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1. WO2014153606 - AUDIO FILTERING WITH VIRTUAL SAMPLE RATE INCREASES

Publication Number WO/2014/153606
Publication Date 02.10.2014
International Application No. PCT/AU2014/000319
International Filing Date 26.03.2014
Chapter 2 Demand Filed 23.09.2014
IPC
H04R 1/20 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
1Details of transducers
20Arrangements for obtaining desired frequency or directional characteristics
H03H 17/00 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
17Networks using digital techniques
G06F 17/17 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
17Digital computing or data processing equipment or methods, specially adapted for specific functions
10Complex mathematical operations
17Function evaluation by approximation methods, e.g. interpolation or extrapolation, smoothing or least mean square method
G01R 23/167 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
23Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
16Spectrum analysis; Fourier analysis
165using filters
167with digital filters
CPC
G06F 3/165
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
3Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
16Sound input; Sound output
165Management of the audio stream, e.g. setting of volume, audio stream path
G06T 2207/20024
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
2207Indexing scheme for image analysis or image enhancement
20Special algorithmic details
20024Filtering details
G06T 2207/20172
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
2207Indexing scheme for image analysis or image enhancement
20Special algorithmic details
20172Image enhancement details
G06T 5/00
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
5Image enhancement or restoration
G10L 21/0332
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
21Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
02Speech enhancement, e.g. noise reduction or echo cancellation
0316by changing the amplitude
0324Details of processing therefor
0332involving modification of waveforms
H03H 17/0248
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
17Networks using digital techniques
02Frequency selective networks
0248Filters characterised by a particular frequency response or filtering method
Applicants
  • BARRATT, Lachlan, Paul [AU]/[AU]
Inventors
  • BARRATT, Lachlan, Paul
Agents
  • PHILLIPS ORMONDE FITZPATRICK
Priority Data
61/805,40626.03.2013US
61/805,43226.03.2013US
61/805,44926.03.2013US
61/805,46326.03.2013US
61/805,46626.03.2013US
61/805,46926.03.2013US
61/819,63005.05.2013US
61/903,22512.11.2013US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) AUDIO FILTERING WITH VIRTUAL SAMPLE RATE INCREASES
(FR) FILTRAGE AUDIO AVEC AUGMENTATION DE LA FRÉQUENCE D'ÉCHANTILLONNAGE VIRTUELLE
Abstract
(EN)
The present invention relates broadly to a method of digitally filtering an audio signal at a predetermined sample rate by applying a composite audio filter derived at an increase sample rate. The composite audio filter is obtained by combining one audio filter with another audio filter at the increased sample rate. The sample rate of the audio filters may be increased from their predetermined to the increased sample rate using various weighting techniques. The composite filter may provide a frequency response curve with a corner frequency as it approaches the Nyquist frequency whereas the frequency response of a conventional filter (shown in broken line detail) is flat with no effect.
(FR)
La présente invention concerne un procédé consistant à filtrer un signal audio numériquement à une fréquence d'échantillonnage prédéterminée en appliquant un filtre audio composite dérivé à une fréquence d'échantillonnage augmentée. Le filtre audio composite est obtenu en combinant un filtre audio à un autre filtre audio à la fréquence d'échantillonnage augmentée. La fréquence d'échantillonnage des filtres audio peut être augmentée, de leur fréquence d'échantillonnage prédéterminée à la fréquence d'échantillonnage augmentée, au moyen de divers procédés de pondération. Le filtre composite peut fournir une courbe de réponse en fréquence avec une fréquence de coupure à mesure que l'on s'approche de la fréquence de Nyquist tandis que la réponse en fréquence d'un filtre classique (en pointillés) est plate et sans effet.
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