JP2003061195A - Sound signal reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic reproducing device by which a reproduced sound localized at a prescribed position can be obtained even when a loudspeaker is located anywhere in a room. SOLUTION: The sound signal reproducing device is provided with a couple of loudspeakers 6L, 6R, a virtual sound image localization processing means 21 that applies virtual sound images 6L', 6R' at a prescribed position on the basis of an acoustic transfer function from the positions of the loudspeakers 6L, 6R to a listening point 70, and a control means 3 that selects the acoustic transfer function of the virtual sound image localization processing means 21. The control means 3 switches the acoustic transfer function on the basis of the relation of the positions of the loudspeakers 6L, 6R and the listening point 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal reproducing apparatus suitable for application to a home theater or the like.

[0002]

2. Description of the Related Art Conventionally, at home, for example, a CD (Compact Disc)
c) When listening to the playback sound of the playback device, the playback speaker is generally placed in front of the listener (listening point) in the room and symmetrically, which is also an appropriate position. At this time, the sounds emitted from the respective speakers have the feeling of coming from the front of the listener.

However, in the case where a user enjoys watching and listening to video and audio obtained by reproducing a television (TV) broadcast, a video cassette, a DVD (Digital Versatile Disc), etc., for example, listening in a room. A TV monitor is required in front of the listener, and due to room limitations, there is no space to place speakers on both sides of this TV monitor. It may not be possible to place the speaker in a different position. Also, when using a thin wall-mounted TV monitor or the like, there is a case in which it is not desirable to place a speaker in front of the listener in appearance. In such a case, the listener is unavoidably forced to place speakers at improper positions other than the front of the listener to listen to the sound.

[0004]

However, the sound emitted from each of the speakers arranged in the above-mentioned incorrect positions does not come from the front, and the sound image of the sound from these speakers and the TV The direction of the image on the monitor was wrong. In addition, since a sound image shift (sound image blur) can occur between the position where the sounds emitted from these speakers overlap and the actual listener position (listening point), a discomforting sound and a natural sound field can be heard. Could not be reproduced.

Further, even if the speaker can be arranged at an appropriate position in front of the listener, the distance from the listener to the speaker arranged in front is limited in a general home room, and the front side is limited. In terms of the sense of depth in the direction, the reproduced voice was not always satisfactory.

In view of the above point, the present invention proposes an audio signal reproducing apparatus which can obtain reproduced sound localized in a predetermined direction, particularly in the front, regardless of where the speaker is arranged in the room.

[0007]

An audio signal reproducing apparatus according to the present invention includes a pair of speakers and a virtual sound image localization processing for locating a virtual sound image at a predetermined position based on an acoustic transfer function from the position of the speakers to a listening point. The processing means and the control means for switching the acoustic transfer function of the virtual sound image localization processing means are provided, and the control means switches the acoustic transfer function based on the positional relationship between the position of the speaker and the listening point.

According to the present invention, the sound transfer function of the virtual sound image localization processing means is switched based on the positional relationship between the position of the pair of speakers and the listening point to localize the virtual sound image at a predetermined position. Therefore, the viewer can obtain the reproduced sound in which the sound image is localized at a predetermined position regardless of where the speaker is placed in the room.

Further, the audio signal reproducing apparatus of the present invention includes at least three speakers, and virtual sound image localization processing means for performing localization processing of a virtual sound image at a predetermined position based on the acoustic transfer function from the position of the speaker to the listening point. And a control means for switching the acoustic transfer function of the virtual sound image localization processing means, the control means switching the acoustic transfer function based on the positional relationship between the position of the speaker and the listening point, and the virtual sound image localization processing means. In, the virtual sound image is localized at slightly different positions.

According to the present invention, the acoustic transfer function of the virtual sound image localization processing means is switched based on the positional relationship between the positions of at least three speakers and the listening point, and virtual positions are set to slightly different predetermined positions. Since the sound image is localized, the viewer can obtain a reproduced sound in which the sound image is localized at a predetermined position regardless of where the speaker is placed in the room, and the localization of the sound image to a predetermined position can be enhanced. it can.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an audio signal reproducing apparatus of the present invention will be described below with reference to FIGS. 1, 2 and 3.

In the present invention, the sound image is localized at a predetermined position regardless of the position of the speaker to be arranged. In this example, the localization of the sound image in front of the listener will be described.

