JPH10222165A - Sound effect adding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and uninterruptedly add noiseless sound effect by switching the storage part, which reads an effect signal through the switching operation of a switching part, with the change-over of the sound effect instructed. SOLUTION: The signal, to which an effect is added by multipliers 41A and 41B, is added by an adder 42A, synthesized into a musical sound signal, transmitted to a storage circuit A or B set by a switching part 46 and stored. The effect signal synthesized by an arithmetic part 44 is stored in the storage circuit A, while the musical sound original signal is stored as is in the storage circuit B. Then, with the change-over of the effect instructed, each switch SW1, SW2, SW3 of the switching part 46 is switched, so that the feedback signal is constantly read out from the storage circuit outputting the effect signal, transmitted to the arithmetic part 44, synthesized into the musical sound original signal, and then stored in the storage circuit outputting the effect signal. Consequently, it immediately allows the output of the newly switched musical sound effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound effect adding device for an electronic musical instrument using a digital signal processor (hereinafter referred to as DSP) as a sound effect adding means, and provided for each sound effect. The present invention relates to a sound effect adding apparatus which can quickly and seamlessly add a sound effect by switching a storage means for reading out an effect signal when the sound effect is switched using a plurality of storage means.

[0002]

2. Description of the Related Art In recent years, an electronic musical instrument using a DSP as a means for adding a delay signal to impart an acoustic effect such as a delay, an ensemble, a chorus, a phaser, a reverb and the like has been widely used.

The delay time of a musical tone generated by such a DSP differs depending on the type of the musical tone and the effect to be given, and the effects such as delay, chorus, and ensemble are often changed during performance. .

However, since the effect to be changed differs in delay time depending on the type and performance conditions, if only the effect is changed without clearing the previously read memory contents, the delay signal before the change and the changed The subsequent phase shift of the delay signal may cause noise.

In particular, the effect of having a feedback like a delay is that the delayed output signal is fed back to the delay device, so that noise circulates, and the effect is large.

For this reason, in order to prevent noise from occurring at the time of effect switching, a method of gated without outputting a signal to which a delay effect is applied for a newly set delay length (delay time) (Japanese Patent Laid-Open No. 5-61493). Has been proposed.

Here, a method has been proposed in which when the delay time is changed halfway, the effect signal read from the delay circuit is masked until the new delay time elapses to prevent noise due to old data. .

According to this method, for example,
In the case where the delay time is set to ms but is reset to 0.2 ms, since the delay signal has already been generated, the data stored in the memory may be read out, so that the switching can be performed immediately. .

However, conversely, if the time is reset to 0.8 ms, no delay signal has been generated yet, so that
It is necessary to wait by masking until a desired delay signal is generated.

[0010] Even when the time is reset to 0.2 ms, when feedback is applied,
Since the feedback signal of the musical tone that has been generated until now is mixed in the already generated delay signal, it is not possible to cope with a change in the feedback time from 0.5 ms to 0.2 ms.

As described above, according to the method disclosed in Japanese Patent Application Laid-Open No. 5-61493, noise can be prevented when switching the delay time. However, basically, the delay signal is masked until a desired delay signal is output. Therefore, there is a disadvantage that the response of the sound effect is delayed.

Therefore, there is a need for a sound effect adding device capable of adding a sound effect that is continuous and noise-free more quickly.

On the other hand, recent advances in semiconductor technology have been remarkable.
D used as a means for storing input signals and calculation results
The capacity of external memories such as RAMs and S-RAMs is becoming low-cost, large-capacity 4 Mbits, 16 Mbits, 64 Mbits, and so on. The storage capacity used for the effects device is 2
Since it is not so much, about M bits, there is waste.

Also, CPUs and DSPs have been reduced in performance and cost, and the processing capabilities of the CPUs and DSPs have a margin, and effective utilization of the functions of the CPUs and DSPs is also required.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a plurality of storage means capable of time-dividing a musical tone original signal or a generated effect signal input to a DSP and storing the signal in time series. One of them stores the generated effect signal and the other stores the original sound signal. When the sound effect is switched, by switching the connection destination of the storage means for reading out the effect signal together with the function of the storage means, a rapid and seamless It is an object of the present invention to provide a sound effect adding device capable of adding a sound effect without a sound effect.

