WO2010137218A1 - リアシートエンターテイメントシステム - Google Patents
リアシートエンターテイメントシステム Download PDFInfo
- Publication number
- WO2010137218A1 WO2010137218A1 PCT/JP2010/001787 JP2010001787W WO2010137218A1 WO 2010137218 A1 WO2010137218 A1 WO 2010137218A1 JP 2010001787 W JP2010001787 W JP 2010001787W WO 2010137218 A1 WO2010137218 A1 WO 2010137218A1
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- WIPO (PCT)
- Prior art keywords
- sound
- type speaker
- speaker unit
- rear seat
- sound conduit
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
- B60R11/0229—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for displays, e.g. cathodic tubes
- B60R11/0235—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for displays, e.g. cathodic tubes of flat type, e.g. LCD
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
- B60R11/0217—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for loud-speakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/028—Casings; Cabinets ; Supports therefor; Mountings therein associated with devices performing functions other than acoustics, e.g. electric candles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
- H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/02—Spatial or constructional arrangements of loudspeakers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R2011/0001—Arrangements for holding or mounting articles, not otherwise provided for characterised by position
- B60R2011/0003—Arrangements for holding or mounting articles, not otherwise provided for characterised by position inside the vehicle
- B60R2011/0028—Ceiling, e.g. roof rails
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R2011/0042—Arrangements for holding or mounting articles, not otherwise provided for characterised by mounting means
- B60R2011/008—Adjustable or movable supports
- B60R2011/0085—Adjustable or movable supports with adjustment by rotation in their operational position
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
Definitions
- the present invention relates to a speaker-integrated rear seat entertainment system that is attached to a vehicle interior ceiling.
- the in-vehicle information device can handle various types of video and audio with high entertainment so that passengers in the vehicle can spend comfortably, and AV (Audio Visual) devices that reproduce the video and audio It is becoming common to install a plurality of devices indoors.
- AV Audio Visual
- a ceiling-mounted rear monitor that is attached to the vehicle interior ceiling via a bracket is often installed for the rear seats in the second and third rows.
- the front seat has a head unit and the rear seat has a rear control unit.
- the rear control unit Through the rear control unit, content different from the front seat can be freely listened to by the ceiling-mounted rear monitor.
- most of the listening to the sound source is by wireless headphones or by an in-vehicle speaker driven in conjunction with the head unit.
- JP 2006-248253 A Japanese Patent No. 3167259
- the present invention has been made to solve the above-described problems, and provides a rear seat entertainment system that can avoid deterioration in sound quality without impairing the RSE compactness by using a linear phase correction technique. With the goal.
- a rear seat entertainment system includes a display unit that is freely opened and closed with a hinge as a shaft, and is mounted at a position that does not obstruct the opening and closing of the display unit, and is slit toward a listener.
- a sound conduit type speaker unit having an opening in the form of a filter, and a filter coefficient of an inverse correction filter is set based on acoustic characteristics of the sound conduit type speaker unit measured in advance, and the sound conduit type speaker unit is set by the inverse correction filter.
- a control device including an arithmetic processing unit that corrects the phase characteristic and the sound pressure frequency characteristic.
- the linear phase correction technology by using the linear phase correction technology, it is possible to provide a rear seat entertainment system that avoids deterioration of sound quality without impairing the RSE compactness.
- FIG. 1 It is a perspective view which shows the external appearance structure of the rear seat entertainment system which concerns on Embodiment 1 of this invention. It is sectional drawing of the rear seat entertainment system which concerns on Embodiment 1 of this invention. It is the front view seen from the rear seat of the rear seat entertainment system concerning Embodiment 1 of the present invention. It is a block diagram which shows the internal structure of the electric system of the rear seat entertainment system which concerns on Embodiment 1 of this invention. It is sectional drawing of the rear seat entertainment system which concerns on Embodiment 2 of this invention. It is the front view seen from the rear seat of the rear seat entertainment system which concerns on Embodiment 2 of this invention. It is sectional drawing of the rear seat entertainment system which concerns on Embodiment 3 of this invention. It is the front view seen from the rear seat of the rear seat entertainment system which concerns on Embodiment 3 of this invention.
- FIG. 1 is a perspective view of a rear seat entertainment system according to Embodiment 1 of the present invention
- FIG. 2 is a cross-sectional view
- FIG. 3 is a front view as seen from the rear seat. 1 to 3
- reference numeral 1 denotes an RSE body
- a liquid crystal display (LCD) monitor 2 which is a display unit for displaying an image
- a sound conduit type speaker unit 5 (5a, 5b) for outputting sound.
