KR20120038891A - Audio system and down mixing method of audio signals using thereof - Google Patents

Abstract

PURPOSE: An audio system and a down mixing method of audio signals using the same are provided to maintain compatibility between multi-channel audio systems having the different number of channels. CONSTITUTION: An audio system includes a horizontal plane speaker set(110) arranged on a horizontal plane and speaker sets(120,130) vertically arranged on a vertical plane. The horizontal plane speaker set includes a center channel speaker arranged around a sweet spot(111), a left channel speaker, a right channel speaker, one or more primary channel speakers(119), and one or more second channel speakers(118). A center vertical channel speaker is located on top parts of sweet spots(121,131) on a horizontal plane. A woofer speaker set(140) includes one or more subwoofer speakers.

Description

Audio system and down mixing method of audio signals using same

The present invention relates to an audio system and a method for downmixing audio signals using the same.

Specifically, the present invention relates to an audio system in which a user can feel an optimal realism and three-dimensional feeling, and a downmixing method of audio signals using the same.

In order to increase the three-dimensional and realism that a user feels when listening to audio, an audio system for reproducing multi-channel audio signals through a plurality of speakers has been developed. An audio system that outputs a multichannel audio signal is called a multichannel audio system. Here, the multi-channel audio signal includes a plurality of audio signals that are separated, and each of the plurality of audio signals may be output through different speakers.

For example, an audio system that outputs 5.1 channels outputs each of six audio signals through six speakers. In detail, the five audio signals L, R, C, SL, and SR are respectively left and right of the front layer, a center of the front layer, and left and right of the rear layer. Left surround and right surround) are output through the five speakers, and the mid and low band audio signals are output through the sub woofer speakers of the low frequency effect.

As the number of channels included in the multi-channel audio signals increases and the number of speakers included in the audio system increases, three-dimensional sound may be realized.

However, the increase in the number of speakers of the audio system has a disadvantage in that the production cost and power consumption of the audio system increases. Accordingly, there is a need to provide an audio system capable of maximizing immersion, realism, and stereoscopic feeling felt by a user using a minimum number of speakers.

In addition, there is a need to provide a downmixing method or apparatus capable of maintaining compatibility between an audio system capable of maximizing the above-mentioned immersion, realism, and stereoscopic effects and an audio system of existing 2.0, 5.1, or 7.1 channels.

An object of the present invention is to provide an audio system capable of maximizing the realism and stereoscopic feeling that a user feels and a method of downmixing audio signals using the same.

It is also an object of the present invention to provide a method for downmixing audio signals that can maintain compatibility between multichannel audio systems having different channel numbers.

According to an embodiment of the present invention, an audio system includes a center channel speaker disposed at a reference point that is 0 degrees forward of a horizontal plane, a left channel speaker and a right channel speaker disposed at left and right 30 degrees from the reference point, and 60 to 150 left and right at the reference point. A set of horizontal plane speakers comprising at least one first channel speaker and at least one second channel speaker disposed between each other, and between 30 and 45 degrees left and right at the reference point and between 30 and 45 degrees in a vertical direction at the reference point And a vertical plane speaker set including a left vertical channel speaker and a right vertical channel speaker respectively disposed at and a center vertical channel speaker disposed between 90 and 150 degrees in a vertical direction from the reference point.

In addition, the at least one first channel speaker may include a left peripheral channel speaker and a left rear channel speaker disposed between 60 to 150 degrees left from the reference point. The at least one second channel speaker may include a right peripheral channel speaker and a right rear channel speaker disposed between right and right 60 to 150 degrees from the reference point.

In addition, the left peripheral channel speaker may be disposed adjacent to the left side 60 degrees from the reference point. The left rear channel speaker may be disposed adjacent to the left 150 degrees from the reference point. The right peripheral channel speaker may be disposed adjacent to the right 60 degrees from the reference point, and the right rear channel speaker may be disposed adjacent to the right 150 degrees from the reference point.

Also, an audio system according to an embodiment of the present invention may further include a woofer speaker set including at least one subwoofer speaker.

In addition, the woofer speaker set may include a left channel woofer speaker and a right channel woofer speaker which are respectively disposed between left and right 30 to 90 degrees from the reference point.

In addition, the woofer speaker set may include any one of a left channel woofer speaker and a right channel woofer speaker which are respectively disposed between left and right 30 to 90 degrees from the reference point. ]

In addition, the first channel speaker and the second channel speaker may include a left peripheral channel speaker and a right peripheral channel speaker disposed between the left and right 100 to 120 degrees from the reference point, respectively.

According to another embodiment of the present invention, an audio system includes a center channel speaker disposed at a reference point that is 0 degrees forward of a horizontal plane, a left channel speaker and a right channel speaker disposed at left and right 30 degrees from the reference point, respectively, and 60 to 150 left and right at the reference point. A set of horizontal plane speakers comprising at least one first channel speaker and at least one second channel speaker disposed between each other, and between 30 and 45 degrees left and right at the reference point and between 30 and 45 degrees in a vertical direction at the reference point A left rear vertical channel speaker and a right rear vertical channel speaker respectively disposed at the left and right rear vertical channel speakers and a right rear vertical channel speaker disposed between 135 to 150 degrees at the reference point and 135 to 150 in the vertical direction at the reference point. It may include a vertical speaker set including.

An audio system according to another embodiment of the present invention is an audio signal generation unit for receiving a predetermined audio signal, downmixing the predetermined audio signal according to the number of speakers included in the speaker unit to generate at least one downmixing signal, And a speaker unit including at least one speaker for respectively outputting the at least one down mixing signal.

The predetermined audio signal may include a center channel audio signal corresponding to a center channel speaker disposed at a reference point that is 0 degrees forward of a horizontal plane, a left channel corresponding to a left channel speaker and a right channel speaker disposed at left and right 30 degrees from the reference point, respectively. An audio signal and a right channel audio signal, at least one first channel audio signal corresponding to at least one first channel speaker and at least one second channel speaker respectively disposed between the left and right 60 to 150 degrees from the reference point, and at least One second channel audio signal, the left vertical channel audio corresponding to the left vertical channel speaker and the right vertical channel speaker respectively disposed between the left and right 30 to 45 degrees from the reference point and between 30 and 45 degrees in the vertical direction from the reference point, respectively. Signal and right vertical channel audio signal, and perpendicular to the reference point With a central vertical channel audio signal corresponding to the vertical center-channel speaker is disposed between 90 to 150 degrees.

The speaker unit may include speakers capable of outputting an audio signal of any one of 7.1, 5.1, and 2.0 channels.

In the downmixing method of an audio signal according to an exemplary embodiment of the present invention, a center channel audio signal corresponding to a center channel speaker disposed at a reference point which is 0 degrees forward of a horizontal plane, a left channel speaker and a right channel disposed at 30 degrees left and right at the reference point, respectively At least one corresponding to a left channel audio signal and a right channel audio signal respectively corresponding to the speaker, at least one first channel speaker and at least one second channel speaker respectively disposed between left and right 60 to 150 degrees from the reference point A first channel audio signal and at least one second channel audio signal, between left and right 30 to 45 degrees at the reference point and between 30 and 45 degrees in the vertical direction at the reference point, respectively. The corresponding left vertical channel audio signal and right vertical channel audio signal, respectively; Receiving input audio signals including a central vertical channel audio signal corresponding to a central vertical channel speaker disposed between 90 and 150 degrees in a vertical direction from a reference point, and receiving the input audio signals into a 7.1, 5.1 or 2.0 channel audio signal Down mixing to generate a down mixing signal.

The generating of the downmixing signal may include generating the downmixing signal corresponding to one channel based on at least one predetermined channel audio signal corresponding to at least one speaker located on the same or adjacent vertical line. Include.

