JP5915249B2 - Sound processing apparatus and sound processing method - Google Patents

Description

  The present invention relates to a technique for mixing down sound signals of a plurality of tracks.

  In music production scenes using DAW (Digital Audio Workstation), the acoustic characteristics and localization direction of the acoustic signals of multiple tracks recorded individually are adjusted, and two left and right channel acoustic signals are generated (mixed down). Is done. Considering that it is generally difficult to optimize the acoustic characteristics and localization direction of each track, for example, Non-Patent Document 1 discloses that each track has a sound volume equivalent to the listener's perception. A technique for automatically setting the gain of an equalizer is disclosed.

E.P. Gonzalez and J. Reiss, "Automatic equalization of multi-channel audio using cross-adaptive methods", 127th Audio Engineering Society Convention, October, 2009

  However, only by adjusting the volume of each track described in Non-Patent Document 1, actually, for example, a desired characteristic such that a singing sound track is clearly perceived by a listener among a plurality of tracks constituting a singing song. It is difficult to realize. Therefore, it is necessary for the producer to manually adjust the acoustic characteristics and the localization direction of each track, and there is a problem that the work load is large. In view of the above circumstances, an object of the present invention is to reduce the work load when mixing down the acoustic signals of a plurality of tracks.

  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.

  The acoustic processing apparatus of the present invention is a localization analysis unit that analyzes a localization direction (for example, a localization direction θx [k, n]) for each of a plurality of track acoustic signals (for example, acoustic signals X [1] to X [N]). For example, a localization analysis unit 42), an acoustic processing unit (for example, an acoustic processing unit 32) that executes adjustment processing for adjusting the acoustic characteristics of the acoustic signal and the localization direction analyzed by the localization analysis unit for each track, and after the adjustment processing Signal synthesizing means (for example, the signal synthesizing unit 34) for synthesizing the acoustic signals (for example, the acoustic signals Y [1] to Y [N]) of each track, and the priority (for example, the priorities P [1] to P [ N]) to set priority (for example, the priority setting unit 46) and the acoustic processing so that the acoustic signal of the high priority track is clarified compared to the acoustic signal of the low priority track. Control means for controlling the adjustment process for each track by the means (for example, It comprises a control unit 48) and. In the above configuration, the adjustment is performed to adjust the acoustic characteristics (for example, intensity) and the localization direction of the acoustic signal so that the acoustic signal of the high priority track is clarified in comparison with the acoustic signal of the low priority track. Since the process is controlled, the work burden when mixing down the sound signals of a plurality of tracks is reduced.

  In a preferred aspect of the present invention, the adjustment process includes a localization adjustment process for adjusting the localization direction of the acoustic signal, and the control means is configured such that the localization direction of the low priority track is separated from the localization direction of the high priority track. Thus, the localization adjustment process of each track is controlled. In the above aspect, the localization adjustment process of each track is controlled so that the localization direction of the low priority track is separated from the localization direction of the high priority track. It is possible to clarify in comparison with

  In a preferred aspect of the present invention, the adjustment process includes an intensity adjustment process for adjusting the intensity of the acoustic signal, and the control means suppresses the intensity of the low priority track with respect to the intensity of the high priority track. As described above, the intensity adjustment processing of each track is controlled. In the above aspect, since the strength of the low priority track is suppressed with respect to the strength of the high priority track, it is possible to clarify the high priority track. In addition, the control means controls the intensity adjustment processing of each track so that each frequency component in a band overlapping with the high-priority track acoustic signal among the low-priority track acoustic signals is suppressed. According to this, the effect of clarifying the high-priority track is particularly remarkable.

  In a preferred aspect of the present invention, the adjustment process includes an effect imparting process for the acoustic signal, and the control unit controls the degree of effect imparting by the effect imparting process for each track. For example, in the configuration in which the effect imparting process includes an emphasizing process for emphasizing an acoustic signal, the control unit controls the emphasizing process of each track so that a high priority track is emphasized compared to a low priority track. . According to the above aspect, it is possible to clarify a track having a high priority. In addition, in the configuration in which the effect adding process includes a reverberation adding process for adding a reverberation effect to an acoustic signal, control is performed so that the degree of reverberation adding to a low priority track exceeds the degree of reverberation adding to a high priority track. Means control the reverberation addition process for each track. According to the above aspect, it is possible to clarify the sense of localization of a high priority track.

