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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound field correction apparatus that corrects a sound field by changing the position and
orientation of a sound source. 2. Description of the Related Art In recent years, with the
development of digital signal processing technology, digitization of audio equipment has been
rapidly advanced. Recently, it simulates natural sound fields such as various concert halls,
stadiums, stages, etc. because it can process in real time the convolution and reverberation
calculation of the initial reflection in the sound field sound. Sound field correction devices have
been commercialized. Such a sound field correction device is realized by performing digital signal
processing by means of dedicated signal processing 7 ° rotor for sound field control. Here, the
main factors that form the sound field are the arrival time of the sound wave from the sound
source and the arrival direction of the repulsive wave seen from the listener, but the sound wave
to be heard from the influence on the hearing is a direct wave, It can be divided into early
reflections and reverberations. Straight rumbling, straight propagation from the sound source
and guru sound l! 1. It is a group and comes from the sound source direction, and gives
localization of each sound source, gloss of sound, and the like. The early reflection wave is for the
direct wave from the a source direction. It has an oblique direction difference and a specific delay
time, and gives a sense of sound spread and depth. A reverberation wave is a non-directional
sound wave group that attenuates while repeatedly reflecting back and forth repeatedly under L
and around 9 left and right, and gives mood feeling, an afterglow, and the like. In the
conventional sound field correction apparatus, the above-described initial reflection wave and
reverberation wave are artificially added by signal processing. (The problem to be solved by the
invention) However, the above-mentioned sound field correction device sufficiently copes with
the correction of the actual sound field space, such as the size and shape of lφ, the sound
absorption coefficient, the obstacle, etc., of the two listeners. The current situation is that it is not
complete. For this reason, even if the time delay of the initial reflection wave that makes the size
of one room feel is extended, the feeling of expansion like a large hole can not be obtained in a
small room, so 1 '! There are cases where the listener may feel uncomfortable as if the sound is
blurred. Especially in very narrow spaces such as in a car. It is better to suppress the generation
of reflected waves. On the other hand, it is well known empirically that the listener changes the
arrangement and orientation of the sound source to create a sound field that suits the listener's
own preferences. It is difficult to change the position and orientation of the sound source at any
time, and such change of the sound source is impossible, especially when listening to music while
driving in a car. The present invention has been made in view of such a point, and the purpose
thereof is to simplify the sound field correction in which the listener can change the position and
direction of the sound source as needed without moving the listening position. It is an attempt to
provide a device.
[Means for Solving the Problems] In order to achieve the above object, according to one sound
field correction device of the present invention, first speaker mounting means provided for
moving eight along a guide rail in the left-right direction And 5) first discrimination means for
controlling the movement of the first speaker attachment means; second speaker attachment
means provided rotatably on the first speaker attachment means in the vertical direction and in
the left and right direction; (2) Second control means for controlling the rotation of each of the
loudspeaker mounting stages. "11 J 2nd speaker equipped with a speaker attached means, and
the first! And controlling the position and orientation of the spill force with respect to the listener
by the second control means. [Operation] The first speaker mounting means is moved in the
horizontal direction by the first control means, and the second speaker mounting means is
rotated in the vertical and horizontal directions by the second control means. Therefore, the
speaker attached to the second speaker attachment means is controlled in position and
orientation by the first and second control means, and the sound field for the listener is simply
corrected. [Embodiment] A sound field correction apparatus according to the present invention
will be described with reference to two drawings for one embodiment where it is applied to a
passenger car. FIG. 1 shows a schematic configuration of the sound field correction apparatus,
which is disposed behind the rear seat in the compartment of the car (A) shown in FIG. 3, that is,
on the shelf board (B) just below the rear window. . (1) is a guide rail mounted on the shelf board
(B) in the left-right direction, and the upper surface VC1 pair of protrusions (Ia), (Ib) and the rack
gear (2) positioned therebetween are in the left-right direction Provided in (3) is a speaker stand
as a first speaker attachment means, and both ridges (Ia) and (Ib) K of east direction ray / L / (1)
through cross roller guides (4a) and (4b) respectively It is supported and provided to be movable
left and right along the 5 guide rails (1). (5) is a first actuator for movement which is a motor
built in the speaker base (3), (6) is a drive gear rotated by the first actuator (5), (7) is this drive
gear ( 6) the pinion gear (7) engaged with the rack gear (2) and the speaker stand (3) on the
guide tray # (1) by engaging the rack gear (2) and activating the first actuator (5) Move
smoothly. (8) Lotus bee stand (3) A spherical body supported rotatably in the vertical and
horizontal directions via the K bearing ball (9), which serves as a second speaker mounting
means, and the speaker OQ is the ball (8) It is attached.
