JP3739057B2 - Sound effect generator - 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

[0001]
[Industrial application fields]
The present invention relates to a sound effect generating device that generates a sound effect signal by changing a predetermined physical quantity of an audio signal by a control amount corresponding to an operation.
[0002]
[Prior art]
The music played at the disco is called so-called dance music suitable for dancing, but even with such dance music, it is difficult and unfavorable to change the tempo for each dance music. On the other hand, for the reason that the tempo does not change, continuing to play the same song endlessly detracts from interest in dance. Therefore, an editor (disc jockey; DJ) who edits dance music at a disco continues to the current song (first song) and continues to the next song (second song) via the editing mixer. A plurality of (for example, two) disc players are prepared. While one player plays the first song, the other player cues the next song (second song) and controls the rotation speed of the other player's disc to match the playing speed. The reproduction of the second music is started by the other player when the reproduction of the first music is completed.
[0003]
When the disc rotation speed of the other disc player is changed to match the playback speed of the first song and the second song, the pitch (sound pitch) of the song played from the other disc player is rotated. It changes with respect to the original sound as much as the speed changes. Therefore, normally, the mixer is provided with a pitch control means so as to cancel the change in the pitch accompanying the change in the rotation speed. This configuration is disclosed, for example, in Japanese Patent Application No. 5-146405.
[0004]
[Problems to be solved by the invention]
By the way, the mixer is provided with an effect function for generating sound effects during editing. This effect function includes, for example, a delay function that delays the playback sound and a key control function that changes the key (tone) of the playback sound. By using these functions, the original sound recorded on the disc is Different sounds can be output as sound effects.
[0005]
Since there is no essential difference between the control contents of the key control and the pitch control, it is advantageous if the components can be shared. However, since the pitch control cancels out the change in the pitch accompanying the change in the disk rotation speed, accuracy (about 1% unit) of the rotation speed change rate is required, but one key control is originally Since it is intended to change the tone and is also used in the mixer to generate sound effects, it is sufficient if it can be adjusted in semitone units (about 10% units) at most. In addition, the movable range of the adjustment volume is limited, so if the key change rate is set for the key control with respect to the rotation angle of the adjustment volume, it is sufficient for the change rate at 10% or less that requires fine adjustment. The accuracy is not taken. Conversely, when a sufficient adjustment range is set for a change rate of 10% or less, there is a problem that it is impossible to secure a change rate necessary for key control.
[0006]
Accordingly, an object of the present invention is to provide a sound effect generating device capable of performing a plurality of sound effect controls such as key control and pitch control by a single operator.
[0007]
[Means for Solving the Problems]
The sound effect generating device according to the present invention includes an operation input means for generating an operation position signal of a level proportional to the position of a single operation element movable within a predetermined range, and a first function according to the operation of the selection switch. Selection means for selecting one of the first sound effect control and the second sound effect control, and a linear data table for the first sound effect control with a constant rate of change of the control amount with respect to the operation position signal level And a memory storing a second non-linear data table for controlling the second sound effect, the change rate of the control amount with respect to the operation position signal level being different from each other when the operation position signal level is less than or equal to the predetermined level and greater than the predetermined level, Conversion that reads a control amount corresponding to the operation position signal level from the data table of the memory corresponding to the selected one sound effect control and outputs the read control amount as control data And stage, and means for outputting a sound effect signal is varied depending on the control data of physical quantity corresponding to the sound effect control of one of the input audio signal, the predetermined level of the operating position signal level in non-linear data table The change rate of the control amount at the large level and the change rate of the control amount at the predetermined level or less are constant, and the change rate of the control amount at the level greater than the predetermined level is greater than the change rate of the control amount at the predetermined level or less. It is a feature.
[0009]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a sound effect generator according to an embodiment of the present invention. In this sound effect generator, an analog audio signal is supplied to a DSP (digital signal processor) 2 via an A / D converter 1. The DSP 2 cooperates with an externally connected delay RAM (random access memory) 3, adds a sound effect signal to the digital audio signal supplied from the A / D converter 1, and supplies it to the D / A converter 4. To do. The operation of the DSP 2 is controlled by the microcomputer 5.
[0010]
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 effect among a plurality of effects. The display 7 displays the delay time (ms) and the key control amount (%) in response 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 and a key control amount, and allows an adjustment operation by the user. A voltage Vcc is applied between the 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 has a value of 0-100.
[0011]
Further, a ROM 10 is connected to the microcomputer 5. The ROM 10 is necessary for delay processing in addition to a DSP program for causing the DSP 2 to perform a plurality of effect processing such as delay processing and key control processing. A data table is stored such as a delay time data table in which various delay time data is associated with volume position data, and a key control data table in which key control data necessary for key control processing is associated with volume position data. Therefore, when the microcomputer 5 reads the delay DSP program and supplies it to the DSP 2 and also reads the delay time data and supplies it to the DSP 2, the DSP 2 delays the audio signal by the time indicated by the delay time data in accordance with the delay DSP program. Performs delay processing. When the DSP program for key control is read and supplied to the DSP 2 and the key control data is read and supplied to the DSP 2, the DSP 2 changes the key of the audio signal according to the change rate indicated by the key control data according to the DSP program for key control. The key control processing operation is performed.
[0012]
The microcomputer 5 operates as follows for effect control. As shown in FIG. 2, first, the selection effect by the effect selection switch 6 is read as data (step S1), and it is determined whether or not the read selection effect is a delay (step S2). If it is determined that there is a delay, the delay DSP program is read from the ROM 10 and transferred to the DSP 2 (step S3).
