WO2008051766A3 - Adaptive triggers method for signal period measuring - Google Patents
Adaptive triggers method for signal period measuring Download PDFInfo
- Publication number
- WO2008051766A3 WO2008051766A3 PCT/US2007/081662 US2007081662W WO2008051766A3 WO 2008051766 A3 WO2008051766 A3 WO 2008051766A3 US 2007081662 W US2007081662 W US 2007081662W WO 2008051766 A3 WO2008051766 A3 WO 2008051766A3
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- positive
- value
- trigger value
- negative
- input signal
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H3/00—Instruments in which the tones are generated by electromechanical means
- G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
- G10H3/125—Extracting or recognising the pitch or fundamental frequency of the picked up signal
Abstract
An initial positive trigger value is above a minimum positive trigger value which is above an input signal DC component value An initial negative trigger value is under a maximum negative trigger value which is under the input signal DC component value Maximum and minimum signal values are measured and used for the next positive and negative trigger value calculations A positive signal half period is measured from the time point when a signal value becomes greater than the positive trigger value, to a time point where the input signal becomes less than the negative trigger value The negative half period measuring ends when the input signal value becomes greater than the positive trigger value Positive and negative half period measurements are repeated and are stored to memory
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RSP-2006/0577 | 2006-10-19 | ||
RSMP20060577 | 2006-10-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008051766A2 WO2008051766A2 (en) | 2008-05-02 |
WO2008051766A3 true WO2008051766A3 (en) | 2008-08-14 |
Family
ID=39325252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2007/081662 WO2008051766A2 (en) | 2006-10-19 | 2007-10-17 | Adaptive triggers method for signal period measuring |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2008051766A2 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3571522A (en) * | 1968-11-29 | 1971-03-16 | Bell Telephone Labor Inc | Tone detector |
US4688464A (en) * | 1986-01-16 | 1987-08-25 | Ivl Technologies Ltd. | Pitch detection apparatus |
US5262714A (en) * | 1992-02-05 | 1993-11-16 | Vladimir Friedman | Sinewave frequency measuring apparatus |
US5293879A (en) * | 1991-09-23 | 1994-03-15 | Vitatron Medical, B.V. | System an method for detecting tremors such as those which result from parkinson's disease |
US5780759A (en) * | 1995-01-12 | 1998-07-14 | Blue Chip Music Gmbh | Method for pitch recognition, in particular for musical instruments which are excited by plucking or striking |
US6166566A (en) * | 1997-11-14 | 2000-12-26 | Linear Technology Corporation | Adaptive threshold circuit for comparators |
-
2007
- 2007-10-17 WO PCT/US2007/081662 patent/WO2008051766A2/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3571522A (en) * | 1968-11-29 | 1971-03-16 | Bell Telephone Labor Inc | Tone detector |
US4688464A (en) * | 1986-01-16 | 1987-08-25 | Ivl Technologies Ltd. | Pitch detection apparatus |
US5293879A (en) * | 1991-09-23 | 1994-03-15 | Vitatron Medical, B.V. | System an method for detecting tremors such as those which result from parkinson's disease |
US5262714A (en) * | 1992-02-05 | 1993-11-16 | Vladimir Friedman | Sinewave frequency measuring apparatus |
US5780759A (en) * | 1995-01-12 | 1998-07-14 | Blue Chip Music Gmbh | Method for pitch recognition, in particular for musical instruments which are excited by plucking or striking |
US6166566A (en) * | 1997-11-14 | 2000-12-26 | Linear Technology Corporation | Adaptive threshold circuit for comparators |
Also Published As
Publication number | Publication date |
---|---|
WO2008051766A2 (en) | 2008-05-02 |
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