CN101014210B - Audio reproducing system and method thereof - Google Patents

Audio reproducing system and method thereof Download PDF

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Publication number
CN101014210B
CN101014210B CN2007100063496A CN200710006349A CN101014210B CN 101014210 B CN101014210 B CN 101014210B CN 2007100063496 A CN2007100063496 A CN 2007100063496A CN 200710006349 A CN200710006349 A CN 200710006349A CN 101014210 B CN101014210 B CN 101014210B
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CN
China
Prior art keywords
audio signal
sound
listener
loud speaker
loudspeaker unit
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Expired - Fee Related
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CN2007100063496A
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Chinese (zh)
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CN101014210A (en
Inventor
横田哲平
木原信之
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Sony Corp
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Sony Corp
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Priority claimed from JP2006024302A external-priority patent/JP4935091B2/en
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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
    • 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
    • H04R5/023—Spatial or constructional arrangements of loudspeakers in a chair, pillow
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • 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
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/022—Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/307—Frequency adjustment, e.g. tone control

Abstract

An audio reproducing system includes a pair of speaker units, a mounting unit for mounting the pair of speaker units, without being attached to a baffle board, to the vicinity of a listener's ears in a manner such that sounds emitted from the front and back of a diaphragm of each speaker unit are mixed, and an audio signal output unit for virtual sound imaging an input audio signal and outputting the virtual sound imaged signal to the pair of speaker units in a manner such that the listener listens to a sound reproduced by the pair of speaker units feeling as if the sound is emitted from a different speaker device.

Description

Audio reproducing system and method thereof
The reference of related application
The present invention comprises the Japanese patent application JP2006-024302 number relevant theme that was filed in the Japan special permission Room on February 1st, 2006, and its full content is quoted is contained in this.
Technical field
The present invention relates to be used to reproduce multichannel surround audio signal, the method and system of 5.1 sound channel surround audio signals for example.
Background technology
The audio-video playback system that is called as home theater is used just widely.The audio-video playback system will use such as 5.1 sound channels and carry out audio reproduction around multichannels such as audio systems around audio system from the rabbit of digital versatile disc (DVD) on the display of relatively large screen simultaneously.Thereby the audio-video playback system reproduces strong audio-video content.
5.1 the audio-video playback system of sound channel uses four types loud speaker; The loud speaker (center loudspeaker hereinafter referred to as) in the loud speaker in listener the place ahead (hereinafter referred to as before loud speaker), listener's dead ahead, the loud speaker at listener rear (back loud speaker hereinafter referred to as) and be exclusively used in the loud speaker of low-frequency sound.Be responsible for monophonic sounds in 100Hz or the following frequency band as the subwoofer of woofer.Other loud speaker is worked in the scope from 100Hz to 20kHz.
It is typical that known 5.1 channel audios-video reproduction system is shown in Figure 31.As shown in Figure 31, left front channel loudspeaker 10FL is placed in listener 4 left front, right front channels loud speaker 10FR be placed in listener 4 the right front, and center channel loud speaker 10C is placed in listener's dead ahead.
In addition, left back channel loudspeaker 10RL is placed in listener 4 left back, and right back channel loudspeaker 10RR is placed in listener 4 right back.Subwoofer 10SW as low-frequency effect (LFE) channel loudspeaker is placed in any position easily.
Six loud speaker 10FL, 10FR, 10C, 10RL, 10RR and 10SW are installed in its case, and are placed on its position.Six loud speakers leave the about 2 meters distance of listener 4 usually.
In known audio frequency-video reproduction system, the loudspeaker enclosure with volume of 15 liters is used to left front and the right front channels loud speaker.Nowadays each that is installed in the left front and right front channels loud speaker in the about 1 liter little case of volume is also referred to as satellite loudspeakers.Because these loud speakers innately can not provide low-frequency sound, and, added the loud speaker that is called subwoofer that is exclusively used in low-frequency sound for this is compensated.If other loud speaker beyond the subwoofer is installed in the little case, the crossover frequency that then offers the audio signal of subwoofer 10SW is generally 150Hz, a little higher than typical 100Hz, but still be enough low frequency.
In the speaker system of so configuration, when reproducing 5.1 channel audio signal, generate the sound of enough low frequencies from DVD.In addition, because reproduction side also comprises the special sound channel that is exclusively used in low-frequency sound, low-frequency sound is full of whole room in the mode of having no precedent in the past.Therefore, the user can enjoy the strong of sound and video and presents.
Yet the cubicle of being made by the wall and the flooring material of weakness may not have enough spaces to hold 6 loud speakers, and may cause the noise problem that causes to room outside owing to acoustical leakage.
When the user wishes to enjoy from the strong audio sound in the audio-video content of DVD with 5.1 common channel loudspeaker systems, need 90dB or above sound level.When the user attempts to enjoy the effect of multi-channel sound, need to solve noise problem to surrounding environment.
If sound is high frequency, even only Yishanmen or a wall also can easily be isolated sound.Yet the low-frequency sound that is low to moderate about 100Hz can not easily be isolated.Cubicle is not enough to isolate low-frequency sound.Especially, the sound of the 40Hz to 50Hz that is handled by subwoofer echoes very big, and can propagate in the wider relatively zone everywhere.
The sound that is reproduced by subwoofer may leak into not only that next room also may leak into upstairs or room downstairs, thereby may bother the people of next room.The frequency of sound is low more, and then sound is difficult to isolate more.Subwoofer is a problem, and can not enjoy 5.1 audio reproducing systems in the others excellence to the full.
A kind of audio reproducing system is disclosed in the Japanese Unexamined Patent Application 5-95591 communique, wherein intermediate frequency tremendously high frequency sound is reproduced by little loud speaker (being installed in the loudspeaker enclosure), and low-frequency sound is reproduced near listener's ear with low frequency earphone or use bone conduction mechanism.
Open according to this, low-frequency sound uses earphone or bone conduction mechanism to reproduce.The low-frequency sound of the high sound level that the listener hears is not transmitted to next room or neighbours house.
Summary of the invention
Disclosed technology adopts such as earphone or bone conduction mechanism and replaces reproducing sound near the ear of loud speaker the listener in Japanese Unexamined Patent Application 5-95591 communique.Though the acceptance level to vibrator is different with user's hobby, this vibrator is not so good as loud speaker and estimates can not accepted widely by the user aspect low frequency performance.In addition, wear headphone or bone conduction headphones listener and can feel inconvenience.
The disclosure technology has alleviated the noise problem of low-frequency sound, but does not satisfy the demand that many loud speakers are installed in the confined space.
Therefore even being desirable to provide loud speaker that a kind of usefulness is less than the number of channel number reproduces multichannel and also can control audio reproducing method and the audio reproducing system that propagates into next door sound level around signal and with the high volume level reproducing signal.
The audio reproducing system of one embodiment of the present of invention comprises: a pair of loudspeaker unit; Installation unit is used for so that the mixed mode of sending from the front and back of the vibrating diaphragm of each loudspeaker unit of sound will not be installed to this a pair of loudspeaker unit of sound panel is installed near listener's the ears; And the audio signal output unit, be used for so that the listener listens to by this sound perception that loudspeaker unit is reproduced is to send the same mode virtual acoustic imaging input audio signal and export the signal of virtual acoustic imaging to this to loudspeaker unit from other speaker unit with regard to the onomatopoeia sound.
The listener can hear the sound of high volume level, because loudspeaker unit is maintained near listener's the ear.
Because loudspeaker unit is not installed on the sound panel, so the sound that is reproduced sends from the front and back of the vibrating diaphragm of loudspeaker unit.The sound that sends from the front of vibrating diaphragm is opposite with the sound phase place of sending from the back side of vibrating diaphragm each other.When these sound were externally propagated, these sound were cancelled out each other and its strength retrogression.The frequency of sound is low more, and then sound attenuating is big more.Pass to the sound in neighbours house, especially low-frequency sound is decayed significantly.
According to all embodiment of the present invention, loudspeaker unit virtual acoustic imaging (acoustic image location) goes out the preceding channel sound or the back channel sound of multitrack surround sound, is preceding channel sound or back channel sound then with treated signal reproduction.Embodiments of the invention have been eliminated necessity of preceding channel loudspeaker and back channel loudspeaker.
According to all embodiment of the present invention, loudspeaker unit is installed near listener's the ear.If reproduce sound with high volume level, then low-frequency sound is to the propagation Be Controlled in neighbours house.Because the audio signal that offers loudspeaker unit is by the virtual acoustic imaging, the preceding channel sound of multitrack surround sound sound and back channel sound are reproduced virtually by loudspeaker unit.Thereby, reproduce multitrack surround sound with fewer purpose loud speaker.
Description of drawings
Fig. 1 is the block diagram according to the audio reproducing system of first embodiment of the invention;
The loud speaker that Fig. 2 illustrates according to the audio reproducing system of the first embodiment of the present invention is provided with configuration.
Fig. 3 illustrates the loud speaker setting according to the first embodiment of the present invention;
Fig. 4 is the curve chart of explanation according to the operation of the audio reproducing system of the first embodiment of the present invention;
Fig. 5 illustrates the loud speaker that is provided with according to the first embodiment of the present invention;
Fig. 6 A and Fig. 6 B illustrate the loud speaker of installing according to the first embodiment of the present invention;
Fig. 7 is the block diagram according to the audio signal output device in the audio reproducing system of the first embodiment of the present invention;
Fig. 8 is the figure of a part of the audio signal output device of key diagram 7;
Fig. 9 is the block diagram of audio reproducing system according to a second embodiment of the present invention;
The loud speaker that Figure 10 illustrates in according to a second embodiment of the present invention the audio reproducing system is installed example.