  The acoustic processing device according to a preferred aspect of the present invention provides an acoustic processing device for each acoustic signal in a localization-frequency plane in which a localization axis indicating the localization direction of each frequency component of the acoustic signal and a frequency axis indicating the frequency of each frequency component are set. A means for displaying a sound image distribution image indicating a distribution of frequency components on a display device, the first sound image distribution image (for example, the first sound image distribution image Gx) of the acoustic signal of each track before the adjustment processing by the acoustic processing means; Display control means for displaying the second sound image distribution image (for example, the second sound image distribution image Gy) of the sound signal of each track after the adjustment processing by the sound processing means in a comparable manner. In the above aspect, by comparing the first sound image distribution image of each track before the adjustment process with the second sound image distribution image of each track after the adjustment process, the user can visually and effectively understand the effect of the adjustment process. There is an advantage that it can be evaluated intuitively.

  The sound processing apparatus according to each of the above aspects is realized by hardware (electronic circuit) such as a DSP (Digital Signal Processor) dedicated to processing of an acoustic signal, or a general-purpose operation such as a CPU (Central Processing Unit). This is also realized by cooperation between the processing device and the program. The program of the present invention includes a localization analysis process for analyzing the localization direction for each of the acoustic signals of a plurality of tracks, an adjustment process for each track that adjusts the acoustic characteristics of the acoustic signal and the localization direction analyzed by the localization analysis process, and an adjustment The signal synthesis process that synthesizes the acoustic signals of each track after processing, the priority setting process that sets the priority of each track, and the acoustic signal of the track with higher priority is compared with the acoustic signal of the track with lower priority. Therefore, the control process for controlling the adjustment process for each track is executed by the computer. According to the above program, the same operation and effect as the sound processing apparatus of the present invention are exhibited. The program of the present invention is provided in a form stored in a computer-readable recording medium and installed in the computer, or is provided in a form distributed via a communication network and installed in the computer.

1 is a block diagram of a sound processing apparatus according to one embodiment of the present invention. It is a schematic diagram of an analysis result image. It is explanatory drawing of the relationship between adjustment processing and a priority.

<Embodiment>
FIG. 1 is a block diagram of a sound processing apparatus 100 according to one embodiment of the present invention. As shown in FIG. 1, a signal supply device 200 is connected to the sound processing device 100. The signal supply device 200 supplies acoustic signals X [1] to X [N] of N tracks (N is a natural number of 2 or more) recorded individually to the acoustic processing device 100. One track means a system as a processing unit (for example, a combination of a plurality of sound systems or a single system sound). Each acoustic signal X [n] (n = 1 to N) of the first embodiment is recorded or processed (for example, intensity difference between the left and right channels) so that the sound image is localized in a specific direction with respect to the listener of the reproduced sound. Or a stereo signal composed of a left channel acoustic signal XL [n] and a right channel acoustic signal XR [n]. However, a combination of two channels arbitrarily selected by a user from a plurality of monaural channels can be handled as one track (stereo track). For example, a reproduction apparatus that acquires each acoustic signal X [n] from a portable or built-in recording medium and supplies the acoustic signal X [n] to the acoustic processing apparatus 100, or each acoustic signal X [n] generated by a sound collection device in real time. An input device that acquires and supplies the signal to the sound processing device 100 can be suitably employed as the signal supply device 200.

  The sound processing apparatus 100 is a signal processing apparatus that generates the sound signal Z by automatically mixing down the N-track sound signals X [1] to X [N]. The acoustic signal Z is a stereo signal composed of a left channel acoustic signal ZL and a right channel acoustic signal ZR. As illustrated in FIG. 1, the sound processing device 100 includes an arithmetic processing device 12, a storage device 14, a display device 22, an input device 24, and a sound emitting device 26. The display device 22 (for example, a liquid crystal display panel) displays various images in accordance with instructions from the arithmetic processing device 12. The input device 24 is a device that receives an instruction from the user to the sound processing device 100, and includes, for example, a plurality of operators operated by the user. The sound emitting device 26 (for example, a stereo speaker) reproduces a sound wave corresponding to the acoustic signal Z.

