JP3549991B2 - Sound effect adding device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sound effect adding device that uses a digital signal processor (hereinafter, referred to as a DSP) to add various sound effects to various devices such as an electronic musical instrument, and a sound effect adding circuit provided for each sound effect. By using a pair of storage means and switching the storage means for reading out the sound effect signal at the time of switching the sound effect based on the characteristics as appropriate, the sound effect can be promptly shifted to a new sound effect without giving a sense of incongruity. The present invention relates to a sound effect adding device.
[0002]
[Prior art]
2. Description of the Related Art In recent electronic musical instruments, a DSP is often used as a means for adding a delay signal to impart a sound effect such as a delay, an ensemble, a chorus, a phaser, and a reverb.
[0003]
The delay time of a tone generated by such a DSP differs depending on the type of the tone and the effect to be imparted, and these effects such as delay, chorus, and ensemble are often changed during performance to give variations. Is done.
[0004]
However, these effects that are changed have different delay times depending on the type and performance conditions. Therefore, if only the effect is changed without clearing the previously read memory contents, the delay signal before the change and the changed There is a high possibility that a phase shift from the later delayed signal will occur, which may cause noise.
[0005]
In particular, when the feedback is indispensable, as in the case of the delay, the delayed output signal is fed back to the delay device, so that the noise circulates and a good playing state is often disturbed.
[0006]
For this reason, a method has been proposed in which a gate is applied so that a signal to which a delay effect has been applied is not output for a newly set delay length (delay time) so that noise is not generated at the time of effect switching (JP-A-5-61493). Have been.
[0007]
Here, when the delay time is changed in the middle, the effect signal read from the delay circuit is masked until the newly set delay time elapses, and the noise due to the mixture of new data and old data is masked. Methods to prevent this have been proposed.
[0008]
According to this method, when the delay time is changed from a long time to a short time, for example, when the delay time has been set to 0.5 ms but has been set to 0.2 ms, the previous delay time is set. Since the new signal has been formed before the time has expired, the data stored in the memory may be read out, and the switching can be performed immediately.
[0009]
However, conversely, if the delay time of 0.5 ms has been reset to 0.8 ms, which is longer than this time, new signal formation has not been completed at the time of switching, and a desired delay signal is generated. Until this time, a waiting time corresponding to a longer delay time due to masking or the like was required.
[0010]
Also, even when the setting is made short, such as the above-mentioned 0.2 ms, when the feedback is applied, the feedback signal of the musical tone that has been produced until now is mixed in the delay signal that has already been generated. Therefore, it is not possible to immediately respond to a change in the feedback time from 0.5 ms to 0.2 ms.
[0011]
As described above, according to the method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 5-61493, although noise at the time of switching the delay time can be prevented, basically, the formation of the desired delay signal is completed and the delay signal is output. There is a disadvantage that the response of the sound effect is delayed due to masking.
[0012]
For this reason, there is a demand for a sound effect adding device capable of quickly adding a new sound effect without providing a standby time for interrupting sound emission such as a gate operation or a masking operation.
[0013]
On the other hand, recent advances in semiconductor technology have been remarkable, and the capacity of external memories such as DRAMs (Dynamic RAMs) and S-RAMs used as means for storing input signals and operation results is 4 Mbits, 16 Mbits, 64 Mbits,. The low-priced, large-capacity ones are becoming mainstream, and the storage capacity of the storage means mounted in the electronic musical instrument has room. However, the storage capacity actually used for electronic musical instruments is not so large, about 2 Mbits, so that there is a large amount of idle capacity.
[0014]
Similarly, with the advancement of semiconductor technology, central processing units (hereinafter referred to as CPUs) and DSPs have also been reduced in performance and cost, and the processing capabilities of CPUs and DSPs have been afforded. There is also a demand for effective use of.
[0015]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and when switching of these sound effects is designated using a musical sound original signal input to a DSP and an acoustic effect signal generated based on the musical original signal. It is another object of the present invention to provide a sound effect adding device capable of adding sound effects quickly and without giving an uncomfortable feeling.
