KR101035070B1 - Apparatus and method for producing high quality virtual sound - Google Patents

Abstract

The present invention relates to an apparatus and a method for generating a virtual space sound. The apparatus for generating a virtual space sound according to the present invention includes an input signal distribution unit for expanding and distributing an input 2-channel signal and outputting a plurality of distribution channel signals. A tone characteristic adjusting unit for adjusting a tone characteristic according to a spatial environment through a multistage filter with respect to a first distribution channel signal among the plurality of distribution channel signals output from the signal distribution unit, and outputting the tone characteristic signal as a tone characteristic signal; A mutual comparison processing unit which compares the tone characteristic signal output from the unit and a second distribution channel signal among the plurality of distribution channel signals output from the input signal distribution unit to output a tone characteristic comparison signal, and the mutual comparison processing unit Harmonic processing by controlling time and frequency characteristics of the timbre characteristic comparison signal output from And a harmonic implementation unit for outputting a harmonic tone signal, and a combination of the harmonic tone signal output from the harmonic implementation unit and the second distribution channel signal output from the input signal distribution unit to output a synthesized characteristic signal. By including a processor, not only the positional correction of the sound source but also a harmonic of a specific tone can be imposed while minimizing the loss of the original sound, thereby increasing the density due to the overlapping sounds in the case of a specific tone.

Description

Apparatus and method for generating high quality virtual space sound {APPARATUS AND METHOD FOR PRODUCING HIGH QUALITY VIRTUAL SOUND}

The present invention relates to an apparatus and method for generating high quality virtual spatial sound, and more particularly, to an apparatus and method for generating high quality virtual spatial sound by correcting various sound source positions in accordance with stereo sound.

In general, two-channel multidimensional sound generation is basically required for desired multidimensional sound from a left signal (hereinafter referred to as "L") and a right signal (hereinafter referred to as "R") that constitute a two-channel stereo audio signal. After the components are obtained, this is done by synthesizing these components.

One embodiment of the prior art of such multidimensional sound processing is embodied in US Pat. No. 5,440,638 “STEREO ENHANCEMENT SYSTEM” issued August 8, 1995, invented by Danny D. Lowe et al.

The present invention obtains the L component, the R component, the L + R component, and the LR component of the original signal with the input L signal and the R signal, and then the L component, the R component, the L + R component, the LR component, and the band-limited LR component. We synthesized the spatial sound. If spatial sound is realized through this synthesis, spatial sound is possible, but the distribution of the center of sound source and effect sound is disturbed. That is, the original stereo signal is a signal recorded by well-distributing the position of the sound source and the position of the effect sound. Therefore, after separating into the L + R component and the L-R component and synthesized in the L component and the R component again, many problems occur.

For example, when the R-L component is obtained from the L signal and the R signal, and synthesized into the L component and the R component of the original signal, the R-L + L component and the R-L + R component are obtained. As a result, the R side becomes 2R-L and the L side becomes R-2L. In this case, the stereo signal feels a change in space, but the stereo sound space is unbalanced. If there is only a mono-component signal, L = R, and when L => R, the R side is the R signal and the L side is the -R signal, and the center of the sound source is disturbed due to the 180 degree difference between the channels. Therefore, this method realizes the spatial effect of stereo, but it can be seen that the separation and stereotactic sense of sound are considerably degraded.

As an example different from the above example, when synthesizing a signal in which each band is limited to the L component and the R component, that is, L => a (L + L (LPF) -R (HPF)), R => a (R + R (LPF) -L (HPF)) (where LPF is a lowpass filter, HPF is a highpass filter, a is a weight), and in the mono signal, only the lowpass is boosted, In the case of the stereo signal, the center of the sound source is improved by changing only the high frequency component of the relative channel, but there is a limitation of the spatial effect. In addition, the above method could not satisfy the needs of the listeners because of the limitation of expressing only a simple acoustic space.

