JPH0283594U

JPH0283594U -

Info

Publication number: JPH0283594U
Application number: JP16244388U
Authority: JP
Priority date: 1988-12-16
Filing date: 1988-12-16
Publication date: 1990-06-28

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係る電子弦楽器の
外観図、第２図はフレツトスイツチの構成図、第
３図は上記一実施例の全体ブロツク図、第４図は
フレツト操作位置検出回路の詳細な回路図、第５
図はフレツト値格納域の内部構成図、第６図は本
実施例の原理説明図、第７図はＣＰＵ４１が行う
全体的な動作を説明するフローチヤート、第８図
はタイマ処理を説明するフローチヤート、第９図
はフレツト走査処理を詳細に説明するフローチヤ
ート、第１０図は各弦処理の詳細な動作を説明す
るフローチヤート、第１１図はフレツト値算出処
理の詳細な動作を説明するフローチヤート、第１
２図はフレツト値とフレツト操作位置との対応関
係を示す図、第１３図は撥弦処理の詳細な動作を
説明するフローチヤートである。２１……胴部、２２……ネツク、２３……ヘツ
ド、２４―１〜２４―６……弦、２７……フイン
ガーボード、２８―１〜２８―６……ピツクアツ
プ、４１……ＣＰＵ、４８……ＲＡＭ、４９……
ＲＯＭ、１００……フレツト操作位置検出回路、
１１０，１１１―１〜１１１―６……抵抗回路、
１２０……セレクタ、１２１―１〜１２１―７…
…アナログスイツチ、１２２……マルチプレクサ
、１２３……定電流源、１３０……Ａ／Ｄ変換器
、２１６……固定電極、２１７……可動電極、Ｆ
ＳＷ（１）〜ＦＳＷ（ｎ）……フレツトスイツチ
、Ｒ_１〜Ｒ_ｎ，Ｒ_ｔ……抵抗器。 Fig. 1 is an external view of an electronic stringed instrument according to an embodiment of the present invention, Fig. 2 is a configuration diagram of a frett switch, Fig. 3 is an overall block diagram of the above embodiment, and Fig. 4 is a diagram of a fret operation position detection circuit. Detailed circuit diagram, 5th
Figure 6 is an internal configuration diagram of the fret value storage area, Figure 6 is a diagram explaining the principle of this embodiment, Figure 7 is a flowchart explaining the overall operation performed by the CPU 41, and Figure 8 is a flowchart explaining timer processing. Figure 9 is a flowchart explaining the fret scanning process in detail, Figure 10 is a flowchart explaining the detailed operation of each string process, and Figure 11 is a flowchart explaining the detailed operation of the fret value calculation process. Chart, 1st
FIG. 2 is a diagram showing the correspondence between fret values and fret operation positions, and FIG. 13 is a flowchart illustrating the detailed operation of string plucking processing. 21... body, 22... neck, 23... head, 24-1 to 24-6... strings, 27... finger board, 28-1 to 28-6... pickup, 41... CPU, 48...RAM, 49...
ROM, 100... Fret operation position detection circuit,
110, 111-1 to 111-6...resistance circuit,
120...Selector, 121-1 to 121-7...
... Analog switch, 122 ... Multiplexer, 123 ... Constant current source, 130 ... A/D converter, 216 ... Fixed electrode, 217 ... Movable electrode, F
SW(1) to FSW(n)...Flet switch, _R1 to _Rn , _Rt ...Resistor.

Claims

[Claims for Utility Model Registration] (1) Between the plurality of frets provided on the upper surface of the net and the plurality of fretswitches provided facing each string, and between both contacts of the fretswitch at one end facing each string; One contact of each of the frett switches facing each of the strings is connected in series through a resistor, and the one contact of the other end of the frett switch facing each of the strings is grounded, and is provided opposite to each string. a constant current source that outputs a substantially constant current to the other contact of each flip switch of each of the first resistance circuits; a second resistance circuit that is connected to the constant current source; a first control means that controls the current output from the constant current source to be input to the second resistance circuit at predetermined time intervals; A first voltage value output from the second resistance circuit when the output current flows through the second resistance circuit, and a current output from the constant current source facing each string. When flowing through each of the first resistor circuits provided, each of the first
1. A fret operation position detection device for an electronic stringed instrument, comprising: a detection means for detecting a fret operation position of each string based on a second voltage value output from a resistor circuit. (2) The first resistor circuit is configured by connecting both contacts of the one end of the frett switch and the one contact of the adjacent frett switch in series via a first resistor having a predetermined resistance value. The fret operation position detection device for an electronic stringed instrument according to claim 1, characterized in that: (3) The fret operation position detection device for an electronic stringed musical instrument according to claim 2, wherein the second resistance circuit has a resistance value that is a predetermined integral multiple of the resistance value of the first resistor. (4) The second resistance circuit is formed by connecting the first resistors in series in a number equal to the number of the first resistors connected in series in the first resistance circuit. 4. The fret operation position detection device for an electronic stringed instrument according to claim 3. (5) The fret operation position detection device for an electronic stringed instrument according to claim 2, 3 or 4, wherein the first resistor is a printed resistor. (6) The detection means detects when the current output from the constant current source flows through the second resistance circuit.
Based on the first voltage value output from the second resistance circuit, when the current output from the constant current source flows through the first resistance circuit, A third voltage value generated across the first resistor is calculated, and the fret of each string is calculated based on the third voltage value and the second voltage value output from each of the first resistor circuits. 6. The fret operation position detection device for an electronic stringed instrument according to claim 2, wherein the device detects an operation position. (7) Control so that the current output from the constant current source is sequentially inputted in a time-sharing manner to the other contact of each flet switch of each of the first resistor circuits provided corresponding to each string. Claims 1 and 2, further comprising a second control means for
7. The fret operation position detection device for an electronic stringed instrument according to 3, 4, 5 or 6.