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Detailed description (no change in the content) Description 1, the title of the invention
Voice system equipment and format
6. The present invention relates to a voice system, and in particular to the problem of multichannel systems using two trunk release prints' which are equipped with two or more playbank
channels and are compatible with deer Relate to movie formant, voice sisteno. Prior art multichannel cine-voice systems, to increase realism, and dramatic or special effects, go back to at
least the n7 m 1930 movie [Fantasia j'K] using discrete optical trunks for each channel.
Subsequently, multitrack magnetic soundtracks were used to provide six or more discrete
channels, with the introduction of widescreen processing such as cinemascopes and cineramas.
In recent years, multi-channel magnetic print has been used in "Tommy" and "Pink Floyd" movies,
with two speakers in the back corner of the theater and two EndPages: three or three speakers in
front of the theater disease (fi, center, right Multi-directional speech is obtained. In the past,
discrete audio tracks were generally used for each channel in multiple channels / stems.
Although compatible stereo acousto-optic soundtracks have become popular in recent years,
most multi-channel systems use more than one channel, and generally use magnetic tracks,
making them suitable for projection and audio equipment. Because of the extra cost, there are
only a few theaters that can be regenerated, so standard optical prints have also been used in
many theater shows. In addition to the problem of the limited number of theaters with facilities
for magnetic printing, the cost of producing magnetic printing is much higher than that of optical
printing, thus the range over which magnetic printing is used is even more limited. A fully
equipped theater that handles multi-channel printing generally uses selected nfC low quality side
channel speakers or rear (environmental) channel speakers to minimize fidelity rather than cost
overall. While recent magnetic multichannel applications have been used, this approach also has
drawbacks for several reasons. Cost points. The seat in the back corner of the theater is loosely
listening to the left back or right back voice only. The theater is acoustically designed so that the
sound travels backwards from the screen (-in front of the cushioned seat and also on the collar
absorbed by the audience) and the source of the air in the air behind it is Give extra Slanophoe 7
one by reflection from the back of a smooth and hard seat.
And that the large loudspeaker enclosure at the back of the theater has problems from an
aesthetic point of view. In order to avoid the problems of cost and compatibility of the magnetic
flint, multi-tra / o optical printing is considered. But two or more optical soundtracks to movie
film? In particular, the following disadvantages occur. More complicated and expensive optical
devices for reproduction and pickup cells. Deterioration of the signal-to-noise ratio by narrowing
the track and increasing the overall guard band area Print tolerance issues from narrow tracks
and / or card bands. Phase-dynamic boundary noise increases. Having compatibility problems
when all tracks are scanned simultaneously and single tone playback is done. The increased cost
of gray bank electronics. Increase the cost of the optical recorder. U.S. Patent Application Serial
No. 603,670, with an A. Berco Hinono and Kenneth J. Country, of August 118, 1975, K. Kenneth
J. Country, U.S. Pat. , Two systems have been disclosed that provide three forward channel
regenerations (left, center, right) using all two Tranokh "1" nonons. In the Berkovitzo et al.
Application, the L, C and R signals are encoded into dual audio tracks and a portion of the C
signal is summed with the fiL and R signals. At the time of playback, each i-rank is sent to a
speaker with L or と and an adder network, and the adder network drives the C speaker with a
small amount of noise compared to the speakers of L and R. Due to the delay circuit in the supply
circuit to the R and L speakers, the center channel information would seem to originate from the
C speaker while faking it off while the stereophonic sound effects from the R and L speakers are
maintained. The Doleby et al. Application discloses a 7 'and 1 bath stem from C and R which are
used with a source of 2 channels. In one embodiment, an apparatus is provided for delaying the
left and right channel pre-clock signals relative to the central channel. However, their appearance
does not point back to the unique problem of channel voice communication. In order to
overcome all these problems in the prior art, the present invention provides a stereophonic
forward audio channel together with at least one secondary audio channel along with a rear
environment audio channel. Direct multi-channel cinematic audio formant encoded into.
