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JPS54151801

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DESCRIPTION JPS54151801
Description or title of the invention
Sound reproduction method by headphones
& Detailed explanation of the invention Each channel / channel value of stereo f-book signal
(stereo signal) is supplied to 2 speakers arranged on the front left and right of the listener to
render stereo sound I # playback sound field (stereo playback sound When forming a jjii) and
having the recipient receive a three-dimensional sound, the recipient is located on the vertical
bisector of the interval of the speaker of 21i1i1 arranged at the front right and left at the time of
vhJb When an in-phase signal is supplied to the two speakers, a sound image localized in the Kri
regular part is perceived when a single signal is supplied to only one of the left and right
speakers. In the case of ?, it is 9, as it is known, that it is to perceive the sound image localized
at the position of the speaker to which the signal is supplied. The receiver can perceive the
localization of the sound image only within a plane surrounded by the positions of the two
speakers disposed on the front right and the left and the position of the listener. O also can not
perceive the localization of the outside @ Kri sound image. Therefore, if the listener wants to hear
a large sense of stereo spread by listening to white, the speakers of 2- placed on the front left
and right of the listener show a large opening angle to the listener It is not uncommon to receive
4/1 as a normal condition, but in this way the front left and right sides of the listener (the two
loudspeakers arranged show a large opening angle to the listener) In the case where the hearing
is performed in nine cases, the sound image of the hemostasis of the listener is blurred and
localization is increased, and it is well known that the kernel is unnatural and unclear. Contrary
to the 04 combination, when the listener desires that the localization of the sound image in front
of the listener is # 4 as a positive one, it should be distributed to the front left and right of the
receiver. The speaker of 216i should be in such a state as to show a small opening angle to the
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listener, but in this case, of course, the listener can not obtain a small stereo range ? & ? & in
silence. In this way (in the nine stereo reproduction sound field formed by the 2 flit speakers
arranged on the front left and right of the listener, if the listener is in such a state as to have a
good frontal sound 1 # The listener can not get a small stereo bread 0 ? island, and if the
receiving province is to make a large stereo bread to be a line, the listener will have good quality.
To be able to perceive a frontal sound image, the stereo Tanizumi sound panel placed by the
7't2m speakers placed on the front left and right of the listener and 1 large stereo spread and
good front The perception of the sound image at 1111 o'clock (they can not be satisfied with the
summons to be satisfied 69, so conventionally, it is assumed that two speakers are placed near
the front left and right 68 of the listener, i 0 of the stereo width mentioned above And both Ku
prima facie satisfaction regarding the perception of the sound image of the front of that is to be
obtained was normal.
By the way, instead of performing stereo signal t-supply to the two speakers arranged on the
front left and right of the listener as described above to perform stereo playback, stereo signals
for headphones worn by the listener on both ears are used. It is also practiced to perform stereo
reproduction by supplying a stereo signal for speaker reproduction to the headphones that the
receiver 41I wears on its both ears. It is common practice for listeners to receive a stereo signal
for speaker reproduction from a speaker and receive it as a sound having a completely different
sense of three-dimensional sound or sound quality from nine o'clock (the Shioyama For example,
it is described in detail in Japanese Patent Publication No. 55-286, and it is phi). So, the
2EndPage placed on the left and right of the front and left of the Ministry of Receiving III: A
proposal to try to get a sound like 1 town and 2 sounds like when listening to the sound from 2
speakers. (See Japanese Patent Publication No. 5M-283). According to this present listener, the
listener hears the sound from the headphone device on his / her both ears, and when the receiver
11 IAs listens to the sound from the nine speakers arranged in front of the left / right #C, It is
possible to listen as a sound, but this does not fix 9 either, it supplies 11 stereo signals to two
speakers arranged at the front right and left of the listener and performs stereo reproduction by
the above-mentioned 11f1 subject Even as it is, it exists in the same state-it becomes a sum of
things. By the way, in general, for example, the voice of a singer. , Uno love-Sounds to be localized
to the right of thinking 1! 11 is most M * a in music reproduction f) h et al., The sound i #
localized in front of the listener in stereo reproduction is required to be clear, In addition, it is
possible to obtain a sufficiently large sense of stereo spread for stereo reproduction [ii], but as
described above, in the conventional stereo reproduction apparatus, the front face of the receiver
11 1 1-4 is used. It was not possible to make the sound * of the sound clear and to make the love
@ people perceive a large sense of stereo spread. According to the present invention, the abovedescribed conventional stereo reproduction iM * can not produce a sound that can be enjoyed,
and a good frontal sound image can be obtained (a large stereo range also provides a sense of p
The present invention provides a sound reproduction system by means of headphones which can
achieve such a stereo system by using headphones, and the specific contents of the present
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invention will hereinafter be described with reference to the attached drawings. -To do.
