JPH0190092U - - Google Patents

Info

Publication number
JPH0190092U
JPH0190092U JP18635187U JP18635187U JPH0190092U JP H0190092 U JPH0190092 U JP H0190092U JP 18635187 U JP18635187 U JP 18635187U JP 18635187 U JP18635187 U JP 18635187U JP H0190092 U JPH0190092 U JP H0190092U
Authority
JP
Japan
Prior art keywords
address
zero
waveform
level difference
time
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.)
Granted
Application number
JP18635187U
Other languages
Japanese (ja)
Other versions
JP2545053Y2 (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1987186351U priority Critical patent/JP2545053Y2/en
Publication of JPH0190092U publication Critical patent/JPH0190092U/ja
Application granted granted Critical
Publication of JP2545053Y2 publication Critical patent/JP2545053Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【図面の簡単な説明】[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 (1)

【実用新案登録請求の範囲】 サンプリングした外部音を楽音波形データとし
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
号の切り変わつた後の最初のアドレスにおける符
号及び波形値を読み取るとともに、そのアドレス
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、今回読み取つた波形値と上記確定されたエ
ンドアドレスにおける波形値とのレベル差を求め
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レベル差
を予め設定した所定値と比較し、そのレベル差が
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、そのときのレベル差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 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.
JP1987186351U 1987-12-09 1987-12-09 Address setting device Expired - Lifetime JP2545053Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1987186351U JP2545053Y2 (en) 1987-12-09 1987-12-09 Address setting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1987186351U JP2545053Y2 (en) 1987-12-09 1987-12-09 Address setting device

Publications (2)

Publication Number Publication Date
JPH0190092U true JPH0190092U (en) 1989-06-14
JP2545053Y2 JP2545053Y2 (en) 1997-08-25

Family

ID=31477582

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1987186351U Expired - Lifetime JP2545053Y2 (en) 1987-12-09 1987-12-09 Address setting device

Country Status (1)

Country Link
JP (1) JP2545053Y2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013050596A (en) * 2011-08-31 2013-03-14 Jvc Kenwood Corp Sound reproduction device, sound reproduction method, and program

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5758195A (en) * 1980-09-25 1982-04-07 Matsushita Electric Ind Co Ltd Ensemble tone source device
JPS58143398A (en) * 1982-02-19 1983-08-25 三洋電機株式会社 Voice synthesizer
US4442745A (en) * 1980-04-28 1984-04-17 Norlin Industries, Inc. Long duration aperiodic musical waveform generator
JPS6145298A (en) * 1984-08-09 1986-03-05 カシオ計算機株式会社 Electronic musical instrument

Patent Citations (4)

* Cited by examiner, † Cited by third party
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
JPS5758195A (en) * 1980-09-25 1982-04-07 Matsushita Electric Ind Co Ltd Ensemble tone source device
JPS58143398A (en) * 1982-02-19 1983-08-25 三洋電機株式会社 Voice synthesizer
JPS6145298A (en) * 1984-08-09 1986-03-05 カシオ計算機株式会社 Electronic musical instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013050596A (en) * 2011-08-31 2013-03-14 Jvc Kenwood Corp Sound reproduction device, sound reproduction method, and program

Also Published As

Publication number Publication date
JP2545053Y2 (en) 1997-08-25

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