The receiving of the input audio signal may include the center channel audio signal C, the left channel audio signal L, the right channel audio signal R, a left peripheral channel audio signal LS, and a left rear channel audio. The first channel audio signal including the signal LB and the second channel audio signal LH including the right peripheral channel audio signal RS and the right rear channel audio signal RB; The right vertical channel audio signal RH, the center vertical channel audio signal CH, and the left right woofer channel audio signal corresponding to the left channel woofer speaker and the right channel woofer speaker respectively disposed between left and right 30 to 90 degrees from the reference point. And receiving a 10.2 channel audio signal including a LFEL and a woofer channel audio signal LFER.

The receiving of the input audio signal may include the center channel audio signal C, the left channel audio signal L, the right channel audio signal R, and a left peripheral channel audio signal LS. The second channel audio signal including the one channel audio signal and the right peripheral channel audio signal RS, the left vertical channel audio signal LH and the right vertical channel audio signal RH, the center vertical channel audio signal CH, And 8.2 channel audio including a left woofer channel audio signal LFEL and a right woofer channel audio signal LFER respectively corresponding to a left channel woofer speaker and a right channel woofer speaker respectively disposed between left and right 30 to 90 degrees from the reference point. It may include receiving a signal.

1 is a diagram illustrating an audio system according to an embodiment of the present invention.
2 is a diagram illustrating an audio system according to another exemplary embodiment of the present invention.
3 is a diagram for describing a downmixing method of audio signals according to an exemplary embodiment of the present invention.
4 is a diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention.
5 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention.
6 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention.
7 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention.
8 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention.
FIG. 9 is a diagram for describing an audio system of 22.2 channels used in a downmixing method of audio signals according to another exemplary embodiment of the present invention.
10 is a diagram illustrating an audio system according to another embodiment of the present invention.
11 is another diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention.
12 is another diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention.
13 illustrates an audio system according to another embodiment of the present invention.
14 is another diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention.
15 is another diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention.
16 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention.
17 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention.
18 is another diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention.

Hereinafter, an audio system and a downmixing method of audio signals using the same will be described in detail with reference to the accompanying drawings.

In reproducing an audio signal, a 22.2 channel audio system has been developed for reproducing 22.2 channel audio signals using 24 loudspeakers to increase the realism and stereoscopic feeling that a user feels. The 22.2 channel audio system outputs 22.2 channel signals, that is, 24 independent audio signals, each through 24 speakers, thereby maximizing the realism and stereoscopic feeling that a user feels. However, since the number of speakers included in the 22.2 channel audio system is large, the production cost and power consumption of the audio system are increased, and a large installation space is required.

Hereinafter, an audio system and a method of downmixing audio signals using the same according to one or another embodiment of the present invention capable of providing almost the same realism and three-dimensionality as a 22.2 channel audio system while including only 10 to 12 speakers will be described in detail. do.

1 is a diagram illustrating an audio system according to an embodiment of the present invention.

Referring to FIG. 1, an audio system according to an exemplary embodiment of the present invention includes a horizontal speaker set 110 arranged as shown in FIG. 1A on a horizontal plane, and FIGS. 1B and (C) on a vertical plane. It includes a vertical speaker set 120, 130 disposed as follows. In addition, the audio system according to an embodiment of the present invention may further include a woofer speaker set arranged as shown in FIG.

1A illustrates a horizontal speaker set disposed in a horizontal plane of an audio system according to an exemplary embodiment of the present invention.

Referring to FIG. 1A, the horizontal speaker set 110 includes a center channel speaker C and a left channel speaker arranged around a sweet spot 111. ) L and right channel speaker R, and at least one first channel speaker 119 and at least one second channel speaker 118. Here, the sweet spot refers to a point where a listener who is a user of the audio system can listen to the optimized audio signal. The plurality of speakers included in the horizontal plane speaker set 110 may be disposed on the same distance line 117 from the sweet spot 111.

Hereinafter, on the horizontal plane, the point located in front of the sweet spot 111 is referred to as the reference point P1. Specifically, the reference point P1 is located at 0 degrees forward from the sweet spot 111 that is the reference position of the user.

The center channel speaker C is disposed at the reference point P1 which is 0 degrees forward of the horizontal plane.

The left channel speaker L and the right channel speaker C are disposed at the left and right 30 degrees A1 at the reference point P1, respectively. That is, the left channel speaker L is disposed on the front left side of the horizontal plane and outputs a left channel audio signal. The right channel speaker C is disposed at the front right side of the horizontal plane and outputs the right channel audio signal.

The at least one first channel speaker 119 and the at least one second channel speaker 118 are respectively disposed between the left and right 60 to 150 degrees A2 at the reference point P1. In detail, the first channel speaker 119 and the second channel speaker 118 may each include one or two speakers. FIG. 1A illustrates an example in which the first channel speaker 119 and the second channel speaker 118 each include two speakers.

In detail, the first channel speaker 119 includes a left side channel speaker LS and a left back channel disposed between the left 60 to 150 degrees A2 at the reference point P1. speaker) (LB). The left peripheral channel speaker LS is disposed at the front left side of the horizontal plane, and the left rear channel speaker LB is disposed at the rear left side of the horizontal plane.

Specifically, the left peripheral channel speaker LS is disposed adjacent to the left 60 degrees from the reference point P1 and outputs a left peripheral channel audio signal. In addition, the left rear channel speaker LB is disposed adjacent to 150 degrees left from the reference point P1 and outputs a left rear channel audio signal.

In addition, the second channel speaker 118 is a right side channel speaker RS and a right back channel speaker disposed between the right 60 to 150 degrees A2 from the reference point P1. (RB). The right peripheral channel speaker RS is disposed at the front right side of the horizontal plane and outputs the right peripheral channel audio signal. In addition, the right rear channel speaker LB is disposed at the rear right side of the horizontal plane and outputs the right rear channel audio signal.

Specifically, the right peripheral channel speaker RS is disposed adjacent to the right 60 degrees from the reference point P1. In addition, the right rear channel speaker RB is disposed adjacent to the right side 150 degrees from the reference point P1.

FIG. 1B is a plan view illustrating a vertical speaker set disposed in a vertical plane of an audio system according to an exemplary embodiment of the present invention. FIG. 1C is a diagram three-dimensionally illustrating a vertical speaker set disposed on a vertical plane of an audio system according to an exemplary embodiment of the present invention.

Referring to FIGS. 1B and 1C, the vertical surface speaker set 120 includes a left height channel speaker LH and a right height channel speaker RH. ), And a center height channel speaker (CH). The sweet spots 121 and 131 correspond to the sweet spot 111 of FIG. 1A. In FIG. 1C, the user is located in the sweet spot 131 as an example. In addition, the center channel speaker 135 disposed at the front 0 degree of the user corresponds to the center channel speaker C illustrated in FIG. 1A.

The left vertical channel speaker LH is disposed between 30 and 45 degrees B1 in the left horizontal direction at the reference point P1 (B1) and between 30 and 45 degrees in the vertical direction at the reference point P1 (B3). Output the signal.

The right vertical channel speaker RH is disposed between 30 and 45 degrees in the horizontal direction to the right at the reference point P1 (B1) and between 30 and 45 degrees in the vertical direction at the reference point P1 (B3), and the right vertical channel audio Output the signal.

The center vertical channel speaker CH is disposed between 90 and 150 degrees in the vertical direction from the reference point P1 and outputs a center vertical channel audio signal. In addition, as shown in FIG. 1B, the center vertical channel speaker CH is opposite to the reference point P1, that is, the point P2 and the sweet spot that are moved 180 degrees in the horizontal direction from the reference point P1. It is located on the line 127 connecting the spot 121.

In detail, the center vertical channel speaker CH may be disposed adjacent to the point P3 moved 90 degrees in the vertical direction from the reference point P1. When the center vertical channel speaker CH is disposed adjacent to the point P3, the center vertical channel speaker CH is positioned above the sweet spots 121 and 131 on the horizontal plane.

Alternatively, the center vertical channel speaker CH may be disposed adjacent to the point P4 moved 150 degrees in the vertical direction from the reference point P1. When the center vertical channel speaker CH is disposed adjacent to the point P4, the center vertical channel speaker CH is positioned above the point P2 on the horizontal plane.

