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DESCRIPTION JP2015222853

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DESCRIPTION JP2015222853
The present invention provides a signal processing method and apparatus for expanding the
localization of a sound image obtained by a headphone, an earphone, or a speaker arranged in
the vicinity of each ear. SOLUTION: Sound image localization setting is performed by adding
delay time by delay means, performing frequency characteristic correction by sound image
localization setting Equalizer means, adding to the other channel, auditory sound pressure
difference frequency characteristic correction means, auditory treble band characteristic
adjustment means An output is obtained by headphone sound image localization enlargement
signal processing that is configured by the headphone device frequency characteristic correction
means and the sound pressure sensitivity matching means. [Selected figure] Figure 1
Headphone sound image localization enlargement signal processing method and apparatus
[0001]
The present invention is a signal processing method and apparatus for expanding the localization
of a sound image obtained by headphones, earphones, or speakers arranged in the vicinity of
each ear in music reproduction. In the following, “headphones, earphones or speakers arranged
in the vicinity of each ear” will be abbreviated as headphone devices.
[0002]
In the case of a normal music CD, the mixing operation is performed by monitoring by the
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speakers arranged as shown in FIG. However, when the sound source data is reproduced by a
headphone device, it is known that the sound image seems to be localized inside the head, and
the user can not perceive the spread of the sound felt when listening with the speaker.
[0003]
Therefore, much research has been conducted since ancient times, adding time difference, phase
difference or volume difference, or adding echo sound, using impulse response measurement and
analysis results to perform convolutional signal processing to obtain broadening of sound image
localization, etc. Research and suggestions are being made.
[0004]
However, there is no definitive product or established method or standard.
[0005]
JP-A-3-250900 JP-A-11-75300 JP-A-10-42397 JP Patent No. 5041308 JP-A-5-252598
[0006]
Shoji Shibata ed. "Introduction to audiovisual information" Shohodo Co., Ltd., published on July
15, 1987, the first edition, published on pages 122-131.
[0007]
The problems to be solved by the invention lie in the following two phenomena, which cause the
impossibility of perceiving the spread of the sound felt when listening with the speaker when
listening with the headphone device.
[0008]
The first problem is that in the mixing operation by the speakers at the time of recording shown
in FIG. 11, the sound from one of the speakers has a time difference (including phase difference)
and frequency characteristics generated by the shape of the head and the directivity of the ears.
The sound pressure difference is input to both ears, but when listening with the headphone
device, unnatural sound image localization occurs due to the difference that one sound is input to
only one ear. .
[0009]
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The second task is listening to the reference level of -18 dBFS at 85 Phon in the mixing
operation, while listening at 60 Phon or less at the time of reproduction with the headphone
device, and at about 40 Phon for some people, so the listening sound pressure difference A
phenomenon that the low frequency drops due to the change of auditory frequency
characteristics, the high frequency hearing sensitivity declines due to aging and the high
frequency auditory sensitivity is deteriorated, and the feeling of spread is lost. Is occurring.
[0010]
The means for solving the time difference of the first problem is based on "the arrival of plane
wave" (left figure) and "incident angle and time difference" (right graph) in Fig. 2 cited from the
description of "non-patent document 1" In the sound image localization setting delay means, a
signal to which a delay time is added using a delay with the most effective time set by trial
listening and consideration in the range of 0.2 to 0.6 mSec is added to the other channel is there.
This method is proposed as a delay circuit in "Patent Document 1" (1991).
[0011]
The means for solving the sound pressure difference having the frequency characteristic of the
first problem is described in “The sound incident angle and the interaural intensity difference”
(upper graph) in FIG. 13 cited from the description of “Non-patent Document 1”. Refer to the
created “frequency response with incident angle” (bottom graph) and give the most effective
frequency characteristics (see Figure 3) by listening and consideration.
[0012]
Alternatively, as shown in the “interaural phase difference detection threshold (threshold) graph
(lower left graph)”, the graph is separated for each element from FIG. 12 cited from the
description of “non-patent document 1”. It is not possible to perceive a clear sound image
localization with a phase difference (time difference) above about 1.3 kHz due to the rotation of
the phase generated from the relationship between the distance between the sound source and
the ear and the wavelength of the signal. In the “inter-intensity (sound pressure) difference
detection threshold (threshold)” graph (lower right graph), using the ability to perceive sound
image localization,
[0013]
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At around 1.3 kHz or less, localization at a time difference is assisted, and at around 1.3 kHz or
more, sound image localization is given by the difference in sound pressure level. This is a sound
image localization setting Equalizer means that adds a signal to which the flat characteristic (see
FIG. 4) is added to the other channel at the most effective level by trial listening and
consideration in the range of 8 dB.
