JP2008092534A - Audio reproducing apparatus, video audio reproducing apparatus, and crosstalk cancellation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem in a conventional virtual surround technique, wherein due to crosstalk cancellation being performed utilizing the right and the left front speakers, frequency region that has surround effect will be limited, sweet spots will be to narrow ranges, and sound image localization position will be shifted to an unnatural location, when listener is located outside the sweet spots. <P>SOLUTION: An audio reproducing apparatus provided with at least a left-front speaker L, a right-front speaker R and a center speaker C, includes a first crosstalk cancellation means for outputting, from the center speaker C, a cancellation signal in which the output signal from the left-front speaker L for listening through a left ear cancels the signal, reaching the right ear, and a second crosstalk cancellation means for outputting from the center speaker C, a cancellation signal in which the output signal from the right-front speaker R for listening through the right ear, cancels a signal reaching the left ear. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an audio reproducing apparatus capable of reproducing at least audio, such as a stereo apparatus, or a video / audio reproducing apparatus such as a television receiver, and a crosstalk canceling method, and particularly includes at least left and right front speakers and a center speaker. Sound reproduction that can expand the frequency band with surround effect and the sweet spot (area with surround effect), and reduce the unnatural sound localization even when the audio listening position is out of the sweet spot The present invention relates to a device, a video / audio reproduction device, and a crosstalk cancellation method.

  Various audio surround technologies have been proposed in which a three-dimensional sound is reproduced by generating a virtual sound source laterally or rearward with only a speaker installed in front in an audio reproducing apparatus. As conventional techniques relating to these, for example, JP-A-6-189399 (Patent Document 1), JP-A-9-322300 (Patent Document 2), JP-A-10-66198 (Patent Document 3), JP-A-11- No. 252698 (Patent Document 4).

In these prior arts, a method of mixing sounds with opposite phases to a two-channel speaker installed in front, a sound image localization method using a Schrader method (see Patent Document 3), and an arbitrary position using a head-related transfer function The method of localizing the sound image is taken. With these virtual surround technologies, you can cancel the crosstalk (the sound that reaches the ear on the opposite side of the listener from the left speaker or right speaker) and localize the sound image outside the speaker, or enlarge the sound image, This realizes a three-dimensional acoustic space. In the method of localizing a sound image at an arbitrary position using the head-related transfer function, the volume of the sound of the two-channel speaker installed in the front so that the sound is output from the virtual speaker installed at the arbitrary position. The phase is controlled, and at this time, sound synthesis and crosstalk cancellation are performed simultaneously.
Japanese Patent Laid-Open No. 6-189399 JP-A-9-322300 JP-A-10-66198 Japanese Patent Laid-Open No. 11-252698

  However, with the conventional virtual surround technology, the frequency region with the surround effect is limited, the sweet spot is limited to a narrow range, and the sound image localization position is unnatural when the listener leaves the sweet spot. There was a problem of shifting.

  This is because it is difficult to cancel the crosstalk in the high frequency region, and the listener's position is likely to deviate from the sweet spot in the high frequency region. Also, when the listener leaves the sweet spot, the sound image localization position shifts to an unnatural position because the two-channel speakers are arranged so as to straddle both sides of the sweet spot. This is because the sound image moves closer to the listener than the center when it is off.

  FIG. 6 shows an example of the configuration of the conventional virtual surround technology.

In FIG. 6, 1 is a left channel L signal source, 2 is a right channel R signal source, and 3 is a center channel C signal source. 4 is a left front speaker, 5 is a right front speaker, and 6 is a center speaker. 7 is a listener. Reference numerals 8 to 11 denote crosstalk canceling filters, h ₅ between the signal source 1 of the left channel L and the left front speaker 4, h ₅ between the signal source 2 of the right channel R and the right front speaker ₅ , and the left channel. h ₆ between the right front speaker 5 from the signal source 1 _L, is set as h ₆ between the signal source 2 of the right channel R of the left front speaker 4. Reference numerals 12 and 13 denote signal adders.

