JPH0625896U - Effect device - Google Patents

Abstract

(57) [Summary] [Purpose] To generate and output a tone signal that lasts like a feedback performance from a decaying tone signal.
Ensure that the same effect as feedback performance is achieved. [Structure] Input means for inputting musical tone signals, storage means for sequentially storing musical tone signals input by the input means, storage of musical tone signals in the storing means and reading of the musical tone signals stored in the storing means are controlled. Storage means control means, output signal control means for switching the output of the tone signal input by the input means and the tone signal read from the storage means by the storage means control means, and switching of the output by the output signal control means. The musical tone stored in the storage means by the storage means control means and the output signal control means when the instruction means instructs to output the musical tone signal read from the storage means. The signal is repeatedly read and output.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an effect device, and particularly to an effect device suitable for use in a stringed instrument or the like.

[0002]

[Background of device]

 Generally, as one of the string instruments, an electric guitar (electric guitar) used for playing rock music and popular music is known.

As one of the renditions when playing rock music with such an electric guitar, there is a special rendition called a feedback rendition.

The feedback playing method is performed by bringing the electric guitar in the plucked state closer to the speaker of the guitar amplifier that is emitting the sound of the plucked string by the electric guitar. In this way, a feedback loop is formed by the strings of the electric guitar and the speaker and the acoustic space that connects them, and the musical sound output from the speaker is amplified by the guitar amplifier based on the string. , The string is further vibrated at a pitch based on the frequency of the musical sound. For this reason, the vibration of the string started by the string is not attenuated, and the vibration of the string being tuned can be maintained, so that the pronunciation of the musical sound based on the string vibration by the string is also damped. Without being played, the musical tone based on the pitch of the musical tone is maintained.

When the performer performs such a feedback playing method, the pronunciation of the musical tone based on the relevant string is sustained without being attenuated, so that the performance has a very strong impact on the audience. You will be able to give.

[0006]

[Problems to be Solved by the Invention] However, there is a problem in that it is extremely difficult to realize this feedback playing method as intended by the performer.

That is, as described above, in the feedback performance method, the pronunciation of the musical tone having the same pitch as the musical tone produced based on the string of the strings is maintained by the feedback based on the sound output from the speaker. It is a thing. For this purpose, it was necessary to delicately control the method of striking the strings, the timing of bringing the strings closer to the speaker, the distance and direction between the speaker and the string, and the volume of the musical sound produced by the speaker. Therefore, mastering the feedback method requires good technique, abundant experience, and "intuition" and "tips" backed by such technique and experience, and even professional guitarists fail. It was often the case.

In other words, even if an operation for feedback performance is performed in which the struck string is brought closer to the speaker, the string does not vibrate due to the feedback and is immediately attenuated and the musical sound is muted. Even if feedback performance is performed with a tone pitch that is different from the pitch of the tone generated based on it I could not do it.

As described above, the applicant confirmed through experimentation the following causes as a cause of difficulty in performing a feedback performance with a tone having the same pitch as that of a tone based on a string.

That is, in the feedback performance, when a feedback loop including an acoustic space is formed, the string vibration is caused by a frequency component with a large amplitude in the musical sound emitted after being amplified by the guitar amplifier. It is caused by being triggered.

However, a musical tone of a desired pitch generated when a string is struck (in an electric guitar, it is a musical tone of a pitch specified by a player by pressing the string on a fret). , Referred to below as “fundamental”), the musical sound output from the speaker contains non-fundamental frequency components due to non-interval electric signals such as string noise and harmonics generated by the strings. It was supposed to be. Therefore, the fundamental is blocked by frequency components other than the fundamental, and it becomes impossible to induce the vibration of the string based only on the fundamental frequency, and as a result, it becomes difficult to perform the feedback performance. there were.

On the other hand, a non-pitch electric signal such as string noise is attenuated after a predetermined time has elapsed from the time of plucking the string, but the fundamental level is also low at this time, so the fundamental level is low. Also becomes less than the volume required for feedback performance, and the proportion of the secondary harmonics level tends to increase as the fundamental decays, which makes it difficult to perform feedback performance. It was.

