DE3567757D1 - Method for determining the boundaries of a signal mixed with background noise - Google Patents

Method for determining the boundaries of a signal mixed with background noise

Info

Publication number
DE3567757D1
DE3567757D1 DE8585103259T DE3567757T DE3567757D1 DE 3567757 D1 DE3567757 D1 DE 3567757D1 DE 8585103259 T DE8585103259 T DE 8585103259T DE 3567757 T DE3567757 T DE 3567757T DE 3567757 D1 DE3567757 D1 DE 3567757D1
Authority
DE
Germany
Prior art keywords
signal
interest
variable
determined
transmission frequency
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.)
Expired
Application number
DE8585103259T
Other languages
German (de)
Inventor
Berhard Dipl Ing Kammerer
Ulrich Dipl Ing Muller
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE8585103259T priority Critical patent/DE3567757D1/en
Application granted granted Critical
Publication of DE3567757D1 publication Critical patent/DE3567757D1/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/78—Detection of presence or absence of voice signals
    • G10L25/87—Detection of discrete points within a voice signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Complex Calculations (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

1. Method for determining the boundaries of signals mixed with background noise, particularly of signal boundaries for speech processing of words spoken against a background noise, the criterion used for distinguishing between a signal of interest and the background signal or background noise being their amplitude characteristics, characterized in that - in a first step, a signal or noise recorded and subsequently preprocessed, namely an input variable (E), is observed with respect to its mean amplitude (A) and its first transmission frequency (N), referred to a reference variable (R), and its range of fluctuation (dN) within a predetermined time interval, the transmission frequency (N) being averaged from individual transmission frequencies and the range of fluctuation being determined by the maximum deviation of the individual transmission frequencies, - auxiliary variables (S1, S2, N2) are derived from the relevant variables obtained, which auxiliary variables are defined as follows : S1 = a*A+c S2 = b*A+c N2 = N/d, the variables a, b, c, d being constants which are determined by empirical values or by the type of the signal of interest, - in a second step, the current transmission frequency (N1), referred to a reference variable (R), is determined within a time pattern needed for adequate resolution, - one of the previously derived auxiliary variables (S1 or S2) is allocated to a weighting variable (S) in dependence on the observed derived transmission frequency (N2) with its range of fluctuation (dN) and the current transmission frequency (N1), - the current input variable (E) is measured by means of this weighting variable (S), - an operating (O1) dependent on the position of the input variable (E) relative to the weighting variable (S) is performed, - two boundary values (UG, OG1) are determined on the basis of the type of the signal of interest, - the result of the operation (O1) is limited towards the bottom by the first limit value (UG), - the existence of a signal of interest is detected when the second upper limit value (OG1) is reached, - the precise beginning of the signal (SB) is in front of the relevant detection time (ZE1) by a defined time interval, - in a third step, the position of the input variable (E) relative to the weighting variable (S) is evaluated by a further operation (O2) in such a manner that the non-existence of the signal of interest detected in the second step is established using a second limid value (OG2) which has been previously determined on the basis of the type of the signal of interest, the further operation being defined as follows : O2 = 02+1 for ¦E¦ < S O2 = O in all other cases or OG2 in all other cases or O2 - 1 for ¦E¦ < S, - and the precise signal end (SE) is in front of the relevant detection time (ZE2) by a defined time interval.
DE8585103259T 1984-03-28 1985-03-20 Method for determining the boundaries of a signal mixed with background noise Expired DE3567757D1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8585103259T DE3567757D1 (en) 1984-03-28 1985-03-20 Method for determining the boundaries of a signal mixed with background noise

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843411485 DE3411485A1 (en) 1984-03-28 1984-03-28 METHOD FOR DETECTING THE LIMITS OF SIGNALS THAT APPEAR IN MIXTURE BEFORE A BACKGROUND SIGNAL MIXTURE
DE8585103259T DE3567757D1 (en) 1984-03-28 1985-03-20 Method for determining the boundaries of a signal mixed with background noise

Publications (1)

Publication Number Publication Date
DE3567757D1 true DE3567757D1 (en) 1989-02-23

Family

ID=6231908

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19843411485 Withdrawn DE3411485A1 (en) 1984-03-28 1984-03-28 METHOD FOR DETECTING THE LIMITS OF SIGNALS THAT APPEAR IN MIXTURE BEFORE A BACKGROUND SIGNAL MIXTURE
DE8585103259T Expired DE3567757D1 (en) 1984-03-28 1985-03-20 Method for determining the boundaries of a signal mixed with background noise

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE19843411485 Withdrawn DE3411485A1 (en) 1984-03-28 1984-03-28 METHOD FOR DETECTING THE LIMITS OF SIGNALS THAT APPEAR IN MIXTURE BEFORE A BACKGROUND SIGNAL MIXTURE

Country Status (4)

Country Link
EP (1) EP0161423B1 (en)
JP (1) JPS60218700A (en)
AT (1) ATE40235T1 (en)
DE (2) DE3411485A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0275099B1 (en) * 1987-01-16 1994-03-23 Sharp Kabushiki Kaisha Voice analyzing and synthesizing apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1772633U (en) 1958-06-26 1958-08-21 No Sag Drahtfedern Gmbh SPRING FOR UPHOLSTERY FRAME.
GB1012765A (en) 1964-03-06 1965-12-08 Standard Telephones Cables Ltd Apparatus for the analysis of waveforms
GB1495389A (en) 1974-01-31 1977-12-14 Atomic Energy Authority Uk Apparatus for providing time reference signals
US4032710A (en) * 1975-03-10 1977-06-28 Threshold Technology, Inc. Word boundary detector for speech recognition equipment
FR2402971A1 (en) 1977-09-09 1979-04-06 Onera (Off Nat Aerospatiale) SYNTACTIC EXTRACTOR OF EVOLVING SIGNALS AND EXTRACTION PROCESS
DE3003556C2 (en) 1980-02-01 1984-12-06 Dornier Gmbh, 7990 Friedrichshafen Method and device for determining a useful signal from a band-limited signal superimposed with interference signals
US4388495A (en) 1981-05-01 1983-06-14 Interstate Electronics Corporation Speech recognition microcomputer
DE3207556C2 (en) 1982-03-03 1983-12-22 Vierling, Oskar, Prof. Dr.Phil.Habil., 8553 Ebermannstadt Arrangement for measuring the characteristic times of pulses and pulse series

Also Published As

Publication number Publication date
JPS60218700A (en) 1985-11-01
DE3411485A1 (en) 1985-10-03
EP0161423A1 (en) 1985-11-21
ATE40235T1 (en) 1989-02-15
EP0161423B1 (en) 1989-01-18

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee