JPS5885490A - Tune converter for electric guitar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tone color conversion device that makes the tone colors of an electric guitar diverse.

Hitherto, various methods have been developed to make the tones of electric guitars more diverse. Conventional general electric gear
Since the guitar uses a common pickup to pick up the vibrations of each of the 1st to 6th strings, the vibrations of each string are mixed, making it difficult to play the chords that are characteristic of the guitar.
It is extremely difficult to create J-Noh and have a variety of tones.
#If was 0 Therefore, using a special pickup that picks up the vibration 1j of each string by bending \γ, the envelope signal and the clipped waveform signal by the saturation type amplifier are extracted from the output of each pickup, and the clipped waveform signal is A timbre conversion device for an electric guitar has been proposed in which image width W is adjusted using an envelope signal, and +1# is created so that all the modulated signals of each string are mixed.

However, in such a front color conversion device for an electric guitar, it is not possible to play chords, but the timbre is limited to the clip waveform signal, that is, the sound of the rectangular waveform, and the timbre change is slow. The signal does not necessarily correspond to the fundamental wave of string vibration, so when playing a single note, an octave pitch sound is generated and becomes audible.The duty ratio of the rectangular wave due to the saturated amplifier constant changes depending on the fret position. Because it is stored away, it has drawbacks such as not being able to obtain a pure and constant tone.

The present invention aims to solve the drawbacks of
First, extract only the fundamental wave component from the signal, multiply it by a certain factor, and then select an arbitrary sound source waveform from among the sound mL waveforms prepared in advance based on the multiplied pulse. The object of the present invention is to provide a guitar tone conversion device H that is compatible with water waves and provides a wide variety of tones. Therefore, the electric guitar tone conversion device of the present invention does not vibrate each string independently. a pickup for electrically converting h; a fundamental wave dividing means for extracting the fundamental wave of string vibration from the output of the pickup; a means for multiplying the frequency of the fundamental wave of the chordal motion; a counter that counts the frequency multiplied by the frequency of the vibrating water wave; a memory that stores various sound source waveforms in advance and continuously outputs the sound source waveforms based on the contents of the counter; An envelope follower that extracts the envelope from the output, an M transformer that uses the output of the envelope follower as a control signal to amplitude-modulate the sound source waveform successively output from the memory card, and a rich variety of tones for each string. It is characterized by being able to obtain the following. This will be explained below with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of the electric guitar tone conversion device according to the present invention, and FIG. 2 shows an operational waveform diagram explaining the operation of the pickup signal processing circuit shown in FIG. 1. For example, FIG. 3 shows an operating waveform diagram illustrating the operation of envelope modulation.

In FIG. 1, SL to S6 are the strings of an electric guitar, and pickups Pl to P6 independently pick up the strings 4H1fl+ of each of the strings SL to S6 of an electric guitar, for example, a T1i 6Fi type pickup. 1-1 to 1-6 are pickup signal processing circuits which process the outputs of the respective pickups obtained from the pickups P1 to P6 in the respective pickup processing circuits 1-1 to 1-6; 2
is a fundamental wave extraction circuit, which extracts the string vibration of the electric guitar string S1 from the output of the pickup Pl (lower leg of the electric guitar string S).
, a pickup Pl and a pickup signal processing unit provided corresponding to the low! (explained using 1-1 as a typical example) 3JI'i phase comparator which extracts the fundamental wave component from the human input signal input from the fundamental wave extraction circuit 2 and the counter 6 which will be explained later. 4 is a low-pass filter that constantly compares the phase difference with the input signal input manually, and the human input signal from the fundamental wave extraction circuit 2 inputted to the phase comparison so-called 3 and the input signal inputted from the counter 6. The output voltage of phase comparator 3 caused by the phase difference between
f: Integration and smoothing, 5 is voltage 1IflIυ11
It is an oscillator and is smoothed by the above-mentioned low-pass filter 4 (
4) The oscillation Ii wave plate is determined by the control voltage, 6
is a counter that divides the oscillation 1M wave number oscillated from the voltage control oscillation slide 5 by N and counts the frequency. L (7 aids locked loop) and forms part of the address (lower address) for accessing the memory 7, which will be described next with the contents of the counter 6, which is counted by the counter 6.
7 is a memory that stores one cycle of various sound source waveforms in advance, for example, a ROM is used, and 8 is an envelope 7 oror, which is used for electric guitars. Pick up the string vibration of string SL P! Electricity MI'-N converted to fsk by
9 is a modulator that extracts the envelope of the number, and converts the sound source waveform read from the memory 7 into the envelope voltage (signal) obtained from the envelope 7 oror 8.
10-1 is a sound source waveform changeover switch for changing the address for reading out a desired sound source waveform from among the sound source waveforms stored in the memory 7. , for example, the sound source waveform changeover switch 1
o-1 designates an upper address for the memory 7, and 11 represents a mixer.

