JP2018116153A - Acoustic effect application device, acoustic effect application method and acoustic effect application program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic effect application device, an acoustic effect application method and an acoustic effect application program capable of controlling the acoustic effect of a stereo acoustic signal variously and easily.SOLUTION: An M/S converter 110 converts a stereo acoustic signal AS1 into a sum signal MS1 and a difference signal SS1. An effect application unit 120M applies the acoustic effect to the sum signal MS1 and an effect application unit 120S applies the acoustic effect to the difference signal SS1. An M/S re-converting unit 150 converts a sum signal MS2 and a difference signal SS2 to which the acoustic effects are applied into a stereo acoustic signal AS2. A first control unit 160 controls the properties of the sound effects of the effect application units 120M and 120S on the basis of a value of a first operation parameter OP1. A second control unit 170 controls the degree of the acoustic effect of the effect application unit 120S on the basis of a value of a second operation parameter OP2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an acoustic effect imparting device that imparts an acoustic effect to a stereo acoustic signal, an acoustic effect imparting method, and an acoustic effect imparting program.

  M / S (Mid / Side) processing is known as a processing method for stereo sound signals. The stereo sound signal is composed of a right signal and a left signal. In the M / S processing, the right signal and the left signal are converted into a sum signal and a difference signal, and predetermined processing is performed on the sum signal and the difference signal, respectively. The processed sum signal and difference signal are converted into a stereo sound signal. Thereby, the spread of the stereo sound image by the stereo sound signal can be adjusted.

  For example, Patent Document 1 describes a sound image enhancement device. In the sound image enhancement device of Patent Document 1, a sum signal and a difference signal are generated from a stereo signal. Correction is performed so that the magnitude of the sum signal is changed and the low frequency band of the difference signal is delayed. The modified sum and difference signals are reconstructed into a composite acoustic signal.

U.S. Pat. No. 4,356,349

  According to the sound image enhancement device described in Patent Document 1, it is possible to obtain a sound spread. However, various sound effects cannot be imparted to the stereo sound signal. In order to variously adjust the sound effect imparted to the stereo sound signal in the apparatus using the M / S processing, values of a large number of parameters are respectively set in the circuits that impart the sound effect to the sum signal and the difference signal. Is required. Therefore, it is difficult to variously adjust the sound effect of the stereo sound signal.

  The objective of this invention is providing the acoustic effect provision apparatus, the acoustic effect provision method, and the acoustic effect provision program which can adjust the acoustic effect of a stereo sound signal variously and easily.

  The acoustic effect imparting apparatus according to the present invention includes a first conversion unit that converts a stereo acoustic signal into a sum signal and a difference signal, a first acoustic effect imparting unit that imparts a first acoustic effect to the sum signal, and a difference. A second acoustic effect imparting means for imparting a second acoustic effect to the signal, and a second signal for converting the sum signal after the provision of the first acoustic effect and the difference signal after the provision of the second acoustic effect into a stereo acoustic signal. A first conversion unit that obtains a value of the first operation parameter and a property of the first acoustic effect and a property of the second acoustic effect based on the acquired value of the first operation parameter; And second control means for acquiring a value of the second operation parameter and controlling the degree of the first acoustic effect and the degree of the second acoustic effect based on the acquired value of the second operation parameter. With.

  According to the acoustic effect imparting device, the properties of the first and second acoustic effects imparted to the sum signal and the difference signal, respectively, are controlled by the user adjusting the value of the first operation parameter. Further, the degree of the first and second acoustic effects given to the sum signal and the difference signal is controlled by the user adjusting the value of the second operation parameter. In this case, the acoustic effects of the central component and the components on both sides of the sound image by the stereo acoustic signal are adjusted. Accordingly, it is possible to easily and easily adjust the acoustic effect of the stereo sound signal.

  The first control means acquires a correspondence relationship between a predetermined number of values of the first operation parameter and a predetermined number of values representing the nature of the sound effect as first correspondence information, and the first control parameter A value representing a property corresponding to an arbitrary value may be generated by interpolation of the first correspondence information, and the property of the first acoustic effect and the property of the second acoustic effect may be controlled based on the generated value. In this case, the data amount of the first correspondence information can be reduced.

  The second control means acquires a correspondence relationship between the predetermined number of values of the second operation parameter and the predetermined number of values representing the degree of the sound effect as the second correspondence information, and the second control parameter A value representing a degree corresponding to an arbitrary value may be generated by interpolation of the second correspondence information, and the degree of the first acoustic effect and the degree of the second acoustic effect may be controlled based on the generated value. In this case, the data amount of the second correspondence information can be reduced.

