JPH08202362A - Effect sound generating device - Google Patents

Abstract

PURPOSE: To attain plural effect sound control by single operation by changing the rate of change in a control amount when an operation position signal level is a prescribed level or below with the rate of change in the control amount when the prescribed level or above. CONSTITUTION: Since a key control data table showing the rate of change corresponding to respective volume position data is formed in a ROM 10, the key control data are read out of the data table selectively. A microcomputer 5 transfers the read data to a DSP 2 and a display device 7. Thus, the DSP 2 performs key control processing changing a key by the rate of change shown by the transferred control data for an audio signal supplied from an A/D converter 1. The DSP 2 writes the audio signal data supplied from the converter 1 in a RAM 3 for delay successively in order of sample, and the audio signal is read out at a speed different from the speed of write. Thus, a frequency is changed wholly, and the key of a reproducing sound is changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound effect generating apparatus for generating a sound effect signal by changing a predetermined physical quantity of an audio signal by a control amount according to an operation.

[0002]

2. Description of the Related Art Music played in a disco is so-called dance music suitable for dancing, but even in such dance music, it is not preferable that the tempo changes for each dance music because it is difficult to dance. On the other hand, playing the same song endlessly for the reason of not changing the tempo will detract from interest in dance. Therefore, an editor (disc jockey; DJ) who edits dance music at a disco continuously connects the currently playing song (first song) to the next song (second song) via a mixer for editing. A plurality of disc players (for example, two disc players) are prepared so as to be connected to each of the songs. First by one player
Next song (second song) on the other player while playing
The playback speed of the other player's disc is controlled to match the playback speed, and when the playback of the first song ends, the other player starts playing the second song. To be done.

When the disc rotation speed of the other disc player is changed in order to match the reproduction speeds of the first and second songs, the pitch (pitch) of the song reproduced from the other disc player. Changes with respect to the original sound as much as the rotation speed changes. Therefore, usually, the mixer is provided with a pitch control means so as to cancel out a change in pitch due to a change in rotation speed. Regarding this configuration, for example, Japanese Patent Application No. 5-146
No. 405 publication.

[0004]

By the way, the mixer is provided with an effect function for generating a sound effect at the time of editing. This effect function has, for example, a delay function for delaying the reproduced sound and a key control function for changing the key (tone) of the reproduced sound. By using these functions, the original sound recorded on the disc Different sounds can be output as sound effects.

Since there is essentially no difference in the control contents between the key control and the pitch control, it would be convenient if the components could be shared. However, since the pitch control cancels out the pitch change due to the change in the disc rotation speed, the accuracy (about 1% unit) of the change rate of the rotation speed is required, but one of the key controls is originally The purpose is to change the tone, and it is also used in mixers to generate sound effects.
It is sufficient if there is an accuracy that can be adjusted in units of 0%.
In addition, the movable range of the adjusting volume is finite,
If the setting of the change rate of the key with respect to the rotation angle of the adjusting volume is adjusted for the key control, sufficient accuracy cannot be obtained for the change rate of 10% or less which requires fine adjustment. On the contrary, if the configuration is such that a sufficient adjustment range is set for a change rate of 10% or less, there is a problem in that it is impossible to secure the change rate necessary for the key control.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sound effect generator capable of performing a plurality of sound effect controls such as key control and pitch control with a single operator.

[0007]

A sound effect generator according to the present invention comprises an operation input means for generating an operation position signal of a level proportional to the position of a single operator movable within a predetermined range. , A sound effect generation comprising a conversion means for outputting control data indicating a control amount according to the operation position signal level, and a means for changing a predetermined physical quantity of the input audio signal according to the control data and outputting it as a sound effect signal. In the device, the conversion means makes the rate of change of the control amount when the operation position signal level is equal to or lower than a predetermined level and the rate of change of the control amount when the operation position signal level is higher than the predetermined level. It is characterized by that.

