JPS623836Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pickup device for an electric musical instrument.

A long pick-up using a piezoelectric material has already been proposed as a pick-up for an electric musical instrument.
This is because good conductor electrodes are used to reduce signal loss, so when the output signal is passed through a filter to create a signal with the desired tone color, a difference in volume will occur between the bass and treble ranges. For example, in order to obtain a musical tone signal with a round tone, if the output signal of a pickup is passed through a low-pass filter, the high-order harmonics of the low-frequency output signal will be blocked and a round tone signal will be obtained. In the output signal in the high frequency range, not only the harmonic components but also the fundamental tone signal are blocked, resulting in a decrease in volume. Conversely, if you pass the output signal through a high-pass filter to obtain a musical tone signal with a hard tone, the low frequency components of the high-frequency output signal will be blocked and a hard tone signal will be obtained, but the low-frequency components will be blocked. The volume of the output signal decreases because even the fundamental tone signal is blocked. Therefore, in this type of pickup, it has been extremely difficult to obtain a musical tone signal with a desired timbre and balanced volume from the bass to the treble range.

The object of the present invention is to provide a pick-up device for an electric musical instrument, which eliminates the drawbacks of conventional long pick-ups and can obtain a musical tone signal of a desired tone with balanced volume from the low range to the high range. Then, one electrode P ₂ or P 3 of a long pick-up P common to a plurality of strings using a piezoelectric material is formed of a low conductive material, and the electrode P ₂ or P ₃ on the side corresponding to the string in the treble range is formed from a low conductive material. Connect the end of _{P 3} to a low-pass filter, and connect the electrode P ₂ or P ₃ on the side corresponding to the bass strings.
The end of the filter is connected to a high-pass filter.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the pick-up p of the present invention is interposed between a frame f and a string receiving member h that supports strings s. This pick-up is an elastic piezoelectric material.
The elastic piezoelectric material p ₁ , which consists of p 1 and band-shaped electrodes p ₂ and p ₃ provided above and below _it , is made by mixing ceramic piezoelectric material powder into rubber or other polymer material, molding it, and vulcanizing or crosslinking it. A voltage of ~70000V is applied between electrodes p ₂ and p ₃ to perform polarization treatment.
One of p ₂ and p ₃ is formed of a low conductive material, such as a material having a resistance of 1 MΩ/m, such as a mixture of conductive rubber and an insulator, and the other is formed of a highly conductive material.

FIG. 2 is a circuit diagram of the pick-up device of the present invention using the pick _- up shown in _FIG . One end, that is, the end y of the side corresponding to the high-pitched string s, is connected to the low-pass filter LF via an amplifier a, and the other end of the electrode _p2 , that is, the end x of the side corresponding to the low-pitched string s, is connected to the low-pass filter LF via the amplifier a. It was connected to a high pass filter HF via amplifier a.

FIG _. 3 shows _an equivalent circuit _of the pick-up p _shown in FIG _.
The internal resistances of V ₁ , V _{2 ,} .

Thus, let us now assume that a hard sound is extracted from the pick-up device. First, the highest note (1760
Hz) When you strike the string s, the pick-up p electrode
A voltage (fundamental wave) of V _o [V] is generated at p ₂ ,
This voltage V _o causes a voltage drop due to the internal resistances R _o to R ₁ and becomes V _o '[V] at the ends x, x of the electrode p ₂ on the side corresponding to the string s in the bass range. Next, when the lowest note (440Hz) string S is struck, a voltage of V ₁ [V] is generated at the electrode p ₂ of the pick-up p, and this voltage V ₁
causes a voltage drop due to the internal resistance R ₁ and at the ends x, x of the electrode p ₂ on the side corresponding to the bass string s.
It becomes V ₁ ′ [V]. Therefore, the volume output from the _{ends X} ,
A difference of _o ′ [dB] occurs.

The lowest and highest tone signal voltages generated in this pickup P and output from the ends X and X of electrode _P2 on the side corresponding to the string S in the bass range are input to the high-pass filter HF via amplifier a. . If this high-pass filter HF is configured to have an attenuation characteristic of (20logV ₁ ′/V _o ′)/ ₄ [dB/ _oct ] in accordance with the output characteristics of the pickup, the lowest tone part ( The signal voltage V _o ' of the highest tone part of the four octaves (1760 Hz), which is attenuated by (20 log V ₁ '/V _{o '} ) with respect to the signal voltage V 1 ' of 440 Hz), is output almost unchanged even though it passes through the high-pass filter. Signal voltage of the lowest note that is hardly attenuated due to internal resistance
When V ₁ ′ passes through a high-pass filter HF, it becomes [(20logV ₁ ′/V _o ′)/4]×4=20logV ₁ ′/V _o ′
Attenuate and output. Thus, the fundamental tone components of the highest tone part and the lowest tone part have approximately the same magnitude. In both the highest tone part and the lowest tone part, the high-order harmonic components are not attenuated compared to the fundamental tone component. Therefore, in the output of the high-pass filter HF, a musical tone signal having a hard tone in both the lowest and highest tones and having approximately the same level appears.

The lowest and highest tone signal voltages generated at this pickup P and output from the ends y, y of electrode _P2 on the side corresponding to the string S in the treble range are input to the low-pass filter LF via amplifier a. . If this low-pass filter LF is set to have an attenuation characteristic of (20logV _o ′/V ₁ ′)/4 [dB/oct] in accordance with the output characteristics of the pickup, the highest tone signal will be reduced by the internal resistance R ₁ ...R _o . For voltage V _o ′ (20logV _o ′/
V ₁ ′) The attenuated lowest tone signal voltage V ₁ ′ is output almost unchanged even after passing through the low-pass filter LF. When the signal voltage V _o at the highest pitch, which is hardly attenuated due to internal resistance, is passed through the low-pass filter LF, it is attenuated by [(20logV _o ′/V ₁ ′)/4]×4=20logV _o ′/V ₁ ′ and output. Thus, the fundamental tone components of the highest tone part and the lowest tone part have approximately the same magnitude. In both the highest tone part and the lowest tone part, high-order harmonic components are attenuated more than the fundamental tone component. Therefore, the output of the low-pass filter LF is a musical tone signal having a round tone in both the lowest and highest notes and having approximately the same level.

In this way, according to the present invention, one of the electrodes of the pickup P is made of a low conductive material, and the end of the electrode corresponding to the treble strings is connected to a low pass filter, while the end of the electrode corresponding to the bass strings is connected to a high pass filter. This has the effect of making it possible to pick up sounds with a hard or round tone color at a roughly constant volume in both the treble and bass ranges in a well-balanced manner.

[Brief explanation of the drawing]

1 is a perspective view of a pickup used in the present invention, FIG. 2 is a circuit diagram of an embodiment of the present invention, and FIG. 3 is an equivalent circuit diagram of the pickup of FIG. 1. p...pickup, _p2 ...elastic piezoelectric material, _P2 ,
P ₃ ...Electrode, LF...Low pass filter, HF...
High pass filter, V ₁ to V _o ... Pickup generation voltage, R ₁ to R _o ... Pickup internal resistance,
x, y...electrode end.

Claims (1)

[Scope of utility model registration request] One electrode P ₂ or P ₃ of a long pick-up P common to a plurality of strings using a piezoelectric material is formed of a low conductive material, and the electrode P ₂ or P ₃ on the side corresponding to the string in the high range is formed of a low conductive material. 1. A pickup device for an electric musical instrument, characterized in that an end of the electrode _P2 or _P3 on the side corresponding to the strings in the low range is connected to a high-pass filter.