FIG. 1D is a diagram illustrating a woofer speaker set that may be included in an audio system according to an embodiment of the present invention.

Referring to FIG. 1D, the woofer speaker set 140 includes at least one sub woofer speaker or a low frequency effect speaker. In detail, the woofer speaker set 140 may include one or two subwoofer speakers.

In detail, the woofer speaker set 140 may include a left channel woofer speaker LFEL and a right channel woofer speaker LFER disposed between left and right 30 to 90 degrees C1 at the reference point P1, respectively. The left channel woofer speaker LFEL and the right channel woofer speaker LFER output a left channel woofer audio signal and a right channel woofer audio signal, respectively. FIG. 1D illustrates an example in which the woofer speaker set 140 includes one subwoofer speaker LFEL and LFER in each of the left and right directions of a horizontal plane.

The audio system includes seven speakers in a horizontal plane as shown in FIG. 1A, three speakers in a vertical plane as shown in FIG. 1B, and in FIG. As illustrated, when two subwoofer speakers are included, audio signals of 10.2 channels may be output. In this case, the audio system is called a 10.2 channel audio system.

Alternatively, the woofer speaker set 140 may include any one of a left channel woofer speaker LFEL and a right channel woofer speaker LFER which are respectively disposed between the left and right 30 to 90 degrees at the reference point P1, and the left channel. An audio signal of any one of a woofer audio signal and a right channel woofer audio signal is output.

In addition, the audio system includes seven speakers in a horizontal plane as shown in FIG. 1A, three speakers in a vertical plane as shown in FIG. 1B, and one subwoofer speaker. When it includes, it can output the audio signals of 10.1 channels. In this case, the audio system is called a 10.1 channel audio system.

2 is a diagram illustrating an audio system according to another exemplary embodiment of the present invention.

Referring to FIG. 2, an audio system 200 according to another embodiment of the present invention may include an audio signal generator 210 and a speaker 220.

The audio signal generator 210 receives a predetermined audio signal and down mixes or upmixes the received audio signal according to the number of speakers included in the speaker unit 220. The audio signal input by the audio signal generator 210 is a multi-channel audio signal, and the number of channels included in the multi-channel audio signal may vary. For example, the audio signal generator 210 may receive an audio signal of 10.2 channels, an audio signal of 8.2 channels, an audio signal of 22.2 channels, an audio signal of 11.2 channels, or the like. In addition, the number of channels in the audio signal output from the audio signal generator 210 may vary depending on the number of speakers included in the speaker unit 220.

The speaker unit 220 may include a plurality of speakers (not shown) for implementing stereoscopic sound. Each of the speakers provided in the speaker unit 220 outputs audio signals corresponding to different channels. The speaker unit 220 may include the speakers described above with reference to FIG. 1. That is, the speaker unit 220 may include a plurality of speakers illustrated in (a), (b), (c), and (d) of FIG. 1.

In addition, the speaker unit 220 may include six speakers capable of outputting 5.1 channels, eight speakers capable of outputting 7.1 channels, or two speakers capable of outputting two channels.

For example, when the audio system 200 receives audio signals of 10.2 channels and the speaker unit 220 includes six speakers to output 5.1 channels, the audio signal generator 210 may generate 10.2 channels. Down-mix the audio signals of the audio signals into 5.1 channel audio signals. Then, the speaker unit 220 outputs each of the 5.1 channel audio signals generated by the audio signal generator 210 through six speakers.

The downmixing operation performed by the audio signal generator 210 will be described in detail with reference to FIGS. 3 to 7. 3 to 8 illustrate an example in which the audio signal generator 210 receives the 10.2 channel audio signals described above with reference to FIG. 1 and performs a down mixing operation.

In addition, hereinafter, since the predetermined channel audio signal corresponds to a predetermined channel speaker, the predetermined channel audio signal is denoted by the same symbol as the aforementioned predetermined channel speaker. For example, a left channel audio signal corresponding to the left channel speaker L and output through the left channel speaker L is illustrated as a 'left channel audio signal L'.

3 to 9, 11 to 12, and 14 to 18 are diagrams illustrating a down mixing method of audio signals according to one or more embodiments of the present invention, in the audio system 200 shown in FIG. 2. Can be performed. In detail, in the downmixing method of audio signals according to an embodiment of the present invention, the audio signal generator 210 receives the multi-channel audio signal described above with reference to FIG. 1 and the audio signal generator ( And 210 downmixing the received audio signal to a predetermined multi-channel to generate a downmixed signal. Hereinafter, the configuration of the downmixing step in which the audio signal generator 210 performs the audio signal will be described in detail with reference to FIGS. 3 to 9, 11 to 12, and 14 to 18.

3 is a diagram for describing a downmixing method of audio signals according to an exemplary embodiment of the present invention.

3A illustrates an example of speakers included in the speaker unit 220. 3B illustrates an example of a down mixing operation performed by the audio signal generator 210.

Referring to FIG. 3A, the speaker unit 220 may include eight speakers L, R, C, SL, SR, LB, RB, and LFE disposed around the sweet spot 301. Can be. That is, the speaker unit 220 may output an audio signal of 7.1 channels. Since FIG. 3A corresponds to the horizontal speaker set 110 shown in FIG. 1A except for the subwoofer speaker LFE, detailed description thereof will be omitted. The subwoofer speaker LFE corresponds to any one of the left channel woofer speaker LFEL and the right channel woofer speaker LFER included in the woofer speaker set 140 shown in FIG. 1D.

In the equation described in FIG. 3B, the audio signals described in the left term 321 represent down mixing signals, which are audio signals that are downmixed and output, and the audio signals described in the right term 325 before downmixing. Represents the channel-specific audio signals included in the input multi-channel audio signals.

Specifically, (b) of FIG. 3 is adjacent to the point P4 of the input audio signals (10.2 channel audio signals) in which the center vertical channel speaker CH is moved 150 degrees in the vertical direction from the reference point P1. And a down mixing equation when the center vertical channel audio signal CH corresponds to the speaker disposed at the point P4.

Referring to FIG. 3B, the downmix signal is generated based on at least one predetermined channel audio signal output through at least one speaker located on the same or adjacent vertical line in the input audio signal. In detail, the down mixing signal may include predetermined coefficients (a, c, and the like) to at least one predetermined channel audio signal output through at least one speaker located on the same or adjacent vertical line among the audio signals input to the audio system 200. It can be calculated by multiplying by k, l).

In addition, when only one speaker is provided on the same or adjacent vertical line, the aforementioned summation is not performed. For example, when only the center channel speaker C is provided in the vertical up and down direction of the reference point P1, the center channel audio signal, which is a downmixing signal, is multiplied by a predetermined coefficient a by multiplying the center channel audio signal C of 10.2 channels. (C) is generated.

Here, the predetermined coefficients (a, c, k, l) to be multiplied by each audio signal in the downmixing formula depend on the product specifications or design specifications such as the overall sound level, the maximum rated output, etc. of the audio system 200. Can vary. For example, when a, c, k, and l all have a value of 1, it means that downmixing is performed without a separate sound level adjustment.

For example, referring to FIGS. 1A and 1B, a left vertical channel speaker LH is disposed in a vertical upper portion adjacent to the left channel speaker L. Referring to FIGS. Accordingly, referring to Equation 331, the left channel audio signal L output through the left channel speaker 311 is obtained by multiplying the left channel audio signal L by a predetermined coefficient a in the 10.2 channel and the left channel in the 10.2 channel. The vertical channel audio signal LH is generated by adding up the product of a predetermined coefficient c.

Referring to FIG. 3B, a right channel audio signal R, a center channel audio signal C, a left peripheral channel audio signal LS, a right peripheral channel audio signal RS, and a left mixing signal which are down mixing signals Each of the rear channel audio signal LB, the right rear channel audio signal RB, and the woofer channel audio signal LFE may be calculated by the downmixing equation shown in FIG. Since the down mixing equation is clearly shown in FIG. 3B, detailed description is omitted.

