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JPS5324803

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DESCRIPTION JPS5324803
Description 1, title of the invention
Monaural playback listening device
3. Detailed Description of the Invention The present invention eliminates the disadvantage of
listening to a monaural signal obtained by a radio receiver, television receiver, tape recorder
player, etc. with an earphone etc., ie, the defect that the sound image is localized in the head The
present invention relates to a monaural reproduction listening apparatus that can be used. When
playing a monaural signal obtained with a radio receiver or the like to pz with a speaker and
listening to it, the sound emitted from the speaker is direct sound as direct sound! While
reaching the listener's ears, it is reflected by the wall of the sleeping room, 'floor, ceiling, etc. and
reaches the ears as indirect sound O When the combined sound of direct and indirect sounds
reaches the ears in this way, The listener recognizes the sound image outside the listener's head.
EndPage: 1 This is because indirect sound contributes to the sense of distance in the sound
image. On the other hand, when a monaural signal obtained by a radio receiver or the like is
reproduced by an earphone or the like to be heard, the sound image is localized in the head of
the listener. This is because, in the case of listening with the earphone, no indirect sound is
included unlike the case of the speaker listening. In view of the above-described point, the
present invention generates indirect sound through a reverberation (divergence) addition device
of an acoustic system by generating a sound reproduced by a single-time acoustic transducer
such as an earphone or a speaker. The present invention provides a monaural reproduction and
listening apparatus in which a sound image is localized out of the head by mixing it directly with
sound and listening to both ears of the synthesized sound. The present invention will be
described in detail below with reference to the drawings. FIG. 1 is a block diagram showing a
basic configuration of the device of the present invention. In FIG. 1, 1 is a signal source such as a
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radio receiver, tape recorder, tuner, player, etc. It passes through the passages 4 and 6 and is
transmitted as a direct sound to the listener's left and right ears. Reference numerals 6 and 7
denote supports provided at the end of the sound wave transmission paths 4 and 5, respectively,
which are attached to the ears of the listener. Reference numerals 8 and 9 are phase shifters for
phase-shifting the sound waves generated by the electroacoustic transducer 3. The sound waves
phase-shifted by the displacing device 8.9 have sheep 180 degrees out of phase with each other.
After passing through the phase shifters 8 and 9, they are delayed by the delay means 10.11 and
become indirect sounds, respectively, and these indirect sounds are mixed with the direct sound
by the coupler 12.13. The mixed sound of the direct sound and the indirect sound is transmitted
to the left and right ears of the listener through the sound wave transmission passage 14.15.
Next, an embodiment of the present invention will be described with reference to FIG. A signal
sent from a signal source 1 such as a radio, a television receiver, a tape recorder or the like
amplifies a voltage necessary for driving the electroacoustic transducer 3 by the amplifier 2 to
drive the electroacoustic transducer 3.
The electro-acoustic transducer 3 emits sound waves to both sides of the front chamber 19 and
the rear chamber 2 o by the cabinet 18. In this case, since the front chamber 19 and the rear
chamber 20 are divided into the front side and the rear side of the electroacoustic transducer,
the generated sound waves' also have a phase difference of 18 o 0 respectively. This function
applies to Fig.1. It corresponds to the phase shifters 8 and 9 when considered. In addition, sound
waves generated in the front chamber 19 of the electroacoustic transducer 3 and the sound
waves generated in the rear chamber 20 are passed through the sound wave transmission
passage 16.17 for delay to give remaining effects and become indirect sound. It is. At this time,
the passage lengths of the direct sound wave transmission passages 4 and 5 are 14. Assuming
that the passage length of the delaying (inter-contact) sound wave transmission passage 16.17 is
R 16 and the sound speed is C, the reverberation (delay) time tr becomes and the delaying
(indirect) sound wave transmission passage 16.17 is By passing through, a reverberation
(longitudinal) effect is generated, and the above-mentioned direct sound wave and indirect sound
wave are mixed at the connection point 12.13 with the sound wave transmission path 4, 5 and
the listener is heard by the synthetic sound / wave transmission path 14, 15. It is transmitted to
the ear of 21 and is transmitted to the left and right ears via the support members 6 and 7. , ': 4
the above reverberation (delay) time t, r can be taken longer as the passage length 1e + 1 □
of the sound wave transmission delaying means 16': 1 '16 communication passage is longer,
directly It is necessary to make the passage length β 49 ° C. of the sound wave transmission
passage 4.5 as short as possible. The phase difference and reverberation (delay) time of indirect
sound as described above play a large role in the external localization of binaural monaural
