Low complexity spectral band replication (SBR) filterbanks

A technology of spectral band replication and filter banks, applied in the direction of digital filters, filters, instruments, etc.

Inactive Publication Date: 2012-03-21
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In general, filter banks and transforms contribut...

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  • Low complexity spectral band replication (SBR) filterbanks
  • Low complexity spectral band replication (SBR) filterbanks
  • Low complexity spectral band replication (SBR) filterbanks

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Embodiment Construction

[0034] Various embodiments are now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It can be evident, however, that the embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

[0035] Exemplary mobile device with audio codec

[0036] figure 1 Is a block diagram illustrating an example of a mobile device suitable for communicating over a wireless network. The mobile device 102 may include processing circuitry 104 coupled to an audio codec 106 and a wireless communication transceiver 108 . Wireless communication transceiver 108 allows the mobile device to transmit and / or receive comm...

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Abstract

A complex analysis filterbank is implemented by obtaining an input audio signal as a plurality of N time-domain input samples. Pair-wise additions and subtractions of the time-domain input samples is performed to obtain a first and second groups of intermediate samples, each group having N/2 intermediate samples. The signs of odd-indexed intermediate samples in the second group are then inverted.A first transform is applied to the first group of intermediate samples to obtain a first group of output coefficients in the frequency domain. A second transform is applied to the second group of intermediate samples to obtain an intermediate second group of output coefficients in the frequency domain. The order of coefficients in the intermediate second group of output coefficients is then reversed to obtain a second group of output coefficients. The first and second groups of output coefficients may be stored and/or transmitted as a frequency domain representation of the audio signal.

Description

[0001] Claim of priority under 35 U.S.C. §119 [0002] This patent application asserts the title of "Fast SBR filterbanks for AAC-ELD, HE-AAC, and USAC" filed on April 14, 2009, for AAC-ELD, HE-AAC, and USAC Priority to U.S. Provisional Application No. 61 / 169,132, assigned to the assignee of the present invention, and expressly incorporated herein by reference. technical field [0003] The following description generally relates to encoders and decoders, and in particular to applications such as High Efficiency Advanced Audio Coding (HE-AAC), Enhanced Low Delay (ELD), Spatial Audio (SAOC), and Unified Speech and Audio ( Computationally efficient filter bank structure for the MPEG family of audio codecs for the USAC) codec. Background technique [0004] One goal of audio coding is to compress an audio signal to a desired limited amount of information, while maintaining as much of the original sound quality as possible. In the encoding process, an input audio signal in the ...

Claims

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Application Information

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IPC IPC(8): G10L19/02H03H17/02
CPCH03H17/0227G10L19/022H03H17/0213G10L21/02H03H2218/04G10L25/18G10L19/0204G10L19/0212H03H17/0266H03H17/0272G10L19/02H03H17/02H03M7/30
Inventor 拉维·基兰·基辅库拉尤里娅·列兹尼克
Owner QUALCOMM INC
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