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JPS5223929

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DESCRIPTION JPS5223929
Representative Tadashi Matsushita d [Fa] Japanese Patent Office Opened Patent Gazette ■
Japanese Patent Application Laid-Open No. 52-239 297, 2nd 〆 <tINIM Letter 11 Title of the
Invention
Headphone device
3. Detailed Description of the Invention The present invention relates to a headphone device for
reproducing a program source such as a record or an iKi tape and listening with a headphone,
wherein the program source is listened with a speaker while listening with a doho. In the same
way, the present invention provides a headphone device in which the sound image is localized
outside the head. FIG. 5141 shows a state in which program cost such as record, il air tape etc. is
reproduced to pay for speakers in the car. In FIG. 1, 1 is a reproduction apparatus for
reproducing the program source, a is a speaker for converting left and right signals reproduced
by the reproducing apparatus 1 into sound waves; 4 is a listener; and 6.6 are ears of the listener
4 respectively. The sound waves emitted from the speakers 2 and 3 are listeners. The listener 4
listens with the ear 6.6, and the listener 4 recognizes a point outside the listener 40, for example,
a point AK image. 2 shows a state in which the same program source as in FIG. 1 is reproduced
by the reproducing apparatus 1 and listened to by the headphone 7 9, as shown in FIG. 2, when
listening by the dophone 7, the listener 4 receives The listener recognizes a point in the 40 arc,
for example the point BK sound image 711. In FIG. 2, 8.9 are left and right electroacoustic
transducers of the headphones 7 respectively. The present invention, as shown in FIG. 2,
provides a headphone device capable of recognizing a sound image outside the head of the
listener 4 similarly to the speaker listening shown in FIG. It is a thing. In the case of listening to a
speaker in the swAa emperor 10, it shows an approximate EndPage: 1-abbreviation. The nine
sounds radiated from the speaker 3 are paths of many sounds (hereinafter referred to as sound
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rays) as shown in FIG. 3, for example, the right and left ears 6 of the listening II ′ 4 through the
sound rays 11.12 and 151, It reaches 6 1 sound line 11 is a radial path in which nine sounds
reach the ear 6 ° 6 at the earliest time radiated from the speaker $, ie, a direct sound path, andsound line 12.13 is a room 1 where sound emitted from the speaker $ 'A path that is reflected by
the wall of 0 to reach the ear 6.6, that is, an indirect sound path, and this indirect sound is
delayed by the direct sound and reaches the ear 6.6, and is reflected by the wall Indirect sound
that reaches the left and right ears due to the acoustic asymmetry of the phase shift and richness
each time it is reflected is often i out of phase. Therefore, as shown in FIG. 2, in the dophone
listening, the indirect sound in the above-mentioned speaker listening is not included, so that the
sound image is localized in the head of the headphone. According to the present invention, a
signal corresponding to an indirect sound in the above-mentioned 0 point K11 l is heard
(hereinafter referred to as an indirect sound signal in a listening process (hereinafter referred to
as an indirect sound signal)), According to the present invention, there is provided a headphone
device capable of localizing a sound image outside the head and thus controlling the direction of
the nine-tone sound by means of an extremely simple external circuit.
