JPH06308950A - Effect adding device - Google Patents

Abstract

PURPOSE:To add a proper effect by counting a tempo signal generated at a period according to the tempo of a composition outputted from a sequencer, etc., and setting a gate time. CONSTITUTION:An MIDI signal is generated based on the MIDI data of the stored composition by the MIDI sequencer 5. By a sound source system, the MIDI signal is received, and the musical sound signals of plural channels are generated simultaneously according to the data. The musical sounds different from each other are generated simultaneously in the sound source system by connecting plural devices in parallel and specifying the MIDI channels to respective devices. Then, a reverb device 7 is connected to e.g. the sound source of a percussion, and the MIDI signal is inputted from the MIDI sequencer 5, and a gate reverb effect is added to the musical sound. The output is amplified by an amplifier 8 to be pronounced from a speaker 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an effect adding device, and more particularly, to a so-called gate reverb device which obtains a special effect by adding reverberation for a predetermined time and then eliminating the reverberation. .

[0002]

2. Description of the Related Art A gate reverb device is an effect adding device which adds a reverberant sound to, for example, a drum sound and gates off the sound in the middle of the reverberation, thereby giving a listener an unexpected feeling. In the conventional gate reverb device, the gate time, that is, the time from the start of sounding until the gate is turned off is manually set, or the gate is turned off when the reverberation falls below a predetermined level.

[0003]

In the conventional gate reverb device as described above, since the gate time does not consider the tempo of the music, it is necessary to reset the time and level when the tempo changes. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide an effect adding apparatus in which the above-mentioned problems of the prior art are improved and the gate time is automatically set appropriately according to the tempo of the music.

[0005]

FIG. 1 is a functional block diagram showing an outline of the present invention. The effect adding means 1 adds an effect to the inputted musical tone signal. The gate signal generation means 3 generates a gate signal having a length corresponding to the cycle of the tempo signal, based on the tempo signal of the music inputted from the outside and the note-on signal for controlling the sound generation. The gate means 2 gates the output signal of the effect adding means by the gate signal from the gate signal generating means. As described above, the present invention is, in the effect adding device, an effect adding means for adding an effect to a tone signal, a gate signal generating means for inputting a tempo signal and a tone generation control signal, and generating a gate signal, and the gate signal. Therefore, a gate means for gated the output of the effect adding means is provided.

[0006]

According to the present invention, by such means, the gate is turned on by the tone generation control signal, the tempo signal output from the sequencer or the like generated in a cycle corresponding to the tempo of the music is counted, and the gate time is set. Therefore, it is possible to set the gate time according to the tempo of the music.
Therefore, it is possible to add an appropriate effect to a music piece having an arbitrary tempo.

[0007]

Embodiments of the effect adding device to which the present invention is applied will be described in detail below. FIG. 2 is a block diagram showing the overall configuration of the automatic performance system including the effect adding circuit (reverb device) of the present invention. The MIDI sequencer 5 generates a MIDI signal based on the stored MIDI data of the music. In this MIDI signal, note-on (pronounced,
There are signals such as a chord 9 ×), a note-off (silenced, chord 8 ×) signal, and a timing clock (chord F8) which is a tempo signal output at a rate of 24 per quarter note.

The sound source system 6 receives the MIDI signal,
According to the data, musical tone signals of a plurality of channels are simultaneously generated. By connecting a plurality of sound source systems in parallel and assigning MIDI channels to the respective devices, it is possible to simultaneously generate different musical tones. The reverb device 7 is connected to, for example, a percussion sound source, receives a MIDI signal from a MIDI sequencer, and adds a gate reverb effect to a musical sound. This output is amplified by the amplifier 8 and sounded by the speaker 9.

