JP2012249048A - Acoustic processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily recognize a time change of a localization direction of each frequency component of an acoustic signal.SOLUTION: A display control part 40 displays a frequency characteristic image 50, in which a spectrogram of an acoustic signal x is arranged in a region A to which a frequency axis F1 and a time axis T1 are set, and a localization image 60, in which an acoustic image point q of each frequency component corresponding to a focal point on the time axis T1 among the acoustic signals x is arranged in a region B to which a frequency axis F2 and a localization axis L indicating a localization direction θ are set. A frequency/time designation region 52 defined by an object band aF on the frequency axis F1 and an object period aT on the time axis T1 is arranged in the region A, and a target designation region 62 defined by an object bF on the frequency axis F2 and an object localization area bL on the localization axis L for the acoustic signals x in the object period aT is arranged in the region B according to an instruction from a user. A signal processing part 36 suppresses or emphasizes each frequency component indicated by the acoustic image point q in the target designation region 62 among the acoustic signals x in the object period aT.

Description

  The present invention relates to a technique for displaying information related to an acoustic signal.

  Conventionally, a technique for suppressing or enhancing a component in which a sound image is localized in a predetermined direction in an acoustic signal has been proposed. For example, in Patent Document 1 and Patent Document 2, localization is performed forward (center) by multiplying each frequency component of the acoustic signal by a coefficient value set for each frequency according to the similarity between the left and right channels of the acoustic signal. A technique for suppressing the components to be generated is disclosed.

Japanese Patent No. 3670562 JP 2009-188971 A

  By the way, if the temporal change in the localization direction of each frequency component of the acoustic signal can be visually confirmed, a frequency component localized in a desired direction within a specific period (for example, a song localized in the center of the recorded sound of a song) This is convenient because the user can easily select (sound) as an object of suppression or emphasis. However, for example, in the spectrogram of the acoustic signal, only the temporal change of each frequency component of the acoustic signal is presented, and the temporal change of the localization direction of each frequency component cannot be confirmed. Therefore, it is difficult to select a component that is localized in a desired direction as an object of suppression or enhancement. In addition, a configuration in which an image of temporal changes in the localization direction of the acoustic signal is displayed in an area where the time axis and the localization axis indicating the localization direction are set is assumed, but the localization direction for each frequency component of the acoustic signal is also assumed. There is a problem that the change of can not be confirmed. In view of the above circumstances, an object of the present invention is to make it possible to easily visually confirm a temporal change in a localization direction for each frequency component of an acoustic signal.

  Means employed by the present invention to solve the above problems will be described. In order to facilitate the understanding of the present invention, in the following description, the correspondence between the elements of the present invention and the elements of the embodiments described later will be indicated in parentheses, but the scope of the present invention will be exemplified in the embodiments. It is not intended to be limited.

  In the sound processing apparatus of the present invention, receiving means (for example, the input device 24) for receiving an instruction from the user, a first frequency axis (for example, the frequency axis F1), and a first time axis (for example, the time axis T1) are set. The frequency characteristic image in which the spectrogram of the acoustic signal is arranged in the first region (for example, the region A), the second frequency axis (for example, the frequency axis F2), and the localization axis (for example, the localization axis L) indicating the localization direction are set. Means for causing a display device to display a localization image in which sound image points of each frequency component corresponding to a point of interest on the first time axis in an acoustic signal in a second region (for example, region B) are arranged. A frequency / time designation area defined by a target band on one frequency axis (for example, target band aF) and a target period on the first time axis (for example, target period aT) is set as the first area in response to an instruction to the receiving means. Placed and acoustic signal within the target period A target designation area defined by a target band (for example, target band bF) on the second frequency axis and a target localization area (for example, target localization area bL) on the localization axis according to an instruction to the receiving means. And a signal processing means for suppressing or emphasizing each frequency component (target component) indicated by the sound image point in the target designated area of the acoustic signal within the target period.

  In the above configuration, since the frequency characteristic image in which the spectrogram of the acoustic signal is arranged and the localization image in which the sound image point of each frequency component corresponding to the target point of the acoustic signal is displayed on the display device, each frequency of the acoustic signal is displayed. The user can easily visually confirm the temporal change in the localization direction of the component. In addition, since the target designation area corresponding to the target band of the frequency / time designation area of the frequency characteristic image is arranged in the localization image, the user can easily determine the relationship between the frequency, localization direction, and time for the target component of the acoustic signal. There is also an advantage that it can be grasped. Note that the range of the acoustic signal in which the sound image point is arranged in the localization image is arbitrary, but for example, in a configuration in which the acoustic signal is divided into a plurality of unit sections, a predetermined number (single or A configuration in which the display control means arranges the sound image points of each frequency component in a plurality of unit sections in the second region is preferable. The order of designation of the target designation area and the frequency / time designation area is arbitrary. That is, both the configuration in which the frequency / time designation region is arranged after the designation of the target designation region and the configuration in which the target designation region is arranged after the designation of the frequency / time designation region are included in the scope of the present invention.

  The above-described effect of the present invention becomes particularly remarkable when the frequency characteristic image and the localization image are displayed in parallel (simultaneously) on the display device. However, the frequency characteristic image and the localization image can be selectively displayed according to an instruction from the user, for example.

  In a preferred aspect of the present invention, the display control means determines the distribution of the sound image points of each frequency component for each predetermined unit section in which the acoustic signal is divided, in the direction of the time axis that intersects the second frequency axis and the localization axis. A stereo image arranged three-dimensionally is displayed on a display device. In the above aspect, there exists an advantage that a user can grasp | ascertain the temporal change of distribution of each sound image point of the acoustic signal x easily. In addition, the specific example of the above aspect is later mentioned, for example as 5th Embodiment.