In FIG. 1, reference numeral 1 is a CD for obtaining an audio signal.
A virtual sound image localization processing means 21 that is a (Compact Disc) player and performs virtual sound image localization processing described later on the audio signals for the left and right speakers reproduced by the CD player 1.
And multipliers 21L and 21R that adjust the left and right signal levels by multiplying the output signal of the virtual sound image localization processing means 21 by a predetermined multiplier, and the amplifier 21L that amplifies the audio signal.
1, 21R1 and a pair of speakers.

A ROM 4 for pre-storing several kinds of acoustic transfer functions from the position of an arbitrary speaker to a listener, a RAM 5 of a running memory, a speaker arranged in an actual room and a listener. And a control means 3 for reading out an appropriate acoustic transfer function from the ROM 4 based on the information on the three-dimensional positional relationship with the virtual sound image localization processing means 21 according to the acoustic transfer function selected by the virtual sound image localization processing means 21. Is equipped with.

The expression method used to indicate the positional relationship between the position of the speaker and the listener will now be described.

In this example, the speakers 6L and 6R are arranged symmetrically with respect to the front direction of the listener 70. Positional information in the space of the speakers 6L and 6R arbitrarily arranged around the listener 70 is shown as in FIGS. 2A and 2B. As shown in FIG. 2A, the angle of rotation of the speakers 6L and 6R when viewed from directly above the listener 70 is θ from the front direction of the listener 70, and as shown in FIG. Speakers 6L, 6 when viewed horizontally from behind
The upper and lower angles of R with respect to the listener 70 are agreed with δ to represent the position of the speaker.

Then, for example, in a display menu item or a corresponding display section for displaying a menu of an audio signal reproducing device (not shown) provided in the control means 3, the positional information of the speaker actually arranged in the room is inputted. A speaker position setting menu item having a function is provided so that the listener inputs the rotation angle θ and the vertical angle δ representing the position information of the speaker by pressing the setting buttons (not shown) arranged on the control means 3, respectively. . Table 1 shows an example of the horizontal angle θ and the vertical angle δ.

[0018]

[Table 1]

As a method of inputting the speaker position information on the speaker position setting menu, as shown in Table 1, the listener 70 is selected from several horizontal angles θ and vertical angles δ stored in advance in the ROM 4. Is to combine the horizontal angle θ and the vertical angle δ that are closest to the speaker arrangement in the room. For example, for a certain speaker, “(rotation angle θ) = (30 °)” and “(vertical angle δ) = (0 °)” are selected and position information is input. This rotation angle θ
And one combination of the vertical angle δ determines one acoustic transfer function of the virtual sound image localization processing.

The smaller the step width of the rotation angle θ and the vertical angle δ, the better the effect according to the actual speaker arrangement is. However, since one acoustic transfer function is required for each speaker position, the step The smaller the width, the larger the capacity of the ROM 4 for storing data, and the higher the cost. When the cost is limited, for example, as shown in Table 2, the information about the rotation angle θ and the up-down angle δ is expressed using a word that allows the position of the speaker to be easily imaged. For example, if the rotation angle θ is “30 °”, the word expression is “forth-na
Selectable patterns such as "rrow" are provided.

[0021]

[Table 2]

The display of the speaker position setting menu may be provided not only on the control means 3 but in the audio signal reproducing device such as the CD player 1, the so-called AV amplifier, or other devices. It may be provided.

Reference numeral 70 denotes a listener, which indicates the listening position and the orientation of the listener 70 for listening to the sound emitted from the speakers 6L and 6R. In FIG. 1, the listener 70 faces the right side of the drawing, and this direction is the front direction of the listener 70 and the direction in which a TV monitor or the like is installed. Reference numeral 80 denotes a remote control switch used for operating the CD player 1, switching display menu items, etc., which is a so-called remote control.

When the audio signals for the left and right speakers are reproduced by the CD (Compact Disc) player 1 for obtaining the audio signals, the reproduced left and right audio signals are respectively sent to the virtual sound image localization processing means 21 for performing virtual sound image localization processing. Supplied. In the virtual sound image localization processing means 21, the left and right virtual sound image localization processings are performed according to the acoustic transfer function selected based on the position information indicating the positional relationship between the left and right speakers 6L and 6R and the listener 70. Output an audio signal.

The virtual sound image localization processing means 21 will now be described. FIG. 3 is a diagram for explaining the acoustic transfer function necessary for the virtual sound image localization processing for localizing the sound image performed in the virtual sound image localization processing means 21.