In FIG. 3B, when the center vertical channel audio signal CH is a signal corresponding to the speaker disposed at the point P4 in the 10.2 channel audio signal, the center vertical channel audio signal CH is located on an adjacent vertical plane. It affects the left rear channel audio signal LB and the right rear channel audio signal RB outputted to the. Specifically, as shown in (b) of FIG. 3, the left rear channel audio signal LB generated by down mixing is obtained by multiplying the left rear channel audio signal LB by a predetermined coefficient a from the 10.2 channel audio signal. The value is calculated by adding the value obtained by multiplying the center vertical channel audio signal CH by a predetermined coefficient c and a predetermined constant from the 10.2 channel audio signal.

4 is a diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention. In addition, FIG. 4 illustrates an example in which the audio signal generator 210 receives the 10.2 channel audio signals described above with reference to FIG. 1 and performs a down mixing operation.

4A illustrates another example of the speakers included in the speaker unit 220. 4B illustrates another example of the downmixing operation performed by the audio signal generator 210.

Referring to FIG. 4A, the speaker unit 220 may include eight speakers L, R, C, SL, SR, LB, RB, and LFE disposed around the sweet spot 401. Can be. Since FIG. 4A is the same as that of FIG. 3A, detailed description is omitted.

In the equation described in FIG. 4B, the audio signals described in the left term represent down mixing signals, which are audio signals that are down mixed and output, and the audio signals described in the right term represent input audio signals before downmixing. .

Specifically, (b) of FIG. 4 is adjacent to the point P3 of the input audio signals (10.2 channel audio signals) in which the center vertical channel speaker CH is moved 90 degrees in the vertical direction from the reference point P1. And a down mixing equation when the center vertical channel audio signal CH corresponds to the speaker arranged at the point P3.

In FIG. 4B, when the center vertical channel audio signal CH is a signal output from the point P3 in the 10.2 channel audio signal, the center vertical channel audio signal CH is output on the same or adjacent vertical plane. The left peripheral channel audio signal LS and the right peripheral channel audio signal RS are affected. Specifically, as shown in (b) of FIG. 4, the left peripheral channel audio signal LS generated by downmixing is a value obtained by multiplying the left peripheral channel audio signal LS by a predetermined coefficient a from a 10.2 channel audio signal. And 10.2 channel audio signals are calculated by adding the center vertical channel audio signal CH multiplied by a predetermined coefficient c and a predetermined constant.

Referring to FIG. 4B, the right channel audio signal R, the center channel audio signal C, the left peripheral channel audio signal LS, the right peripheral channel audio signal RS, and the left mixed down signal are output. Each of the rear channel audio signal LB, the right rear channel audio signal RB, and the woofer channel audio signal LFE may be calculated by the downmixing equation illustrated in FIG. 4B. Since the down mixing equation is clearly shown in FIG. 4B, detailed description thereof will be omitted.

5 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention.

In addition, FIG. 5 illustrates an example in which the audio signal generator 210 receives the 10.2 channel audio signals described above with reference to FIG. 1 and downmixes the signals to 7.1 channels.

5A illustrates another example of the speakers included in the speaker unit 220. 5B illustrates another example of the downmixing operation performed by the audio signal generator 210.

Referring to FIG. 5A, the speaker unit 220 may include eight speakers L, R, C, SL, SR, LB, RB, and LFE disposed around the sweet spot 501. Can be. Since FIG. 3A is the same as FIG. 3A, detailed description is omitted.

In the downmixing equation described in other drawings of this application including FIG. 5B, the audio signals described in the left term represent downmixed signals which are audio signals that are downmixed and output, and the audio signals described in the right term Indicates input audio signals before downmixing.

Specifically, FIG. 5B illustrates a predetermined point (not shown) of the center vertical channel speaker CH among the input audio signals (10.2 channel audio signals) between 90 degrees and 150 degrees in the vertical direction from the reference point P1. Down mixing equation when the center vertical channel audio signal CH is a signal corresponding to a speaker disposed at a predetermined point (not shown) between 90 degrees and 150 degrees in the vertical direction from the reference point P1. Indicates.

In FIG. 5B, the predetermined coefficients a, c, d, and f used in the downmixing equation may be optimally set according to an angle at which the vertical channel speakers CH are arranged. 10.2 channel input audio signal Center vertical channel audio signal CH included in the center vertical channel when output through a speaker disposed at a predetermined point (not shown) between 90 degrees and 150 degrees in the vertical direction from the reference point (P1) The audio signal CH may affect all of the left peripheral channel audio signal LS, the right peripheral channel audio signal RS, the left rear channel audio signal LB, and the right rear channel audio signal RB. Therefore, when calculating the left peripheral channel audio signal LS, the right peripheral channel audio signal RS, the left rear channel audio signal LB, and the right rear channel audio signal RB which are the down mixing signals described in the left section, The central vertical channel audio signal CH included in the input audio signal is reflected as in the downmixing equation described in FIG.

Referring to FIG. 5B, the right channel audio signal R, the center channel audio signal C, the left peripheral channel audio signal LS, the right peripheral channel audio signal RS, and the left mixed down signal are output. Each of the rear channel audio signal LB, the right rear channel audio signal RB, and the woofer channel audio signal LFE may be calculated by the downmixing equation shown in FIG.

The downmixing equation used to downmix the 10.2 channel audio signal to the 7.1 channel audio signal is clearly shown in FIG. 5 (b), and thus a detailed description thereof will be omitted.

6 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention. Specifically, FIG. 6A illustrates another example of the speakers included in the speaker unit 220. 6B illustrates another example of the downmixing operation performed by the audio signal generator 210.

Referring to FIG. 6A, the speaker unit 220 may include six speakers L, R, C, SL, SR, and LFE disposed around the sweet spot 601. That is, the speaker unit 220 may output an audio signal of 5.1 channels. The center channel speaker C, the left channel speaker L, and the right channel speaker R shown in FIG. 6A are respectively the center channel speaker C and the left channel speaker described in FIG. Since it corresponds to L) and the right channel speaker R, detailed description is abbreviate | omitted.

In FIG. 6A, the left peripheral channel speaker LS and the right peripheral channel speaker RS are respectively located between the left and right 100 to 120 degrees at the reference point P1 at which the center channel speaker C is disposed. Is placed. In addition, the speaker unit 220 capable of outputting 5.1 channels includes one subwoofer speaker (LFE).

When the speaker unit 220 outputs an audio signal of 5.1 channels, the audio signal generator 210 downmixes an input audio signal of 10.2 channels into a 5.1 channel audio signal.

Referring to FIG. 6B, the left channel audio signal L, the right channel audio signal R, the center channel audio signal C, the left peripheral channel audio signal LS, and the right included in the down mixing signal are included. Each of the peripheral channel audio signal RS and the woofer channel audio signal LFE may be calculated by the downmixing equation illustrated in FIG. 6B.

Specifically, the left peripheral channel speaker LS of the 5.1 channel shown in (a) of FIG. 6 is the left peripheral channel speaker LS and the left rear channel speaker LB included in the 10.2 channel audio system of FIG. 1. ) And a center vertical channel speaker (CH) in space.

Accordingly, referring to Equation 611, the left peripheral channel audio signal LS of the 5.1 channel is connected to the left peripheral channel audio signal LS, the left rear channel audio signal LB, and the center vertical channel audio signal CH of the 10.2 channel. Can be calculated based on this.

The downmixing equation used for downmixing the 10.2 channel audio signal to the 5.1 channel audio signal is clearly shown in FIG. 6B, and thus a detailed description thereof will be omitted.

7 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention. Specifically, FIG. 7A illustrates another example of the speakers included in the speaker unit 220. FIG. 7B illustrates another example of the downmixing operation performed by the audio signal generator 210.