In order to realize high quality virtual space acoustics, the main task is to maintain the center sound source and maintain the distribution of sound sources, and in order to obtain effects according to various spatial settings, sound source positions must be corrected. In order to implement such correction, analog signal processing in addition to digital signal processing complicates the system configuration, and many components are required, and there is a limit in audio performance required for high quality signal processing.

In addition, in the case of Dolby's pursuit of the panorama effect around the object's movement, the realism is good when the multi-channel is implemented, but when the stereo signal is implemented, the sound image falls to one channel. So it's good for watching movies, but it's hard to use this feature when listening to stereo music. On the other hand, in the case of SRS, which pursues an atmosphere-centered effect, bass reinforcement is added to the bass reinforcement with a simple EQ in order to have a lot of spatial effect parts. This is also a limitation in high quality implementations. The system which satisfies each of these problems and satisfies both the atmosphere and the movement of the space is released as some expensive system, but the implementation of the system that satisfies the change of the position of the space has not been announced yet.

As described above, in the case of the conventional spatial acoustics, the spatial acoustic effects, the simple spatial effects, and the like are centered on the movement and the atmosphere. Efforts have been made to implement these parts collectively, but there is still a lot. Especially in the market where 2.1 channel or 3.1 channel is required, in the process of pursuing large image and slimming, for example, as the TV market is evolving into PDP TV, LCD TV and LED TV, the voice processing part in the TV is increasingly implemented in structure. It's getting harder. In particular, LED TVs, which have been accelerated to slim down, have a system structure that has limitations in the position and layout of the speaker due to the thin width of the LED TVs. This may not be the case. This is called a lip sync. Generally, it is only known as a part of time difference information transmission between video and audio transmission (temporal lip sync), but there is also a part about the position between the image position and the audio of the video (position lip sync). In particular, the position lip-sync part has been neglected until now. In the past, the positional lip sync was attempted to be overcome by the volume of the sound, but as described above, it is difficult to implement due to slimming.

In order to solve the above problems, an object of the present invention is to provide a high-quality virtual space sound generating apparatus and method for correcting the position of the sound source to increase the listening volume.

In addition, another object of the present invention is to provide an apparatus and method for producing a high-quality virtual space sound, which increases the volume of the sound by listening to the density of the sound rather than the sound.

In addition, another object of the present invention is to provide a high quality virtual space sound generating apparatus and method capable of realizing the virtual space sound by automatically changing the mode by the position correction of the various sound sources according to the input signal.

In order to achieve the above object, an apparatus for generating a virtual space sound according to the present invention includes an input signal distribution unit for expanding and distributing an input 2-channel signal to output a plurality of distribution channel signals, and an output signal from the input signal distribution unit. A tone feature adjusting unit for adjusting a tone characteristic according to a spatial environment through a multi-stage filter with respect to a first distribution channel signal among the plurality of distribution channel signals, and outputting the tone characteristic signal as the tone characteristic signal; A mutual comparison processing unit for comparing a characteristic signal and a second distribution channel signal among the plurality of distribution channel signals output from the input signal distribution unit to output a tone characteristic comparison signal, and the tone characteristic output from the mutual comparison processing unit Implement harmonic processing through control of time and frequency characteristics for the comparison signal And a mixing processor for synthesizing the harmonic tone signal output from the harmonic implementation unit and the second distribution channel signal output from the input signal distribution unit to output a synthesized characteristic signal.

The virtual spatial sound generating device generates a frequency response characteristic that affects the direction of space by passing a third distribution channel signal among the plurality of distribution channel signals output from the input signal distribution unit through a plurality of filters formed in parallel. A spatial control unit for outputting a front L / R signal obtained by cross-connecting a control unit and the synthesized characteristic signal output from the mixing processor and the frequency response characteristic signal output from the spatial characteristic controller according to HRTF principle It is preferable to further contain a part.

