JP2006273164A - On-vehicle acoustic system and on-vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle acoustic system capable of creating an optimum acoustic space for a user while suppressing the acoustic output. <P>SOLUTION: The on-vehicle acoustic system 1 comprises a pair of right and left first speaker 8 and second speaker 9 having an acoustic output unit installed forward of an on-vehicle seat 2 above a backrest part 6 of the on-vehicle seat 2, a third speaker 10 capable of outputting low-frequency sound range having the acoustic output unit embedded toward a front side of the backrest part 6 in a vicinity of a lumbar support part of the backrest part 6, and an acoustic signal output means 4 to output the acoustic signal to the first speaker 8, the second speaker 9 and the third speaker 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an in-vehicle acoustic system provided with a plurality of speakers for an in-vehicle seat and the in-vehicle seat.

In a general vehicle-mounted acoustic system, as shown in FIG. 5, speakers 32 are provided on a front seat door 30 and a rear seat door 31 of a vehicle, and each speaker 32 has a sound output direction (speaker front portion ( The direction of the sound output unit) is arranged in the vehicle interior. By installing the speakers 32 on the front seat door 30 and the rear seat door 31 in this way, the interior space of the vehicle doors 30 and 31 can be used as an enclosure for speakers, and it is easy to secure the installation space for the speakers 32. At the same time, there is an advantage that the bass reproduction capability of the speaker 32 can be enhanced. Similarly, the speaker 32 is often installed in the rear tray 33 that separates the trunk room and the vehicle compartment provided behind the rear seat. When the speaker 32 is installed in the rear tray 33, the trunk room is used as an enclosure. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 06-006885 (Page 2, FIG. 5, FIG. 7)

  However, when the speaker 32 is installed on the vehicle doors 30 and 31, there is a problem in that it is necessary to provide a drop hole for attaching the speaker to the sheet metal of the vehicle doors 30 and 31, which may cause a decrease in door strength. .

  In addition, noise outside the passenger compartment easily enters the interior of the passenger compartment through the drop holes formed in the sheet metal of the vehicle doors 30 and 31, which may cause a decrease in the quiet performance of the vehicle. .

  In addition, the speaker 32 is often placed under the vehicle door (under the feet) because of its installation space, etc., and the distance to the ear of the user (viewer) sitting in the seat increases the power of the amplifier. Tended to be. For this reason, if the user increases the volume too much, the sound is likely to be transmitted to the outside of the vehicle, and the sound in the vehicle interior may become noise outside the vehicle.

  This invention is made | formed in view of said problem, and makes it a subject to provide the acoustic system for vehicles which can create the optimal acoustic space for a user, suppressing output volume.

  In order to solve the above-described problem, a vehicle-mounted acoustic system according to the present invention includes a pair of left and right first speakers installed with a sound output unit facing a front direction of the vehicle-mounted seat at an upper portion of a backrest portion of the vehicle-mounted seat, and A second speaker; a third speaker capable of outputting a low-frequency sound embedded in the vicinity of the lumbar support portion of the backrest with a sound output portion facing the front surface of the backrest portion; the first speaker; the second speaker; And an acoustic signal output means for outputting an acoustic signal to the third speaker.

  Further, the upper part of the backrest part is extended to the vicinity of the ear position of the user seated on the vehicle seat, and the first speaker is installed in the vicinity of the ear position on the left ear side of the upper part of the extended backrest part. The second speaker may be installed in the vicinity of the ear position on the right ear side of the upper portion of the extended backrest portion.

  Furthermore, an acoustic signal delay means is provided for delaying the timing at which the acoustic signal is input to the third speaker by a predetermined time compared to the timing at which the acoustic signal is input to the first speaker and the second speaker. Also good.

  The acoustic signal output means outputs a left channel acoustic signal to the first speaker, outputs a right channel acoustic signal to the second speaker, and outputs the left channel acoustic signal to the third speaker. An acoustic signal including at least a band lower than the band of the channel acoustic signal and the right channel acoustic signal may be output.

  Further, the acoustic signal output means may output an acoustic signal obtained by synthesizing the left channel acoustic signal and the right channel acoustic signal to the third speaker.

  In addition, a fourth speaker capable of outputting a high frequency sound installed in front of the in-vehicle seat with the acoustic output portion directed toward the backrest portion is provided, and the acoustic signal output means includes a first speaker and a second speaker. In addition, an acoustic signal including at least a band higher than that of the acoustic signal output to the third speaker may be output to the fourth speaker.

  An in-vehicle seat according to the present invention includes a backrest portion and a seat portion, and a first speaker and a second speaker with a sound output portion directed in the front direction of the in-vehicle seat are provided on the upper portion of the backrest portion. In the vicinity of the lumbar support part of the backrest part, a third speaker capable of outputting a low frequency sound with the sound output part directed toward the front surface of the backrest part is embedded.

  The upper part of the backrest part is extended to the vicinity of the ear position of the user seated on the vehicle seat, and the first speaker is installed in the vicinity of the ear position on the left ear side of the upper part of the extended backrest part. The second speaker may be installed in the vicinity of the ear position on the right ear side of the upper portion of the extended backrest portion.

  Furthermore, the acoustic signal may be input to the third speaker at a timing delayed by a predetermined time compared to the timing at which the acoustic signal is input to the first speaker and the second speaker. .

  Also, a left channel sound signal is input to the first speaker, a right channel sound signal is input to the second speaker, and a left channel sound signal and a right channel sound signal are input to the third speaker. An acoustic signal including at least a band lower than the signal band may be input.

  Furthermore, an acoustic signal obtained by synthesizing the left channel acoustic signal and the right channel acoustic signal may be input to the third speaker.

  According to the vehicle-mounted acoustic system and the vehicle-mounted seat according to the present invention, the user can experience not only low-frequency sounds but also vibrations directly through the body with the third speaker.

  In addition, since the first speaker and the second speaker are installed on the backrest portion, it is possible to transmit a sufficient amount of sound to the user without increasing the sound output by the sound signal output means.

  Furthermore, by providing the third speaker, the sound signal output by the sound signal output means can be directly transmitted to the user as vibration as well as sound, so that the output volume is increased like a conventional woofer unit. Sufficient sound output can be transmitted to the user without passing too much, and it is possible to reduce the low-frequency sound that is output from leaking outside the vehicle and becoming noise outside the vehicle.

  Further, by providing the fourth speaker, it is easy to localize the front and it is easy to improve the stability of sound.

  Furthermore, since the first to third speakers are installed on the vehicle seat, it is easy to construct an acoustic space for each vehicle seat. For this reason, a different sound field effect can be applied to each vehicle-mounted seat, and a separate acoustic space can be realized for each vehicle-mounted seat, and a sound space suitable for the user can be provided for each vehicle-mounted seat. Become.

  Hereinafter, an in-vehicle acoustic system according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing an in-vehicle acoustic system 1 according to the present invention. The in-vehicle acoustic system 1 includes an in-vehicle seat 2, a center speaker 3, and an acoustic signal output unit 4. Yes.

  As shown in FIG. 2, the vehicle-mounted seat 2 includes a seat surface portion 5, a backrest portion 6, and a headrest 7.

  The seat surface portion 5 has a structure in which a urethane material having a high cushioning property is filled and the user is supported from below by a spring material so that the seated user can relax. Further, a slide rail 5a is provided on the bottom surface of the seat surface portion 5, and the vehicle seat 2 can be moved back and forth manually or electrically in the vehicle compartment.

  The backrest part 6 is attached to the seat surface part 5 so as to be able to rise and fall, and the angle of the backrest part 6 can be adjusted to an angle desired by the user.

