JPH07227332A - Seat apparatus for vehicle with silencing function - Google Patents

Abstract

PURPOSE:To enable elimination of noise generated from a vehicle effectively by a method wherein a speaker is set inside a back rest of a seat to generate a sound wave same in the waveform and in the level as and opposite in the phase to the noise generated from the vehicle, and further, the residual noise is detected to correct the level and the waveform of the sound wave. CONSTITUTION:The noise generated by the running of a vehicle 1 is detected with a noise detector 6 and inputted into a silencing controller 5. The silencing controller 5 generates a waveform same in the level of a sound pressure as and opposite in phase to a detection signal and multiplies it by a transmission function to be amplified with an amplifier 7A. Left and right sealers 2 for adding sounds provided internally near the head part of a back rest of a seat 3 are driven by an output voice signal of the amplifier 7A. Furthermore, the noise not silenced yet is detected with a detector 10 and the level and the waveform thereof are corrected with an amplifier 7B to be inputted into the silencing controller 5 thereby enabling the effective elimination of noises generated from the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces noise to passengers in vehicles such as high-speed ships, railway vehicles, aircraft and vehicles.
The present invention relates to a vehicle seat device with a sound deadening function.

[0002]

2. Description of the Related Art A conventional vehicle such as a high-speed ship is designed so that noise generated by driving an engine while traveling is suppressed by a sound wave having the same sound pressure level and the same waveform and opposite phase, so that the passenger can sit on the seat. There are some that do not make passengers feel uncomfortable.

As shown in FIGS. 5 and 6, four additional sound speakers 30 for generating sound waves are arranged around the upper side of the seat 31, or two additional sound speakers 30 are arranged on the upper rear side of the seat 31. Then, the vicinity including the head 33 of the passenger 32 is set as the muffling area.

Further, as shown in FIG. 7, a speaker 30 for additional sound is arranged below the seat 31, and the head 3 of the passenger 32 is placed.
There is a system in which the vicinity including 3 is set as a muffling area.

[0005]

As described above, the seat 3
When the additional sound speaker 30 is mounted around the upper side of 1, the stand and the hanging tool for mounting the additional sound speaker 30 are required.

Further, in the case where the additional sound speaker 30 is arranged below the seat 31, the passenger 32 who should be the sound deadening area.
The distance to the head 33 of the passenger increases, and the head 3 of the passenger 32
In order to set 3 as the muffling area, a large capacity speaker 30 for additional sound is required. Further, when the seats 31 are installed side by side, sound waves generated from the additional sound speaker 30 installed in the adjacent seat 31 are mixed and the muffling effect is deteriorated.

Therefore, an object of the present invention is to provide a vehicle seat device with a sound deadening function that can solve the above problems.

[0008]

A means for solving the problems in the present invention is a vehicle with a sound deadening function, in which noise generated from the vehicle is muted with sound waves having the same sound pressure level and the same waveform and opposite phases. In the passenger seat device, an additional sound speaker for generating the sound wave is installed inside the seat back, and the additional sound speaker emits sound so that the sound deadening area by the sound wave is in the vicinity including the passenger's head. A muffling controller is provided for adjusting the sound pressure level and the waveform of the sound wave to be generated.

In addition, in a vehicle seat device with a sound deadening function, in which noise generated from a vehicle is muted with sound waves having the same sound pressure level and the same waveform and opposite phases, a speaker for additional sound for generating the sound waves. Is installed inside the seat back, and a sound deadening controller for adjusting the sound pressure level and the waveform of the sound wave emitted from the additional sound speaker so that the sound deadening area by the sound wave is near the passenger's head. Is provided, a residual noise detection sensor for detecting residual noise that cannot be completely silenced by the sound wave generated by the additional sound speaker, is arranged in a portion located near the head of the passenger of the seat back, and The muffling controller has a function of correcting the sound pressure level and the waveform of the sound wave based on the residual noise detection signal from the residual noise detection sensor. That.

A voice generator is connected to the additional sound speaker to superimpose a sound having a sound pressure level lower than the noise on the sound wave generated from the additional sound speaker.

