JPS6335204A - Speaker built-in seat of car - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a speaker built into a car seat that emits sound based on a signal from an audio device inside the car.

[Prior art]

Conventional car seat built-in speakers, for example,
As disclosed in Japanese Patent No. 0-70356, a speaker, which is a sounding body, is provided on the headrest of the seat, and a good acoustic effect is obtained by emitting sound near the ears of the seated person.

However, when the volume emitted by a speaker is constant, the distance between the speaker and the ear is close, so even a slight movement of the head causes the volume perceived by the ear to change significantly. Nevertheless, in the above system, the volume emitted by the speaker always remains at a constant level set in the audio equipment. Therefore, the good sound effects intended by the built-in speakers in car seats can only be obtained when the seated person's head is fixed in a fixed position, and if the head is moved even slightly, the volume will change or the left and right volume balance will change. It had the disadvantage that it changed greatly and caused a very strange feeling.

[Purpose of the invention]

The present invention has been made in consideration of the above-mentioned conventional problems, and provides an automobile that can always provide good acoustic effects with appropriate volume and volume balance even if the position of the seated person's head moves. The purpose is to provide a seat built-in speaker.

[Structure of the invention]

In order to achieve the above object, the present invention provides a built-in speaker for a car seat that detects the position of the head of a seated person in a car seat built-in speaker that emits sound based on a signal from an audio device. a position detection means, a control means for determining a volume correction amount based on the signal from the head position detection means, a volume adjustment means having a volume correction section for adjusting the volume based on a signal from the control means; Equipped with a sound generation means to detect the position of the seated person's head and correct the volume and left/right volume balance based on this, so even if the head position moves, the volume and volume balance are always appropriate. It is characterized by being constructed so that good acoustic effects can be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

As shown in Figure 1, the built-in speakers in automobile seats are
Head position detection means 1, control means 2, and volume correction section 3a
A volume adjustment means 3 equipped with fc is connected in order, and an audio device and a sound generation means 4 (not shown) are further connected to this volume adjustment means 3.

A specific example of the above configuration will be explained based on FIG. 2 and FIG.
・Equipped with 6a and ultrasonic receivers 5b and 6b. The distance sensors 5 and 6 are installed near the front center of a pair of left and right speakers 7 and 8, which are the sound generation means 4, respectively.
It is connected to the control means 2 via a harness 9. The seat 10 also includes a seat portion (not shown), a seat back 1
1 and a headrest 12, the headrest 12 is supported by a seat frame 14 projecting upward from the seat hack 11 at a position behind the head 13 of the seated person.

A plate-shaped speaker mounting bracket 15 is provided on the inside of the rear part of the headrest 12, and a speaker 7 is mounted on the front surface of both left and right ends of the speaker mounting bracket 15.
- Each of the screws 8 is attached with the front facing toward the front of the seat 10 using screws 16.

On the other hand, the sound 1 adjustment means 3 includes a volume correction unit 3a including a tone plate setting volume 17, a balance setting volume pair 18 and 19,
and a pair of amplifiers 2o and 21 are connected. The control section 2 and an audio device (not shown) are connected to the volume correction section 3a, and speakers 7 and 8 are connected to the amplifiers 20 and 21 via harnesses 9, respectively.

]--The processing operations performed by the control means 2 in the configuration described above will be explained based on the flowchart shown in FIG. First, the distance I1 from the distance sensor 5 to the head 13. and the distance 1 from the distance sensor 6 to the head 13. , B are input (sl/S2). Next, T-.

and 1. B and I-, then S3), a preset value f (Ll) corresponding to this Ll, and a value set by the volume setting volume]7 provided in the volume adjustment means 3. . Calculate the sum of the corrected sound 1v. 1. is determined (S4). However, here f(1,,I) is !
-, and ■. L is set to have the relationship shown in FIG. Next, take 1, A, calculate the difference from 1, and ■7
□S5), it is determined whether L2=O or not (S6). When this determination is YES, the head 13 is located at the same distance from the speakers 7 and 8. Therefore, the balance correction volume V of both speakers 7 and 8 is determined. , A and ■. The process returns to the first step S1 without changing tB.

On the other hand, if the determination in step S6 is NO, it is further determined whether r, , >o (S7). When this determination is YES, the head 13 is located away from the speaker 7. Therefore, balance correction volume ■ of speaker 7. 1. A does not correspond to the absolute value IL□ l of L2'+
As shown in FIG.
The value corresponding to 21 is determined (S8), and the first step S
Return to 1. Further, when the determination in step S7 is NO, the balance correction volume V of the speaker 8 is adjusted in the same manner as in step S8. 1B is determined (S9), and the process returns to the first step S1.

In this way, the control means 2 always controls the head 1 of the seated person.
Corrected volume ■ of speakers 7 and 8 according to the position of 3. Balance correction volume V. LA and VOLB are determined, and the volume correction section 3a corrects the volume of the audio signal sent from the audio equipment. Then, the audio signal whose volume has been corrected is sent to the amplifier 20.
- The signal is amplified at 21, and the speakers 7 and 8 are thereby driven to emit sound.

〔Effect of the invention〕

As described above, the car seat built-in speaker according to the present invention includes a head position detection means for detecting the position of the head of a seated person; a control means for determining a volume correction amount based on a signal from the head position detection means;
The configuration includes a volume adjustment means having a volume correction section that adjusts the volume based on a signal from the control means, and a sound generation means. As a result, even if the position of the seated person's head moves, it is possible to always obtain good acoustic effects with appropriate volume and volume balance.

[Brief explanation of drawings]

1 to 6 show one embodiment of the present invention, FIG. 1 is a block diagram showing the overall configuration, and FIG. 2 is a distance sensor (head FIG. 3 is an explanatory diagram of the embodiment of FIG. 2, FIG. 4 is a flowchart showing the processing performed by the control means, and FIG. The figure shows the sum of the distances LA-L, and the corrected volume ■. An explanatory diagram showing the relationship with L, FIG. 6 is the absolute value IL of the difference between distance LA-Ll
21 and speaker balance correction volume■. LA・■oLB
FIG. 2 is a head position detection means, 2 is a control means, 3 is a volume adjustment means, 3a is a volume correction section, 4 is a sound generation means, 5 and 6 are distance sensors (head position detection means), 7 and 8 are speakers ( 13 is the head of the seated person. Figure 1 Figure 2\ □'-”-13'l・1゜□-C Figure 3

Claims (1)

[Claims] 1. In a car seat built-in speaker that emits sound based on a signal from an audio device, a head position detection means detects the position of the head of a seated person; 1. A built-in speaker in a car seat, comprising a control means for determining a correction amount, a volume adjustment means having a volume correction section for adjusting the volume based on a signal from the control means, and a sound generation means.