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WO2008051766A3 - Adaptive triggers method for signal period measuring - Google Patents

Adaptive triggers method for signal period measuring Download PDF

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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
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.)
Ceased
Application number
PCT/US2007/081662
Other languages
French (fr)
Other versions
WO2008051766A2 (en
Inventor
Darko Lazovic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
U S Music Corp
Original Assignee
U S Music Corp
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 by U S Music Corp filed Critical U S Music Corp
Publication of WO2008051766A2 publication Critical patent/WO2008051766A2/en
Publication of WO2008051766A3 publication Critical patent/WO2008051766A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measurement Of Current Or Voltage (AREA)

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
PCT/US2007/081662 2006-10-19 2007-10-17 Adaptive triggers method for signal period measuring Ceased WO2008051766A2 (en)

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 Ceased 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)

* Cited by examiner, † Cited by third party
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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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