[0016]
[Means for Solving the Problems]
The sound effect adding apparatus according to the present invention includes a signal delay unit, an adding unit, first to third switching units, and a mixing unit, and adds a sound effect to a musical tone original signal. The delay means has first and second storage means, sequentially stores the signal output from the first switching means in the first storage means, and stores the signal output from the second switching means in the second storage means. And sequentially reads the signals stored in both storage means a predetermined time ago, and the third switching means reads the signal read from the second storage means or the first storage means. The selection means outputs the signal, the addition means adds the signal selected and output by the third switching means and the tone original signal, and the first switching means adds the signal based on the tone original signal or the addition means. A second switching means for outputting the signal or the musical tone added by the adding means. The mixing means outputs the original signal, adds the tone original signal and the signal selected and output by the third switching means, and outputs the added signal. If the predetermined time is changed, the first to third switching is performed. The means outputs a signal that temporarily changes from one signal to the other signal.
[0017]
Further, the two storage units according to the present invention are provided in a DRAM or an S-RAM used as an external memory.
[0018]
[Action]
The present invention makes effective use of the free space of a memory, which is generated with the increase in the capacity of a DRAM or an S-RAM, and the functions of the CPU 1 and the DSP 9 which have a high performance. By switching between a pair of storage means A and B for reading out a sound effect, a sound effect adding device capable of transmitting a signal with an appropriate sound effect quickly and with a small number of breaks is obtained.
[0019]
For this reason, each sound effect adding circuit 40 constituting the sound effect adding device of the present invention, when a pair of storage means A and B of the same structure provided as a delay memory and the switching of the sound effect is instructed, A switching means 46 for switching the input destination of the generated effect signal and the reading section of the effect signal in conjunction with each other; a calculating means 44 for adding a feedback signal to the original sound signal; and combining the original sound signal and the sound effect signal. And mixing means 45 for mixing.
[0020]
The switching means 46 is constituted by three switches SW1, SW2, and SW3 schematically shown, reads out the sound effect signal by the interlocking switching operation, and stores the effect signal generated by the calculating means 44. The storage means A and B are switched.
[0021]
When the switches SW1, SW2, and SW3 of the switching unit 46 are switched in a predetermined procedure, the input / output circuits of the storage circuits A and B are switched by the configuration illustrated in FIG. The generated tone signal is input to the storage means A or B being output as a sound effect signal.
[0022]
Therefore, the same tone source signal is sent to both storage means A and B at the same timing, but the tone signal to which the feedback signal is added is stored in the storage means B or A which is outputting the effect signal, and the other storage means A or B is outputting the effect signal. Alternatively, the original musical tone signal is stored as it is in B, and the original musical tone signal stored in the other storage means B or A is read at the predetermined timing and is sequentially discarded.
[0023]
With this configuration, when the switching of the sound effect is instructed, the storage means A and B from which the effect signal is read out are switched, so that the new sound effect signal is not affected by the sound effect previously sounded. Can be read out quickly and with few breaks.
[0024]
Therefore, when the sound effect is switched as in the prior art, the effect is gated until a new effect signal is generated. Alternatively, Japanese Patent Application No. 8-337686 previously proposed by the present applicant (Japanese Patent Application Laid-Open No. 10-161657). As in the case of), when the sound effect is switched and when a predetermined effect signal is generated, it is not necessary to switch the reading destination by switching to continuously apply the sound effect, and the structure is simplified.
[0025]
Further, according to the present invention, a free space in a large-capacity DRAM or S-RAM is used as a storage means, and the processing is controlled by a program. There is no need to perform this, and a high-performance sound effect adding device can be provided at low cost.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing a schematic configuration of an electronic musical instrument provided with the sound effect adding device of the present invention, and FIGS. 2 and 3 are block diagrams showing examples of a monaural circuit and a stereo circuit of the sound effect adding circuit. Hereinafter, the configuration of the sound effect adding apparatus according to the present invention will be described with reference to the drawings.
[0027]
In the figure, reference numeral 1 denotes a CPU, 2 denotes a ROM, and 3 denotes a RAM. Reference numeral 4 denotes a keyboard, 5 denotes an operation panel, 6 denotes a MIDI input / output device, 7 denotes a floppy input / output device, 8 denotes a sound source circuit, 9 denotes a DSP, 10 denotes a D / A converter, and 11 denotes a speaker. .
[0028]
The CPU 1 controls each section of the electronic musical instrument in accordance with a control program stored in a program memory section (not shown) of the ROM 2. The CPU 1 is provided with a control section 21. It controls conversion to control values and transfer of DSP programs and multiplication coefficients for controlling each acoustic effect adding circuit 40.