The invention's EndPage: 4 ermat sealing glint is simply a conventional monophonic
cinematographic projection device and stereophonic as the stereo variable area optical sound
track format is increasingly used in the industry while providing complete compatibility. It can be
used not only in theaters with audio systems, but also in theaters using stereo playback
equipment and equipment according to the invention. In the preferred embodiment, a single
environment width 11) voice channel is provided in addition to the left front and right front
(King) voice channels. The environmental channel preferably drives all two or more multiple
environmental speakers located along the rear wall and the rear portion of the side wall of the
theater. Because this arrangement distributes the sound source over a wide area, Slanoff echo it
reduction L, and the volume of the speaker is relatively low, and the sound of a given
environmental speaker) is close to that environmental speaker. People who sit will not be
stronger than other sounds. By placing a relatively directional environmental speaker at a high
point on the side wall of the theater so that the direct sound field (with a relatively high
frequency) on the other side of the theater spectator phase kills the proximity effect Sound
localization can be improved. A serious problem that occurs when encoding into the main voice
channel of environmental channel metallurgy, that is, in all non-discrete multi-channel voice
seven stems, the decoded signal is subject to crosstalk due to the encoding process. Overcoming.
It is not a problem to introduce environmental channel information into the Wang channel, but
the cross talk of the Subbrian forward channel in the environmental channel is not very desirable
because of the effect. When two physically separated sound sources generate substantially the
same sound, the apparent direction of the sound source perceived by the listener is the listener's
direction, whether one is n or both are left. It depends on the strength in the ear and the relative
arrival time. If the time is the same and the strengths are equal, the sound source is felt to be
between the two physical sound sources. If one source is delayed and its arrival to the listener is
5 to 65 ms later than the other source, it sounds like it only came from the undelayed source.
With a delay of 35 to 50 milliseconds, the second sound is perceived, but it sounds as if it came
from a non-delayed source. For long delays in a low reverberation room, the listener hears an
Thus, crosstalk in the forward channel at the environmental speaker gives a disappointing
impression that the voice in the forward channel is coming from behind the theater audience.
The opposite situation of environmental crosstalk into the forward channel is less of a concern.
Because the audience sits close to the environmental speaker, so the environmental sound
generated by the environmental speaker is Wang Chai, and the Russian power reaches the
audience earlier. Also, when the film is manufactured to fit if the environmental speaker is not
used in a theater, it is common for environmental channel information to be intentionally mixed
into the front channel. In order to overcome the above-mentioned problem of the crosstalk of
Wang channel to the environmental channel speaker (in the present invention, the environmental
channel regenerator is provided with a time delay device. The delay time is selected to be
approximately 7596 in length from the front to the back of a particular theater audience. Such a
delay time is typically in the range of about 25 to 120 milliseconds, since the speed of sound is
about 60 subseconds per millisecond. The quality of the environment channel playback chain is
as high as the Wang channel, as the information carried in the environment channel tends to be a
steady state background sound and / or reverberation signal simulating spatial magnitude,
usually by its nature There is no need. Thus, the degradation of the environmental channel signal
by the delay device and the low quality speaker does not substantially affect the sound effect in
practical use. On the other hand, king channel signal information often includes substantial
transient content, such as human voice, which requires good fidelity, particularly for realistic
reproduction. In the present invention, crosstalk perceived by the audience is excluded from the
back channel, and the king channel signal, in particular, the highly transient content that is
desirable to be perceived as reproduced by a high quality king channel playback chain, etc. By
stabilizing the signal, the fidelity of the king channel is actually enhanced. The bass frequencies
are not well separated EndPage: 5 by typical single band matrix coding and decoding systems.
Thus, a corresponding bass crosstalk occurs between the king channel and the environment
channel. Because the bass frequency is essentially non-directional and the effect is that the whole
audience perceives the bass almost uniformly throughout the theater, the result is that it is
acceptable t'L is there. Hereinafter, preferred embodiments of the present invention will be
described with reference to the drawings. In FIG. 1, the recording portion of the present
invention is illustrated in connection with a movie sound system.
For example, a device for encoding two or more speech signals such as a conventional matrix
encoder (2) into two channels comprises a pair of two main speech channel signals, LF (front left)
and RF (front right). , And at the other pair of inputs, i.sub.LB (left rear) and RB (right rear), of the
secondary voice channel human resources i LB (left rear) and RB (right rear). The matrix coder
may be any of a number of four-tone coders known to those skilled in the art, such as SQ or Q, S,
for example. The LF and other symbols are commonly used in conjunction with such an encoder
in a four-tone speech system, the inputs LF and RF of the matrix encoder (2) being received from
the 6.2 logic circuit (3) The discrete LFC (center) and RF signals are applied to the 3: 2 logic
circuit (6). The logic circuit (6) may be of the type disclosed in the application of Belkopino et al.