Referring to FIG. 7A, the speaker unit 220 may include two speakers L and R disposed around the sweet spot 701. That is, the speaker unit 220 may output an audio signal of 2.0 channels. Since the left channel speaker L and the right channel speaker R shown in FIG. 7A correspond to the left channel speaker L and the right channel speaker R described with reference to FIG. Detailed description will be omitted.

When the speaker unit 220 outputs an audio signal of 2.0 channels, the audio signal generator 210 downmixes an audio signal of 10.2 channels, which is an input audio signal, into an audio signal of 2.0 channels.

Referring to FIG. 7B, each of the left channel audio signal L and the right channel audio signal R which are down mixed and output may be calculated by the down mixing equation shown in FIG. 7 b. have.

Specifically, in the speakers included in the 10.2 channel audio system illustrated in FIG. 1, the left channel speaker L of the 2.0 channel illustrated in FIG. 7A is a 10.2 channel audio system illustrated in FIG. 1. The left channel speaker L, the left peripheral channel speaker LS, the left rear channel speaker LB, the left vertical channel speaker LH, and the center vertical channel speaker CH included in the left side of the reference point P1 at And space correspondence.

Therefore, referring to Equation 711, the left channel audio signal L of the 2.0 channel is the left channel audio signal L of the 10.2 channel, the left peripheral channel audio signal LS, the left rear channel audio signal LB, the left vertical of the channel. It may be calculated based on the channel audio signal LH and the center vertical channel audio signal CH.

The downmixing equation used to downmix the 10.2 channel audio signal to the 2.0 channel audio signal is clearly shown in FIG. 7B, and thus detailed description thereof will be omitted.

8 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention. The downmixing method described with reference to FIG. 8 may be performed in the audio signal generator 210 in the audio system 200 described with reference to FIG. 2. 8A, the speaker unit 220 of the audio system 200 includes twelve speakers capable of outputting 10.2 channels as an example.

Referring to FIG. 8A, the speaker unit 220 includes seven speakers L, R, C, SL, SR, LB, and RB disposed around the sweet spot 801. In addition, the speaker unit 220 includes three speakers LH, RH, and CH disposed on a vertical vertical surface of the sweet spot 801. It also includes a left channel woofer speaker (LFEL) and a right channel woofer speaker (LFER). However, in FIG. 8A, the left channel woofer speaker LFEL and the right channel woofer speaker LFER corresponding to the speakers illustrated in FIG. 1D are omitted.

Since the seven speakers arranged on the plane 805 correspond to the speakers described with reference to FIG. 1A, detailed descriptions thereof will be omitted. In addition, three speakers disposed on the vertical surface 803 correspond to the speakers described with reference to FIG.

Referring to FIG. 8B, the audio signal generator 210 of the audio system 200 receives an audio signal of 22.2 channels, and downmixes the input 22.2 channel audio signal to generate an audio signal of 10.2 channels. The downmixing formulas used to do this are described. The downmixing method of an audio signal according to another embodiment of the present invention downmixes an audio signal of 22.2 channels into an audio signal of 10.2 channels according to the downmixing equation described in FIG. The configuration of the speakers outputting the 22.2 channel audio signal and the 22.2 channel audio signal will be described in detail with reference to FIG. 9.

In addition, the predetermined coefficients (m, t, b, k, l) described in the downmixing formula of FIG. 8 (b) may correspond to the predetermined coefficients (a, c, k, l) described in FIG. Similarly, it may vary depending on product specifications or design specifications, such as the overall sound level, maximum rated power, and the like of the audio system 200.

FIG. 9 is a diagram for describing an audio system of 22.2 channels used in a downmixing method of audio signals according to another exemplary embodiment of the present invention.

9A illustrates an audio system for outputting audio signals of 10.2 channels. 9B illustrates an audio system for outputting audio signals of 22.2 channels. FIG. 9C is a diagram illustrating in detail an audio system that outputs 22.2 channel audio signals. The 22.2 channel audio signals include 22 general band audio signals and two low frequency effect (LFE) audio signals.

Since the audio system for outputting audio signals of the 10.2 channel shown in FIG. 9A corresponds to the audio system described with reference to FIG. 1, a detailed description thereof will be omitted.

Referring to FIG. 9B, a 22.2 channel audio system may include 22 speakers outputting 20 general band audio signals and 2 woofer speakers outputting 2 low frequency effect (LFE) audio signals. Include. In FIG. 9B, first to twenty-second channel speakers 1ch to 22ch, which are 22 speakers, are illustrated, and two woofer speakers are not shown.

Referring to FIG. 9C, the aforementioned 20 general band audio signals include three layers, an upper layer 931, a middle layer 941, and a lower layer ( 95 speakers are output through the 20 speakers.

In detail, the upper layer 931 includes an upper front left channel speaker 11 that outputs an upper front left channel audio signal (TpFL) and an upper front center channel audio signal (TpFC: Top Front Center). ), The upper front center channel speaker 12 outputting the upper front right channel audio signal (TpFR: Top Front Right), and the upper peripheral left channel audio signal (TpSiL: Top Side Left) Outputs the upper peripheral left channel speaker 14, which outputs the upper center channel speaker signal 15 (TpC: Top Center), and the upper peripheral right channel audio signal (TpSiR: Top Side Right) which outputs Outputs an upper rear right channel speaker 16, an upper rear left channel speaker 17 that outputs an upper rear left channel audio signal (TpBL), and an upper rear center channel audio signal (TpBC: Top Back Center) Upper rear center A null speaker 18 and an upper rear right channel speaker 19 that outputs an upper back right channel audio signal (TpBR) are shown in FIGS. 9B and 9C. Is placed.

In addition, the middle layer 941 has a front left channel speaker 1 for outputting front left channel audio signals (FL) and a front left center channel for outputting front left center channel audio signals (FLc). Speaker 2, front center channel speaker 3 for outputting front center channel audio signal (FC: Front Center), front right center channel speaker 4 for outputting front right center channel audio signal (FRc: Front Right center) ), Front right channel speaker (5) outputting front right channel audio signal (FR: Front Right), peripheral left channel speaker (6) outputting peripheral left channel audio signal (SiL: Side Left), peripheral right channel audio Peripheral right channel speaker 7 outputting a signal (SiR: Top Side Right), rear left channel speaker 8 outputting a rear left channel audio signal (BL: Back Left), and rear center channel audio signal (BC: Back Rear center channel speaker (center) 9), and a rear right channel speaker 10 for outputting a rear right channel audio signal BR is arranged as shown in Figs. 9B and 9C.

The lower layer 951 further includes a lower front left channel speaker 20 for outputting a lower front left channel audio signal (BtFL: Bottom Front Left) and a lower front center channel audio signal (BtFC: Bottom Front Center). Outputs the front center channel speaker 21, the lower front right channel speaker 22 that outputs the lower front right channel audio signal (BtFR: Bottom Front Right), and the first woofer channel audio signal (LFE1: Low Frequency Effect 1). And a second woofer speaker 24 for outputting a first woofer speaker 23 and a second woofer channel audio signal LFE2 (Low Frequency Effect 2).

Specifically, referring to FIGS. 9B and 9C, the upper center channel audio signal TpC, which is an audio signal corresponding to the fifteenth channel 15ch, is output on the sweet spot 901. A top center (TpC) channel speaker 15 is disposed.

The downmixing equation used to receive 22.2 channel audio signals and downmix them into 10.2 channel signals is clearly described in FIG. 8B, and thus a detailed description thereof will be omitted.

10 is a diagram illustrating an audio system according to another embodiment of the present invention.