  The storage device 14 stores programs executed by the arithmetic processing device 12 and various types of information 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. A configuration in which each acoustic signal X [n] is stored in the storage device 14 (therefore, the signal supply device 200 is omitted) may also be employed.

  The arithmetic processing unit 12 executes a program stored in the storage device 14 to thereby generate a plurality of functions (acoustic processing unit) for generating the acoustic signal Z from the N-track acoustic signals X [1] to X [N]. 32, a signal synthesis unit 34, a localization analysis unit 42, a display control unit 44, a priority setting unit 46, and a control unit 48). A configuration in which each function of the arithmetic processing device 12 is distributed to a plurality of devices, or a configuration in which a dedicated electronic circuit (DSP) realizes a part of the functions of the arithmetic processing device 12 may be employed.

  The acoustic processing unit 32 is an element that generates N-track acoustic signals Y [1] to Y [N] by predetermined signal processing (hereinafter referred to as “adjustment processing”) for the acoustic signals X [1] to X [N]. There are N unit processing units U [1] to U [N] corresponding to different tracks. The unit processing unit U [n] corresponding to the nth track generates the acoustic signal Y [n] by adjusting the acoustic signal X [n]. Each acoustic signal Y [n] is a stereo signal composed of a left channel acoustic signal YL [n] and a right channel acoustic signal YR [n].

  The adjustment process executed by each unit processing unit U [n] includes a localization adjustment process, an intensity adjustment process, and an effect applying process. The localization adjustment process is a process for adjusting the direction in which the sound image of the acoustic signal X [n] is localized (hereinafter referred to as “localization direction”) (for example, the intensity difference or phase difference between the acoustic signal XL [n] and the acoustic signal XR [n]). Is a process for controlling the above. The intensity adjustment process is a process for adjusting the intensity (amplitude) of the acoustic signal X [n]. In the present embodiment, an equalizing process for individually adjusting the intensity (amplitude) of each frequency component of the acoustic signal X [n] is exemplified as the intensity adjustment process. The effect imparting process is a process for imparting various acoustic effects to the acoustic signal X [n]. In the present embodiment, addition of a reverberation effect (reverberation addition processing) to the acoustic signal X [n] and enhancement processing of the acoustic signal X [n] (for example, a dynamics effect such as a compressor) are exemplified as the effect imparting processing. The intensity adjustment process and the effect applying process can also be referred to as a process for controlling the acoustic characteristics of the acoustic signal X [n].

  The signal synthesis unit 34 synthesizes the acoustic signal Z by synthesizing the N track acoustic signals Y [1] to Y [N] generated by the adjustment processing by the acoustic processing unit 32 (each unit processing unit U [n]). Generate. The signal synthesis unit 34 of the present embodiment is an adder that adds the acoustic signals Y [1] to Y [N]. Specifically, the left channel acoustic signal ZL is generated by adding the left channel acoustic signals YL [1] to YL [N] of each track, and the right channel acoustic signals YR [1] to YR [ N] is added to generate the right channel acoustic signal ZR. The acoustic signal Z generated by the signal synthesis unit 34 is reproduced from the sound emitting device 26.

  The localization analysis unit 42 calculates the localization direction θ [k, n] (θx [k, n], θy [k, n]) for each frequency for each of the N tracks. The symbol k means any one frequency on the frequency axis. The localization analysis unit 42 of the present embodiment includes the localization direction θx [k, n] of each acoustic signal X [n] before execution of the adjustment processing by the acoustic processing unit 32 and each acoustic signal Y [after execution of the adjustment processing. The localization direction θy [k, n] of n] is calculated.

A known technique can be arbitrarily used to calculate the localization direction θ [k, n]. For example, the intensity ML [k] of each frequency of the acoustic signal XL [n] of the left channel and the intensity MR [k] of each frequency of the acoustic signal XR [n] of the right channel among the acoustic signals X [n] are used. The localization direction θx [k, n] of the acoustic signal X [n] is calculated by the calculation of the following formula (1). Similarly, in the localization direction θy [k, n] of the acoustic signal Y [n], the intensity ML [k] of the left channel acoustic signal YL [n] and the intensity MR [k] of the right channel acoustic signal YR [n]. ] Is applied to Equation (1). The formula (1) is also described in detail in, for example, M. Vinyes, J. Bonada, A. Loscos, “Demixing Commercial Music Productions via Human-Assisted Time-Frequency Masking”, Audio Engineering Society 120th Convention, France, 2006. It is stated.