  In a preferred aspect of the present invention, the display control means arranges a plurality of target designation areas having different target bands or target localization areas in the second area in accordance with instructions to the reception means, and each target designation area A plurality of frequency / time designating areas corresponding to are arranged in the first area so as to overlap each other. In the above aspect, a plurality of target designation areas having different target bands or target localization areas are arranged so as to overlap the second area, and a plurality of frequency / time designation areas corresponding to each target designation area are in the first area. It is arranged so that it can overlap. Therefore, there is an advantage that the user can easily specify a plurality of types of components having different frequencies, periods, and localization directions as target components. In addition, the specific example of the above aspect is later mentioned as 2nd Embodiment, for example.

  In a preferred aspect of the present invention, the display control means sets a plurality of frequency / time designation areas corresponding to the target designation area at different time points on the first time axis in the first area. In the above aspect, since a plurality of frequency / time specifying areas corresponding to one target specifying area are arranged in the first area, for example, target components generated intermittently within a predetermined band can be specified easily and appropriately. Is possible. In addition, the specific example of the above aspect is later mentioned, for example as 3rd Embodiment.

  In a preferred aspect of the present invention, the display control means displays the frequency component corresponding to each sound image point in the target designated region and the other frequency components in the spectrogram in the first region in different manners. In the above aspect, since the frequency component corresponding to each sound image point inside the target designation region and the frequency component corresponding to each sound image point outside are displayed in different modes, the target component is the object of suppression or enhancement. There is an advantage that the user can easily grasp the frequency component from the frequency characteristic image. In addition, the specific example of the above aspect is later mentioned, for example as 6th Embodiment.

  In a preferred aspect of the present invention, the display control means includes both the frequency / time designation area and the target designation area according to a change instruction given to the reception means for one target band of the frequency / time designation area and the target designation area. Change the target bandwidth. In the above aspect, there exists an advantage that the burden of the user at the time of changing an object band is reduced.

  In a preferred aspect of the present invention, the display control means arranges spectrograms of the first channel signal (for example, the acoustic signal xL) and the second channel signal (for example, the acoustic signal xR) constituting the acoustic signal in the first region. Then, the spectrogram (for example, spectrogram SL) of the first channel signal and the spectrogram (for example, spectrogram SR) of the second channel signal are changed to different display modes according to the position of the target designation region on the localization axis. In the above mode, since the display mode of each spectrogram is controlled according to the position of the target designation region, there is an advantage that the user can intuitively grasp the localization position of the target component from the frequency characteristic image. Note that the region in which the display mode is changed according to the position of the target designation region may be either the whole or a part of the spectrogram. That is, in addition to the configuration in which the display mode over the entire spectrogram is different between the first channel signal and the second channel signal, for example, the display mode within the frequency / time designation region of the spectrogram is changed to the first channel signal and the second channel signal. A configuration that is different from that of the channel signal may also be adopted. In addition, the specific example of the above aspect is later mentioned as 4th Embodiment, for example.

  In a preferred aspect of the present invention, the display control means includes the acoustic signal before or after the processing by the signal processing means in the third area (for example, the area C) in which the second time axis (for example, the time axis T2) is set. The waveform image in which the waveform is arranged is displayed on the display device together with the frequency characteristic image and the localization image. In the above aspect, since the waveform image of the acoustic signal is displayed on the display device together with the frequency characteristic image and the localization image, there is an advantage that it can be easily grasped by the relationship between the target period of the target component and the waveform of the acoustic signal. In addition, according to the configuration in which the display control unit arranges the time designation area indicating the target period on the second time axis in the third area, the above effect becomes particularly remarkable.

  In a preferred aspect of the present invention, the display control means includes both the frequency / time designation area and the time designation area in accordance with a change instruction given to the reception means for one target period of the frequency / time designation area and the time designation area. Change the target period. In the above aspect, there exists an advantage that the burden of the user at the time of changing a target period is reduced.

  In addition, the display mode in each of the above-described forms means an image state that can be visually recognized by an observer. Specific examples of display modes include shape, dimensions, gradation, color, presence / absence of blinking, and the like.

  The sound processing device according to each of the above aspects is realized by hardware (electronic circuit) such as a DSP (Digital Signal Processor) dedicated to generation of a processing coefficient sequence, and a general-purpose device such as a CPU (Central Processing Unit). This is also realized by cooperation between the arithmetic processing unit and the program. A program according to the present invention includes a receiving means for receiving an instruction from a user, a frequency characteristic image in which a spectrogram of an acoustic signal is arranged in a first region in which a first frequency axis and a first time axis are set, A localization device in which a sound image point of each frequency component corresponding to a point of interest on the first time axis in an acoustic signal is arranged in a second region in which two frequency axes and a localization axis indicating a localization direction are set. A frequency / time designation region defined by a target band on the first frequency axis and a target period on the first time axis is arranged in the first region according to an instruction to the reception unit, Display control means for arranging a target designation area defined by a target band on the second frequency axis and a target localization area on the localization axis in the second area for an acoustic signal within the target period in response to an instruction to the reception means; , Acoustic signal within the target period In other words, the computer is caused to function as signal processing means for suppressing or enhancing each frequency component indicated by the sound image point in the target designation region. According to the above program, the same operation and effect as the sound processing apparatus according to the present invention are exhibited. The program of the present invention is provided to a user in a form stored in a computer-readable recording medium and installed in the computer, or provided from a server device in a form of distribution via a communication network and installed in the computer. Is done.