  As for the backrest part 6, the upper end part is extended above the sheet | seat compared with the general vehicle seat. The upper part of the left and right shoulders of the backrest part 6 where the user A's shoulder or the like does not cover the surface of the backrest part 6 when sitting, specifically the upper part of the left and right shoulders of the backrest part 6 A full-range speaker (first speaker 8 and second speaker 9) of a BOX enclosure type having a diameter of about 50 mm is embedded in the vicinity of the ear height (near the ear position). Both the first speaker 8 installed on the left side (left side as viewed from the user A when the user A is seated) and the second speaker 9 installed on the right side have an acoustic output part (speaker front part) mounted on the vehicle seat. It is installed facing the front direction of 2. Further, the respective speakers 8 and 9 are arranged at positions where the center positions of the speakers 8 and 9 are separated from each other by about 15 cm with respect to the center of the in-vehicle seat 2. The distance between the user A's left and right ears is designed to be equal.

  At the lower part of the backrest part 6, specifically in the vicinity of the lumbar support part and where the low-frequency vibration can be directly applied to the waist of the user A, the acoustic output part faces the front side of the backrest part 6 and the woofer unit A (third speaker) 10 is embedded. As the woofer unit 10, a woofer speaker having a diameter of about 170 mm is used, and a low-frequency sound output can be performed as compared with the first speaker 8 and the second speaker 9. Between the sound output part of the woofer unit 10 and the outer surface on the front side of the backrest part 6, there is a soft filler that does not prevent sound transmission and vibration transmission in order to ensure comfort when the user A is seated. Is provided. Further, the woofer unit 10 is filled with a filler that is formed in a urethane and macaroni shape and is excellent in sound and vibration transmission.

  The headrest 7 is detachably provided on the uppermost part of the backrest 6 and is installed so as to support the head of the user A from the rear.

  As shown in FIG. 1, the center speaker 3 (fourth speaker) is installed on the front surface of the in-vehicle seat 2 with the sound output portion facing the front of the seat. By installing the center speaker 3 in front of the in-vehicle seat 2, the sound localization in the in-vehicle acoustic system 1 can be stabilized at the user's front position.

  The acoustic signal output unit 4 has a role of outputting acoustic signals to the first to fourth speakers. In the in-vehicle acoustic system 1 shown in the present embodiment, each of the speakers 3, 8, 9, 10 is used. In order to output an acoustic signal in a suitable sound range, 3.1 channel (ch) acoustic signal output can be performed.

  Specifically, the acoustic signal output unit 4 synthesizes the Lch (left channel) acoustic signal and the Rch (right channel) acoustic signal with respect to the center speaker 3, and further performs low-cut processing (4 kHz, -12 dB). After the application, the sound signal subjected to the time alignment process is output so that the user A does not feel the difference in sound with the other speakers 8, 10, 10. The adjustment time in the time alignment process is determined in consideration of the distance from the center speaker 3 to the user A's ear.

  The acoustic signal output unit 4 synthesizes the Lch (left channel) acoustic signal and the Rch (right channel) acoustic signal with respect to the woofer unit 10, and performs high cut processing (150 Hz, 12 dB) and low cut processing (60 Hz, After applying -12 dB), an acoustic signal delayed by time alignment processing is output. By this high cut processing and low cut processing, the low frequency sound is mainly emphasized, and the user A can experience not only the low frequency sound but also the vibration through the vehicle-mounted seat 2.

  Further, when comparing the speed at which the user A generally recognizes the sound (acoustic signal due to sound) transmitted by hearing and the speed at which the vibration (acoustic signal due to vibration) transmitted directly through the body is recognized, Experiments have shown that there is a slight difference in the time required to recognize the signal, and that recognition based on vibration is faster than recognition based on sound. For this reason, in the acoustic signal output unit 4, the acoustic signal for the woofer unit 10 is reduced in order to reduce the misregistration of the acoustic signal with other speakers (the first speaker 8, the second speaker 9, and the center speaker 3). Actively delayed by time alignment processing. This delay time (predetermined time) is determined according to the shape and structure of the in-vehicle seat 2 and the target user.

  Further, the acoustic signal output unit 4 applies high cut processing (4 kHz, −12 dB) and low cut processing (150 kHz, −12 dB) to the Lch (left channel) acoustic signal with respect to the first speaker 8, thereby generating low-frequency sound. An acoustic signal subjected to acoustic output correction is output. The acoustic signal output unit 4 also applies high-cut processing (4 kHz, −12 dB) and low-cut processing (150 kHz, −12 dB) to the Rch (right channel) acoustic signal for the second speaker 9, thereby producing a low-frequency sound. The sound signal subjected to the sound output correction is output.