[0029]
The control unit 21 provided in the CPU 1 is realized by a program, controls the electronic musical instrument in general, reads a multiplication coefficient corresponding to a set tone and effect from the control table 22, and This is for controlling the multipliers 41A, 41B, 41C, 41D and the like provided in the respective sound effect adding circuits 40 constituting the DSP 9 shown in FIG.
[0030]
The ROM 2 stores tone data and other various fixed data in addition to the control program for operating the CPU 1 described above. The control table 22 provided in the ROM 2 stores control data for controlling the arithmetic unit 44 in each sound effect adding circuit 40 constituting the DSP 9 according to the tone and the effect set on the operation panel 5. It is remembered.
[0031]
The RAM 3 defines a work area for the CPU 1, various registers for controlling the electronic musical instrument, a counter, a flag, a buffer, and the like. In addition, necessary data among data stored in the ROM 2 is transferred and temporarily stored therein. It has a data area to be stored.
[0032]
Also, a plurality of registers in which data necessary for sound emission are set in accordance with the setting states of the switches on the operation panel 5, and an assigner memory for storing data for assigning each tone generation circuit of the tone generator circuit 8 to an unused channel. The RAM 3 is also provided with a storage area for storing musical information, a register for temporarily storing data for controlling the multipliers 41A, 41B, 41C, 41D, and the like.
[0033]
The keyboard 4 sends a key number and key press information to the CPU 1. The keyboard 4 includes a plurality of keys and key switches that open and close in conjunction with key press / release operations of these keys. The key release operation is detected by a key scan circuit (not shown), and the detected on / off information is temporarily stored in a predetermined area of the RAM 3 together with the key number. Sent.
[0034]
The operation panel 5 is used to select a tone, set a sound effect, select an edit parameter, set write request information of edit data, and the like. The operation panel 5 includes a power switch, a tone selection switch, Various switches, such as an effect selection switch and a rhythm selection switch, and various indicators indicating a state corresponding to an operation state are provided.
[0035]
The set / reset state of each switch of the operation panel 5 is detected by a panel scan circuit included therein, and data on the detected switch set state is stored in a predetermined area of the RAM 3 under the control of the control unit 21. .
[0036]
The setting switches for each tone and effect directly related to the present invention are provided on the operation panel 5, and the set effect is detected by the panel scan circuit, and the control unit 21 detects the detected effect. Based on the signal, the control value is read from the control table 22 of the ROM 2 and temporarily stored in a predetermined area of the RAM 3. When a predetermined timing comes, the control value is read and sent to the DSP 9.
[0037]
The MIDI input / output device 6 performs input / output processing of MIDI information. The MIDI input / output device 6 fetches necessary MIDI information from the outside, or sets performance information or the like corresponding to key-on as MIDI information to the external device via a MIDI interface circuit. Send out. As a result, the tone and tone are changed according to the MIDI information from the external device, or the processing and recording in the external device by the MIDI output are performed.
[0038]
The floppy input / output device 7 performs recording / reproduction of performance information and the like, and is provided with a floppy disk (hereinafter referred to as FD) as a storage medium. For example, when the recording (storing) of performance information is instructed from the operation panel 5, the performance information corresponding to the output of the electronic musical instrument is recorded in the FD, or when the reproduction (performance) start is instructed, the performance recorded in the FD is performed. The information is read and the music is played.
[0039]
The tone generator circuit 8 sequentially reads out tone waveform data corresponding to the signal sent from the CPU 1 from a waveform memory (not shown), adds necessary envelope characteristics to the read tone waveform data, and outputs it as a tone signal.
[0040]
The DSP 9 adds a sound effect by giving a desired delay characteristic to the original tone signal generated by the tone generator circuit 8, and performs high-speed processing of the digitized tone signal at each sampling timing sent from the tone generator circuit 8. By executing writing / reading to / from the memory, a delay corresponding to the number of storage stages of the memory is realized.
[0041]
The arithmetic unit 44 of each sound effect adding circuit 40 constituted by the program of the DSP 9 includes multipliers 41A and 41B and an adder 42A, and outputs the original tone signal sent from the tone generator 8 and the effect signal. The multiplication is performed by multiplying a feedback signal from either the storage circuit A or B by a predetermined multiplication coefficient and adding the result, thereby adding an effect to the musical tone original signal.