1 is a block diagram of a sound processing apparatus according to a first embodiment. It is a schematic diagram of the edit screen in 1st Embodiment. It is a schematic diagram of the edit screen in 2nd Embodiment. It is a schematic diagram of the edit screen in 3rd Embodiment. It is a schematic diagram of the edit screen in 4th Embodiment. It is a schematic diagram of the edit screen in 5th Embodiment. It is a schematic diagram of the edit screen in 6th Embodiment.

<A: First Embodiment>
FIG. 1 is a block diagram of a sound processing apparatus 100 according to the first embodiment of the present invention. As shown in FIG. 1, the sound processing device 100 is realized by a computer system including an arithmetic processing device 12, a storage device 14, a signal supply device 22, an input device 24, a display device 26, and a sound emitting device 28. The input device 24 is a device (accepting means) that accepts an instruction from a user, and includes, for example, a plurality of operators. The display device 26 (for example, a liquid crystal display device) displays various images under the control of the arithmetic processing device 12.

  The signal supply device 22 supplies the arithmetic processing device 12 with an acoustic signal x (xL, xR) indicating a waveform of a mixed sound of a plurality of sounds (singing sound and accompaniment sound) generated by sound sources present at different positions. The left channel acoustic signal xL and the right channel acoustic signal xR are collected or processed so that the sound images corresponding to each sound source are located at different positions (for example, processing for changing the amplitude ratio and delay amount between the left and right channels). Stereo signal. Sound collecting device (stereo microphone) that picks up surrounding sound and generates sound signal x, playback device that reads sound signal x from a portable or built-in recording medium (for example, CD), and sound from a communication network A communication device that receives the signal x may be employed as the signal supply device 22.

  The storage device 14 stores a program executed by the arithmetic processing device 12 and various data used by the arithmetic processing device 12. A known recording medium such as a semiconductor recording medium or a magnetic recording medium or a combination of a plurality of types of recording media is arbitrarily employed as the storage device 14. Note that a configuration in which the acoustic signal x (xL, xR) is stored in the storage device 14 (therefore, the signal supply device 22 is omitted) may be employed.

  The arithmetic processing device 12 executes a program stored in the storage device 14 to thereby generate a plurality of functions (frequency analysis) for generating the acoustic signal y (yL, yR) from the acoustic signal x supplied by the signal supply device 22. Unit 32, coefficient sequence generation unit 34, signal processing unit 36, waveform synthesis unit 38, display control unit 40). The left-channel acoustic signal yL and the right-channel acoustic signal yR are stereo signals in which a specific component (hereinafter referred to as “target component”) of the acoustic signal x is suppressed or enhanced with respect to other components. Each frequency component in which the sound image is localized in a predetermined direction in the acoustic signal x is suppressed or enhanced as a target component. A configuration in which each function of the arithmetic processing unit 12 is distributed over a plurality of integrated circuits, or a configuration in which a dedicated electronic circuit (DSP) realizes each function may be employed. The sound emitting device 28 (for example, a stereo speaker or a stereo headphone) in FIG. 1 emits a sound wave corresponding to the acoustic signal y (yL, yR) generated by the arithmetic processing device 12.

  The frequency analysis unit 32 sequentially generates the frequency spectrum XL of the acoustic signal xL and the frequency spectrum XR of the acoustic signal xR for each unit section (frame) on the time axis. The frequency spectrum XL is a series of a plurality of frequency components XL (f, m) corresponding to different frequencies (frequency bands) f. Similarly, the frequency spectrum XR is composed of a plurality of frequency components XR (f, m). The symbol m means each time point (unit section number) on the time axis. For the generation of the frequency spectrum XL and the frequency spectrum XR, a known frequency analysis technique such as short-time Fourier transform is arbitrarily employed.

  The coefficient sequence generator 34 sequentially generates a processing coefficient sequence G (m) for suppressing or enhancing the target component of the acoustic signal x for each unit section. The processing coefficient sequence G (m) is a series of a plurality of coefficient values g (f, m) corresponding to different frequencies f. Each coefficient value g (f, m) corresponds to a gain (spectral gain) for the frequency component XL (f, m) and the frequency component XR (f, m) of the acoustic signal x, and the target component of the acoustic signal x is suppressed. Or selected to be emphasized. Details of the process of selecting each coefficient value g (f, m) will be described later.

  The signal processing unit 36 applies the processing coefficient sequence G (m) generated by the coefficient sequence generation unit 34 to each of the frequency spectrum XL and the frequency spectrum XR, thereby causing the frequency spectrum YL (frequency component YL (f, f, m)) and the frequency spectrum YR (frequency component YR (f, m)) of the acoustic signal yR are generated for each unit section. Specifically, the product of the frequency component XL (f, m) of the acoustic signal xL and the coefficient value g (f, m) of the processing coefficient sequence G (m) is the frequency component YL (f, m) of the acoustic signal yL. ) And the product of the frequency component XR (f, m) of the acoustic signal xR and the coefficient value g (f, m) is calculated as the frequency component YR (f, m) of the acoustic signal yR.