  The first acoustic effect imparting means includes a first generation unit that generates a sum signal to which the first acoustic effect is imparted, a first path that transmits the sum signal to which the first acoustic effect is imparted, A second path for transmitting a sum signal to which the first acoustic effect is not applied, and a first synthesis unit for synthesizing the sum signal of the first path and the sum signal of the second path. The acoustic effect imparting means includes a second generation unit that generates a difference signal to which the second acoustic effect is imparted, a third path for transmitting the difference signal to which the second acoustic effect is imparted, A fourth path for transmitting a difference signal to which no acoustic effect is imparted, and a second synthesis unit for synthesizing the difference signal of the third path and the difference signal of the fourth path, and the second control means includes Controlling the degree of the first acoustic effect by controlling the volume of the sum signal of the first and second paths, respectively, It may control the extent of the second acoustic effect by controlling the volume of the difference signal of the road respectively. In this case, the degree of the first and second acoustic effects can be controlled with a simple configuration.

  The second control means may control the degree of the first acoustic effect by controlling the volume of the sum signal, and may control the degree of the second acoustic effect by controlling the volume of the difference signal. In this case, the degree of the first and second acoustic effects can be controlled with a simple configuration, and the ratio of the sum signal and the difference signal can be controlled.

  The acoustic effect imparting method according to the present invention includes a step of converting a stereo acoustic signal into a sum signal and a difference signal, a step of imparting a first acoustic effect to the sum signal, and a second acoustic effect of the difference signal. A step, a step of converting the sum signal after application of the first sound effect and a difference signal after application of the second sound effect into a stereo sound signal, and acquiring the value of the first operation parameter A step of controlling the property of the first acoustic effect and the property of the second acoustic effect based on the value of the first operation parameter, obtaining the value of the second operation parameter, and obtaining the value of the obtained second operation parameter And controlling the degree of the first acoustic effect and the degree of the second acoustic effect based on.

  The sound effect applying program according to the present invention includes a step of converting a stereo sound signal into a sum signal and a difference signal, a step of applying a first sound effect to the sum signal, and a second sound effect of the difference signal. A step, a step of converting the sum signal after application of the first sound effect and a difference signal after application of the second sound effect into a stereo sound signal, and acquiring the value of the first operation parameter A step of controlling the property of the first acoustic effect and the property of the second acoustic effect based on the value of the first operation parameter, obtaining the value of the second operation parameter, and obtaining the value of the obtained second operation parameter And controlling the degree of the first acoustic effect and the degree of the second acoustic effect based on the above.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to adjust the acoustic effect of a stereo sound signal variously and easily.

It is a block diagram which shows the structure of the electronic musical instrument containing the acoustic effect provision apparatus which concerns on one embodiment of this invention. It is a block diagram which shows the structure of the acoustic effect provision apparatus of FIG. It is a figure which shows the example of the value of the internal parameter corresponding to the value of the 1st and 2nd operation parameter. It is a flowchart which shows the acoustic effect provision process in the acoustic effect provision apparatus of FIG. It is a flowchart which shows the acoustic effect provision process in the acoustic effect provision apparatus of FIG.

  Hereinafter, a sound effect imparting device, a sound effect imparting method, and a sound effect imparting program according to embodiments of the present invention will be described in detail with reference to the drawings.

(1) Configuration of Electronic Musical Instrument FIG. 1 is a block diagram showing a configuration of an electronic musical instrument including a sound effect imparting device according to an embodiment of the present invention.

  As shown in FIG. 1, the electronic musical instrument 1 includes a performance operator 2, a setting operator 3, and a display 4. The performance operator 2 includes, for example, a keyboard and is connected to the bus 14. Performance data based on the performance operation of the user is input by the performance operator 2. The setting operator 3 includes an operation switch that is turned on / off, an operation switch that is rotated, or an operation switch that is slid, and is connected to the bus 14. The setting operator 3 is used for adjusting operation parameters, adjusting volume, turning on / off the power source, and performing various settings. The display 4 is connected to the bus 14. The display 4 displays a song title, a sound effect parameter value, a score, or other various information. The display device 4 may be a touch panel display. In this case, part or all of the performance operator 2 or the setting operator 3 may be displayed on the display 4. The user can instruct various operations by operating the display 4.