Figure 11 is the block diagram of the audio reproducing system of a third embodiment in accordance with the invention;
The loud speaker that Figure 12 illustrates in the audio reproducing system of a third embodiment in accordance with the invention is provided with configuration;
The loud speaker that Figure 13 illustrates in the audio reproducing system of a third embodiment in accordance with the invention is installed example;
Figure 14 A and 14B illustrate the loud speaker of installing in the audio reproducing system of a third embodiment in accordance with the invention;
Figure 15 is the block diagram of the audio signal output device in the audio reproducing system of a third embodiment in accordance with the invention;
Figure 16 is the figure of a part of the audio signal output device of explanation Figure 15;
Figure 17 is the block diagram that the audio reproducing system of a fourth embodiment in accordance with the invention is shown;
The loud speaker that Figure 18 illustrates in the audio reproducing system of a third embodiment in accordance with the invention is provided with configuration;
Figure 19 is the block diagram of the audio signal output device in the audio reproducing system of a fourth embodiment in accordance with the invention;
The loud speaker that Figure 20 illustrates in the audio reproducing system according to an embodiment of the invention is installed example;
The loud speaker that Figure 21 illustrates in the audio reproducing system according to an embodiment of the invention is installed example;
The loud speaker that Figure 22 illustrates in the audio reproducing system according to an embodiment of the invention is installed example;
The loud speaker that Figure 23 illustrates in the audio reproducing system according to an embodiment of the invention is installed example;
The loud speaker that Figure 24 illustrates in the audio reproducing system according to an embodiment of the invention is installed example;
The loud speaker that Figure 25 illustrates in the audio reproducing system according to an embodiment of the invention is installed example;
The loud speaker that Figure 26 illustrates in the audio reproducing system according to an embodiment of the invention is installed example;
The loud speaker that Figure 27 illustrates in the audio reproducing system according to an embodiment of the invention is installed example;
The loud speaker that Figure 28 illustrates in the audio reproducing system according to an embodiment of the invention is installed example;
The loud speaker that Figure 29 illustrates in the audio reproducing system according to an embodiment of the invention is installed example;
The loud speaker that Figure 30 illustrates in the audio reproducing system according to an embodiment of the invention is installed example; And
Figure 31 illustrates a typical speaker in the known audio reproducing system example is installed.
Embodiment
Describe below in conjunction with the audio reproducing system that is used to reproduce 5.1 sound channel surround sounds of accompanying drawing all embodiment according to the present invention.
First embodiment
The audio reproducing system of the first embodiment of the present invention is described below.This audio reproducing system reproduces video and 5.1 sound channel surround sounds based on the vision signal of being reproduced by DVD player and audio signal or based on the digital broadcast signal that is received by television receiver.
Fig. 1 illustrates the audio reproducing system of first embodiment.
As shown in Figure 1, the audio reproducing system of first embodiment comprises: the television receiver 1 with two loud speaker 11FL and 11FR; DVD player 2; Audio signal output device 3; Be installed in two loud speaker 11SW1 and 11SW2 near listener's 4 ears.
According to the first embodiment of the present invention, two loud speaker 11FL of television receiver 1 and 11FR are as the left front and right front channels audio signal of 5.1 sound channel surround sounds.Two loud speaker 11FL and 11FR can be installed in the television receiver 1 or can be arranged in 1 minute with television receiver.
According to the first embodiment of the present invention, be arranged at the effect that near listener 4 the ear two loud speaker 11SW1 and 11SW2 play the subwoofer of the all-bottom sound that is used for 5.1 sound channel surround sounds.According to first embodiment, the left back and right back channel audio signal of audio signal output device 3 virtual acoustic imagings 5.1 sound channel surround sounds, and the signal that provides the virtual acoustic imaging to two loud speaker 11SW1 and 11SW2 as subwoofer.
Television receiver 1 has the function of receiving digital broadcast signal.Television receiver 1 reproduces the audio signal of digital broadcast program from digital broadcast signal, and the video of the digital broadcast program that reproduced is presented on the display screen 1D of television receiver 1 sound of the digital broadcast program that is reproduced from loud speaker 11FL and 11FR output simultaneously.
If the audio frequency of digital broadcast program is a multitrack surround sound, then the sound of the digital broadcast program that is reproduced that sends from loud speaker 11FL and 11FR also comprises center channel sound and left back and right back channel sound except left front and right front channels sound.
According to first embodiment, receive the audio signal Au1 that reproduces then by television receiver 1 and be provided for audio signal output device 3.
The vision signal and the audio signal that are write down on DVD player 2 reproductions and the output DVD.The vision signal Vi that is reproduced by DVD player 2 is provided for television receiver 1.Then, the video that is reproduced in response to vision signal Vi is displayed on the display screen 1D of television receiver 1.The audio signal Au2 that is reproduced by DVD player 2 is provided for audio signal output device 3.
According to first embodiment, audio signal output device 3 has the function of the data of decoding 5.1 sound channel surround sounds.When the signal of the digital broadcast program that is received by television receiver 1 was rendered into 5.1 sound channel surround sounds, audio signal output device 3 produced near the first loud speaker 11SW1 that will offer two ears that are installed in listener 4 respectively and the audio signal of second loud speaker and 11SW2.
When using the video that reproduces by DVD player 2 and audio frequency, audio signal output device 3 not only near the first loud speaker 11SW1 the ear that is installed in listener 4 and the second loud speaker 11SW2 provides audio signal, also generate the audio signal of the L channel and right channel loudspeaker 11FL and the 11FR that are used for television receiver 1, provide this audio signal to corresponding loud speaker then.
According to first embodiment, the loud speaker 11FL of audio signal output device 3 in television receiver 1 provides left front channel audio signal L and center channel audio signal C, and the loud speaker 11FR in television receiver 1 provides right front channels audio signal R and center channel audio signal C.
Audio signal output device 3 provides the left back channel audio signal RL* and the low-frequency audio signal LFE of virtual acoustic imaging as described below to loud speaker 11SW1, and the right back channel audio signal RR* and the low-frequency audio signal LFE of virtual acoustic imaging as described below are provided to loud speaker 11SW2.
With reference to Fig. 2 the loud speaker in the audio reproducing system of the first embodiment of the present invention being provided with configuration discusses.
As shown in Figure 2, left front channel loudspeaker 11FL is set at listener 4 left front, and right front channels loud speaker 11FR is set at listener 4 right front.
Loud speaker 11FL and 11FR are housed in the television receiver 1.Loud speaker 11FL comprises the little loudspeaker enclosure 12FL of loudspeaker unit 13FL and dress loudspeaker unit 13FL.The front panel of loudspeaker enclosure 12FL (such as the front panel of television receiver 1) is as the sound panel of supporting loudspeaker unit 13FL.Loud speaker 11FR comprises the little loudspeaker enclosure 12FR of loudspeaker unit 13FR and dress loudspeaker unit 13FR.The front panel of loudspeaker enclosure 12FR (such as the front panel of television receiver 1) is as the sound panel of supporting loudspeaker unit 13FR.If do not need to distinguish loud speaker 11FL and 11FR, then hereinafter among loud speaker 11FL and the 11FR each all is called preceding loud speaker.
According to first embodiment, loud speaker 11SW1 and loud speaker 11SW2 are set near listener 4 the ear and listener 4 head is clipped in therebetween in the vibrating diaphragm of each loud speaker mode towards corresponding ear of the listener 4.Subwoofer 11SW1 keeps directly not contacting with ear with listener 4 head with 11SW2.These two loud speaker 11SW1 and 11SW2 are not contained in the loudspeaker enclosure, thereby the sound that sends from the front and back of the vibrating diaphragm of each loudspeaker unit is mixed.Sound panel all is not installed on each in loud speaker 11SW1 and 11SW2.More particularly, each among loud speaker 11SW1 and the 11SW2 is mounted in the mode that its vibrating diaphragm outwards exposes to the open air.Randomly, as long as acoustics is not affected, can covers loud speaker with the plate of net or perforate and maybe the sound panel of perforate can be installed on loud speaker.
According to first embodiment, provide low-frequency audio signal LFE jointly to two loud speaker 11SW1 and 11SW2, so they send the LFE sound channel low-frequency sound of mutual homophase.Two loud speaker 11SW1 and 11SW2 thereby play the effect of subwoofer.Hereinafter also these two loud speaker 11SW1 and 11SW2 are called subwoofer.
Because in above-mentioned the setting, near listener 4 ear, send LFE sound channel low-frequency sound, so listener 4 can hear the sound of high volume level.From listener 4 a distance, the sound that the front and back of the vibrating diaphragm of each from the loudspeaker unit of subwoofer 11SW1 and 11SW2 sends becomes 180 ° of phasic differences mutually, thereby cancels out each other to other people almost unheard volume.Different with known technology, thus the audio reproducing apparatus of the first embodiment of the present invention can prevent that low-frequency sound from propagating into the neighbours house and avoiding bothering neighbours.
In order to verify the decay of low-frequency sound, as shown in Figure 3, at the sound that picks up apart from the d place from loudspeaker unit 11SW, then the sound that is picked up is carried out the analysis of the frequency characteristic aspect of sound pressure level by microphone 14 from the subwoofer such as the loudspeaker unit 11SW of 17cm size.Fig. 4 is the curve chart of the frequency characteristic of loudspeaker unit 11SW.In this case, loudspeaker unit 11SW is not loaded in the case and sound panel is not installed on loudspeaker unit 11SW.
When the distance between loudspeaker unit 11SW and the microphone 14 is set to 10cm, 20cm, 40cm and 80cm respectively, record four frequency characteristicss of Fig. 4.
As shown in Figure 4, if loudspeaker unit 11SW is not contained in the audio amplifier, then the following sound of 1kHz is decayed significantly, and sound frequency is low more, and the decay of sound is remarkable more.
According to first embodiment, subwoofer 11SW1 and 11SW2 and listener's 4 left ear and the respective distance dsw between the auris dextra are configured to low-frequency sound does not wherein have the scope propagated damply too much.Should be configured to about 20cm apart from dsw in this article.
Distance between each ear of the first loud speaker 11SW and listener 4 is generally 2m.According to first embodiment, the 20cm between each ear of subwoofer 11SW1 and 11SW2 and listener 4 apart from dsw be in the known technology distance 1/10th.
Therefore, making listener 4 experience the required energy of acoustic pressure is one of percentage of energy required in the known technology.For example, if adopt the device of the first embodiment of the present invention, then can realize the acoustic pressure that the amplifier by 100w provides with the amplifier of 1W.