Referring to FIG. 1A, at least one first channel speaker 119 included in a horizontal speaker set of an audio system according to another exemplary embodiment of the present invention may have a left 100 to 120 degrees A1 at a reference point P1. It may include a left peripheral channel speaker (LS) disposed between). In addition, the at least one second channel speaker 118 may include a right peripheral channel speaker RS disposed between the right 100 to 120 degrees A1 at the reference point P1. That is, according to another embodiment of the present invention, an audio system includes a horizontal speaker set shown in FIG. 10, a vertical speaker set shown in FIGS. 1B and 1C, and a woofer speaker shown in FIG. 1C. It can include a set. Accordingly, an audio system according to another embodiment of the present invention includes five speakers in a horizontal speaker set, three in a vertical speaker set, and two speakers in a woofer speaker set. That is, a total of eight speakers (five in the horizontal speaker set + three in the vertical speaker set) + two speakers (two in the woofer speaker set) may be included, and audio signals of 8.2 channels may be output.

The center channel speaker C, the left channel speaker L, and the right channel speaker R shown in FIG. 10 are the center channel speaker C, the left channel speaker L, and the right channel speaker described in FIG. Since it corresponds to the same as the channel speaker R, detailed description thereof will be omitted.

11 and 12, the audio system 200 receives down the audio signals of the 8.2 channel described above in FIG. 10 and down mixes the audio signals according to other embodiments of the present invention for downmixing them to audio signals of 5.1 or 2.0. Explain the mixing method.

11 is another diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention.

FIG. 11A illustrates speakers capable of outputting an audio signal of 5.1 channels, which are speakers included in the speaker unit 220. Since FIG. 11A corresponds to the same as FIG. 6A, detailed descriptions thereof will be omitted.

FIG. 11B illustrates a downmixing method according to another embodiment of the present invention, in which downlink audio signals of 8.2 channels described in FIG. 10 are generated to generate 5.1 channel audio signals. When the speaker unit 220 outputs an audio signal of 5.1 channels, the audio signal generator 210 downmixes an audio signal of 8.2 channels, which is an input audio signal, into an audio signal of 5.1 channels.

Referring to FIG. 11B, the left channel audio signal L, the right channel audio signal R, the center channel audio signal C, the left peripheral channel audio signal LS, and the right peripheral are down mixed and output. Each of the channel audio signal RS and the woofer channel audio signal LFE may be calculated by the downmixing equation illustrated in FIG. 11B. The downmixing equation used for downmixing the 8.2-channel audio signal to the 5.1-channel audio signal is clearly shown in FIG. 11B, and thus a detailed description thereof will be omitted.

12 is another diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention. Specifically, FIG. 12A illustrates another example of the speakers included in the speaker unit 220. 12B illustrates another example of the downmixing operation performed by the audio signal generator 210.

Referring to FIG. 12A, the speaker unit 220 may include two speakers L and R disposed around the sweet spot 1201. That is, the speaker unit 220 may output an audio signal of 2.0 channels. 12 (a) corresponds to the same as that of FIG. 7 (a), and thus detailed description thereof will be omitted. In addition, the audio system 200, specifically, the audio signal generator 210 receives an audio signal of 8.2 channels, and outputs the down mixed signal obtained by downmixing the audio signal to the speaker unit 220.

When the speaker unit 220 outputs an audio signal of 2.0 channels, the audio signal generator 210 downmixes an audio signal of 8.2 channels, which is an input audio signal, into an audio signal of 2.0 channels.

Referring to FIG. 12B, each of the left channel audio signal L and the right channel audio signal R which are down mixed and output may be calculated by the down mixing equation shown in FIG. 12B. have.

Specifically, the left channel speaker L of the 2.0 channel shown in (a) of FIG. 12 is a left channel speaker L which is speakers included in the left side of the reference point P1 in the 8.2 channel audio system described with reference to FIG. It spatially corresponds to the left peripheral channel speaker LS, the left vertical channel speaker LH, and the center vertical channel speaker CH.

Therefore, referring to the first equation described in FIG. It may be calculated based on the channel audio signal LH and the center vertical channel audio signal CH.

The downmixing equation used for downmixing the 8.2-channel audio signal to the 2.0-channel audio signal is clearly shown in FIG. 12B, and thus a detailed description thereof will be omitted.

13 illustrates an audio system according to another embodiment of the present invention. Specifically, FIG. 13A illustrates a horizontal speaker set disposed in a horizontal plane of an audio system according to another exemplary embodiment of the present invention. FIG. 13B is a plan view illustrating a vertical speaker set disposed in a vertical plane of an audio system according to another exemplary embodiment of the present invention. FIG. 13C is a diagram three-dimensionally illustrating a vertical speaker set disposed in a vertical plane of an audio system according to another exemplary embodiment of the present invention. FIG. 13D is a diagram illustrating a woofer speaker set that may be included in an audio system according to an embodiment of the present invention.

Referring to FIG. 13, an audio system according to another exemplary embodiment of the present invention includes a horizontal speaker set 1310 arranged as shown in FIG. 13A on a horizontal plane, and FIGS. 13B and 13C on a vertical plane. A vertical speaker set 1320 and 1330 disposed as shown in FIG. In addition, the audio system according to an embodiment of the present invention may further include a woofer speaker set arranged as shown in FIG. (A) and (d) of FIG. 13 correspond to the same as (a) and (d) of FIG. 1, respectively, and thus detailed description thereof will be omitted.

Referring to FIG. 13A, the horizontal speaker set 1310 is the same as the horizontal speaker set 110 described with reference to FIG. 1A, and seven speakers C, L, R, LS, RS, and LB. , RB) or five speakers C, L, R, LS, and RS. FIG. 13A illustrates an example in which the horizontal plane speaker set 1310 includes seven speakers C, L, R, LS, RS, LB, and RB.

Referring to FIGS. 13B and 13C, the vertical surface speaker sets 1320 and 1330 are between 30 and 45 degrees left and right at the reference point (P1) (B12) and 30 to 45 in the vertical direction at the reference point (P1). A left vertical channel speaker LH and a right vertical channel speaker RH are disposed between the diagrams B3, respectively.

The left and right vertical speaker sets 1320 and 1330 are disposed at 135 to 150 degrees in the horizontal direction B22 at the reference point P1 and at 135 to 150 degrees in the vertical direction B4 at the reference point P1, respectively. Vertical channel speakers (LBH: Left Back Height) and right rear vertical channel speakers (RBH: Right Back Height).

A speaker system according to another embodiment of the present invention illustrated in FIG. 13 includes a total of eleven general frequencies when seven speakers C, L, R, LS, RS, LB, and RB are included in the horizontal speaker set 1310. Speakers that output audio signals in the band, that is, seven speakers (C, L, R, LS, RS, LB, RB) in the horizontal plane set 1310 and four speakers in the vertical plane set 1320, 1330. (LH, RH, LBH, RBH) are included. In addition, speakers that output audio signals of two low frequency bands, that is, left channel woofer speaker LFEL and right channel woofer speaker LFER, are included. Thus, the speaker system shown in FIG. 13 can output audio signals of 11.2 channels.

Hereinafter, a downmixing method according to another exemplary embodiment of downmixing audio signals of 11.2 channels described with reference to FIG. 13 into 7.1, 5.1, or 2.0 channels will be described in detail with reference to FIGS. 14 to 16.

14 is another diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention. In addition, FIG. 14 illustrates an example in which the audio signal generator 210 receives the 11.2 channel audio signals described above with reference to FIG. 13 and down mixes the 7.1 channel audio signals.

14A illustrates another example of the speakers included in the speaker unit 220. 14B illustrates another example of the downmixing operation performed by the audio signal generator 210.

Referring to FIG. 14A, the speaker unit 220 may include eight speakers L, R, C, SL, SR, LB, RB, and LFE disposed around the sweet spot 1401. Can be. Since FIG. 14A is the same as FIG. 3A, detailed description is omitted.

Referring to FIG. 14B, the left channel audio signal L, the right channel audio signal R, the center channel audio signal C, the left peripheral channel audio signal LS, and the right peripheral are down mixed and output. Each of the channel audio signal RS, the left rear channel audio signal LB, the right rear channel audio signal RB, and the woofer channel audio signal LFE may be calculated by the downmixing equation shown in FIG. Can be. Since the down mixing equation is clearly shown in FIG. 14B, detailed description is omitted.