  Here, since the woofer unit 10 outputs the low-frequency acoustic signal as vibration as described above, the sound intensity in the adjacent region (around 150 Hz) with the sound output from the first speaker 8 and the second speaker 9 is increased. Tends to feel weak overall. For this reason, in the acoustic signal to be output to the first speaker 8 and the second speaker 9, the acoustic signal in the adjacent region, that is, the acoustic signal in the low region is emphasized by correction and output by the first speaker 8 and the second speaker 9. Thus, the sound of the sound range reduced by the vibration by the woofer unit 10 is compensated, and the sound balance of the vehicle-mounted acoustic system 1 as a whole is maintained.

  Furthermore, in the vehicle-mounted acoustic system 1 described above, the first speaker 8 and the second speaker 9 are installed near the ear position of the user A, and the sound of the first speaker 8 installed on the left side is only the user's left ear. Not only to the right ear, but also to the sound of the second speaker 9 installed on the right side not only to the user's right ear but also to the left ear, causing a phenomenon that the sound cannot be heard uniformly (crosstalk phenomenon). There is a fear. For this reason, the acoustic signal output unit 4 uses the head-related transfer function to cancel the sound that enters the right ear from the left first speaker 8 and the sound that enters the left ear from the right second speaker 9 (crosstalk). Canceling process) is performed on the acoustic signals output to the first speaker 8 and the second speaker 9 to achieve a uniform acoustic space that is not affected by other acoustic output units, such as when listening to sound with headphones. Yes.

  In the on-vehicle acoustic system 1 configured as described above, since the first speaker 8 and the second speaker 9 are installed in the vicinity of the left and right ear positions of the user A, the acoustic output by the acoustic signal output unit 4 is excessively increased. It is possible to transmit a sufficient output sound to the user A without any problem. Further, by using the woofer unit 10, the acoustic signal output by the acoustic signal output unit 4 can be directly transmitted to the user A as vibration as well as sound, so that the output volume can be increased as in the conventional woofer unit. A sufficient output sound can be transmitted to the user A without making it too loud, and it is possible to reduce the low-frequency sound that is output from leaking outside the vehicle and becoming noise outside the vehicle.

  In addition, by providing the center speaker 3, it is easy to localize the front, and it is easy to improve the stability of sound.

  Further, by performing a crosstalk cancellation process in the acoustic signal output unit 4, a pseudo acoustic space close to that of a headphone can be realized, so that the front localization and further sound field effects (Dolby (registered commercial law) headphone technology, etc.) It becomes easy to construct a pseudo-acoustic technology using the headphones.

  Moreover, in the vehicle-mounted acoustic system 1 according to the present invention, since the system is constructed by the first to third speakers and the center speaker 3 installed on the vehicle-mounted seat 2, as shown in FIG. It becomes easy to construct an acoustic space every two. For this reason, it is possible to provide a different acoustic space for each vehicle-mounted seat 2 by applying a different sound field effect for each seat.

  As mentioned above, although the vehicle-mounted acoustic system 1 which concerns on this invention was demonstrated using drawing, the vehicle-mounted acoustic system which concerns on this invention is not limited to what was mentioned above. For example, in the above embodiment, the description has been given using an example in which the center speaker 3 is installed. However, the center speaker 3 is not necessarily required, and may be an in-vehicle acoustic system in which the center speaker 3 is not installed. In the in-vehicle acoustic system in which the center system is not installed, since it is not necessary to consider the distance variation to the center speaker 3 due to the back-and-forth movement of the in-vehicle seat 2, the acoustic space for each in-vehicle seat 2 as shown in FIG. Makes it easier to build.