FIG. 3 is a block diagram showing the internal structure of the reverb device 7 of FIG. The input adjusting volume 10 adjusts the input level. The A / D converter 11 A / D converts the input musical tone signal. The DSP (digital signal processor) 12 is a processor having a high-speed arithmetic function, and performs reverberation addition or gate processing by a certain kind of filter arithmetic processing as described later. The D / A converter 13 converts the output digital musical tone signal of the DSP 12 into D / A.
Convert. The wet level volume 14 adjusts the reverberation level. The dry level volume 15 adjusts the level of only the input signal to which no reverberant sound is added. The adder circuit 16 adds the input signal and the reverberant sound, synthesizes them, and outputs them.

The panel switch 17 comprises a switch and a volume for instructing the reverb device of various modes and parameters, and a display device for displaying the modes and parameters. The MIDI interface 18 receives an asynchronous MIDI serial signal, converts it into parallel data, and transfers it to the CPU. The CPU 19 controls the entire device according to a program stored in the ROM 20, and also performs a process of creating a gate signal from a received MIDI signal as described later. The ROM 20 stores a control program and various data tables. RAM21 is CP
Used as a work area for U. The bus 22 connects each circuit in the device.

Next, the processing of the DSP will be described.
FIG. 4 is a functional block diagram showing the processing contents of the DSP 12. This block diagram shows the gate 4 in the digital filter section.
The digital filter section corresponds to the effect adding means 1 of FIG. 1, and the gate 40 corresponds to the gate means 2. The digital filter unit includes an adder 30 and
A plurality of delay circuits 31, 32, 33 for delaying the output signal of the adder 30 by a delay amount D, a plurality of multipliers 34, 35, 36 for multiplying the output of the delay circuit by a coefficient K, and the outputs of the respective multipliers are added. It comprises a plurality of adders 37, 38 for controlling, and a multiplier 39 for multiplying the added signal by a control parameter T and inputting it to the adder 30 in order to control the amount of circulation. The delay circuit can be configured in series.

In the functional block diagram of FIG. 4, first, the cyclic amount parameter T is set to 0, and the delay amounts D1 to Dn are set to values that increase in order. The smaller the delay amount is, the larger the coefficient K1 to Kn is. If set, gate 40
A reverberation sound is obtained at the input of, but a large amount of delay circuits, multipliers, and adders are required to increase the number and time of reverberations. Therefore, when the cyclic amount parameter T is set in the range of 0 <T <1, the reverberation sound is attenuated by T and circulates to the input side again, and a plurality of reverberation sounds are obtained corresponding to one delay circuit. Therefore, by properly selecting the parameters D, T, and K, reverberant sound having arbitrary characteristics can be obtained. The gate 40 is for gating the output,
The reverberation sound output is multiplied by a gate signal G (having a value of 1 or 0) generated from the CPU 19 by a method described later.

FIG. 5 is a flow chart showing the gate signal generation processing in the CPU 19 of FIG. CPU1
9 is an MI received via the MIDI interface when the device is set to the gate reverb mode.
The DI signal is constantly monitored. In step S1, the MI of the sound source system to which the reverb device is connected
Wait until the note-on signal of the DI channel is received.
In step S2, the CPU 19 sends a gate-on (G = 1) signal to the DSP 12. As a result, the gate 40 in the functional block diagram 4 of the DSP 12 is shown.
Opens, and the reverberant sound is output from the DSP 12. In step S3, a counter for counting tempo signals is reset to 0.

In step S4, the process waits until the timing clock which is the tempo signal is received. Step S
At 5, 1 is added to the tempo signal counting counter. In step S6, it is checked whether or not the value of the counter has reached a predetermined value, and if it has not reached the predetermined value, the process returns to step S4 to continue counting the tempo signal. However, when it reaches the predetermined value, the process proceeds to step S7, and the gate off (G = 0) signal is sent to the DSP 12. This completes the gate reverb processing for one sound, but as shown by the dotted line in FIG.
Goes through step S1 of FIG.
The process is repeated from.