As explained above, the phase comparator 3, the low-pass filter 4
, voltage secondary oscillation 'a5, counter 6 digits) I and L. Therefore, jJ: 4: r skin extraction circuit 2
The input signal IJM i? is input to the phase comparator 3 from Since the automatic frequency subtraction is performed so that the number fi and the 1M wave number fs of the human input signal oscillated by the 111-pressure controlled oscillation block 5, processed for N minutes by the counter 6, and inputted to the phase comparator 3 are matched, the above explanation is made. Since the frequency division ratio of the counter 6 is selected as N, fi=fs...................................................[1]fo
-N, fI...[2] holds true.

Here f. ``jM, oppression 6141 oscillation butterfly 5 no ka IM
It represents a wave of defeat.

As is clear from equations [1] and (2), the voltage controlled oscillator 5 outputs an electric signal at the frequency of the Hondo extraction circuit 2, that is, the frequency multiplied by N times the fundamental string vibration of the string 81 of the electric guitar. (pulse) is obtained.

To explain this situation using FIG. 2, it is the output waveform of the pickup P in the figure (A), and the waveform (131) in the figure is obtained by the fundamental wave extraction circuit 2. , now if we choose the division of the counter 6 to be N = 4, as is clear from the above equation [1], a pulse with a frequency multiplied by 4 will be generated. A circuit (not shown) (provided in the counter 6) generates a pulse every half-synchronization of the pulse, that is, every time the pulse falls - eight times as many pulses are generated, and the number of pulses is counted. forms part of the address of memory 7.-f# Genpasugi 17J
A part of the address for reading a desired sound source waveform from among the Kusunoki sound source waveforms that have been memorized with tttl is entered manually from the chivalry switch 10-1, and the sound source waveform clear switch 1
The memory 7 is accessed with an address formed from 0-1 and the count number based on the pulse train multiplied by 4 of the counter 6. Therefore, by changing the content of the upper address manually input to the 1.7J conversion switch 1O-1, the sound source wave (7) can be obtained by
An arbitrary sound source waveform divided into 8 parts for 11 waste periods of the fundamental wave component waveform of the pickup P1 is read out from the memory 7, as shown in FIG.

The various sound source waveforms obtained in this way are sent to the modulator 9, where they are amplitude-modulated by the envelope m pressure obtained by the envelope 7 oror 8, and then the mixer 11 modulates the amplitude of the other electric guitar strings S2 to S6. is combined with the string signal obtained from the mixer 11 and outputted as an output signal from the mixer 11.

FIG. 3 is an operation waveform diagram explaining the operation of envelope modulation, and (A) in the same figure shows the amplitude change of the output waveform of the pickup Pl. FIG. 3C shows the envelope voltage waveform of FIG. 2A obtained by passing the output of the pickup P1 through an envelope and 7 oror 8. The amplitude modulation is performed by the modulator 9 from the waveforms of FIG.

As explained above, according to the present invention, it is possible to generate complex sound source waveforms such as human voice, and it is possible to produce an extremely wide variety of tones, and it is also possible to generate a constant tone regardless of the same wave number. A wide variety of tones can be obtained while playing chords.

Furthermore, by appropriately selecting a combination of the frequency division ratio of the counter and the address for the memory, it is also possible to generate a sound an octave above or an octave below.

[Brief explanation of drawings]

Fig. 1 shows the configuration of an embodiment of the electric guitar tone conversion device according to the present invention, and Fig. 2 shows an operational waveform explaining the operation of the pickup signal processing circuit used in Fig. 1.
For example, FIG. 3 shows an operating waveform diagram illustrating the operation of envelope modulation. 1-1 to 1-6...Pickup signal processing circuit, 2...Fundamental wave extraction circuit, 3...
Phase comparator, 4...Low pass filter, 5.
...Voltage controlled oscillation, 6...Counter,
7...Memory, 8...Envelope
7 oror, 9...Modulator, 1O-1e to 10
-6...Sound source waveform J exchange switch, 11...
...Kingu, 81 or S6...P11L strong strings, Pl or P6...Pickup. Patent Applicant Rico Ichitoki Co., Ltd. Agent Patent Attorney Shunsuke Nakao 1 ()

Claims (1)

[Claims] a pickup that electrically converts string vibration independently for each string; a fundamental wave component extraction means that extracts the fundamental wave of string vibration from the output of the pickup; f stage, and a counter that counts the frequency obtained from the frequency of the fundamental waveform of this string vibration.
A memory that stores the sound source waveform of each building in advance and outputs the sound source waveform 61 times based on the contents of the counter; - an envelope for extracting the envelope from the output of the pickup; 7
Equipped with a modulator that modulates the sound source waveform read from the memory with the output of the oroa as a side signal, and a mixer that arbitrarily combines/M-combines the outputs of the modulators corresponding to each string. ■Featured in all features is a guitar tone conversion device.