- Reference numeral 3 (3a, 3b) is an opening for transmitting the sound output from the sound conduit type speaker unit 5 (5a, 5b) to the rear seat occupant, and is formed with a slit.
- Reference numeral 10 denotes a vehicle interior ceiling provided with a lining, and the RSE body 1 is attached to the vehicle interior ceiling 10 via a bracket 30.
- the LCD monitor 2 is configured to be openable and closable with respect to the RSE main body 1 with the hinge 20 as an axis.
- the LCD monitor 2 is set in a spread state for the rear seat occupant when opened when used, and is stored in the RSE main body 1 when closed when not used.
- the LCD is protected.
- the sound conduit type speaker unit 5 (5a, 5b) includes a sound conduit 4 (4a, 4b) that guides the sound output from the speaker main body to the opening 3 (3a, 3b). Mounted in an unobtrusive position.
- Reference numeral 11 denotes a top plate of the vehicle, and a space is usually provided between the top plate 11 and the vehicle interior ceiling 10.
- FIG. 4 is a block diagram showing the internal configuration of the electrical system of the rear seat entertainment system according to Embodiment 1 of the present invention.
- the RSE body 1 (control device) includes an audio input terminal 21, an analog / digital converter (A / D converter 22), an arithmetic processing unit 23, and a digital / analog converter ( A D / A converter 24) and an output amplifier 25 are included.
- the RSE main body 1 includes a video input terminal 31, an A / D converter 32, a YUV (luminance color difference signal) / RGB (primary color signal) converter 33, a menu display superimposing unit 34, an LCD control unit 35, and the like. including.
- the system control part 41 which performs these sequence control is also comprised.
- FIG. 4 blocks denoted by the same reference numerals as in FIGS. 1 to 3 have the same names and functions as those shown in FIGS.
- the audio input terminal 21 outputs an analog audio signal output from an audio reproduction source (not shown) to the A / D converter 22.
- the A / D converter 22 converts the input analog audio signal into a digital audio signal and outputs the digital audio signal to the arithmetic processing unit 23.
- the arithmetic processing unit 23 performs sound quality deterioration correction processing on the digital audio signal using volume control, left / right balance adjustment, and linear phase correction technology, and outputs the result to the D / A converter 24.
- the D / A converter 24 converts the digital audio signal output from the arithmetic processing unit 23 into an analog audio signal and outputs the analog audio signal to the output amplifier 25.
- the output amplifier 25 amplifies the signal level of the analog audio signal output from the D / A converter 24, supplies it to the sound conduit type speaker unit 5, and outputs it as audio.
- the video input terminal 31 outputs an analog video signal from a reproduction source (not shown) to the A / D converter 32.
- the A / D converter 32 converts the analog video signal (composite signal) input from the video input terminal 31 into a digital YUV signal and outputs the digital YUV signal to the YUV / RGB converter 33.
- the YUV / RGB converter 33 converts the digital YUV signal into a digital RGB signal and outputs it to the menu display superimposing unit 34.
- the menu display superimposing unit 34 superimposes a user operation menu or the like on the video signal output from the YUV / RGB converter 33 and outputs it to the LCD control unit 35.
- the LCD control unit 35 controls output timing and the like in order to display the video signal from the menu display superimposing unit 34 on the LCD monitor 2.
- the system control unit 41 controls the RSE body 1 in order to control the A / D converter 22, the arithmetic processing unit 23, the D / A converter 24, the output amplifier 25, the A / D converter 32, It controls the sequence control of the YUV / RGB converter 33, the menu display superimposing unit 34, and the LCD control unit 35.
- an analog video signal input from an external device is input from the video input terminal 31 to the RSE body 1.
- the analog video signal input here is converted into video data in the digital YUV format by the A / D converter 32.
- the image data is converted into digital RGB format video data by the YUV / RGB converter 33 and output to the menu display superimposing unit 34.
- the menu display superimposing unit 34 superimposes a user operation menu on a video signal input from an external device as necessary.
- the video signal on which the user operation menu is superimposed is adjusted on the output timing of the video signal by the LCD control unit 35 and displayed on the LCD monitor 2.
- an analog audio signal input from an external device is input to the RSE main body 1 from the audio input terminal 21.