It is the schematic block diagram which showed the vehicle-mounted acoustic system which concerns on this invention. It is the figure which showed the structure of the vehicle-mounted seat, Comprising: (a) has shown the front view, (b) has shown the side view. It is the schematic block diagram which showed the example which applied the vehicle-mounted acoustic system demonstrated in the Example to each seat. In FIG. 3, it is the schematic block diagram which showed the vehicle-mounted acoustic system except a center speaker. It is the schematic block diagram which showed the conventional vehicle-mounted acoustic system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle-mounted acoustic system 2 ... Vehicle-mounted seat 3 ... Center speaker (4th speaker)
4 ... Acoustic signal output unit (acoustic signal output means)
5 ... Seat surface part 5a ... Slide rail 6 ... Backrest part 7 ... Headrest 8 ... First speaker 9 ... Second speaker 10 ... Woofer unit (third speaker)
30 ... Front seat door 31 ... Rear seat door 32 ... Speaker 33 ... Rear tray

Claims (11)

A pair of left and right first speakers and a second speaker installed at the upper part of the backrest portion of the vehicle seat with the sound output section facing the front direction of the vehicle seat;
A third speaker capable of outputting a low-frequency sound embedded in a sound output portion facing the front surface of the backrest portion in the vicinity of the lumbar support portion of the backrest portion, and the first speaker, the second speaker, and the third speaker. And an acoustic signal output means for outputting an acoustic signal. The backrest upper part is extended to the vicinity of the ear position of the user seated on the vehicle seat,
The first speaker is installed in the vicinity of the ear position on the left ear side of the extended upper portion of the backrest,
The in-vehicle acoustic system according to claim 1, wherein the second speaker is installed in the vicinity of the ear position on the right ear side of the extended upper portion of the backrest.   Acoustic signal delay means for delaying the timing at which the acoustic signal is input to the third speaker by a predetermined time compared to the timing at which the acoustic signal is input to the first speaker and the second speaker is provided. The on-vehicle acoustic system according to claim 1 or 2. The acoustic signal output means includes
Output an audio signal for the left channel to the first speaker;
Outputting an audio signal for the right channel to the second speaker;
The acoustic signal including at least a band lower than the band of the left channel acoustic signal and the right channel acoustic signal is output to the third speaker. The vehicle-mounted acoustic system according to item.   5. The vehicle-mounted sound according to claim 4, wherein the acoustic signal output unit outputs an acoustic signal obtained by synthesizing the left-channel acoustic signal and the right-channel acoustic signal to the third speaker. system. A fourth speaker capable of outputting a high-frequency sound installed in front of the vehicle seat with the sound output portion directed toward the backrest portion;
The acoustic signal output means outputs, to the fourth speaker, an acoustic signal including at least a band higher than a band of the acoustic signal output to the first speaker, the second speaker, and the third speaker. The on-vehicle acoustic system according to any one of claims 1 to 5. It has a backrest and a seat,
Provided in a pair of left and right first speakers and second speakers with the sound output portion directed in the front direction of the in-vehicle seat on the backrest portion,
A vehicle-mounted seat characterized in that a third speaker capable of outputting a low-frequency sound with an acoustic output portion directed toward the front surface of the backrest portion is embedded in the vicinity of the lumbar support portion of the backrest portion. The backrest upper part is extended to the vicinity of the ear position of the user seated on the vehicle seat,
The first speaker is installed in the vicinity of the ear position on the left ear side of the extended upper portion of the backrest,
The in-vehicle seat according to claim 7, wherein the second speaker is installed in the vicinity of the ear position on the right ear side of the extended upper portion of the backrest portion.   The acoustic signal is input to the third speaker at a timing delayed by a predetermined time compared to a timing at which the acoustic signal is input to the first speaker and the second speaker. The in-vehicle seat according to claim 7 or claim 8.   A left channel acoustic signal is input to the first speaker, a right channel acoustic signal is input to the second speaker, and a left channel acoustic signal and a right channel acoustic signal are input to the third speaker. The vehicle-mounted seat according to any one of claims 7 to 9, wherein an acoustic signal including at least a band lower than the band is input. The vehicle seat according to claim 10, wherein an acoustic signal obtained by synthesizing the left channel acoustic signal and the right channel acoustic signal is input to the third speaker.

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