  The display control unit 44 causes the display device 22 to display the analysis result image G of FIG. 2 representing the analysis result by the localization analysis unit 42. The analysis result image G includes a first sound image distribution image Gx and a second sound image distribution image Gy that are juxtaposed so that the user can compare the two.

  As shown in FIG. 2, each of the first sound image distribution image Gx and the second sound image distribution image Gy has a localization-frequency plane in which a localization axis AP indicating a localization direction and a frequency axis AF indicating a frequency are set. It is an image expressing the distribution of each frequency component. In the localization-frequency plane of the first sound image distribution image Gx, a plurality of sound image figures Q representing the respective frequency components of the sound signal X [n] are arranged in parallel for the N-track sound signals X [1] to X [N]. Placed in. The sound image figure Q corresponding to each frequency component of the acoustic signal X [n] has a localization direction θx [calculated by the localization analysis unit 42 for the frequency component of the frequency axis AF and the frequency component of the localization axis AP. k, n]. Therefore, a plurality of sound image figures Q corresponding to the acoustic signal X [n] of one track are roughly distributed along the frequency axis AF as shown in FIG. Similar to the first sound image distribution image Gx, in the localization-frequency plane of the second sound image distribution image Gy, there are a plurality of sound image figures Q representing the respective frequency components of the acoustic signal Y [n] after execution of the adjustment process. N-track acoustic signals Y [1] to Y [N] are arranged in parallel. The plurality of sound image figures Q corresponding to the acoustic signal Y [n] of one track are roughly distributed in a long shape along the frequency axis AF. Evaluation of the relationship between the frequency of each N track and the localization direction (that is, the effect of the adjustment process) before and after the execution of the adjustment process (first sound image distribution image Gx) and after the execution (second sound image distribution image Gy) Is possible.

  The priority setting unit 46 in FIG. 1 variably sets the priority P [n] (P [1] to P [N]) for each of the N tracks. The priority setting unit 46 of the present embodiment sets the priority P [n] of each track in accordance with an instruction from the user to the input device 24. For example, by appropriately operating the input device 24, the user can select the sound image figure Q of a desired track from the first sound image distribution image Gx and indicate the priority P [n] of the track. Is possible.

  The control unit 48 uses the acoustic processing unit 32 according to the localization direction θx [k, n] calculated for each track by the localization analysis unit 42 and the priority P [n] set for each track by the priority setting unit 46. Controls the adjustment process (localization adjustment process, strength adjustment process, effect applying process). After completing the calculation of the localization direction θx [k, n] by the localization analysis unit 42 and the setting of each priority P [n] by the priority setting unit 46, a predetermined operation (for example, the start of automatic adjustment) is performed on the input device 24. The control of the adjustment process by the control unit 48 is started when the operator presses the instruction).

  For example, paying attention to the acoustic signal X [n1] of the n1st (n1 = 1 to N) track and the acoustic signal X [n2] of the n2th (n2 = 1 to N, n2 ≠ n1) track, Assuming that the priority P [n1] of the acoustic signal X [n1] exceeds the priority P [n2] of the acoustic signal X [n2] (P [n1]> P [n2]), the control unit 48 The acoustic signal X [n1] with high priority P [n1] is clarified (increased audible intelligibility) compared to the acoustic signal X [n2] with low priority P [n2]. The adjustment processing of each track by the sound processing unit 32 is controlled. In the following description, details of specific control for each of the adjustment processing (localization adjustment processing, intensity adjustment processing, and effect application processing) will be described in detail with reference to FIG. 3 illustrating the first sound image distribution image Gx. .

<Localization adjustment processing>
In the control unit 48, the lower the priority P [n] of the N tracks, the more the amount of change from the initial localization direction θx [k, n] calculated by the localization analysis unit 42 for the acoustic signal X [n] is. The localization adjustment process for each of the N tracks is controlled so as to increase. Specifically, the localization direction θx [k, n2] of the track with priority P [n2] is the localization direction θx [k, k of the track with priority P [n1] (P [n1]> P [n2]). The localization adjustment process of each track is controlled so as to be separated from n1].

