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JPH0548492

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0548492
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of headphones in which a sound source image can usually be placed in the middle
of the head.
[0002]
2. Description of the Related Art FIG. 4 is a schematic block diagram of a stereo sound signal
reproduction apparatus disclosed in, for example, Japanese Patent Application Laid-Open No. 63215300, and a first speaker group (3a) to be placed in front and (3b) and a second speaker
group (8a) and (8b) placed behind. The fact that the principle described in this publication can be
applied to headphones can be easily analogized, so this is shown in FIG. That is, the first
microminiature speakers (3a) and (3b) are provided on the front side of the headphone, and the
second microminiature speakers (8a) and (8b) are provided on the rear side of the headphone.
Hereinafter, this will be described as an improved conventional example.
[0003]
Next, the operation will be described. First, the first micro speaker provided on the front side of
the headphone simply reproduces the stereo input signal as stereo sound, and the second micro
speaker provided on the rear side of the headphone next has the following signals: Play the
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processed stereo sound. That is, a circuit for producing several delayed signals for producing a
signal of multiple reflections, a circuit for producing an effect of causing the arrival time to be
different according to the frequency and dispersing them according to the frequency, these two
circuits The signal thus passed is given to the power amplifier, and the second speaker is driven
by the output. From the above, when you listen to music in the music hall, you can get a sense of
nearness
[0004]
Since the improved conventional headphone device is configured as described above, there is a
drawback that the shape of the headphone becomes large, and it becomes unfriendly and heavy.
In addition, there is a drawback that the apparatus becomes expensive because of digital delay
circuit for signal processing, multiple reflection sound generation circuit, and an audio processor
for dispersion of arrival time by frequency.
[0005]
SUMMARY OF THE INVENTION The present invention was made to solve the above-mentioned
problems, and the headphones provided in the ear portion are small enough to fit in the ears
usually used in the Walkman reproduction apparatus. It is an object of the present invention to
provide a so-called front-earing headphone device with a sense of reality on the premise that a
multiple reflection sound creation circuit and an audio processor for dispersion of arrival time by
frequency are unnecessary or greatly simplified. .
[0006]
SUMMARY OF THE INVENTION The realistic, front-earning headphone device according to the
present invention comprises headphones provided in the parts of both ears, and in addition to
this, the other part of the head is directly connected. An apparatus for vibrating is provided.
[0007]
With regard to the signal to be applied, the signal applied to the headphone provided in the ear
part is a signal that makes the stereo input audio signal as it is as the stereo audio output.
Also, the signal given to the device for directly vibrating the head gives a somewhat processed
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signal such as delaying the stereo input sound signal.
In principle, signal processing of multiple reflections and arrival time dispersion by frequency is
not performed at all, and even if processed, it is a circuit which is much simpler than the
processor of JP-A-63-215300.
[0008]
In the headphone device having a sense of presence according to the present invention, the
headphone has the same effect as the conventional headphone from the part of both ears, but by
itself, the sound image is formed in the head and there is no sense of presence. On the other
hand, since the left and right of the other part of the head, for example, the left part is excited,
the medium of the brain of the straight section from the excitation point to the base of the
tympanic membrane is the sound wave generated in the brain when the head is directly vibrated.
Pass through. Since this propagation time becomes the first delay time, the sense of reality can
be obtained. On the other hand, the second delay time for multiple reflection around the skull
and propagating in the medium of the brain to reach the base of the tympanic membrane is
automatically performed in the medium of the brain so as to be different for each frequency.
[0009]
[Effects of the Invention] These two delay times make it possible to obtain headphones with a
sense of presence from before. In addition, since a complicated voice processor is not necessary,
an inexpensive apparatus can be obtained.
[0010]
DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] The following will explain
one embodiment of the present invention with reference to the drawings. The sound generating
portion in FIG. 1 is composed of two parts. One is a first headphone that listens to the direct
sound from the instrument, and the other is a binaural part with conventional headphones, and
the second is a second headphone that excites the other part (left and right) of the head. It is a
skull part in the vicinity of a head shaker. Also, the stereo input sound signal is electrically
connected to the first headphone (3) and the second headphone vibrator through respective
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amplifiers for simply making the sound stereo sound. A head shaker (10) is provided in the sunk
portion in this embodiment. (11) is a band which is used to directly contact the vibrator (10) with
the skin of the head.
[0011]
Next, the internal structure of the vibrator (10) will be described with reference to FIG. The
vibrator in this embodiment has substantially the same configuration as the tweeter of the highrange speaker in a single bit, and the cone (12) has a conical shape while the shape of the cone
(12) is a conical shape. In the case of the bowl, the point near the circular plate is different. In
addition, the spring constant of the spring (13) supporting the cone is small in the case of the
tweeter, but in the case of the vibrator, it is very large. In addition, (14) is a bolt provided at the
center of the cone, and (15) is a nut, which is used for fixing by sandwiching the band (11).