- the input analog audio signal is converted into data in a digital PCM (Pulse Code Modulation) format by the A / D converter 22 and input to the arithmetic processing unit 23.
- PCM Pulse Code Modulation
- the arithmetic processing unit 23 performs volume adjustment, left / right balance adjustment, and linear phase correction processing for correcting deterioration of sound quality on the input digital PCM format audio signal.
- the arithmetic processing unit 23 performs the linear phase correction process described above, it is necessary to measure the acoustic characteristics of the sound conduit speaker unit 5 (5a, 5b) based on the impulse response in advance. Based on the measurement result, the filter coefficient of the inverse correction filter (digital filter) is determined, and the convolution operation is performed on the input audio signal using the inverse correction filter designed here, and the sound conduit type speaker unit 5 (5a, 5a, The phase characteristic and the sound pressure frequency characteristic of 5b) are corrected.
- the details of this linear phase technique are disclosed in detail in Patent Document 2 described above. It is assumed that the arithmetic processing unit 23 in which the above-described inverse correction filter is incorporated is configured by a DSP (Digital Signal Processor).
- DSP Digital Signal Processor
- the audio signal subjected to the signal processing as described above is converted into an analog audio signal by the D / A converter 24, the signal level is amplified by the output amplifier 25, and then output to the sound conduit type speaker unit 5 (5a, 5b). Is done.
- the system control unit 41 controls the entire RSE body 1 and also controls the user interface.
- the RSE body 1 is attached to the vehicle interior ceiling 10 via a bracket 30.
- the sound conduit type speaker unit 5 (5a, 5b) is mounted inside the RSE body 1.
- the sound signal output from the sound conduit type speaker unit 5 (5a, 5b) passes through the slit of the opening 3 (3a, 3b) via the sound conduit 4 (4a, 4b) and is passed to the passengers in the rear seat.
- the sound conduit 4 (4a, 4b) is mounted to be inclined toward the rear seat, and gives sound directivity to the rear seat.
- the lateral width of the left and right openings 3a and 3b of the sound conduit type speaker unit 5 (5a and 5b) is limited by the design restriction that the lateral width of the RSE body 1 is shortened. It is shorter than the diameter of the speaker body of the type speaker unit 5 (5a, 5b). For this reason, the left and right sound conduits 4a and 4b have reverse horn shapes that gradually become narrower from the speaker main body of the sound conduit type speaker unit 5 (5a and 5b) toward the openings 3a and 3b. It will remain in the conduit 4 (4a, 4b). Therefore, the arithmetic processing unit 23 performs linear phase correction processing as disclosed in Patent Document 2 to correct the sound quality deterioration due to the sound conduit 4 (4a, 4b) and improve the sound quality deterioration due to the design restriction. .
- the sound conduit type speaker unit 5 (5a, 5b) having the slit-shaped opening 3 (3a, 3b) is opened and closed for the listener.
- the reverse correction filter is mounted in a position where it does not interfere with the electrical system (the arithmetic processing unit 23) of the RSE body 1 and is set based on the acoustic characteristics of the sound conduit type speaker unit 5 (5a, 5b) measured in advance.
- a so-called linear phase correction technique is applied to the RSE, thereby causing structural sound quality deterioration factors. Can be improved including insufficient performance of the sound conduit type speaker unit 5 (5a, 5b) to be used.
- the RSE main body 1 can be viewed without using wireless headphones by incorporating the sound conduit type speaker unit 5 (5a, 5b). Therefore, expensive headphones are not required and viewing is possible with no deterioration in sound quality. Further, by making the opening 3 (3a, 3b) into a slit shape, it is possible to correct the sound quality without losing the compactness of RSE and by applying the linear phase technique.
- FIG. FIG. 5 is a cross-sectional view of a rear seat entertainment system according to Embodiment 2 of the present invention
- FIG. 6 is a front view seen from the rear seat.
- the difference from the first embodiment shown in FIGS. 1 to 3 is that the sound conduit type speaker unit 5 (5a, 5b) is attached from the vehicle interior ceiling 10, and
- the sound conduit type speaker unit 5 (5a, 5b) has a structure in which the back surface is covered with the cover frame 12 (12a, 12b).
- Other configurations are the same as those of the first embodiment shown in FIGS. 1 to 3, and the configuration of the electric system is also the same.
- the sound output from the back side of the speaker and the sound output from the front side are opposite in phase. Will not be output.
