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J specification 1, title of the invention
3. Detailed Description of the Invention The present invention relates to the improvement of the
4 "f-yannel pinaural system. Fig. 1-1" shows the basics of the system to the conventional pinola,
Reference numeral 1 is a dummy head (human head-model), 2s3 are microphones located at the
left and right ears of the dummy head 1, and the pinaural signals obtained by them are
respectively independent of the listener 7 by the headphone 6 via the amplifier 495. Played in
both ears. -In this case, the dummy head is identical to the listener 7, or there are one
microphone and one microphone for both ears of the listener 7, and only when the
characteristics of the microphone, amplifier, headphone, etc. are sufficiently good. The listener 7
hears a sound that is completely the same as that at the position of the dummy head 1, and good
sound image localization around the entire circumference can be obtained. Here, when using a
microphone with a microphone inserted in both ears of the listener 7 as a dummy head, the
listener 7 can not simultaneously perform the fact that it is a single head to Dami and a listener
of headphones. Needless to say, a recording / reproducing device is used in the middle of the
transmission system. EndPage: 1 However, if you broadcast a signal or record as a record, you
will be able to provide a large number of listeners with different acoustic characteristics as a
dummy head. In this case, microphones are inserted into the ears of a specific individual, dummy
heads similar to them, or dummy heads made one on the average size of a general human being,
etc. are different acoustically. It is impossible for many listeners with characteristics to have the
same characteristics as the above dummy head. In such a case, listeners who happen to have
similar acoustic characteristics under the dummy hera may get natural sound image localization
all around, but many listeners all around except the front. The sound image is almost well
localized, but the sound image in front is very unnatural as it is localized above, behind or in the
head. -Therefor, this applicant and two applicants filed separate patent applications on the same
day. A characteristic compensation circuit 8I9 as shown in FIG. 2 is provided in each of the left
and right signal systems of the pedal phone 6 so that the frontal sound image on both ears of the
listener 7 becomes equal to that when the sound source is on the front of the listener. Proposed a
panaural system. According to this, it is possible to obtain clear frontal sound image localization
\... Depending on the listener, it may sound that the later sound image is folded forward and
sound image localization can be made only 180 degrees ahead. There was a fear that there was
The present invention provides a 4-f-Yannel pinaural system which eliminates the abovementioned problems or the above-mentioned conventional drawbacks. Fig. 3 is a view showing
an embodiment of the present invention. Reference numeral 17 is a sound recording device on 4
channels, and 10 is a front sound. A dummy head 11 v 12 is a microphone located at both ears of
the dummy head 10, a shield plate 13, a dummy head 14 for picking up a rear sound, and a
microphone 15 s 16 located at the dummy head 140 both ears The channel sound recording
device 17 'is configured. With this four-channel sound field recording apparatus 17, the sound in
front is mainly obtained as an output of the microphone 11112 and the sound in rear is mainly
obtained as a microphone 15 + 16.0 output as a binaural signal with front and back
distinguished. Reference numerals 18 to 21 denote characteristic compensation circuits which
are the main part of the present invention. 22g 23 is an adder, 24 2 and 5 are amplifiers, 26
headsphones, 27 is a listener, and these are connected as shown in the figure. Now, if there is a
sound source in front of the 4-channel sound field recording device 17, ? that output signal can
be obtained at the microphone 11't12, but there is almost no output generated by the shielding
plate 13 in the microphone 15916. Ignoring, the outputs of the microphones 11112 are each
independently a characteristic compensation circuit "18. * 2L, applied to the both ears 1 of the
listener 27 by the headphone 26 through the enhancer 22t23 and the amplifier 24 + 2.5, and the
characteristic compensation-path 18 + 21 is the front of the eardrum of the listener's both ears
The characteristic of the sound pressure is made adjustable to be equal to the case where the
sound source is in front of the listener 27. Similarly, when there is a sound source right after the
4-channel sound field recording apparatus 17, the output signal is obtained from the microphone
15216, and almost no output is generated by the shielding plate 1-3 in the microphone 1jt12, so
this is ignored , And the outputs of the microphones 15g16 are independent of one another, and
the characteristic compensation circuits 19 and 20. The characteristic compensation circuit
19t20 is applied to the front of the tympanic membrane of the listener's ears via the adder
22v23 and the amplifier 249.25 and is given to the listener's 27 ears by the headphone 26. Is
made equal to the case where the sound source is directly behind the listener 27. According to
the experiment, for the localization of the sound image in the horizontal plane (direction
judgment not considering front / back judgment), the absolute transfer characteristic from the
sound source of the listener individual to both ears is almost a hiccup relation, and transmission
between both ears Relative characteristics of the characteristics (different transmission
characteristics), especially for sound image localization in the O median plane (in front of the
listener, directly above, immediately after, including EndPage: 2) the time difference is heavy The absolute transfer characteristics from the individual sound source of the listener to both ears
are important, especially to obtain frontal sound image localization.