The transfer functions from each speaker to the ear of the listener 7 are as shown in the figure. That is, the transfer function from the left front speaker 4 to the left ear of the listener 7 is h _LL , the transfer function from the left front speaker 4 to the right ear of the listener 7 is h _LR , and the left ear of the listener 7 from the right front speaker 5. H _RL , the transfer function from the right front speaker 5 to the right ear of the listener 7 is h _RR , the transfer function from the center speaker 6 to the left ear of the listener 7 is h _CL , and is received from the center speaker 6. transfer function to the right ear of the listener. 7 is a h _CR. The transfer function from the left virtual front speaker 14 to the left ear of the listener 7 is h _LvL , the transfer function from the left virtual front speaker 14 to the right ear of the listener 7 is h _{LvR, and the} right virtual front speaker 15 to the listener 7 The transfer function to the left ear is h _RvL , and the transfer function from the left virtual front speaker 15 to the right ear of the listener 7 is h _RvR .

As described above, the sound from the left and right front speakers 4 and 5 crosses the ears on the opposite side with the transfer functions h _LR and h _RL in addition to those reaching the respective ears on the speaker side with the transfer functions h _LL and h _RR. There is something to reach to. In the crosstalk cancellation control, the sound reaching the both ears of the listener 7 from the left and right front speakers 4 and 5 has a transfer function h _LvL from the left virtual front speaker 14 to the left ear of the listener 7, and the left virtual front speaker 14. To the right ear of the listener 7 is h _LvR, the transfer function from the right virtual front speaker 15 to the left ear of the listener 7 is h _RvL , and the transfer function from the left virtual front speaker 15 to the right ear of the listener 7 is The function is h _RvR, which is synthesized so as to be the same voice as that reached from the left and right virtual speakers 14, 15.

Due to the crosstalk cancellation control, the sound reaching the both ears of the listener 7 from the left and right front speakers 4, 5 has a transfer function h _LvL from the left virtual front speaker 14 to the left ear of the listener 7, and the left virtual front speaker 14. To the right ear of the listener 7 is h _LvR, the transfer function from the right virtual front speaker 15 to the left ear of the listener 7 is h _RvL , and the transfer function from the left virtual front speaker 15 to the right ear of the listener 7 is Since the function is h _{RvR and} is synthesized as the same sound as the sound arrived from the left and right virtual speakers 14 and 15, the sound images of the left virtual front speaker 14 and the right virtual front speaker 15 are displayed outside the actual front speakers 4 and 5. Can be localized.

  FIG. 7 is a diagram for explaining an interference phenomenon caused by the left and right front speakers 4 and 5 when the listener 7 receives the sound of the television receiver having the crosstalk cancellation control function. The dimensions in the figure (interval between left and right front speakers 4, 5 = 70 [cm] +70 [cm], distance from left and right front speakers 4, 5 to listener 7 = 200 [cm]) are representative examples. It is a thing.

  Under such dimensional conditions, a normal phase sine wave 2 kHz is output from the left front speaker 4, and a reverse phase sine wave 2 kHz is output from the right front speaker 5, and the sound pressure characteristics when the listener 7 moves the sound reception position along the dotted line 20 are shown. Measured and shown in FIG. The sound receiving position 0 [cm] is on the dotted line 20 and on the middle position between the left and right front speakers (center position). The measurement point is a point corresponding to the position of the left ear or the right ear. This characteristic is a comb-shaped characteristic, and the period of the comb-shaped characteristic is slightly different between the vicinity of the center position and the position away from the center position. However, the characteristic period is about 26 [cm] when the sound receiving position is near the center position. It can be seen that the range that can be canceled is limited to a narrow range. FIG. 8 shows the characteristics for 2 kHz. However, considering the higher frequency in the audible frequency band, the period of the comb-shaped characteristics is further shortened, and it becomes difficult to cancel the crosstalk when the frequency reaches a certain level.

  FIG. 9 shows the crosstalk cancellation control portion for the left front speaker 4 extracted from FIG. Reference numeral 21 denotes an area called a sweet spot, which indicates an area where the three-dimensional sound can be reproduced. At this time, the sound image of the left virtual front speaker 14 is localized further to the left of the left front speaker 4.

  FIG. 10 shows a case where the listener 7 is displaced from the position of FIG. 9 in the right direction and deviates from the sweet spot 21 region. In this case, the crosstalk is not canceled and the three-dimensional sound is not reproduced. Due to the voice synthesis of the left and right front speakers 4 and 5, the left virtual front speaker 14 'is localized at a substantially middle position between the left and right front speakers (closer to the speaker side closer to the listener 7 than the middle position), and the sound image localization position is unnatural. become.