- the arithmetic processing unit 23 performs a linear phase correction process to correct the sound quality deterioration due to the sound conduit 4 (4a, 4b) of the sound conduit type speaker unit 5 (5a, 5b), and the sound quality deterioration due to the design restriction. It is the same as that of Embodiment 1 to improve the above.
- the sound conduit type speaker unit 5 (5a, 5b) is attached to the upper part of the ceiling 10 in the passenger compartment, and the back surface of the sound conduit type speaker unit 5 (5a, 5b) is attached.
- the structure covered with the cover frame 12 (12a12b) enables low-pitched sound reproduction, and the RSE main body 1 is made thinner as the sound conduit type speaker unit 5 (5a, 5b) goes out of the RSE main body 1. There is an effect that can be done.
- the sound conduit type speaker unit 5 (5a, 5b) is mounted inside the RSE body 1, so that a large space on the back side of the speaker cannot be secured. For this reason, although it was disadvantageous for reproducing low sounds, in the second embodiment described above, as shown in FIG. 5, the sound conduit type speaker unit 5 (5a, 5b) is placed above the ceiling 10 in the vehicle interior. Mounting and providing a space in the range allowed by the gap provided between the vehicle top plate 11 and the cover frame 12 (12a, 12b) covering the back side of the sound conduit type speaker unit 5 (5a, 5b) The low-pitched sound reproduction which cannot deny the feeling of insufficient sound pressure is enabled. Further, by taking out the sound conduit type speaker unit 5 (5a, 5b) from the RSE main body 1, the thickness of the RSE main body 1 can be reduced.
- FIG. 7 is a cross-sectional view of a rear seat entertainment system according to Embodiment 3 of the present invention
- FIG. 8 is a front view seen from the rear seat.
- the difference from the second embodiment shown in FIGS. 5 to 6 is that the sound conduit type speaker unit 5 (5a, 5b) is connected to the vehicle interior ceiling 10 and the vehicle top plate 11.
- the plane baffle structure uses the space between the two. Others are the same as in the second embodiment.
- the cover frame 12 (12a, 12b) described in the second embodiment is removed, and the space between the vehicle interior ceiling 10 and the vehicle top plate 11 is set as the sound conduit type speaker unit 5 (5a, 5b). ), A relatively large space can be secured, and a powerful bass reproduction is possible compared to the second embodiment described above.
- the sound conduit type speaker unit 5 (5a, 5b) is taken out from the RSE body 1 and attached to the vehicle interior ceiling 10, and the arithmetic processing unit 23 performs linear phase correction processing, and the sound conduit 4 (4a, 4b) is used. Similar to the second embodiment, the effect of correcting the deterioration of sound quality and improving the deterioration of sound quality due to design restrictions can be obtained.
- the sound conduit type speaker unit 5 (5a, 5b) is attached to the upper part of the vehicle interior ceiling 10, and the space between the vehicle interior ceiling 10 and the vehicle top plate 11 is set.
- the arithmetic processing unit 23 shown in FIG. 4 may be realized by software, or at least a part thereof may be realized by hardware.
- the arithmetic processing unit 23 uses a reverse correction filter in which a filter coefficient is set based on the acoustic characteristics of the sound conduit type speaker unit 5 (5a, 5b) measured in advance, and the sound conduit type speaker unit 5 (5a, 5b).
- the data processing for correcting the phase characteristic and the sound pressure frequency characteristic may be realized on a computer by one or a plurality of programs, or at least a part thereof may be realized by hardware.
- the rear seat entertainment system can avoid deterioration in sound quality without impairing the compactness of the RSE by using the linear phase correction technology, the rear seat entertainment system is used for the speaker-integrated system attached to the ceiling of the vehicle interior. Suitable for
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- Otolaryngology (AREA)
- Mechanical Engineering (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
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Abstract
Description
一方、従来、テレビの分野で、音導管型スピーカユニットの音導管の開口部から放射される音響信号が、音導管の影響を受けてスピーカ自身が有する特性より劣化しないようにするため、音導管の伝達特性の逆特性を実現する非巡回型デジタルフィルタを用いて音声信号処理を行う(以下、リニアフェイズ補正技術という)音響再生装置が知られている(例えば、特許文献2参照)。
また、特許文献1に開示された技術のように、RSEにスピーカを内蔵する場合、RSEの大きさの制約により、径の大きなスピーカを実装できず、このため、低音再生の面で問題があった。更に、RSEのデザイン上の制約から丸いスピーカを実装できず、楕円スピーカを実装する場合がほとんどであったため、音に歪が生じて音質が劣化していた。このため、特許文献2に開示されたリニアフェイズ補正技術を適用して音質の劣化を補正することが望まれる。
実施の形態1.