The spatial controller may further output a front center signal passing through a band pass filter by combining the left signal and the write signal of the synthesis characteristic signal output from the mixing processor.

The input signal distribution unit outputs a distribution base signal bypassing the base signal, and the virtual spatial sound generator generates the distribution base signal output from the input signal distribution unit and the harmonic tone signal output from the harmonic implementation unit. It is preferable to further include a base signal synthesizer for synthesizing and outputting a base channel signal passed through the low pass filter.

The apparatus for generating a virtual spatial sound may further include a channel mapping unit configured to output a 2-channel signal and the base signal by mapping a 2-channel stereo signal or a multi-channel signal.

The apparatus for generating a virtual spatial sound preferably further includes a signal analyzer for automatically analyzing whether the signal is a mono signal or a stereo signal using the second distribution channel signal output from the input signal distributor for mode switching.

In addition, the virtual spatial sound generation method according to the present invention comprises the steps of expanding and distributing the input two-channel signal to output a plurality of distribution channel signals, and a plurality of stages with respect to the first distribution channel signal of the plurality of distribution channel signals Adjusting a tone characteristic according to a spatial environment through a filter and outputting the tone characteristic signal; and comparing the tone characteristic signal with a second distribution channel signal among the plurality of distribution channel signals to output a tone characteristic comparison signal. And outputting a harmonic tone signal by implementing a harmonic processing through control of time and frequency characteristics with respect to the tone quality comparison signal, and synthesizing the harmonic tone signal and the second distribution channel signal. By providing the step of outputting to achieve the above object.

According to the above-described configuration, the present invention can increase the listening volume by correcting the position of the sound source, and can increase the listening volume by increasing the density of the sound rather than the loudness.

In addition, the present invention can automatically implement the mode switching to implement the virtual space sound by the position correction of the various sound sources according to the input signal can prevent the inconvenience of the listener to manually select the position correction effect of the various sound sources.

Hereinafter, an apparatus and method for generating high quality virtual space acoustic sound according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram of an apparatus for generating a high quality virtual space sound according to an embodiment of the present invention, FIG. 2 is a diagram illustrating a detailed configuration of a tone characteristic control unit shown in FIG. 1, and FIG. FIG. 4 is a diagram illustrating a specific configuration of the harmonic implementation unit, and FIG. 4 is a diagram illustrating a detailed configuration of the spatial characteristic adjusting unit illustrated in FIG. 1, and FIG. 5 is a diagram of a detailed configuration of the spatial adjusting unit illustrated in FIG. 1. 6 is a diagram illustrating a specific configuration of the base signal synthesis unit illustrated in FIG. 1, and FIG. 7 is a diagram illustrating a specific configuration of the signal analysis unit illustrated in FIG. 1.

As shown in FIG. 1, the apparatus for generating a high quality virtual spatial sound includes a channel mapping unit 1, an input signal distribution unit 2, a tone characteristic control unit 3, a mutual comparison processing unit 4, and a harmonic implementation unit 5. ), A mixing processing unit 6, a spatial characteristic adjusting unit 7, a spatial adjusting unit 8, a base signal synthesizing unit 9, a signal analyzing unit 10, and a central processing unit 11. Among these configurations, in order to increase the density of sound, an input signal distribution unit 2, a tone characteristic control unit 3, a mutual comparison processing unit 4, a harmonic implementation unit 5, and a mixing processing unit 6 are used. In order to correct the position of various sound sources, in addition to the above-described configurations for increasing the density of sound, the spatial characteristic adjusting unit 7 and the spatial adjusting unit 8 are used.

The channel mapping unit 1 outputs a mapping signal for the input signal. The channel mapping unit 1 outputs a 2-channel signal and a base signal by mapping a 2-channel stereo signal or a multi-channel signal which is an input signal.