  For example, as shown in FIG. 3, the localization direction θx [k, 2] of the acoustic signal X [2] and the localization direction θx [k, 3] of the acoustic signal X [3] are the localization directions of the acoustic signal X [1]. Located on the left side of θx [k, 1], the localization direction θx [k, 4] of the acoustic signal X [4] and the localization direction θx [k, 5] of the acoustic signal X [5] are the acoustic signal X [1. ] Is assumed to be located on the right side of the localization direction θx [k, 1] (N = 5). When the priority P [1] of the acoustic signal X [1] is the maximum, as indicated by an arrow in FIG. 3, the localization direction θx [k, 2] of the acoustic signal X [2] and the acoustic signal X [3] Is moved to the left with respect to the localization direction θx [k, 3], and the localization direction θx [k, 4] of the acoustic signal X [4] and the localization direction θx [k, 5] of the acoustic signal X [5] are on the right side. Move to.

  When the priority P [3] of the acoustic signal X [3] is lower than the priority P [2] of the acoustic signal X [2] (P [3] <P [2]), the acoustic signal X [3] The amount of change Δθ [3] in the localization direction θx [k, 3] (difference between the localization direction θx [k, 3] before processing and the localization direction θy [k, 3] after processing) is the acoustic signal X [2 ] In the localization direction θx [k, 2]. Similarly, when the priority P [5] of the acoustic signal X [5] is lower than the priority P [4] of the acoustic signal X [4] (P [5] <P [4]), the acoustic signal X [ The change amount Δθ [5] in the localization direction θx [k, 5] of 5] exceeds the change amount Δθ [4] in the localization direction θx [k, 4] of the acoustic signal X [4]. Therefore, the listener of the reproduced sound of the acoustic signal Z can clearly perceive the sound image of the acoustic signal X [n] having a high priority P [n].

<Strength adjustment processing>
The control unit 48 controls the intensity adjustment processing for each of the N tracks so that the intensity (intensity over the entire band) is reduced as the acoustic signal X [n] of the track having the lower priority P [n] among the N tracks. . Specifically, the sound signal X [n1] of the track having the priority P [n1] (P [n1]> P [n2]) is selected as the intensity of the sound signal X [n2] of the track having the priority P [n2]. It is suppressed against the strength of. In addition, the control unit 48 decreases the intensity of each frequency component in a band overlapping with a main distribution band (for example, a band whose intensity exceeds a predetermined value) of the acoustic signal X [n1] in the acoustic signal X [n2]. Thus, the intensity adjustment process of each track is controlled.

  For example, in the situation illustrated in FIG. 3 (P [1]> P [2]> P [3], P [1]> P [4]> P [5]), the entire acoustic signal X [2] Each frequency component in the band B [2] in which the intensity over the band is suppressed compared to the acoustic signal X [1] and the acoustic signal X [2] overlaps the acoustic signal X [1] on the frequency axis. Is suppressed in comparison with other bands. Further, the intensity of the acoustic signal X [3] over the entire band is suppressed as compared with the acoustic signal X [2], and the band B [3] overlapping the acoustic signal X [2] of the acoustic signal X [3]. The intensity of each frequency component is suppressed as compared with other bands. The same applies to the acoustic signal X [4] and the acoustic signal X [5]. Therefore, the listener of the reproduced sound of the acoustic signal Z can clearly hear the sound of the acoustic signal X [n] having a high priority P [n] with high intensity.

<Effect application processing>
The control unit 48 performs an effect imparting process (reverberation adding process, emphasizing process) on each of the N tracks so that the acoustic signal X [n] is clarified as the priority P [n] of the N tracks is higher. Control. That is, when attention is paid to the acoustic signal X [n1] of the priority P [n1] and the acoustic signal X [n2] of the priority P [n2] (P [n1]> P [n2]), the acoustic signal X [n1 ] Is controlled to be clarified in comparison with the acoustic signal X [n2].