In the virtual sound image localization processing means 21, as shown in FIG. 3A, the virtual speaker position 6 in front of the listener 70 on the left front side.
When the sound is emitted from L ′, the acoustic transfer function HLL ′ to the left ear of the listener 70 and the acoustic transfer function HRL ′ to the right ear of the listener 70, and the virtual speaker position on the right front of the listener 70 Listener 70 when sound is emitted from 6R '
The acoustic transfer function HLR 'to the left ear of the listener and the acoustic transfer function HRR' to the right ear of the listener 70 are required.

Further, as will be described later, left and right speakers 6
To compensate for so-called crosstalk when sound is emitted from L and 6R, as shown in FIG. 3B, sound transmission to the left ear of listener 70 when sound is emitted from left speaker 6L. Function HLL and acoustic transfer function HRL to the right ear of the listener 70, and acoustic transfer function HLR to the left ear of the listener 70 and right ear of the listener 70 when sound is emitted from the right speaker 6R. Acoustic transfer function HRR
And are needed.

With respect to these acoustic transfer functions, real speakers are arranged at respective positions of the virtual speaker positions 6L 'and 6R' shown in FIG. 3A, and an impulse sound is emitted from the speakers arranged at these positions to listen. It can be obtained by measuring the impulse responses at the left and right ears of the person 70, respectively.
That is, the impulse response measured at the ear of the listener 70 is
It is the acoustic transfer function from the position of each speaker that emitted the impulse sound to the ear of the listener 70.

Based on the acoustic transfer function thus obtained, virtual sound image localization processing for localizing a sound image forward is performed.

FIG. 3B is a block diagram for explaining the virtual sound image localization processing means 21. As shown in FIG. 3B, the virtual sound image localization processing means 21 includes filters 211, 212, 213 and 214 used for so-called binauralization processing for obtaining natural sound in both ears of the listener 70, and left and right speakers 6L and 6R. Filters 231, 232, 233 used in the crosstalk compensation process for compensating the spatial acoustic crosstalk generated when the reproduced sound from the device is emitted.
234 and adders 221, 222, 241, 242.

As shown in FIG. 3B, the filters 211, 2
12, 213 and 214 are acoustic transfer functions HLL ', HRL', HLR 'and HRR' from the virtual speaker positions 6L 'and 6R' to the listener 70 described with reference to FIG. 3A are used as filter coefficients. Is.

Further, the filters 231, 232, 233,
234, as shown in Table 3, acoustic transfer functions HLL, HRL, HLR, HRR from the left and right speakers 6L, 6R described with reference to FIG. 3A to the left and right ears of the listener 70.
The coefficient for crosstalk compensation processing is calculated based on
The obtained coefficients G1, G2, G3 and G3 are used as filter coefficients.

[0033]

[Table 3]

Then, the audio signal for the left speaker reproduced by the CD player 1 is supplied to the filters 211 and 212 of the virtual sound image localization processing means 21. The audio signal for the right speaker is the filter 21 of the virtual sound image localization processing means 21.
3, 214.

The filters 211 and 212 perform signal processing of the audio signal supplied to the left speaker 6L based on the filter coefficients HLL 'and HRL', and the sound emitted from the left speaker 6L is a virtual image in front of the listener 70. Speaker position 6
There is a sound image at L'or a sound image at the virtual speaker position 6L 'side.

Similarly, the filters 213 and 214 use the right speaker 6 based on the filter coefficients HLR 'and HRR'.
The right speaker 6 performs signal processing of the audio signal supplied to R.
The sound emitted from R has a sound image at the virtual speaker position 6R ′ in front of the listener 70, or the virtual speaker position 6
It should be perceived as if there is a sound image on the R'side.

Then, the audio signal listened to by the left ear of the listener 70 processed by the filters 211 and 214 is supplied to the adder 221. Also filters 212 and 2
The audio signal processed by the right ear of the listener 70 processed in 13 is supplied to the adder 222.

The voice signal added by the adder 221 is
The audio signals supplied to the filters 231 and 232 and added by the adder 222 are supplied to the filters 233 and 234.

Filters 231, 232, 233, 234
At, the filter coefficient G obtained based on the acoustic transfer function from the speakers 6L, 6R to the ears of the listener 70
Processing for canceling crosstalk is performed according to 1, G2, G3, and G4. Then, the filters 231 and 2
The audio signal processed by 34 is supplied to the adder 241, and the audio signal processed by the filters 232, 233 is supplied to the adder 242.