When the multi-channel signals Fin, Sin, Rin, Cin, and Bin are input as the input signal, the two-channel signal F (L / R) = a * Fin (L / R) + b * Sin (L / R) + b * Map with Rin (L / R) + b * Cin and map with base signal B = a * Bin. Here, Sin (L / R) and Rin (L / R) have a 180 degree retardation with Fin (L / R). In this case, the base signal B is a subwoofer signal. If there is no bin, the base signal B = a * LPF (Fin (L / R) + Sin (L / R) + Rin (L / R) + Cin) is obtained. On the other hand, when the two-channel stereo signal Fin is input as the input signal, the two-channel signal F (L / R) = a * Fin (L / R) is mapped, and the base signal B = a * LPF (Fin (L / R). Is mapped to)). In this case, the bass signal B is made into bass. Where constants a and b are weights and LPF is a lowpass filter.

The input signal distribution unit 2 performs expansion and distribution processing again on the two channel signals F (L / R) and the base signal B output from the channel mapping unit 1 for respective characteristic processing. Therefore, the two-channel signal F is divided into the first distribution channel signal F1, the second distribution channel signal F2, and the third distribution channel signal F3, and the base signal B is bypassed to output the base signal B '. As shown in Fig. 1, the original sound characteristics are maintained in the front L / R signal FS (L / R), which is the final output signal, due to the second distribution channel signal F2 output from the input signal distribution section 2. Loss can be minimized.

The timber characteristic adjusting section 3 controls only the desired specific signal according to the spatial environment to the first distribution channel signal F1 output from the input signal distribution section 2 in order to adjust the timbre characteristic according to the spatial environment. The timber characteristic controller 3 performs gain and frequency characteristic processing on the input first distribution channel signal, and outputs a multi-stage timber characteristic signal F_s. That is, as shown in Fig. 2, the timbre characteristic adjusting section 3 has a serial processing structure and outputs a timbre characteristic signal F_s = F1 (g1 * filter1 + g2 * filter2 + .... + gN * filterN).

Here, g1 to gN are +/- gains, and filter1 to filterN are parts for processing various kinds of signals, such as a band pass circuit, a band stop circuit, a low pass stop circuit and a high pass stop circuit.

The mutual comparison processing section 4 compares the tone feature signal F_s output from the tone feature adjusting unit 3 and the second distribution channel signal F2 output from the input signal distribution unit 2 and outputs the tone feature comparison signal F_c. do. That is, the tone color characteristic comparison signals F_c = n * F_s-m * F2 output from the mutual comparison processing section 4. Where n and m are weights. Therefore, when n = m, the voice characteristic comparison signal F_c is obtained only the voice characteristic control signal, and when n! = M, an interference signal is synthesized in addition to the voice characteristic control signal between the voice characteristic signal F_s and the second distribution channel signal F2 which are mutual signal sources. This is the case. The mutual comparison processing section 4 can not only expand the position of the sound source up and down, but also set n and m equally or slightly set the difference between n and m. The signal to increase the density of the sound can be obtained.

The harmonic implementation 5 receives the tone characteristic comparison signal F_c of the mutual comparison processing unit 4 to increase the density of a specific tone by emphasizing the tone characteristic of a specific portion and receives the harmonic signal through control on time and frequency characteristics. Implement the harmonic tone signal F_h.

As shown in FIG. 3, the harmonic tone signal F_h = F_c (1 + g4 * Z ^ (− k1) + g5 + LPF ((g1 * Z ^ (k2 / 2))) output from the harmonic implementation unit 5 + g2 * Z ^ (k2))-BPF (g3 * Z ^ (k2)), where g1, g2, g3 and g4 are weighted gains, -1 <g1, g2, g3, g4, <1 In addition, k1 and k2 are also weights, which means time-depth widths, so that the harmonic implementation 5 may increase the density of sound during listening due to the harmonic processing of a particular voice portion due to the parallax of the signal. Can be.