The sphere (8) is smoothly rotated in the vertical direction by the second actuator Qυ for
vertical rotation built in the speaker stand (3), the elevation angle of the speaker αO is
corrected, and one sphere (8 ) Is smoothly rotated in the left-right direction by the third actuator
O for left-right direction rotation, and the left-right swing angle of the speaker 00 is corrected.
Reference numeral 03 denotes a control unit attached to the speaker stand <3). As shown in FIG.
2, a control signal is sent to the control unit α3 as an operation unit a ◆ provided at the front of
the driver's seat in the vehicle compartment. Each actuator (5), α υ, together with the auxiliary
signal of the position detection sensor a5 which detects the vertical and horizontal rotational
positions of the ball (8) and the movement position of the ball base (3). α force is controlled, the
position and orientation of the speaker GO (upper and lower. Left and right) are corrected.
Incidentally, on the guide rail (1), two speakers αq for the right channel and the left channel are
supported via the sphere (8) and the speaker stand (3), respectively. FIGS. 3 to 5 show examples
of correction of the sound field applied to the passenger compartment, respectively. FIG. 3 shows
that the elevation angle of the cispy force QO is directed upward by θ by the second actuator a.
Further, a direct reflection wave from the speaker aO is applied to the sound absorbing material
at the upper part of the vehicle interior with a large amount of reflected waves to be suppressed,
thereby forming a so-called dead end sound field. Also, FIG. 4 shows the case where the listener
is one driver, and the direct waves from the left and right channel speakers αO are respectively
left and right F '! Make 7Y equidistant. The respective positions from the reference position C of
the left and right speaker stand (3) and the respective shake angles of the speaker QO are
corrected. Furthermore, FIG. 5 shows an example of correction in the case of a four-seater. In this
case, when the speaker αO is located immediately after the person in the rear seat, the sound
source is felt loud to this listener, and the waves are interrupted directly by the person in the rear
seat for other listeners. I can feel the sound. Accordingly, the position and the orientation of the
left and right speakers θG are changed so that the person in the rear seat directly intercepts the
wave. In addition, the correction of the sound field mentioned above is various methods in which
the moving position of the speaker stand (3) and the rotational position of the sphere (8) are set
in advance, in addition to the method of adjusting by the operation unit each time before taking
@. A sound field may be appropriately selected and controlled automatically. [Effect of the
Invention] The present invention is configured as described above, and exhibits the effects
described next. The speaker is attached to the first speaker attachment means provided so as to
be movable left and right along the guide rails via the second speaker attachment means which
can be turned vertically and horizontally.
Since the position and orientation of the speaker can be changed, it is possible to change the
position and orientation of the sound source or to suppress the reflected wave according to the
actual sound field space, and the sound field can be corrected simply. Meet, but without the
listener moving the listening position. The sound field can be corrected while listening, and the
sound field correction can be easily realized according to the preference of the listener or
according to the oil phase.
Brief description of the drawings
The drawings show an embodiment of the sound field correction apparatus according to the
present invention, FIG. 1 is a cut left side view, FIG. 2 is a block diagram, and FIGS. 3 to wJ 5
show sound field correction examples respectively. Is a right side view of the vehicle interior, and
FIGS. 4 and 5 are plan views, respectively.
(1) ··· Guide rail, (3) · · Speaker stand, (5) · · · First actuator, (8) · · · Sphere, 00 · · · Speaker, α force
· · · second actuator, (2) ... third actuator, C13 ... control unit.
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