A sound signal supplied from the adder 241 to the left speaker 6L, and when the sound is emitted from the left speaker 6L, the sound is perceived as if there is a sound image at the virtual speaker position 6L 'in front of the listener 70. The signal is output. Further, the audio signal supplied from the adder 242 to the right speaker 6R, and when the sound is emitted from the right speaker 6R, the audio signal is perceived as if there is a sound image at the virtual speaker position 6R 'in front of the listener 70. Is output.

As described above, the virtual sound image localization processing means 21 is calculated from the positional relationship between the pair of speakers and the listener 70.
One acoustic transfer function of the virtual sound image localization processing is determined and stored in the ROM 4. This acoustic transfer function is obtained for each of several speaker positions set on the speaker position setting menu, and is similarly stored in the ROM 4.

Then, the listener 70 arranges the speaker at a desired position in the room, and operates a setting button (not shown) arranged on the control means 3 based on the arrangement positions of the left and right speakers 6L and 6R. The position information of the rotation angle θ and the vertical angle δ of the speaker position setting menu is selected. Then, the control means 3 reads out the acoustic transfer function corresponding to the selected position information from the ROM 4 and RA of the running memory.
The acoustic transfer function for virtual sound image localization processing is changed through M5, and the left and right audio signals from the CD player 1 are obtained as output signals in which virtual sound image localization processing is performed according to the changed acoustic transfer function.

In setting the position information in the speaker position setting menu of the controller 3 described above, the means for selecting the rotation angle θ and the vertical angle δ may be performed by remote operation by the remote controller 80. For example, the main body of the remote controller 80 is provided with a menu display function, and while viewing the display of the speaker position setting menu of the remote controller 80, the setting button provided on the remote controller 80 is operated to select a predetermined device equipped with the menu display function. The position information of the speakers 6L and 6R is set by wireless communication. Then, when the setting of the position information of the speaker by the remote controller 80 is completed, the setting confirmation display may be performed by the menu display of the receiving side device equipped with the menu display function or the remote controller 80.

The left and right audio signals subjected to virtual sound image localization processing by the virtual sound image localization processing means 21 are respectively multiplied by the multiplier 21.
The amplifiers 21L1 and 21R are supplied to the amplifiers 21L1 and 21R, respectively.
It is supplied to R1. The amplifiers 21L1 and 21R1 are amplified to a predetermined level and supplied to the left and right speakers 6L and 6R in front of the listener 70, and the reproduced sound is emitted.

In this way, the virtual sound image localization processing means 2
By the virtual sound image localization processing of No. 1, the listener 70 obtains the reproduced sound in which the sound image is localized at a predetermined position in front of the listener 70 regardless of the positions of the left and right speakers 6L and 6R where the sound is actually emitted.

According to this example, the pair of speakers 6
Based on the positional relationship between the positions of L and 6R and the listener 70,
Since the sound transfer functions of the virtual sound image localization processing means 21 are switched to localize the virtual sound images 6R 'and 6L' in front of the listener 70, the sound images can be viewed regardless of where the speakers 6R and 6L are placed in the room. The virtual speakers 6L ′, 6 can be located in front of the viewer 70 as if they were in front of the viewer 70.
It is possible to obtain an audible feeling as if the reproduced voice is heard from R '.

In the speaker position setting menu, when the remote control 80 is used to input the positional information of the speakers 6L and 6R, the listener 70 keeps the listening position at the speaker 6L, 6R.
Since the 6R position information can be input, the playback sound emitted from the speaker can be confirmed at the same time while the position information of the speaker is being set, and the setting can be performed accurately.
It is possible to eliminate the troublesomeness of the listener 70 approaching the setting button of the control means 3 and directly inputting it.

Further, in the example of FIG. 1, the speakers 6L and 6R are
When the above are arranged symmetrically with respect to the front direction of the listener 70, the virtual sound image localization processing configuration in the virtual sound image localization processing means 21 can be simplified and the used capacity of the ROM 4 can be saved.

Further, since the speaker can be placed in an unobtrusive place in the room or in the recess of the wall because the position of the speaker is not selected, the interior of the room can be improved and the space can be effectively utilized.