Further, in order to realize the feedback rendition style, a considerable volume is actually required. Therefore, in order to actually realize the feedback performance, it was difficult to perform the feedback performance by the feedback performance unless it was performed in a completely soundproof space.

The present invention has been made in view of the above situation, and its purpose is to perform feedback performance from a musical tone signal that attenuates like a musical tone signal based on the string vibration of an electric guitar. By producing and outputting a continuous tone signal as described above, it is intended to provide an effect device capable of reliably achieving the same effect as that of the feedback performance achieved based on the feedback performance style. .

[0015]

[Means for Solving the Problems]

 To achieve the above object, the effect device according to the present invention comprises an input means for inputting a tone signal, a storage means for sequentially storing the tone signals input by the input means, and the tone signal to the storage means. Storage means and means for controlling the reading of the musical tone signal stored in the storing means, the musical tone signal input by the inputting means and the musical tone signal read from the storing means by the storing means controlling means. Output signal control means for switching the output of the output signal and an instruction means for instructing switching of the output by the output signal control means, and the output signal control means is read from the storage means by the instruction means. When an instruction to output a tone signal is issued, the storage means control means repeats and reads the tone signal stored in the storage means. A, the output signal control means is obtained so as to output the musical tone signal read out repeatedly by the storage means control means.

[0016]

[Action]

 The tone signals input from the input means are sequentially stored in the storage means and read out under the control of the storage means control means.

Further, the output signal control means switches and outputs the tone signal input from the input means and the tone signal read from the storage means.

The output signal control means switches the output by the instructing means, and the instructing means instructs the output signal controlling means to output the tone signal read from the storage means. In some cases, the storage means control means repeatedly reads out the tone signals stored in the storage means, and the output signal control means outputs the tone signal repeatedly read out by the storage means control means.

[0019]

【Example】

 Hereinafter, an effect device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of an effect device according to the present invention. In this effect device, an input terminal 10 is connected to an output terminal of an electric guitar (not shown), and an output terminal 12 is shown. Not connected to the input terminal of a guitar amp and used between the electric guitar and the guitar amp. Therefore, the input signal based on the string vibration of the string of the electric guitar is input through the input terminal 10, subjected to the predetermined processing described later, and then output through the output terminal 12 to the guitar amplifier. Then, the musical sound based on the string of the strings is emitted from the speaker of the guitar amplifier.

This effect device is configured to control the entire operation thereof by using the microcomputer 14, and amplifies the analog signal input from the input terminal 10 by the string of an electric guitar. An amplifier 16, an A / D converter 18 for converting an analog signal amplified by the amplifier 16 into a digital signal (analog / digital), and a digital signal converted by the A / D converter 18 are input and described later. Outputs from a digital signal processor (DSP) 20 that performs a predetermined process, a digital signal output from the DSP 20 to an analog signal (digital / analog) D / A converter 22, and a D / A converter 22 And an amplifier 24 that amplifies the analog signal and outputs the amplified analog signal to the output terminal 12.

Further, the effect device is provided with a pitch detection unit 26 for detecting the pitch of the output signal of the amplifier 16, and the pitch data detected by the pitch detection unit 26 is loaded into the micro computer 14, The DSP 20 is controlled based on the detection result of the pitch detection unit 26.

The effect device is turned on when performing a performance having the same effect as the feedback performance by the feedback rendition style (hereinafter referred to as “desired performance”), and turned off when the desired performance is not performed. A feedback generation switch unit 28 is provided. The operation unit of the feedback generation switch unit 28 is composed of a foot switch or the like.

