JPS6218898A - Acoustic device - Google Patents

Abstract

PURPOSE:To allow persons who sit in a sound field to obtain the optimum set acoustic conditions at any time by adjusting acoustic conditions such as the directions, sound volume, sound volume balance, etc., of speakers automatically according to the number of sitting persons and their positions. CONSTITUTION:A microcomputer 11 is so programmed as to adjust acoustic conditions, i.e. directions, sound volume, and sound volume of speakers 3FL, 3FR, 3RL, and 3RR to the optimum conditions according to sitting states of respective seats which are supplied from respective sensors 10FL, 10FR, 10RL, and 10RR. For example, when there are four persons on an automobile and there is no individual selection command, the speakers 3FL, 3FR, 3RL, and 3RR are directed to the center among the four persons and the sound volume balance point is set to the center, so that all persons can enjoy four-channel stereoscopic sound almost equally.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an audio device, and more particularly, to an audio device in which a suitable number of speakers with variable orientation are provided at predetermined positions in a sound field, and mainly relates to so-called car radios and car stereos. However, it is also used in audio equipment other than automobiles.

(Prior art) A speaker whose direction is variable is, for example, disclosed in Japanese Utility Model Application Laid-open No. 55-55451.
As is known from the publication, this is already used in automobiles, and a speaker box equipped with a speaker that can be raised or lowered is installed on a package tray in a predetermined orientation or the orientation can be changed. Alternatively, various proposals have been made, such as one in which the speaker is fitted into a part of the pan cage tray so that the orientation of the speaker can be changed to any direction on a plane, and one in which the speaker is fitted in a way that allows the speaker to be rotated around the vertical axis while maintaining a constant tilt. has been used.

(Problem to be solved by the invention) However, in any of the conventional methods, changing the direction of the speaker can be
It can only be adjusted manually along with other acoustic conditions such as volume balance. No matter how the adjustment is done, it is complicated and time-consuming, and it can only be done roughly based on the judgment that a particular person has difficulty hearing, has too much hearing, or has an unbalanced volume. Moreover, it is extremely difficult to make adjustments to set a sound field that matches the number and position of the occupants, and in fact, it is impossible to do so (means for solving the problem). In order to solve the problem, an appropriate number of speakers are installed at fixed positions in the sound field with a variable orientation mechanism,
A seating presence/absence detection sensor that detects whether or not a person is sitting on a predetermined seat in the sound field, and one or more acoustic conditions such as speaker orientation, volume, volume balance point, etc. according to the detection signal from the seating/presence detection sensor. and control means for automatically controlling.

The sound field is set in various ways, such as when a plurality of speakers are arranged around a seat for a relatively small number of people, such as in an automobile.

It is advantageous for the speaker to be able to change its orientation both around the horizontal axis and around the vertical axis, both in terms of freedom in changing direction and ease of automatic control.

A variety of pressure-sensitive and heat-sensitive switches, photosensors, etc. can be used to detect whether or not the vehicle is seated, and a microcomputer is conveniently used as the control means. You can also do it. If the control means is equipped with a manual input means for each seat that can respond to the occasional requests of certain people, such as whether the sound is too low or too loud, automatic control can be performed that takes these into account. It's even more convenient.

(Function) The speakers are freely set in a desired direction by the direction change mechanism, and the control means receives a detection signal from the seating presence/absence detection sensor, that is, depending on the number of people seated and their positions, the direction of each speaker, the volume, and the volume balance. Automatically adjusts predetermined acoustic conditions such as points etc.

(Example) As shown in FIG. 2 and FIG.
11,3RR is provided. Each speaker 3FL, 3
1'R, 31? As seen in FIG. 1, L and 3RR are fixed to a rotating shaft 6 installed horizontally on the rotary table 5 around a vertical axis on the base 4, and the rotation axis on the rotary table 5 is fixed to the base 4. 6 and a cohesive orientation change around the horizontal axis are performed individually or simultaneously. The rotating table 5 is rotated by a rotating shaft 6 by a reduction gear transmission 7 from a motor Mv on the base 4.
are each rotated by a reduction gear transmission 8 from a motor M)I on a rotary table 5.

Each seat 9FL installed on the front, rear, left and right sides of the center of sound field 2,
A pressure-sensitive seating detection sensor 10 for detecting whether a person is seated on each of 9FR19RL and 9RR.
Volume adjustment a to adjust the volume of FL, 10PR, 10RL, 10RR tosohsotL and the left/right or front/back volume balance point
II, each motor Nν, Ml (and each sensor l0PL,
l0FI? , 10RL, and 10IIR are connected to the output section of the microcomputer 11 as a control means.