15 is another diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention. Specifically, FIG. 15A illustrates another example of the speakers included in the speaker unit 220. 15B illustrates another example of the downmixing operation performed by the audio signal generator 210.

Referring to FIG. 15A, the speaker unit 220 may include six speakers L, R, C, SL, SR, and LFE disposed around the sweet spot 1501. That is, the speaker unit 220 may output an audio signal of 5.1 channels. Since FIG. 15A corresponds to FIG. 6A in the same manner, detailed description thereof will be omitted.

When the speaker unit 220 outputs an audio signal of 5.1 channels, the audio signal generator 210 downmixes an input audio signal of 11.2 channels into an audio signal of 5.1 channels.

Referring to FIG. 15B, the left channel audio signal L, the right channel audio signal R, the center channel audio signal C, the left peripheral channel audio signal LS, and the right peripheral are down mixed and output. Each of the channel audio signal RS and the woofer channel audio signal LFE may be calculated by the downmixing equation illustrated in FIG. 15B. The downmixing equation used to downmix the 11.2 channel audio signal to the 5.1 channel audio signal is clearly shown in FIG. 15B, and thus a detailed description thereof will be omitted.

16 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention. FIG. 16A illustrates another example of the speakers included in the speaker unit 220. FIG. 16B illustrates another example of the downmixing operation performed by the audio signal generator 210.

Referring to FIG. 16A, the speaker unit 220 may include two speakers L and R disposed around the sweet spot 1601. That is, the speaker unit 220 may output an audio signal of 2.0 channels. Since FIG. 16A corresponds to FIG. 7A, detailed description is omitted.

When the speaker unit 220 outputs an audio signal of 2.0 channels, the audio signal generator 210 downmixes an audio signal of 11.2 channels, which is an input audio signal, into an audio signal of 2.0 channels.

Referring to FIG. 16B, each of the left channel audio signal L and the right channel audio signal R which are down mixed and output may be calculated by the down mixing equation shown in FIG. 16B. have.

In addition, the audio system according to another embodiment of the present invention described with reference to FIG. 13 includes five speakers L in the horizontal plane speaker set 1310 except for the left rear channel speaker LB and the right rear channel speaker RB. , R, C, SL, SR) may be included only. That is, the horizontal speaker set 1310 included in the audio system according to another exemplary embodiment described with reference to FIG. 13 may be formed like the speakers illustrated in FIG. 10. In this case, a total of 11 speakers ((L, R, C, SL, SR / LH, RH, LBH, RBH / LFEL, LFER) are included in the audio system, and the audio system outputs 9.2 channel audio signals. can do.

Hereinafter, a downmixing method according to another embodiment of the present invention for downmixing the aforementioned 9.2 channel audio signals to 5.1 or 2.0 channels will be described in detail with reference to FIGS. 17 to 18.

17 is another diagram for explaining a downmixing method of audio signals according to another exemplary embodiment of the present invention. Specifically, FIG. 17A illustrates another example of the speakers included in the speaker unit 220. FIG. 17B illustrates another example of the downmixing operation performed by the audio signal generator 210.

Referring to FIG. 17A, the speaker unit 220 may include six speakers L, R, C, SL, SR, and LFE disposed around the sweet spot 1701. That is, the speaker unit 220 may output an audio signal of 5.1 channels. Since FIG. 17A corresponds to FIG. 6A in the same manner, detailed description thereof will be omitted.

When the speaker unit 220 outputs an audio signal of 5.1 channels, the audio signal generator 210 downmixes an audio signal of 9.2 channels, which is an input audio signal, into an audio signal of 5.1 channels.

Referring to FIG. 17B, the left channel audio signal L, the right channel audio signal R, the center channel audio signal C, the left peripheral channel audio signal LS, and the right peripheral are down mixed and output. Each of the channel audio signal RS and the woofer channel audio signal LFE may be calculated by the downmixing equation illustrated in FIG. 17B. The downmixing equation used to downmix the 9.2 channel audio signal to the 5.1 channel audio signal is clearly shown in FIG. 17B, and thus a detailed description thereof will be omitted.

18 is another diagram for describing a downmixing method of audio signals according to another exemplary embodiment of the present invention.

FIG. 18A illustrates another example of the speakers included in the speaker unit 220. 18B illustrates another example of the downmixing operation performed by the audio signal generator 210.

Referring to FIG. 18A, the speaker unit 220 may include two speakers L and R disposed around the sweet spot 1801. That is, the speaker unit 220 may output an audio signal of 2.0 channels. Since FIG. 18A corresponds to FIG. 7A, detailed description is omitted.

When the speaker unit 220 outputs an audio signal of 2.0 channels, the audio signal generator 210 downmixes an audio signal of 9.2 channels, which is an input audio signal, into an audio signal of 2.0 channels.

Referring to FIG. 18B, each of the left channel audio signal L and the right channel audio signal R which are down mixed and output may be calculated by the down mixing equation shown in FIG. 18B. have.

The above-described audio system and the downmixing method of audio signals using the same according to an embodiment of the present invention can maximize the realism and three-dimensionality experienced by the user. Specifically, the audio system according to one or another embodiment of the present invention uses only speakers capable of outputting audio signals of 10.2, 8.2, 11.2 or 9.2 channels, and provides a sense of presence that a 22.2 channel audio system can provide. It is possible to provide a realistic and three-dimensional effect of the same or very similar to the three-dimensional effect.

In addition, the downmixing method according to one or another embodiment of the present invention down-mixes audio signals of 10.2, 8.2, 11.2 or 9.2 channels into 7.1, 5.1, or 2.0 channels of audio signals, thereby providing realism and It can maintain compatibility with existing multichannel audio systems while minimizing the reduction of stereoscopic effects.

The above description is only one embodiment of the present invention, and those skilled in the art may implement the present invention in a modified form without departing from the essential characteristics of the present invention. Therefore, the scope of the present invention should be construed to include various embodiments which are not limited to the above-described examples but are within the scope equivalent to those described in the claims.

200: audio system
210: audio signal generator
220: speaker part

Claims (24)