FIG. 6 is a 10-clock diagram of the 11-th embodiment of the acoustic reproduction system with
headphones according to the present invention. FIG. 6 is a 81 KOri ? conversion circuit in FIG.
1.2 is an input terminal of the signal conversion-corruptor C to which the right channel bias r
and the left channel signal t of the stereo signal for speaker reproduction are separately supplied;
6.4 is an output of the signal conversion circuit 811 O It is a lamina. Further, ? is a headphone
device, and the headphone device HAK is supplied with the output signal Or, 04 of the signal
conversion circuit 8XO described above from its input terminals 5, 6. If there are 4 real sound
sources 8m in the normal position of the recipient's ? ?, as shown in Figure 2, the sound source
8m from the sound source 8m to the sound pressure in front of the tympanic membrane of the
right ear Transmission characteristic Mr (positive [i] characteristic needle for the listener) and
transmission characteristic Mt from the sound source to the sound pressure in front of the
tympanic membrane of the left ear of the bereaved mother <the th characteristic U of the listener
M The story is almost equal to! It is configured to have a% note, a characteristic sleeve common
circuit at 7 and 8 and a unit of headphones 9j10 for an amplifier and 11.12 t1 for each ear. ?
Compensated characteristic compensation times of $ 9.10?, frequency response time of each
headphone unit 11, 12 'kRir, Pht and 9 o'clock, respectively. The filter or the convolution
integration circuit is mainly configured as one having characteristics of Further, assuming that
the digital signal conversion lo circuit 8XOri and the 2 @ speakers 8Pr and BPI arranged at the
front right and left of the listener as shown in FIG. 1, the assumed two speakers 8Pr and 8Pt and
the listening @ The sound pressure type transmission characteristics of the front of the tympanic
membrane of both ears are as for the speaker 8PrQ3P5 and the ear, the right (2) speaker apr
(spy and the left At nine o'clock, the input signal processor r, u of each channel and the output
signal of each channel, channel have a signal conversion circuit as shown in the above equation
(1), and this signal conversion circuit EiXQtIh et al. In the case where an input signal r, t
corresponding to a sound image in front of a four receiver IIm is given to the input terminal 1.2,
an input signal and an output signal of 161-are output. That is, since the sound image of% & 4: #
and the corresponding input digit r, urtS homology level signal, this is set as r = u = O, and the lr
in equation (1) is substituted with TIKO. 1) Take ? ?<(as in the case of the formula, the output
signal Or, Ot is also an input bias r). It will be Taku and Okaji C.