Further, since the position of the speaker is not selected, a so-called large-screen home theater can be realized even in a relatively small room by using the audio signal reproducing device of the present invention and a thin liquid crystal monitor together in the AV system. .

In this example, the localization of the sound image toward the front of the listener 70 is described, but when the acoustic transfer function in the virtual sound image localization process is obtained, the virtual speaker positions 6L 'and 6L are used.
By changing the position of R ′, measuring the impulse response, and changing the filter coefficients of the filters 211 to 214 accordingly, the sound images of the reproduced sound output from the left and right speakers 6L and 6R are localized at a desired position. be able to.

Further, the speakers 6L and 6R are arranged symmetrically with respect to the front direction of the listener 70.
If the position information input method on the speaker position setting menu is such that position information can be input for each of the left and right speakers 6L and 6R, the speaker 6L,
The arrangement of 6R may be any speaker arrangement without being symmetrical, and the sound image can be localized at a predetermined position.

Next, another example of the embodiment of the audio signal reproducing apparatus of the present invention will be described with reference to FIG. 4, parts corresponding to those in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted.

Since the head-related transfer function of each viewer is unique to each person, the so-called crosstalk cancellation may not be sufficiently performed depending on the arrangement position of the speaker in the acoustic transfer function measured by the experimental dummy head. It can happen. As a means for avoiding this, it is conceivable to use a plurality of pairs of virtual sound image localization processing means and a plurality of speakers to enhance front localization.

In general, it is known that a person recognizes the arrival direction of a sound by judging the difference in the strength of the sound reaching both ears and the time difference reaching the left and right ears.

In this example, paying attention to this point, virtual sound image localization processing is performed on a plurality of speaker pairs so that the sound images of the reproduced sound emitted from the respective speakers are localized at slightly different positions. The sense of localization of the sound image to a predetermined position is enhanced by intentionally shifting the sound image rather than pinpointing it.

FIG. 4 shows a pair of speakers 6 in the example of FIG.
L1 and 6R1 are additionally provided, and along with this, virtual sound image localization processing means 22 and associated multipliers 22L and 22R and amplifiers 22L1 and 22R1 are additionally provided, and the virtual sound image localization processing means 21 performs virtual sound image localization processing on the sound image 6L. ', 6R'
The sound images 6L1 'and 6R1' are localized at positions slightly different from. Others have the same configuration as the example of FIG.

The left and right audio signals supplied from the CD player 1 for obtaining the audio signal to the virtual sound image localization processing means 21 are branched and supplied to the virtual sound image localization processing means 22.

The acoustic transfer function of the virtual sound image localization processing means 22 is obtained in the same manner as the method of obtaining the acoustic transfer function of the virtual sound image localization processing means 21 of FIG. The acoustic transfer function of the virtual sound image localization processing means 22 has a position 6L1 ', which is slightly different from the positions of the sound images 6L', 6R 'localized by the virtual sound image localization processing means 21,
6R1 'is set so that it is localized.

Also, in the method of setting the position information of the left and right speakers 6L1 and 6R1 in the speaker position setting menu by the control means 3 or the remote controller 80,
It can be performed in the same manner as the example in FIG. Left and right speakers 6L
When the rotation angle θ and the vertical angle δ of the position information where 1 and 6R1 are arranged are selected on the speaker position setting menu, the acoustic transfer function of the virtual sound image localization processing in the virtual sound image localization processing means 22 is set. Speaker 6
The acoustic transfer function of the virtual sound image localization processing in the virtual sound image localization processing means 22 can be set by inputting the position information wherever the arrangement positions of L1 and 6R1 are.

The left and right audio signals subjected to virtual sound image localization processing by the virtual sound image localization processing means 22 are respectively multiplied by the multiplier 22.
L and 22R are supplied to the amplifiers 22L1 and 22R1, after being adjusted to balance the levels of the left and right audio signals by being multiplied by a predetermined multiplier according to the left and right speaker positions. Amplifier 22L1, 22
It is amplified to a predetermined level by R1 and supplied to the additionally installed left and right speakers 6L1 and 6R1.

Then, the left and right speakers 6L1 and 6L
Sound images 6L ′, 6 whose virtual sound image localization process has been performed by the virtual sound image localization processing means 21 in front of the listener 70 from R1.
Sounds localized at positions 6L1 'and 6R1' slightly different from R'are output.