図1は、本発明の実施の形態1に係るリアシートエンターテイメントシステムの斜視図、図2は断面図、図3は後部座席から見た正面図のそれぞれを示す。
図1~図3において、符号1はRSE本体であり、映像を表示する表示ユニットである液晶(LCD:Liquid Crystal display Device)モニタ2と、音声を出力する音導管型スピーカユニット5(5a、5b)とが実装されている。符号3(3a、3b)は、音導管型スピーカユニット5(5a、5b)による出力音声を後部座席乗員に伝える開口部であり、スリットが形成されている。符号10は内張りが施された車室内天井であり、RSE本体1は、ブラケット30を介して車室内天井10に取り付けられている。
音導管型スピーカユニット5(5a、5b)は、スピーカ本体から出力される音声を開口部3(3a、3b)まで導く音導管4(4a、4b)を備えており、LCDモニタ2の開閉に邪魔にならない位置に実装される。なお、符号11は車両の天板であり、この天板11と、車室内天井10との間には、通常、空間が設けられている。
図4に示されるように、RSE本体1(制御装置)は、音声入力端子21と、アナログ/デジタル変換器(A/D変換器22)と、演算処理部23と、デジタル/アナログ変換器(D/A変換器24)と、出力アンプ25とを含む。また、RSE本体1は、映像入力端子31と、A/D変換器32と、YUV(輝度色差信号)/RGB(原色信号)変換器33と、メニュー表示重畳部34と、LCD制御部35とを含む。また、これらのシーケンス制御を行うシステム制御部41も含んで構成される。
演算処理部23は、デジタル音声信号に対して音量制御、左右のバランス調整、リニアフェイズ補正技術を用いて音質劣化の補正処理を行い、D/A変換器24へ出力する。
YUV/RGB変換器33は、デジタルYUV信号をデジタルRGB信号に変換してメニュー表示重畳部34へ出力する。メニュー表示重畳部34は、YUV/RGB変換器33によって出力される映像信号にユーザ操作メニュー等を重畳させてLCD制御部35に出力する。LCD制御部35は、メニュー表示重畳部34からの映像信号をLCDモニタ2に表示するために出力タイミング等を制御する。
なお、システム制御部41は、RSE本体1の制御を行うために、上記したA/D変換器22、演算処理部23、D/A変換器24、出力アンプ25、A/D変換器32、YUV/RGB変換器33、メニュー表示重畳部34、LCD制御部35のシーケンス制御を司る。
ここで入力されたアナログ映像信号は、A/D変換器32でデジタルYUVフォーマットの映像データに変換される。その後、YUV/RGB変換器33でデジタルRGBフォーマットの映像データに変換され、メニュー表示重畳部34に出力される。メニュー表示重畳部34では、外部機器から入力された映像信号に、必要に応じてユーザ操作メニューを重畳する。ユーザ操作メニューが重畳された映像信号は、LCD制御部35で映像信号の出力タイミングなどの調整が行われ、LCDモニタ2に表示される。
なお、演算処理部23が上述したリニアフェイズ補正処理を実施するにあたり、事前にインパルス応答による音導管型スピーカユニット5(5a、5b)の音響特性を測定しておく必要がある。ここでの測定結果に基づき逆補正フィルタ(デジタルフィルタ)のフィルタ係数を決定し、ここで設計された逆補正フィルタを用いて入力音声信号に畳み込み演算を行い、音導管型スピーカユニット5(5a、5b)の位相特性と音圧周波数特性とを補正する。このリニアフェイズ技術の詳細は、上述した特許文献2に詳細に開示されている。なお、上記した逆補正フィルタが組み込まれる演算処理部23は、DSP(Digital Signal Processor)で構成されるものとする。
なお、システム制御部41は、RSE本体1全体の制御を行うとともに、ユーザインターフェースも制御するものとする。
音導管型スピーカユニット5(5a、5b)から出力される音声信号は、音導管4(4a、4b)を経由して、開口部3(3a、3b)のスリットを通り抜け、後部座席の乗員に到達する。音導管4(4a、4b)は、後部座席に向けて傾けて実装されており、後部座席へ音の指向性を持たせている。
そのため、演算処理部23で特許文献2に開示されるようなリニアフェイズ補正処理を行い、音導管4(4a、4b)による音質の劣化を補正するとともに、デザインの制約による音質の劣化を改善する。
また、開口部3(3a、3b)をスリット状にすることで、RSEのコンパクト感を失うことなく、また、リニアフェイズ技術を適用することで音質の補正が可能になる。
