KR101636801B1 - The Apparatus and Method for focusing the sound using the array speaker - Google Patents
The Apparatus and Method for focusing the sound using the array speaker Download PDFInfo
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- KR101636801B1 KR101636801B1 KR1020100004054A KR20100004054A KR101636801B1 KR 101636801 B1 KR101636801 B1 KR 101636801B1 KR 1020100004054 A KR1020100004054 A KR 1020100004054A KR 20100004054 A KR20100004054 A KR 20100004054A KR 101636801 B1 KR101636801 B1 KR 101636801B1
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Abstract
A harmonic signal is generated by reflecting focusing information (reproducible frequency band, focusing performance, etc.) when generating a harmonic signal with respect to a low-frequency signal of an original sound, and a low-frequency signal is added to a harmonic signal by taking an appropriate gain. And differentiated performance that can simultaneously enhance the sound quality of the extended bass.
Description
The present invention relates to an acoustic device for forming an acoustic region in a specific region using an array device, and more particularly to an acoustic device including a plurality of speakers for converting a low-frequency band signal having a limited reproduction capability into a used frequency band according to a method of forming an array And an audio signal generator.
A method of forming a personal sound zone in which sound can be transmitted only to a specific listener without earphone or headset without causing noise pollution and a time delay or a specific filter is added to an input signal of an array speaker composed of a plurality of speakers There is used a method of concentrating sound in a specific direction and a specific position by generating a sound beam to be output.
However, since the size of the acoustic region that can be generated by the array speaker increases in inverse proportion to the frequency, it is difficult to effectively implement the acoustic region in the low frequency band. In the room where the reflection occurs from the wall, There is a limit to the formation.
In order to overcome these limitations, it has been proposed to use a psychoacoustic bandwidth extension for high-frequency harmonics, which has a pitch-similarity characteristic similar to that of a low-frequency band and has a relatively good acoustic- The sound of the voice is replaced by the sound of the sound.
However, such a technique does not reflect the physical phenomenon involved in the focusing of the array speaker, which limits the performance of the array speaker.
It is possible to provide a focusing device capable of reflecting the performance characteristics of the array speaker in generating a harmonic signal with respect to acoustic in a low frequency range so as to be advantageous in focusing on a specific area.
The sound pressure distribution is varied according to each frequency band when the array speaker performs acoustical focusing through the focusing process. In the range where the sound pressure distribution is not impaired, some frequency components are synthesized in the output signal in a low- It is possible to maintain the tone and improve the bass output performance.
According to an aspect of the present invention, there is provided a sound source focusing apparatus for focusing a sound source using an array speaker, the apparatus comprising: a focusing information extracting unit for extracting focusing information on a sound source radiation characteristic of the array speaker; And a harmonic signal generator for generating a harmonic signal by performing psychoacoustic processing on a low frequency acoustic signal of a frequency equal to or lower than the frequency of the harmonic signal and adjusting the generation order of the harmonic signal and the intensity of the harmonic signal using the focusing information.
The focusing information extracting unit may extract focusing information including a control coefficient for focusing the array speaker, information on the sound pressure distribution of the acoustic space formed by the array speaker, and performance parameters of the array speaker.
The harmonic signal generator includes a signal generator for generating a harmonic signal having a higher harmonic component with respect to the low frequency acoustic signal, a signal controller for adjusting the generation order and the attenuation ratio of the harmonic signal generated in the signal generator using the focusing information, And a signal intensity adjusting unit for adjusting the intensity of the harmonic signal so that the size of the sound source output from the array speaker is kept constant.
The apparatus may further include a low frequency component adding unit for generating a low frequency component sound signal by adding a gain for each frequency band of the low frequency sound signal.
The low frequency component adding unit includes a band separating unit for dividing the sound signal of the sound source into a plurality of frequency bands, a gain adding unit for adding a gain required for maintaining the tone of the low frequency acoustic signal to the acoustic signal divided into frequency bands, And a band combining unit for combining the acoustic signals to which the gain is added for each band.