  The electronic musical instrument 1 includes a signal processing unit 5 and a sound system 8. The signal processing unit 5 includes a sound source unit 6 and a sound effect applying device 100. The sound source unit 6 and the sound effect applying device 100 are connected to the bus 14. The sound source unit 6 is configured by a dedicated circuit, for example, and generates an acoustic signal (audio data) based on performance data input from the performance operator 2 or music data given from the storage device 12 described later. The acoustic signal includes a plurality of sampling values obtained by sampling a waveform signal representing a change in sound at a predetermined sampling period. Details of the configuration and operation of the acoustic effect applying apparatus 100 will be described later.

  The sound system 8 includes a digital analog (D / A) conversion circuit, an amplifier, and a speaker. The sound system 8 converts an acoustic signal supplied from the sound source unit 6 through the acoustic effect applying apparatus 100 into an analog sound signal, and generates a sound based on the analog sound signal.

  The electronic musical instrument 1 further includes a RAM (random access memory) 9, a ROM (read only memory) 10, a CPU (central processing unit) 11, a storage device 12, and a communication I / F (interface) 13. The RAM 9, ROM 10, CPU 11, storage device 12, and communication I / F 13 are connected to the bus 14. An external device such as an external storage device may be connected to the bus 14 via the communication I / F 13.

  The ROM 10 is composed of, for example, a non-volatile memory and stores a control program executed by the CPU 11. The RAM 9 is composed of, for example, a volatile memory, is used as a work area for the CPU 11, and temporarily stores various data. The CPU 11 executes a control program stored in the ROM 10 and gives various instructions to the sound effect applying apparatus 100 according to the operation of the setting operator 3. The CPU 11, ROM 10 and RAM 9 constitute a computer.

  The storage device 12 includes a storage medium such as a hard disk, an optical disk, a magnetic disk, or a memory card. The storage device 12 stores music data. The music data is an acoustic signal representing the music. Music data may be generated based on performance data input from the performance operator 2 and stored in the storage device 12.

(2) Sound effect imparting device 100
FIG. 2 is a block diagram showing the configuration of the acoustic effect applying apparatus 100 of FIG. 2 includes an M / S (Mid / Side) converting unit 110, effect applying units 120M and 120S, amplifiers 140M and 140S, and an M / S reconverting unit 150. The M / S converter 110 receives a stereo acoustic signal AS1 including a left signal L1 and a right signal R1. The M / S conversion unit 110 converts the stereo acoustic signal AS1 into a sum signal MS1 and a difference signal SS1. The sum signal MS1 is a center signal having a central component of the sound image represented by the stereo acoustic signal AS1. The difference signal SS1 is a side signal having left and right components of the sound image represented by the stereo acoustic signal AS1.

  The effect imparting unit 120M imparts an acoustic effect to the sum signal MS1, and the effect imparting unit 120S imparts an acoustic effect to the difference signal SS1. The acoustic effect is, for example, one type of distortion, equalizer, delay, reverb, or the like, or a combination of a plurality of types. The type of the acoustic effect by the effect imparting unit 120M and the type of the acoustic effect by the effect imparting unit 120S may be the same or different.

  The effect applying unit 120M includes an effect processing unit 121 and a level adjusting unit 122. The level adjustment unit 122 includes amplifiers 201 and 202 and an adder 203. Further, the effect imparting unit 120M has a dry route DR and a wet route WE. An amplifier 201 is provided in the dry path DR, and an effect processing unit 121 and an amplifier 202 are provided in the wet path WE. In the dry path DR, no acoustic effect is imparted to the sum signal MS1, and in the wet path WE, an acoustic effect is imparted to the sum signal MS1 by the effect processing unit 121. The output signal of the amplifier 201 in the dry path DR is a dry signal to which no acoustic effect is given. The output signal of the amplifier 202 in the wet path WE is a wet signal to which an acoustic effect is given. The adder 203 adds the output signal of the amplifier 201 and the output signal of the amplifier 202.

  The configuration and operation of the effect applying unit 120S are the same as the configuration and operation of the effect applying unit 120M. In the dry route DR of the effect applying unit 120S, no acoustic effect is applied to the difference signal SS1, and in the wet route WE, an acoustic effect is applied to the difference signal SS1 by the effect processing unit 121.

  The amplifier 140M amplifies the output signal of the effect applying unit 120M and outputs a sum signal MS2. The amplifier 140S amplifies the output signal of the effect applying unit 120S and outputs a difference signal SS2. The M / S re-conversion unit 150 converts the sum signal MS2 and the difference signal SS2 into a stereo acoustic signal AS2 composed of the left signal L2 and the right signal R2.