[0016]

According to the present invention, there is provided an acoustic effect adding apparatus having a function of generating a delay signal corresponding to an input musical sound original signal by using a digital signal processor to add an effect. A plurality of storage means A and B capable of time-divisionally storing an effect signal based on the musical tone original signal and storing means A and B for reading out the effect signal when the switching of the sound effect is instructed. Switching means 46 for selectively switching between the storage means A and B, and the arithmetic means 44 for adding the feedback signal from the storage means A or B from which the effect signal is being read to the tone original signal.
And an adjusting means 45 for mixing the input musical tone original signal and the delayed musical tone signal read from the storage means A or B set by the switching means 46. One of B stores the effect signal generated by the calculating means 44, the other stores the tone source signal, and when the switching means 46 is switched, the functions and connections of the plurality of storage means A and B are changed. It is configured to switch in conjunction with it.

Further, the plurality of storage means A and B are provided in a DRAM or S-RAM used as an external memory.

[0018]

According to the present invention, a free memory generated with a large capacity such as a DRAM or an S-RAM and a high performance CPU 1 or D
The sound effect is switched by switching the storage means A and B for reading out the effect signal by effectively utilizing the function of the SP9, and the signal to which the sound effect is added is quickly and seamlessly transmitted.

For this reason, each of the sound effect adders 40 of the sound effect adding apparatus of the present invention is provided with a plurality of storage means A and B of the same configuration provided as a delay memory and when switching of the sound effect is instructed. Switching means 46 for switching the input destination of the generated effect signal and the effect signal by reading and linking the effect signal; calculating means 44 for adding a feedback signal to the musical sound original signal; adjusting means for synthesizing the musical sound original signal and the effect signal 45.

The switching means 46 is for switching between the storage means A and B for reading out the sound effect signal by the switching operation and for storing the effect signal generated by the arithmetic means 44.

When the switching means 46 is switched, the input / output circuit is switched by the configuration shown in FIG.
The tone signal to which the feedback signal is added by the arithmetic means 44 is inputted to the storage means A or B which is outputting the effect signal.

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 A or B which is outputting the effect signal. The original musical tone signal is stored in the storage means B or A as it is, and the original musical tone signal stored in the other storage means B or A is read out at a predetermined timing and sequentially discarded.

With this configuration, when the sound effect is switched, the storage means A and B from which the effect signal is read out are switched, so that the effect signal free from noise without being affected by the previously sounded sound effect can be quickly obtained. In addition, it is possible to read out seamlessly.

Therefore, when the sound effect is switched as in the prior art, the effect is gated until a new effect signal is generated, or the present applicant has previously proposed Japanese Patent Application No. 8-37686.
As described above, at the time of switching the sound effect 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 simple.

Also, according to the present invention, a large capacity DR
Using the free space of AM or S-RAM as storage means,
Since the processing is controlled by the program, it is not necessary to provide any new hardware or the like, and a high-performance sound effect adding apparatus can be provided at a low price.

[0026]

FIG. 1 is a block diagram showing a schematic configuration of an electronic musical instrument provided with a sound effect adding device according to the present invention. Hereinafter, the configuration of the sound effect adding apparatus of the present invention will be described with reference to the drawings.

In the figure, 1 is a CPU and 2 is an RO
M and 3 are RAMs. 4 is a keyboard, 5 is an operation panel, 6 is a MIDI input / output device, 7 is a floppy input / output device, 8 is a tone generator circuit, 9 is a DSP, 10 is a D / A converter,
11 is a speaker.

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 for controlling a set mode. The conversion to each control value and the transfer of a DSP program and a multiplication coefficient for controlling each sound effect adder 40 are controlled.

The control unit 2 provided in the CPU 1
Numeral 1 is realized by a program. In addition to controlling the electronic musical instrument in general, a multiplication coefficient corresponding to a set timbre and effect is read from the control table 22, and the DSP 9 is executed.
Is provided to each of the multipliers 41 provided in each of the sound effect adders 40 constituting the above.