According to this example, two pairs of speakers 6 are provided.
Based on the positional relationship between the positions of L, 6R, 6L1 and 6R1 and the listener 70, the acoustic transfer functions of the virtual sound image localization processing means 21 and 22 are switched to create virtual sound images at slightly different positions in front of the listener 70. 6R ', 6L', 6L
Since the 1'and 6R1 'are localized, the speaker 6
No matter where you place R, 6L, 6L1 and 6R1 in your room,
As if the virtual speaker 6L ', 6 in front of the listener 70
R ', 6L1', 6R1 'can give a sensation as if the reproduced voice were heard, and further, these sound images 6
A slight shift in L ′, 6R ′, 6L1 ′, and 6R1 ′ can enhance the localization of the sound image to the front.

Further, it can be easily understood that this example can obtain the same operational effect as the example of FIG.

In this example, the localization of the sound image toward the front of the listener 70 has been particularly described, but the acoustic transfer function of the virtual sound image localization processing in each of the virtual sound image localization processing means 21 and 22 is described as in the example of FIG. Virtual speaker positions 6L ', 6 when seeking
The impulse response is measured by changing R ′, 6L1 ′, 6R1 ′, and the filter coefficient of the filter is changed according to the impulse response, thereby changing the speaker 6L, 6R, 6L1, 6R.
It is possible to localize the sound image output from No. 1 to a desired position and enhance the localization.

The speaker 6 is used as a plurality of pairs of speakers.
Although four L, 6R, 6L1, and 6R1 are shown, the number of the speakers is not limited to an even number, but may be an odd number as long as a plurality of pairs can be combined. For example, in FIG. 4, the right rear speaker 6R1 of the listener 70 is removed and left front 6
The audio signal reproducing device of the present invention is configured by three speakers of L, front right 6R, and rear left 6L1, and the first virtual sound image localization processing is performed by the front left 6L and the front right 6R, and by the front right 6R and the rear left 6L1. The same effect can be obtained by performing the second virtual sound image localization processing.

Next, another example of the embodiment of the audio signal reproducing apparatus of the present invention will be described with reference to FIG. 5, parts corresponding to those in FIGS. 1 and 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this example, a delay sound reverberation sound addition processing means 23 is additionally provided in the example of FIG. 4, and the sound signals of the delay sound and the reverberation sound output from this delay sound reverberation sound addition processing means 23 are virtual sound localization. By superimposing it on the output signal of the processing means 22, the delayed sound and reverberant sound can be heard from the speakers 6L1 and 6R1. Otherwise, the configuration is the same as in the example of FIG.

The left and right audio signals supplied to the virtual sound image localization processing means 21 and 22 from the CD player 1 for obtaining the audio signal are branched and supplied to the delayed sound reverberation sound addition processing means 23.

The delayed sound reverberant sound adding processing means 23, for example, is a delayed sound such as a reflected sound that arrives behind the wall until the sound emitted from the speaker in the movie theater reaches a predetermined listening point, or the wall. The impulse response at the listening point of reverberant sound or the like reverberating by repeating the reflection is calculated to obtain the acoustic transfer function, and the delayed sound reverberant sound adding processing means is configured.

The left and right audio signals subjected to the delayed sound reverberation processing by the delayed sound reverberation processing means 23 are supplied to the multipliers 23L and 23R, respectively, and are multiplied by a predetermined multiplier according to the position of each speaker. After adjustments are made to balance the levels of the left and right front and rear audio signals, the adder 2
21L, 222R.

In the adders 221L and 222R,
The sound signal in which the direct sound is processed by the virtual sound image localization processing means 22 and the sound signal in which the delayed sound reverberation sound processing is performed by the delayed sound reverberation sound addition processing means 23 are superimposed and supplied to the amplifiers 22L1 and 22R1. To be done. And amplifier 22L
The signals are amplified to a predetermined level by Nos. 1 and 22R1 and supplied to the left and right speakers 6L1 and 6R1 that are additionally installed, respectively.

As described above, the left and right speakers 6L1,
6R1 outputs reproduced sound localized at positions 6L1 ′ and 6R1 ′ slightly different from the sound images 6L ′ and 6R ′ subjected to virtual sound localization to be located in front of the listener 70, and delay sound reverberation sound processing. The reproduced sound that has been reproduced is output.

According to this example, since the audio signal subjected to the delayed sound reverberation processing is superposed on the audio signal subjected to the virtual sound localization processing and output, the listener 70 has a realistic sensation of being engulfed. You can get a surround sound with a certain amount.