Although it is necessary to adjust the transfer characteristics of the listener individual with great
accuracy, the accuracy is not necessary so much to obtain the sound image localization behind. It
turned out that. Therefore, with the configuration as in the present invention, the sound image of
the front of and immediately after the important transfer characteristic of the absolute transfer
characteristic will be different by the characteristic compensation circuit, such as when there is
the sound source in front of the listener or right behind. A sound image localization with a clear
front and after a true degree can be obtained, and the necessary binoculars can be obtained by
using a general human head j size as a dummy head of the 4-channel sound field recording
device 17. The time difference between the two can be collected sufficiently, and sound image
localization in the horizontal plane, in particular, clear lateral sound image localization can also
be obtained. Furthermore, since the individual characteristics of the listeners can be obtained
forward and backward, clear sound image localization can be obtained even for sound images
diagonally forward and backward, and all the listeners It will be possible to judge after QJ. The
characteristic compensation circuit used in the present invention is realized by a graph 6, an
equalizer constructed with one or more frequency band filters such as an equalizer, or a 0-fold
integration circuit as shown in FIG. In FIG. 1-4, IN is a manual leakage and d1 to dn-1 are delay
circuits, and the delay time and the number are determined according to the target
characteristics. Since VR1 to VRn have gains of 0 to 1, they are gain adjusters, and are adjusted
corresponding to the values of each time of the impulse response waveform to be indicated by
this characteristic compensation circuit. ADD is an adder circuit that adds the polarity of the
response of the impulse response waveform that responds, depending on whether it is positive or
negative, positive if it is positive, or negative if it is negative. OUT is the characteristic
compensation circuit It is an output terminal. Besides, the 4-channel sound field recording device
picks up with a microphone set up in the vicinity of the pole of the sound source in addition to
the one shown in Fig. 3 and arranges the sound source at the position where desired sound
image localization is desired. In the case of these four-channel sound field recording devices, a
signal obtained through a circuit approximately equal to the transfer characteristic from the
sound source to the output of the microphone may be used. Furthermore, the sound field
reproduced by using general monaural or multi-channel stereo with two or more channels by
using a slicker is regarded as the original sound field of the present invention. Think of each
speaker as a sound source, and place this 4-channel sound field recording device at the position
of the listener; about the transfer characteristics from the human power of each speaker at the
time to the 4 outputs of the 4-channel sound field recording device What is also called a
reproduction sound field simulation circuit of equal characteristics is prepared, and a signal for a
speaker is added to this circuit first power, and four outputs are shown in the 13 ░ channel
sound field recording device shown in FIG. If you connect instead and listen, you can listen to the
headphones, but regardless of the individual differences in the acoustic characteristics of the
listener, monaural, 7.
??????????? You can obtain the same sound image localization as when listening to
speakers, speakers, and speakers. Although the example of the headphone was shown as a
listener. ????????????? -Also, when using a 4-channel headphone with four
headphone units, the headphone itself is an acoustic adder, so the adders 22 + 23 shown in Fig. 3
are not necessary, so please see Fig. 5? It should be configured to Here, the reference numerals
17 to 21.24 to 27 are the same as those shown in FIG. 3, and 2By 2.9 is an amplifier, and the
output ends of these amplifiers are all right and left behind all the radphones 26. It is connected
to the headphone unit. ! The connection between the characteristic compensation circuit and the
amplifier in FIGS. Any order may be used, or some combination of amplifiers and characteristic
compensation circuits may be combined to obtain desired characteristics as a whole. In addition,
accuracy is required for the characteristic compensation circuit 18921 for the front sound image,
but the characteristic compensation circuit 19 + 20 vc for the sound image immediately after is
required with a 4-channel sound field recording device since the accuracy is not required. The
compensation circuit 192 EndPage: 320 can be omitted if the signal of the sound image
immediately after being processed is close to the characteristics of a general human being. The
present invention, as is apparent from one or more of the descriptions, is equivalent to a 4channel signal picked up by a 4-channel sound field recording apparatus capable of picking up
the left, right, and left and right front sounds, or equivalent. Listening to the signal with
earphones or headphones With the Surpanaural system, the signal of the sound image in front of
the dummy head is to the listener's both ears. The signal of the sound image right behind the
dummy head is on both ears of the listener, so that the sound source of the sound just behind the
dummy head is on the back of the listener. Since the characteristic compensation circuit which
adjusts the characteristics so as to become equal to the case and is violated is provided in the
signal circuit of the earphone or the headphone, in the binolaural system, how to listen to the
individual's acoustic characteristics of the listener (sound image It has the feature that it is
possible to eliminate the difference ? in the localization) and enable the localization of the sound
around the whole circumference clearly for any listener. Fig. 1 shows an example of a
conventional pinaural system, Fig. 2 shows an example of a binaural system filed separately on
the same day by the same applicant as the present applicant, and fang 3 is the 4 channel of this
invention FIG. 4 shows an example of a no-pinaural system, FIG. 4 shows an example of the
configuration of a characteristic compensation circuit used in the present invention, and FIG. 5
shows another embodiment of the present invention.
10 x 14 и и и Dummy head, 11112, + 5916-microphone, 17 и и и 4 channel sound field recording
device, 18-21 и и и characteristic compensation circuit, 22 + 2 3 и и и adder, 24 + 25. 28 + 29 и и и?
Amplifier, 26 ? ? ? Hera (Don, 27 ... listener. -IN; input terminals of .. characteristic
compensating circuit, OTJ'T иии times deca one terminal, d1~dn- + иии characteristic compensating
circuit delay circuit constituting the, VRj~VRn иии same gain Cape Adjuster, ADD ... same addition
circuit. Fig. 2 Fig. 4 furnace Fig. 1 T 1 Fig. 5 End Page: ?
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