EndPage: 30r = OL = Ir = u = 0 .. (4. (1) Thus, a signal conversion circuit having a signal
conversion characteristic as shown in (1) ? ? if 0 is used, the front of the listener The signal of
the sound image does not change even through the signal conversion IO path 1 C, so that the
output signal of the signal conversion circuit BXO has almost the same transfer characteristics as
the listener MO front characteristic meter -U as described above. When supplied to the input
terminals 5 and 6 of the headphone device H, the listener Mq is as if the listener is listening to
the sound emitted from one speaker placed in front of @ @ M, as in the case of a net, You can
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perceive the sound of M clearly and clearly localized. First, as described above, B-, which is the
signal conversion characteristic of the signal conversion circuit mark of the above-described
nineteenth signal conversion circuit, is the two speakers 8Pr that should be arranged in front of
the listener M as described above. , And BPI arrangement, but in the determination of the
characteristics of the signal conversion characteristic ? 0, the arrangement of the two speakers
assumed is an opening angle with respect to the listener In the case of running six signals with a
signal having the signal f ? characteristic as shown in equation (1), even if ?? (B) It is obvious
that the relationship among the person who generates the ?CK signal, the output signal r, the t,
the Or, and the Ol is always as described above (which is represented by the equation (4). This is
a big # IN! Even if the signal R circuit BXO is configured assuming a speaker arrangement that
indicates a corner, the sound in front of the listener is as if the sound from the 1-1 speaker
placed on the front of the receiver 41 fM is received When M listens and listens, it is emphasized
that what the recipient perceives is four. In order to consider the next wart, the wideness of the
stereo 9 senses, the input signal d of one channel is compared with the signal R reverse circuit
8XOK having the signal conversion characteristic as shown by the equation (1) arranged 111I
Assuming that the input signal r is given only to the input terminal 1 in consideration of the
given case, the output signal Or of the signal conversion circuit axC in this case. OL is
represented by the following equation (4). (4) The relationship between the two output signals Or
and Ot is obtained from the equation (4), and the listener M receives the sound of the real sound
? ? and so on in the ratio (b) above. The sense of the spread of the stereo corresponding to the
opening angle obtained by the speaker arrangement can be received by # 4). By the way, as for
the localization of the sound image between the left and right sides in the horizontal direction,
the time difference of the binaural declination darkness is jU praise, so the machine with a ^
weight configuration of 1g number ? ? C ?C described later Therefore, the characteristics of
the circuit having the 4% property that is required is that the 11 listeners oB / A characteristics
must be simulated in a simple way!
The four characteristics of a person other than the receiver # i may be one of the average
characteristics of the general public, and may also indicate only a delay characteristic. As is
apparent from the above description, the signal f having a signal conversion characteristic as
shown by the equation (1) and the headphone device having the positive-% property of the
listener M as described above and the tiger ? as already described In the sound reproduction
method by the headphones of the present invention shown in FIG. 6, two stereo signals are
assumed to be input to the speaker reproduction stereo signal, and two teeth are supposed to be
in the configuration of the 1st conversion ? 1 ? ? C. Loudspeaker arrangement 111? The
corresponding stereo expanse is obtained, and the listener is clear like the sound from the front
Klt of the reception axis and the sound from the tiger single-speaker with regard to the 9 @ #
stop tone chopsticks It is possible to perceive a normal insult sound image, and according to the
present firing system, the set points in the above-mentioned conventional methireo reproducing
apparatus 1tK are icPsm good. Incidentally, it can be obtained by adding to [l j & custom order of
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the signal conversion circuit 8 x c shown by the above-mentioned friend (1) as follows. As shown
in FIG. 1, when two speakers 8Pr and 8Pt are disposed on the front left and right of the receiver
as shown in FIG. 1, 2w 1o speakers 8Pr and 8Pt (Dm Consider the relationship between the ear
tympanic sound pressure of both ears. In the above case, speaker 8Pr and BPI 1g are Xr.
