JPS6126091A - Musical scale detector - Google Patents
Musical scale detectorInfo
- Publication number
- JPS6126091A JPS6126091A JP14729884A JP14729884A JPS6126091A JP S6126091 A JPS6126091 A JP S6126091A JP 14729884 A JP14729884 A JP 14729884A JP 14729884 A JP14729884 A JP 14729884A JP S6126091 A JPS6126091 A JP S6126091A
- Authority
- JP
- Japan
- Prior art keywords
- input
- pitch
- output
- detecting
- input signal
- 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
Landscapes
- Auxiliary Devices For Music (AREA)
- Electrophonic Musical Instruments (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分（け〕
本発明は、音声あるいは楽音の音程検出装置に関し、特
にギター等の弦楽器の音程検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a pitch detection device for voice or musical tones, and particularly to a pitch detection device for stringed instruments such as guitars.
従来はピッチ抽出手段のみであった。 Conventionally, there was only a pitch extraction means.
しかし従来の技術では、第２図のＡのような波形（この
波形はギターの波形の一例である。）を入力すると、第
２図中のピッチＴ１とＴ２は正確な基本ピンチであるが
、ピッチＴ５ 、 Ｔ４ 、 Ｔ５は正確な基本ピッチ
でないピッチを出力してしまう欠点があっ“た。However, with the conventional technology, when a waveform like A in Fig. 2 (this waveform is an example of a guitar waveform) is input, pitches T1 and T2 in Fig. 2 are accurate basic pinches; Pitches T5, T4, and T5 had the drawback of outputting pitches that were not accurate basic pitches.
本発明は、従来のこのような欠点を解決するため、正確
な基本ピッチのみを抽出することを目的としている。The present invention aims to extract only accurate basic pitches in order to solve these conventional drawbacks.
上記問題点をｙｊイ決するため、本発明は、入力信号が
発生した後、ある時間のみピッチデータを出力し、正確
な基本ピッチデータを得ることを目的としている。In order to resolve the above-mentioned problems, the present invention aims to output pitch data only for a certain period of time after an input signal is generated, thereby obtaining accurate basic pitch data.
図面により、本発明の一実施例を説明する。第１図に本
発明の一実施例の回路図を示す。第２図に各部の波形を
示す。入力信号が接続されている入力レベル検出手段２
は、コンパレータ１−１と抵抗Ｒ１、Ｒ２、Ｒ５、Ｒ４
とダイオードＤとコンデンサーＣとＭＯＳ）ランシスタ
ーＴｒ１で構成される。入力レベル検出手段２の動作を
説明すると、入力信号が入っていない場合コンパレータ
１−１の出力はＬＯＷでありＭＯＳ）ランシスター Ｔ
ｒ １はＯＦＦとなるのでコンパレータ１−１の比較
電圧ＶＣｏｍＰは
となる。又、入力電圧が太き（Ｍ ＯＳ ）ランシスタ
ーＴｒ１がＯＮの時の比較電圧Ｖ ｃｏｍＰはとなる。An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a circuit diagram of an embodiment of the present invention. Figure 2 shows the waveforms of each part. Input level detection means 2 to which the input signal is connected
is comparator 1-1 and resistors R1, R2, R5, R4
, a diode D, a capacitor C, and a MOS) run transistor Tr1. To explain the operation of the input level detection means 2, when there is no input signal, the output of the comparator 1-1 is LOW, and the output of the comparator 1-1 is LOW.
Since r1 is OFF, the comparison voltage VComP of the comparator 1-1 becomes. Further, when the input voltage is large (MOS) and the run sister Tr1 is ON, the comparison voltage V comP is as follows.
すなわち、入力電圧が小さい状態から大きい状、聾にな
る場合のしきい値は
小さい状態になる場合のしきい値はａ、 −）−ａ、
ｖｃｃとなるのでヒステリシス特性が得られる。In other words, when the input voltage changes from a small state to a large state, the threshold value for becoming deaf is a, -)-a,
vcc, so a hysteresis characteristic can be obtained.
さてここで入力信号が第２図のＡのような波形で入力さ
れたとして本実施例の動作を訳明する。Now, the operation of this embodiment will be explained assuming that the input signal is input with a waveform like A in FIG.
入力信号が入力されると時刻ｔ１において入力レベル検
出手段２の出力（第２図のＢ）はＨＩＧＨとなる。従っ
て、制御手段３内のワンシミツトパルス発生回路１−２
の出力（第２図のＣ）がＨ工ＧＩＨとなりＡＮＤゲート
Ａ−１〜Ａ〜８のゲートが開き、入力信号が入力されて
いるピッチ抽出手段１からピッチデータがピッチデータ
出力端子１−３に生じる。時刻ｔ２において、ワンシミ
ツトパルス発生回路１−２の出力はＬＯＷとなり、ＡＮ
ＤゲートＡ −１−Ａ −８のゲートが閉じピッチデー
タはピッチデータ出力端子１−３に出力されない。以上
のようにして正確な基本ピッチデータのみ出力されるの
である。入力レベル検出手段２にヒステリシス特性が必
要なのは、ある楽音では、信号レベルの減衰時に信号レ
ベルが大きくなったり小さくなったりして減衰していく
ために必要である。When the input signal is input, the output of the input level detection means 2 (B in FIG. 2) becomes HIGH at time t1. Therefore, the one-sided pulse generation circuit 1-2 in the control means 3
The output (C in Fig. 2) becomes H GIH, and the gates of AND gates A-1 to A-8 are opened, and the pitch data is transferred from the pitch extraction means 1 to which the input signal is input to the pitch data output terminal 1-3. occurs in At time t2, the output of the one-sided pulse generation circuit 1-2 becomes LOW, and the AN
The gates of D gates A-1-A-8 are closed and pitch data is not output to pitch data output terminals 1-3. In this manner, only accurate basic pitch data is output. The input level detecting means 2 requires a hysteresis characteristic because, for certain musical tones, when the signal level is attenuated, the signal level increases or decreases and attenuates.
