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Directional audio signal processing using an oversampled filterbank

a filterbank and audio signal technology, applied in the field of audio signal processing applications, can solve the problems of requiring more processing, poor b>5/b> frequency resolution, and time-domain approaches that generally provide poor performan

Inactive Publication Date: 2008-05-15
SEMICON COMPONENTS IND LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enables powerful directional processing on low-power devices, enhancing listening comfort, speech recognition accuracy, and reducing power consumption while maintaining high fidelity, particularly in hearing aids and speech recognition systems.

Problems solved by technology

To deal with complex broadband signals such as speech however, these time-domain approaches generally provide poor performance unless significant extra resources, such as large microphone arrays, lengthy filters complex post-filtering, and high processing power are committed to the application.
However, many of these EFT-based approaches suffer from wide sub-bands that are highly overlapped, and therefore provide poor 5 frequency resolution.
They also require longer group delays and more process in, power in computing the EFT.

Method used

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  • Directional audio signal processing using an oversampled filterbank
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  • Directional audio signal processing using an oversampled filterbank

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Embodiment Construction

[0030] Turning now to FIG. 4 an adaptive beamformer system embodying the invention in block diagram form is shown. Note that it is assumed that the outputs of the I, microphones 400 (L≧2) are already converted to digital form by a set of analogue-to-digital converters (ADC) (not shown). Similarly, the output is assumed to be converted from digital form by an digital-to-analogue converter (DAC) (not shown) to produce an appropriate output signal 490. The digitized outputs of the L microphones 400 are first combined in a combination matrix 415. The combination matrix 415 can be any Finite Impulse Response (FIR) filter with multiple input and outputs (the number of outputs M being less or equal to the number of inputs L (M≦L)). Suitable matrices include a delay-and-sum network, a sigma-delta network and a one-to-one mapping of the inputs to the outputs (for example some general matrix through which L inputs are transformed into L (i.e. M=L) outputs)). The M outputs of the combination m...

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Abstract

A directional signal processing system for beamforming information signals. The system includes an oversampled filterbank, which has an analysis filterbank for transforming the information signals in time domain into channel signals in transform domain, a synthesis filterbank and a signal processor. The signal processor processes the outputs of the analysis filterbank for beamforming the information signals. The synthesis filterbank transforms the outputs of the signal processor to a single information signal in time domain.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to copending Canadian Patent Application entitled, “Directional Audio Signal Processing Using an Oversampled Filterbank,” having serial number 2,354,858, filed Aug. 8, 2001, which is entirely incorporated herein by reference. This application is a Continuation-In-Part application of U.S. patent application Ser. No., 10 / 214,350 filed on Aug. 7, 2002, which has been allowed and which is incorporated by reference herein in its entirety.FIELD OF THE INVENTION [0002] The present invention relates to audio signal processing applications where the direction of arrival of the audio signal(s) is the primary parameter for signal processing. The invention can be used in any application that requires the input audio signal(s) to be processed based on the spatial direction from which the signal arrives. [0003] Application of this invention includes, but is not limited to audio surveillance systems, hearing aids, voic...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04R3/00G10L15/20G10L21/0232H04R1/40H04R25/00
CPCH04R3/005H04R25/507H04R25/407H04R25/405
Inventor BRENNAN, ROBERT L.CHAU, EDWARDNADJAR, HAMID SHEIKHZADEHSCHNEIDER, TODD
Owner SEMICON COMPONENTS IND LLC
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