EndPage: 4t, and the sound pressure forward of the eardrums of the listener M's ears is Or, Ot,
and the speaker 8Pr, IIPj> transfer to the sound pressure of the eardrum's front surface of both
ears to the receiver. i! Assuming that I and I characteristics are m and B as shown in the figure,
the speaker e1 of 21i1, the signal processing r and u of BPt and the sound pressure in the ear of
the ear of both ears of the receiving axis ?early sound pressure last, the relationship with Ot is
next (In the form of ??????????????????? Assuming that the signal C at the
11 homology level is supplied, and assuming that the sound pressure in the eardrum forward of
both ears of the hearing observation is also C at that time, solving equation (6) and finding X , X
=-knee-... (0). Therefore, equation (AI) to equation (1) can be obtained. In FIGS. 4 and 5, a specific
configuration example of the signal caresing circuit .alpha.C indicated by the boot-up BXQ in FIG.
26 is shown. In FIG. 4 and FIG. 5, 1.2 is a circuit having an input terminal and a% characteristic,
and both of FIG. 4 and FIG. 1) C indicated by ? is clear from FIGS. 4 and 5.
That is, the signal conversion circuit company OK (D) equation shown in FIG. 4 holds, and for the
signal conversion circuit shown in FIG. 25, (Ill) equation holds, but these (b) equations And, when
it is expressed by a determinant after llNl 1 1 and transformed into [() equation, the above @
equation is also transformed into (9 equation) as described above. The sound reproduction
method using headphones of Honjo Akira shown in Fig. 16? If the input signals Xre and u of each
of the nine channels are supplied to the input terminal 1.2 and the same signal is at the same
level, the listener / M is placed next on the plane of the listener. Listening to the sound from fi
beka and listening to the same sound as it does now, it produces as a condition. Toa, listener-?
single-pP '' 1 ', one speed! Receive Q sound from, ax '! It Mp E @ @ i place 1. In addition, an inphase 1-level signal is supplied to two speakers arranged in the front left and right ? first 1M,
and the receiver M is ???????????? If the receiver M hears a sound with a different
sound quality, the receiver becomes M when receiving a sound and uttering it. ?? ?? That is,
when the receiver 41: tM perceives the listener U's right-handed localization and the nine-tone ?
by a small amount of 2 Q 2 i 2 sounds, the 2- speaker this month 1 / e 6 is 9, Ia region has risen
due to ?, p + wl, from Spy S to frequency response? It is Naya which is 5 and VC to listen in a
row. 26 Figure 1 1 @ forward and left & human beings were equipped with that carrier device!
The frequency e characteristics of the binaural signal at the entrance of the cabinet at the time of
listening to the sound e2 from this 2 m speaker when the two speakers being driven are driven
in-phase, level, and bias The tendency of the difference 4 is one of human's binaural signals when
human beings are listening to the sound of one from its positive dBK & one speaker! The twonumber feature is shown as jIlins in a figure--a figure (--person,-in the person, the abovementioned characteristics are different in the bird area and have individual differences). The 6 o's
shown on the left are simple and easy to hear. Can be seen as things). Here, when the sound
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image of the receiving frame, the person's righteousness is formed by the 5's 5 force of 1- and
the 2's 2's (-force (less, less, ??, ?, ? In the case where the frequency custom-made difference
as shown in FIG. In other words, feel the difference in the sound quality, so it feels like the sound
reproduction method by the five tdphones of the figure 6), so that the sound image on the
resurfacing of the receiver M is also the listener If it is formed from one "" -ka "of M0 front 7
positions, and if it is Okaji, this place-!
rK feels the difference in the sound quality as shown in Fig. 6 compared to the case of perceiving
the frontal sound image formed by using the 2111 speaker for EndPage: 5i, especially the
listening / watching task. become. By the way, even when listening to the stereo signal for
speaker reproduction by using the headphones, the sound quality when the stereo signal for
speaker reproduction is reproduced by two speakers is heard as near Zf quality sound by jriJil 9
Therefore, the sound quality of the true meat sound image obtained during reproduction using
the 2 il speaker while the sound quality of the true meat sound image of the receiver M is kept in
the bright state while it is in the bright state (It would be extremely meaningful if we could get
close. The off view shows 1 kVs of the state of the localization of the front opening in relation to
the output terminal 6.4 of the signal conversion circuit country in the sound reproduction system
by the headphone shown in the third figure described above and the input terminal 5.6 of the
headphone device. Then, by inserting the sound quality correction circuits 16r and 164 having
characteristics 1 for each channel so as to compensate for the sound quality of the regular meat
fIl, the performance of the sound imaging system of the third illustrated headphone is improved.
