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JPH02200100

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DESCRIPTION JPH02200100
[0001]
TECHNICAL FIELD The present invention relates to an apparatus for improving the sound of
video. BACKGROUND ART In general, a television is provided with a single speaker, or with a pair
of left and right speakers designed to project sound towards the viewer. The external speakers
are separated by a distance on either side of the television set. Also, a speaker may be provided
that reflects or partially reflects sound from the wall of the room to the viewer. The "Surround
sound" system has two or more pairs of speakers, one pair behind the viewer, the remaining ones
by the center monophonic channel or not, and left and right stereo signals To play. Similarly, the
dyna quad J system has two rear speakers and two front speakers, the rear speakers being
connected to the positive output of one of the speakers and the positive output of the left side of
the amplifier and The negative input is connected to the positive output on the right side of the
amplifier (providing the L-R signal) and the other speaker is connected to be connected in
reverse polarity between the same two outputs to produce the R-L signal . Both of these
approaches attempt to improve the spatial effects of video programming by adding back
channels. SUMMARY OF THE INVENTION The present invention matches an amplifier having left
and right speakers and first and second ambience (external) speakers, and right and left
channels. An acoustic projection device for a video display device is characterized. In this system,
connecting the left channel to the left speaker produces the left signal, and connecting the right
channel to the right speaker produces the right signal, the right channel and the left channel
Connecting to the ambience circuit produces an ambience channel, connecting the ambience
channel to the positive input of the first ambience speaker produces a first ambience signal such
as L-R, and the ambience channel Connecting to the negative input of the two ambience speakers
produces a second ambience signal such as R-L. The first pair of loudspeakers points forward and
directs the sound. An amplifier is connected to project from the video display device to the
viewer and produce left and right signals, respectively. The second pair of loudspeakers are
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directed forward, sideways or backwards depending on the placement of the transducers and
indirectly connected to project sound to the viewer, producing L-R and R-L signals respectively It
is done.
This acoustic projection device It can be configured as a single coupling device within or near the
video display device. In the preferred embodiment, the first pair of speakers is placed so that the
speaker producing the left signal is the left of the speaker producing the right signal, and the
second pair of speakers produces the L-R signal. The loudspeaker may be placed to the left of the
loudspeaker producing an R-L signal, these loudspeakers may be tweeters emitting sound energy
having spectral components higher in frequency than the frequency range of the bus, and the
device is further tweeter The first pair of loudspeakers includes a woofer emitting sound energy
having a spectral component of lower frequency than the component emitted by. The second pair
of speakers face along a line between 0 and 45 degrees from a plane perpendicular to the
viewing surface of the video display device. Heading forward along a line between 0 and 45 ′ ′
′ from a plane perpendicular to the viewing plane of the video display device, and most
preferably, the second pair of loudspeakers Sideways along a line between O and 45 degrees
from the viewing plane of the video display device, the amplifier also has a differential signal
channel. The present invention also provides: Features a method of producing improved sound
from a video display device, directly. Sound energy is emitted from the video display device to
the viewer through the first pair of speakers, and the first pair of left and right speakers are
energized by the left (■) and right (R) acoustic signals, respectively. And emitting sound energy
indirectly to the viewer through the second pair of speakers, and energizing the second pair of
left and right speakers with -R and R-L signals, respectively. The present invention provides a
solution to the problem of inadequate television sound reproduction. Two-channel sound
reproduction is impossible to faithfully reproduce the intended perception of the spread of the
sound image for the stereo component while maintaining the correct sense of localization on the
screen accurate for the monophonic component. is there. In a typical cinema sound system, a full
band monophonic center channel speaker system behind the center of the screen reproduces the
center screen sound information. The left and right full band speaker systems placed behind the
left and right sides of the screen reproduce the leftmost or rightmost acoustic information,
respectively, regardless of the visual coupling of the screens. In the present invention, even if the
viewer is out of the center,.
Recognize the dialogue as coming directly from the center of the video display. Unlike movie
theater systems designed to be reproduced as three forward channels, video recording formats
and broadcasts do not provide more than one high fidelity acoustic channel. Conventional
systems produce either a wide sound image with poor monophonic centering, or a narrow sound
image with monophonic information such as interactions originating from the center of the
screen. Simply combining the monophonic center channel and feeding it to the stereo speaker
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pair does not solve the problem. A very recent development of the "steering logic" surround
decoder seeks to modify the front stereo sound image by enhancing the separation of the left and
right of the front acoustic system and the generated monophonic center channel . Video images
are typically between the projection screen and the viewer for the perceived sharpness of the
perceived video, partly due to the relatively small aspect ratio of width and height at the screen
and partly Because of the desired minimum distance, it is over a relatively small field of view. The
present invention provides the viewer with a sense of localization on the screen of the dialogue,.
