JPS5486203A - Extraction unit for fundamental wave signal - Google Patents
Extraction unit for fundamental wave signalInfo
- Publication number
- JPS5486203A JPS5486203A JP15410077A JP15410077A JPS5486203A JP S5486203 A JPS5486203 A JP S5486203A JP 15410077 A JP15410077 A JP 15410077A JP 15410077 A JP15410077 A JP 15410077A JP S5486203 A JPS5486203 A JP S5486203A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- lpf
- input signal
- pass
- fundamental wave
- 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
- Electrophonic Musical Instruments (AREA)
Abstract
PURPOSE: To extract effectively and definitely only fundamental components from an input signal by proviing a variable characteristic filter which allows fundamental frequency components of the input signal including higher harmonics to pass through and by controlling this filter with the output of a fundamental wave detection circuit.
CONSTITUTION: An input signal including a higher harmonic of a sound of a musical instrument performance is supplied to voltage control type variable characteristic filter 20 and fundamental wave detection circuit 22 via buffer 12. Circuit 22 is equipped with LPFs 23a, 23b... with their frequencies set higher in sequence, whose output signals are detected by signal detection circuits 24a, 24b.... The sequence of the lowest-pass LPF 23a is supplied from circuit 24a to gate element 26a directly, but sequences of other LPFs 23b, 23c ... are inputted to gates 26b, 26c... through AND circuits 25b, 25c..., and 27, and inverters 28b, 28c... and filter 20 is controlled by gate outputs. Consequently, the output signal of the lowest-pass filter LPF allowing the input signal to pass through is generated and signals of other filter sequences are inhibited, so that only fundamental wave components will be extracted.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15410077A JPS5486203A (en) | 1977-12-21 | 1977-12-21 | Extraction unit for fundamental wave signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15410077A JPS5486203A (en) | 1977-12-21 | 1977-12-21 | Extraction unit for fundamental wave signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5486203A true JPS5486203A (en) | 1979-07-09 |
Family
ID=15576907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15410077A Pending JPS5486203A (en) | 1977-12-21 | 1977-12-21 | Extraction unit for fundamental wave signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5486203A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009042573A (en) * | 2007-08-09 | 2009-02-26 | Yamaha Corp | Device for detecting fundamental period of voice and apparatus of performing speech rate conversion by using the fundamental period |
| JP2012058764A (en) * | 2011-12-26 | 2012-03-22 | Yamaha Corp | Voice basic cycle detection device and speech speed conversion apparatus using the basic cycle |
| US8326205B2 (en) | 2008-03-24 | 2012-12-04 | Riso Kagaku Corporation | Medium cutting device, image recording apparatus having the medium cutting device, and controlling method of the medium cutting device |
-
1977
- 1977-12-21 JP JP15410077A patent/JPS5486203A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009042573A (en) * | 2007-08-09 | 2009-02-26 | Yamaha Corp | Device for detecting fundamental period of voice and apparatus of performing speech rate conversion by using the fundamental period |
| US8326205B2 (en) | 2008-03-24 | 2012-12-04 | Riso Kagaku Corporation | Medium cutting device, image recording apparatus having the medium cutting device, and controlling method of the medium cutting device |
| JP2012058764A (en) * | 2011-12-26 | 2012-03-22 | Yamaha Corp | Voice basic cycle detection device and speech speed conversion apparatus using the basic cycle |
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