The mixing processor 6 synthesizes the harmonic tone signal F_h output from the harmonic implementation unit 6 and the second distribution channel signal F2 output from the input signal distribution unit 2 and outputs a synthesis characteristic signal F_mix. The composite characteristic signal F_mix = n * F_h + m * F2 output from the mixing processor 6. Where n and m have the condition 0 <(n, m) <1. This composite characteristic signal F_mix has the effect of raising the density and elasticity coefficient of sound and raising the sound image.

The reason why the mixing processing section 6 performs this synthesis processing is that in the case of the harmonic timbre signal F_h, the phase characteristic is changed for all signals due to the timbre characteristic comparison signal processing, which can cause an overall phase characteristic instability. In order to prevent this phase characteristic anxiety, only the characteristic emphasis portion according to the tone environment is harmonic-processed, and the harmonic-tone harmonic tone signal F_h synthesized to the second distribution channel signal F2 output from the input signal distribution unit 2 is synthesized. Therefore, the harmonics are emphasized by the mixing processor 6 while the characteristics of the original signal can be maintained.

The spatial characteristic adjusting unit 7 obtains the frequency response characteristic signal F_a which affects the direction of space. That is, the spatial characteristic adjusting unit 7 obtains the frequency characteristic which is a spatial direction element by using a plurality of filters formed in parallel with respect to the third distribution channel signal F3 output from the input signal distribution unit 2, and then obtains the frequency response characteristic signal F_a. Outputs

As shown in FIG. 4, the spatial characteristic adjusting unit 7 has a parallel processing structure, and is a frequency response characteristic signal F_a = F3 (g1 * filter1 + g2 * filter2 + .... + gN * filterN). Here, g1 to gN are +/- gains, and filter1 to filterN are parts for processing various kinds of signals, such as a band pass circuit, a band stop circuit, a low pass stop circuit, and a high pass stop circuit. As described above, the spatial characteristic adjusting unit 7 in which a plurality of filters are connected in parallel has an advantage of not being affected by the frequency characteristics of other filters compared with the case where the plurality of filters are connected in series.

The spatial controller 8 synthesizes the composite characteristic signal F_mix output from the mixing processor 6 and the frequency response characteristic signal F_a output from the spatial characteristic controller 7 to combine the front L / R signal FS (L / R). Output That is, the spatial controller 9 emphasizes the frequency response characteristic signal F_a and the density of the sound according to the spatial characteristic response process while maintaining the original signal by the second distribution channel signal F2 input to the mixing processor 6. By synthesizing between the harmonic tone signals F_h, the position of the sound source can be positioned up once, and the position of the sound source can be adjusted back and forth as well as the width of the space.

As shown in FIG. 5, the spatial controller 8 connects the cross signal between the L / R signal of the composite characteristic signal F_mix and the L / R signal of the frequency response characteristic signal F_a in adjusting the sound image and the sound space. HRTF (Head related transfer function) principle is applied.

That is, if the synthesized characteristic signal F_mix and the frequency response characteristic signal F_a are positive signals in order to realize the effect of sound image coming forward in FIG. 5, the front L / R signals FSL and FSR are generated under the following conditions.

FSL = g1 * F_mixL + g3 * F_aR. g1> 0, g3> -0.2

FSR = g2 * F_mixR + g4 * F_aL. g2> 0, g4> -0.2

In this case, while maintaining the stereo balance under the conditions g1 = g2 and g3 = g4, the mono component space is emphasized from the case where g3 and g4 are larger than -0.2, thereby emphasizing the portion where the sound image comes forward. On the other hand, the larger the value of g3 and g4, the more the mono component space is emphasized, but the adjustment is necessary according to the spatial effect.

In addition, if the synthesized characteristic signal F_mix and the frequency response characteristic signal F_a are positive signals in order to realize the effect of acquiring the width of the space according to the left and right diffusion, the front L / R signals FSL and FSR are generated under the following conditions. do.