  A plurality of acoustic effect parameters are given to the effect applying units 120M and 120S and the amplifiers 140M and 140S.

  Hereinafter, the sound effect parameter is referred to as an internal parameter. The plurality of internal parameters include an internal parameter for adjusting the nature (characteristic, directionality, or texture) of the acoustic effect and an internal parameter for adjusting the degree (depth, degree, or degree of engagement) of the acoustic effect. . Examples of internal parameters for adjusting the nature of the acoustic effect include drive and tone in distortion. In the equalizer, there are a frequency, a queue (Q), a gain, and a type. Types include peaking, low shelving filter, high shelving filter, and high pass filter. In the delay, there are a delay time, a feedback level, a parameter related to the characteristics of the included equalizer, and the like. The parameters relating to the equalizer characteristics include a high pass filter and a low pass filter. Reverb types include Reverb Type, Reverb Time, Room Size, Pre Delay, Early Reflection, Tail, and Damping. It is done. In the present embodiment, the effect imparting unit 120M has internal parameters PM1 to PMn (n: integer of 2 or more) for adjusting the nature of the acoustic effect and internal parameters PM11 and PM12 for adjusting the degree of the acoustic effect. Given. Further, internal parameters PS1 to PSn for adjusting the nature of the acoustic effect and internal parameters PS11 and PS12 for adjusting the degree of the acoustic effect are given to the effect imparting unit 120S. The amplifiers 140M and 140S are given internal parameters PM13 and PS13 for adjusting the degree of the acoustic effect of the sum signal MS1 and the difference signal SS1, respectively. For example, internal parameters PM11 to PM13 and PS11 to PS13 for adjusting the degree of the acoustic effect are internal parameters related to gain. Thereby, the level (volume) of the sum signal MS1 or the difference signal SS1 is adjusted.

  In the present embodiment, at least a part of the types of internal parameters PM1 to PMn given to the effect applying unit 120M and the types of internal parameters PS1 to PSn given to the effect applying unit 120S are the same. For example, the internal parameters PM1 and PS1 may be the same type of internal parameter. Note that the types of internal parameters PM1 to PMn given to the effect imparting unit 120M and the types of internal parameters PS1 to PSn given to the effect imparting unit 120S may be different. The effect processing unit 121 of the effect applying unit 120M adjusts the nature of the acoustic effect based on the values of the internal parameters PM1 to PMn, and the effect processing unit 121 of the effect applying unit 120S is configured to adjust the acoustic effect based on the values of the internal parameters PS1 to PSn. To adjust the nature of.

  The level adjusting unit 122 of the effect applying unit 120M adjusts the degree of the acoustic effect based on the values of the internal parameters PM11 and PM12, and the level adjusting unit 122 of the effect applying unit 120S is based on the values of the internal parameters PS11 and PS12. Adjust the degree of. In this case, the level (volume) of the sum signal MS1 of the wet path WE of the effect applying unit 120M is adjusted based on the values of the internal parameters PM11 and PM12, and the wetness of the effect applying unit 120S is adjusted based on the values of the internal parameters PS11 and PS12. The level (volume) of the difference signal SS1 of the path WE is adjusted. Further, the gains of the amplifiers 140M and 140S are adjusted by the values of the internal parameters PM13 and PS13, respectively. In this case, the level (volume) of the sum signal MS2 is adjusted by the value of the internal parameter PM13, and the level (volume) of the difference signal SS2 is adjusted by the value of the internal parameter PS13.

  The acoustic effect imparting apparatus 100 further includes a first control unit 160, a second control unit 170, a first storage unit 180, and a second storage unit 190. The first controller 160 is given the value of the first operation parameter OP1 that is set or adjusted by the operation of the setting operator 3 in FIG. The second controller 170 is given the value of the second operation parameter OP2 set or adjusted by the operation of the setting operator 3 in FIG. The first operating parameter OP1 is used to adjust the nature of the acoustic effect. The second operation parameter OP2 is used for adjusting the degree of the acoustic effect.