According to first embodiment, the difference that offers in the power of audio signal output of loud speaker makes sound dispersion less.Under the low-frequency sound of for example 20Hz, 30Hz and 40Hz, the low-frequency sound homophase is cancelled out each other, and except the people of very close subwoofer 11SW1 and 11SW2, other people almost can't hear sound.On the other hand, because many concentration of energy are at the low frequency range of sound, so the validity of the powerful sound effect of isolation of DVD software program is more remarkable.
Use above-mentioned setting,, then realized effect of sufficient if the low-frequency sound of only decaying is very important.Similarly, even reproduce low-frequency sound sound in addition, also can realize soundproof effect from subwoofer 11SW1 and 11SW2.
5.1 the sound channel surround sound also comprises center channel sound and left back and right back channel sound.In known technology, center channel loud speaker 11C comprises loudspeaker enclosure 12c and the loudspeaker unit 13c that is contained among the loudspeaker enclosure 12c.Loudspeaker unit 13C is fixed in the front panel as sound panel of the loudspeaker enclosure 12c that is represented by the dotted line among Fig. 2.Center channel loud speaker 11C is set at the place ahead of listener 4.
Similarly, in known technology, left back channel loudspeaker 11RL comprises the little loudspeaker enclosure 12RL of back loudspeaker unit 13RL and this back loudspeaker unit 13RL that packed into.Back loudspeaker unit 13RL is fixed in the front panel as sound panel of the loudspeaker enclosure 12RL that is represented by the dotted line among Fig. 2.Right back channel loudspeaker 11RR comprises the little loudspeaker enclosure 12RR of the back loudspeaker unit 13RR and the back loudspeaker unit 13RR that packed into.Back loudspeaker unit 13RR is fixed in the loudspeaker enclosure 12RR front panel of being represented by the dotted line among Fig. 2.
Yet,, loud speaker 11C, the 11RL and the 11RR that are exclusively used in center channel sound and left back and right back channel sound respectively are not set according to first embodiment.As previously mentioned, use two loud speaker 11FL and 11FR in the television receiver 1 and two the loud speaker 11SW1 and the 11SW2 that are arranged near listener 4 the ear reproduce sound.
More particularly, center channel audio signal C is added to each among left front channel audio signal L and the right front channels audio signal R, and the signal of gained is offered loud speaker 11FL and 11FR respectively and is used for audio reproduction then.
Left back channel audio signal RL is become left back channel audio signal RL* by the virtual acoustic imaging, and left back then channel audio signal RL* is provided for towards the loud speaker 11SW1 of left ear of the listener 4.Right back channel audio signal RR is become right back channel audio signal RR* by the virtual acoustic imaging, and right back then channel audio signal RR* is provided for towards the loud speaker 11SW2 of listener 4 auris dextra.
Because the distance between each ear of each among loud speaker 11SW1 and the 11SW2 and listener 4 is very little, so the radiant energy of left back and right back channel audio signal RL and RR is lowered to help sound insulation.
Audio reproduction left back and right back sound channel is undertaken by near subwoofer 11SW1 the ear that places listener 4 and 11SW2.Because left back and right back channel sound is mainly derived from the sound reverberation of listener 4 back, so the location of left back and right back channel audio signal is so unimportant.Available fewer purpose loud speaker and low noise levels produce good surround sound.
As previously mentioned, because foreshorten to about 20cm apart from dsw from typical approximately 2 meters between listener 4 ear and corresponding subwoofer 11SW1 and the 11SW2, so can be with the about 20dB of acoustic pressure reduction of subwoofer 11SW1 and 11SW2.To left back and right back channel audio signal RL and RR also is so, thereby and realizes energy-conservation.
As a loud speaker example is installed, loud speaker can be installed on the massage armchair.
Fig. 5 illustrates such example.Two loud speaker 11SW1 and 11SW2 that expection is installed near listener 4 the ear are installed on the chair 20.
Chair 20 has the structure of business class seat in the aircraft for example.Speaker retainer 22 is installed on the top 21a of chair 20 backrests 21.Speaker retainer 22 supporting subwoofer 11SW1 and 11SW2.
Fig. 6 A and Fig. 6 B illustrate an example of speaker retainer 22.Speaker retainer 22 is configured to the metal tube 221 made by for example aluminium.Shown in Fig. 6 B, metal tube 221 is flat loop configuration.Subwoofer 11SW1 and 11SW2 and other auxiliary subwoofer 11SW3 and 11SW4 are maintained in the space of being defined by metal tube 221.
If subwoofer 11SW1 and 11SW2 low-frequency sound underpower are singly arranged, then auxiliary subwoofer 11SW3 and 11SW4 support to place near listener 4 subwoofer 11SW1 and the 11SW2 of ear.Auxiliary subwoofer 11SW3 and 11SW4 are not requisite key element.
According to first embodiment, only provide low frequency signal (LFE signal) to auxiliary subwoofer 11SW3 and 11SW4.The same with 11SW2 with subwoofer 11SW1, auxiliary subwoofer 11SW3 and 11SW4 can also receive the audio signal of virtual acoustic imaging.
Metal tube 221 has flat loop configuration.In plane graph as shown in Figure 6A, the flat annular section of metal tube 221 is roughly U-shaped so that metal tube 221 surrounds the both sides (ear) and the back side of the head except that the front of listener's 4 heads.
222a of foot and 222b extend metal tube 221 is supported on the backrest 21 of chair 20 from metal tube 221.222a of foot and 222b are detachably connected to backrest 21 on the chair 20 with metal tube 221.The top 21a of the backrest 21 of chair 20 has the deep trouth (not shown) that is used to accommodate 222a of foot and 22b.By being housed in 222a of foot and the 222b in the deep trouth in the backrest 21, metal tube 221 is fixed in backrest 21.
Subwoofer 11SW1 and 11SW2 make subwoofer 11SW1 and 11SW2 support towards left ear of the listener 4 and the mode of auris dextra by U-shaped metal tube 221 when being sitting on the chair 20 as listener 4.Auxiliary subwoofer 11SW3 and 11SW4 are made when being sitting on the chair 20 as listener 4 by metal tube 221 and assist subwoofer 11SW3 and 11SW4 to support towards the mode at the back side of listener 4 head.
When listener 4 was sitting on the chair 20, the distance between each in the 11SW4 of listener 4 head (ears) and subwoofer 11SW1 was about 20cm.
Audio signal output device 3 provides corresponding channel audio signal to subwoofer 11SW1 to 11SW4 by holding wire (loud speaker cable).
Fig. 7 is the block diagram according to the audio signal output device 3 of the first embodiment of the present invention.The audio signal output device 3 of first embodiment comprises audio signal processor 300 and comprises control of microcomputer device 100.
Controller 100 comprises CPU (CPU) 101.Controller 100 also comprises: be used for the read-only memory (ROM) 103 of storing software program, as the relevant rear of random-access memory (ram) 104, a plurality of input-output port one 05 to 108, user interface 110 and the head transfer function storage 111 of the service area of CPU 101, each key element all is connected to CPU 101 by system bus 102.User interface 110 comprises the keyboard and the receiver of remote-control sytem of with remote command person communicating by letter of reception to the input of audio signal output device 3.
According to first embodiment, audio signal output device 3 can receive from the audio signal Au1 of television receiver 1 with from the audio signal Au2 of DVD player 2.Audio signal Au1 and audio signal Au2 are provided for input selector switch 301.
When the user when user interface 110 input operations are imported, input selector switch 301 is carried out switching manipulation in response to the switching signal of coming the input-output interface 105 in the self-controller 100.When the user selected audio signal from television receiver 1, input selector switch 301 was selected audio signal Au1.When from the audio signal of DVD player 2 when selected, input selector switch 301 is selected audio signal Au2.
The audio signal of being selected by input selector switch 301 is provided for 5.1 channel decoding devices 302.When receiving one of audio signal Au1 and audio signal Au2 from input selector switch 301,5.1 channel decoding device 302 is selected audio signal decoding, thereby exports left front and right front channels audio signal L and R, center channel audio signal C, left back and right back channel audio signal RL and RR and low-frequency audio signal LFE.
Left front channel audio signal L and center channel audio signal C from 5.1 channel decoding devices 302 are synthetic by synthesizer 303, and export the synthetic output (L+C) of gained to audio output 307 by amplifier 305.Then, the audio signal that exports audio output 307 to is provided for a loud speaker 11FL in the television receiver 1.
Right front channels audio signal R and center channel audio signal C from 5.1 channel decoding devices 302 are synthetic by synthesizer 304, and export the composite signal (R+C) of gained to audio output 308 by amplifier 306.Then, the audio signal that exports audio output 308 to is provided for another loud speaker 11FR in the television receiver 1.
Amplifier 305 and 306 has and is used to the mute function that makes its audio signal output quiet, and makes its audio signal output quiet in response to the mute signal that comes the input-output interface 107 in the self-controller 100.
When according to the first embodiment of the present invention during from television receiver 1 received audio signal Au1, the audio signal of being reproduced by television receiver 1 is from loud speaker 11FL and 11FR output.Amplifier 305 and 306 is muted and is controlled to the loud speaker 11FL and the 11FR that will not offer from the audio signal of audio signal output device 3 in the television receiver 1.
When from DVD player 2 received audio signal Au2, amplifier 305 and 306 is not muted control, thereby allows loud speaker 11FL and the 11FR of this audio signal output to the television receiver 1.
Replace the quiet control of pair amplifier 305 and 306,5.1 channel decoding devices 302 can not exported left front and right front channels audio signal L and R and center channel audio signal C during decoding is from the audio signal of television receiver 1.The control signal that is used for this operation can provide from input-output interface 106.
Be provided for rear transfer function convolution circuit 310 through the left back and right back channel audio signal RL of 5.1 channel decoding devices 302 decoding and RR as the virtual sound source process device.
Use digital filter, rear transfer function convolution circuit 310 will be from the left back and right back channel audio signal RL and RR and the relevant rear of the head transfer function convolution of being prepared by the relevant rear of head transfer function storage 111 of 5.1 channel decoding devices 302.
If input audio signal is not a digital signal, then rear transfer function convolution circuit 310 converts input audio signal to digital signal, with the relevant rear with head of this digital signal transfer function convolution, and will return analog signal through the conversion of signals of convolution.
The relevant rear of head transfer function is measured as described below, is stored in then in the relevant rear of the head transfer function storage 111.Fig. 8 illustrates how to measure the relevant rear of head transfer function.
