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JPS5577295

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DESCRIPTION JPS5577295
Description 1, title of the invention
Sound reproduction device
3. Detailed Description of the Invention The present invention relates to an audio reproduction
apparatus that can perform excellent stereo listening by means of a low-range reproduction
speaker and an open type headphone. A conventional sound reproducing apparatus for stereo
listening has been configured as shown in FIG. 1 to FIG. First, in FIG. 1, the left and right stereos
are amplified by the amplifiers 1 and 2 respectively, and the signals are reproduced by the left
and right speakers 3 and 4, respectively. In FIG. 2, the left and right stereo sources are separated
for each band by channel dividers 5 and 6, and the separated signals are amplified for each band
by two band-limited amplifiers 7 and 8 respectively. Are reproduced by two band-limited
speakers 9 v 10. Also, the one shown in FIG. 3 reproduces the left and right stereo sources with
the left and right middle high / low tone speakers 15.16 via the amplifiers 13 and 14,
respectively, and low frequencies from the left and right stereo sources via the low pass filter
17.18. The part is taken out, this signal is mixed, and it is made into the 3D system which
reappears by one loud speaker 2 ° through the amplifier 19. As described above, various
devices have been developed as sound reproducing devices for stereo listening, but all of them
are various physical properties including sound pressure depending on the room where the
speaker is installed, that is, depending on the listening position. However, there was an EndPage:
1 defect such as a change in the acoustic characteristics that could be clearly identified as a real
change in the sense of hearing. Also, there are other sound reproduction devices that use
headphones, but those using this headphone are not affected by the room constant-but it is
necessary to reproduce the bass as it sounds on the abdomen and body. In addition to the
impossibility, there is a drawback that the sound image is concentrated at the center of the head,
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and there are problems such as increased fatigue when listening for a long time. The present
invention eliminates the above-mentioned conventional drawbacks. An embodiment of the
present invention will be described below with reference to FIGS. 4 and 5. First, in FIG. 4, 21.22
are left and right stereo sources, and the left and right stereo sources 21 ° 22 are connected to
the left and right electro-acoustic transducers 24.25 of open type headphones mounted on the
head 23 Further, the low pass filter 26.27 is connected to the left and right stereo sources 21
and 22 to take out the bass region, and the left and right bass regions are mixed and amplified by
the amplifier 28 and reproduced by one bass speaker 29 It is configured to
In the embodiment shown in FIG. 5, the left and right signals extracted by the low pass filter
26.27 are separately amplified by the amplifier 30.31 separately and reproduced by the left and
right bass speakers 32, 33. Configured to As described above, only the low frequency band is
extracted and reproduced by the speaker, and the reproduction by the open type headphones is
simultaneously listened to, so the influence of the room constant as in the case of the
reproduction only by the speaker As a result, all the drawbacks such as poor bass reproduction
and the sound image coming to the center of the head are eliminated. That is, the low frequency
range is not influenced by various physical characteristics including the sound pressure
depending on the room thickness and the listening position, and since the open type headphones
are used, the sound image comes to the center of the head Since the sound from the low-pitched
speaker also enters this open type headphone, the localization of the sound image can be further
expanded, and fatigue hardly occurs even when listening for a long time. As described above, the
sound reproducing apparatus according to the present invention is not influenced by the room
constant, and does not feel fatigue even when listening to headphones, and can obtain excellent
stereo listening in the low range, which is industrial It is of great value.
4. Brief Description of the Drawings FIG. 1 to FIG. 3 are schematic configurations showing a
conventional sound reproducing apparatus-FIG. 4 is a schematic diagram showing an
embodiment of the sound reproducing apparatus of the present invention. . 2122, ..., left, right
stereo source, 24 ° 25, ..., electroacoustic transducer of open headphones, 26.27 ° 611. Lowpass filter, 28, 30 ° 31 ······ Amplifier, 2e, 32, 33, ..., Loudspeaker. Name of agent Attorney Nakao
et al. 1 person Fig. 1 Fig. 2 f Fig. 3 EndPage: 2
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