The DSP 20 is configured so that control of the entire operation is controlled by the control unit 30, and a ring memory 32 for sequentially storing the tone signals output from the A / D converter 18 in a ring shape and a ring memory 32. A memory control unit 34 for controlling the reading of the tone signal stored in the ring memory 32, an input signal level control unit 36 for controlling the level of the tone signal output from the A / D converter 18, and a ring. A read signal level control section 38 for controlling the level of the tone signal read from the memory 32, and a cross fade (the output level of one of the input signal level control section 36 and the read signal level control section 38 is gradually reduced. And a cross fade generating section 40 for controlling the other output level to be gradually increased). An attenuation envelope applying section 42 for applying an attenuation envelope to the output signal from the read signal level control section 38 controlled by the fade generating section 40, and an attenuation envelope applied by the attenuation envelope applying section 42. An attenuation envelope generating section 44, an adder 46 for adding the outputs of the input signal level control section 36 and the attenuation envelope applying section 42 and outputting the result to the D / A converter 22 are provided.

In the ring memory 32 described above, the latest waveform data is sequentially written in a ring shape in accordance with the input signal based on the string of the electric guitar. Under the control of the memory control unit 34, the latest stored waveform data can be read repeatedly at all times.

In the above configuration, when switching from the normal performance only by the output of the input signal level control unit 36 to the desired performance, the strings of the electric guitar are struck to generate musical tones, and the desired performance is performed. The feedback generation switch unit 28 is turned on at the desired timing.

When the feedback generation switch section 28 is turned on in this manner, the pitch detection section 26 analyzes the pitch of the input signal based on the string. Then, according to the analysis result, the memory control unit 34 extracts the data for one wavelength in the ring memory 32 based on the pitch of the input signal.

Here, to extract the waveform data for one wavelength means to specify the waveform data for one wavelength in the ring memory 32 based on the detection result of the pitch detection unit 26, and to perform the loop reading. This means that continuous output is obtained by repeatedly outputting.

That is, from the waveform data of a plurality of cycles stored in the ring-shaped storage area of the ring memory 32, the start address (loop start address) and the end address (loop start address) of the waveform data corresponding to one wavelength are stored. Loop end address), and the data in between are repeatedly read.

A known technique can be used to detect the loop start address and the loop end address. For example, as disclosed in Japanese Patent Laid-Open No. 62-139588 and Japanese Patent Laid-Open No. 2-137897, a method of finding a loop point for loop reading may be used.

The detection result of the pitch detection unit 26 is used for setting the looping section.

In this way, the waveform data for one wavelength extracted from the ring memory 32 is loop-read, that is, repeatedly read and output.

At this time, the cross fade generation section 40 controls the input signal level control section 36 and the read signal level control section 38 to gradually reduce the output level of the input signal, and The output level of the data for one wavelength that is repeatedly read is gradually increased so that a natural cross fade is performed.

It should be noted that when the feedback generation switch section 28 is turned on, the attenuation envelope applying section 42 and the attenuation envelope generating section 44 are not operated. Therefore, the output from the read signal level control unit 38 and the output from the input signal level control unit 36 which are not provided with the attenuation envelope are added by the adder 46 and output. Therefore, the output signal output from the output terminal 12 switches from the output of the input signal level control unit 36 to the output of the read signal level control unit 38 while cross-fading.

[0035] For example, as shown in FIG. 2, when turned on feedback generation switch at time t _1, the output of the input signal level control unit 36 from the time t ₁ is decreasing and monitor, the read signal level control unit 38 While the output gradually increases and cross-fades, the output signal output from the output terminal 12 switches from the output of the input signal level control unit 36 to the output of the read signal level control unit 38.

Therefore, a tone signal having the same pitch and tone color as the input signal when the feedback generation switch unit 28 is turned on is continuously output to the output terminal 12. Therefore, the generation of the musical tone having the same pitch and tone color as the musical tone based on the input signal when the feedback generation switch unit 28 is turned on is maintained, and the same effect as that obtained by the feedback performance by the feedback performance method is obtained. You can

On the other hand, when the feedback generation switch unit 28 is turned off to turn the feedback generation switch unit 28 from the ON state to the OFF state, the attenuation envelope generating unit 44 generates the attenuation envelope and the attenuation envelope applying unit 42. At, the attenuation envelope is added to the output of the read signal level control unit 38, and the reading of the ring memory 32 is stopped. Then, after reaching the set attenuation rate, the output level of the input signal level control section 36 is gradually increased by the cross fade to return to the normal playing state.