  As described above, in the conventional virtual surround technology, the frequency region having the surround effect is limited, the sweet spot 21 is limited to a narrow range, and the sound image localization position is set when the listener 7 leaves the sweet spot 21. There was a problem of shifting to an unnatural position.

  In view of the above problems, the object of the present invention is to expand the frequency region having the surround effect, expand the sweet spot range, and unnatural sound image localization position when the listener leaves the sweet spot. It is to prevent the position.

The sound reproducing device according to the present invention includes at least a left front speaker, a right front speaker, and a center speaker disposed at a substantially middle position between the left front speaker and the right front speaker. First crosstalk cancellation means for outputting from the center speaker a signal for synthesizing the same signal as the output signal from the virtual speaker, and the output signal from the right front speaker to both ears. And second crosstalk canceling means for outputting from the center speaker a signal for synthesizing the received signal in the same way as the output signal from the virtual speaker.
In the audio reproducing device of the present invention, the first crosstalk canceling unit includes a first crosstalk cancellation filter, a first signal source, and a center provided between the first signal source and the left front speaker. A second crosstalk cancellation filter provided between the speakers, and the second crosstalk cancellation means includes a third crosstalk cancellation filter provided between the second signal source and the left front speaker. A fourth crosstalk cancellation filter provided between the second signal source and the center speaker is provided.
In the audio reproducing apparatus of the present invention, the first and third crosstalk canceling filters are crosstalk canceling filters having the same configuration, and the second and fourth crosstalk canceling filters have the same configuration. It is a crosstalk cancellation filter.
In the audio reproducing apparatus of the present invention, the first signal source is a left channel signal source, and the second signal source is a right channel signal source.
In the audio reproducing device of the present invention, the first crosstalk canceling unit includes a fifth crosstalk canceling filter, a third signal source, and the center provided between the third signal source and the left front speaker. A sixth crosstalk cancellation filter provided between the speakers, and the second crosstalk cancellation means includes a seventh crosstalk cancellation filter provided between the fourth signal source and the left front speaker. An eighth crosstalk cancellation filter provided between the fourth signal source and the center speaker is provided.
In the audio reproduction device of the present invention, the fifth and seventh crosstalk canceling filters are crosstalk canceling filters having the same configuration, and the sixth and eighth crosstalk canceling filters have the same configuration. It is a crosstalk cancellation filter.
In the audio reproducing apparatus of the present invention, the third signal source is a left surround channel signal source, and the fourth signal source is a right surround channel signal source.
The video / audio reproduction device of the present invention includes video display means and the audio reproduction device.
In addition, the crosstalk canceling method of the present invention provides at least a left front speaker, a right front speaker, and a crosstalk of a sound reproducing device including a center speaker disposed at a substantially middle position between the left front speaker and the right front speaker. In the canceling method, the signal reaching the both ears from the left front speaker is synthesized with the output signal from the center speaker in the same manner as the output signal from the virtual speaker, and the signal reaching the both ears from the right front speaker is output from the center speaker. The output signal is synthesized in the same manner as the output signal from the virtual speaker.

  According to the present invention, the frequency region having the surround effect is expanded, the range of the sweet spot is expanded, and the sound image localization position can be prevented from being an unnatural position when the listener leaves the sweet spot. .

  Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.

(First embodiment)
FIG. 1 shows a first embodiment of an audio reproducing apparatus according to the present invention.
In FIG. 1, 1 is a signal source for the left channel L, 2 is a signal source for the right channel R, and 3 is a signal source for the center channel C. 4 is a left front speaker, 5 is a right front speaker, and 6 is a center speaker. The center speaker 6 is disposed at a substantially intermediate position between the left front speaker 4 and the right front speaker 5. A device with a display device such as a television receiver is provided at a substantially middle position between the left front speaker 4 and the right front speaker 5 and is provided above or below the display device. 7 is a listener. Reference numeral 22 denotes a signal source for the left surround channel Ls, and reference numeral 23 denotes a signal source for the right surround channel Rs. 24-27 is a filter for crosstalk cancellation, _{h 1} between the left front speaker 4 from a signal source 22 of the left surround channel Ls, _h 1 from the right surround channel Rs of the signal source 23 between the right front speaker 5, h ₂ from the signal source 22 of the left surround channel Ls between the center speaker _6, is set as h ₂ between the right surround channel Rs of the signal source 23 of the center speaker 6. 28, 29 and 30 are signal adders.