FIG. 6 is a waveform diagram conceptually showing the input and output signals. A tempo signal (timing clock), a note-on signal, a note-off signal, and a tone signal are input to the reverb device from the outside. In the reverb device, when the note-on signal is received, the internal CPU 19 generates the gate-on signal, the reverberation sound is output from the DSP 12, and at the same time, the counting of the tempo signal is started. The output of the adder circuit 16 of FIG.
As shown in (a), the direct sound, the initial reverberation sound, and the rear reverberation sound are sequentially output.

When the reverb device receives a predetermined number of tempo signals, the CPU 19 generates a gate-off signal, and the DSP 1
2 prohibits output of reverberation sound. The number of tempo signals to be counted, that is, the maximum delay time can be set from a panel or the like. When the gate is off, set the digital filter parameters T and K to 0 so as not to affect the next reverberation.
Also reset the filter. Further, a gate controlled by a gate signal may be provided on the input side of the filter and the gate signal G may be used for control.

FIG. 6B shows an example in which the tempo signal is doubled as compared with FIG. 6A, and in this case, the length of the gate signal is half that of FIG. 6A. In this case, if the characteristic of the digital filter is fixed, the delay amount or attenuation characteristic of the reverberation sound may be inappropriate for the tempo. In order to solve such a problem, it is possible to change the characteristics of the filter according to the tempo. For example, always measure the period of the tempo signal,
The parameter D, T, K of the filter can be changed by the value. When the tempo is slow, the parameters D, T, and K are set to large values, and when the tempo is fast, they are set to small values.

Although the embodiment has been described above, the following modifications are also possible. Although an example in which the gate 40 of FIG. 4 is provided is shown as the gate means, the same gate function can be realized by setting all the parameters K to 0, for example. Also DSP
Alternatively, the gate function can be realized by controlling the D / A converter or the adder circuit. Figure 5
In step S1 of step 1, only the note-on signal of a specific MIDI channel may be detected. In this way, when controlling a plurality of sound source systems, it is possible to add the effect only to the MIDI channel of percussion, for example.

The tempo signal is 24 per quarter note.
In addition to the timing clock (chord F8) which is a tempo signal output at a rate of 48, a timing clock (D at a rate of 48 per quarter note) (D
There are various types such as INSYNC), and it is necessary to change the count-up set value of the counter in step S6 of FIG. 5 according to the type of the clock signal.

In the present application, the gate reverb has been described as an embodiment, but the present invention can be applied to various effect adding devices such as vibrato, tremolo, growl, and pan in addition to the gate reverb.

[0021]

As described above, according to the present invention, the output of the effect-added sound such as the reverberation sound is turned on by the note-on signal, and the cycle corresponding to the tempo of the music is output from the sequencer or the like. Since the gate time is set by counting the tempo signal generated in step 2, it is possible to set the gate time according to the tempo of the music in the effect addition device, and add an appropriate effect according to the tempo of the music. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an outline of the present invention.

FIG. 2 is a block diagram showing the configuration of the entire automatic performance system.

FIG. 3 is a block diagram showing an internal configuration of a reverb device 7.

FIG. 4 is a functional block diagram showing processing contents of the DSP 12.

FIG. 5 is a flowchart showing a gate signal generation process.

FIG. 6 is a waveform diagram conceptually showing input and output signals.

[Explanation of symbols]

1 ... Effect adding means, 2 ... Gate means, 3 ... Gate signal generating means, 5 ... MIDI sequencer, 6 ... Sound source system,
7 ... Reverb device, 8 ... Amplifier, 9 ... Speaker

Claims (3)

[Claims] 1. An effect adding means for adding an effect to a musical tone signal, a gate signal generating means for inputting a tempo signal and a tone generation control signal to generate a gate signal having a length corresponding to a cycle of the tempo signal, An effect adding device comprising: a gate unit that opens and closes an output of the effect adding unit by a gate signal. 2. The gate signal generating means turns on the gate signal in response to the tone generation control signal, counts the tempo signal from the time the gate signal is turned on, and outputs the gate signal when the count value reaches a predetermined number. The effect adding device according to claim 1, wherein the effect adding device is turned off. 3. The effect adding device according to claim 1, wherein the effect is addition of reverberation.