  For example, in the situation illustrated in FIG. 3 (P [1]> P [2]> P [3], P [1]> P [4]> P [5]), the acoustic signal X [1] is acoustic. The degree of emphasis processing (dynamic effects) in the effect imparting process so that the signal X [2] is emphasized compared to the signal X [2] and the sound signal X [2] is emphasized compared to the sound signal X [3]. The control unit 48 controls. Similarly, the acoustic signal X [1] is enhanced compared to the acoustic signal X [4], and the acoustic signal X [4] is enhanced compared to the acoustic signal X [5].

  Also, the degree of reverberation effect (reverberation time) added to the acoustic signal X [2] exceeds the degree of reverberation effect added to the acoustic signal X [1], and the reverberation effect added to the acoustic signal X [3]. The control unit 48 controls the degree of reverberation added by the reverberation adding process in the effect applying process so that the degree of reverberation exceeds the degree of the reverberating effect added to the acoustic signal X [2]. Similarly, the degree of the reverberation effect added to the acoustic signal X [4] exceeds the degree of the reverberation effect added to the acoustic signal X [1], and the degree of the reverberation effect added to the acoustic signal X [5] It exceeds the degree of reverberation effect added to the acoustic signal X [4]. Therefore, the acoustic signal X [n] with the lower priority P [n] is added with a deeper reverberation effect to reduce the localization (ambiguity), and the localization of the acoustic signal X [n] with the higher priority P [n]. The feeling is relatively clarified.

  The user appropriately operates the input device 24 after executing the adjustment process controlled by the method exemplified above (for example, the sound image figure Q of a desired track in the first sound image distribution image Gx is set in the direction of the localization axis AP. It is possible to change the localization direction θx [n] of each track. Each time the localization direction θx [n] of a specific track is changed, the control unit 48 executes the control of the adjustment process exemplified above.

  In the embodiment exemplified above, the acoustic signal X [n] of the track having the higher priority P [n] is clarified as compared with the acoustic signal X [n] of the track having the lower priority P [n]. In addition, the adjustment process for the acoustic signal X [n] is controlled for each track. Specifically, the localization adjustment process for adjusting the localization direction θx [k, n] analyzed by the localization analysis unit 42, the intensity adjustment process for adjusting the acoustic characteristics (intensity, etc.) of the acoustic signal X [n], and the application of the effect Processing is controlled for each track. According to the above configuration, the N-track acoustic signals X [1] to X [N] are adjusted to have a relationship suitable for mixdown as compared with the technique of Non-Patent Document 1 in which only the volume of each track is adjusted. Therefore, it is possible to reduce the work burden when mixing down the N-track acoustic signals X [1] to X [N].

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

(1) The content of the adjustment process by the acoustic processing unit 32 is not limited to the above examples. For example, dynamic effects such as distortion and overdrive can be executed as adjustment processing (effect application processing). Moreover, although the adjustment process in a time domain was illustrated in the above illustration, the adjustment process in a frequency domain can also be performed.

(2) In the above-described embodiment, the first sound image distribution image Gx and the second sound image distribution image Gy are juxtaposed, but the method for displaying the first sound image distribution image Gx and the second sound image distribution image Gy so as to be comparable is as described above. It is not limited to the illustration. For example, a configuration in which one of the first sound image distribution image Gx and the second sound image distribution image Gy is disposed as a transparent image on the other front surface, or each of the first sound image distribution image Gx and the second sound image distribution image Gy is sometimes used. A configuration of displaying in a divided manner (for example, switching from one to the other each time the input device 24 is operated) may be employed.

(3) In the above-described embodiment, the reverberation effect is added to all the acoustic signals X [1] to X [N] of the N tracks, but the acoustic signal X [n] (for example, the priority is low) with the low priority P [n]. A reverberation effect is added to only a predetermined number of acoustic signals X [n] positioned in descending order of P [n] and acoustic signals X [n] whose priority P [n] is lower than the threshold, and the priority is added. A configuration in which no reverberation effect is added to the remaining acoustic signal X [n] having a high P [n] may be employed.

(4) In the above-described embodiment, the priority P [n] is set for each of the N tracks, but a configuration in which only less than N tracks to be prioritized among N tracks are specified (for a predetermined number of tracks). A configuration in which a higher priority P [n] than the remaining tracks is set may be employed.