As the tone quality correction circuits 16r and 16t generated as IIl, those having the NJ power
factor characteristic (near-equal wave number characteristic) shown in FIG. 6 are used. If the
frequency characteristics of the sound quality correction circuits 16r and 16t during the abovementioned off ail show only large undulations on the frequency axis, even if the sound quality
correction circuits 16r and 164 are inserted, Localization is kept bright JIK. FIG. 8 shows the
sound quality correction circuit 16r. Although it is a III diagram showing an example of a 16T
frequency a4I characteristic line, in the case of * mK, the relationship of the equation (1) which is
continuously interrupted is substantially satisfied even when the sound quality correction circuits
16r and 16t are used. The sound quality correction circuit 16r, 16 tl D frequency characteristics
should be set within the range. In the configuration example shown in the off, in order to
improve the sound quality of the frontal sound image, the sound quality correction circuit 1 & -Q
is added to the one with the illustrated configuration, but the frontal image 04) Jj is improved
Signal change! An example of the signal conversion circuit capable of improving the sound
quality of a regular flesh sound image can be performed with 01 circuits of 11 circuits, so FIG.
69 shows a vss footer 7). The signal conversion circuit IIxo shown in FIG. 9 is a signal conversion
circuit shown in FIG. 5 [OK, each variable adder и 17r, 17t '& provided on the input side of the
inverting input ladder of each signed adder 15r, lk. It has a different configuration.
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By taking the gains of the variable attenuators 17r and 17j as sections, the following & lt; & gt;
Therefore, the signal conversion circuit of the signal conversion circuit shown in FIG. 9 is
represented by the following equation. In the case of fi @ 17r, 171 == 1, * WC ? M, the
equations for the nine stations are (1) and four-, and the variable attenuator 17r. If it is easy to
adjust to the state of 171 ft Km, O, (the equation (71) is as follows. That is, the signal conversion
circuit 8xori shown by o 9 Iliil I, the variable reduction R units 17 r and 17 t --- section
(therefore, its insignia iI! (The relationship between the state shown by equation (1) and the state
shown by equation: changes with ?? ?, so that the signal conversion characteristic of signal
conversion l # I (1) substantially satisfies equation (1) Set the town * g * vessel 17r and 17A
range so that it will change in the range, and change the variable g decay 17r and 17j all the way
to the 111111M level. If the signal conversion circuit raises the low-pass signal component by
61,811 degrees with respect to the input signal, the improvement of the regular-grow sound IIO
sound quality is configured. Note that the circuit 14r having the characteristics of the signal
conversion circuit BXQK), 14! Is generally used to indicate the frequency aS nature to 1 so as to
attenuate the high region, so it is necessary to adjust the 4ilR town change attenuators 17r and
17j as described above. Almost no change occurs in the high frequency components in the signal.
In addition, according to the experiment of sound image localization to human positive & 1 K II,
@ @ of the orthographic sound image of the entering cabinet Listening to people-in the high
frequency of vh @ convex among the frequency characteristics of the person heavy I I & so 69,
station # IL ?It is determined that the property is changed as shown by the large ridge 9 and
that EndPage: 6 also changes in the frontal localization and is not changed. Therefore, variable
reduction J! Even if the R units 17r and 174 are variable eyebrows, localization of the frontal
sound image is not influenced. A signal conversion circuit IEI configured as shown in FIG. 3 as a
signal JR * circuit 8XO, town 11tlt 111 h 17 r, 171 k 114 N Suto (more-to improve the sound
quality of the frontal sound image has already been described in the case of the embodiment
shown nine off) See 9 as it is a reasonable way in need of a special sound quality correction
circuit 16r, t7z. FIG. 10 is a plotter diagram showing the case where the present invention
method is applied to the 4-channel stereo method according to the i-w 2-2 method, and in FIG.