  The waveform synthesis unit 38 generates the acoustic signal yL and the acoustic signal yR from the frequency spectrum YL and the frequency spectrum YR generated by the signal processing unit 36. Specifically, the waveform synthesizer 38 generates the acoustic signal yL by converting the frequency spectrum YL for each unit section into a signal in the time domain and connecting them in the front and back unit sections. Similarly, the waveform synthesizer 38 generates an acoustic signal yR from the frequency spectrum YR for each unit section. The acoustic signal y (yL, yR) generated by the waveform synthesizer 38 is supplied to the sound emitting device 28 and reproduced as a sound wave.

  The display control unit 40 in FIG. 1 causes the display device 26 to display the editing screen 45 in FIG. 2 that is referred to by the user for designating the target component. As shown in FIG. 2, the editing screen 45 includes a frequency characteristic image 50, a localization image 60, and a waveform image 70.

  The frequency characteristic image 50 includes a region A in which a time axis T1 and a frequency axis F1 intersecting each other are set. In the region A, the spectrogram SL of the acoustic signal xL (the time series of the frequency spectrum XL in which the intensity is expressed by gradation and color) and the spectrogram SR of the acoustic signal xR are arranged in parallel. In addition, an indicator (cursor) 54 indicating an arbitrary time point on the time axis T1 (hereinafter referred to as “point of interest”) is arranged in the region A. The spectrogram of the acoustic signal y (yL, yR) after processing by the signal processing unit 36 is arranged in the region A, and the spectrograms of the acoustic signal x and the acoustic signal y are switched according to an instruction from the user. In this case, a configuration arranged in the region A can also be adopted.

  The localization image 60 of FIG. 2 includes a region B where a localization axis L and a frequency axis F2 intersecting each other are set. The localization axis L is a coordinate axis indicating the localization direction θ of the sound image. The origin (θ = 0) of the localization axis L corresponds to the front direction of the listening point. Further, the positive region (θ> 0) with respect to the origin of the localization axis L corresponds to the right side direction with respect to the front surface, and the negative region (θ <0) corresponds to the left side direction with respect to the front direction. .

  A plurality of sound image points q are arranged in the region B of the localization image 60. The sound image point q located at coordinates corresponding to the localization direction θ on the localization axis L and the frequency f on the frequency axis F2 indicates that the frequency component of the frequency f localized in the localization direction θ exists in the acoustic signal x. means.

The display control unit 40 calculates the localization direction θ of each frequency f of the acoustic signal x for each unit section. For the calculation of the localization direction θ, for example, the following formula (1) is preferably used. The symbol | XL (f, m) | in Equation (1) means the amplitude of the frequency component XL (f, m) of the acoustic signal xL, and the symbol | XR (f, m) | is the frequency component XR (f, m). ) Amplitude. In the acoustic signal x, each sound image point q specified by Expression (1) for one unit section corresponding to the point of interest specified by the indicator 54 of the frequency characteristic image 50 is arranged in the region B. For the significance and derivation of Equation (1), see, for example, M. Vinyes, J. Bonada, A. Loscos, "Demixing Commercial Music Productions wia Human-Assisted Time-Frequency Masking", Audio Engineering Society 120th Convention, France, As understood from 2006.
θ = 2 · arctan (| XL (f, m) | / | XR (f, m) |) · 2 // − 1 (1)

  The user can designate an arbitrary area 62 (hereinafter referred to as “target designation area”) 62 within the area B by appropriately operating the input device 24. As shown in FIG. 2, the display control unit 40 causes the display device 26 to display a target designation area 62 instructed by the user. The target designation area 62 is a rectangular area defined by an arbitrary range (hereinafter referred to as “target localization area”) bL on the localization axis L and an arbitrary range (hereinafter referred to as “target band”) bF on the frequency axis F2. is there. The user can arbitrarily change the target localization area bL and the target band bF of the target designation area 62 by operating the input device 24. The frequency component of each frequency f corresponding to the sound image point q located inside the target designation area 62 in the acoustic signal x is the target of suppression or enhancement as the target component. That is, among the frequency components (XL (f, m), XR (f, m)) of the acoustic signal x in the target band bF, the target component that is localized in the localization direction θ in the target localization area bL is suppressed or emphasized. The

  The user can designate an arbitrary amplification factor α for the target designation region 62 by appropriately operating the input device 24. The display control unit 40 adds the amplification factor α (40 dB in the example of FIG. 2) designated by the user to the target designation region 62. When the amplification factor α of the target designation area 62 is set to a negative number, the target component is suppressed, and when the amplification factor α is set to a positive number, the target component is emphasized.

  When the target designation area 62 is set in the area B and a predetermined operation (for example, pressing of the apply button) is given to the input device 24, the display control unit 40, as shown in FIG. A frequency / time designating area 52 corresponding to is arranged in the area A of the frequency characteristic image 50. The frequency / time designation region 52 is a rectangular region defined by a specific range (hereinafter referred to as “target period”) aT on the time axis T1 and a target band aF on the frequency axis F1, and includes the acoustic signal xL and the acoustic signal. It is arranged so as to overlap each spectrogram of xR. The target band aF in the frequency / time designation area 52 is set to a band common to the target band bF in the target designation area 62.

  The user can arbitrarily change the target band aF in the frequency / time designation area 52 by operating the input device 24. The display control unit 40 changes both the target band aF and the target band bF in conjunction with each other in response to an instruction to change one of the target band aF in the frequency / time specifying area 52 and the target band bF in the target specifying area 62. The target band aF and the target band bF are maintained in a common band. On the other hand, the target period aT of the frequency / time specifying area 52 is set to a predetermined time length (for example, all sections of the acoustic signal x) when the target specifying area 62 of the localization image 60 is newly set. It is arbitrarily changed according to instructions from the user.