playback and listening, and in particular, control of reverberation time is extremely important,
and the device according to the present invention The cost of the 9 parts is extremely cheap as
possible due to the simple structure. FIG. 3 is intended to make the shape compact based on the
embodiment of FIG. 2, in which the sound wave transmission passage 16.17 for delay is in the
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form of a vortex. In FIG. 3, the same suction valve as FIG. 2 will be described with the same
reference numeral. In FIG. 3, reference numeral 22 denotes a cabinet, and an electroacoustic
transducer 3 is disposed in a central space portion of the cabinet 22, and the space portion is
converted to the electric sound by the transducer 3 to form a front chamber 19 and a rear
chamber 20. It is divided into The space portion of the cabinet 24 is 挾 EndPage: 2 and delay
sound transmission passages 16.17 are formed on both sides. The delaying sound wave
transmission path 16 ° 17 is a spiral path a, b, C or a / respectively. b 'and C' are connected, and
as shown in FIG. 4, the central portion of the spiral passage a of the first layer communicates
with the front chamber 19 as shown in FIG. The outermost periphery of the first layer a is joined
to the outermost periphery of the second layer,
The central end of the gauze is the third layer. The outermost edge of the third grid C is coupled
to the center end of C, and is directly coupled to the acoustic wave transmission passage 4. The
other delay sound transmission passage 17 is also configured in the same manner as the abovementioned delay sound transmission passage 16). According to the embodiment shown in FIG. 3,
since the delaying sound wave transmission ilt +% 16 and 17 are made spiral, the cabinet 22 can
be miniaturized by plastic molding of the resin. FIG. 5 is a block diagram showing another basic
configuration different from that of FIG. 1. The difference from FIG. 1 is that two electroacoustic
transducers 3, 3 'are used for direct sound system,', indirect It is a point for sound system. As
described above, when two electroacoustic transducers 3 and 3 'are used, the direct sound
system and the indirect sound system can have dedicated functions respectively, and the indirect
sound electroacoustic transducer 3' Is advantageous in that the sound pressure output, band, etc.
can be selected arbitrarily regardless of one standard of the direct sound electro-acoustic
transducer 3. A specific example is shown in FIG. The signal from the signal source 1 is amplified
by the amplifier 2 and applied to the direct sound electroacoustic transducer 3 and the indirect
sound electroacoustic transducer 3 '. The direct sound electroacoustic transducer 3 is housed in
the cabinet 23, and the sound wave radiated from the electroacoustic transducer 3 is directly
transmitted by sound waves ... at the junction points 12 and 13-i via the lines 4 and 6 Directly
sent as sound. Further, the reverse phase indirect sound radiated to the front side and the rear
side of the indirect sound electroacoustic transducer 3 'housed in the cabinet 24 passes through
the delaying sound wave transmission passage 16.17 and a reverberation effect is added. At the
point 12.13, it is mixed with the direct sound, passes through the sound wave transmission
passage 14 ° 15 and reaches the ear of the listener 21 through the supports 6 and 7. Similar to
the embodiment shown in FIG. 2, this embodiment can be made extremely compact by resin
molding of plastic as shown in FIG. The monaural playback / listening apparatus of the present
invention is configured as described above, and according to the present invention, the following
effects can be obtained. (1) Since the direct sound is mixed with the indirect sound to listen to
this mixed sound, the sound image can be localized outside the head and the feeling of fatigue
unique to the case of listening with an earphone or the like can be eliminated. 2. Indirect sound
can be easily obtained simply by guiding the sound waves of opposite phase emitted from the
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front and rear surfaces of the electroacoustic transducer to the sound transmission passage for
delay, respectively. The device can be made extremely compact if the three delay sound
transmission passages are formed in a spiral shape.
4. Brief description of the drawings Fig. 1 is a block diagram showing a basic configuration of the
monaural reproduction listening apparatus of the present invention, Fig. 2 is a schematic view of
one embodiment of the present invention, and Fig. 3 is a cross section of the same embodiment.
FIG. 4 is an explanatory view showing the sound wave transmission diameter 'n, J, path of the
sound wave transmission passage for delay of the embodiment, and FIG. 5 is a block showing
another basic configuration of the monaural reproduction listening apparatus of the present
invention. FIG. 6 is a schematic view of another embodiment. ········ Signal source, 2 ··· Amplifier, 3,
J ′ ···· ′ ′ Electro-acoustic transducer, 4, 5 ··· Mountain sound wave transmission passage,
6.7 ··· · support, 14.15 ----- wave transmitting passage, 16.17 ...... delay wave transmission path,
18 ...... cabinet, 19 ...... front chamber 20 .. .. rear room, 21 ..... middle listener, 22 ........ cabinet, 23,
24 ........ cabinet. Revenge JlllUTh Toshio Nakao I muscle 1 person EndPage: 3 Figure 1 Figure 3
Figure 4 bCEndPage: 4
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