The main audio channel stereo signals LF and RF, derived from a discrete multi-trunk master (not
shown), are voice dialogs to be reproduced by speakers located behind or adjacent to the theater
screen. And other transient rich information carrying. The secondary channel input signal is the
so-called echo that carries the content, which is usually slowly varying low-level background and
reverberation information, to be reproduced by environmental speakers placed behind and
behind the theater audience. It is a signal. Discrete subchannel signals can be applied to the LB
large input and RB human power of the matrix coder C, but it has been found that it is sufficient
to use a single signal for the environmental speakers and so the same signal Is applied to the
power of two people. The secondary audio channel input signal or environmental input signal is
also derived from the discrete multitrack master and processed before being applied to the
encoder (2). Since the encoder is not very effective at high frequencies, the signal is applied to a
low pass filter (4) having an upper frequency limit, for example at about 7 kilohertz, and
crosstalk of high frequency components into the environment channel as a result of azimuth
error. Reduce Following the filter (4) 2 a noise reduction encoder (6) (matched with the decoder
of the playback circuit) is preferably of the type known to those skilled in the art as a P-type
striker, Further processing is provided before the signal is applied to the LB and BB encoder
inputs. Noise reduction in the secondary or environmental channel is particularly desirable
because random phase noise on the film tends to be more prevalent in the recovery of the
environmental channel.
The encoded f'L output of the encoder (2) on the two lines LT (left track) and RT (right track) is
applied to a conventional sound track recorder. Although the present invention takes all into
consideration that the recording medium is a stereopyramidal variable area optical system as a
king, the present invention can also be used in connection with other types of recording medium
having two trajectories. In the playbank system of FIG. 2, a conventional soundtrack to laypack
device (1o) reads the encoded trunk and provides all the LT and RT signals to the matrix decoder
(12). The decoder (12) matches the encoder (2) to provide the outputs of LF, RF, LB and RB. The
LF and RF king channel outputs may be applied directly to the respective channels C of
conventional playbank electronics 2 and speakers (not shown), or alternatively as shown. Even if
applied to the type 2: 6 logic circuit (14) in the application of Berkopitzo et al., The nuclear logic
circuit derives the central channel signal cB 'and applies it to the gray back electronics and the
loudspeaker (not shown). Good. The 2: 6 logic circuit (14) may also be placed in front of the
decoder (12). If desired, the disclosure of the aforementioned Dolby et al. Or Berco Pitno et al.
Application may be utilized with respect to the LF, CF and RF signals in the Record and BackPage
devices. The combiner (16) receives the LB and RB decoder outputs, adds them together and
applies them to the low pass filter (18). The low pass filter (18) preferably has an upper
frequency limit at approximately the same frequency as the filter (4) of FIG. The signal may be
high pass (22) with a lower frequency limit of 80 hertz to prevent high energy, low frequency
artifacts from knaking the environmental speakers. ? A delay unit (22) delays the time signal of
the order of 15 strikes of the path length from the front to the back of the theater seat used by
the system. In practice, a delay on the order of 25 to 120 ms may be desired, depending on the
size of the audience seat. This large delay is possible with many different devices within the
scope of current technology. High pass filter C 20) ff: after the decoder (24) so that the input to
the decoder (24) is more complementary with the signal applied to the encoder (6) (FIG. 1) It is
also good. Such an arrangement of filters (20) also tends to eliminate noise introduced by the
delay line (22).
A low pass filter (18) may also be placed at the decoder (24,...). A noise reduction decoder
matching the encoder (6) of FIG. 1 follows the delay line (22). In the next phase, the output drives
all the electronic devices and environmental speakers. In practice, the standard environment
audio 100% level is set to 13 dB relative to 100% on the shim). The Dolby B striker level is set at
50% on film. In non-movie applications of the invention, the delay line (22) is adjusted to fit the
size of the room. In the case of a domestic four-tone speech system, the invention can be adapted
to intangible rooms with a fixed delay on the order of 12 to 60 milliseconds.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a recording portion of a
system embodying the present invention, and FIG. 2 matrix encoder 632 logic circuit 4 low pass
filter 18 low pass filter 6 Dolby B type encoder 20 high pass filter 8 sound-h rank recording
device 22 delay device 1D sound track フ バ イ バ ス 装置 device 24 Dolby B type decoder 12
matrix Decoder LF left front 142: 3 logic circuit C central 16 couplers RF right front patent
application attorney patent attorney attorney Yukio Yamazaki FIG, l. FIG., 2 ° EndPage: 7
Procedure Amendment (Formula) November 16, 1977, Display of the Patent Office Secretary 1
° Case, Showa 53 Patent Application No. 125 215 2, Title of the Invention 2, Name of the
Invention Device and Format 3, Relationship to the Case with Amendment Applicant-EndPage: 8
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