  The waveform image 70 in FIG. 2 includes a region C in which the time axis T2 is set. The time axis T2 is a coordinate axis common to the time axis T1 of the frequency characteristic image 50. In the area C, a waveform WL of the acoustic signal xL, a waveform WR of the acoustic signal xR, and an indicator (cursor) 74 indicating a point of interest on the time axis T2 are arranged. The indicator 74 of the waveform image 70 and the indicator 54 of the frequency characteristic image 50 indicate a common point of interest of the acoustic signal x. It should be noted that the waveform of the acoustic signal y (yL, yR) after processing by the signal processing unit 36 is arranged in the region C, and each waveform of the acoustic signal x and the acoustic signal y is switched according to an instruction from the user. In this case, a configuration arranged in the region C can also be adopted.

  In the area C, a time designation area 72 is set. The time designation area 72 is a rectangular area over the target period cT on the time axis T2. The target period cT in the time designation area 72 and the target period aT in the frequency / time designation area 52 are common. The user can arbitrarily change the target period cT of the time designation area 72 by operating the input device 24. The display control unit 40 changes both the target period aT and the target period cT in response to an instruction to change one of the target period aT in the frequency / time specifying area 52 and the target period cT in the time specifying area 72. The target period aT and the target period cT are maintained in a common period.

  When the user instructs to reproduce sound by operating the input device 24, the generation of the processing coefficient sequence G (m) by the coefficient sequence generation unit 34 and the generation of the acoustic signal y by the signal processing unit 36 are sequentially executed to generate the sound. A sound wave corresponding to the signal y is reproduced from the sound emitting device 28. The point of interest (reproduction point) indicated by the indicator 54 of the frequency characteristic image 50 and the indicator 74 of the waveform image 70 moves along the time axis T1 and the time axis T2 as the reproduction proceeds. In addition, the user can designate a desired time point as a point of interest by appropriately operating the input device 24 and moving the indicator 54 and the indicator 74. In the region B of the localization image 60, a plurality of sound image points q corresponding to one unit section of the target point are displayed and updated as needed as the target point moves.

  The user can newly set the target designation area 62 in the area B of the localization image 60 or change the existing target designation area 62 at any time point during reproduction or stop of the sound. For example, the user refers to the distribution of each sound image point q displayed on the localization image 60 and the spectrogram (SL, SR) displayed on the frequency characteristic image 60 with respect to the point of interest, and the reproduced sound from the sound emitting device 28. While listening, the target designation area 62 is set or changed so as to include the sound image point q corresponding to the frequency f and the localization direction θ desired to be suppressed or enhanced, and the target component of the acoustic signal x is suppressed or enhanced. The desired period is specified as the target period aT in the frequency / time specifying area 52 or the target period cT in the time specifying area 72.

  When the point of interest indicated by the indicator 54 and the indicator 74 exists outside the target period aT (cT), the target designation region 62 is not displayed in the region B of the localization image 60 (each sound image point q is displayed). When the point of interest is located inside the target period aT, the target designation area 62 is displayed together with each sound image point q in the area B of the localization image 60 as illustrated in FIG. That is, the display / non-display of the target designation area 62 changes every moment as the point of interest moves (progress of reproduction).

  For each unit section outside the target period aT (cT), the coefficient sequence generator 34 sets all coefficient values g (f, m) of the processing coefficient sequence G (m) to a predetermined numerical value γ1. The numerical value γ1 is set to a numerical value (for example, 1) that does not change the intensity before and after the processing by the signal processing unit 36. On the other hand, for each unit section inside the target period aT (cT), the coefficient sequence generation unit 34 determines that the target component specified in the target specifying area 62 corresponding to the unit section of the acoustic signal x corresponds to the amplification factor α. Each coefficient value g (f, m) of the processing coefficient sequence G (m) is set so as to be suppressed or emphasized.

  For example, when the amplification factor α is a negative number (suppression of the target component), the coefficient sequence generator 34 calculates the coefficient value g (f, m) of each frequency f corresponding to the sound image point q outside the target designation area 62. The coefficient value g (f, m) of each frequency f (that is, each frequency f of the target component) corresponding to the sound image point q inside the target designation area 62 is set to the numerical value γg1. The numerical value γg1 is variably set within the range of positive numbers less than 1 according to the amplification factor α so that the larger the absolute value of the amplification factor α (the greater the degree of suppression of the target component), the smaller the numerical value γg1. Is done. Therefore, an acoustic signal y in which the target component of the acoustic signal x is suppressed by comparing with other components is generated by processing by the signal processing unit 36.

  On the other hand, when the amplification factor α is a positive number (emphasis of the target component), the coefficient sequence generator 34 generates a coefficient value g (f, m) of each frequency f corresponding to the sound image point q outside the target designation area 62. Is set to the numerical value γ0, and the coefficient value g (f, m) of each frequency f corresponding to the sound image point q inside the target designation area 62 is set to the numerical value γg2. The numerical value γ0 is set to a numerical value (for example, 0) that decreases the strength by the processing by the signal processing unit 36. On the other hand, the numerical value γg2 is set variably in accordance with the amplification factor α within a positive number range of less than 1 so that the absolute value of the amplification factor α is larger (the degree of emphasis of the target component is larger). The Therefore, an acoustic signal y in which the target component of the acoustic signal x is emphasized with respect to other components is generated by processing by the signal processing unit 36.

