JPH0190093U - - Google Patents
Info
- Publication number
- JPH0190093U JPH0190093U JP18635287U JP18635287U JPH0190093U JP H0190093 U JPH0190093 U JP H0190093U JP 18635287 U JP18635287 U JP 18635287U JP 18635287 U JP18635287 U JP 18635287U JP H0190093 U JPH0190093 U JP H0190093U
- Authority
- JP
- Japan
- Prior art keywords
- address
- zero
- crossing point
- value
- waveform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 1
Description
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 (1)
て記憶する記憶手段と、前記記憶手段に記憶され
ている波形データについて所望の区間の先頭位置
に対応するスタートアドレス及び最終位置に対応
するエンドアドレスを指定するループ区間指定手
段とを有する電子楽器において、 上記ループ区間指定手段によつて指定されたエ
ンドアドレスからスタートアドレスに至るまで上
記記憶手段のアドレスを遂次デイクリメントして
行き、前後の各アドレスにおける波形値の正負符
号の切り変わるゼロクロスポイントを検出するゼ
ロクロスポイント検出手段と、 このゼロクロスポイント検出手段による第1回
目のゼロクロスポイントの検出に際して、その符
号の切り変わつた最初のアドレスの符号を読み取
り且つそのアドレスにおける波形値と1つ手前の
アドレスにおける波形値との間におけるレベル差
を求め、符号の切り変わつわつた後の最初のアド
レスをエンドアドレスとして確定するエンドアド
レス確定手段と、 上記ゼロクロスポイント検出手段による波形の
傾きの符号が同一のゼロクロスポイントの検出に
際し、そのゼロクロスポイントの前後のアドレス
における波形値の間でのレベル差を算出して、こ
のレベル差と前に確定されたエンドアドレスでの
レベル差との差値を求めるレベル差検出手段と、 このレベル差検出手段にて検出された差値を予
め設定した所定値と比較し、その差値がその所定
値よりも小さいゼロクロスポイントを検出して、
このときの差値を新しい所定値として設定し直す
とともに、そのときのアドレスをスタートアドレ
スとして確定するスタートアドレス確定手段と、 を備え、上記スタートアドレスを、上記所定値が
設定し直される都度、更新することを特徴とする
電子楽器。[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, and when the zero-crossing point detecting means detects the first zero-crossing point, it detects the first address at which the sign changes. end address determining means for reading the code, determining the level difference between the waveform value at that address and the waveform value at the previous address, and determining the first address after the code changes as the end address; , When the zero-crossing point detecting means detects a zero-crossing point with the same sign of the waveform slope, the level difference between the waveform values at the addresses before and after the zero-crossing point is calculated, and this level difference is compared with the previously determined zero-crossing point. level difference detection means for calculating the difference value from the level difference at the end address, and comparing the difference value detected by the level difference detection means with a predetermined value set in advance, and determining whether the difference value is greater than the predetermined value. Detect small zero crossing points,
a start address determining means for resetting the difference value at this time as a new predetermined value and determining the address at that time as a start address; and updating the start address each time the predetermined value is reset. An electronic musical instrument characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18635287U JPH0190093U (en) | 1987-12-09 | 1987-12-09 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18635287U JPH0190093U (en) | 1987-12-09 | 1987-12-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0190093U true JPH0190093U (en) | 1989-06-14 |
Family
ID=31477583
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18635287U Pending JPH0190093U (en) | 1987-12-09 | 1987-12-09 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0190093U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0659677A (en) * | 1992-08-07 | 1994-03-04 | Kawai Musical Instr Mfg Co Ltd | Musical sound signal processing method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4442745A (en) * | 1980-04-28 | 1984-04-17 | Norlin Industries, Inc. | Long duration aperiodic musical waveform generator |
JPS61205998A (en) * | 1985-03-11 | 1986-09-12 | 京王技研工業株式会社 | Musical sound generator |
JPS62139588A (en) * | 1985-12-13 | 1987-06-23 | カシオ計算機株式会社 | Sampling electronic musical apparatus |
-
1987
- 1987-12-09 JP JP18635287U patent/JPH0190093U/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4442745A (en) * | 1980-04-28 | 1984-04-17 | Norlin Industries, Inc. | Long duration aperiodic musical waveform generator |
JPS61205998A (en) * | 1985-03-11 | 1986-09-12 | 京王技研工業株式会社 | Musical sound generator |
JPS62139588A (en) * | 1985-12-13 | 1987-06-23 | カシオ計算機株式会社 | Sampling electronic musical apparatus |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0659677A (en) * | 1992-08-07 | 1994-03-04 | Kawai Musical Instr Mfg Co Ltd | Musical sound signal processing method |
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