GB9002852D0 - Methods and apparatus for spectral analysis - Google Patents

Methods and apparatus for spectral analysis

Info

Publication number
GB9002852D0
GB9002852D0 GB9002852A GB9002852A GB9002852D0 GB 9002852 D0 GB9002852 D0 GB 9002852D0 GB 9002852 A GB9002852 A GB 9002852A GB 9002852 A GB9002852 A GB 9002852A GB 9002852 D0 GB9002852 D0 GB 9002852D0
Authority
GB
United Kingdom
Prior art keywords
formants
band
power
centroids
measured
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.)
Withdrawn
Application number
GB9002852A
Other versions
GB2240867A (en
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.)
HOLMES JOHN N
Original Assignee
HOLMES JOHN N
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 HOLMES JOHN N filed Critical HOLMES JOHN N
Priority to GB9002852A priority Critical patent/GB2240867A/en
Publication of GB9002852D0 publication Critical patent/GB9002852D0/en
Priority to EP19910301034 priority patent/EP0441642A3/en
Priority to JP1791791A priority patent/JPH05143098A/en
Publication of GB2240867A publication Critical patent/GB2240867A/en
Withdrawn legal-status Critical Current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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/43—Signal processing in hearing aids to enhance the speech intelligibility

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)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

In automatic speech recognition it is usual to make a spectral analysis of the incoming speech signal and it can be useful to detect the frequencies and intensities of the formants. However although the formants are mostly quite well defined during vowel sounds there are frequent occasions when this is not so and it is not so during a high proportion of consonant sounds. The present invention determines the frequencies at which the centroids of respective frequency versus power distributions occur in a plurality of frequency bands of a signal representing speech (approximately corresponding to the ranges of individual formants). The centroids have most of the desirable properties of formants but also carry significant information for those sounds for which the conventional definition of formants does not seem appropriate. Preferably the powers in the bands in which the centroids are measured are also determined. The incoming signal is filtered (2) into separate frequency bands and the power in each band is measured (4). The output signal in each band is weighted by 3 dB per octave (5) and then the power in that band is measured (6). The power ratio obtained (7) for a band from the power after 3 dB weighting divided by the power before weighting gives an indication of the position of the centroid of that band in the frequency spectrum. <IMAGE>
GB9002852A 1990-02-08 1990-02-08 Speech analysis Withdrawn GB2240867A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9002852A GB2240867A (en) 1990-02-08 1990-02-08 Speech analysis
EP19910301034 EP0441642A3 (en) 1990-02-08 1991-02-08 Methods and apparatus for spectral analysis
JP1791791A JPH05143098A (en) 1990-02-08 1991-02-08 Method and apparatus for spectrum analysis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9002852A GB2240867A (en) 1990-02-08 1990-02-08 Speech analysis

Publications (2)

Publication Number Publication Date
GB9002852D0 true GB9002852D0 (en) 1990-04-04
GB2240867A GB2240867A (en) 1991-08-14

Family

ID=10670649

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9002852A Withdrawn GB2240867A (en) 1990-02-08 1990-02-08 Speech analysis

Country Status (3)

Country Link
EP (1) EP0441642A3 (en)
JP (1) JPH05143098A (en)
GB (1) GB2240867A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5623609A (en) * 1993-06-14 1997-04-22 Hal Trust, L.L.C. Computer system and computer-implemented process for phonology-based automatic speech recognition
GB9323991D0 (en) * 1993-11-22 1994-01-12 Holmes John N Method and apparatus for spectral analysis
CA2161045A1 (en) * 1994-11-15 1996-05-16 Michael L. Wells Error detector apparatus with digital coordinate transformation
FR2762180B1 (en) * 1997-04-15 1999-05-07 Roland Roger Carrat METHOD AND DEVICE FOR AMPLIFYING AND ENCODING THE VOICE SIGNAL FOR IMPROVING INTELLIGIBILITY IN A NOISE ENVIRONMENT AND FOR CORRECTING DEAFNESSES
EP1692912A1 (en) * 2003-12-01 2006-08-23 Koninklijke Philips Electronics N.V. Selective audio signal enhancement
JP4568826B2 (en) * 2005-09-08 2010-10-27 株式会社国際電気通信基礎技術研究所 Glottal closure segment detection device and glottal closure segment detection program

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649765A (en) * 1969-10-29 1972-03-14 Bell Telephone Labor Inc Speech analyzer-synthesizer system employing improved formant extractor
DE2313141A1 (en) * 1973-03-16 1974-09-19 Philips Patentverwaltung PROCEDURE AND ARRANGEMENT FOR REAL-TIME DETERMINATION OF THE TRANSMISSION FUNCTIONS OF SYSTEMS
DE2448909B2 (en) * 1974-10-15 1978-12-07 Olympia Werke Ag, 2940 Wilhelmshaven Electrical circuit arrangement for a device for speech recognition
NL8203520A (en) * 1982-09-10 1984-04-02 Philips Nv DIGITAL FILTER DEVICE.

Also Published As

Publication number Publication date
GB2240867A (en) 1991-08-14
EP0441642A2 (en) 1991-08-14
JPH05143098A (en) 1993-06-11
EP0441642A3 (en) 1993-03-10

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)