The apparatus may further include a signal combining unit for combining the harmonic signal generated by the harmonic signal generating unit and the low frequency component acoustic signal generated by the low frequency component adding unit to generate an output signal output from the array speaker.
According to an aspect of the present invention, there is provided a method of focusing a sound source using an array speaker, the method comprising: extracting focusing information on a sound source radiation characteristic of the array speaker; And generating the harmonic signal by using the focusing information to adjust the generation order and the attenuation ratio of the harmonic signal or the intensity of the harmonic signal using the focusing information.
The method may further include generating a low frequency component acoustic signal by adding a gain to each frequency band of the low frequency acoustic signal and generating an output signal output from the array speaker by combining the generated harmonic signal and the generated low frequency component acoustic signal can do.
The low frequency band, which is difficult to control in the focusing process, is converted into the used frequency band having high focusing performance by using the psychoacoustic effect and reproduced, thereby improving the overall focusing performance.
The focusing performance of the array speaker can be enhanced by generating an output signal reflecting the performance characteristics of the array speaker itself during the focusing process of the array speaker.
By adding the bass component of the original sound to the signal obtained by converting the low-frequency band signal to the used frequency band signal by using the psychoacoustic effect, it is possible to easily maintain the tone of the original sound during listening and improve the sound quality of the synthesized final audio signal have.
1 is a graph showing radiation characteristics of a general speaker and an array speaker according to frequencies.
2 is a block diagram illustrating a sound source focusing apparatus according to an embodiment of the present invention.
3 is a block diagram illustrating a specific configuration of the
4 is a view illustrating the principle of a psychoacoustic effect used in a sound source focusing apparatus according to an embodiment of the present invention.
5 is a block diagram showing a specific configuration of a low frequency
6 is a graph showing an acoustic signal to which a gain is added through the
FIG. 7 is a flowchart illustrating a method of focusing a original sound according to an embodiment of the present invention.
FIG. 8 is a diagram showing a signal generated at each step of the original sound focusing method of FIG. 7 and a final output signal.
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 is a graph showing radiation characteristics of a general speaker and an array speaker according to frequencies.
Referring to FIG. 1, in the case of a general speaker, a typical speaker shows a radiation characteristic when it is located at the left center of the graph, and in the case of an array speaker, an array speaker shows a radiation characteristic when the speaker is positioned on the left side of the graph.
As shown in FIG. 1, the general speaker is widely spread in all the spaces without the sound being concentrated in a specific area. Also, there is no particular difference in frequency, and radiation characteristics are similar to each other.
On the contrary, in the case of the array speaker, the sound is concentrated to the center of the right side, and as the frequency is higher, the sound tends to concentrate more and the concentrated region becomes smaller. In other words, it can be seen that the array speaker is separated from a bright zone having a high sound pressure and a dark zone having a low sound pressure.
Also, in the case of the array speaker, it can be seen that the higher the frequency is, the more concentrated the bright zone is in the narrow region.
The
2 is a block diagram illustrating a sound source focusing apparatus according to an embodiment of the present invention.
2, the sound source focusing apparatus may include a focusing
The focusing
The focusing information may include control coefficients for focusing the array speaker, information on the sound pressure distribution of the acoustic space formed by the array speaker, and performance parameters of the array speaker.
The information on the sound pressure distribution can be calculated from numerical analysis through virtual simulation for the array speaker or from a value obtained by measuring a microphone in a sound space formed by the array speaker and measuring it in an acoustic space.
The performance parameters of the array speaker may include a low frequency limit frequency according to the array aperture of the array speaker, a high frequency limit frequency due to the interval between each speaker in the array speaker, and a gain adjustment value for each speaker in the array speaker.
The harmonic
In addition, the generation order and the attenuation ratio of the harmonic signal generated by using the focusing information are set, and the loudness of the original sound is calculated. The loudness of the harmonic signal is maintained so that the psychoacoustic- .
3 is a block diagram illustrating a specific configuration of the
Referring to FIG. 3, the
The
Psychoacoustic effect refers to the phenomenon of recognizing bass using harmonics, which is also called virtual pitch or missing fundamental effect.