  The values of the internal parameters PM1 to PMn and PS1 to PSn are determined by the value of the first operation parameter OP1. The first storage unit 180 stores a correspondence relationship between the value of the first operation parameter OP1 and the values of the internal parameters PM1 to PMn and PS1 to PSn as first correspondence information. In the present embodiment, a plurality of internal parameter sets ST11 to ST13 are stored in the first storage unit 180 as first correspondence information. The internal parameter set ST11 includes values of internal parameters PM1 to PMn and PS1 to PSn corresponding to the maximum value of the first operation parameter OP1. The internal parameter set ST12 includes values of internal parameters PM1 to PMn and PS1 to PSn corresponding to the midpoint value of the first operation parameter OP1. The internal parameter set ST13 includes values of internal parameters PM1 to PMn and PS1 to PSn corresponding to the minimum value of the first operation parameter OP1.

  The values of the internal parameters PM11 to PM13 and PS11 to PS13 are determined by the value of the second operation parameter OP2. The second storage unit 190 stores a correspondence relationship between the value of the second operation parameter OP2 and the values of the internal parameters PM11 to PM13 and PS11 to PS13 as second correspondence information. In the present embodiment, a plurality of internal parameter sets ST21 to ST25 are stored in the second storage unit 190 as second correspondence information. Each of the internal parameter sets ST21 to ST25 includes values of internal parameters PM11 to PM13 and PS11 to PS13 corresponding to the value of the second operation parameter OP2.

  FIG. 3 is a diagram illustrating an example of the value of the internal parameter PM1 corresponding to the values of the first and second operation parameters OP1 and OP2. FIG. 3A shows an example of the value of the internal parameter PM1 corresponding to the minimum value, the midpoint value, and the maximum value of the first operation parameter OP1. FIG. 3B shows an example of the value of the internal parameter PM11 corresponding to the minimum value, the midpoint value, and the maximum value of the second operation parameter OP2. Corresponding to an arbitrary value of the first operation parameter OP1 by interpolating the value of the internal parameter PM1 corresponding to the minimum value, the midpoint value, and the maximum value of the first operation parameter OP1 in FIG. The value of the internal parameter PM1 to be obtained can be obtained. Similarly, by interpolating the values of the internal parameter PM11 corresponding to the minimum value, the midpoint value, and the maximum value of the second operation parameter OP2 in FIG. The value of the internal parameter PM11 corresponding to the value can be obtained. The values of the other internal parameters PM2 to PMn and PS1 to PSn corresponding to the value of the first operation parameter OP1 can also be determined by interpolation of the internal parameter sets ST11 to ST13 in FIG. Further, the internal parameters PM11 to PM13 and PS11 to PS13 corresponding to an arbitrary value of the second operation parameter OP2 can also be determined by interpolation of the internal parameter sets ST21 to ST25 in FIG.

  In the example of FIG. 3B, the value of the internal parameter PM11 corresponding to the value of the second operation parameter OP2 monotonously increases, but the internal values corresponding to the values of the first and second operation parameters OP1 and OP2 are increased. The values of the parameters PM1 to PMn, PS1 to PSn, PM11 to PM13, and PS11 to PS13 may not increase monotonously. The values of the internal parameters PM1 to PMn, PS1 to PSn, PM11 to PM13, and PS11 to PS13 corresponding to the values of the first and second operation parameters OP1 and OP2 may be monotonously increased or monotonously decreased. , It may vary in any shape.

  The first control unit 160 obtains the first correspondence information from the first storage unit 180, and the internal parameters PM1 to PMn corresponding to the value of the first operation parameter OP1 based on the obtained first correspondence information. , PS1 to PSn are determined. The second control unit 170 acquires the second correspondence information from the second storage unit 190, and internal parameters PM11 to PM13 corresponding to the value of the second operation parameter OP2 based on the acquired second correspondence information. , PS11 to PS13 are determined. Accordingly, the nature of the acoustic effect by the effect applying units 120M and 120S is controlled based on the value of the first operating parameter OP1, and the acoustic effect of the effect applying units 120M and 120S is controlled based on the value of the second operating parameter OP2. The degree is controlled.

  The first correspondence information may be set so that the property of the acoustic effect by the effect applying units 120M and 120S changes continuously or stepwise according to a change in the value of the first operation parameter OP1. Further, the second correspondence information may be set such that the degree of the acoustic effect by the effect applying units 120M and 120S changes continuously or stepwise according to a change in the value of the second operation parameter OP2. Thereby, the acoustic effect of the stereo acoustic signal AS2 naturally changes.

  The acoustic effect imparting device 100 may be configured by hardware such as an electronic circuit, may be configured by software such as an acoustic effect imparting program, or may be configured by both hardware and software.