FS_L = g1 * F_mixL + g3 * F_aR. g1> 0, g3 <-0.2

FS_R = g2 * F_mixR + g4 * F_aL. g2> 0, g4 <-0.2

In this case, the stereo signal is emphasized when g3 and g4 are less than -0.2 while maintaining stereo balance under the conditions g1 = g2 and g3 = g4, so that the sound image has the same size and the same size as the sound image. It is configured to fit. In addition, the left and right widths become wider according to the values of g3 and g4. Therefore, the effect of the front two channels can be obtained in the signal implementation.

A separate channel is required between the change in the sound phase and the center of the sound to emphasize the mono component. In this case, it is obtained by the front center signal FC = BPF (g5 * F_mix (L) + g6 * F_mix (R)). Here, BPF is a band pass type filter, and g5 and g6 are the inputs of the mixing processing unit 6 signal as weights. That is, the front center signal FC is a signal obtained by combining L and R of the synthesis characteristic signal F_mix and passing through the band pass filter.

The base signal synthesizing unit 9 synthesizes the distributed base signal B 'output from the input signal distribution unit 2 and the harmonic tone signal F_h output from the harmonic implementation unit 5 and passes the low pass filter to pass the base channel signal B'S. Outputs That is, the signal synthesizing unit 8 is a .1 channel signal processing unit for obtaining the characteristics of 2.1 or 3.1 channels. Increase the modulus while increasing the volume with the harmonic signal, not the size of.

As shown in Fig. 6, the base channel signal B'S = LPF (n * B '+ m * F_h) output from the base signal synthesizing section 9 is shown. Where n and m are weight gains and may be n> m or n <m as needed.

The signal analyzing unit 10 automatically analyzes whether the signal is a mono signal or a stereo signal using the second distribution channel signal F2 output from the input signal distribution unit 2 for mode switching, and outputs the signal to the central processing unit 11. That is, the signal analyzing unit 10 receives the second distribution channel signal F2 output from the input signal distribution unit 2, and is mono, stereo, or stereo to obtain a displacement on the frequency spectrum so that the center is automatically switched. Information is provided to the processing unit 11, and the central processing unit 11 includes the tone characteristic adjusting unit 3, the spatial characteristic adjusting unit 7, the harmonic implementing unit 5, the mixing processing unit 6, and the spatial adjusting unit 8; ) And the signal synthesizing section 8 are provided.

As shown in FIG. 7, the spectral signal is analyzed with respect to the analysis signal Signal Out = (g10 * F2 (L) + g20 * F2 (R)) (BPF1 + BPF2 + BPF3) output from the signal analyzer 10. It can be obtained by. Here, BPF is a signal analysis filter that passes only the bandpass, and can be added as needed.

That is, by the signal analysis unit 10, the present invention can automatically realize the shape change of the sound field by automatically detecting the spatial effect and automatically switching modes. For example, TV, news, drama and movie music programs have different effects. In the case of news or drama, there are many mono states, but less stereo states, but the opposite is the case for a movie or music broadcast. In this case, the sound image and the emphasis portion of the sound are different. By switching the mode automatically, the trouble of adjustment is reduced.

8 is a flowchart illustrating a method of generating a high quality virtual space sound according to an embodiment of the present invention.

The channel mapping unit 1 outputs a mapping signal for the input signal (S1). That is, the channel mapping unit 1 outputs a 2-channel signal and a base signal by mapping a 2-channel stereo signal or a multi-channel signal which is an input signal.

The input signal distribution unit 2 performs expansion and distribution processing again on the two channel signals F (L / R) and the base signal B output from the channel mapping unit 1 for respective characteristic processing (S2). That is, the two-channel signal F input to the input signal distribution unit 2 is distributed to the first distribution channel signal F1, the second distribution channel signal F2, and the third distribution channel signal F3, and the base signal B is bypassed and distributed. The base signal B 'is output.

