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DESCRIPTION JPH0686379

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DESCRIPTION JPH0686379
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound recording and reproducing apparatus configured to reproduce the vibration of an eardrum
at the time of recording.
[0002]
2. Description of the Related Art A recording / reproducing system using a dummy head is
known as a system configured to reproduce the vibration of an eardrum at the time of recording.
The dummy head is a model of the human head including the auricle and the ear canal, and a
microphone is placed at the position of the tympanic membrane of this model. During
reproduction using headphones, the reproduced sound is heard through an inverse filter having
the reverse characteristic of the ear canal.
[0003]
According to this recording and reproduction system, the vibration of the eardrum at the time of
recording can be reproduced to a certain extent at the time of reproduction. However, since this
system does not directly measure the vibrational state of the tympanic membrane, it is difficult to
precisely match the tympanic membrane vibration at the time of recording and at the time of
reproduction. It can be seen that the realism of the sound and the localization of the sound are
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1
not sufficient. In particular, the localization of the sound to the front is insufficient.
[0004]
SUMMARY OF THE INVENTION According to the present invention, "If the vibration of the
eardrum is completely coincident between recording and reproduction, it is possible to hear
completely the same sound as that at recording at the time of reproduction". It is an object of the
present invention to provide a device capable of precisely reproducing the vibration of the
tympanic membrane at the time of recording on the tympanic membrane at the time of
reproduction.
[0005]
In order to achieve the above object, the sound recording and reproducing apparatus according
to the present invention comprises means for converting the vibration of the eardrum into an
electric signal and recording it, and the waveform of the electric signal recorded. Means for
measuring the difference between the vibrational waveform of the tympanic membrane when the
recorded electrical signal is reproduced as sound, and the difference between the waveform of
the electric signal and the vibrational waveform of the tympanic membrane based on the result
of the measurement And means for generating a filter having a characteristic of nulling.
[0006]
At the recording site, the vibration waveform of the eardrum is recorded as an electrical signal
using an optical fiber, a laser vibrometer, or the like.
At other places, the recorded electrical signal is reproduced as sound by headphones or the like,
and the vibration waveform of the tympanic membrane at this time is measured.
The difference between the measured vibration waveform of the tympanic membrane and the
waveform of the electrical signal applied to the headphones is measured, and a filter having a
characteristic that makes this difference zero is designed. At the time of reproduction, the
recorded electrical signal is reproduced as sound from a designed filter.
[0007]
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2
Embodiments of the present invention will be described below in detail with reference to the
drawings. FIG. 1 is a basic processing diagram, and as shown in FIG. 1, the processing of the
sound recording and reproducing apparatus of this embodiment comprises a tympanic
membrane vibration detection recording process 11, a control mechanism design process 12 and
a reproduction process 13. FIG. 2 is a block diagram of the apparatus of this embodiment, and
each process will be described with reference to the figure.
[0008]
Recording process 11: The tympanic membrane vibration detection mechanism 21 converts the
tympanic membrane vibration of the listener's ears at the recording site into an electrical signal,
and records it in the electrical signal recording / reproducing device 25.
[0009]
Control mechanism design process 12: The recorded electric signal is reproduced at another
place using the sound output device 24, and the tympanic membrane vibration detection
mechanism 21 detects the vibration of the tympanic membrane while listening to the listener.
The difference between the electric signal waveform and the tympanic membrane vibration
waveform is measured using the comparison mechanism 22, and a correction filter having a
characteristic that makes the difference between the electric signal waveform and the tympanic
membrane vibration waveform zero is designed.
[0010]
Reproduction process 13: The control mechanism 23 includes the filter designed in the abovementioned design process 12, and reproduces the electric signal reproduced by the electric
signal recording and reproducing device 25 as sound from the filter.
[0011]
By passing the control mechanism 23 in this way and converting the electric recording signal
into sound, the vibration at the time of recording is accurately reproduced on the eardrum, so
that the sound can be heard as if it were in the recording place.
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Also, once a control mechanism adapted to an individual is designed, accurate reproduction of
sound is always guaranteed as long as the individual uses the same sound recording and
reproducing apparatus.
[0012]
Next, the configurations of the tympanic membrane vibration detection mechanism, the
comparison mechanism, and the control mechanism will be respectively described with reference
to FIGS.
[0013]
The tympanic membrane vibration detection mechanism comprises an optical fiber 31 and a
laser vibrometer 32.
At the time of recording, a person without hearing impairment is seated at the recording site, and
as shown in FIG. 3, the optical fiber 31 is inserted into the ear canal near the tympanic
membrane, and the laser vibrometer 32 connected to the optical fiber 31 The vibration
waveform of the tympanic membrane is converted into an electrical signal and recorded in the
digital recorder 33.
[0014]
The comparison mechanism comprises an optical fiber 41, a laser vibrometer 42, a digital filter
designer 44, and a digital regenerator 43. When designing the correction filter, as shown in FIG.
4, the electric signal reproduced by the digital regenerator 43 is given to the headphone 45, and
the vibration of the eardrum at this time is converted into an electric signal by the laser
vibrometer 42, This is given to the digital filter designer 44. The digital filter design unit 44
detects a difference between the electric signal waveform given to the headphone 45 and the
tympanic membrane vibration waveform supplied from the laser vibrometer 42, and designs a
digital filter having a characteristic to correct this difference.
[0015]
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The control mechanism comprises a digital regenerator 51 and a digital filter 52 designed by the
above comparison mechanism. At the time of reproduction, as shown in FIG. 5, the electric signal
reproduced by the digital regenerator 51 is passed through the digital filter 52 and supplied to
the headphone 53.
[0016]
As mentioned above, although one Example of this invention was described, this invention is not
limited to this Example, For example, various embodiments, such as using a speaker instead of a
headphone, are possible.
[0017]
According to the present invention, since the vibration of the tympanic membrane at the
recording place can be precisely reproduced on the tympanic membrane at the time of
reproduction, it becomes possible to hear the sound as if it were at the recording place.
[0018]
Brief description of the drawings
[0019]
1 is an explanatory view of the process of the device of the embodiment of the present invention.
[0020]
2 is a block diagram of the apparatus of the embodiment of the present invention.
[0021]
3 is an explanatory view of the tympanic membrane vibration detection mechanism of the device
of the embodiment of the present invention.
[0022]
4 is an explanatory view of a comparison mechanism of the device of the embodiment of the
present invention.
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5
[0023]
5 is an explanatory view of a control mechanism of the apparatus of the embodiment of the
present invention.
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