図5は本発明の実施の形態2に係るリアシートエンターテイメントシステムの断面図、図6は、後部座席から見た正面図である。
図5、図6に示されるように、図1~図3に示す実施の形態1との差異は、音導管型スピーカユニット5(5a、5b)を車室内天井10から取り付ける構造とし、かつ、音導管型スピーカユニット5(5a、5b)の背面がカバーフレーム12(12a、12b)で覆われる構造になっていることにある。他の構成は、図1~図3に示す実施の形態1と同様であり、また、電気系の構成も同様である。
このため、実施の形態2では、図5、図6に示されるように、スピーカの裏側の音が表側の音に干渉しないように、カバーフレーム12(12a、12b)で、音導管型スピーカユニット5(5a、5b)の裏側を密閉する構造とした。その際、裏側の空間を出来るだけ大きくした方が低音を再生することができる。
また、音導管型スピーカユニット5(5a、5b)をRSE本体1から上に出すことにより、RSE本体1の厚みを薄くすることが可能になる。
図7は、本発明の実施の形態3に係るリアシートエンターテイメントシステムの断面図、図8は、後部座席から見た正面図である。
図7、図8に示されるように、図5~図6に示す実施の形態2との差異は、音導管型スピーカユニット5(5a、5b)を、車室内天井10と車両天板11との間の空間を用いた平面バッフル構造としたことにある。他は、実施の形態2と同様である。
なお、音導管型スピーカユニット5(5a、5b)をRSE本体1から出して車室内天井10に取り付け、また、演算処理部23がリニアフェイズ補正処理を行い、音導管4(4a、4b)による音質の劣化を補正するとともに、デザインの制約による音質の劣化を改善する効果が得られることは実施の形態2と同様である。
例えば、演算処理部23が、事前に測定された音導管型スピーカユニット5(5a、5b)の音響特性に基づきフィルタ係数が設定される逆補正フィルタにより音導管型スピーカユニット5(5a、5b)の位相特性と音圧周波数特性とを補正するデータ処理は、1または複数のプログラムによりコンピュータ上で実現してもよく、また、その少なくとも一部をハードウェアで実現してもよい。
Claims (4)
- ヒンジを軸に開閉自在に実装された表示ユニットと、
前記表示ユニットの開閉に邪魔にならない位置に実装され、聴取者に向けて開口部を有する音導管型スピーカユニットと、
事前に測定された前記音導管型スピーカユニットの音響特性に基づき逆補正フィルタのフィルタ係数が設定され、前記逆補正フィルタにより前記音導管型スピーカユニットの位相特性と音圧周波数特性とを補正する演算処理部を含む制御装置と、
を備えたことを特徴とするリアシートエンターテイメントシステム。 - 前記開口部はスリット状であることを特徴とする請求項1記載のリアシートエンターテイメントシステム。
- 前記音導管型スピーカユニットは、
車室内の天井上部に取り付けられ、前記音導管型スピーカユニットの背面がカバーフレームで覆われる構造になっていることを特徴とする請求項1記載のリアシートエンターテイメントシステム。 - 前記音導管型スピーカユニットは、
車室内天井の上部に取り付けられ、前記車室内天井と車両天板との間の空間を用いた平面バッフル構造とすることを特徴とする請求項1記載のリアシートエンターテイメントシステム。
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US13/254,494 US20120045072A1 (en) | 2009-05-26 | 2010-03-12 | Rear seat entertainment system |
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JP2017144916A (ja) * | 2016-02-18 | 2017-08-24 | 富士通テン株式会社 | スピーカの取付方法、スピーカが取り付けられた車載視聴装置、および製造方法 |
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DE102018003190A1 (de) * | 2018-04-18 | 2019-10-24 | Paragon Ag | Sprachassistenzvorrichtung für Kraftfahrzeuge |
JP2023095014A (ja) * | 2021-12-24 | 2023-07-06 | 株式会社デンソーテン | 音響制御装置、および音響制御方法 |
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