FR2383495A1 - Analyser for acoustic spectral densities - uses eight parallel channel decoders with respective passband filters coupled with logic circuit with integration and summation stages - Google Patents

Analyser for acoustic spectral densities - uses eight parallel channel decoders with respective passband filters coupled with logic circuit with integration and summation stages

Info

Publication number
FR2383495A1
FR2383495A1 FR7707190A FR7707190A FR2383495A1 FR 2383495 A1 FR2383495 A1 FR 2383495A1 FR 7707190 A FR7707190 A FR 7707190A FR 7707190 A FR7707190 A FR 7707190A FR 2383495 A1 FR2383495 A1 FR 2383495A1
Authority
FR
France
Prior art keywords
logic circuit
integration
analyser
parallel channel
acoustic spectral
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.)
Granted
Application number
FR7707190A
Other languages
French (fr)
Other versions
FR2383495B1 (en
Inventor
Emile Leipp
Jean Sapalx
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.)
Bpifrance Financement SA
Original Assignee
Agence National de Valorisation de la Recherche ANVAR
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 Agence National de Valorisation de la Recherche ANVAR filed Critical Agence National de Valorisation de la Recherche ANVAR
Priority to FR7707190A priority Critical patent/FR2383495A1/en
Publication of FR2383495A1 publication Critical patent/FR2383495A1/en
Application granted granted Critical
Publication of FR2383495B1 publication Critical patent/FR2383495B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/04—Frequency
    • G01H3/08—Analysing frequencies present in complex vibrations, e.g. comparing harmonics present
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders

Abstract

An acoustic spectral density integrating circuit comprises a bank of eight pass band filters (41) to (48) which pass frequencies in the bands 50-200, 200-400, 400-800, etc. The filters feed parallel circuits comprising respective rectifying and integration components (5) and (6). Signal levels are monitored in meters (7) prior to application to a ratio circuit (10) where each signal is divided by the sum of the whole eight integrated output to yield measurements on meters (8.1, 8.2, ...8.8) of the proportional frequency content of each pass band. The logic circuit incorporate filters, integrators, voltmeters, a summation unit, an inverter and multipliers.
FR7707190A 1977-03-10 1977-03-10 Analyser for acoustic spectral densities - uses eight parallel channel decoders with respective passband filters coupled with logic circuit with integration and summation stages Granted FR2383495A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7707190A FR2383495A1 (en) 1977-03-10 1977-03-10 Analyser for acoustic spectral densities - uses eight parallel channel decoders with respective passband filters coupled with logic circuit with integration and summation stages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7707190A FR2383495A1 (en) 1977-03-10 1977-03-10 Analyser for acoustic spectral densities - uses eight parallel channel decoders with respective passband filters coupled with logic circuit with integration and summation stages

Publications (2)

Publication Number Publication Date
FR2383495A1 true FR2383495A1 (en) 1978-10-06
FR2383495B1 FR2383495B1 (en) 1980-02-29

Family

ID=9187913

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7707190A Granted FR2383495A1 (en) 1977-03-10 1977-03-10 Analyser for acoustic spectral densities - uses eight parallel channel decoders with respective passband filters coupled with logic circuit with integration and summation stages

Country Status (1)

Country Link
FR (1) FR2383495A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995029413A1 (en) * 1994-04-25 1995-11-02 Minnesota Mining And Manufacturing Company Vehicle classification system using a passive audio input to a neural network

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995029413A1 (en) * 1994-04-25 1995-11-02 Minnesota Mining And Manufacturing Company Vehicle classification system using a passive audio input to a neural network
US5619616A (en) * 1994-04-25 1997-04-08 Minnesota Mining And Manufacturing Company Vehicle classification system using a passive audio input to a neural network

Also Published As

Publication number Publication date
FR2383495B1 (en) 1980-02-29

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