以上のように本発明によれば、弦楽器等の信号に対して
も正ｒ６：な基本ピッチが得られ、正確な音程を検出で
きる音程検出装置が得られるという効果がある。As described above, according to the present invention, a positive r6: basic pitch can be obtained even for signals of stringed instruments, etc., and an interval detection device that can accurately detect intervals can be obtained.
第１図は本発明の実施例を示す回路図、第２図は本実施
例の各部波Ｊし図である。
１・・・・・・ピッチ抽出手段
２・・・・・・入力レベル検出手段
３・・・・・・制御手段FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a wave diagram of each part of this embodiment. 1... Pitch extraction means 2... Input level detection means 3... Control means
Claims (2)
ッチ抽出手段に入力されたことを検出する入力レベル検
出手段と、該入力レベル検出手段が入力信号が生じたこ
とを検出した後ある時間以内のみ、該ピッチ抽出手段の
出力を正確な音程であると検出する制御手段とで構成さ
れたことを特徴とする音程検出装置。(1) At least pitch extraction means, input level detection means for detecting that an input signal is input to the pitch extraction means, and within a certain time after the input level detection means detects that the input signal has occurred. and a control means for detecting the output of the pitch extraction means as an accurate pitch.
たコンパレータで構成されたことを特徴とする特許請求
の範囲第一項記載の音程検出装置。(2) The pitch detecting device according to claim 1, wherein the input level detecting means is constituted by a comparator having hysteresis characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14729884A JPS6126091A (en) | 1984-07-16 | 1984-07-16 | Musical scale detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14729884A JPS6126091A (en) | 1984-07-16 | 1984-07-16 | Musical scale detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6126091A true JPS6126091A (en) | 1986-02-05 |
Family
ID=15427033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14729884A Pending JPS6126091A (en) | 1984-07-16 | 1984-07-16 | Musical scale detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6126091A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63243998A (en) * | 1987-03-31 | 1988-10-11 | カシオ計算機株式会社 | Input controller for electronic musical instrument |
| JPS63170896U (en) * | 1987-04-27 | 1988-11-07 | ||
| JPS63294597A (en) * | 1987-05-27 | 1988-12-01 | カシオ計算機株式会社 | Input controller for electronic stringed instrument |
| JPH01312596A (en) * | 1988-06-10 | 1989-12-18 | Casio Comput Co Ltd | Electronic musical instrument |
| JPH01312598A (en) * | 1988-06-10 | 1989-12-18 | Casio Comput Co Ltd | Electronic musical instrument |
| JPH01312595A (en) * | 1988-06-10 | 1989-12-18 | Casio Comput Co Ltd | Electronic musical instrument |
| JPH01312597A (en) * | 1988-06-10 | 1989-12-18 | Casio Comput Co Ltd | Electronic musical instrument |
| JPH02126288A (en) * | 1988-11-05 | 1990-05-15 | Seiko Instr Inc | Tuning device |
-
1984
- 1984-07-16 JP JP14729884A patent/JPS6126091A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63243998A (en) * | 1987-03-31 | 1988-10-11 | カシオ計算機株式会社 | Input controller for electronic musical instrument |
| JPS63170896U (en) * | 1987-04-27 | 1988-11-07 | ||
| JPS63294597A (en) * | 1987-05-27 | 1988-12-01 | カシオ計算機株式会社 | Input controller for electronic stringed instrument |
| JP2560327B2 (en) * | 1987-05-27 | 1996-12-04 | カシオ計算機株式会社 | Electronic string instrument |
| JPH01312596A (en) * | 1988-06-10 | 1989-12-18 | Casio Comput Co Ltd | Electronic musical instrument |
| JPH01312598A (en) * | 1988-06-10 | 1989-12-18 | Casio Comput Co Ltd | Electronic musical instrument |
| JPH01312595A (en) * | 1988-06-10 | 1989-12-18 | Casio Comput Co Ltd | Electronic musical instrument |
| JPH01312597A (en) * | 1988-06-10 | 1989-12-18 | Casio Comput Co Ltd | Electronic musical instrument |
| JP2759149B2 (en) * | 1988-06-10 | 1998-05-28 | カシオ計算機株式会社 | Music control device |
| JPH02126288A (en) * | 1988-11-05 | 1990-05-15 | Seiko Instr Inc | Tuning device |
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