JPH0433099U

JPH0433099U -

Info

Publication number: JPH0433099U
Application number: JP7486290U
Authority: JP
Priority date: 1990-07-13
Filing date: 1990-07-13
Publication date: 1992-03-18

Description

[Brief explanation of the drawing]

第１図は本考案の作用を説明するための図、第
２図は本考案の一実施例としての変調効果装置を
備えた電子楽器の全体的な構成を示すブロツク図
、第３図は実施例装置におけるＳＩＮテーブルを
説明するための図、第４図は実施例装置のＣＰＵ
により実行される主ルーチンを示す流れ図、第５
図は主ルーチン内のパネル処理ルーチンを詳細に
示す流れ図、第６図は実施例装置のＣＰＵにより
実行されるタイマ割込み処理ルーチンを示す流れ
図、第７図はビブラート効果用の変調信号波形が
生成される様子を示す波形図、第８図はデユーテ
イ比を変化させた場合のビブラート制御データを
示す波形図、および、第９図は従来の一般的な電
子楽器の構成を示す図である。１……中央処理装置（ＣＰＵ）、２……読出し
／書込みメモリ（ＲＡＭ）、３……読出し専用メ
モリ（ＲＯＭ）、４……タイマ、５……鍵盤部、
６……パネル部、７……楽音生成回路、８……バ
ス、９……増幅器。 FIG. 1 is a diagram for explaining the operation of the present invention, FIG. 2 is a block diagram showing the overall configuration of an electronic musical instrument equipped with a modulation effect device as an embodiment of the present invention, and FIG. 3 is a diagram showing the implementation of the present invention. A diagram for explaining the SIN table in the example device, FIG. 4 shows the CPU of the example device.
Flowchart illustrating the main routine executed by
FIG. 6 is a flowchart showing the panel processing routine in the main routine in detail, FIG. 6 is a flowchart showing the timer interrupt processing routine executed by the CPU of the embodiment device, and FIG. FIG. 8 is a waveform diagram showing vibrato control data when the duty ratio is changed, and FIG. 9 is a diagram showing the configuration of a conventional general electronic musical instrument. 1...Central processing unit (CPU), 2...Read/write memory (RAM), 3...Read-only memory (ROM), 4...Timer, 5...Keyboard section,
6... Panel section, 7... Musical tone generation circuit, 8... Bus, 9... Amplifier.

Claims

[Claims for Utility Model Registration] 1. In a modulation effect device for an electronic musical instrument used to generate a musical tone signal to which a modulation effect is imparted by a modulation signal, one cycle of the modulation signal is divided into a first period and a second period. means for setting a ratio of division into sections; means for changing the amplitude of the modulated signal from a first value to a second value over time in the first section; and means for changing the amplitude of the modulated signal from a first value to a second value over time in the first section A modulation effect device for an electronic musical instrument, comprising means for changing the amplitude of the modulation signal from the second value to the first value over time. 2. In a modulation effect device for an electronic musical instrument used to generate a musical tone signal to which a modulation effect is imparted by a modulation signal, means for setting a division ratio for dividing one cycle of the modulation signal into a plurality of sections; A modulation effect device for an electronic musical instrument, comprising means for generating a modulation signal with an arbitrary waveform shape in each of the divided sections.