Further, it can be easily understood that this example can obtain the same effects as those of the example shown in FIG.

The examples of any of the embodiments described above are
The listener 70 inputs the position information of the speakers arranged in the speaker position setting menu and reads the acoustic transfer function in the virtual sound image localization processing corresponding thereto from the ROM 4, but inputs the position information of the speaker. After that, some virtual sound image localization processing settings different from the actual speaker arrangement may be selected, including the default virtual sound image localization processing setting corresponding to the input position information. Since individual conditions such as the head-related transfer function of the listener and the floor plan of the room are different, it may be possible to select a setting in which the listener is most likely to perceive the effect or is more comfortable for the listener.

Further, the present invention is not limited to the above-described examples of the embodiment, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0078]

According to the present invention, the acoustic transfer function of the virtual sound image localization processing means is switched based on the positional relationship between the position of the speaker and the listening point to localize the virtual sound image at a predetermined position. Therefore, no matter where the speaker is arranged in the room, the viewer can obtain the reproduced sound in which the sound image is localized at a predetermined position.

Further, in the present invention, more accurate virtual sound image localization processing can be performed when the listener can be operated by remote control for menu display and selection in the speaker position setting menu while the listener is in the listening position. At the same time, there is an advantage that the troublesomeness of moving for setting can be eliminated.

In the present invention, when the speakers are arranged symmetrically with respect to the front direction of the listener,
There is an advantage that the virtual sound image localization processing configuration becomes simple and the memory capacity can be saved.

Further, according to the present invention, the acoustic transfer function of the virtual sound image localization processing means is switched based on the positional relationship between the positions of at least three speakers and the listening point, and the virtual sound images are set at slightly different predetermined positions. Since the sound source is localized, the viewer can obtain reproduced sound in which the sound image is localized at a predetermined position, and can further enhance the localization of the sound image at a predetermined position.

Further, in the present invention, when the delay sound reverberation sound adding processing means is provided to add the delay sound and the reverberation sound, it is possible for the listener to obtain a surround sound with a realistic sensation. is there.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of an embodiment of an audio signal reproducing device of the present invention.

FIG. 2 is a diagram used to explain the expression of speaker position information.

FIG. 3 is a diagram for explaining a virtual sound image localization processing means.

FIG. 4 is a configuration diagram showing another example of the embodiment of the audio signal reproducing device of the present invention.

FIG. 5 is a configuration diagram showing another example of the embodiment of the audio signal reproducing device of the present invention.

[Explanation of symbols]

1 ... CD player, 3 ... control means, 6L, 6R ...
Speaker, 6L ', 6R' ... Sound image, 21 ... Virtual sound image localization processing means, 70 ... Listening point

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuhiro Kishi             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F-term (reference) 5D062 AA65

Claims (5)

[Claims] 1. A pair of speakers, a virtual sound image localization processing unit that localizes a virtual sound image at a predetermined position based on an acoustic transfer function from the position of the speaker to the listening point, and the virtual sound image localization processing unit. An audio signal reproducing device, comprising: a control unit that switches an acoustic transfer function, wherein the control unit switches the acoustic transfer function based on a positional relationship between a position of the speaker and a listening point. 2. The audio signal reproducing apparatus according to claim 1, wherein the switching of the acoustic transfer function of the virtual sound image localization processing means can be performed by remote control. 3. The audio signal reproducing device according to claim 1, wherein the speakers are arranged symmetrically with respect to the front direction of the listening point. 4. At least three speakers, a virtual sound image localization processing unit that localizes a virtual sound image at a predetermined position based on the acoustic transfer function from the position of the speaker to the listening point, and the virtual sound image localization processing unit. And a control unit that switches the acoustic transfer function, the control unit switching the acoustic transfer function based on the positional relationship between the position of the speaker and the listening point, and at the same time virtual position to a slightly different position in the virtual sound image localization processing unit. A sound signal reproducing device characterized in that the sound image of the sound source is localized. 5. The audio signal reproducing apparatus according to claim 4, further comprising a delay sound reverberation sound adding processing unit that adds a delay sound and a reverberation sound based on an acoustic transfer function from the position of the speaker to the listening point, An audio signal reproducing apparatus, wherein an output signal from the delayed sound reverberation sound adding processing means is superimposed on an output signal from the virtual sound image localization processing means.