That is, as shown in FIG. 2, when the feedback generation switch unit 28 is turned off at time t ₂ , the attenuation envelope is given to the output of the read signal level control unit 38. Then, when the output of the read signal level control unit 38 reaches a predetermined attenuation rate, the output level of the input signal level control unit 36 is gradually increased to cause cross fading, while only the output of the input signal level control unit 36 is output. To return to the normal playing condition.

Therefore, in the above embodiment, the same result as the result obtained by the feedback performance based on the feedback rendition can be electronically reproduced by using the digital signal processing. That is, the input signal is stored in the ring memory 32 that sequentially stores the latest waveform data. When a feedback generation request is made by turning on the feedback generation switch unit 28, the input signal is cross-faded with the ring signal. The waveform data in the memory 32 is repeatedly read and output.

As a result, a tone signal having the same pitch and tone color as the input signal when the feedback generation is requested by the ON operation of the feedback generation switch unit 28 is continuously output, and the same result as the result obtained by the feedback rendition style is obtained. It is something that can be realized.

Therefore, by using this method, the same result as that obtained by the feedback rendition can be surely obtained by a simple switch operation, so that even a beginner can easily simulate the feedback rendition. Becomes

Further, since the effect can be obtained at an arbitrary volume, the feedback rendition can be performed without causing a problem in a soundproof space for realizing the effect.

[0043]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects.

Input means for inputting musical tone signals, storage means for sequentially storing the musical tone signals input by the input means, storage of the musical tone signals in the storage means, and the storage means stored in the storage means. Storage means control means for controlling the reading of the musical tone signal, and output signal control means for switching the output of the musical tone signal input by the inputting means and the musical tone signal read from the storage means by the storing means control means. When the output signal control means instructs the output signal control means to output the tone signal read from the storage means. In addition, the storage means control means repeatedly reads out the tone signals stored in the storage means, and the output signal control means operates in the storage means. Since the tone signal repeatedly read by the stage control means is output, the tone signals input from the input means are sequentially stored in the storage means and read out under the control of the storage means control means. Will be able to.

On the other hand, the output signal control means switches and outputs the tone signal input from the input means and the tone signal read from the storage means.

Then, the switching of the output by the output signal control means is performed by the instructing means, and the instructing means instructs the output signal controlling means to output the tone signal read from the storage means. In some cases, the storage means control means repeatedly reads out the tone signals stored in the storage means, and the output signal control means outputs the tone signal repeatedly read out by the storage means control means.

Therefore, according to the present invention, it is possible to generate and output a musical tone signal that lasts like feedback performance from a musical tone signal that attenuates, such as a musical tone signal based on string vibration of an electric guitar. It will be possible to surely achieve the same effect as the feedback performance achieved based on the above.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an effect device according to the present invention.

FIG. 2 is a timing chart showing an operation example of the effect device.

[Explanation of symbols]

 10 input terminal 12 output terminal 14 microcomputer 16 amplifier 18 A / D converter 20 DSP 22 D / A converter 24 amplifier 26 pitch detection unit 28 feedback generation switch unit 30 control unit 32 ring memory 34 memory control unit 36 input Signal level controller 38 Read signal level controller 40 Cross fade generator 42 Attenuation envelope generator 44 Attenuation envelope generator 46 Adder

Claims (1)

[Scope of utility model registration request] 1. Input means for inputting a tone signal, storage means for sequentially storing tone signals input by said input means, storage of said tone signal in said storage means and said storage means stored therein. Storage means control means for controlling the reading of the musical tone signal; output signal control means for switching the output of the musical tone signal input by the input means and the musical tone signal read from the storage means by the storage means controlling means; And an instruction means for instructing switching of the output by the output signal control means, wherein the instruction means instructs the output signal control means to output the tone signal read from the storage means, The storage means control means repeatedly reads out the tone signal stored in the storage means, and the output signal control means operates by the storage means. Effect device being characterized in that so as to output the musical tone signal repeatedly read out by the control means.