The transfer functions from each speaker to the ear of the listener 7 are as shown in the figure. That is, the transfer function from the left front speaker 4 to the left ear of the listener 7 is h _LL , the transfer function from the left front speaker 4 to the right ear of the listener 7 is h _LR , and the left ear of the listener 7 from the right front speaker 5. H _RL , the transfer function from the right front speaker 5 to the right ear of the listener 7 is h _RR , the transfer function from the center speaker 6 to the left ear of the listener 7 is h _CL , and is received from the center speaker 6. transfer function to the right ear of the listener. 7 is a h _CR.

31 and 32 are virtual surround speakers realized by outputting the signals of the left and right surround channels L _s and R _{s from} the left and right front speakers 4 and 5 and the center speaker 6 through the crosstalk cancellation filters 24 to 27, A virtual surround speaker 31 and a right virtual surround speaker 32 are shown. The transfer function from each virtual surround speaker 31, 32 to the ear of the listener 7 is h _{LsL from} the left virtual surround speaker 31 to the left ear of the listener 7, and from the left virtual surround speaker 31 to the right ear of the listener 7. h _LsR, right-virtual surround speaker 32 to the left ear of the listener 7 _{h RsL,} from the right virtual surround speaker 32 to the right ear of the listener. 7 is a _{h RsR.}

For example, in order to localize the left virtual surround speaker 31 at the position shown in FIG. 1, the transfer functions h ₁ and h ₂ of the crosstalk cancellation filters 24 and 26 are set so as to satisfy the following relationship.

h _LsL * L _s = (h ₁ * h _LL + h ₂ * h _CL ) * L _s
h _LsR * L _s = (h ₁ * h _LR + h ₂ * h _CR ) * L _s

At this time, the transfer functions h ₁ and h _{2 of the} crosstalk cancellation filters 25 and 27 related to the right virtual surround speaker 32 can be similarly set using symmetry, and are localized at positions symmetrical to the left virtual surround speaker 31. The transfer functions h _LL , h _LR , h _RL , h _RR , h _CL , h _CR , h _LsL , h _LsR , h _RsL , h _RsR can be obtained by actual measurement.

  In the present embodiment, the crosstalk cancellation is performed by the left front speaker 4 and the center speaker 6 and the right front speaker 5 and the center speaker 6 in the present embodiment, whereas the conventional technique performs the crosstalk cancellation by the left and right front speakers 4 and 5. The point to do is different. For this reason, in the prior art, a signal for synthesizing the signal of the left surround channel Ls from the signal source 22 through the crosstalk cancellation filter 26 from the signal adder 29 to the right front speaker 5 is output to both ears of the listener 7. In the present embodiment, the signal of the left surround channel Ls from the signal source 22 is output from the signal adder 30 to the center speaker 6 through the crosstalk cancellation filter 26 to the center speaker 6 for both ears of the listener 7. Similarly, for the signal source 23 of the right surround channel, a signal to be synthesized from the center speaker 6 to both ears of the listener 7 is output.

  The sound pressure characteristics when the crosstalk cancellation is performed in this way are shown in FIG. 2 in comparison with the conventional sound pressure characteristics. In FIG. 2, the dotted line indicates the sound pressure characteristic (conventional technology) when the crosstalk is canceled by the left front speaker 4 and the right front speaker 5, and the solid line indicates the left front speaker 4 according to the present embodiment. And the sound pressure characteristics when the crosstalk is canceled by the center speaker 6. This sound pressure characteristic shows a comb-like characteristic.

  As can be seen from FIG. 2, when crosstalk cancellation is performed, the output of the reverse phase signal from the center speaker 6 has a period of fluctuation as large as about twice when the sound receiving position is shifted. This means that even if the sound receiving position is shifted to the left or right, the variation in sound pressure felt by the listener 7 is small, resulting in a wide sweet spot area.

  Conversely, the frequency at which the period of the comb-shaped characteristic of the sound pressure is the same as when a reverse phase signal is output from the right front speaker 5 (conventional technology) is approximately twice due to the relative relationship between the speaker interval and the signal wavelength. It turns out that it becomes the frequency of. That is, if the sweet spot is the same, the center speaker 6 performs crosstalk cancellation, so that control is performed in the present embodiment as compared with the conventional technique in which crosstalk cancellation is performed by the left front speaker 4 and the right front speaker 5. It can be seen that the possible frequency band is expanded about twice.