(5) A configuration in which the localization direction θx [k, n] of each track can be changed in accordance with an instruction from the user may be employed. For example, the localization direction θx [k, n2] of the acoustic signal X [n2] with the priority P [n2] is the acoustic signal X [n1] with the priority P [n1] (P [n1]> P [n2]). When the sound signal approaches the localization direction θx [k, n1], the sense of localization of the acoustic signal X [n1] is reduced. Therefore, the change range of the localization direction θx [k, n2] of the acoustic signal X [n2] is a predetermined range including the localization direction θx [k, n1] of the acoustic signal X [n1] (hereinafter referred to as “prohibited range”). A configuration in which the localization direction θx [k, n2] is not excessively close to the localization direction θx [k, n1] is preferable. For example, when the localization direction θx [k, n2] after the change instructed by the user is located within the prohibited range, the configuration is returned to the position before the change, or the localization direction θx [k, k to avoid the prohibited range A configuration in which n2] is changed is preferable.

(6) The content of the localization adjustment process for adjusting the localization direction θx [k, n] of each track is not limited to the above examples. For example, when the user changes the localization direction θx [k, n] of each track so that the interval between each localization direction θx [k, n] of two different tracks exceeds a predetermined value, the localization of a specific track A configuration is adopted in which the direction θx [k, n] is changed within the interval. For example, when the interval of the localization direction θx [k, n] of each track having a low priority P [n] is expanded, the localization direction θx [k, n] of a track having a high priority P [n] is automatically set. Within that interval. According to the above configuration, there is an advantage that the localization feeling of a track having a high priority P [n] can be clearly clarified.

DESCRIPTION OF SYMBOLS 100 ... Sound processing device, 200 ... Signal supply device, 12 ... Arithmetic processing device, 14 ... Memory | storage device, 22 ... Display device, 24 ... Input device, 26 ... Sound emission device, 32 ... Sound Processing unit 34... Signal synthesis unit 42 .. Localization analysis unit 44... Display control unit 46... Priority setting unit 48 .. Control unit G. Analysis result image Gx. Sound image distribution image, Gy: second sound image distribution image.

Claims (6)

A localization analysis means for analyzing a localization direction for each of the acoustic signals of a plurality of tracks;
Acoustic processing means for performing, for each track, adjustment processing for adjusting the acoustic characteristics of the acoustic signal and the localization direction analyzed by the localization analysis means;
And priority setting means for setting the priority of each track,
Control means for controlling the adjustment processing for each track by the sound processing means so that the sound signal of the high priority track is clarified in comparison with the sound signal of the low priority track ;
A sound processing apparatus comprising: signal combining means for combining the sound signals of the tracks after the adjustment processing . The adjustment process includes a localization adjustment process for adjusting the localization direction of the acoustic signal,
The sound processing apparatus according to claim 1, wherein the control unit controls localization adjustment processing of each track so that a localization direction of the low priority track is separated from a localization direction of the high priority track. The adjustment process includes an intensity adjustment process for adjusting the intensity of each frequency component of the acoustic signal,
The control means controls the intensity adjustment processing of each track so that each frequency component in a band overlapping with an acoustic signal of a high priority track among acoustic signals of a low priority track is suppressed. The sound processing apparatus according to claim 1 or 2. The adjustment process includes an enhancement process for enhancing the acoustic signal,
The sound processing device according to any one of claims 1 to 3, wherein the control unit controls the enhancement processing of each track so that a high priority track is enhanced as compared with a low priority track. The adjustment process includes a reverberation adding process for adding a reverberation effect to the acoustic signal,
The control unit controls reverberation addition processing of each track so that the degree of reverberation addition to a low priority track exceeds the degree of reverberation addition to a high priority track. Sound processing device.   Computer
  Analyzing the localization direction for each of the multi-track acoustic signals,
  An adjustment process for adjusting the acoustic characteristics of the acoustic signal and the analyzed localization direction is performed for each track,
  Set the priority of each track,
  Controlling the adjustment process for each track so that the acoustic signal of the high priority track is clarified compared to the acoustic signal of the low priority track;
  Synthesize the acoustic signal of each track after the adjustment process
  Sound processing method.

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