  The acoustic effect imparting device 100 is configured by, for example, a DSP (Digital Signal Processor). Note that the acoustic effect applying apparatus 100 may be configured by a dedicated circuit.

  When at least a part of the acoustic effect imparting device 100 is realized by software, a computer program such as an acoustic effect imparting program is stored in the ROM 10 or the storage device 12. In this case, the CPU 11 executes the sound effect imparting program stored in the ROM 10 on the RAM 9 to realize the functions of the components of the sound effect imparting device 100 in FIG. 2 and perform the sound effect imparting process.

  Note that the sound effect applying program may be provided in a form stored in a computer-readable recording medium and installed in the ROM 10 or the storage device 12. In addition, when the communication I / F 13 is connected to a communication network, a sound effect application program distributed from a server connected to the communication network may be installed in the ROM 10 or the storage device 12.

(3) Sound Effect Applying Process FIG. 4 is a flowchart showing the sound effect applying process in the sound effect applying apparatus 100 of FIG. In the initial state, the internal parameters PM1 to PMn, PS1 to PSn, PM11 to PM13, and PS11 to PS13 are set to predetermined values or values corresponding to the previous values of the first and second operation parameters OP1 and OP2. . The stereo sound signal AS1 is input to the M / S converter 110.

  First, the first and second control units 160 and 170 obtain internal parameter sets ST11 to ST13 and ST21 to ST25 as first and second correspondence information from the first and second storage units 180 and 190 ( Step S1). Next, the M / S conversion unit 110 converts the stereo acoustic signal AS1 into a sum signal MS1 and a difference signal SS1 (step S2). The effect imparting unit 120M imparts an acoustic effect to the sum signal MS1 based on the values of the set internal parameters PM1 to PMn, PM11, and PM12, and the effect imparting unit 120S includes the set internal parameters PS1 to PSn, PS11, and PS12. Based on the value, an acoustic effect is applied to the difference signal SS1 (step S3). At this time, the amplifiers 140M and 140S amplify the sum signal MS1 and the difference signal SS1 with a gain based on the values of the internal parameters PM13 and PS13.

  The first control unit 160 acquires the value of the first operation parameter OP1 (step S4), and determines whether or not the value of the first operation parameter OP1 has been changed (step S5). When the value of the first operation parameter OP1 is changed, the first control unit 160 performs an internal parameter corresponding to the value of the first operation parameter OP1 by interpolation (step S6) of the internal parameter sets ST11 to ST13. The values of PM1 to PMn and PS1 to PSn are determined (step S7). The first control unit 160 changes the properties (characteristics or texture) of the acoustic effect by setting the determined values of the internal parameters PM1 to PMn and PS1 to PSn in the effect applying units 120M and 120S (step S8). . If the value of the first operation parameter OP1 has not been changed in step S5, steps S6 to S8 are skipped. Thereby, the property of the acoustic effect is maintained without being changed.

  The second control unit 170 acquires the value of the second operation parameter OP2 (step S9), and determines whether or not the value of the second operation parameter OP2 has been changed (step S10). When the value of the second operation parameter OP2 is changed, the second control unit 170 performs an internal parameter corresponding to the value of the second operation parameter OP2 by interpolation (step S11) of the internal parameter sets ST21 to ST25. The values of PM11 to PM13 and PS11 to PS13 are determined (step S12). The second controller 170 changes the degree of the sound effect by setting the determined values of the internal parameters PM11 to PM13 and PS11 to PS13 in the effect applying units 120M and 120S and the amplifiers 140M and 140S (step S13). . If the value of the second operation parameter OP2 is not changed in step S10, steps S11 to S13 are skipped. Thereby, the degree (depth) of the acoustic effect is maintained without being changed.

  The amplifiers 140M and 140S output a sum signal MS2 and a difference signal SS2 to which an acoustic effect is applied. Next, the M / S reconversion unit 150 converts the sum signal MS2 and the difference signal SS2 to which the acoustic effect is given into a stereo acoustic signal AS2 (step S14). Thereafter, the M / S conversion unit 110 determines whether or not the input of the stereo sound signal AS1 is completed (step S15). If the input of the stereo sound signal AS1 is not completed, the M / S conversion unit 110 returns to step S2. Thereby, the processing of steps S2 to S15 is repeated. When the input of the stereo sound signal AS1 is finished, the sound effect applying process is finished.