The ROM 2 stores tone color 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 of each sound effect adder 40 constituting the DSP 9 in accordance with the tone and the effect set on the operation panel 5. It is remembered.

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, and transfers necessary data among data stored in the ROM 2. It has a data area that is temporarily stored.

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 data for allocating each tone generation circuit of the tone generator 8 to an unused channel. Assigner memory for storing, storage area for storing musical sound information, multipliers 41A, 41
A register for temporarily storing data for controlling 1B, 41C, and 41D is also provided in the RAM 3.

The keyboard 4 stores a key number as key pressing information in the CPU.
The key scan circuit (not shown) includes a plurality of keys and a key switch that opens and closes in conjunction with key press / release operations of these keys. And the detected on / off information is temporarily stored together with the key number in a predetermined area of the RAM 3, read out at a predetermined timing, and sent to the tone generator 8.

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 is provided with various switches and indicators such as a tone color selection switch, an effect selection switch, and a rhythm selection switch, in addition to a power switch.

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. It is memorized.

The setting switches for each tone and effect directly related to the present invention are provided on the operation panel 5. The set effect is detected by the panel scan circuit. ROM based on detected signal
2 is read out from the control table 22 in the RAM 3
Is temporarily stored in a predetermined area, and is read out and sent to the DSP 9 at a predetermined timing.

The MIDI input / output device 6 performs MIDI output processing, and sends performance information and the like corresponding to key-on as MIDI information to an external device via a MIDI interface circuit. As a result, the external device changes the pronunciation and timbre, or performs recording or the like.

The floppy input / output device 7 stores performance information and the like. For example, when a start of performance is instructed from the operation panel 5, the performance information is read and music is played. For this reason, a floppy disk as a storage medium is mounted on the floppy input / output device 7.

The tone generator 8 reads out the tone waveform data corresponding to the signal sent from the CPU 1 from a waveform memory (not shown), adds an envelope to the read tone waveform data, and outputs it as a tone signal.

The DSP 9 adds a desired delay to the original tone signal generated by the tone generator circuit 8 to add a sound effect. The DSP 9 converts the tone signal digitized at each sampling timing sent from the tone generator circuit 8. By performing high-speed processing and writing / reading to / from the memory, a delay corresponding to the number of storage stages of the memory is realized.

The arithmetic unit 44 of each sound effect adder 40 constituted by the program of the DSP 9 includes a multiplier 41A,
41B and an adder 42A, multiplying the original tone signal sent from the tone generator 8 or the feedback signal from the storage unit A or B which is outputting the effect signal by a predetermined multiplication coefficient to give an effect, The effect is added to the original tone signal.

The sound effect adder 40 can realize various complicated delays and feedback combinations by a program. The configuration and operation of the sound effect adder 40 will be described in detail with reference to FIG.

The D / A converter 10 converts an input digital tone signal into an analog tone signal. The tone signal analog-converted by the D / A converter 10 is
The speaker 1 is amplified to a predetermined gain by an amplifier (not shown).
1 is supplied.

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.

FIG. 2 is a diagram for explaining the configuration and operation of the sound effect adder 40 used when the DSP 9 of the monaural device generates an effect signal for each sound effect by program processing. Hereinafter, the configuration and operation of the sound effect adder 40 will be described using the case of the monaural device in FIG. 2 as an example.

The sound effect adder 40 generates a delay signal for each sound effect, and includes a plurality of storage circuits A and B.
And an arithmetic unit 44, a switching unit 46, and an adjusting unit 45.
The tone signal for each sound effect generated by the sound effect adder 40 is synthesized by the adder 43.

The plurality of storage circuits A and B have the same configuration, and one of them stores an effect signal which is time-divided based on a musical tone original signal and a feedback signal and generated in time series. For example, the sound effect adding device 40 is provided for each sound effect adding device 40 using an empty memory of the D-RAM.

On the other hand, the other of the plurality of storage circuits A and B is used as a back memory, and the original tone signal is inputted as it is, time-divided and stored in chronological order. Therefore, the feedback circuit to the storage circuit A is turned off by the switching unit 46.

The storage circuits A and B of the present invention need only have a storage capacity that can handle the delay requiring the longest delay time. The longest delay time required by the delay is usually about 1.0 to 1.2 seconds, and when the sampling density is 44.1 KHz using stereo, it is necessary to obtain a delay time of about 1.0 second. The storage capacity is about 2M bits.

Therefore, taking into account the current situation where the capacity of DRAMs is shifting from 4 Mbits to 16 Mbits and further to 64 Mbits, the current 4 Mbit DRAMs are considered.
By always storing the original musical tone signal in the surplus part of the capacity, an input signal with an arbitrary delay time can be used immediately.

As a result, even in the case of a delay effect having a long delay time, a new effect signal can be output much faster than in the past by switching the storage circuit A or B for reading out the effect signal as soon as a new effect is selected. .

The configurations and functions of the plurality of storage circuits A and B can be mutually interchanged by the operation of the switching section 46 described later.

The arithmetic unit 44 comprises multipliers 41A and 41B and an adder 42A, and adds a predetermined effect to the original musical tone signal. That is, the original tone signal sent from the tone generator circuit 8 is multiplied by a predetermined coefficient in the multiplier 41A to add an effect, and the multiplier 41B is added to the feedback signal.
Is multiplied by a predetermined coefficient to add an effect.

The signals to which the effects have been added by the multipliers 41A and 41B are added by the adder 42A to be combined into one tone signal, and sent to the storage circuit A or B set by the switching section 46. Stored.

The switching section 46 switches between the storage circuits A and B for reading out the sound effect signal and the storage circuits A or B for storing the effect signal generated by the operation section 44.
W1, SW2, and SW3 are configured to operate in conjunction with each other.

For example, when the sound effect signal is being output from the storage circuit B in the state of the switch 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 upward. The switch SW3 of the output circuit for controlling the output signal is set downward.

Therefore, since the switch of the circuit for sending the tone signal synthesized by the arithmetic unit 44 to the storage circuit A is turned off, a part of the tone source signal sent from the tone generator 8 is not subjected to any processing. Instead, it is sent to the storage circuit A and stored there.

At this time, the output circuit from the storage circuit A is also S
Since it is turned off by W3, there is no output from the storage circuit A and no feedback signal is sent. Therefore,
The musical tone original signal stored in the storage circuit A is read out at a predetermined timing and is discarded.

On the other hand, since SW2 is set upward, the 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 effect signal is sequentially read from the storage circuit B and sent to the adjustment unit 45 because the SW3 is set downward in conjunction with the operation.

A part of the signal output from the storage circuit B becomes a feedback signal and is sent to the arithmetic unit 44. After a predetermined effect is added by the multiplier 41B, the adder 42
At A, it is added to the musical tone generated by the multiplier 41A and stored in the storage circuit B.

The switching unit 4 for switching the sound effect
6 is switched, the switch setting is reversed and SW
1 and SW2 switches are set downward, and SW
3 is set upward. Therefore, the effect signal synthesized by the arithmetic unit 44 is stored in the storage circuit A, and the original tone signal is stored in the storage circuit B as it is.

With such a configuration, when an effect switch is instructed, the switches SW1 and SW of the switch 46 are switched.
2. Since the SW3 is switched, the feedback signal is always read from the storage circuit that is outputting the effect signal, sent to the arithmetic unit 44 and synthesized into the original musical tone signal, and then the storage circuit that is outputting the effect signal. Will be stored.

Therefore, at the time of switching the sound effect, the newly switched sound effect can be output immediately 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 effect is generated.

The adjusting section 45 is composed of multipliers 41D and 41C and an adder 42B. The player adjusts the mixing ratio of the tone signal and the delayed effect signal. The signal adjusted to the mixing ratio set by the use is added by the adder 42B and sent to the adder 43.

The adder 43 synthesizes the effect signal for each effect generated for each sound effect adder 40 such as delay, chorus, ensemble and the like.
Is transmitted to the D / A converter 10.

With this configuration, when a new delay time or effect is set, the switch of the switching unit 46 is immediately switched to switch the storage unit A or B for reading out the sound effect signal, and the feedback signal is also stored in the storage unit. A
Alternatively, the signal output from B is fed back to the storage unit A or B.