In addition, the characteristic similar to these is proposed as a low pass filter of FIG. 6 in "patent
document 2" (1999), and a low pass filter of "patent document 3" (1998).
[0014]
The solution to the low-frequency range drop due to the change in auditory frequency
characteristics due to the listening sound pressure difference in the second task is that the
auditory sound has different frequency characteristics depending on the sound pressure level
(see FIG. 5). Auditory sound pressure difference frequency characteristic correction means for
applying a correction characteristic (see FIG. 6) by Equalizer and Att to a signal based on a preset
value calculated in advance from an equal loudness curve according to the level difference
between the sound pressure and the listening sound pressure at the time of reproduction It is.
This characteristic is proposed as a loudness correction means in "patent document 4" (2012).
[0015]
The second problem of aging high-range auditory sensitivity and high-range insufficiency due to
aging is the most effective by listening and considering in the 6 to 10 kHz range with reference
to hearing loss by age (see Fig. 7). It is a treble area auditory characteristic adjustment means
having a function that the listener operates by himself with a characteristic having a peak in
frequency (see FIG. 8).
In addition, this means also has a role of adjusting the high range characteristic to the individual
difference of the hearing and the preference of the sound quality.
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[0016]
The headphone device frequency characteristic correction means corrects the frequency
characteristic (see FIG. 9) of the headphone device to be listened to during reproduction in
response to the frequency characteristic of the speaker (Mixing Engineer position) to be listened
to during recording being flat. This is a means for accurately implementing the auditory sound
pressure difference frequency characteristic correction means by giving the signal an inverse
frequency characteristic (see FIG. 10) for the purpose.
A similar method is proposed as "reverse headphone response" in "Patent Document 5" (1993).
[0017]
The sound pressure sensitivity matching means applies a preset value calculated and measured
in advance to the sensitivity of the headphone, earphone or speaker and the gain of the output
amplifier to the signal or reproduction device, and the sound pressure set by the auditory sound
pressure difference frequency characteristic correction means Is a means for accurately
implementing the auditory sound pressure difference frequency characteristic correction means.
[0018]
According to the headphone sound image localization enlargement signal processing method and
apparatus of the present invention, it is possible to reproduce and listen to the sound balance
close to the musical instrument balance and sound image localization which the Mixing Engineer
at the time of recording perceived.
[0019]
As a signal processing program or application, it is to be incorporated into an apparatus having a
portable small music reproduction function.
[0020]
FIG. 14 is a block diagram showing an example of the headphone sound image localization
enlargement signal processing method and apparatus according to the present invention.
[0021]
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Industrial Applicability Incorporating the present invention as a method and apparatus for
processing a headphone sound image localization enlargement signal in stereo sound
reproduction equipment such as a headphone device, a vehicle such as a car in a narrow space,
and a seat including a speaker in a headrest. It is.
[0022]
It is a block diagram which shows the structure of the signal processing in this invention, and the
flow of signals.
It is a figure and a graph explaining the delay time of sound image localization setting Delay.
It is a graph which shows the low-pass filter characteristic of sound image localization setting
Equalizer.
It is a graph which shows the equalizer characteristic of sound image localization setting
Equalizer.
It is a graph of ISO226: 2003 equal loudness curve.
It is a graph which shows the characteristic as an example of auditory sound pressure difference
frequency characteristic amendment.
It is a graph which shows the characteristic of the hearing loss according to age.
It is a graph which shows the characteristic as an example of auditory treble band characteristic
adjustment.
It is a graph which shows the frequency characteristic as an example of a headphone device.
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It is a graph which shows the inverse characteristic as an example of headphone device
frequency characteristic modification. It is an image figure showing arrangement of a speaker
and a listener at the time of recording, and propagation of sound. It is a graph which shows the
detection threshold (threshold) of the interaural phase difference and intensity (sound pressure)
difference. It is a graph which shows the arrangement | positioning angle of a speaker, and the
intensity | strength (sound pressure) difference input to an ear. It is a block diagram as one of the
examples.
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