As shown in Figure 8, L channel mensuration microphone 41 and R channel mensuration microphone 42 are placed near listener 4 the left ear and auris dextra.Left back channel loudspeaker 11RL is placed in listener 4 back and expects the position that left back channel loudspeaker 11RL is installed usually.For example, then, measure microphone 42 by L channel mensuration microphone 41 and R channel and pick up the sound that sends in response to the pulse ear by left back channel loudspeaker 11RL.From the left ear of sonic measurements from left back channel loudspeaker 11RL to listener 4 and the transfer function of auris dextra (the relevant rear of the head of left back sound channel transfer function) of being picked up.
Similarly, the sound that is sent in response to pulse by right back channel loudspeaker 11RR is picked up by microphone 41 and 42.From the left ear of sonic measurements from right back channel loudspeaker 11RR to listener 4 and the transfer function of auris dextra (the relevant rear of the head of right back sound channel transfer function) of being picked up.
In plan view, back loud speaker RL is positioned at from listener 4 front and back vertical line and turns clockwise on the lines of 30 degree about 2 meters of listener 4 back distance, and then loud speaker RR is positioned in a plan view from listener 4 front and back vertical line and is rotated counterclockwise on the lines of 30 degree about 2 meters of listener 4 back distance.Use this that transfer function of measuring from each loud speaker to each ear is set.
Transfer function is further discussed.Be called as transfer function A from the left back to the transfer function of left ear.The transfer function of being measured near the loud speaker 11SW1 the ear to microphone 41 is called as transfer function B.Multiply by at transfer function B and to determine transfer function X under the prerequisite that transfer function X obtains transfer function A.If offer signal and the determined transfer function X convolution of nearly loud speaker 11SW1, then to sound just look like that this sound is from 2 meters of listener 4 back to the sound that sends from loud speaker 11SW1.
Not necessarily need to determine transfer function X.Sometimes possibility transfer function A is just enough.In above discussion, single transfer function has been discussed.In practice, as shown in Figure 8, use a plurality of transfer functions.
The relevant rear of head transfer function is stored in the relevant rear of the head transfer function storage 111.The relevant rear of head transfer function offers rear transfer function convolution circuit 310 by input-output interface 108 then, and is used for left back and right back channel audio signal RL and the relevant rear with head of RR transfer function convolution.When rear transfer function convolution circuit 310 respectively to being arranged on when the very near loud speaker 11SW1 of listener 4 ears and 11SW2 provide left back and right back channel audio signal RL* and RR*, listener 4 can just look like that he hears the same sound of hearing from loud speaker 11SW1 and 11SW2 of sound from left back and right back channel loudspeaker 11RL and 11RR.
The level of the signal that provides to left back and right back channel loudspeaker 11RL and 11RR can be provided the level of the left back and right back channel audio signal RL of virtual acoustic imaging and each among the RR.This is because loud speaker 11SW1 and 11SW2 are arranged near listener 4 the ears.
More than handle and be called virtual sound source process again, because the sound of hearing as the result of above-mentioned head related transfer function convolution just looks like to send from virtual speaker.
In this way, back transfer function convolution circuit 310 provides the left back and right back channel audio signal RL* and the RR* of virtual acoustic imaging respectively to synthesizer 311 and 312.Provide low-frequency audio signal LFE to synthesizer 311 and 312 from 5.1 channel decoding devices 302.Output audio signal from synthesizer 311 and 312 exports audio output 315 and 316 to by amplifier 313 and 314 respectively.
Audio output 315 with 316 respectively with the ears that place listener 4 near loud speaker 11SW1 be connected with 11SW2.Loud speaker 11SW1 and 11SW2 as subwoofer reproduce the left back and right back channel audio signal RL* and the RR* of low-frequency audio signal LFE and reproducing virtual sound imaging simultaneously.
Audio signal Au1 from television receiver 1 is used for audio reproduction by 302 decodings of 5.1 channel decoding devices.In this case, should note comprising left back and left back channel sound from the sound of loud speaker 11FL and 11FR output.
More specifically, the acoustic image of the left back and right back channel sound of near loud speaker 11SW1 the ears that are arranged on listener 4 and 11SW2 output is located the influence of the left back and right back channel sound that is comprised in the sound that the loud speaker 11FL that may be subjected to from television receiver 1 and 11FR send.
According to first embodiment, loud speaker 11SW1 and 11SW2 are set near listener 4 the ears, and be therefore much closer from listener 4 ears than loud speaker 11FL in the television receiver 1 and 11FR.The sound that sends from loud speaker 11SW1 and the 11SW2 recently sound of the loud speaker 11FL from television receiver 1 and 11FR arrives listener 4 and wants early manyly.
According to Haas (Haas) effect, 4 of listeners will listen as rear sound from the sound of loud speaker 11SW1 and 11SW2.Therefore needn't remove left back and right back channel audio signal from the audio signal of loud speaker 11FL offering television receiver 1 and 11FR.
Not shown in Figure 7 to the voice frequency signalling system of assisting subwoofer 11SW3 and 11SW4 to provide.As previously mentioned, can only provide low-frequency audio signal LFE to auxiliary subwoofer 11SW3 and 11SW4.Randomly, except low-frequency audio signal LFE, can also provide left back and right back channel audio signal RL and RR to auxiliary subwoofer 11SW3 and 11SW4.
Audio reproducing system according to first embodiment on the chair 20 that multi-channel loudspeaker is installed on Fig. 5, be sitting in listener 4 on the chair 20 and can use the loud speaker of the number that lacks than channel number to enjoy high volume level and be imbued with the multi-channel sound of presence, reduced the sound leakage of environment towards periphery simultaneously significantly.
According to first embodiment, be unkitted in the cartonning and the subwoofer 11SW1 and the 11SW2 that are arranged near listener 4 the ears have reduced the leakage of strong low-frequency sound to next room significantly.Left back and the right back channel sound of the loud speaker beyond the subwoofer is by the virtual acoustic imaging, then from loud speaker 11SW1 and 11SW2 output.Low level audio signal thereby feasible.Not only low-frequency sound but also other frequency sound by with its towards periphery the leakage degree controlled way of environment reproduce.Even listener 4 also can enjoy DVD to the full at midnight, and needn't worry other people.
Because loud speaker 11SW1 and 11SW2 are set near listener 4 the ears, so sound output can be reduced to about 1/100 of known technology.This has realized energy-conservation and has reduced the related cost of hardware (for example output amplifier).Because little sound output is feasible, so loud speaker does not need very big stroke.Loud speaker frivolous and low-cost design is just much of that.Use little sound output to reduce heating, thereby allow to use the power supply of compact design.Can also be battery-operated.This device can embed in the chair.
The audio reproducing system of the first embodiment of the present invention can save energy usually and the satisfaction degree that do not reduce listener 4 has reduced the noise of the surrounding environment that leaks simultaneously.
Typical soundproof window is the about 45dB of the sound attenuating of 5kHz, about 36dB of 1kHz, and 100Hz drop to 20bB.Below 100Hz, the degree of decay of sound reduces.The sound insulation validity of the effective sex ratio soundproof window of the sound insulation of subwoofer is much remarkable.When considering if the user makes the room deafening just all the more so when enjoying the related cost of audio-video content.
According to the first embodiment of the present invention, when using DVD player 2, audio signal Au2 offers loud speaker 11FL and 11FR in the television receiver 1 by audio signal output device 3.During as the receiving digital broadcast program, can provide from the audio signal Au2 of DVD player 2 is feasible to television receiver 1 and export the sound that comprises 5.1 channel sound from loud speaker 11FL and 11FR.In this operation, the audio signal wire that extends to loud speaker 11FL and 11FR from audio signal output device 3 becomes and there is no need.
Audio signal output device 3 may be installed in the precalculated position under the seat surface of chair 20.In this installation, audio signal output device 3 can receive from the audio signal Au2 as one of the television receiver 1 in the source of multi-channel audio signal and DVD player 2 by signal cable.Signal cable extends between chair 20 and one of television receiver 1 and DVD player 2.By in DVD player 2, being provided for coming the device of wireless transmission multi-channel audio signal and in audio signal output device 3, being provided for coming the receiver of wireless receiving multi-channel audio signal can eliminate signal cable between chair 20 and one of television receiver 1 and DVD player 2 by radio wave or light by radio wave or light.
When multi-channel audio signal with the form of radio wave or light when exporting such as multichannel audio sources such as DVD player 2, it is wireless that the link between DVD player 2 and the audio reproducing system becomes, and chair 20 can move freely.
Second embodiment
According to the first embodiment of the present invention, left front and right front channels loud speaker is loud speaker 11FL and the 11FR in the television receiver 1.As a comparison, audio reproducing system according to a second embodiment of the present invention, left front is two loud speaker 51FL and 51FR that separate with the right front channels loud speaker.
As shown in Figure 9, loud speaker 51FL comprises loudspeaker enclosure 52FL and the loudspeaker unit 53FL among the loudspeaker enclosure 52FL of packing into.Loudspeaker unit 53FL is fixed in the front panel as its sound panel of loudspeaker enclosure 52FL.Loud speaker 51FR comprises loudspeaker enclosure 52FR and the loudspeaker unit 53FR among the loudspeaker enclosure 52FR of packing into.Loudspeaker unit 53FR is fixed in the front panel as its sound panel of loudspeaker enclosure 52FR.
According to second embodiment, be provided for the display monitor 15 that separates with loud speaker rather than offer television receiver 1 from the vision signal Vi of DVD player 2, and be displayed on the display screen 15D of display monitor 15.
Two loud speaker 51FL and 51FR can be installed on any position.According to second embodiment, as shown in figure 10, loud speaker 51FL and 51FR are installed on the chair 20.
According to second embodiment, left front channel loudspeaker 51FL is installed on the end of the arm 24L that is adorned on the left handrail 23L that is removably mounted on chair 20.Left side handrail 23L comprises and allows the removably installed part (not shown) of supporting arm 24L.Arm 24L at one end bearing loud speaker 51FL is installed in installed part, thereby is fixed in chair 20.Loud speaker 51FL is oriented to not hinder the position in the listener's 4 who is watching the video on the display screen the visual field.