4 is a view illustrating the principle of a psychoacoustic effect used in a sound source focusing apparatus according to an embodiment of the present invention.
4, the sound having the harmonic tone is the fundamental frequency ω 0 (400) composed of only (2ω 0, 3ω 0, 4ω 0, 5ω 0, 401) with respect to sound having a fundamental frequency ω 0 (400) and And has a similar low pitch. This phenomenon is called a psychoacoustic bandwidth extension.
By using this phenomenon, it is possible to provide a low-pitched auditory sense without actually generating a low sound. By applying such a psychoacoustic effect, it is possible to replace a sound of a low frequency, which is difficult to form a sound zone by distributing a sound beam spatially widely, with harmonics, and by using only a high frequency having a relatively small acoustic beam width, a sound zone can be formed. Therefore, it becomes possible to form a sound zone of a smaller size.
Next, the
Generally, in order to generate harmonics, a non-linear device such as a rectifier, an integrator, or a multiplier is used to process the original signal to generate higher order harmonic components. . In addition, the harmonics generated in this manner can be divided and output according to the frequency band in accordance with the purpose.
Therefore, since each harmonic component generated by the nonlinear element is generated by the nonlinear element, it may cause degradation in performance or distortion. Therefore, a certain degree of restriction and attenuation is required in consideration of this. The
The signal intensity adjuster 320 adjusts the intensity of the harmonic signal so that the size of the sound source output from the array speaker is kept constant.
Harmonic (2ω 0, 3ω 0, 4ω 0, 5ω 0, 401) the signal with higher increasing the frequency to a low frequency grows more and the intensity (loudness) of the signal lead to the fundamental frequency (ω 0) in the frequency Significance of 4 Since the intensity of the fundamental frequency (? 0 ) signal is also derived by the ratio of the intensity of the signal that gradually increases as the frequency increases, the
The low frequency
5 is a block diagram showing a specific configuration of a low frequency
5, the low frequency
The
It may be performed on a low frequency acoustic signal of a frequency lower than a predetermined frequency among sound signals of a sound source to be output through the array speaker.
The
Since the
The
The gain added to each frequency band is calculated by selecting a frequency band and a size that can be added to the output signal in consideration of the distribution of the acoustic beam pattern in the high sound pressure range and the low sound pressure range according to the sound pressure distribution of the array speaker.
6 is a graph showing an acoustic signal to which a gain is added through the
Referring to FIG. 6, a low frequency sound signal of less than 2 kHz is separated by n frequencies, a gain g 1 (n) is added to the output signal in order to derive the original sound in consideration of the distribution of the acoustic beam pattern, , g 2 , g 3 , ..., g n ).
The
The focusing
The focusing
FIG. 7 is a flowchart illustrating an original sound focusing method according to an embodiment of the present invention, and FIG. 8 is a diagram illustrating signals and final output signals generated in each step of the original sound focusing method of FIG.
Referring to FIG. 8, 8 (a) represents a sound signal of an original sound, 8 (b) represents a harmonic signal for a low frequency acoustic signal among acoustic signals of an original sound, and 8 (c) represents a final output signal.
Hereinafter, an original sound focusing method will be described with reference to FIGS. 7 and 8. FIG.
The focusing information on the sound source radiation characteristic of the array speaker is extracted (700). The focusing information may include control coefficients for focusing the array speaker, information on the sound pressure distribution of the acoustic space formed by the array speaker, and performance parameters of the array speaker.
8A, when the original sound having the
The
The final
The gain is added to the
The low frequency
The array speaker reproduces sound from the generated output signal. The
Meanwhile, the embodiments of the present invention can be embodied as computer readable codes on a computer readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored.
Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device and the like, and also a carrier wave (for example, transmission via the Internet) . In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the present invention can be easily deduced by programmers skilled in the art to which the present invention belongs.
The present invention has been described in detail by way of examples. The foregoing embodiments are intended to illustrate the present invention and the scope of the present invention is not limited to the specific embodiments.