  Each coefficient value g (f, m) corresponding to the sound image point q outside the target designation area 62 is set to an intermediate value (for example, 0.5) between the numerical value γ0 and the numerical value γ1, and the inside of the target designation area 62 is set. By setting each coefficient value g (f, m) corresponding to the sound image point q in accordance with the amplification factor α (negative or positive), the target component of the acoustic signal x is suppressed or enhanced with respect to other components. It is also possible to do.

  In the first embodiment described above, each sound image point q of each frequency component of the unit section corresponding to the point of interest indicated by the indicator 54 of the frequency characteristic image 50 and the indicator 74 of the waveform image 70 in the acoustic signal x is obtained. It is arranged in the region B of the localization image 60. Therefore, there is an advantage that a temporal change in the localization direction θ can be easily visually confirmed for each frequency component of the acoustic signal x. In addition, a frequency characteristic image 50 including a frequency / time designation region 52 defined by the target band aF and the target period aT, and a localization image 60 including a target designation region 62 defined by the target band bF and the target localization region bL. Are displayed in parallel on the display device 26. Accordingly, for the target component to be suppressed or emphasized in the acoustic signal x, the range of the frequency f (target band aF and target band bF), the range of the localization direction θ (target localization area bL), and the time range (target period aT). There is also an advantage that the user can easily grasp the relationship with Furthermore, in the first embodiment, since the waveform image 70 is also displayed on the display device 26 together with the frequency characteristic image 50 and the localization image 60, the target period cT of the target component is related to the waveform (WL, WR) of the acoustic signal x. There is also an advantage that it can be easily grasped.

<B: Second Embodiment>
A second embodiment of the present invention will be described below. In addition, about the element which an effect | action and a function are equivalent to 1st Embodiment in each form illustrated below, each reference detailed in the above description is diverted and each detailed description is abbreviate | omitted suitably.

  FIG. 3 is a schematic diagram of the frequency characteristic image 50 and the localization image 60 in the editing screen 45 of the second embodiment. Note that the spectrograms (SL, SR) of the frequency characteristic image 50 are omitted in FIG. 3 for convenience.

  As shown in FIG. 3, the display control unit 40 according to the second embodiment localizes a plurality of target designation areas 62 (621, 622) having different target bands bF or target localization areas bL according to instructions from the user. Set in area B of image 60. The user can individually change the target band bF, the target localization area bL, and the amplification factor α for each of the target designation area 621 and the target designation area 622. The target designation area 621 and the target designation area 622 can be arranged in the area B so as to be separated from each other, and can also be arranged at positions overlapping each other as illustrated in FIG.

  As shown in FIG. 3, a frequency / time designation area 521 corresponding to the target designation area 621 and a frequency / time designation area 522 corresponding to the target designation area 622 are set in the area A of the frequency characteristic image 50. . The user can individually set the target band aF and the target period aT for each of the frequency / time designation area 521 and the frequency / time designation area 522. Therefore, the frequency / time designation area 521 and the frequency / time designation area 522 can be arranged apart from each other in the area A, and can also be arranged at positions overlapping each other as illustrated in FIG.

  In a state where the indicator 54 and the indicator 74 indicate the time point ta at which only the frequency / time specifying region 521 exists on the time axis T1 as the point of interest, only the target specifying region 621 is arranged in the region B of the localization image 60. . On the other hand, in the state where the point in time tb in which both the frequency / time specifying area 521 and the frequency / time specifying area 522 exist is designated as the point of interest, both the target specifying area 621 and the target specifying area 622 are shown in FIG. Are arranged in the region B of the localization image 60. Further, only the target designation area 622 is arranged in the area B when the time point tc is designated as the point of interest.

  For the unit section in which both the target designation area 621 and the target designation area 622 are designated in the acoustic signal x, the coefficient sequence generation unit 34 processes the processing coefficient series GA (m) of the target designation area 621 and the target designation area 622. Each of the coefficient sequences GB (m) is generated by the same method as in the first embodiment, and the processing coefficient sequence GA (m) and the processing coefficient sequence GB (m) are combined (for example, coefficient values g ( A processing coefficient sequence G (m) is generated by addition or multiplication of f, m).

  In the second embodiment, the same effect as in the first embodiment is realized. In the second embodiment, a plurality of target designation areas 62 (621, 622) are arranged in the area B of the localization image 60, and a plurality of frequency / time designation areas 52 (521, 521) corresponding to the target designation areas 62 are provided. 522) is arranged in the region A of the frequency characteristic image 50. Therefore, a plurality of types of target components having different frequencies f (target band aF), generation period (target period aT), and localization direction (target localization area bL) can be easily specified as suppression or enhancement targets. is there.

<C: Third Embodiment>
FIG. 4 is a schematic diagram of the frequency characteristic image 50 and the localization image 60 in the editing screen 45 of the third embodiment. As in FIG. 3, the spectrogram (SL, SR) of the frequency characteristic image 50 is not shown in FIG.

  The display control unit 40 of the third embodiment displays a plurality of frequency / time designation areas 52 (52A, 52B) corresponding to one target designation area 62 of the localization image 60 in accordance with an instruction from the user. 50 regions A are arranged. The user can individually set the target period aT for each of the frequency / time specifying area 52A and the frequency / time specifying area 52B. Therefore, the frequency / time designation area 52A and the frequency / time designation area 52B can be arranged at different time points (positions spaced from each other) on the time axis T1. On the other hand, the target band aF on the frequency axis F1 is common to the frequency / time designation area 52A and the frequency / time designation area 52B.