[0011]

In the above structure, when noise is generated while traveling on a vehicle, the noise is detected by the noise detector, and the sound pressure level of the generated noise and its waveform are detected by the muffling controller based on the detection signal. Based on the detected value,
The control signal output from the muffling controller emits sound waves of the same sound pressure level and the same waveform as the propagation noise in the muffling area but in the opposite phase from the additional sound speaker, and the sound waves and the propagation noise cancel each other out and attenuate. , Erased.

Further, the muffling controller controls to emit a sound wave having the same sound pressure level and the same waveform as the noise in the muffling area and having an opposite phase, and when the residual noise detecting sensor detects residual noise, the residual noise signal is muted. Output to the controller,
The muffling controller corrects the sound pressure level and the waveform of the sound wave emitted from the additional sound speaker to attenuate and eliminate the residual noise.

Further, the sound deadening controller emits a sound wave having the same sound pressure level and the same waveform as the noise but having the same waveform and opposite phase, and the sound generator generates the sound information whose sound pressure is lower than that of the noise. Fired at a level.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle seat device with a sound deadening function according to the present invention will be described below with reference to the drawings.

First, a first embodiment of the present invention will be described with reference to the block diagram of FIG. 1. This is a vehicle 1 (for example, a high-speed ship).
Is a seat device with a muffling function of muffling noise generated by driving an engine generated during traveling of a vehicle, and a pair of left and right additional sound speakers 2 for generating sound waves that muffle the noise.
Is installed in the upper part of the backrest 3A of the seat 3 and causes the additional sound speaker 2 to generate a sound wave having the same level and the same waveform and opposite phase to the noise, and a sound deadening area due to the sound wave to the passenger 4's head. A silencer controller (for example, a digital signal processor or the like is used) 5 for adjusting the sound pressure and the waveform of the sound wave is provided so as to be in the vicinity including 4A.

A noise detector 6 installed near the engine, for example, is connected to the input side of the muffling controller 5.
An amplifier 7A is connected to the output side of the muffling controller 5, and the additional sound speaker 2 is connected to the amplifier 7A.

In the above-mentioned structure, the head 4A of the passenger 4 sitting on the seat 3 from the additional sound speaker 2 was previously tested.
The transfer function of the sound to the muffling area in the vicinity including is investigated and stored in the muffling controller 5.

By the way, when noise is generated while traveling on the vehicle 1, the noise is first detected by the noise detector 6, and the detection signal is input to the muffling controller 5 and the muffling controller 5
Creates a waveform of the same sound pressure level and opposite phase of the input detection signal and applies the inverse function of the transfer function obtained earlier and emits it from the additional sound speaker 2 to obtain the same sound pressure as the propagation noise in the muffling area. Sound waves having the same level and the same waveform but opposite phases can be created in the same area.

By doing so, the sound waves emitted from the additional sound speaker 2 and the propagation noise cancel each other out, and the propagation noise is attenuated and eliminated. Thus, according to the first embodiment of the present invention, the additional sound speaker 2 is installed in the seat 3
Since it is installed in the backrest 3A, the stand and the hanging tool for attaching the additional sound speaker 2 are not required as in the conventional case, and the distance from the additional sound speaker 2 to the muffling area is shortened. The capacity of the speaker 2 can be made smaller than that of the conventional one, so that it is possible to prevent sound waves generated from the additional sound speaker 2 installed in the adjacent seat from being mixed and to reduce the sound deadening effect. Even if noise is generated during traveling, it is possible to prevent the noise from being attenuated and erased to give the passenger 4 an uncomfortable feeling.

Next, a second embodiment of the present invention will be described with reference to FIG.
Describing based on the side view of FIG. 3, this is a residual noise detection sensor 1 for detecting residual noise that has not been completely silenced by the sound wave generated by the additional sound speaker 2.
0 is installed inside the backrest 3A of the seat 3 near the head in a portion (headrest) located near the head 4A of the passenger 4, and the sound wave generating portion of the speaker 2 for additional sound is the head of the passenger 4. The residual noise detection sensor 10 is arranged so as to be inclined toward the portion 4A, and is connected to the input side of the muffling controller 5 via an amplifier 7B. The muffling controller 5 is a speaker for additional sound via an amplifier 7A. 2 has a function of correcting the sound pressure level and the waveform of the sound wave based on the residual noise detection signal from the residual noise detection sensor 10.