[0012]
[Operation of Embodiment] The acoustic operation of the both ears is the same as that of the
conventional headphone, and the right channel input signal input to the input terminal (1a) is
amplified by the power amplifier (2a) and then the right headphone device It is emitted as a right
channel direct sound from a very small speaker (3a) disposed at the center of (9a). Similarly, the
left channel input signal is sent from the input terminal (1b) to the power amplifier (2b) and
amplified, and then emitted as a left channel direct sound from the microminiature speaker (3b)
disposed at the center of the left headphone device (9b) Ru.
[0013]
Next, the acoustic action of the head excitation portion will be described. At the same time as the
above, the right channel input signal is amplified by the power amplifier (7b) and enters the right
side exciter (10a) to generate an excitation force between the magnetic circuit core of the exciter
and the cone. The vibration causes relative vibration between the core and the cone. This relative
displacement is hereinafter referred to as displacement. The product of the spring constant of the
spring between the core and the cone and the displacement results in an excitation force applied
to the head, causing the skull to vibrate. The sound wave generated by the vibration of the skull
propagates through the brain in the skull, and even the sound wave arriving at the eardrum's
forehead is the first above mentioned linear distance between the right side excitation point and
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the right eardrum. It is delayed compared to the sound of headphones.
[0014]
On the other hand, among the sound waves generated by the vibration of the skull at the right
excitation point, some of the sound waves are multiply reflected on the inner surface of some
skulls, and the action of multiple reflection and the action of delay are added. In addition, the
propagation sound with the time difference according to the frequency is automatically
generated in the medium of the brain and vibrates the right tympanic groin from the inside of the
brain, thereby vibrating the tympanic membrane. Similar to a narrow music hall, acoustic
characteristics with a sense of presence can be obtained at the point where the sound source can
be moved forward. Also, the left channel input signal is similarly amplified by the power amplifier
(7b) and enters the left side exciter (10b) to vibrate the skull, so that the same action and
operation as in the case of the above right head vibration can be obtained .
[0015]
Next, the operation of moving the head vibrator to an arbitrary position of the band will be
described with reference to FIGS. 2 and 3 as one embodiment. While passing the bolt (14)
provided on the cone side of the center of the cone as shown in FIG. 2 through the elongated hole
(16) provided on the band (11) shown in FIG. Tighten the vibrator to the band with the nut (15)
and attach the vibrator.
[0016]
[Effects of the Embodiment] As described above, according to the present invention, in addition
to the effect of simply eliminating the sense of discomfort that the orchestra can produce in the
head by means of headphones, the effect of obtaining a higher sense of reality can be broadened.
It can respond to the request. The first headphone provided in both ears to reproduce stereo
input signal as stereo sound as it is, and the second headphone for directly vibrating the other
head are provided, and the stereo input signal is slightly delayed and processed. In this way, a
headphone device with a sense of reality can be made inexpensive.
[0017]
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Embodiment 2 In the above embodiment, the method using both the first headphone in the
binaural part and the second headphone for directly vibrating the other part of the head is
shown. In the method using only headphones, as described in the latter half of the acoustic action
of the head excitation part described above, the effect of multiple reflections and the effect of
delay are added, and the effect of the arrival time is different depending on the frequency.
Although the degree of is small, the same effect as in Example 1 is obtained.
[0018]
Third Embodiment Although the delay time of the digital delay circuit in FIG. 1 related to the
signal to the head vibrator has not been described in detail in the above embodiment, the signal
to the head vibrator is processed. The same effect can be obtained even if the delay circuit (4a,
4b) is used to make a very large delay time.
That is, the delay time automatically obtained by the medium of the brain in the skull, that is, the
propagation time of the sound wave from the excitation point to the tympanic membrane, has an
artificially added delay time and has a sense of presence similar to a wide music hall Acoustic
characteristics are obtained. .
[0019]
[Embodiment 4] In the above two embodiments, although the signal to the head vibrator is
shown as an example which is not processed so much, various delay circuits, reverberation
multiple reflections, etc. as in the prior art. The same effect can be obtained as a signal that has
passed through all of a simulation circuit, a distributed phase shifter for changing an arrival time
according to frequency, and the like.
[0020]
Fifth Embodiment The frequency characteristics of the size of the vibration of the skull and the
phase characteristics of the vibration when the skull is vibrated by the head shaker depend on
the mechanical impedance of the skull.
Therefore, if the circuit for correcting the frequency characteristic phase characteristic of the
mechanical impedance of the skull is inserted in front of the power amplifier, the sound can be
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reproduced more faithfully. The representative characteristics are determined in consideration of
variations in characteristics due to differences in response points when the excitation point is
fixed and variations in characteristics when the excitation points are different. One representative
characteristic may be used, or a plurality of representative characteristics may be determined
and used by the user.
[0021]
[Modification] Also, existing stereo headphones may be used as they are, and only head vibrators
may be purchased to use two existing power amplifier channels in each home, achieving the
purpose at very low cost. You can do it. If there is no existing power amplifier, similar
commercially available standard power amplifiers can be purchased, and a separately purchased
head vibrator or second headphone can be driven, which is excellent in economic efficiency.
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