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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus, and more particularly, to an audio apparatus provided with an appropriate
number of variable-directed speakers at a predetermined position in a sound field, mainly used
for so-called car radios and car stereos. It is also used for other sound devices. (Prior art) For
example, as is known from Japanese Utility Model Application Publication No. 55-55451, a
variable-oriented speaker is already used in an automobile, and a speaker box equipped with the
speaker capable of being raised and lowered is mounted on a package tray. It is installed in the
specified direction or installed so that it can be changed, or the one in which the speaker is fitted
in a part of the pan cage tray so that the direction of the speaker can be changed to any direction
on the plane, Various proposals have been made and used, such as those fitted so as to be able to
turn around the vertical axis. (Problems to be Solved by the Invention) However, in any case, the
change in the direction of the speaker can only be manually adjusted together with other sound
conditions such as volume and volume balance. The adjustment is no matter how complicated
and time-consuming, it is finally the case that it is decided that the particular person is difficult to
hear, hear too much, and decides that the volume balance is bad. Furthermore, adjustment for
setting a sound field that matches the number and position of the occupants is very difficult, and
can not actually be performed up to that point (means for solving the problems) In the present
invention, In order to solve the problem, an appropriate number of speakers provided with a
variable orientation mechanism at a fixed position in the sound field, a seating presence detection
sensor for detecting whether or not a person is seated at a predetermined seat in the sound field,
According to a detection signal from the presence / absence detection sensor, a control means
for automatically controlling one or more acoustic conditions such as the direction of the
speaker, the volume, the volume balance point, etc. is provided. The sound field is variously set,
for example, when a plurality of speakers are arranged around a relatively small number of seats
such as in a car. The speaker can be changed in both directions around the horizontal axis and
the vertical axis, which is advantageous in terms of both the freedom in changing the direction
and the ease of automatic control. For seating detection, pressure sensitive, heat sensitive
switches, photo sensors, etc. can be applied, and the control means is a microcomputer
conveniently, and in some cases it also serves as a microcomputer for controlling various
functions of the vehicle. You can also. If the control means is equipped with a seat-by-seat
manual input means that can respond to the occasional demand that a specific person does not
want to hear, the sound is small, or the sound is large, automatic control taking account of that is
performed. It is more convenient.
(Operation) The speaker is freely set in a desired direction by the direction changing mechanism,
and the control means is a detection signal from the seating presence / absence detection sensor,
that is, according to the number of seated persons and their positions Automatic adjustment is
made so that predetermined acoustic conditions such as points are set in advance. (Example) As
can be seen in FIGS. 2 and 3, speakers 3FL and 3FR13R11, 3RR are provided on the front, rear,
left and right of the sound field 2 which is the interior of the car 1. Each speaker 3FL, 31'R, 31?
As shown in FIG. 1, L and 3RR are fixed to the rotary shaft 6 disposed on the rotary table 5 on
the vertical axis on the base 4 and rotated relative to the base 4 on the rotary table 5. The
reorientation about the same horizontal axis 6 is performed separately or simultaneously. The
rotary table 5 is rotationally driven by the reduction gear transmission 7 from the motor Mv on
the base 4 and the rotation shaft 6 is rotated by the reduction gear transmission 8 from the
motor M) I on the rotation table 5 . Pressure-sensitive seating presence / absence detection
sensors 10FL, 10PR, 10RL, and 10RR to detect whether or not a person is seated on each of the
seats 9FL, 9FR 19RL, 9RR installed at the central portion of the sound field 2. The volume
adjustment aII for adjusting the volume of the sotL and the volume balance point on the left and
right and front and back, and each motor N 、, Ml (and each sensor l0PL, l0FI ?, l0RL, l0IIR are
the people of the microcomputer 11 as control means Wired to the output unit. In the
microcomputer 11, the seating at each seat 9FL, 9FR, 9RL, 9RR given by each sensor 10FL, 10FR,
10RL, 10RR is acoustic condition according to the situation, that is, each speaker 3FL, 3-FR, 31?
It is programmed to adjust the L, 3RR direction, volume, and volume balance point to the best. In
addition to this program, each seat 9FL, 9FR19RL, 91? In R, each push button group 12FL,
12FR112RL, 12+? Provided to make selections such as loudness and smallness that each
passenger does not want to listen individually. l? It also includes adjusting the sound
conditions in response to the signal from. For example, in the case where there are no individual
selection commands for four crew members, the speakers 3F1 1.3 FR 13RL, 3RR are directed to
the center positions of the seats shown by point Pa in FIG. 2 and adjusted so that the volume
balance point is at the same point Pa. In addition, when there is no individual selection between
the two front seats 9FL and 9FR, the occupant is adjusted to move the point Pa to the midpoint
pb of the seats 9FL and 9FR.
In short, the speakers 3FL, 3PR, 3RL, 3R1? You can enjoy 4-channel stereo sound almost equally
if the entire crew is done with the volume balance point. In addition, when a passenger ¦ crew is
one driver, the said point is moved with respect to the one person. When the driver on the
driver's seat 9FR does not want to listen, the speaker 3FR in front of the passenger is turned to
one bridge, and the sound is reflected on the windshield etc., passing over the driver's seat
passenger, and the rear seats 9RL and 9R. A) i-side, on which the acoustic conditions between the
other occupants are arranged. This makes it possible for only a specific person to hear less
without losing the 4-channel stereo effect. The same applies to the case where the rear seats
9R11 and 9RR have the same choice (Fig. 3). The sound can be increased or decreased by
adjusting the direction of the speaker's selector, or by adjusting the volume. Although the rotary
table 5, the rotary shaft 6, the reduction gear transmission 7.8, and the motor gate MH, MH
constitute a speaker orientation variable mechanism, the invention is not limited thereto, and
various mechanisms can be adopted. (Effects of the Invention) According to the present
invention, since the acoustic conditions such as the installation direction and volume of the
speaker and the volume balance point are automatically adjusted in response to the detection of
the number of persons seated in the sound field and the position, complicated operation -Of
course, the setting acoustic conditions that are optimal for the person sitting in the sound field
are obtained in the seat.
Brief description of the drawings
FIG. 1 is a schematic electric circuit diagram showing an embodiment of the present invention,
and FIGS. 2 and 3 are a plan view and a side view of an arrangement of a speaker and an
example of changing an orientation thereof in an automobile.
1------------------------------------ 2-----------------------------------------------------sound field 3FL , 3FR 13 RL, 3
RR----------------------------------------------------- Shaft 7.8-----1--Decreasing gear transmission base ν,
MH-motor 9 PL, 9 FR, 9 RL, 9 RR-------------------- ---------------Seated presence detection sensor
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