In the above structure, as in the first embodiment,
The muffling controller 5 controls to emit sound waves having the same sound pressure level and the same waveform and opposite phase as the propagation noise so that the vicinity including the head 4A of the passenger 4 becomes a muffling area.

By the way, when a residual noise which cannot be completely erased by the sound wave is generated, the residual noise detecting sensor 10 detects the residual noise. The residual noise detected by the residual noise detection sensor 10 is output to the muffling controller 5 as a residual noise signal, and the muffling controller 5 erases the residual noise signal in the muffling area based on this residual noise signal. As described above, the sound pressure level and the waveform of the sound wave emitted from the additional sound speaker 2 are corrected. By emitting the corrected sound wave from the additional sound speaker 2 in this way, the noise in the muffling area is attenuated without generating residual noise,
to erase.

According to the second embodiment of the present invention, the noise is detected by the noise detector 6 as in the first embodiment, and the sound wave for attenuating and eliminating the propagation noise is emitted from the additional sound speaker 2. After that, when the residual noise detecting sensor 10 detects the residual noise, the waveform obtained from only the signal of the noise detector 6 is not suitable for attenuating and eliminating the propagation noise. However, here, the muffling controller 5 corrects the waveform obtained from only the signal of the noise detector 6 based on the noise output from the noise detector 6 into a sound pressure level and a waveform capable of eliminating residual noise, Since the sound is emitted from the additional sound speaker 2, the noise in the sound deadening area can be reliably attenuated and eliminated, and the passenger 4 can be prevented from feeling uncomfortable.

The rest of the configuration, functions and effects are the same as those of the first embodiment described above, and will be omitted. Next, a third embodiment of the present invention will be described with reference to the configuration diagram of FIG. 4, in which the sound wave generated from the additional sound speaker 2 has a sound pressure level lower than that of the noise. The voice generator 15 for superimposing voice (including music) has an amplifier 7A.
Is connected to the additional sound speaker 2 via.

Further, a residual noise detecting sensor 10 for detecting noise that cannot be completely silenced by the sound wave emitted from the additional sound speaker 2 is provided on the backrest 3A of the seat 3.
Reverse for arranging in a portion located near the head 4A of the passenger 4 and deleting the sound from the additional sound speaker 2 detected by the residual noise detection sensor 10 together with the residual noise before being input to the muffling controller 5. A filter 16 is connected to the input side of the muffling controller 5.

In the above structure, noise is detected by the noise detector 6 as in the first embodiment, the detection signal is input to the muffling controller 5, and based on the input detection signal,
The sound deadening controller 5 detects a sound pressure level and a waveform having a high correlation with noise, and a sound wave having the same sound pressure level and the same waveform as the noise but having an opposite phase is emitted from the additional sound speaker 2 to generate noise in the sound deadening area. Is attenuated and erased.

Simultaneously with this sound wave, information and music by voice are generated by the voice generator 15 and the additional sound speaker 2 is provided.
Is emitted at a sound pressure level lower than the transmitted noise. By the way, similarly to the second embodiment, the residual noise that cannot be completely erased by the sound wave emitted from the additional sound speaker 2 is detected by the residual noise detection sensor 10, and is also emitted from the additional sound speaker 2. Audio is detected.

However, here, the inverse filter 16 outputs an audio signal having a phase opposite to that of the voice detected by the residual noise detecting sensor 10, whereby the residual noise and the voice detected by the residual noise detecting sensor 10 are detected. Only the voice is erased, and only the residual noise signal is output to the muffling controller 5.

Then, the muffling controller 5 corrects the sound pressure level and the waveform of the sound wave emitted from the additional sound speaker 2 in the same manner as in the second embodiment so that the sound wave is emitted from the additional sound speaker 2. It controls and attenuates and eliminates the noise in the muffling area.