(Second Embodiment)
FIG. 3 shows a second embodiment of the sound reproducing apparatus according to the present invention.

  In this embodiment, in addition to generating the left and right virtual surround speakers 31 and 32, the left and right virtual front speakers 33 and 34 are generated outside the actual positions of the left and right front speakers 4 and 5.

In FIG. 3, 1 is a signal source for the left channel L, 2 is a signal source for the right channel R, and 3 is a signal source for the center channel C. 4 is a left front speaker, 5 is a right front speaker, and 6 is a center speaker. The center speaker 6 is disposed at a substantially intermediate position between the left front speaker 4 and the right front speaker 5. A device with a display device such as a television receiver is provided at a substantially middle position between the left front speaker 4 and the right front speaker 5 and is provided above or below the display device. 7 is a listener. Reference numeral 22 denotes a signal source for the left surround channel Ls, and reference numeral 23 denotes a signal source for the right surround channel Rs. Reference numerals 24 to 27 and 38 to 41 denote crosstalk cancellation filters, h ₁ between the signal source 22 of the left surround channel Ls and the left front speaker 4, and between the signal source 23 of the right surround channel Rs and the right front speaker 5. h _1, h ₂ from the signal source 22 of the left surround channel Ls between the center speaker _6, is set as h ₂ between the right surround channel Rs of the signal source 23 of the center speaker 6.

Also, from the signal source 1 of the left channel L h ₃ between the left front speaker _4, from the signal source 2 of the right channel R h ₃ between the right front speaker _5, from the signal source 1 of the left channel L of the center speaker 6 h _4, is set as h ₄ between the signal source 2 of the right channel R of the center speaker 6 between. Reference numerals 35, 36 and 37 denote signal adders.

The transfer functions from each speaker to the ear of the listener 7 are as shown in the figure. That is, the transfer function from the left front speaker 4 to the left ear of the listener 7 is h _LL , the transfer function from the left front speaker 4 to the right ear of the listener 7 is h _LR , and the left ear of the listener 7 from the right front speaker 5. H _RL , the transfer function from the right front speaker 5 to the right ear of the listener 7 is h _RR , the transfer function from the center speaker 6 to the left ear of the listener 7 is h _CL , and is received from the center speaker 6. the transfer function to the left ear of the listener. 7 is a h _CR.

  The left virtual surround speaker 31 and the right virtual surround speaker 32 are realized by outputting the signals of the left and right surround channels Ls and Rs from the left and right front speakers 4 and 5 and the center speaker 6 through the crosstalk cancellation filters 24 to 27. It is a speaker.

For example, in order to localize the left virtual surround speaker 31 to the position of FIG. 1, the transfer functions h ₁ and h ₂ of the crosstalk cancellation filters 24 and 26 are set so as to satisfy the following relationship.

h _LsL * L _s = (h ₁ * h _LL + h ₂ * h _CL ) * L _s
h _LsR * L _s = (h ₁ * h _LR + h ₂ * h _CR ) * L _s

At this time, the transfer functions h ₁ and h _{2 of the} crosstalk cancellation filters 25 and 27 related to the right virtual surround speaker 32 can be similarly set using symmetry, and are localized at positions symmetrical to the left virtual surround speaker 31.

The left virtual front speaker 33 and the right virtual front speaker 34 are virtual speakers realized by outputting the left and right channel signals from the left and right front speakers 4 and 5 and the center speaker 6 through the crosstalk cancellation filters 38 to 41. . The transfer function from each virtual front speaker 33, 34 to the ear of the listener 7 is h _{LL ′ from} the left virtual front speaker 33 to the left ear of the listener 7, and from the left virtual front speaker 33 to the right ear of the listener 7. is a _{h LR ', h RL} is to the left ear of the listener 7 from the right virtual front speaker _34', from the right virtual front speaker 34 to the right ear of the listener 7 _{h RR '.}

For example, in order to localize the left virtual front speaker 33 at the position shown in FIG. 3, the transfer functions h ₁ and h ₂ of the crosstalk cancellation filters 38 and 40 are set so as to satisfy the following relationship.

h _LL '* L = (h ₃ * h _LL + h ₄ * h _CL ) * L
h _LR '* L = (h ₃ * h _LR + h ₄ * h _CR ) * L

At this time, the transfer functions h ₁ and h _{2 of the} crosstalk cancellation filters 39 and 41 related to the right virtual front speaker 34 can be similarly set using symmetry, and are localized at positions symmetrical to the left virtual front speaker 33. The transfer functions h _LL , h _LR , h _RL , h _RR , h _CL , h _CR , h _LsL , h _LsR , h _RsL , h _RsR, h _{LL ′} , h _{LR ′} , h _{RL ′} , h _{RR ′} h _{LL '} , H _LR' , h _{RL '} , h _RR' can be obtained by actual measurement.