  In the third embodiment, the same effect as in the first embodiment is realized. In the third embodiment, since a plurality of frequency / time designation areas 52 (52A, 52B) corresponding to one target designation area 62 are arranged in the area A of the frequency characteristic image 50, for example, within a predetermined band It is possible to appropriately specify a target component (for example, a singing sound generated with an interval) intermittently generated at a frequency f.

  Note that the third embodiment can be applied to a configuration in which a plurality of target designation areas 62 (621, 622) can be designated in the area B as in the second embodiment. For example, a plurality of frequency / time designation areas 52 corresponding to the target designation area 621 and a plurality of frequency / time designation areas 52 corresponding to the target designation area 622 are arranged in the area A in different display modes (for example, colors). The structure which does is suitable.

<D: Fourth Embodiment>
FIG. 5 is a schematic diagram of the frequency characteristic image 50 and the localization image 60 in the editing screen 45 of the fourth embodiment. The display control unit 40 according to the fourth embodiment displays each display mode (gradation in the following example) of the spectrogram SL of the acoustic signal xL and the spectrogram SR of the acoustic signal xR arranged in the region A of the frequency characteristic image 50. The position is changed according to the position of the target designation region 62 on the localization axis L in the localization image 60 (that is, the localization direction θ of the target component).

  As shown in part (a) of FIG. 5, when the target designation region 62 is set on the positive side (right direction) with respect to the origin on the localization axis L (that is, the component localized in the right direction is used as the target component). When designated), the display control unit 40 displays the spectrogram SR in the region A in a low gradation compared with the spectrogram SL. As the center of gravity (centroid) of the target designation area 62 is separated from the origin in the right direction, the gradation of the spectrogram SR decreases as compared with the spectrogram SL. Similarly, as shown in part (b) of FIG. 5, the spectrogram SL is displayed at a lower gradation as compared to the spectrogram SR as the center of gravity of the target designation area 62 is further away from the origin toward the negative side (leftward). The When the center of gravity of the target designation area 62 is located at the origin on the localization axis L, the spectrogram SL and the spectrogram SR are displayed with the same gradation.

  In the fourth embodiment, the same effect as in the first embodiment is realized. Further, in the fourth embodiment, since the display modes of the spectrogram SR and the spectrogram SL change according to the position on the localization axis L of the target designation region 62, the user can specify the localization direction of the target component in the frequency characteristic image 50. There is an advantage that it can be grasped intuitively.

  In the above description, the display mode of the spectrogram SR and the spectrogram SL is changed at any time in parallel with the designation of the target designation area 62. For example, after the designation of the target designation area 62, a predetermined operation ( For example, a configuration that changes the display mode of the spectrogram SR and the spectrogram SL when the confirmation button is pressed) may be employed.

  In the above description, the overall display modes of the spectrogram SR and the spectrogram SL are made different according to the position of the target designation area 62. However, the partial display modes of the spectrogram SR and the spectrogram SL are made different. Is also adopted. For example, only the display mode within the range of the frequency / time specification region 52 corresponding to the target specification region 62 is made different between the spectrogram SR and the spectrogram SL according to the position of the target specification region 62, and the display mode of other regions is common. It is also possible to make it.

<E: Fifth Embodiment>
FIG. 6 is a schematic diagram of a localization image 60 in the fifth embodiment. As shown in FIG. 6, the localization image 60 displayed on the display device 26 by the display control unit 40 according to the sixth embodiment includes a plurality of unit images U corresponding to different time points (unit sections) of the acoustic signal x. It is an image arranged three-dimensionally along a time axis T0 intersecting the axis F2 and the localization axis L. In one unit image U corresponding to each time point of the acoustic signal x, a plurality of sound image points q and target designation areas 62 corresponding to the unit section at that time point in the acoustic signal x are arranged. The position of each unit image U on the time axis T0 is sequentially arranged so that one unit image U corresponding to the point of interest indicated by the indicator 54 and the indicator 74 among the plurality of unit images U is displayed in the foreground. Be changed. Each unit image U can be displayed in a transparent manner.

  In the fifth embodiment, the same effect as in the first embodiment is realized. In the fifth embodiment, since the plurality of unit images U in which the sound image points q at different times of the acoustic signal x are disposed are arranged three-dimensionally along the time axis T0, the distribution of the sound image points q and the target There is an advantage that the temporal transition of the relationship with the designated area 62 can be easily grasped from the localization image 60.

<F: Sixth Embodiment>
FIG. 7 is a partial schematic diagram of the frequency characteristic image 50 and the localization image 60 in the sixth embodiment. As shown in FIG. 7, a plurality of frequencies f on the frequency axis F 2 are a frequency fa corresponding to the sound image point q inside the target designation area 62 and a frequency fb corresponding to the sound image point q outside the target designation area 62. It is divided into and. In addition to selecting the frequency f outside the target band bF in the target designation area 62 as the frequency fa, the frequency f corresponding to the sound image point q located outside the target localization area bL is also the frequency f inside the target band bF. The frequency fb is selected.

  FIG. 7 schematically shows each frequency component XL (f, m) of the frequency spectrum XL corresponding to one unit section of the acoustic signal x in the spectrogram SL of the frequency characteristic image 50. As shown in FIG. 7, the display control unit 40 sets the frequency component XL (fa, m) of each frequency fa in the frequency spectrum XL where the sound image point q is located inside the target designation region 62 and the sound image point q as the target. The frequency components XL (fb, m) of the respective frequencies fb located outside the designated area 62 are displayed in different display modes (for example, gradation). In FIG. 7, it is assumed that the frequency component XL (fa, m) of the frequency fa is displayed in black (low gradation) and the frequency component XL (fb, m) of the frequency fb is displayed in white (high gradation). ing. Although only the spectrogram SL (frequency spectrum XL) is shown in FIG. 7, the spectrogram SR is also displayed in the same manner.