Hereinafter, an embodiment of the present invention will be described with reference to FIG. In
FIG. 4, reference numerals 15 and 181 denote input terminals to which a stereo signal
reproduced by the reproducing apparatus is applied, 16.16 ', 16' and 1r are delay circuits, one
for one. 17 ', IF, 17' # are phase shifters, 1 lil, IIF, 18 #. 11! P is an adder 19, 19 ', 11i1 #, 19'
and also an adder, 20.20 'is an adder, 21 and 217 are resistors. In FIG. 4, the signal applied to
the input terminal 15 is divided into two at a point to become two direct sound signals, and each
direct sound signal addition 11119119 'is reached. Further, part of the direct sound signal is
branched at points b and b- and applied to the adders 19 and 19 # through the bi-grind paths 16
and 161, but the delay 1! The i-paths 1o and 1e- are fed back via the phase shifters 17 and 17
'for addition 111g and 1a * # c. As described above, the signals applied to the adders 19 and 19
′ via the delay circuits 16 and 1 e and the phase shifters 17 and 171 become a signal
corresponding to an indirect sound in the meep kerner-(indirect sound signal) And the direct
sound signal is added by an adder 19 ° 19 #. Similarly, the signal applied to the λ power
terminal 1sIK is also an indirect sound signal via the delay circuits 16 ′ and 16 ′ ′ and the
phase shifts 111T ′ and 1 ′ ′ F], and the indirect sound signal at the adders 19 ′ ′ and 19
# And the direct sound signal are added. The outputs of the adders 19 'and 19 # are added to the
other channel signals by additions @ 20 and 20.multidot. Via resistors 21.degree. 21respectively. The outputs of the adders 20 and 20 'are respectively applied to the electroacoustic
transducers 8.degree. As shown in FIG. 4, in one headphone device of the present invention, an
indirect sound signal is generated through wax, a delay circuit and a phase shifter, and this
indirect sound signal and a direct sound signal are added and applied to the headphone O)
According to the present embodiment pK, all signals corresponding to the direct sound and the
indirect sound indicated by 11 IsIQK are converted into sound and reach the left and right
10111-5.6 respectively, so the localization of the sound image or the head like the speaker
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listening And by adjusting the resistor 21 21 ', the direction of the sound image can be arbitrarily
adjusted. FIG. 6 shows another embodiment of the present invention. In FIG. 6g, the same parts
as in FIG. 4 are assigned the same reference numerals. In FIG. 6, the 22.22 'company company
resistor, 23.degree. 23' is an adder, and the signals applied to terminals 15.15 'are respectively
added through resistors 22 and 221 to an adder 33.23'. Is applied to the other channel and
applied to the adder 20.20 'as a direct sound signal.
On the other hand, the nine signals applied to the terminals 1m and 1s' are added by the adder
24, and through the indirect sound signal generation circuit consisting of the adder 18, the delay
circuit 16 and the phase shifter 17, and the visible resistor 26. It is divided into two and applied
to the phase shifters 26.26 / respectively and further added to the other channel by the adders
211.28 via the resistors 27.27 ', and the adders 20.20' as indirect sound signals. EndPage: 2 is
added to the direct sound signal and applied to the electroacoustic transducers 8 and 9 on the
left and right of the headphone 7. When the variable resistance s26 is adjusted, it is possible to
change the sound image from inside the head to outside the head or vice versa. As described
above, in the present invention, an indirect sound signal is generated by an electric circuit, and
the indirect sound signal and the direct sound signal are added to another channel via a resistor.
According to the present invention, a sound image is displayed It has the advantage of being able
to be localized outside the head and to be able to change the direction of the nine-tone point by
adjusting the resistor. Conventional left table. There is a dophone device to add each direct sound
signal on the right to another channel via a delay circuit, but in this, an indirect sound signal is
added and displayed in the dophone device, so the sound image is not localized outside the head .
The present invention has the advantage that the direction of the sound image can be controlled
in any direction by adding the indirect sound signal to the direct sound signal and adding both
signals to the other channel via the resistor and adjusting only the resistor. It is a thing.
4. Brief description of the drawings. FIG. 1 is a schematic view showing a speaker listening state,
FIG. 2 is a schematic view showing a headphone listening state, FIG. 3 is a view showing a sound
path in the speaker listening, and FIG. FIG. 6 is a block diagram of a headphone device according
to an embodiment of the present invention, and FIG. 6 is a block diagram of another embodiment.
4 ......... listener, 5, 6, - ....... ear, to 7 ........., Dohon, 8, 9 ...... ··· Electro-acoustic transducers, 16 ° 16
′, 16 ′, 16 #... .. Delay circuits 17, 1 I, '17 #, 17 #. Phase shifters 18, 18 ', 18 #. 18P, 19, 191,
19 #, 19 ", 20, 20 #---------Adder, 21.21--22.22 ', 2 sets, 27I ..... Resistor. Name of agent Attorney
Nakao, et al. 1 person Fig. 1 Fig. 2 Fig. 3 Fig. 4 End Page: 3 Fig. 4 Fig. 6 Inventor other than
above address and address same office address (2) agent End Page: 4
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