[0042]
The sound effect adding circuit 40 can realize various complicated delay forms and feedback state combinations by a program. The configuration and operation of the sound effect adding circuit 40 will be described in detail with reference to FIG.
[0043]
The D / A converter 10 converts an input digital tone signal into an analog tone signal. The tone signal digital / analog converted by the D / A converter 10 is amplified to a desired gain by an amplifier (not shown) and supplied to the speaker 11.
[0044]
The speaker 11 converts an analog tone signal as an electric signal sent from the amplifier into an acoustic signal. That is, a tone is emitted according to the generated tone signal.
[0045]
FIG. 2 is a diagram illustrating the configuration and operation of a monaural sound effect adding circuit 40 used when the DSP 9 (FIG. 1) of the electronic musical instrument generates an effect signal for each sound effect by program processing. Hereinafter, the configuration and operation of the sound effect adding circuit 40 will be described using the case of the monaural device in FIG. 2 as an example.
[0046]
The sound effect adding circuit 40 exemplifying three types of circuits generates a delay signal for each sound effect, and includes a pair of storage circuits A and B that are selectively switched and used; For the sake of convenience of explanation, the switching unit 46 is composed of three switches SW1, SW2, and SW3 having the simplest configuration, and the mixing unit 45. A tone signal corresponding to each sound effect generated by the sound effect adding circuit 40 is synthesized by the adder 43 and output.
[0047]
The pair of storage circuits A and B have the same configuration, and are provided for each acoustic effect adding circuit 40 using, for example, an empty memory of a D-RAM. B (or A), which is one of these storage circuits, stores a sound effect signal generated in a time series in a time-division manner based on a musical tone original signal and a feedback signal.
[0048]
A (or B), which is the other of the pair of storage circuits A and B, is used as a back memory at that time. The original tone signal is input as it is and time-divided. It is memorized. For this reason, the output of the storage circuit A (or B), which is the back memory, is turned off by SW3 forming the switching means 46, and the feedback circuit is shut off.
[0049]
Note that the storage capacity required by the storage circuits A and B in the present invention only needs to have a capacity that can cope with the delay requiring the longest delay time, and the longest delay time required by the delay is practically 1 0.0 to 1.2 seconds. For example, when the sampling density of a stereo apparatus is 44.1 kHz, the storage capacity required to obtain a delay time of about 1.0 second is about 2 Mbits.
[0050]
Therefore, in consideration of the current situation where the capacity of DRAMs is shifting from 4 Mbits to 16 Mbits, and further to 64 Mbits, it is necessary to always store the original tone signal in the surplus portion of the current 4 Mbits DRAM capacity. Thus, an input signal having an arbitrary delay time can be used immediately.
[0051]
Thus, even when a delay effect having a long delay time is required, the storage circuit A or B for reading out the effect signal is switched as soon as a new effect is selected, so that it is much more effective than the conventional similar device. A new effect signal can be output quickly.
[0052]
The configuration and function of the pair of storage circuits A and B can be switched between each other by the operation of a switching means 46 formed of three switches SW1, SW2 and SW3 as described later.
[0053]
The arithmetic unit 44 includes multipliers 41A and 41B and an adder 42A, and has a function of adding a predetermined effect to the musical tone original signal. That is, the musical tone original signal sent from the tone generator 8 is multiplied by a predetermined coefficient in a multiplier 41A, and the feedback signal is multiplied by a predetermined coefficient by a multiplier 41B to add a desired effect.
[0054]
The two signals to which the effect is added by the multiplier 41A and the multiplier 41B are added in the adder 42A to be combined into one tone signal, and either one of the storage circuits A or B selected by the switching means 46 is selected. Sent to and stored.
[0055]
The switching means 46 switches the output of the storage circuits A and B for reading out the sound effect signal and the input of the storage circuit A or B for storing the effect signal generated by the arithmetic unit 44, and includes three switches SW1 and SW2. , SW3, and are configured to operate in conjunction with each other.
[0056]
For example, in the state of each switch in the switching means 46 illustrated in FIG. 2, the switches SW1 and SW2 of the input circuit for controlling the input signals to the storage circuits A and B are connected to the upper contact, and the switch SW3 is connected to the lower switch. The sound effect signal is being output from the storage circuit B while being connected to the contact.