(4) Effects of the Embodiment According to the acoustic effect imparting device 100 according to the present embodiment, the user adjusts the value of the first operation parameter OP1 using the setting operator 3 and the sum signal MS1 and The nature of the acoustic effect imparted to each difference signal SS1 is controlled. Moreover, the degree of the acoustic effect imparted to the sum signal MS1 and the difference signal SS1 is controlled by the user of the acoustic effect imparting device 100 adjusting the value of the second operation parameter OP2. In this case, the acoustic effects of the center component and both side components of the sound image by the stereo acoustic signal AS2 are adjusted. Therefore, it is possible to adjust the sound effect of the stereo sound signal in various and easy ways while adjusting the spread of the sound due to the stereo sound signal.

(5) Other Embodiments In the above embodiment, the acoustic effect imparting device 100 is provided in the electronic musical instrument 1, but the acoustic effect imparting device 100 may be provided in other devices such as an acoustic device and a mixer. Good. Moreover, the acoustic effect imparting device 100 may be used as a single acoustic effect imparting device that imparts an acoustic effect to a stereo acoustic signal supplied from the outside.

  The acoustic effect imparting device 100 may be used to impart an acoustic effect to the stereo acoustic signal AS1 input in real time, and is used to impart an acoustic effect to the stereo acoustic signal AS1 stored in the storage medium. May be.

  The number of internal parameters is not limited to the number in the above embodiment, and an arbitrary number of internal parameters may be given to each of the effect applying units 120M and 120S. Note that the number of internal parameters is larger than the number of first and second operation parameters OP1 and OP2.

  The number of internal parameter groups used as the first correspondence information is not limited to 3, and any number of internal parameter groups other than 3 may be stored. Further, the number of internal parameter sets used as the second correspondence information is not limited to 5, and any number of internal parameter sets other than 5 may be stored. Further, the first correspondence information may be a function indicating a correspondence relationship between the value of the first operation parameter OP1 and the values of the internal parameters PM1 to PMn and PS1 to PSn. Similarly, the second correspondence information may be a function indicating a correspondence relationship between the value of the second operation parameter OP2 and the values of the internal parameters PM11 to PM13 and PS11 to PS13.

  In the above embodiment, the internal parameters PM1 to PMn, PS1 to PSn, PM11 to PM13, and PS11 to PS13 have continuous values or multivalues, but some internal parameters specify on / off of a specific function. May have discrete binary values (eg, 1 and 0).

(6) Correspondence between each constituent element of claims and each part of the embodiment Hereinafter, an example of correspondence between each constituent element of the claim and each part of the embodiment will be described. Not. The M / S conversion unit 110 in the above embodiment is an example of the first conversion unit, the effect applying unit 120M is an example of the first acoustic effect applying unit, and the effect applying unit 120S is the second acoustic effect providing. The M / S reconversion unit 150 is an example of a second conversion unit, the first control unit 160 is an example of a first control unit, and the second control unit 170 is a second example. It is an example of the control means. The acoustic effect imparted by the effect imparting unit 120M is an example of the first acoustic effect, the acoustic effect imparted by the effect imparting unit 120S is an example of the second acoustic effect, and the internal parameter sets ST11 to ST13 are the first. 1, the internal parameter sets ST21 to ST25 are examples of the second correspondence information, the effect processing unit 121 is an example of the first or second generation unit, and the wet route WE is the first Or, it is an example of the third path, the dry path DR is an example of the second or fourth path, and the adder 203 is an example of the first or second combining unit. As each constituent element in the claims, various other elements having configurations or functions described in the claims can be used.

  DESCRIPTION OF SYMBOLS 1 ... Electronic musical instrument, 2 ... Performance operator, 3 ... Setting operator, 4 ... Display, 5 ... Signal processing part, 6 ... Sound source part, 8 ... Sound system, 9 ... RAM, 10 ... ROM, 11 ... CPU, DESCRIPTION OF SYMBOLS 12 ... Memory | storage device, 13 ... Communication I / F, 14 ... Bus, 100 ... Sound effect provision apparatus, 110 ... M / S conversion part, 120M, 120S ... Effect provision part, 121 ... Effect processing part, 122 ... Level adjustment part , 140M, 140S ... amplifier, 150 ... M / S reconversion unit, 160 ... first control unit, 170 ... second control unit, 180 ... first storage unit, 190 ... second storage unit, 201, 202 ... Amplifier, 203 ... Adder, AS1, AS2 ... Stereo acoustic signal, DR ... Dry path, L1, L2 ... Left signal, MS1, MS2 ... Sum signal, OP1 ... First operation parameter, OP2 ... Second operation Parameters, PM1 to PMn PS1~PSn, PM11~PM13, PS11~PS13 ... internal parameters, R1, R2 ... right signal, SS1, SS2 ... differential signals, ST11~ST13, ST21~ST25 ... internal parameter set, WE ... wet route

