close

Вход

Забыли?

вход по аккаунту

JPS52124301

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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 JPS52124301
Description 1, title of the invention
Multichannel stereophonic sound reproduction method
31. DETAILED DESCRIPTION OF THE INVENTION This invention relates to a multichannel
stereophonic sound reproduction system and book. In the multichannel stereophonic sound
reproduction system, a plurality of speakers are arranged around the listener to obtain sound
localization in the front half plane of the listener or all around, and it is a common practice
system, For example, there is a four channel system EndPage: 1 such as CD-4 or RM format
matrix. All of these require two more power amplifiers, two speakers and a modulation / decodedecoder device compared to the conventional stereo system, and about twice as much equipment
in reproduction equipment. It is necessary, which increases the cost burden of the user, which
has been an obstacle to promoting the spread. Therefore, an object of the present invention is to
provide a multi-channel stereophonic sound reproduction system capable of cost reduction. The
multi-channel stereophonic sound reproduction system of the present invention is configured to
synthesize signals from sound sources recorded on multiple channels, converge as two
transmission channels, and obtain natural sound image localization around the entire
circumference of the listener. An O-conventional 4-channel stereophonic sound recording /
reproducing system is shown in FIG. That is, 1 to 8 microphones, 9 a mixer, 10 a technocoder, 11
a decoder, 12 to 15 speakers, and 16 a listener. The correspondence of each impulse response in
this case is shown as a second failure. That is, 17 to 19 are electric power signals, and 20 people
are listeners. θ is a rotation angle up to the center front speaker 21 or 22 of the listener 20, and
φ is a rotation angle of the speaker 23 up to a predetermined sound source. In this case, the
electric input signal 19 of the speaker 23 is A (S), and the sound pressure signals of the left ear
and the right ear of the listener 20 are APL (S) and PR (S), respectively, as shown in FIG. When
09-05-2019
1
the frequency response is determined, the listener hears the direction, distance and sound quality
of the sound source by listening to the PR (S) and PL (S). On the other hand, in order to make the
multi-channel three-dimensional sound reproducing power of the present invention recognize the
direction, distance, and sound quality of the sound source by the speaker 23 in FIG. The principle
is shown in FIG. 3 using a speaker 2.1.degree. That is, let the electric input signals 17.18 of the
speaker 21.22 in FIG. 2 be ER (S) and EL (S), respectively, and the sound pressure signal of the
right ear of the listener 20 of this music is PR ′ ′ (S And the left ear 'sound pressure signal' iPL
'(S). From this, to obtain the electric signal ER (S) -El, (S) for making the sound pressure signal
given by the equation (1) and the sound pressure signal given by the equation (2) the same (1)
Equation = (2) is obtained.
You can get this, fl. Here, in general, when the speakers 21.22 are arranged symmetrically with
respect to the listener, heLL′′heRR: he19heLR = heRL = he2 is obtained. From this, equation
(4) is は (A (S)) -------(6) is obtained. Here, the term expressed as a fraction has a phase difference
corresponding to the phase difference between the level difference numerator and the
denominator corresponding to the ratio of the absolute value of the numerator and the
denominator, respectively. The relation t-realization nine-dimensional sound reproduction system
is shown in FIG. That is, in this method, the frequency response from the one speaker to the ear
of the shaft receiver 24 from the one speaker and the ith speaker 25.26 arranged symmetrically
on the left and right of the listener 24. End page: The frequency response F1 to the tympanic
membrane of the ear farther from the force and the frequency response F2 to the tympanic
membrane of the ear closer to the speaker have characteristics of G1 = (Fl / F2) in the feedback
loop The frequency response f1 to the eardrum of the ear closer to the real sound source 28 and
the F2 area obtained G2 = fl / F2 based on the first network 27 and the frequency response from
the real sound source 28 to the ear of the listener 24 And the second network 29 to which the
output of the first network 27 is input and the frequency response from the real sound source 28
to the ear of the listener 24 that is far from the real sound source 28 Frequency response f2 to
the tympanic membrane G3 = F1 · F22 obtained from the integrated transmission characteristic
of the F1, G4 = FJ−f obtained from the integrated transmission characteristic from the F2 and
the f1, and G5 = G3 / G4 obtained from 1. A third network 30 to which the output of the second
network 29 is input; a subtraction circuit 31 for subtracting the output of the third network 30
from the output of the second network 29; Process G2 obtained from G2 = G2 = G2 obtained
from G2 = G2 obtained from G2 = G2 obtained from G1 = G2 obtained from G2 = G2 obtained
from G1 $ 32 network 32 having the characteristic of G8 = G6 / G7 obtained from G = G4-G3 6
and the output of the summing circuit 31 as an input, and the output of the subtracting circuit
31 as the first speaker 25 and the output of the fourth network 32 Means 34 for inputting data
to the speakers 2 and 6 of FIG. Next, qualitatively explaining the method of FIG. 3, the listener 24
receives and processes an arbitrary single real sound source. Two speakers 25. 1 arranged
symmetrically with respect to the listener 24. In order to realize the sound pressure level
difference between the left and right ears and the phase difference obtained by a single actual
09-05-2019
2
sound source to reproduce in j6, the relationship given by the fourth term of the equation (6)
Between the input signals of the speakers 25 and 26 and the correction of the amplitude
frequency characteristics given by the relation between the first term to the third term of the
equation (6) An example of each impulse response when the speakers 21 and 22 ° in FIG. 2 are
flat sound pressure amplitude characteristics and phase characteristics flat speakers is shown in
FIG. Fig. 5 shows an example of the level difference and phase difference between the single
input signals of the speaker 21.22 in the case where the listener is located at each vertex of an
equilateral triangle and localizes the praise in the backward 120 ° direction. Shown in.
FIG. 6 shows the case where the present invention is applied to 4-channel regeneration.
According to the present invention, according to the present invention, a predetermined natural
sound image localization can be obtained with only two speakers arranged on the left and right
of the listener, and if applied to 4-channel stereo reproduction, the reproduction apparatus
significantly costs It is possible to reduce it.
4. Brief description of the drawings Fig. 1 is a conceptual diagram of a conventional four-channel
stereophonic sound recording and reproduction system, Fig. 2 is an explanatory view of a
frequency response from an actual sound source or a speaker to the eardrum of a listener's ear, 3
shows the principle of the present invention, FIG. 4 shows the characteristic of an example of the
frequency response in FIG. 2 and FIG. 5 shows the case where predetermined sound image
localization is obtained by the conventional stereo device? FIG. 6 is a characteristic diagram of an
example of level difference and phase difference between speaker electrical input signals, and
FIG. 6 is a principle diagram of an application example of the present invention to 4-channel
regeneration. -24 ... listeners 25. 26 ... speakers 27 27 first circuit 28 28 real sound source 2? ···
Second circuit, 30 · · · Circuit 44 of the @ 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · Page 4 Fig. 4 Fig. 4 same as k (Hz) WI wave (Hz) Fig. 5 EndPage: 4
09-05-2019
3
1/--страниц
Пожаловаться на содержимое документа