Right front channels loud speaker 51FR (not shown) is installed on an end of arm similarly.This arm is connected with the installed part of the right handrail of chair 20.
According to second embodiment, the audio signal output device 3 of Fig. 3 does not need input selector switch 301.The quiet controlled function that does not also need pair amplifier 305 and 306.The audio signal that exports audio output 307 and 308 to is offered left front respectively and right front channels loud speaker 51FL and 51FR.
The remainder of second embodiment is identical with first embodiment.
According to second embodiment, it is relative nearer that left front and right front channels loud speaker 51FL and 51FR are configured to from listener 4, and feasible from the volume level of sound low among loud speaker 11FL among ratio first embodiment of loud speaker 51FL and 51FR and the 11FR.Therefore, the audio reproducing system of second embodiment more can play deadening.
The 3rd embodiment
According to first and second embodiment, the left back and right back channel audio signal of audio reproducing system virtual acoustic imaging, thus allow to reduce the loud speaker number that uses, and realize sound insulation.Even back loud speaker is placed in close relatively listener 4 places, surrounding effect and low noise figure can not degenerated yet.
A third embodiment in accordance with the invention, real back loud speaker is set near the listener 4.The audio signal that will provide to left front and right front channels loud speaker is by the virtual acoustic imaging, is provided for two loud speaker 11SW1 and 11SW2 near the ears that place listener 4 then.Left front and two loud speakers of right front channels thereby be eliminated.
Figure 11 illustrates the audio reproducing system of the third embodiment of the present invention.Like that, be provided for display monitor 15 so that corresponding video is presented on the display screen 15D among second embodiment as shown in Figure 11 from the vision signal Vi of DVD player 2.
Not only place near listener 4 the ears, and two loud speaker 61RL of left back and right back sound channel and 61RR also place near listener 4 the ears as the loud speaker 11SW1 of subwoofer and 11SW2.As shown in figure 11, loud speaker 61RL comprises little loudspeaker enclosure 62RL and the left rear speaker unit 63RL among the loudspeaker enclosure 62RL of packing into.Loudspeaker unit 63RL is fixed in the front panel as its sound panel of loudspeaker enclosure 62RL.Loud speaker 61RR comprises little loudspeaker enclosure 62RR and the right rear loudspeakers unit 63RR among the loudspeaker enclosure 62RR of packing into.Loudspeaker unit 63RR is fixed in the front panel as its sound panel of loudspeaker enclosure 62RR.
Provide audio signal Au2 from DVD player 2 to 3 of audio output devices.Left back and right back channel audio signal RL and RR that audio signal output device 3 the low-frequency audio signal LFE that will provide to subwoofer 11SW1 and 11SW2 (depend on setting in addition will to auxiliary subwoofer 11SW3 and 11SW4) is provided respectively and will provides to left back and right back channel loudspeaker 61RL and 61RR.Audio signal output device 3 is imaged as audio signal FL* and FR* with left front with right front channels audio signal L and R virtual acoustic, and provides audio signal FL* and FR* to subwoofer 11SW1 and 11SW2 respectively.Center channel audio signal C is synthesized to will be by among the left front of virtual acoustic imaging and right front channels audio signal L and the R each.
The loud speaker that Figure 12 illustrates the third embodiment of the present invention is provided with configuration.According to the 3rd embodiment, as represented by solid outline, real loud speaker comprises near two subwoofer 11SW1 and 11SW2 and left back and right latter two loud speaker 61RL and the 61RR the ears that place listener 4.As previously mentioned, not only loud speaker 11SW1 and 11SW2, left back and right back channel loudspeaker 61RL and 61RR also with the listener separate approximate 20cm apart from dsw.
As shown in figure 12, do not adopt center channel loud speaker 11C and left front and right front channels loud speaker 11FL and the 11FR that represents by dotted outline.The audio signal that will provide to these loud speakers is offered loud speaker 11SW1 and 11SW2 then by the virtual acoustic imaging.These loud speakers become to make listener 4 feel as if that loud speaker exists as dotted line is represented with audio reproduction.
The center channel audio signal is added into left front and the right front channels audio signal, and wherein combination has the left front of center channel audio signal and right front channels audio signal by the virtual acoustic imaging.Listener 4 feels as if that he hears the center channel audio frequency from the position of the represented center channel loud speaker 11C of dotted line.
The same with first and second embodiment of the present invention, the 3rd embodiment can be applied to the structure of massage armchair.Below this application is described.
Figure 13 illustrates the audio reproducing system that is installed in the 3rd embodiment on the chair 20.Except subwoofer 11SW1 and 11SW2, also left back and right back channel loudspeaker 61RL and 61RR are installed on the chair 20.Omit its discussion with key element identical among first embodiment with identical label appointment and at this.
Shown in Figure 13 and 14A and 14B, left back and right back channel loudspeaker 61RL and 61RR are installed in speaker retainer 22 with subwoofer 11SW1 and 11SW2.Specifically, in plan view, left back and right back channel loudspeaker 61RL and 61RR are by with in listener 4 front and back vertical line is supported on the space that the flat, annular structure by the speaker retainer 22 of listener 4 head back limited with becoming respective angles.
As among first embodiment, auxiliary subwoofer 11SW3 and 11SW4 have been installed also.
When listener 4 was sitting on the chair 20, the distance between listener 4 head (or ears) and corresponding subwoofer 11SW1 to 11SW4 and loud speaker 11RL and the 11RR was about 20cm.
Figure 15 is the block diagram of the audio signal output device 3 of a third embodiment in accordance with the invention.The same with the audio signal output device 3 of first embodiment, the audio signal output device 3 of the 3rd embodiment comprises audio signal processor 300 and controller 100.
The controller 100 of the 3rd embodiment is to use transfer function storage 112 of the relevant the place ahead of head rather than the relevant rear of head transfer function storage 111 with the difference of the controller 100 of first embodiment.The remainder of controller 100 is identical with the controller 100 of first embodiment.
Eliminated the input selector switch 301 of first embodiment in the audio signal processor 300 of the 3rd embodiment.As among first embodiment, the audio signal processor 300 of the 3rd embodiment comprises the rear transfer function convolution circuit 310 among 5.1 channel decoding devices 302 and the place ahead transfer function convolution circuit 320 rather than first embodiment.
When the audio signal Au2 that receives from DVD player 2,5.1 302 couples of audio signal Au2 of channel decoding device decode, thereby export left front and right front channels audio signal L and R, center channel audio signal C, left back and right back channel audio signal RL and RR and low-frequency audio signal LFE.
Left front channel audio signal L and center channel audio signal C from 5.1 channel decoding devices 302 synthesize synthesized output signal (L+C) by synthesizer 303.This synthesized output signal is provided for the place ahead transfer function convolution circuit 320 as the virtual sound source process device then.Right front channels audio signal R and center channel audio signal C from 5.1 channel decoding devices 302 synthesize synthesized output signal (R+C) by synthesizer 304.Then, this synthesized output signal is provided for the place ahead transfer function convolution circuit 320.
The structure of the place ahead transfer function convolution circuit 320 is identical with rear transfer function convolution circuit 310.Use digital filter, the place ahead transfer function convolution circuit 320 will from the audio signal of synthesizer 303 and synthesizer 304 be pre-stored in the relevant the place ahead of head transfer function and store head related transfer function convolution on 112.
If input audio signal is not a digital signal, then the place ahead transfer function convolution circuit 320 converts input audio signal to digital signal, with the relevant the place ahead with head of this digital signal transfer function convolution, and the conversion of signals after the convolution is returned analog signal.
The relevant anterior transfer function of head is measured as described below, is stored in then in the relevant anterior transfer function storage 112 of head.Figure 16 illustrates how to measure the relevant the place ahead of head transfer function.
As shown in figure 16, L channel mensuration microphone 41 and R channel mensuration microphone 42 are placed in respectively near listener 4 the left ear and auris dextra.Left front channel loudspeaker 11FL is placed in listener 4 fronts and expects the position that left front channel loudspeaker 11FL is installed usually.For example, then, measure microphone 42 by L channel mensuration microphone 41 and R channel and pick up the sound that sends in response to pulse by left front channel loudspeaker 11FL.From the left ear of sonic measurements from left front channel loudspeaker 11FL to listener 4 and the transfer function of auris dextra (the relevant the place ahead of the head of left front sound channel transfer function) of being picked up.
Similarly, the sound that is sent in response to pulse by right front channels loud speaker 11FR is picked up by microphone 41 and 42.From the left ear of sonic measurements from right front channels loud speaker 11FR to listener 4 and the transfer function of auris dextra (the relevant the place ahead of the head of right front channels transfer function) of being picked up.
Loud speaker FL is positioned at from listener 4 front and back vertical line and is rotated counterclockwise on the lines of 30 degree about 2 meters of listener 4 fronts distance before in plan view, and loud speaker FR is positioned at from listener 4 front and back vertical line and turns clockwise on the lines of 30 degree about 2 meters of listener 4 fronts distance before in plan view.Use this that transfer function of measuring from each loud speaker to each ear is set.
Transfer function is further discussed.As shown in Figure 16, be called as transfer function A from the left front to the transfer function of left ear.The transfer function of being measured near the loud speaker 11SW1 the ear to microphone 41 is called as transfer function B.Multiply by at transfer function B and to determine transfer function X under the prerequisite that transfer function X obtains transfer function A.If offer signal and the determined transfer function X convolution of nearly loud speaker 11SW1, then the sound perception of sending from loud speaker 11SW1 seems that this sound is from 2 meters of listener 4 left fronts.
Not necessarily need to determine transfer function X.Sometimes possibility transfer function A is just enough.In above discussion, single transfer function has been discussed.In practice, in Figure 16, use a plurality of transfer functions.
The relevant the place ahead of head transfer function is stored in the relevant the place ahead of head transfer function storage 112.The place ahead transfer function convolution circuit 320 is with the relevant the place ahead with the head that provides by input-output port one 09 of audio signal transfer function convolution.The imagings of the place ahead transfer function convolution circuit 320 output virtual acoustic with the synthetic left front channel audio signal FL* of center channel audio signal C and the right front channels audio signal FR* synthetic of virtual acoustic imaging with center channel audio signal C.