Claims (7)

First conversion means for converting a stereo acoustic signal into a sum signal and a difference signal;
First acoustic effect applying means for applying a first acoustic effect to the sum signal;
Second acoustic effect imparting means for imparting a second acoustic effect to the difference signal;
Second conversion means for converting the sum signal after application of the first acoustic effect and the difference signal after application of the second acoustic effect into a stereo acoustic signal;
First control means for acquiring a value of the first operation parameter, and controlling a property of the first acoustic effect and a property of the second acoustic effect based on the acquired value of the first operation parameter;
Second control means for acquiring a value of the second operation parameter and controlling the degree of the first acoustic effect and the degree of the second acoustic effect based on the acquired value of the second operation parameter; A sound effect imparting device provided. The first control means acquires, as first correspondence information, a correspondence relationship between a predetermined number of values of the first operation parameter and a predetermined number of values representing the nature of the acoustic effect. A value representing a property corresponding to an arbitrary value of the operation parameter is generated by interpolation of the first correspondence information, and based on the generated value, the property of the first acoustic effect and the property of the second acoustic effect The acoustic effect imparting device according to claim 1, wherein the acoustic effect imparting device is controlled. The second control means acquires a correspondence relationship between a predetermined number of values of the second operation parameter and a predetermined number of values representing the degree of the acoustic effect as second correspondence information, and acquires the acquired second A value representing a degree corresponding to an arbitrary value of the operation parameter is generated by interpolation of the second correspondence information, and based on the generated value, the degree of the first acoustic effect and the degree of the second acoustic effect The sound effect imparting device according to claim 1, wherein the sound effect imparting device is controlled. The first acoustic effect imparting means transmits a sum signal to which the first acoustic effect is imparted and a first generator for generating a sum signal to which the first acoustic effect is imparted. A path, a second path for transmitting a sum signal to which the first acoustic effect is not applied, and a first combining unit for combining the sum signal of the first path and the sum signal of the second path; Including
The second acoustic effect imparting means transmits a difference signal to which the second acoustic effect is imparted, and a second generator for generating a difference signal to which the second acoustic effect is imparted, and a third signal for transmitting the difference signal to which the second acoustic effect is imparted. A path, a fourth path for transmitting a difference signal to which the second acoustic effect is not applied, and a second combining unit for combining the difference signal of the third path and the difference signal of the fourth path; Including
The second control means controls the degree of the first acoustic effect by controlling the volume of the sum signal of the first and second paths, respectively, and the difference signal of the third and fourth paths The acoustic effect provision apparatus as described in any one of Claims 1-3 which controls the grade of a said 2nd acoustic effect by controlling each sound volume. The second control means controls the degree of the first acoustic effect by controlling the volume of the sum signal, and controls the degree of the second acoustic effect by controlling the volume of the difference signal. The sound effect imparting device according to any one of claims 1 to 4. Converting a stereo sound signal into a sum signal and a difference signal;
Applying a first acoustic effect to the sum signal;
Applying a second acoustic effect to the difference signal;
Converting the sum signal after application of the first sound effect and the difference signal after application of the second sound effect into a stereo sound signal;
Obtaining a value of the first acoustic parameter, and controlling a property of the first acoustic effect and a property of the second acoustic effect based on the obtained value of the first manipulation parameter;
Obtaining a value of the second operation parameter, and controlling the degree of the first sound effect and the degree of the second sound effect based on the obtained value of the second operation parameter. Grant method. Converting a stereo sound signal into a sum signal and a difference signal;
Applying a first acoustic effect to the sum signal;
Applying a second acoustic effect to the difference signal;
Converting the sum signal after application of the first sound effect and the difference signal after application of the second sound effect into a stereo sound signal;
Obtaining a value of the first acoustic parameter, and controlling a property of the first acoustic effect and a property of the second acoustic effect based on the obtained value of the first manipulation parameter;
Obtaining a value of the second operational parameter, and controlling the degree of the first acoustic effect and the degree of the second acoustic effect based on the obtained value of the second operational parameter;
A sound effect imparting program to be executed by a computer.

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