In the present embodiment, the crosstalk cancellation is performed by the left front speaker 4 and the center speaker 6 and the right front speaker 5 and the center speaker 6 in the present embodiment, whereas the conventional technique performs the crosstalk cancellation by the left and right front speakers 4 and 5. The point is different.
Therefore, conventionally, as shown in FIG. 3, a signal for synthesizing the signal of the left surround channel Ls from the signal source 22 from the signal adder 36 to the right front speaker 5 through the crosstalk cancellation filter 26 to both ears of the listener 7. In this embodiment, a signal for synthesizing the signal of the left surround channel Ls from the signal source 22 through the crosstalk cancellation filter 26 from the signal adder 37 to the center speaker 6 is output to both ears of the listener 7. To do. Similarly, for the signal source 23 of the right surround channel, a signal to be synthesized from the center speaker 6 to both ears of the listener 7 is output.

  Similarly, for the left and right channels 1 and 2, a signal for synthesizing the signal of the left channel L from the signal source 1 from the signal adder 36 to the right front speaker 5 through the crosstalk canceling filter 40 to both ears of the listener 7. In this embodiment, the signal for synthesizing the left channel L signal from the signal source 1 through the crosstalk cancellation filter 40 from the signal adder 37 to the center speaker 6 is output to the center speaker 6. . Similarly, for the signal source 2 of the right channel R, a signal to be synthesized to both ears of the listener 7 is output from the center speaker 6.

  4 and 5 illustrate the sound image localization position of the left virtual front speaker 33 when the listener 7 deviates from the sweet spot 42 region.

  FIG. 4 shows the crosstalk cancellation control portion for the left front speaker 4 extracted from FIG. Reference numeral 42 denotes a sweet spot area, which represents an area where the three-dimensional sound can be reproduced. At this time, the sound image of the left virtual front speaker 33 is localized further to the left of the left front speaker 4.

  FIG. 5 shows a case where the listener 7 is displaced from the position of FIG. 4 in the right direction and deviates from the area of the sweet spot 42. In this case, the crosstalk is not canceled and the three-dimensional sound is not reproduced. In this case, the left virtual front speaker 33 ′ is localized at a substantially intermediate position between the left front speaker 4 and the center speaker 6 by voice synthesis of the left front speaker 4 and the center speaker 6. This localization position is on the left side of the center speaker 6, and is closer to the original localization position of the virtual speaker than the sound image localization position according to the prior art shown in FIG.

  As described above, according to the present embodiment, the frequency region having the surround effect is expanded, the range of the sweet spot 42 is further expanded, and the sound image can be obtained even when the listener 7 leaves the sweet spot 42. It can be localized in a more natural position.

  Although the present invention has been described above with reference to specific embodiments, the present invention is a method of mixing sound synthesized in both ears of each listener into a two-channel speaker installed in the front, and sound image localization using a Schrader method. This method can be applied to a method of localizing a sound image at an arbitrary position using a head-related transfer function, but is not limited thereto, and can be applied to a method using crosstalk cancellation control. Further, although the audio playback device has been described in detail in the above embodiment, the present invention can also be applied to a television receiver including a video display device and an audio playback device. Moreover, it goes without saying that the present invention is not limited to the above-described embodiment, but can be modified and implemented without departing from the gist of the present invention.

  The present invention can be used for a sound reproduction apparatus such as a stereo apparatus or a television receiver that performs crosstalk cancellation control.