The place ahead transfer function convolution circuit 320 near loud speaker 11SW1 and the 11SW2 the ears that place listener 4 provide audio signal (FL*+C) and (FR*+C).Listener 4 sensation seems to send from left front and right front channels loud speaker 11FL and 11FR from the sound of loud speaker 11SW1 and 11SW2 output, and seems that center channel sound sends from center loudspeaker.
The signal level that provides to left back and right back channel loudspeaker 11RL and 11RR can be provided for audio signal (FL*+C) and level (FR*+C), because loud speaker 11SW1 and 11SW2 are placed near listener 4 the ears.
In this way, the place ahead transfer function convolution circuit 320 provides the audio signal (FL*+C) of virtual acoustic imaging and (FR*+C) to synthesizer 321 and 322 respectively.Provide low-frequency audio signal LFE to synthesizer 321 and 322 from 5.1 channel decoding devices 302.Output audio signal from synthesizer 321 and 322 exports audio output 315 and 316 to by amplifier 323 and 324 respectively.
Audio output 315 is connected with 11SW2 with near the subwoofer 11SW1 of the ears that place listener 4 with 316.As subwoofer, loud speaker 11SW1 and 11SW2 reproduce low-frequency audio signal LFE and go back the audio signal (FL*+C) of reproducing virtual sound imaging and (FR*+C) simultaneously.
Not shown in Figure 15 to the voice frequency signalling system of assisting subwoofer 11SW3 and 11SW4 to provide.As previously mentioned, can only provide low-frequency audio signal LFE to auxiliary subwoofer 11SW3 and 11SW4.Randomly, except low-frequency audio signal LFE, can also provide the audio signal (FL*+C) of virtual acoustic imaging and (FR*+C) to auxiliary subwoofer 11SW3 and 11SW4.
According to the 3rd embodiment, export audio output 327 and 328 to by amplifier 325 and 326 respectively from the left back and right back channel audio signal RL of 5.1 channel decoding devices 302 and RR.Therefore, left back and right back channel audio signal RL and RR are respectively by exporting with form of sound with left back and right back channel loudspeaker 61RL and 61RR that audio signal terminal 327 is connected with 328.
Because according to the 3rd embodiment, left back and right back channel loudspeaker 61RL and 61RR are placed near listener 4 the ears, so feasible to its low level left back and right back channel audio signal RL and RR that provides.
As among first and second embodiment, according to the 3rd embodiment, listener 4 can use the loud speaker of the number that lacks than channel number to enjoy high volume level and be imbued with the multi-channel sound of presence, has reduced the sound leakage of environment towards periphery simultaneously significantly.This audio reproducing system is also realized energy-conservation.
According to the 3rd embodiment, audio reproducing system does not adopt preceding loud speaker, and audio signal is offered near loud speaker 11SW1 and the 11SW2 of ears that places listener 4 then by the virtual acoustic imaging.This has further reduced the acoustical leakage of environment towards periphery.
The 4th embodiment
According to the 4th embodiment,, make the maximization of sound insulation and energy-efficient performance by allowing to export whole 5.1 sound channels around sound near two loud speaker 11SW1 the ear that places listener 4 and 11SW2.
Figure 17 illustrates the audio reproducing system of a fourth embodiment in accordance with the invention.As shown in figure 17, as among the second and the 3rd embodiment, be provided for display monitor 15 so that video is presented on the display screen 15D from the vision signal Vi of DVD player 2.
Have only subwoofer 11SW1 and 11SW2 place listener 4 near.
Audio signal output device 3 receives only the audio signal Au2 from DVD player 2.In response to audio signal Au2, audio signal output device 3 generates will be to subwoofer 11SW1 and 11SW2 (depend on setting in addition will to auxiliary subwoofer 11SW3 and 11SW4) the low-frequency audio signal LFE that provides, left front and right front channels audio signal FL and FR and left back and right back channel audio signal RL and RR.Audio signal output device 3 is also with each the signal-virtual sound imaging that is generated, and the signal with the virtual acoustic imaging offers subwoofer 11SW1 and 11SW2 then.Center channel audio signal C is by with synthetic by among the left front of virtual acoustic imaging and right front channels audio signal L and the R each.
The loud speaker that Figure 18 illustrates the 4th embodiment is provided with configuration.According to the 4th embodiment, near two loud speaker 11SW1 the ears that place listener 4 that the loud speaker of use is only represented by solid outline and 11SW2.
Do not use the center channel loud speaker 11C that represents by dotted outline, left front and right front channels loud speaker 11FL and 11FR and left back and right back channel loudspeaker 11RL and 11RR.The audio signal that will provide to these loud speakers is offered loud speaker 11SW1 and 11SW2 then practically by the virtual acoustic imaging.Listener 4 feels as if that these sound are that the loud speaker of the position represented by dotted outline sends.
The center channel audio signal is added in the left front and right front channels audio signal.Left front and the right front channels audio signal of wherein having synthesized the center channel audio signal is by the virtual acoustic imaging.As represented by the dotted line among Figure 18, listener 4 hear virtually the center channel audio signal just look like corresponding sound be send from the position of central channel loudspeaker 11C the same.
According to the 4th embodiment, shown in Fig. 5 and Fig. 6 A and the 6B, loud speaker 11SW1 and 11SW2 (depend on to be provided with and also have auxiliary subwoofer 11SW3 and 11SW4) can be installed on the chair 20 as the front.
Figure 19 is the block diagram of the audio signal output device 3 of a fourth embodiment in accordance with the invention.The same with the audio signal output device 3 of the embodiment of front, the audio signal output device 3 of the 4th embodiment also comprises audio signal processor 300 and the controller of being made up of microcomputer 100.
The controller 100 of the 4th embodiment is also to comprise the relevant the place ahead of head transfer function storage 112 except the relevant rear of head transfer function storage 111 with the difference of the controller 100 of first embodiment, also is also to comprise in addition input-output port one 09.The controller 100 of the remainder of controller 100 and first embodiment much at one.
The input selector switch 301 that does not comprise first embodiment in the audio signal processor 300 of the 4th embodiment.Also comprise the rear transfer function convolution circuit 310 of 5.1 channel decoding devices 302, first embodiment and the place ahead transfer function convolution circuit 320 of the 3rd embodiment etc. in the audio signal processor 300 of the 4th embodiment.
When the audio signal Au2 that receives from DVD player 2,5.1 302 couples of audio signal Au2 of channel decoding device decode, thereby generate left front and right front channels audio signal L and R, center channel audio signal C, left back and right back channel audio signal RL and RR and low-frequency audio signal LFE.
With the same among the 3rd embodiment, synthetic from the left front channel audio signal L and the center channel audio signal C of 5.1 channel decoding devices 302 by synthesizer 303, and synthetic output audio signal (L+C) is provided for the place ahead transfer function convolution circuit 320.Synthetic and synthetic output audio signal (R+C) is provided for the place ahead transfer function convolution circuit 320 by synthesizer 304 from the right front channels audio signal R of 5.1 channel decoding devices 302 and center channel audio signal C.
With the same among first embodiment, be provided for rear transfer function convolution circuit 310 as the virtual sound source process device from the left back and right back channel audio signal RL of 5.1 channel decoding devices 302 and RR.
The relevant rear of the relevant rear of head transfer function storage 111 storage heads transfer function is discussed in conjunction with first embodiment as reference Fig. 8.Being stored in the relevant rear of head transfer function in the relevant rear of the head transfer function storage 111 is read and offers rear transfer function convolution circuit 310 by input-output interface 108.Rear transfer function convolution circuit 310 will be from the relevant rear with head of the left back and right back sound channel signal transfer function convolution of 5.1 channel decoding devices 302.
The relevant the place ahead of the relevant the place ahead of head transfer function storage 112 storage heads transfer function is discussed in conjunction with the 3rd embodiment as reference Figure 16.Being stored in the relevant the place ahead of head transfer function in the relevant the place ahead of head transfer function storage 112 is read and offers the place ahead transfer function convolution circuit 320 by input-output port one 09.The place ahead transfer function convolution circuit 320 will be from each transfer function convolution of relevant the place ahead with head of synthesizer 303 and 304 the left front and right front channels signal that has wherein synthesized center channel audio signal C.
Synthesizer 321 will be from the virtual acoustic imaging of the place ahead transfer function convolution circuit 320 synthetic with the synthetic left front channel audio signal of center channel audio signal C with low-frequency audio signal LFE from 5.1 channel decoding devices 302.Then, composite signal is provided for synthesizer 331.Synthesizer 331 is synthetic with the left back channel audio signal from the virtual acoustic imaging of rear transfer function convolution circuit 310 with this composite signal.The composite signal that obtains from synthesizer 331 offers loud speaker 11SW1 by amplifier 333 and audio output 335.
What similarly, synthesizer 322 will be from the virtual acoustic imaging of the place ahead transfer function convolution circuit 320 is synthetic with the low-frequency audio signal LFE from 5.1 channel decoding devices 302 with the synthetic right front channels audio signal of center channel audio signal C.Then, composite signal is provided for synthesizer 332.Synthesizer 332 is synthetic with the right back channel audio signal from the virtual acoustic imaging of rear transfer function convolution circuit 310 with this composite signal.The composite signal that obtains from synthesizer 332 offers loud speaker 11SW2 by amplifier 334 and audio output 336.
Subwoofer 11SW1 and 11SW2 reproduce the place ahead audio signal (FL*+C) of low-frequency audio signal LFE and reproducing virtual sound imaging simultaneously and (FR*+C) with the rear audio signal RL* and the RR* of virtual acoustic imaging.
The not shown voice frequency signalling system that will provide to auxiliary subwoofer 11SW3 and 11SW4 among Figure 19.As previously mentioned, can only provide low-frequency audio signal LFE to auxiliary subwoofer 11SW3 and 11SW4.In addition, except low-frequency audio signal LFE, can also provide the audio signal (FL*+C) of virtual acoustic imaging and (FR*+C) or the rear audio signal RL* and the RR* of virtual acoustic imaging to auxiliary subwoofer 11SW3 and 11SW4.
According to the 4th embodiment, listener 4 can only enjoy high volume level with near loud speaker 11SW1 the ears that place listener 4 and 11SW2 and be imbued with the multi-channel sound of presence, significantly reduces the acoustical leakage of environment towards periphery simultaneously.This audio reproducing system is also realized energy-conservation.
