converter 21 is installed sideways (the inolarial recording / reproducing apparatus is shown, but
1.o, ts and ip in the figure are respectively the same as above). , Listeners, ear shells, holders.
FIG. 6 is a view showing an example of the case where an electric circuit is added to the device
according to the present invention, and when used as headphones, when listening to a signal
recorded by the device and when listening to a normal stereo signal. In order to provide
compatibility, this embodiment is an example in which the electric filter 22 is added to correct
the sound quality. That is, when the normal stereo sound source 23 and the signal of the sound
source 24 recorded by the present apparatus are respectively listened to by the headphone
terminal, the switch 25 is turned on or off depending on which sound source is to be listened and
the filter 22 is shorted or inserted. Sound quality correction. As this filter characteristic, an
acoustic transducer should record a sound source having a common frequency characteristic,
and the frequency response when the characteristic of the transducer is flat or similar should
give a characteristic close to that. You must. FIG. 7 shows the EndPage: 2 filter characteristic
diagram in this case, but this diagram shows the response of one ear of a sound source having a
flat frequency characteristic coming from the direction of 300. A transformer or the like may be
further added to the apparatus of FIG. 6 to increase the S / N at the time of recording or to add a
function to change the electrical impedance. The apparatus shown in FIG. 6 is different from the
conventional headphone or microphone apparatus, and further to the embodiment shown in FIG.
There is an advantage that does not change. FIG. 8 is a view showing still another embodiment of
the present invention. In the figure, 10.19.21 indicates the listener, the holder and the
transducer, respectively, as described above. In the present embodiment, in particular, the rotary
shaft 26 is provided so that the transducer can be rotated, and the listener records the
transducer outward during sound collection and turns it so as to point inward during
reproduction. To use it. According to the embodiment of FIG. 8, since the dummy head sound
collecting and reproducing system is performed by the same mechanism, there is an advantage
that the cost is reduced and the handling is easy. As apparent from the above description,
according to the present invention, the same device can be used for the sound collection
microphone and the reproduction headphone, so that the recording and reproduction system is
simplified and the cost is reduced. There is an advantage that handling becomes very easy.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a conventional sound
collecting and reproducing system, FIG. 2 is a view for explaining a structure of a conventional
headphone, and FIG. 3 is a view for explaining how to use a pinaural recording and reproducing
apparatus 4 to 6 show an embodiment of the present invention, FIG. 7 shows a characteristic
diagram of the filter 22 of FIG. 6, and FIG. 8 shows another embodiment of the present invention.
It is. 10 ··········································································· Plug, 13 ·························· Diaphragm, 14 ·········· Voice
coil, 15 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · earpieces 18 · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · converter, 22 ......... filter, 23 ......... normal stereo sound
source, sound source was recorded in 24 ...... this device, 25 ........ · Switch, 26 · · · · · · · · · rotary
shaft. Patent applicant Matsushita Electric Industrial Co., Ltd. Agent Hoshino Tsuyoshi '廟' Figure
1 Figure 8 EndPage: 3 (0) (b) (b) (C) (d) Figure 3 Figure 5 Figure 6 End Page: 4 E J, Town: List of
classes (1), (1) (2) Figure 11 'ij 1 (3) Application 11: 1 splint (4) Proxy 1 inventor Inventors other
than the above EndPage: 5
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