It makes it possible to perceive the sense of the width of the stereophonic sound image extending
beyond the width of the video display screen. Television broadcasts include on-screen
interactions (and other information) as monophonic signals that are evenly mixed into the left
and right channels for broadcast. If generated within the accepted guidelines, all stereo video
material has stereo and monophonic content that changes according to the author's intent and
the ratio of (on screen) to ambience content. The present invention allows the viewer to always
perceive dialogue and similar material as originating from the center of the viewing area,
regardless of the sitting position of the viewer, while at the same time for all ambience material
of the pond Provide a perceived sound image. When watching a movie program, the viewer
perceives a sense of space that is different from the one actually sitting, given the impression
that he is actually in an environment projected on television. That is, the present invention
produces a lively natural sound and gives the sound a spatial immersion sense. According to
another characteristic of the invention, the loudspeakers and the amplifiers can all be located in
one device, or in the television cent, or else very close to the television cent.
Connections with external elements are unnecessary except for the signal source. Alternatively,
there may be a remote speaker system used for the reproduction of bass sounds. Connections to
external components are not required except for the bus system and signal sources. Other
features and advantages of the present invention will become apparent from the following
detailed description and claims when considered in connection with the accompanying drawings.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, there
are shown a front view and a front view, respectively, of a video playback console. The video
playback console 10, eg a television console, a film screen or a computer screen, has respectively
speakers 1.2.3 and 4, eg 4 tweeters, and a speaker 5, eg a woofer. The console 10 also develops
an amplifier I2 that spans the left and right channels. Referring to FIG. 3, a block diagram
illustrating the logical configuration of the system according to the present invention is shown.
Left and right channels from the L and R stereo sources, respectively, are input to buffers 10 and
13, respectively. The buffer 10 outputs a signal to the positive input of the equalizer 14, the
subtraction circuit 16 and the addition circuit 18. The equalization 2g14 outputs a signal to the
positive input of the left speaker 1 through the main power amplification 2g20 of the left m11,
and the positive input of the speaker 1 is grounded. The buffer 13 outputs a signal to the
negative input of the equalizer 22, the subtraction circuit 16 and the addition circuit 18. The
equalizer 22 outputs a signal to the positive input of the right speaker 2 through the right main
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power amplifier 24, and the negative input of the speaker 2 is grounded. The output of the
subtraction circuit 16 is input to the equalizer 26 and the bus circuit 28. Equalizer 26 outputs
the signal to ambience power amplifier 30. The output of the power amplifier 30 is input to the
positive input of the left ambience speaker 3 and the negative input of the right ambience
speaker 4. The negative power of the speaker 3 and the positive input of the speaker 4 are
grounded. The output of summing circuit 18 is input to bus circuit 28, which energizes speaker 5
to the bus signals from the L and R channels. The bus circuit 28 has a ratio of L + R voltage to -R
voltage. This ratio is a measure of stereo-degree and is used to adjust the gain of the L + R bus
signal to maintain a perceived spectral balance constant independent of stereo-degree.