  In the sixth embodiment, the same effect as in the first embodiment is realized. In the sixth embodiment, the frequency component XL (fa, m) corresponding to the sound image point q inside the target designation region 62 and the frequency component XL (fb, f) corresponding to the sound image point q outside the target designation region 62 are used. m) is displayed on the frequency characteristic image 50 in a different manner from that of the frequency characteristic image 50, so that the user can easily grasp the frequency component XL (f, m) to be suppressed or emphasized as the target component from the frequency characteristic image 50. There are advantages.

  In the above example, the gradation is different between the frequency component XL (fa, m) of the frequency fa and the frequency component XL (fb, m) of the frequency fb, but the frequency component XL (fa, m) and the frequency component are different. A method of visually distinguishing XL (fb, m) is arbitrary. For example, the frequency component XL (fa, m) and the frequency component XL (fb, m) have different colors, or one of the frequency component XL (fa, m) and the frequency component XL (fb, m) is displayed. It is also possible to blink.

<G: Modification>
Various modifications are added to the above embodiment. Specific modifications are exemplified below. Two or more aspects arbitrarily selected from the following examples may be merged.

(1) In each of the above-described embodiments, the spectrogram SL of the acoustic signal xL and the spectrogram SR of the acoustic signal xR are arranged in the region A. However, the spectrogram or acoustic of the mixed signal (monaural signal) of the acoustic signal xL and the acoustic signal xR is used. It is also possible to place one spectrogram of the signal xL and the acoustic signal xR in the region A. The same applies to the waveform image 70, and a configuration in which the waveform of the mixed signal of the acoustic signal xL and the acoustic signal xR or one of the acoustic signal xL and the acoustic signal xR is arranged in the region C is also employed. Moreover, the structure which abbreviate | omitted the waveform image 70 is also employ | adopted.

(2) In each of the above-described embodiments, the sound image point q corresponding to each frequency component in one unit section of the acoustic signal x is arranged in the region B, but each frequency component over a plurality of unit sections of the acoustic signal x It is also possible to arrange the sound image point q in the region B. For example, an average value and an added value of the localization direction θ over a plurality of unit sections are calculated for each frequency f, and a sound image point q corresponding to each numerical value is arranged in the region B.

(3) In each of the above-described embodiments, the area A, the area B, and the area C are displayed in parallel, but each area can be selectively displayed. For example, the display control unit 40 causes the display device 26 to display at least one region selected by the user by operating the input device 24 among the regions A, B, and C.

(4) The shapes of the frequency / time designation area 52, the target designation area 62, and the time designation area 72 are arbitrary, and are not limited to the rectangular shapes exemplified in the above embodiments.

(5) Two or more modes arbitrarily selected from the first to sixth embodiments may be merged.

DESCRIPTION OF SYMBOLS 100 ... Sound processing device, 12 ... Arithmetic processing device, 14 ... Memory | storage device, 22 ... Signal supply device, 24 ... Input device, 26 ... Display device, 28 ... Sound emission device, 32 ... Frequency Analysis unit 34... Coefficient sequence generation unit 36... Signal processing unit 38... Waveform synthesis unit 40... Display control unit 45 45 Edit screen 50. Time designation area, 54... Indicator, 60... Localization image, 62... Target designation area, 70.

Claims (5)

A reception means for receiving instructions from the user;
A frequency characteristic image in which a spectrogram of an acoustic signal is arranged in a first area in which a first frequency axis and a first time axis are set, and a second area in which a second frequency axis and a localization axis indicating a localization direction are set Means for displaying a localization image in which sound image points of each frequency component corresponding to the point of interest on the first time axis in the acoustic signal are displayed in parallel on a display device, the first frequency axis A frequency / time designation area defined by an upper target band and a target period on the first time axis is arranged in the first area in response to an instruction to the receiving means, and the acoustic signal within the target period Display control means for arranging a target designation area defined by the target band on the second frequency axis and the target localization area on the localization axis in the second area in response to an instruction to the reception means;
A sound processing apparatus comprising: a signal processing unit that suppresses or emphasizes each frequency component indicated by a sound image point in the target designated region of the sound signal within the target period. The display control means arranges a plurality of target designation areas having different target bands or target localization areas in the second area in accordance with an instruction to the reception means, and each target designation area is arranged in each target designation area. The sound processing device according to claim 1, wherein a plurality of corresponding frequency / time designation regions are arranged so as to overlap in the first region. 3. The sound according to claim 1, wherein the display control unit sets a plurality of the frequency / time designation areas corresponding to the target designation area at different time points on the first time axis in the first area. Processing equipment. The display control means arranges spectrograms of each of the first channel signal and the second channel signal constituting the acoustic signal in the first region, and the display control unit performs the spectrogram according to the position of the target designation region on the localization axis. The acoustic processing device according to any one of claims 1 to 3, wherein the spectrogram of the first channel signal and the spectrogram of the second channel signal are changed to different display modes. The display control means includes a waveform image in which a waveform of an acoustic signal before or after processing by the signal processing means is arranged in a third region in which a second time axis is set, together with the frequency characteristic image and the localization image. The sound processing device according to claim 1, wherein the sound processing device is displayed on the display device.

Images