Other embodiment
According to the foregoing description, loud speaker is installed in and makes on the chair that loud speaker is near listener 4 ears when listener 4 is sitting on the chair.Near the mechanism that loud speaker is arranged at listener 4 the ears is not limited to chair.
According to the foregoing description, the speaker retainer supporting of being fixed in chair is not included in the loudspeaker enclosure and is not fixed in the subwoofer 11SW1 of sound panel and the loudspeaker unit of 11SW2.Speaker retainer not necessarily will be fixed in chair.
Figure 20 and 21 illustrates as the supporting loud speaker 11SW1 that is made by aluminum pipe among the above-mentioned embodiment and two speaker retainer of 11SW2.This speaker retainer removably is connected to chair with loud speaker 11SW1 and 11SW2.
As shown in figure 20, loud speaker 11SW1 and 11SW2 are individually fixed on the both sides of T shape arm 72a of speaker retainer 72.Loud speaker 11SW1 and 11SW2 are installed on the speaker retainer 72 the opposed facing mode of vibrating diaphragm face with it with keeping preset distance betwixt.
In this case, the distance between the vibrating diaphragm surface of the vibrating diaphragm of first loud speaker 11SW1 surface and the second loud speaker 11SW2 be configured to head as listener 4 listener 4 ears and loud speaker 11SW1 and 11SW2 are accordingly separated combine Fig. 2 discussion apart from dsw.
The center arm 72b of speaker retainer 72 is inserted among the speaker retainer groove 71a that is arranged in the chair 71.Thereby center arm 72b is fixed in chair 71 with speaker retainer 72.
The speaker retainer groove 71a of chair 71 roughly aligns center arm 72b when being sitting on the chair 71 as listener 4 with listener 4 center line mode is arranged at the core at the back of chair 71.
When listener 4 usefulness loud speaker 11SW1 and 11SW2 come enjoy music as shown in figure 20, loud speaker 11SW1 and 11SW2 are installed on the chair 71 thereby listener 4 inserts speaker retainer groove 71a with the center arm 72b of speaker retainer 72.
When listener 4 was sitting on the chair 71 as shown in figure 20, loud speaker 11SW1 and 11SW2 were arranged near listener 4 the ears with keeping preset distance betwixt.The low-frequency sound of low-frequency sound even low sound level can reproduce with enough volume, and the noise that leaks into surrounding environment still less.
As shown in figure 21, loud speaker 11SW1 and 11SW2 are individually fixed in speaker retainer 731 and speaker retainer 732.Speaker retainer groove 71b is set on close listener 4 the side of a side shoulder at the back of chair 71 when listener 4 is sitting on the chair 71.Speaker retainer groove 71b accommodates speaker retainer 731.Speaker retainer groove 71c is set on the opposite side of the close listener's 4 at the back of chair 71 opposite side shoulder when listener 4 is sitting on the chair 71.Speaker retainer groove 71c accommodates speaker retainer 732.
When listener 4 usefulness loud speaker 11SW1 and 11SW2 listened to music as shown in figure 21, listener 4 inserted speaker retainer 731 among the speaker retainer groove 71b of chair 71, and speaker retainer 732 is inserted among the speaker retainer groove 71c of chair 71.Thereby loud speaker 11SW1 and 11SW2 are installed on the chair 71.
Speaker retainer 731 and 732 is installed on the chair 71 as illustrated in fig. 21.Distance between the vibrating diaphragm surface of the vibrating diaphragm of loud speaker 11SW1 surface and loud speaker 11SW2 be configured to head as listener 4 make between loud speaker 11SW1 and 11SW2 the time listener 4 ears and accordingly the distance between loud speaker 11SW1 and the 11SW2 be described apart from dsw with reference to Fig. 2.
When listener 4 was sitting on the chair 71 as shown in figure 21, loud speaker 11SW1 and 11SW2 were set near listener 4 the ears and keep predetermined distance d sw therebetween.The low-frequency sound of low-frequency sound even low sound level can reproduce with enough volume, and the noise that leaks into surrounding environment still less.
Referring to Figure 20 and 21, between the operating period, speaker retainer 72 or speaker retainer 731 and 732 can be removed in standard, and loud speaker 11SW1 and 11SW2 can not block the user and the easy operating of chair 71.
The application of loud speaker 11SW1 and 11SW2 is not limited to above-mentioned chair.
Figure 22 illustrates loud speaker 11SW1 and the 11SW2 by speaker retainer 74 supportings.As shown in the figure, supporting mutually in the face of and the speaker retainer 74 of the loud speaker 11SW1 of the maintenance distance identical and 11SW2 with distance shown in Figure 20 and 21 by suspension member 75 suspensions from the roof.
As shown in figure 22, the length from the suspension member on roof is adjustable (though this mechanism is not illustrated).By regulating the length of suspension member 75, loud speaker 11SW1 and 11SW2 are set near listener 4 the ears, and allow that when listener 4 is sitting on the chair 71 predetermined distance d sw is arranged therebetween.
Figure 23 illustrates loud speaker 11SW1 and the 11SW2 by 76 supportings of self speaker retainer.Speaker retainer 76 supportings keep opposed facing loud speaker 11SW1 in preset distance ground and 11SW2 therebetween shown in Figure 20 and 21.
Figure 24 illustrates respectively by loud speaker 11SW1 and the 11SW2 of self speaker retainer 771 and 772 to support with the mechanism of Figure 23 similar mode.As shown in figure 24, loud speaker 11SW1 and 11SW2 are respectively by self speaker retainer 771 and 772 supportings.
Referring to Figure 23, if speaker retainer 76 is correctly placed about listener 4, then loud speaker 11SW1 and 11SW2 are also correctly placed shown in Figure 20 and 21.
Referring to Figure 24, speaker retainer 771 and 772 is separated from each other fully.Listener 4 can be placed on self speaker retainer 771 and 772 any position easily.
Figure 25 illustrates loud speaker 11SW1 and the 11SW2 by speaker retainer 78 supportings.Speaker retainer 78 supportings of being fixed in wall 79 keep opposed facing loud speaker 11SW1 in preset distance ground and 11SW2 therebetween shown in Figure 20 and 21.
As shown in figure 25, the distance between loud speaker 11SW1 and the 11SW2 is fixed to be similar to mode shown in Figure 23 by speaker retainer 78, and listener 4 only need with his head be placed between loud speaker 11SW1 and the 11SW2 in the heart.
Figure 26 A and 26B illustrate the speaker retainer 83 that is releasably attached on the chair 71.Shown in Figure 26 A, steel plate is embedded into the inside at the back 81 of chair 71.
Speaker retainer 83 supports keep at a distance opposed facing loud speaker 11SW1 in ground and 11SW2 therebetween shown in Figure 20 and 21.Speaker retainer 83 has and its magnet unit 84 with bolt.Speaker retainer 83 is adsorbed in the steel plate 82 in the back 81 that embeds chair 71 with magnet unit 84 by magnetic force mode is fixed in the back 81 of chair 71.
Shown in Figure 26 A and 26B, 4 need of listener be sitting in can make him on the chair 71 head between loud speaker 11SW1 and 11SW2.
Subwoofer 11SW1 and the 11SW2 example with respect to listener 4 setting has been discussed.The present invention can be applicable to the situation that many people listen to the music simultaneously.Figure 27 to 30 illustrates this set example of loud speaker 11SW1 and 11SW2 under the situation of a plurality of listener's enjoy music.
Figure 27 and Figure 28 A to 28C illustrate near the audio reproducing system the ear that loud speaker is placed in two listener 4A and 4B.Here the application that example is the example of Figure 26 A and 26B is set.
Referring to Figure 27, speaker retainer 85 supportings of being made by aluminum pipe are used for loud speaker 11SW1A and the 11SW2A of listener 4A and loud speaker 11SW1B and the 11SW2B that is used for listener 4B.
One steel plate (not shown) is to embed the back of the sofa 87 shown in Figure 28 A with the identical mode shown in Figure 26 A.Magnet unit 86 (seeing Figure 27) with bolt to speaker retainer 85.Speaker retainer 85 is fixed in sofa 87 with magnet unit 86 by the mode that magnetic force is adsorbed in the steel plate at the back that embeds sofa 87 thus.
The position relation of the position of loud speaker 11SW1A and 11SW2A and listener 4A relation and loud speaker 11SW1B and 11SW2B and listener 4B concerns with above-mentioned position and remains unchanged.Shown in Figure 28 B, loud speaker 11SW2A and loud speaker 11SW2B face loud speaker 11SW1A and 11SW1B respectively, and sound from listener 4A and listener 4B rear.Loud speaker 11SW2A and loud speaker 11SW2B sound from its vibrating diaphragm on the vertical direction of the direction of sounding from its vibrating diaphragm with loud speaker 11SW1A and 11SW1B.
From among loud speaker 11SW1A and the 11SW2A each vibrating diaphragm sound with the direction vertical from each the direction of sound transmission of vibrating diaphragm among loud speaker 11SW1B and the 11SW2B on propagate.
If extend at dotted line center from each vibrating diaphragm of loud speaker 11SW2A and 11SW2B on perpendicular to the direction of vibrating diaphragm, then this dotted line is with the ear of distance dsw through each listener.
When listener 4A and 4B shown in Figure 28 A were sitting on the sofa 87, loud speaker 11SW1A and 11SW2A provided the sound of its reproduction and loud speaker 11SW1B and 11SW2B provide the sound of its reproduction to listener 4B to listener 4A.
Shown in Figure 28 B, provide audio signal so that loud speaker 11SW1A and 11SW2A send the sound wave of homophase to the ears of listener 4A from its vibrating diaphragm (front of loudspeaker unit) to loud speaker 11SW1A and 11SW2A.Similarly, provide audio signal so that loud speaker 11SW1B and 11SW2B send the sound wave of homophase to the ears of listener 4B from its vibrating diaphragm (front of loudspeaker unit) to loud speaker 11SW1B and 11SW2B.In Figure 28 B and 28C, the phase place of symbol "+" and "-" expression sound wave, and the phase place of "+" and "-" is opposite.