[0008]

According to the present invention, when the operation position signal level proportional to the position of a single operator of the operation input means is below a predetermined level, the change rate of the control amount and the operation position signal level are higher than the predetermined level. Since the rate of change of the control amount is different from each other, it is possible to easily and finely set the control amount for controlling the predetermined physical amount of the audio signal by operating the same operator.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a sound effect generating apparatus which is an embodiment of the present invention. In this sound effect generator,
The analog audio signal is converted to DS via the A / D converter 1.
It is supplied to P (digital signal processor) 2. DS
P2 cooperates with an externally connected delay RAM (random access memory) 3 to add a sound effect signal to the digital audio signal supplied from the A / D converter 1 to perform D /
It is supplied to the A converter 4. The operation of the DSP 2 is controlled by the microcomputer 5.

An effect selection switch 6, a display 7 and an A / D converter 8 are connected to the microcomputer 5. The effect selection switch 6 is a switch for the user to specify one of a plurality of effects. The display 7 displays the delay time (ms) and the key control amount (%) according to a command from the microcomputer 5. The A / D converter 8 supplies the output voltage of the variable resistor 9 to the microcomputer 5 as digital data. The variable resistor 9 is a volume for designating an effect amount such as a delay amount or a key control amount, and allows a user to make an adjustment operation. A voltage Vcc is applied between both fixed ends of the variable resistor 9, and the voltage output from the movable end is digitized by the A / D converter 8 as volume position data and supplied to the microcomputer 5. The volume position data indicating the position of the operator of the variable resistor 9 indicates a value of 0-100.

The microcomputer 5 further includes a ROM
10 is connected to the ROM 10, and in addition to the DSP program for causing the DSP 2 to perform a plurality of effect processes such as a delay process and a key control process,
A data table such as a delay time data table in which delay time data necessary for delay processing is associated with volume position data and a key control data table in which key control data required for key control processing is associated with volume position data Is remembered. Therefore, the microcomputer 5 is a delay DS
When the P program is read and supplied to the DSP2 and the delay time data is read and supplied to the DSP2, DS
P2 performs a delay processing operation of delaying the audio signal by the time indicated by the delay time data according to the delay DSP program. Also, D for key control
When the SP program is read and supplied to the DSP2 and the key control data is read and supplied to the DSP2, the DSP2 changes the key of the audio signal by the change rate indicated in the key control data according to the key control DSP program. Do.

The microcomputer 5 operates as follows for effect control. As shown in FIG. 2, first, the selected effect by the effect selection switch 6 is read as data (step S1), and it is determined whether the read selected effect is a delay (step S2). If it is determined to be a delay, the delay DSP program is read from the ROM 10 and transferred to the DSP 2 (step S3).

After execution of step S3, the volume position data which is the output value of the variable resistor 9 is read from the output of the A / D converter 8 (step S4), and the delay time data corresponding to the volume position data is stored in the delay time table. Is read from (step S5). As described above, since the ROM 10 is formed with the delay time data table showing the delay time data corresponding to each volume position data as shown in FIG. 3, the delay time data is selectively read from this delay time data table. Be done. The microcomputer 5 transfers the read delay time data to the DSP 2 and the display 7 (step S6). As a result, DSP2
Performs delay processing for delaying the audio signal supplied from the A / D converter 1 by the time indicated by the transferred delay time data. Further, the display unit 7 displays the delay time.

After executing step S6, the microcomputer 5 determines whether or not the effect selection switch 6 has been operated (step S7). Effect selection switch 6
If is not operated, the process returns to step S4 to operate so as to correspond to the case where the variable resistor 9 is further adjusted. On the other hand, if it is determined that the effect selection switch 6 has been operated, the process returns to step S1 to read a new selected effect.

If it is determined in step S2 that the read selection effect is not a delay, it is determined whether the read selection effect is a key control (step S8). If the key control is determined, the key control DSP program is read from the ROM and transferred to the DSP 2 (step S9).

After step S9 is executed, the volume position data which is the output value of the variable resistor 9 is read from the output of the A / D converter 8 (step S10), and the key control data corresponding to the volume position data is set as the key control data. It is read from the table (step S11).
As shown in FIG. 4, the ROM 10 is formed with a key control data table showing the rate of change corresponding to each volume position data, so that the key control data is selectively read from this key control data table. The microcomputer 5 transfers the read key control data to the DSP 2 and the display 7 (step S12). As a result, the DSP 2 performs the key control process for changing the key for the audio signal supplied from the A / D converter 1 by the change rate indicated by the transferred key control data. DSP
2 sequentially writes the audio signal data supplied from the A / D converter 1 to the delay RAM 3 in the order of samples, and reads the audio signal data at a speed different from the writing speed, whereby the frequency of the audio signal changes as a whole. In this way, the key of the reproduced sound can be changed with respect to the original sound. When the key is lowered, the read cycle is made longer than the write cycle for each sample of audio signal data, and when the key is raised, the read cycle is made shorter than the write cycle for each sample of audio signal data. Therefore, the key control data is data that determines the read cycle. The amount of key control is displayed on the display unit 7.