[0057]
Therefore, since the contact of the switch SW1 of the circuit for applying the tone signal to which the desired sound effect has been processed and added to the storage circuit A to the storage circuit A is turned off, a part of the tone source signal input from the tone generator circuit 8 is turned off. Are input to and stored in the storage circuit A without any processing.
[0058]
At this time, since the output circuit from the storage circuit A is also turned off by the switch SW3, there is no output from the storage circuit A and no feedback signal is fed back. Therefore, the musical tone original signal stored in the storage circuit A is discarded by empty reading at a predetermined timing.
[0059]
On the other hand, since the contact point of the switch SW2 is also connected upward, the sound effect signal synthesized by the arithmetic unit 44 is time-divided and sent to the storage circuit B at a predetermined timing to be stored. At this time, the sound effect signal is sequentially read from the storage circuit B and input to the mixing unit 45 since the SW3 is connected to the lower contact in conjunction with the operation.
[0060]
A part of the signal output from the storage circuit B becomes a feedback signal and is fed back to the arithmetic unit 44. After a predetermined effect is added by the multiplier 41B, the tone generated by the multiplier 41A is added by the adder 42A. And stored in the storage circuit B.
[0061]
When the switching means 46 is switched to the opposite state for sound effect switching, the settings of the three switches are reversed, and both switches SW1 and SW2 are connected to the lower contact, and switch SW3 is connected to the upper contact. You. Therefore, the above situation is reversed, and the sound effect signal synthesized by the arithmetic unit 44 is stored in the storage circuit A, and the musical tone original signal is stored in the storage circuit B as it is.
[0062]
With such a configuration, when an effect switching is instructed by the player's operation, the switches SW1, SW2, and SW3 of the switching means 46 are switched in conjunction with each other, so that the feedback signal is always stored as the effect signal is being output. After being read out from one of the circuits B and A and fed back to the arithmetic unit 44 and synthesized with the original musical tone signal, the effect signal is sequentially stored in the memory circuit B or A being output.
[0063]
Therefore, when the sound effect is switched, the sound effect specified by the new switching operation can be output without being affected by the sound effect that has been sounded so far. There is no need to gate or mask the effect until the sound is generated.
[0064]
The mixing section 45 is composed of multipliers 41C and 41D and an adder 42B, and is used by the player to adjust the mixing ratio of the original sound signal and the delayed sound effect signal. The signal adjusted to have the desired mixing ratio set by the slider volume or the like is added by the adder 42B and sent to the downstream adder 43.
[0065]
The adder 43 combines the effect signals generated by the respective acoustic effect adding circuits 40 such as delay, chorus, and ensemble, and the tone signal synthesized by the adder 43 is sent to the D / A converter 10. Sent.
[0066]
With this configuration, when a new delay time or effect is set, the switch of the switching means 46 is immediately switched, and as a result, the storage circuit A (or B) for reading out the sound effect signal is switched to B (or A) for feedback. The signal output from the newly switched storage circuit B (or A) is fed back to the storage circuit B (or A).
[0067]
Therefore, it is not necessary to newly generate the switched sound effect signal in the storage circuit in which the previous sound effect signal remains, and it is possible to add a new sound effect immediately after the effect switching operation. Therefore, there is no need to perform a gate process until a new sound effect signal is formed or perform a masking process according to a change in the number of delay stages as in the conventional device.
[0068]
Further, according to the present invention, since it is possible to control in a software manner by using a free memory such as a DRAM or an S-RAM which has a large capacity and a margin, it is not necessary to newly provide a memory, and the performance is improved. It is possible to perform writing / reading to a memory and arithmetic processing using the surplus capacity of the CPU 1 or DSP 9.
[0069]
Therefore, it is not necessary to newly add hardware, and a low-cost and high-performance sound effect adding apparatus can be provided. Note that the sound effect adding apparatus of the present invention is not limited to the electronic musical instrument of the present embodiment, but can be applied to other audio equipment such as an audio amplifier, karaoke, and a car stereo.
[0070]
In the present embodiment, for the sake of simplicity, a case where a simple switch (selector) is used for all three switches SW1, SW2, and SW3 is shown, but the actual switch is a multiplier similar to the arithmetic unit 44. The on / off control is performed by multiplying the turning-on side by a multiplication coefficient 1 and the turning-off side by a multiplication coefficient 0.
