JPH0190092U

JPH0190092U -

Info

Publication number: JPH0190092U
Application number: JP18635187U
Authority: JP
Priority date: 1987-12-09
Filing date: 1987-12-09
Publication date: 1989-06-14
Anticipated expiration: 2002-12-09
Also published as: JP2545053Y2

Description

[Brief explanation of the drawing]

第１図はこの考案を適用して構成した電子楽器
の全体回路図、第２図はループ区間を自動的に確
定する動作の流れを示すフローチヤート図である
。１……ＣＰＵ、２……スイツチ部、３……アド
レス制御部、４……波形ＲＡＭ、５……周波数デ
ータ作成部、６……Ａ／Ｄコンバータ、７……マ
イクロホン、１０……スピーカ。 FIG. 1 is an overall circuit diagram of an electronic musical instrument constructed by applying this invention, and FIG. 2 is a flowchart showing the flow of operations for automatically determining loop sections. 1...CPU, 2...Switch section, 3...Address control section, 4...Waveform RAM, 5...Frequency data creation section, 6...A/D converter, 7...Microphone, 10...Speaker.

Claims

[Claims for Utility Model Registration] A storage means for storing sampled external sounds as musical waveform data, and a start address corresponding to the beginning position of a desired section and a final position of the waveform data stored in the storage means. and a loop section specifying means for specifying an end address to be used, the address of the storage means is successively decremented from the end address specified by the loop section specifying means to the start address, A zero-crossing point detection means detects a zero-crossing point where the sign of the waveform value changes at each address before and after the waveform value changes, and when the zero-crossing point detecting means detects the first zero-crossing point, it detects the first zero-crossing point after the sign changes. An end address determining means reads the sign and waveform value at an address and determines the address as an end address, and when the zero cross point detecting means detects a zero cross point where the sign of the slope of the waveform is the same, the waveform value read this time and the waveform value read this time are used. Level difference detection means for determining the level difference with the waveform value at the determined end address; and Comparing the level difference detected by the level difference detection means with a predetermined value set in advance, the level difference is determined as the predetermined value. and a start address determining means for detecting a zero cross point smaller than , resetting the level difference at that time as a new predetermined value, and determining the address at that time as a start address, An electronic musical instrument characterized by updating each time a value is reset.