It is a block diagram of the audio | voice reproduction apparatus as a 1st Embodiment of this invention, and a figure explaining the positional relationship of a speaker, a listener, and a virtual speaker. It is a figure which shows the sound pressure characteristic when crosstalk cancellation control is performed with the audio | voice reproduction apparatus as the 1st Embodiment of this invention. It is a block diagram of the audio | voice reproduction apparatus as the 2nd Embodiment of this invention, and a figure explaining the positional relationship of a speaker, a listener, and a virtual speaker. It is a figure explaining crosstalk cancellation of the present invention when a listener is in a sweet spot. It is a figure explaining crosstalk cancellation of the present invention when a listener is outside a sweet spot. It is a block diagram of the audio | voice reproduction apparatus by a prior art, and a figure explaining the positional relationship of a speaker, a listener, and a virtual speaker. It is a figure explaining crosstalk cancellation with the audio | voice reproduction apparatus of a prior art. It is a figure which shows the sound pressure characteristic when crosstalk cancellation control is performed with the audio | voice reproduction apparatus of a prior art. It is a figure explaining the crosstalk cancellation of this invention when a listener is in a sweet spot with the audio | voice reproduction apparatus of a prior art. It is a figure explaining the crosstalk cancellation of this invention when a listener is outside a sweet spot with the audio reproduction apparatus of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Left channel L signal source 2 ... Right channel R signal source 3 ... Center channel C signal source 4 ... Left front speaker 5 ... Right front speaker 6 ... Center speaker 7 ... listeners 8-11, 24-27, 38-41 ... crosstalk cancellation filters 12, 13, 28-30, 35-37 ... signal adders 14, 33 ... virtual left Front speaker 15, 34 ... right virtual front speaker 21, 42 ... sweet spot 22 ... signal source 23 of left surround channel Ls ... signal source 31 of right surround channel Rs ... left virtual surround speaker 32 ... Right virtual surround speaker

Claims (9)

In an audio playback device comprising at least a left front speaker, a right front speaker, and a center speaker arranged at a substantially middle position between the left front speaker and the right front speaker,
First crosstalk canceling means for outputting from the center speaker a signal for synthesizing the signal that the output signal from the left front speaker reaches both ears in the same way as the output signal from the virtual speaker;
Second crosstalk canceling means for outputting from the center speaker a signal for synthesizing a signal that an output signal from the right front speaker reaches both ears in the same manner as an output signal from a virtual speaker;
An audio reproducing apparatus comprising: The first crosstalk cancellation means includes a first crosstalk cancellation filter provided between the first signal source and the left front speaker, and a second cross provided between the first signal source and the center speaker. With a filter for talk cancellation,
The second crosstalk cancellation means includes a third crosstalk cancellation filter provided between the second signal source and the left front speaker, and a fourth cross provided between the second signal source and the center speaker. The audio reproducing apparatus according to claim 1, further comprising a talk canceling filter.   The first and third crosstalk cancellation filters are crosstalk cancellation filters having the same configuration, and the second and fourth crosstalk cancellation filters are crosstalk cancellation filters having the same configuration. The sound reproducing device according to claim 2.   4. The audio reproducing apparatus according to claim 2, wherein the first signal source is a left channel signal source, and the second signal source is a right channel signal source. The first crosstalk cancellation means includes a fifth crosstalk cancellation filter provided between the third signal source and the left front speaker, and a sixth cross provided between the third signal source and the center speaker. With a filter for talk cancellation,
The second crosstalk cancellation means includes a seventh crosstalk cancellation filter provided between the fourth signal source and the left front speaker, and an eighth cross provided between the fourth signal source and the center speaker. The audio reproduction device according to any one of claims 1 to 4, further comprising a talk canceling filter.   The fifth and seventh crosstalk cancellation filters are crosstalk cancellation filters having the same configuration, and the sixth and eighth crosstalk cancellation filters are crosstalk cancellation filters having the same configuration. The sound reproducing device according to claim 5.   7. The audio reproducing apparatus according to claim 5, wherein the third signal source is a left surround channel signal source, and the fourth signal source is a right surround channel signal source. .   A video / audio reproduction device comprising: video display means; and the audio reproduction device according to any one of claims 1 to 7. In a crosstalk canceling method of an audio reproducing device including at least a left front speaker, a right front speaker, and a center speaker disposed at a substantially middle position between the left front speaker and the right front speaker,
The signal reaching the both ears from the left front speaker is synthesized with the output signal from the center speaker in the same way as the output signal from the virtual speaker,
A method for canceling crosstalk, characterized in that a signal arriving at both ears from the right front speaker is synthesized with an output signal from the center speaker in the same manner as an output signal from a virtual speaker.

Images