Shown in Figure 28 B, two loud speakers of listener 4A and two loud speakers of listener 4B provide the sound wave of homophase.If listener 4A and listener 4B relatively are spaced from each other, two loud speakers that then are used for listener 4A provide anti-phase sound wave with two loud speakers that are used for listener 4B shown in Figure 28 C.
As shown in figure 29, be used for the loud speaker 11SW1A of listener 4A and 11SW2A by so that its vibrating diaphragm mutually in the face of and the mode of head between loud speaker 11SW1A and 11SW2A of listener 4A is provided with.Similarly, be used for the loud speaker 11SW1B of listener 4B and 11SW2B by so that its vibrating diaphragm mutually in the face of and the mode of head between loud speaker 11SW1B and 11SW2B of listener 4B is provided with.
Being provided with in the example of Figure 29, the loud speaker 11SW2A and the loud speaker 11SW2B that are used for listener 4A preferably are arranged to make the sound wave that sends from the back side of its vibrating diaphragm to cancel out each other.To these loud speakers audio signal is provided so that from the loud speaker 11SW1A that is used for listener 4A and sound wave that 11SW2A sends with opposite from the sound wave phase place of loud speaker 11SW1B that is used for listener 4B and 11SW2B.
Figure 28 A to 28C and shown in Figure 29 provide the audio reproducing system of music to adopt magnet unit that speaker retainer is fixed in sofa to a plurality of listeners.Also have various other mechanisms to use, comprise the suspension gear shown in Figure 22, Figure 23 and 24 stand-alone loudspeaker fixture and the mechanism of speaker retainer being fixed in wall from the roof.
Referring to Figure 20 to 29, the loud speaker that install is a subwoofer.Each speaker retainer can support back loud speaker etc. on demand.
The modification of other embodiment
Because be arranged near listener 4 the ears loud speaker 11SW1 and 11SW2 ears according to the foregoing description, so low-frequency sound arrives listener 4 expeditiously in the face of listener 4.The position that is provided with of loud speaker is not limited to this position.For example, as shown in figure 30, loud speaker is provided with any point in the sphere that the position can be the center at the center with listener 4 head (distance of radius with head of dsw+ listener 4).Yet loud speaker preferably is placed in the space behind listener 4 the facial plane.As shown in figure 30, it is unfavorable loud speaker being placed in the space before listener 4 the facial plane.
In the above-described embodiments, near loud speaker 11SW1 and the 11SW2 that is arranged at listener 4 the ears is subwoofer always.But loud speaker 11SW1 and 11SW2 be subwoofer not necessarily, and subwoofer can be divided and is arranged.
The loudspeaker unit that loud speaker 11SW1 and 11SW2 are installed is to allow being not limited to the aforementioned tube mounting structure in the mode of sound addition from the mechanism that the front and back of each vibrating diaphragm is sounded.For example, the loudspeaker unit that is used for low-frequency sound can be fixed on the plate that wherein has a plurality of large-sized holes, and can be added together from the sound that the front and back of each vibrating diaphragm sends by all holes.
Audio reproducing system reproduces 5.1 channel audio signal.The present invention can be applicable to not only reproduce the audio reproducing system that 5.1 channel audio signal are also reproduced a plurality of other channel audio signal.
One skilled in the art will understand that according to design needs and other factors various modifications, combination, sub-portfolio and change to occur, but they are still in the scope of claims or its equivalence techniques scheme.

Claims (18)

1. audio reproducing system comprises:
A pair of loudspeaker unit;
Erecting device is used for so that the mixed mode of sending from the front and back of the vibrating diaphragm of each loudspeaker unit of sound will not be installed on the described a pair of loudspeaker unit of sound panel is installed near listener's the ears; And
Audio signal output device, comprise 5.1 channel decoding devices, the relevant rear transfer function memory of virtual sound source process device and head and/or the relevant the place ahead of head transfer function memory, wherein, described virtual sound source process device will be from the audio signal of 5.1 channel decoding devices the head related transfer function of relevant rear transfer function memory with described head and/or the relevant the place ahead of described head transfer function memory stores carry out convolution can to feel to resemble described sound be to come virtual acoustic imaging input audio signal and export the signal of institute's virtual acoustic imaging to described a pair of loudspeaker unit from the mode that other speaker unit sends so that the listener listens to the sound that is reproduced by described a pair of loudspeaker unit.
2. audio reproducing system as claimed in claim 1 is characterized in that, described input audio signal comprises the back channel audio signal of multitrack surround sound, and
Can to feel to resemble described sound be to come virtual acoustic imaging described back channel audio signal and export the signal of institute's virtual acoustic imaging to described a pair of loudspeaker unit from the mode that the speaker unit that is arranged at described listener rear sends to described audio signal output device so that the listener listens to the sound that is reproduced by described a pair of loudspeaker unit.
3. audio reproducing system as claimed in claim 2 is characterized in that, provides the low-frequency audio signal of described multitrack surround sound to described loudspeaker unit.
4. audio reproducing system as claimed in claim 1 is characterized in that, described input audio signal comprises the preceding channel audio signal of multitrack surround sound, and
Can to feel to resemble described sound be channel audio signal and export the signal of institute's virtual acoustic imaging to described a pair of loudspeaker unit before coming the virtual acoustic imaging described from the mode that the speaker unit that is arranged at described listener the place ahead sends to described audio signal output device so that the listener listens to the sound that is reproduced by described a pair of loudspeaker unit.
5. audio reproducing system as claimed in claim 4 is characterized in that, provides the low-frequency audio signal of described multitrack surround sound to described loudspeaker unit.
6. audio reproducing system as claimed in claim 1 is characterized in that, described input audio signal comprises the preceding channel audio signal and the back channel audio signal of multitrack surround sound, and
Can to feel to resemble described sound be to come the described front channel audio signal of virtual acoustic imaging and export the signal of institute's virtual acoustic imaging to described a pair of loudspeaker unit from the mode that the speaker unit that is arranged at described listener the place ahead sends to described audio signal output device so that the listener listens to the sound that is reproduced by described a pair of loudspeaker unit, and can to feel to resemble described sound be to come the described rear channel audio signal of virtual acoustic imaging and export the signal of institute's virtual acoustic imaging to described a pair of loudspeaker unit from the mode that the speaker unit that is arranged at described listener rear sends so that described listener listens to the sound that is reproduced by described a pair of loudspeaker unit.
7. audio reproducing system as claimed in claim 6 is characterized in that, provides the low-frequency audio signal of described multitrack surround sound to described loudspeaker unit.
8. audio reproducing system as claimed in claim 1 is characterized in that, described erecting device is installed to the listener with described loudspeaker unit and can be sitting on the top chair.
9. audio reproducing system as claimed in claim 1 is characterized in that, described a pair of loudspeaker unit is installed towards listener's auris dextra and left ear respectively.
10. audio reproducing system as claimed in claim 9 is characterized in that, described erecting device is installed described a pair of loudspeaker unit in the space at listener's facial plane rear.
11. audio reproducing system as claimed in claim 4 is characterized in that, described erecting device is also installed the loud speaker of the back channel audio signal that is used for described multitrack surround sound.
12. a method of reproducing audio sound may further comprise the steps:
So that will being installed on a pair of loudspeaker unit of sound panel, the mixed mode of sending from the front and back of the vibrating diaphragm of each loudspeaker unit of sound is not installed near listener's the ears; And
By the virtual sound source process device will be from the audio signal of 5.1 channel decoding devices the head related transfer function of relevant rear transfer function memory with described head and/or the relevant the place ahead of described head transfer function memory stores carry out convolution can to feel to resemble described sound be to come virtual acoustic imaging input audio signal and export the signal of institute's virtual acoustic imaging to described a pair of loudspeaker unit from the mode that other speaker unit sends so that the listener listens to the sound that is reproduced by described a pair of loudspeaker unit.
13. method as claimed in claim 12 is characterized in that, also comprises:
Can to feel to resemble described sound be to come channel audio signal after the virtual acoustic imaging and export the signal of institute's virtual acoustic imaging to described a pair of loudspeaker unit from the mode that the speaker unit that is arranged at described listener rear sends so that the listener listens to the sound that is reproduced by described a pair of loudspeaker unit, and wherein said input audio signal comprises the back channel audio signal of multitrack surround sound.
14. method as claimed in claim 13 is characterized in that, provides the low-frequency audio signal of described multitrack surround sound to described loudspeaker unit.
15. method as claimed in claim 12, it is characterized in that, comprise that also can to feel to resemble described sound be to come virtual acoustic imaging input audio signal and export the signal of institute's virtual acoustic imaging to described a pair of loudspeaker unit from the mode that the speaker unit that is arranged at described listener the place ahead sends so that the listener listens to the sound that is reproduced by described a pair of loudspeaker unit, wherein said input audio signal comprises the preceding channel audio signal of multitrack surround sound.
16. method as claimed in claim 15 is characterized in that, provides the low-frequency audio signal of described multitrack surround sound to described loudspeaker unit.
17. method as claimed in claim 12 is characterized in that, also comprises:
Can to feel to resemble described sound be to come channel audio signal before the virtual acoustic imaging and export the signal of institute's virtual acoustic imaging to described a pair of loudspeaker unit from the mode that the speaker unit that is arranged at described listener the place ahead sends so that the listener listens to the sound that is reproduced by described a pair of loudspeaker unit; And so that described listener listens to the sound that is reproduced by described a pair of loudspeaker unit can to feel to resemble described sound be to come channel audio signal after the virtual acoustic imaging and export the signal of institute's virtual acoustic imaging to described a pair of loudspeaker unit from the mode that the speaker unit that is arranged at described listener rear sends, wherein said input audio signal comprises front channel audio signal and the rear channel audio signal of multitrack surround sound.
18. method as claimed in claim 17 is characterized in that, provides the low-frequency audio signal of described multitrack surround sound to described loudspeaker unit.
CN2007100063496A 2006-02-01 2007-01-31 Audio reproducing system and method thereof Expired - Fee Related CN101014210B (en)

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ES2323563B1 (en) * 2008-01-17 2010-04-27 Ivan Portas Arrondo SOUND FORMAT CONVERSION PROCEDURE 5.1. TO HYBRID BINAURAL.
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