In order to adjust the timbre characteristic according to the spatial environment, the timbre characteristic adjuster 3 controls only the first specific channel signal F1 output from the input signal distributor 2 to the desired specific signal according to the spatial environment (S3). The timbre characteristic adjusting unit 3 performs a gain and frequency characteristic process on the input first distribution channel signal and outputs a timbre characteristic signal of multiple stages.

The mutual comparison processing section 4 compares the tone feature signal F_s output from the tone feature adjusting unit 3 and the second distribution channel signal F2 output from the input signal distribution unit 2 and outputs the tone feature comparison signal F_c. (S4).

The harmonic implementation 5 receives the tone characteristic comparison signal F_c of the mutual comparison processing unit 4 to increase the density of a specific tone by emphasizing the tone characteristic of a specific portion and receives the harmonic signal through control on time and frequency characteristics. Implement and output the harmonic tone signal F_h (S5).

The mixing processor 6 synthesizes the harmonic tone signal F_h output from the harmonic implementation unit 5 and the second distribution channel signal F2 output from the input signal distribution unit 2 and outputs a synthesis characteristic signal F_mix (S6). This composite characteristic signal F_mix has the effect of raising the density and elasticity coefficient of sound and raising the sound image.

The spatial characteristic adjusting unit 7 obtains a frequency response characteristic signal F_a influencing the direction of space (S8). That is, the spatial characteristic adjusting unit 7 obtains the frequency characteristic that is a spatial direction element by using a plurality of filters formed in parallel with respect to the third distribution channel signal F3 output from the input signal distribution unit 2, and thus the frequency response characteristic signal F_a. Outputs

The spatial controller 8 synthesizes the composite characteristic signal F_mix output from the mixing processor 6 and the frequency response characteristic signal F_a output from the spatial characteristic controller 7 to combine the front L / R signal FS (L / R). Output (S7). That is, the spatial controller 9 emphasizes the frequency response characteristic signal F_a and the density of the sound according to the spatial characteristic response process while maintaining the original signal by the second distribution channel signal F2 input to the mixing processor 6. By synthesizing between the harmonic tone signals F_h, the position of the sound source can be positioned up once, and the position of the sound source can be adjusted back and forth as well as the width of the space.

In addition, the spatial controller 8 outputs the front center signal FC as a separate channel for emphasizing the mono component between the change of the sound image and the center of the sound. In this case, the front center signal FC is a signal obtained by combining L and R of the synthesis characteristic signal F_mix and passing through the band pass filter.

 The base signal synthesizing unit 9 synthesizes the distributed base signal B 'output from the input signal distribution unit 2 and the harmonic tone signal F_h output from the harmonic implementation unit 5 and passes the low pass filter to pass the base channel signal B'S. Outputs (S9). That is, the signal synthesizing unit 8 is a .1 channel signal processing unit for obtaining the characteristics of 2.1 or 3.1 channels. Increase the modulus while increasing the volume with the harmonic signal, not the size of.

The protection scope of the present invention should be interpreted by the following claims. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It should be interpreted that it is included in the scope of right.

1 is a schematic block diagram of an apparatus for generating a high quality virtual space sound by sound source position correction according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a detailed configuration of a tone characteristic control unit illustrated in FIG. 1.

FIG. 3 is a diagram illustrating a detailed configuration of the harmonic implementation unit illustrated in FIG. 1.

FIG. 4 is a diagram illustrating a detailed configuration of the space characteristic adjusting unit illustrated in FIG. 1.

FIG. 5 is a diagram illustrating a detailed configuration of the space controller shown in FIG. 1.

FIG. 6 is a diagram illustrating a detailed configuration of the base signal synthesis unit shown in FIG. 1.

FIG. 7 is a diagram illustrating a detailed configuration of the signal analyzer illustrated in FIG. 1.

8 is a flowchart illustrating a method of generating a high quality virtual space sound according to an embodiment of the present invention.