[0013]
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 read from the delay time table (step S4). Step S5). As described above, since the delay time data table indicating the delay time data corresponding to each volume position data is formed in the ROM 10 as shown in FIG. 3, the delay time data is selectively read from this delay time data table. It is. The microcomputer 5 transfers the read delay time data to the DSP 2 and the display 7 (step S6). As a result, the DSP 2 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 a delay time.
[0014]
After executing step S6, the microcomputer 5 determines whether or not the effect selection switch 6 has been operated (step S7). If the effect selection switch 6 has not been operated, the process returns to step S4 and operates so as to correspond to the case where the variable resistor 9 has been 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.
[0015]
If it is determined in step S2 that the read selection effect is not a delay, it is determined whether or not the read selection effect is a key control (step S8). When the key control is determined, the key control DSP program is read from the ROM and transferred to the DSP 2 (step S9).
[0016]
After execution of step S9, 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 read from the key control data table. (Step S11). Since the ROM 10 has a key control data table indicating the rate of change corresponding to each volume position data as shown in FIG. 4, the key control data is selectively read from the key control data table. The microcomputer 5 transfers the read key control data to the DSP 2 and the display device 7 (step S12). As a result, the DSP 2 performs a key control process for changing the key by the rate of change indicated by the transferred key control data for the audio signal supplied from the A / D converter 1. The 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, thereby changing the frequency of the audio signal as a whole. As a result, the key of the reproduced sound can be changed with respect to the original sound. When the key is lowered, the reading cycle is made longer than the writing cycle for each sample of the audio signal data, and when the key is raised, the reading cycle is made shorter than the writing cycle for each sample of the audio signal data. Therefore, the key control data is data that determines the reading cycle. The display unit 7 displays the key control amount.
[0017]
In the key control, the key change rate is a linear change from 0% to 10% in the first half operation range of the variable resistor 9 in which the volume position data is 0 to 50 as shown in FIG. In the second half operation range of the variable resistor 9 where the data is 50 to 100, the key change rate is a substantially linear change from 10% to 100%. As can be seen from the above, since the key change rate is smaller for the same operation change amount in the first half operation range of the variable resistor 9 than in the second half operation range, the key change rate can be set finely. It can function as a control.
[0018]
After executing step S12, the microcomputer 5 determines whether or not the effect selection switch 6 has been operated as in step S7 (step S13). When 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.
[0019]
If it is determined in step S8 that the read selection effect is not a key control, it is determined whether or not the read selection effect is another effect such as an echo (step S14). If it is discriminated from another effect, the process proceeds to the control operation (step S15) of the other effect. This is performed in the same manner as the above-described operations in steps S3 to S6 or steps S9 to S12. When the control operation of other effects 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.
[0020]
In the above-described embodiment, the predetermined physical quantity is used as a key for the reproduction sound of the audio signal. For example, the delay time, level, or phase of the audio signal can be changed. Although the delay and key control are shown as effects, other effects such as a compressor may be added.
In the above-described embodiment, the change rate of the control amount when the operation position signal level proportional to the position of the single operation element of the operation input means is equal to or lower than the predetermined level is the operation rate signal level greater than the predetermined level. The change rate of the control amount when the operation position signal level is greater than the predetermined level is the change rate of the control amount when the operation position signal level is less than the predetermined level. It can also be greater than the rate of change.
[0021]
【The invention's effect】
In the sound effect generating device of the present invention, an operation position signal proportional to the position of a single operator of the operation input means is generated, and one sound effect is selected from a plurality of sound effect controls in accordance with the operation of the selection switch. Select control and obtain control data indicating the control amount according to the operation position signal level from the selected sound effect control data table, and change the predetermined physical quantity of the input audio signal according to the control data Since the sound effect signal is generated , the control amount can be easily and finely set by operating the same operator. Therefore, in the sound effect generation control such as pitch control and 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 the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention.
FIG. 2 is a flowchart showing the operation of the 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 main part codes]
2 DSP
5 Microcomputer 6 Effect selection switch 9 Variable resistor

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;
Selecting means for selecting any one of the sound effect control of the key control and other sound effect controls according to the operation of the selection switch;
A linear data table for controlling the other sound effects having a constant rate of change of the control amount with respect to the operation position signal level, a rate of change of the control amount with respect to the operation position signal level being equal to or less than a predetermined level of the operation position signal level, and A memory storing a non-linear data table for key control different from each other by greater than a predetermined level;
Conversion means for reading a control amount corresponding to the operation position signal level from the data table of the memory corresponding to the first sound effect control selected by the selection means, and outputting the read control amount as control data;
Means for changing a physical quantity corresponding to the first sound effect control of the input audio signal according to the control data and outputting it as a sound effect signal ;
In the non-linear data table, the change rate of the control amount when the operation position signal level is greater than the predetermined level and the change rate of the control amount when the operation position signal level is lower than the predetermined level are each constant, and the change rate when the operation position signal level is greater than the predetermined level. An effect sound generating device, wherein a change rate of a control amount is larger than a change rate of the control amount at the predetermined level or less .

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