[0071]
Accordingly, when the above-described multiplier and adder are used as the switch SW3 illustrated in FIG. 2, for example, the multiplier on the storage circuit B side of the switch SW3 has data that attenuates from the maximum value to 0 in 100 ms units, that is, the attenuation characteristic. The envelope is given as a multiplication coefficient, and data increasing from 0 to the maximum value in 100 ms units, that is, the envelope of the increasing characteristic is sequentially given to the multiplier on the side of the storage circuit A as a multiplication coefficient, so that a smoother envelope characteristic is added. In addition, the switching can be performed without any uncomfortable feeling.
[0072]
The original tone signals sent to the storage circuits A and B are not only original tone signals generated by the tone generator 8 but also signals close to the original signals such as, for example, signals obtained by filtering the original tone signals to cut high frequencies. You can also.
[0073]
Further, the musical tone original signal may be processed and stored. Furthermore, the original tone signal input to each acoustic effect adding circuit 40 may be a similar filtered signal.
[0074]
FIG. 3 shows a case where the sound effect adding circuit 40 is applied to the DSP 9 of a stereo device. A circuit configuration similar to the sound effect adding circuit 40 illustrated in FIG. 2 is provided for each of the left and right channels. .
[0075]
Therefore, the configuration and operation of each sound effect adding circuit 40 in the case of the stereo device are the same as the configuration and operation in the case of the monaural device described above, and thus the description thereof is omitted.
[0076]
【The invention's effect】
As described in detail above, according to the device of the present invention, when the switching of the sound effect is instructed, the storage circuit that reads out the sound effect signal is alternately switched every time the switching operation of the switching unit is performed, Since a new sound effect is immediately read out, there is no need to wait until a predetermined delay time has elapsed. Therefore, according to the present invention, it is possible to provide a sound effect adding device that can add a sound effect that is natural and has no auditory discomfort with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an overall configuration of an electronic musical instrument including a sound effect adding device according to the present invention.
FIG. 2 is a diagram illustrating a configuration and an operation when the sound effect adding device according to the present invention is applied to a monaural device.
FIG. 3 is a diagram showing a configuration in a case where the sound effect adding device according to the present invention is applied to a stereo device.
[Explanation of symbols]
1 CPU
2 ROM
3 RAM
4 keys
5 Operation panel and display
6 MIDI input / output device
7 Floppy input / output device
8 sound source circuit
9 Digital signal processor (DSP, sound effect adding device)
10 D / A converter
11 Speaker
21 Control unit
22 Control table
40 sound effect addition circuit
41A, 41B, 41C, 41D, 41LA, 41LB, 41LC, 41LD, 41RA, 41RB, 41RC, 41RD Multiplier
42A, 42B, 42LA, 42LB, 42RA, 42RB Adders
43, 43L, 43R Adder
44, 44L, 44R Arithmetic unit (arithmetic means)
45, 45L, 45R mixing output section (mixing output means)
46 switching unit (switching means)
A, B, L1, L2, R1, R2 storage circuit (storage means)
SW1, SW2, SW3, SWL1, SWL2, SWL3, SWR1, SWR2, SWR3 switch

Claims (2)

A sound effect adding device having a signal delay unit, an addition unit, first to third switching units, and a mixing unit, and adding a sound effect to a musical tone original signal,
The signal delay unit has first and second storage units, sequentially stores the signal output from the first switching unit in the first storage unit, and stores the signal output from the second switching unit in the first storage unit. 2, and sequentially read out the signals stored in both storage means a predetermined time ago,
The third switching means selects and outputs a signal read from the second storage means or the first storage means,
The adding means adds the signal selected and output by the third switching means and the tone original signal,
The first switching means outputs a tone original signal or a signal added by the adding means,
The second switching means outputs the signal added by the adding means or the tone original signal,
The mixing means adds and outputs the tone original signal and the signal selected and output by the third switching means,
When the predetermined time is changed, the first to third switching units output a signal that temporarily changes from one signal to the other signal, and is output as a sound effect adding device. 2. The sound effect adding device according to claim 1, wherein said both storage means are provided in a DRAM or an S-RAM used as an external memory.

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