The gain is approximately equal to That is, 1 + A (IL-RI) (IL + R +) where the total amplification
amount is limited to 6 dB. The bus circuit 28 outputs a signal to the speaker 5 via the equalizer
32 and the bus power amplifier 34. The speakers 1 to 4 have, for example, a 5 cm midrange (8
Ω) tweeter and a bus range of 180 Hz to 15 KHz mounted in a closed enclosure with an internal
volume of 0.6 liters. The loudspeaker 5 has, for example, a tuning frequency of 50 to 150 Hz
with a volume of 3.3 liters and a bus band of 40 to 180 Hz, in a 15 cm housing of the type
described in U.S. Pat. No. 4,549,631. It is a woofer. The equalization operation of the device
equalizes speakers 1.2 and 5 to the required sound, determines the response of speakers 1 and 2
to δI 11, adjusts properties (eg mass and inductance), and / or / or Negative components are
added in series or in parallel to give speakers 3 and 4 a similar spectral balance value to speakers
1 and 2 to allow the spectrum of the ambience content of typical program material. The signal
levels of speakers 3 and 4 are adjusted relative to the signal levels of speakers 1 and 2 in order
to provide an adequate perception of the width of the sound image. Typically, the levels of
speakers 3 and 4 are adjusted to be 5 dB higher than the levels of speakers 1 and 2. Typically,
the adjustment adjusts the gain of the amplifier by putting noise and other test signals into the
left channel human power 12 so that the sound output from the speaker 3 is 5 dB higher than
the sound output from the speaker 1 It is done by. Electronic equalization may also be used to
improve spectral balance. The equalization circuit is similar to the main channel for typical
program material, typically with a gradual roll-off starting at 2 K I-1z and falling 3 dB at 15 K tlz
for the ambience channel. It may be for establishing. Referring again to FIGS. 1 and 2, speakers 1
and 2 are arranged to direct sound forward from the video playback device 10 to the viewer, as
indicated by the arrow 14. Preferably, these speakers direct sound in a plane perpendicular to
the viewing plane of the video player, but these speakers are defined by planes in the range of O
to 455 from the plane of the television screen Can be arranged to direct the sound within the
The speakers 3 and 4 are arranged to direct the sound to the rear of the video reproduction
device 10 as indicated by the side or arrow 16. Preferably, the sound is directed in a plane
parallel to the plane of the video screen 20, as shown in FIGS. However, the sound can be
directed in an area defined by the plane O to 45 ° with respect to the plane of the video screen
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20 or in any direction backwards. Most preferably, the loudspeakers are oriented in the plane of
0 to 45 ° rearward of the video playback device as shown in the drawings or from the condition
shown in the drawings. The loudspeaker 5 directs the sound backwards, as typically indicated by
the arrow 18. An embodiment of the pond is possible within the scope of the claims. For example,
the stereo sound 12 can be provided with a differential amplification channel that allows the user
to change the sound characteristics independently of the speakers 1 and 2. This change is always
dependent on the particular characteristics of the sound to be reproduced. For example, the gain
in any one channel may be changed, the frequencies may be equalized, and there may be time
delays between the various channels. For example, when the main monophonic sound is
broadcasted (such as a youth program), it is possible to enhance the speaker that generates the
sound directly to the viewer, and to reduce the output from the indirect speaker. it can. Indirect
speakers can also be enhanced if stereo sound is broadcast. Also included are signal processing
of songs such as Dolby decoding, compression, delay, reverberation or the Guinami Sok effect of
songs to enhance spatial sound. Speakers 3 and 4 can produce L-R and R-L signals, respectively,
by direct connection with the left and right channels of the stereo amplifier. In this example, the
positive input of speaker 3 is connected to the positive output on the left side of the amplifier,
the negative input is connected to the positive output on the right side of the amplifier (to
produce a 1, -R signal), and speaker 4 is Connected in reverse polarity between the same two
outputs to produce an R-L signal. Alternatively, in series configuration, the positive input of
speaker 3 is connected to the positive input on the left side of the amplifier, the negative input is
connected to the negative input of speaker 4 and the positive input of speaker 4 is connected to
the positive output on the right side of amplifier Be done. The spectrum of speakers 3 and 4 need
not be equal to the spectrum of speakers 1 and 2; speakers 1 and 2 and speaker 5 are standard
stereo speaker systems placed within a few meters of the television set It can also be replaced.
In addition, speakers 1 and 2 and speaker 5 can be replaced or augmented with a central (L + R)
speaker to alter the monophonic sound. スピーカ3および4は、. The video display device can
be moved from a few meters to a few meters, or a whole set of speakers. It can also be mounted
in the freestanding module (above and below) of the video display device. スピーカ3および
11は、. It can be placed several meters on either side of the video display device, or it can be
angled in an appropriate direction, including the front, to produce the required spread of the
sound image. The speakers 3 and 4 can reproduce suitable stereo signals for improved
reproduction of audio material without video connection, by appropriate changes in the function
of the circuit and the amplifier. Furthermore, if the speakers 1 to 4 are replaced by full range
speakers, the speaker 5 and its associated circuitry are not necessary. Other embodiments are
possible within the scope of the claims.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a schematic view of the video and playback console, FIG. 2 is a front view of the console
shown in FIG. 1, and FIG. 3 is an amplifier with five speakers in the video playback console
according to the invention. Is a block diagram showing a local configuration of
1 to 5: speaker 10: console 12: amplifier 13: buffer 14: equalizer 16: subtraction circuit I8:
addition circuit 20: 20・ Main power amplifier on the left side, 22: Equalizer, 24: Main power
amplifier on the right side, 26: Equalizer, 28: Pass circuit, 30: Ambience power amplifier, 32 · · · · ·
· · · · · · · · · 34 power amplifier.
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