According to the third embodiment of the present invention, the sound emitted from the additional sound speaker 2 has a sound pressure level lower than that of noise, so that the passenger 1 sitting in the adjacent seat 3 can hear the sound. Only a specific passenger 4 can listen to this voice without listening to the voice. Therefore, the passenger 4 does not need to wear earphones or headphones, and does not experience any discomfort associated with wearing them.

The rest of the configuration and effects are the same as those of the first embodiment, so a description thereof will be omitted.

[0032]

As is apparent from the above description, the present invention provides a muffling controller for emitting sound waves having the same sound pressure level and the same waveform and opposite phases to the noise generated by the vehicle from the additional sound speaker. Since it is controlled by, the noise in the muffling area can be attenuated and eliminated. Also, since the additional sound speaker is placed inside the backrest of the seat, it is possible to omit the stand and hanging equipment for mounting the additional sound speaker as in the conventional case, and the additional sound speaker can be made smaller than the conventional one. Therefore, it is possible to prevent the sound deadening effect from being deteriorated by the sound waves generated from the additional sound speaker installed in the adjacent seat.

Further, the residual noise which cannot be completely silenced by the sound wave emitted from the additional sound speaker is detected by the residual noise detecting sensor, and the silence controller adds the residual noise based on the residual noise detecting signal from the residual noise detecting sensor. Since the sound pressure level and the waveform of the sound wave emitted from the sound speaker are corrected, the noise in the muffling area can be reliably attenuated and eliminated.

Since the sound emitted from the additional sound speaker has a sound pressure level lower than the noise level, passengers sitting in the adjacent seats do not hear the sound, and only specific passengers can use earphones or headphones. You can comfortably listen to audio without wearing.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a vehicle seat device with a sound deadening function according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a vehicle seat device with a sound deadening function according to a second embodiment of the present invention.

FIG. 3 is a side view showing the same usage state.

FIG. 4 is a configuration diagram of a vehicle seat device with a sound deadening function according to a third embodiment of the present invention.

FIG. 5 is a plan view of a conventional vehicle seat device with a sound deadening function.

FIG. 6 is a plan view of a vehicle seat device with a sound deadening function showing another conventional example.

FIG. 7 is a side view of a vehicle seat device with a sound deadening function showing another conventional example.

[Explanation of symbols]

 1 Vehicle 2 Speaker for Additional Sound 3 Seat 3A Backrest 4 Passenger 4A Head 5 Noise Reduction Controller 6 Noise Detector 7A Amplifier 7B Amplifier 10 Residual Noise Detection Sensor 15 Voice Generator 16 Inverse Filter

Continued Front Page (72) Inventor Mitsuru Mizuuchi 5-3-3, Nishikujo 5-3, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd.

Claims (3)

[Claims] 1. A vehicle seat apparatus with a sound deadening function, wherein a noise generated from a vehicle is silenced with sound waves having the same sound pressure level and the same waveform and opposite phases, and a speaker for additional sound for generating the sound waves. Is installed inside the seat back, and a sound deadening controller for adjusting the sound pressure level and the waveform of the sound wave emitted from the additional sound speaker so that the sound deadening area by the sound wave is near the passenger's head. A vehicle seat device with a sound deadening function, which is provided with. 2. A vehicle seat apparatus with a sound deadening function, wherein a sound generated from a vehicle is muted with sound waves having the same sound pressure level and the same waveform and opposite phases, and an additional sound speaker for generating the sound waves. Is installed inside the seat back, and a sound deadening controller for adjusting the sound pressure level and the waveform of the sound wave emitted from the additional sound speaker so that the sound deadening area by the sound wave is near the passenger's head. Is provided, a residual noise detection sensor for detecting residual noise that cannot be completely silenced by the sound wave generated by the additional sound speaker, is arranged in a portion located near the head of the passenger of the seat back, and The muffling controller has a function of correcting the sound pressure level and the waveform of the sound wave based on the residual noise detection signal from the residual noise detection sensor. Characteristic vehicle seat device with sound deadening function. 3. The additional sound speaker is connected to a sound generator for superimposing a sound wave generated from the additional sound speaker with a sound having a sound pressure level lower than noise. The vehicle seat device with a sound deadening function according to claim 2.