JPH0380499U - - Google Patents
Info
- Publication number
- JPH0380499U JPH0380499U JP14104989U JP14104989U JPH0380499U JP H0380499 U JPH0380499 U JP H0380499U JP 14104989 U JP14104989 U JP 14104989U JP 14104989 U JP14104989 U JP 14104989U JP H0380499 U JPH0380499 U JP H0380499U
- Authority
- JP
- Japan
- Prior art keywords
- sound signal
- spectrum
- sampling
- extracting
- pitch extraction
- 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
- 230000005236 sound signal Effects 0.000 claims description 17
- 238000000605 extraction Methods 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 13
- 238000001228 spectrum Methods 0.000 claims description 12
- 239000011295 pitch Substances 0.000 claims 16
- 238000013139 quantization Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
第１図はこの考案の実施例に係るピツチ抽出装
置の全体構成図、第２図は第１図のクロツクジエ
ネレータ１４の構成図、第３図はサンプリング周
波数を２０ＫＨｚにしたときのクロツクジエネレ
ータの動作のタイムチヤート、第４図は第１図の
デジタルシグナルプロセツサ（ＤＳＰ）１のメイ
ン処理のフローチヤート、第５図は第１図のＤＳ
Ｐ１のインタラプト処理のフローチヤート、第６
図は外部メモリのアドレスマツプを示す図、第７
図はサンプル数１０２４、サンプリング周波数２
０ＫＨｚの下での音信号のスペクトルを例示する
図、第８図は設定条件を参照してスペクトルから
ピツチを抽出する処理のフローチヤート、第９図
は異なるサンプリング周波数におけるスペクトル
ナンバーと音階音との対応を示す図である。
１……デジタルシグナルプロセツサ、２ａ……
プログラムデータＲＯＭ、２ｂ……演算用ＲＡＭ
、８……各種制御スイツチ部。
FIG. 1 is an overall configuration diagram of a pitch extraction device according to an embodiment of this invention, FIG. 2 is a configuration diagram of the clock generator 14 of FIG. 1, and FIG. 3 is a diagram of the clock generator 14 when the sampling frequency is 20 KHz. Figure 4 is a flowchart of the main processing of the digital signal processor (DSP) 1 in Figure 1. Figure 5 is a time chart of the operation of the energizer.
Flowchart of P1 interrupt processing, No. 6
Figure 7 shows the address map of external memory.
The figure shows a sample count of 1024 and a sampling frequency of 2.
A diagram illustrating the spectrum of a sound signal under 0 KHz, Figure 8 is a flowchart of the process of extracting pitch from the spectrum with reference to the setting conditions, and Figure 9 shows the relationship between spectrum numbers and scale notes at different sampling frequencies. It is a diagram showing correspondence. 1...Digital signal processor, 2a...
Program data ROM, 2b...RAM for calculation
, 8...Various control switch parts.
Claims (1)
プリング手段と、 サンプリングした音信号入力のスペクトルを抽
出するスペクトル抽出手段と、 抽出したスペクトルのなかで所定の条件を満た
す成分を検出することにより、音信号入力に従つ
て数が可変のピツチを抽出する可変数ピツチ抽出
手段と、 を有することを特徴とする音信号ピツチ抽出装置
。 (2) 請求項１記載の音信号ピツチ抽出装置にお
いて、 前記可変数ピツチ抽出手段は、 抽出されたスペクトルのなかで所定の基音レベ
ルを越える周波数成分を検出する手段と、 検出された周波数成分のなかでその倍音成分が
所定の倍音レベルを超える周波数成分を前記ピツ
チまたはその候補として選択する手段と、 を有することを特徴とする音信号ピツチ抽出装置
。 (3) サンプリング周波数を可変に設定する可変
サンプリング周波数設定手段と、 設定されたサンプリング周波数で音信号入力を
サンプリングする音信号サンプリング手段と、 サンプリングした音信号のスペクトルを抽出す
るスペクトル抽出手段と、 抽出したスペクトルと設定されたサンプリング
周波数とに基づいて、音信号入力に従つて数が可
変のピツチを抽出する可変数ピツチ抽出手段と、 抽出されたピツチを量子化する量子化手段と、 を有することを特徴とする音信号ピツチ抽出装置
。 (4) 音信号入力をサンプリングする音信号サン
プリング手段と、 複数の異なるサンプル数について、サンプリン
グした音信号入力のスペクトルを抽出するスペク
トル抽出手段と、 各サンプル数について抽出したスペクトルに基
づいて、音信号入力に従つて数が可変のピツチを
抽出する可変数ピツチ抽出手段と、 抽出したピツチを量子化する量子化手段と、 を有することを特徴とする音信号ピツチ抽出装置
。[Scope of Claim for Utility Model Registration] (1) Sound signal sampling means for sampling a sound signal input, spectrum extraction means for extracting a spectrum of the sampled sound signal input, and a component of the extracted spectrum that satisfies a predetermined condition. A sound signal pitch extraction device comprising: variable number pitch extraction means for extracting a variable number of pitches according to a sound signal input by detecting the pitches. (2) In the sound signal pitch extraction device according to claim 1, the variable number pitch extraction means includes: means for detecting frequency components exceeding a predetermined fundamental tone level in the extracted spectrum; A sound signal pitch extraction device comprising: means for selecting a frequency component whose overtone component exceeds a predetermined overtone level as the pitch or its candidate. (3) variable sampling frequency setting means for variably setting the sampling frequency; sound signal sampling means for sampling the sound signal input at the set sampling frequency; spectrum extraction means for extracting the spectrum of the sampled sound signal; a variable number pitch extraction means for extracting a variable number of pitches according to the sound signal input, based on the obtained spectrum and a set sampling frequency; and a quantization means for quantizing the extracted pitches. A sound signal pitch extraction device characterized by: (4) sound signal sampling means for sampling the sound signal input; spectrum extraction means for extracting the spectrum of the sampled sound signal input for a plurality of different numbers of samples; A sound signal pitch extraction device comprising: variable number pitch extraction means for extracting pitches whose number is variable according to input; and quantization means for quantizing the extracted pitches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14104989U JPH0380499U (en) | 1989-12-07 | 1989-12-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14104989U JPH0380499U (en) | 1989-12-07 | 1989-12-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0380499U true JPH0380499U (en) | 1991-08-19 |
Family
ID=31687979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14104989U Pending JPH0380499U (en) | 1989-12-07 | 1989-12-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0380499U (en) |
-
1989
- 1989-12-07 JP JP14104989U patent/JPH0380499U/ja active Pending
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