A center channel speaker disposed at a reference point that is 0 degrees forward of the horizontal plane, a left channel speaker and a right channel speaker disposed at left and right 30 degrees from the reference point, respectively, and at least one first disposed between 60 to 150 degrees left and right at the reference point; A horizontal speaker set comprising a channel speaker and at least one second channel speaker; And
A left vertical channel speaker and a right vertical channel speaker respectively disposed between the left and right 30 to 45 degrees at the reference point and between 30 and 45 degrees in the vertical direction from the reference point, and between 90 and 150 degrees in the vertical direction from the reference point And a set of vertical plane speakers comprising a center vertical channel speaker. The method of claim 1,
The at least one first channel speaker
It includes a left peripheral channel speaker and a left rear channel speaker disposed between the left 60 to 150 degrees from the reference point,
The at least one second channel speaker
And a right peripheral channel speaker and a right rear channel speaker disposed between right and right 60 to 150 degrees from the reference point. The method of claim 2,
The left peripheral channel speaker is disposed adjacent to the left 60 degrees from the reference point,
The left rear channel speaker is disposed adjacent to the left 150 degrees from the reference point,
The right peripheral channel speaker is disposed adjacent to the right 60 degrees from the reference point,
And the right rear channel speaker is disposed adjacent the right 150 degrees from the reference point. The method of claim 1,
And a woofer speaker set comprising at least one subwoofer speaker. The method of claim 4, wherein the woofer speaker set
And a left channel woofer speaker and a right channel woofer speaker respectively disposed between the left and right 30 to 90 degrees at the reference point. The method of claim 4, wherein the woofer speaker set
And one of a left channel woofer speaker and a right channel woofer speaker respectively disposed between the left and right 30 to 90 degrees at the reference point. The method of claim 1, wherein the first channel speaker and the second channel speaker
And a left peripheral channel speaker and a right peripheral channel speaker disposed between the left and right 100 to 120 degrees at the reference point, respectively. A center channel speaker disposed at a reference point that is 0 degrees forward of the horizontal plane, a left channel speaker and a right channel speaker disposed at left and right 30 degrees from the reference point, respectively, and at least one first disposed between 60 to 150 degrees left and right at the reference point; A horizontal speaker set comprising a channel speaker and at least one second channel speaker; And
A left vertical channel speaker and a right vertical channel speaker respectively disposed between the left and right 30 to 45 degrees at the reference point and between 30 and 45 degrees in the vertical direction from the reference point, and between the left and right 135 to 150 degrees and the vertical at the reference point And a vertical set of speakers comprising a left rear vertical channel speaker and a right rear vertical channel speaker disposed between 135 and 150 in the direction. The method of claim 8,
The at least one first channel speaker
It includes a left peripheral channel speaker and a left rear channel speaker disposed between the left 60 to 150 degrees from the reference point,
The at least one second channel speaker
And a right peripheral channel speaker and a right rear channel speaker disposed between right and right 60 to 150 degrees from the reference point. The method of claim 8,
The left peripheral channel speaker is disposed adjacent to the left 60 degrees from the reference point,
The left rear channel speaker is disposed adjacent to the left 150 degrees from the reference point,
The right peripheral channel speaker is disposed adjacent to the right 60 degrees from the reference point,
And the right rear channel speaker is disposed adjacent the right 150 degrees from the reference point. The method of claim 8,
And a woofer speaker set comprising at least one subwoofer speaker. 12. The set of claim 11, wherein said woofer speaker set
And a left channel woofer speaker and a right channel woofer speaker respectively disposed between the left and right 30 to 90 degrees at the reference point. The method of claim 8, wherein the horizontal speaker set
And a left peripheral channel speaker and a right peripheral channel speaker disposed between the left and right 100 to 120 degrees at the reference point, respectively. An audio signal generation unit configured to receive a predetermined audio signal and generate at least one downmixing signal by downmixing the predetermined audio signal according to the number of speakers included in a speaker unit; And
A speaker unit including at least one speaker for respectively outputting the at least one down mixing signal,
The predetermined audio signal is
A center channel audio signal corresponding to a center channel speaker disposed at a reference point that is 0 degrees forward of the horizontal plane, a left channel audio signal and a right channel audio signal corresponding to left and right channel speakers respectively disposed at left and right 30 degrees from the reference point, respectively At least one first channel audio signal and at least one second channel audio signal corresponding to at least one first channel speaker and at least one second channel speaker respectively disposed between left and right 60 to 150 degrees from the reference point. A left vertical channel audio signal and a right vertical channel audio signal corresponding to a left vertical channel speaker and a right vertical channel speaker respectively disposed between the left and right 30 to 45 degrees from the reference point and between 30 and 45 degrees in the vertical direction from the reference point, respectively. And between 90 and 150 degrees in the vertical direction from the reference point. And a center vertical channel audio signal corresponding to the center vertical channel speaker. The method of claim 14, wherein the speaker unit
And a speaker capable of outputting an audio signal of any one of 7.1, 5.1, and 2.0 channels. Corresponding to the center channel speaker disposed at the reference point which is 0 degrees forward of the horizontal plane, the center channel audio signal, the left channel audio signal and the right channel audio signal corresponding to the left channel speaker and the right channel speaker respectively disposed at the left and right 30 degrees from the reference point, respectively, At least one first channel audio signal and at least one second channel audio signal corresponding to at least one first channel speaker and at least one second channel speaker respectively disposed between the left and right 60 to 150 degrees from the reference point; A left vertical channel audio signal and a right vertical channel audio signal corresponding to a left vertical channel speaker and a right vertical channel speaker respectively disposed between the left and right 30 to 45 degrees from the reference point and between 30 and 45 degrees in the vertical direction from the reference point, And between 90 and 150 degrees in the vertical direction from the reference point. Comprising: receiving the input audio signal including a central vertical channel audio signal corresponding to a vertical central channel speakers; And
Downmixing the input audio signals into a 7.1, 5.1, or 2.0 channel audio signal to produce a downmix signal;
Generating the down mixing signal
Generating the downmixing signal corresponding to one channel based on at least one predetermined channel audio signal corresponding to the at least one speaker positioned on the same or adjacent vertical line. Way. The method of claim 16, wherein the step of receiving an input audio signal
The first channel including the center channel audio signal C, the left channel audio signal L and the right channel audio signal R, a left peripheral channel audio signal LS, and a left rear channel audio signal LB. The second channel audio signal including the channel audio signal and the right peripheral channel audio signal RS and the right rear channel audio signal RB, the left vertical channel audio signal LH and the right vertical channel audio signal RH, center A vertical channel audio signal CH and a left woofer channel audio signal LFEL and a right woofer channel audio signal respectively corresponding to the left channel woofer speaker and the right channel woofer speaker respectively disposed between left and right 30 to 90 degrees from the reference point ( And receiving a 10.2 channel audio signal including a LFER). The method of claim 17,
Generating the down mixing signal
Downmixing the input 10.2 channel audio signal to 7.1 channel;
The left vertical channel audio signal LH and the right vertical channel audio signal RH respectively correspond to the left vertical channel speaker and the right vertical channel speaker, which are speakers adjacent to 150 degrees in the vertical direction from the reference point.
Generating the down mixing signal

The down mixing equation is performed using a down mixing equation of, wherein the left term represents the down mixing signal and the right term represents a predetermined channel audio signal included in the 10.2 channel audio signal. Way. The method of claim 17,
Generating the down mixing signal
Downmixing the input 10.2 channel audio signal to 7.1 channel;
The left vertical channel audio signal LH and the right vertical channel audio signal RH respectively correspond to the left vertical channel speaker and the right vertical channel speaker that are adjacent to 90 degrees in the vertical direction from the reference point.
Generating the down mixing signal

The down mixing equation is performed using a down mixing equation of, wherein the left term represents the down mixing signal and the right term represents a predetermined channel audio signal included in the 10.2 channel audio signal. Way. The method of claim 17,
Generating the down mixing signal
Downmixing the input 10.2 channel audio signal into a 5.1 channel;
Generating the down mixing signal

The down mixing equation is performed using a down mixing equation of, wherein the left term represents the down mixing signal and the right term represents a predetermined channel audio signal included in the 10.2 channel audio signal. Way. The method of claim 17,
Generating the down mixing signal
Downmixing the input 10.2 channel audio signal to 2.0 channels;
Generating the down mixing signal

The down mixing equation is performed using a down mixing equation of, wherein the left term represents the down mixing signal and the right term represents a predetermined channel audio signal included in the 10.2 channel audio signal. Way. The method of claim 16, wherein the step of receiving an input audio signal
The first channel audio signal and the right peripheral channel audio signal including the center channel audio signal C, the left channel audio signal L, the right channel audio signal R, and the left peripheral channel audio signal LS. Between the second channel audio signal, the left vertical channel audio signal LH and the right vertical channel audio signal RH, the center vertical channel audio signal CH, and the left and right 30 to 90 degrees from the reference point; And receiving an 8.2 channel audio signal including a left woofer channel audio signal LFEL and a right woofer channel audio signal LFER respectively corresponding to the left channel woofer speaker and the right channel woofer speaker respectively disposed in the. Down mixing method of audio signals. The method of claim 22,
Generating the down mixing signal
Downmixing the input 8.2 channel audio signal to a 5.1 channel;
Generating the down mixing signal

The down mixing equation is performed using a down mixing equation of, wherein the left term represents the down mixing signal and the right term represents a predetermined channel audio signal included in the 8.2 channel audio signal. Way. Generating the down mixing signal
Downmixing the input 8.2 channel audio signal to 2.0 channels;
Generating the down mixing signal

The down mixing equation is performed using a down mixing equation of, wherein the left term represents the down mixing signal and the right term represents a predetermined channel audio signal included in the 8.2 channel audio signal. Way.

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