In the key control, as shown in FIG. 4, the key change rate is a linear change from 0% to 10% in the first half operation range of the variable resistor 9 where the volume position data is from 0 to 50. In the latter half operation range of the variable resistor 9 where the volume position data is 50 to 100, the key change rate is a substantially linear change from 10% to 100%. As can be seen from this, the variable resistor 9
In the first half of the operation range, the key change rate is smaller for the same operation change amount than in the second half of the operation range, so that the key change rate can be set finely and the function as pitch control can be performed.

The microcomputer 5 executes step S12.
After execution of step S7, it is determined whether or not the effect selection switch 6 has been operated as in step S7 (step S13).
If the effect selection switch 6 has not been operated, the process returns to step S10 and operates so as to correspond to the case where the variable resistor 9 is further adjusted. On the other hand, if it is determined that the effect selection switch 6 has been operated, the process returns to step S1 to read a new selected effect.

When it is determined in step S8 that the read selection effect is not the key control, it is determined whether the read selection effect is another effect such as echo (step S14). If it is determined that the effect is another effect, the process proceeds to the control operation for another effect (step S15). This is performed in the same manner as the operation of steps S3 to S6 or steps S9 to S12 described above. When the control operation of the other effect is completed, it is determined whether or not the effect selection switch 6 has been operated (step S16). If the effect selection switch 6 has not been operated, the process returns to step S15. If it is determined that the effect selection switch 6 has been operated, the process returns to step S1 to read a new selected effect.

In the above embodiment, the predetermined physical quantity is used as the key of the reproduced sound of the audio signal.
For example, the delay time, level, or phase of the audio signal can be changed. Further, although the delay and the key control are shown as the effects, other effects such as a compressor may be added. Further, in the above-described embodiment, the rate of change of the control amount when the operation position signal level proportional to the position of the single operator of the operation input means is equal to or lower than the predetermined level is larger than the predetermined level. Is smaller than the change rate of the control amount when the operation position signal level is less than a predetermined level, the change rate of the control amount when the operation position signal level is less than or equal to a predetermined level It can be greater than the rate of change.

[0021]

In the sound effect generating apparatus of the present invention, the change rate of the control amount and the operation position signal when the operation position signal level proportional to the position of the single operator of the operation input means is below a predetermined level. Since the rate of change of the control amount when the level is higher than the predetermined level is different from each other, the control data indicating the control amount corresponding to the operation position signal level is obtained, and the predetermined physical amount of the input audio signal is set to the control data. By generating the sound effect signal by changing the control amount in accordance with, the control amount can be easily and finely set by operating the same operator. Therefore, in the sound effect generation control such as the pitch control and the key control, a single operator can be used, and for example, the space of the operation panel of the mixer device can be saved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

2 is a flowchart showing the operation of a microcomputer in the apparatus of FIG.

FIG. 3 is a volume position-delay time characteristic stored as a delay time data table.

FIG. 4 is a volume position-key control amount characteristic stored as a key control data table.

[Explanation of symbols for main parts]

 2 DSP 5 Microcomputer 6 Effect selection switch 9 Variable resistor

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Claims (2)

[Claims] 1. An operation input means for generating an operation position signal of a level proportional to the position of a single operator movable within a predetermined range, and a control amount according to the operation position signal level. A sound effect generation device comprising: a conversion unit that outputs control data; and a unit that changes a predetermined physical quantity of an input audio signal according to the control data and outputs the sound signal as a sound effect signal. An effect characterized in that the rate of change of the control amount when the position signal level is equal to or lower than a predetermined level and the rate of change of the control amount when the operation position signal level is higher than a predetermined level are made different from each other. Sound generator. 2. The sound effect generating apparatus according to claim 1, wherein the predetermined physical quantity is a key of a reproduced sound of the audio signal.