-Explanation of symbols for main parts-

1: channel mapping unit 2: input signal distribution unit

3: tone characteristic control unit 4: spatial characteristic adjustment unit

5: mutual comparison processing unit 6: harmonic implementation unit

7 mixing unit 8 base signal synthesis unit

9: space controller 10: signal analyzer

11: central processing unit

Claims (10)

An input signal distributor which expands and distributes the input two-channel signal to output a plurality of distribution channel signals; A tone feature adjusting unit for adjusting a tone characteristic according to a spatial environment through a multi-stage filter with respect to a first distribution channel signal among the plurality of distribution channel signals output from the input signal distribution unit, and outputting the tone characteristic signal; A mutual comparison processor configured to mutually process a second distribution channel signal among the plurality of distribution channel signals output from the tone signal characteristic controller and the plurality of distribution channel signals output from the input signal distributor, and output a tone characteristic comparison signal; A harmonic implementation for outputting a harmonic tone signal by implementing harmonic processing through control of time and frequency characteristics with respect to the tone feature comparison signal output from the mutual comparison processor; A mixing processor for synthesizing the harmonic tone signal output from the harmonic implementation unit and the second distribution channel signal output from the input signal distribution unit, and outputting a synthesis characteristic signal; A spatial characteristic adjusting unit for outputting a frequency response characteristic signal affecting the direction of space by passing a third distribution channel signal among the plurality of distribution channel signals output from the input signal distribution unit through a plurality of filters formed in parallel; And a spatial controller which cross-connects the synthesized characteristic signal output from the mixing processor and the frequency response characteristic signal output from the spatial characteristic controller according to HRTF principle to output a front L / R signal. Virtual space sound generating device. delete The method of claim 1, And the spatial control unit further outputs a front center signal passing through a band pass filter by combining the left signal and the write signal of the synthesis characteristic signal output from the mixing processor. The method of claim 3, The input signal distribution unit outputs a distribution base signal bypassing the base signal, And a base signal synthesizing unit configured to synthesize the distribution base signal output from the input signal distribution unit and the harmonic tone signal output from the harmonic implementation unit and output a base channel signal passing through a low pass filter. Virtual space sound generating device. The method of claim 4, wherein And a channel mapping unit configured to map a two-channel stereo signal or a multi-channel signal to output the two-channel signal and the base signal. The method of claim 4, wherein And a signal analyzer configured to automatically analyze whether the signal is a mono signal or a stereo signal by using the second distribution channel signal output from the input signal distributor for mode switching. Expanding and distributing the input two-channel signal to output a plurality of distribution channel signals; Adjusting a tone characteristic according to a spatial environment through a multi-stage filter with respect to a first distribution channel signal among the plurality of distribution channel signals and outputting the tone characteristic signal; Outputting a timbre characteristic comparison signal by comparing the timbre characteristic signal with a second distribution channel signal among the plurality of distribution channel signals; Outputting a harmonic timbre signal by implementing harmonic processing on the timbre characteristic comparison signal by controlling time and frequency characteristics; and Synthesizing the harmonic tone signal and the second distribution channel signal to output a synthesized characteristic signal; Outputting a frequency response characteristic signal influencing the direction of space by passing a third distribution channel signal of the plurality of distribution channel signals through a plurality of filters formed in parallel; and A front L / R signal obtained by cross-connecting the synthesized characteristic signal and the frequency response characteristic signal according to the HRTF principle and a left signal and a write signal of the synthesized characteristic signal are synthesized to pass the front center signal passed through a band pass filter. And outputting a virtual space sound. delete The method of claim 7, wherein And mapping the two-channel stereo signal or the multi-channel signal and outputting the two-channel signal and the base signal. 10. The method of claim 9, The outputting of the plurality of distribution channel signals may further include outputting a distribution base signal bypassing the base signal. And synthesizing the distribution base signal and the harmonic timbre signal and outputting a base channel signal passed through a low pass filter.

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