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JPS5023963

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DESCRIPTION JPS5023963
? 44 original recording device O Japanese Patent Application No. 45-94917 [phase] Application
No. 45 (1970) October 28 [phase] inventor Takeo Shika Minato-cho Kawasaki city 125 Nippon
Columbia Co., Ltd. Kawasaki Office Michio Okamoto Shikizawa Shigeki Dojo Nakaya Bonmon
Dokusho 0 applicant Nippon Columbia Co., Ltd. Minato-ku, Tokyo Akasaka 4 14 14 [Facial]
Attorney Attorney Yamaguchi Kazuhide
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram for explaining a recording
apparatus for obtaining a signal to be reproduced according to the present invention, and FIG. 2
is a system diagram for explaining the reproduction apparatus.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fourdimensional three-dimensional recording apparatus, and in particular, it operates a polarity
inverter, a polarity switcher and a mixer according to the source of music to be recorded, and an
optimum reproduction state according to the source content. It is an object of the present
invention to provide a recording device capable of realizing In the past, there has been no one
that is considered to make an optimal recording according to the music source reproduced by the
listener. The present invention is a recording device for carrying out the above-mentioned object,
and the present invention will be described below with reference to the drawings. FIG. 1 is a
system diagram for explaining a recording apparatus for obtaining a signal to be reproduced
according to the present invention, showing a process of collecting a raw sound field 1 such as a
studio or a hall with a 4-channel microphone and converting it into a 2-channel. There is. The
direct sound generated from the sound source in front is the signal FL of the sound field in front
of the left and the signal of the sound field in front of the right by the two unidirectional
microphones 2 and 3 directed to approximately 45 degrees to each other [111111]. One point is
collected about FR. Similarly, the other two unidirectional microphones 4 and 5 respectively pick
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up the signal BL of the left rear sound field and the signal BR of the right rear sound one point.
The forward signals FL and FR are mixed with each other by the mixing amount m by the mixer
6, while the rear signals BL and BR are mixed with each other by the mixing amount n by the
mixing device 7, and the signal components on the left side are mixed by the mixing circuit 8,
The signal components on the right side are respectively mixed in the mixing circuit 9 and
converted into two synthesized signals and R. At this time, one of the rear signals BL and BR (in
the figure, .quadrature. Is BR) is mixed through the polarity switch 10 (the polarity switch 10
comprises, for example, the switch 10a and the polarity inverter 10), and then the polarity is
switched. Mixing is performed through the inverter 11. When it is necessary to pick up the direct
sound of the sound source from the rear with the microphones 4 and 5, the polarity switching
device 10 has a positive polarity. For example, the switching switch 10a is a contact 10. Defeat to
the side. (B) When the sound source is only forward and the rear is only indirect sound such as
reverberation, the polarity is reversed, for example, the switch 10 is turned to the side. In this
way, the two right and left signals and R obtained from the mixing circuits 8 and 9 are recorded
or conveyed by the conventional two-channel transmission device 12 such as the two-channel,
chief recorder disc record, FM stereo broadcast, and the like. The signal recorded or carried to
the two-channel transmission device 12 as described above is reproduced by, for example, the
reproduction device shown in FIG. The combined signal from the 2-channel transmission device
12 and R are applied to the wide band phase shifters 13 and 14 so that each phase is advanced
by 90 degrees; left signal (L + 90 ░) and 90 [111111] EndPage: right delayed by 1 degree A
signal (R-90 ░) is produced.
These are added together in the summing circuit 15 to obtain a 90 ░ phase-shifted and R signal
difference signal B, which is reproduced from the rear speaker 16. Also, the signals LO0 and ROo
which are not phase-shifted are reproduced from the speaker 17 and the right speaker 18
respectively, and at the same time, a part thereof is added by the summing circuit 19 to obtain a
summed signal F which is reproduced from the front speaker 20. 21 shows a reproduction sound
field. In the above recording / reproducing apparatus, the signals FL, FR, BL and BR of 4 channel
sources are reproduced as output signals F, L, B and R to the four speakers 20, 17, 16 and 18
respectively in the following composition Be done. (A) When there is a sound source forward and
backward (polarity switch 10 is positive polarity) L = FL + mFR + BL + nBR ? ? иии ? ? = (1) R =
mFL + FR?nBL?BR.
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии (2) F = ((1m) (FL-= FR), + (1 + n) (BL x BR)) 9 o-.. In the case where a sound wave generated from a sound
source at a position is directly incident on the microphones 4 and 5-two of them! Since the
electric signal waveforms of BL and BR which are out of question are correlated with each other,
the musical tone signal is extinguished or attenuated by the operation manipulation of (BL-BR) of
equation (3). According to the equations (3) and (4), the rear signal is not reproduced by the
front speaker but is reproduced by the rear speaker. Here, the phase shift of the backward signal
B by 90 degrees means that the sound image localization behind the (BL + BR) component in the
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equation (4) is unclear due to the BL and -BR acid components of the equations (1) and (2)
Because of this 90-degree phase shift, the localization of the reproduced sound image in the rear
is steady. (B) In the case where there is a sound source only in the front, and only reverberation
and other indirect sound from the rear (polar switch 10 is reverse polarity) L = FL + mFR + BLnBR ........... ... (5) R = mFL + FR-nBL + B] R ... ... (6) F = (1 + m) (FL (F 'R ) + (1-n) (BL + BR) B 90 ░ =
((1-m) (FL-FR) + (1 + n) (BL-BR)) 90 ░------(8) One-sided reverberation Is a combination of multidimensional anti-diagonal sounds from all surfaces such as walls, ceilings, floors, etc. within a
sound recording field, and this is the two single directional microphones behind When the light is
incident at 4 ░ 5, the electric output signal waveforms BL and BR are so much from the
difference in the acoustic reflection path that each has followed. Because there is almost no
correlation with each other in the amplitude, so that there is no sound source behind and the
signal picked up from the rear is reverberation (BL-BR), the subtraction operation does not hold
down and is not canceled or attenuated ( In the expression (8), the reverberation from the rear
speakers can be reproduced to give the listener a sense of presence that surrounds the body,
which is an important element in the 4-channel stereo effect.
On the other hand, direct sound from the front sound source in the rear microphones 4 and 5 is
correlated, and this is canceled by the (BL-BR) component of the equation (8). Sound from the
front leaks to the rear speaker 16 Can be prevented. As apparent from the equations (1) to (4) or
(5) to (8), in the playback sound field 21, the acoustic signals FL, FR, BL, BR of the raw sound
field 1 are applied to the four speakers. Is well blended, and a immersive, immersive threedimensional sound field can be reproduced without loss of sound between speakers. Also, in
order to maximize the sound reproduction effect according to the position of the sound source
and the position of the microphone and the acoustic conditions such as the studio or the hall, the
mixing amounts m, n (0 (m (1, 0 (n (1) You can adjust the sense of stereotactic and realism. The
playback system shown in FIG. 2 is made by distributing the sounds of individual instruments
often used in conventional stereo recordings by studio mixing, as well as the signals recorded by
the microphone arrangement of FIG. Excellent sound effects can also be obtained for channel
program sources.
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