Therefore, it is not necessary to generate a new sound effect signal in the memory where the old sound effect signal remains, and it is possible to add a new effect immediately at the time of effect switching. It is not necessary to gate until it is formed or to perform switching in accordance with the change in the number of delay stages, and it is possible to prevent transient noise and discontinuous sounding from occurring at the time of switching.

Further, according to the present invention, a free memory such as a DRAM or an S-RAM, which has a large capacity and a margin is provided, is controlled in a software manner. Writing / reading to the memory and arithmetic processing using the surplus capacity of the CPU 1 and DSP 9 are performed.

Therefore, it is not necessary to newly provide 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 present embodiment, and can be applied to other audio equipment such as an audio amplifier, karaoke, and a car stereo.

In this embodiment, SW1, SW2 and SW3 are all simple switches for easy understanding.
Is shown, the actual switch is composed of a multiplier and an adder as in the case of the arithmetic unit 44, and the multiplication coefficient 1 is set to the ON side and the multiplication coefficient 0 is set to the OFF side.
On / off control by multiplying by

Therefore, when the above-described multiplier and adder are used for the SW3 illustrated in FIG. 2, for example, the data on the storage circuit B side of the SW3 is provided with the data attenuating from the maximum value to 0 in 100 ms units by the multiplication coefficient. It is also possible to add an envelope to the multiplier on the storage circuit A side by sequentially giving data that increases from 0 to the maximum value in 100 ms units as a multiplication coefficient.

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 original tone signals such as signals obtained by filtering the original tone signals to cut harmonics. The signal can be close to

Further, the musical tone original signal may be processed and stored. Furthermore, each sound effect adder 4
The original tone signal input to 0 may be the same filtered signal.

FIG. 3 shows a case in which the sound effect adder 40 is applied to the DSP 9 of a stereo device. Devices having the same configuration as the sound effect adder 40 illustrated in FIG. Have been.

Accordingly, the configuration and operation of each sound effect adder 40 in the case of the stereo device are the same as the configuration and operation in the case of the above-described monaural device, and the description thereof will be omitted.

[0076]

As described in detail above, according to the apparatus of the present invention, when the switching of the sound effect is instructed, the switching operation of the switching unit switches the storage unit for reading out the effect signal, and immediately starts a new operation. Since the sound effect is read out, it is not necessary to wait until a predetermined delay time has elapsed, and a sound effect without a break and without noise can be added quickly.

Therefore, according to the present invention, it is possible to provide a sound effect adding apparatus which can add a natural and natural sound effect 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]

DESCRIPTION OF SYMBOLS 1 CPU 2 ROM 3 RAM 4 keyboard 5 operation panel / 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 adder 41A, 41B, 41C, 41D, 41LA, 41L
B, 41LC, 41LD, 41RA, 41RB, 41R
C, 41RD Multiplier 42A, 42B, 42LA, 42LB, 42RA, 42
RB adder 43, 43L, 43R Adder 44, 44L, 44R Operation unit (operation unit) 45, 45L, 45R Adjustment unit (adjustment unit) 46 Switching unit (switching unit) A, B, L1, L2, R1, R2 Storage circuit (storage means) SW1, SW2, SW3, SWL1, SWL2, SWL
3, SWR1, SWR2, SWR3 switch

Claims (2)

[Claims] 1. Using a digital signal processor,
A sound effect adding apparatus having a function of generating a delay signal according to an input musical sound source signal and adding an effect, wherein a plurality of effect signals based on the input musical sound source signal can be time-divided and stored in time series. A switching means for selectively switching the storage means for reading out the effect signal between the plurality of storage means when the switching of the sound effect is instructed; and a feedback signal from the storage means for reading out the effect signal. Computing means for adding a tone source signal to the tone source signal; and adjusting means for mixing the input tone source signal and the delayed tone signal read from the storage means set by the switching means. Either of the storage means,
The sound signal is characterized by storing an effect signal generated by the calculating means, storing a tone source signal on the other side, and switching the functions and connections of the plurality of storage means in conjunction with switching of the switching means. Effect adding device. 2. The sound effect adding device according to claim 1, wherein said plurality of storage means are provided in a DRAM or an S-RAM used as an external memory.