100 focusing information extracting unit
110 harmonic signal generator
120 low frequency component adding unit
130 signal synthesis unit
140 focusing processing unit
150 multi-channel amplifier
160 array speaker
300 signal generating unit
310 signal control unit
320 Signal strength adjuster
500 band separator
510 gain addition unit
520 band coupling unit
Claims (13)
A focusing information extracting unit for extracting focusing information on a sound source radiation characteristic of the array speaker;
A harmonic signal generator for generating a harmonic signal for a low frequency acoustic signal of a predetermined frequency or lower among the acoustic signals of the sound source using the focusing information; And
A low frequency component adding unit for generating a low frequency component sound signal by adding a gain to each frequency band of the low frequency sound signal; Wherein the sound source focusing device comprises:
Wherein the array speaker comprises a plurality of array speakers, a control coefficient for focusing the array speaker, information on a sound pressure distribution of the acoustic space formed by the array speaker, and focusing parameters including performance parameters of the array speaker.
A sound source focusing device for extracting information about a sound pressure distribution derived through numerical analysis through virtual simulation or actual measurement in the acoustic space.
And a performance parameter including a low frequency limit frequency, a high frequency limit frequency of the array speaker, and a gain adjustment value for each array speaker.
A signal generator for generating a harmonic signal having a high-order harmonic component with respect to the low-frequency acoustic signal;
A signal controller for adjusting a generation order and an attenuation ratio of the harmonic signal generated by the signal generator using the focusing information; And
And a signal intensity controller for adjusting the intensity of the harmonic signal so that the size of the sound source output from the array speaker is kept constant.
A band separator for dividing the sound signal of the sound source into a plurality of frequency bands;
A gain adding unit for adding a gain required for maintaining a tone color of the low frequency acoustic signal to the acoustic signal divided into the frequency band by the frequency band; And
And a band combining unit for combining the acoustic signals to which the gain is added for each of the frequency bands.
And a signal combiner for combining the harmonic signal generated by the harmonic signal generator and the low frequency component acoustic signal generated by the low frequency component adding unit to generate an output signal output from the array speaker.
Extracting focusing information on a sound source radiation characteristic of the array speaker;
Generating a harmonic signal for a low frequency acoustic signal of a predetermined frequency or lower among the acoustic signals of the sound source using the focusing information; And
Generating a low frequency component acoustic signal by adding a gain for each frequency band of the low frequency acoustic signal; / RTI >
Generating a harmonic signal having a high-order harmonic component with respect to the low-frequency acoustic signal;
Adjusting a generation order and an attenuation ratio of the generated harmonic signal using the focusing information; And
And adjusting the intensity of the harmonic signal so that the size of the sound source output from the array speaker is kept constant.
Dividing the sound signal of the sound source into a plurality of frequency bands;
Adding a gain required for maintaining a tone color of the low frequency acoustic signal to the acoustic signal divided into the frequency band for each frequency band; And
And combining the sound signals to which the gain is added for each of the frequency bands.
And generating an output signal from the array speaker by combining the generated harmonic signal and the generated low frequency component acoustic signal.
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| KR1020100004054A KR101636801B1 (en) | 2010-01-15 | 2010-01-15 | The Apparatus and Method for focusing the sound using the array speaker |
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| KR1020100004054A KR101636801B1 (en) | 2010-01-15 | 2010-01-15 | The Apparatus and Method for focusing the sound using the array speaker |
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| KR100829567B1 (en) * | 2006-10-17 | 2008-05-14 | 삼성전자주식회사 | Method and apparatus for bass enhancement using auditory property |
| KR101520618B1 (en) * | 2007-12-04 | 2015-05-15 | 삼성전자주식회사 | Method and apparatus for focusing the sound through the array speaker |
| KR101524463B1 (en) * | 2007-12-04 | 2015-06-01 | 삼성전자주식회사 | Method and apparatus for focusing the sound through the array speaker |
| KR101445075B1 (en) * | 2007-12-18 | 2014-09-29 | 삼성전자주식회사 | Method and apparatus for controlling sound field through array speaker |
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