The microcomputer 11 includes each sensor l0FL, l
Each seat 9 given from 0FR, l0RL, l0RR
The seating at FL, 9FR, 9RL, and 9RR is adjusted depending on the acoustic conditions, that is, each speaker 3FL, 3-FR,
31? It is programmed to optimally adjust the orientation, volume, and volume balance of L and 3RR. This program also includes seats 9FL, 9FR19RL, 91? R
, the sound should be turned up loud enough that each passenger does not want to listen to it individually.
Selection push button switch groups 12FL, 12FR112RL, 12+ are provided to make a selection such as small.
? l? It also includes adjusting the acoustic conditions in response to signals from.

For example, if there are four passengers and there is no individual selection command, Figure 2 Pa
Speakers 3Fl1.
3FR13RL and 3RR are oriented and adjusted so that the volume balance point is at the same point Pa.

Further, if there are two occupants in the front seats 9FL and 9FR and there is no individual selection, the point Pa is adjusted to move to the midpoint pb between the seats 9FL and 9FR. In other words, each speaker 3FL, 3PR, 3RL, 3R1 in the center between the passengers? By pointing the vehicle and adjusting the volume balance point, the entire passenger can enjoy 4-channel stereo sound almost equally. Note that when there is only one occupant, the driver, the points are transferred to that one person.

If the passenger in the driver's seat 9FR makes a selection command that he or she does not want to listen, the speaker 3FR in front of that passenger is turned to one direction, and the sound is reflected off the windshield, etc., and is transmitted over the head of the driver's seat passenger to the rear seats 9RL and 9R. ) towards the i side, on which the acoustic conditions between other occupants are arranged. This makes it possible to make the sound less audible to only certain people without impairing the 4-channel stereo effect. This is the rear seat 9R1
The same thing happens when a person with 1.9 RR makes the same choice (Figure 3). The sound can be made louder or quieter by adjusting the direction of the speaker relative to the selector, or by adjusting the volume.

In addition, the rotating table 5, rotating shaft 6, reduction gear transmission 7.8,
The motor gates ν and MH constitute a speaker direction variable mechanism, but are not limited to this, and various mechanisms may be adopted.

(Effects of the Invention) According to the present invention, the acoustic conditions such as the speaker installation direction, volume, and volume balance point are automatically adjusted according to the detection of the number of people seated in the sound field and their positions, thereby eliminating the need for complicated operations. - The optimal setting acoustic conditions for the person seated in the sound field can be obtained at the seat without any sadness.

[Brief explanation of the drawing]

Fig. 1 is a schematic electrical circuit diagram showing one embodiment of the present invention;
3A and 3B are a plan view and a side view of the interior of an automobile showing examples of speaker arrangement and changes in direction thereof. １・−１−−−・−・−・−・−・−・・−・−・−・
・−・−−−−−1−−−−・−−1−−−−−−−Car 2−−−−−−−−−−−−−～・・−・・−・・
・−・−・−・−−−1−−−・−1−−−−・−Sound field 3FL, 3FR13RL, 3 RR−−−−−−−−
−−−−・−・Speaker 5−・・−・−−−−・−Rotating table 6−−−−−・−1−−−・Rotating shaft 7.8−−−−1・−・−・Reduction gear transmission base ν, MH-
Motor 9PL, 9FR, 9RL, 9RR----------------------・-
...-Seats 10FL, 10FR1IORL, 101i
)1---------・---------Setting presence/absence detection sensor

Claims (1)

[Scope of Claims] (1) An appropriate number of speakers provided at fixed positions in a sound field with a variable orientation mechanism, and a seating presence/absence detection sensor for detecting whether or not a person is sitting at a predetermined seat in the sound field. , A sound device (2) characterized in that it is equipped with 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. according to the detection signal from the seating detection sensor. 2. The acoustic device according to claim 1, wherein the location is a vehicle interior of an automobile. (3) The acoustic device according to claim 1 or 2, wherein the speakers are provided at the front, rear, left and right sides of the sound field. (4) According to claim 1 or 2, the speaker is variable in direction around the horizontal axis and around the vertical axis.
3. The acoustic device according to item 3 or item 3.