The signal conversion circuit for the last two channel signals and ? and IJ3 are the signal
conversion circuit for the 0 country fa '+ Ituii 2 channel signal Kei-1 # C which is the rear 2
channel signal, and this signal conversion circuit [Of has its signal conversion characteristic
Sometimes it is as shown in equation (1).
Further, 8XOb is a signal conversion circuit for the rear two-channel signal unit and XIBK, and
the signal conversion characteristics thereof are the right and left rear of the listener (the
speaker of 211 assumed to be arranged and ? and eardrums of both ears of the listener The
transmission characteristics up to the sound pressure on the front are ? P1 right for the coarse
speaker and the 8th rise (adder and left (assuming Ql for the view of the ear) input I1 of each
channel Irb?D And the output signal of each channel last, at the threshold with otb. ? 4 is a
headphone device for 4 channels, 7.8, 22.26 is a characteristic compensation circuit, 24 and 25
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ri adders, and this headphone pocket has a real sound source in front of the listener In the case
of the transmission characteristics in the sound pressure case of the # surface of the eardrum of
the listener's ear from the sound source in the case, NF 4 etc. straight line 4% and in the case
where the actual sound source exists in the case of the listener It is assumed that the sound
source has a characteristic that is substantially equal to the transfer characteristic at the sound
pressure in front of the tympanic membrane of the ear of the listener's ear and that it is fishing.
Well, the implementation tic4 may be such that the rear two channel signal RB, IJ is added to the
adder 24 25 directly to the adder 4i, the front for a four channel with 411 m headphones as a
headphone The headphones t # 4 vh may save the adders 24 and 25-. As apparent from the
above detailed aJK explanation, in the non-inventive sound reproduction system using
headphones, when the stereo signal for the speaker live is reduced to the headphones (therefore,
the sound IIK regarding the sound in the front is 4 or the listening The sense of sum is perceived
as a sound image from the 1-speaker placed in front of the viewer, and with regard to the sense
of the spread of the stereo, it is set in the signal variation 111-path and is made to correspond to
the nine opening angle. However, in the sound reproduction system using headphones according
to the present invention, the problems as described in the conventional stereo device can be well
solved, and if the sound quality correction means is provided independently for each channel,
positive -It is possible to improve the sound quality of the frontal sound image while keeping the
localization of the sound image clear.
4 Brief description of the drawings o 1 TIIA is a flat view explaining the transfer characteristics
between 2 speakers and the listener, 21 @ l is a flat-diagram explaining the normal dIJ
characteristics of the listener, Fig. 6 And off M and 101 g are each V of the sound reproduction
system according to the Hettono of the present invention! FIG. 4 is a block diagram of a bird'seye view, FIG. 4, FIG. 5 and FIG. 9 are push-down diagrams of the signal conversion circuit, and
FIGS. 1.2, 5.6, 18, 19, 26. 27 иии Input terminal, 6 ░ 4, 6, 4 j, 20.21 иии Output terminal, 7, 8, 22, 2!
... 41 characteristic compensation circuit, 9.10 ... amplifier, H, 12 ... headphone 7: L = t, 1k, '161,
15r, lk-signed adder, 14r, 14t иии% Circuits having 4I characteristics, 16r, 16j ... sound quality
correction circuit, 17r, 17r1. -и и Variable IR decay circuit, awake ... ... listeners, 8! 0, 8xOf, 8XI) и
W No. conversion 1 path, Shin, & 4 и и и и и и и и headphone circuit, patent applicant Nippon Bm Co.,
Ltd. EndPage: 7 also 2m, +-HA ? 3121 6 6 ? figure Jl injection (To Hz)-? 9 'Figure EndPage: ?
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