Encoding and decoding of audio signals using complex-valued filter banks

An audio signal and filter bank technology, applied in the field of audio signal encoding and/or decoding, can solve problems such as expensive computational complexity, and achieve the effects of reducing computational resource requirements, improving performance, and reducing complexity

Active Publication Date: 2011-08-10
KONINKLIJKE PHILIPS ELECTRONICS NV +1
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  • Abstract
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Problems solved by technology

This is relatively expensive due to computational complexity

Method used

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  • Encoding and decoding of audio signals using complex-valued filter banks
  • Encoding and decoding of audio signals using complex-valued filter banks
  • Encoding and decoding of audio signals using complex-valued filter banks

Examples

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Embodiment Construction

[0079] figure 1 Described is a transmission system 100 for communicating audio signals according to some embodiments of the present invention. The transmission system 100 comprises a transmitter 101 coupled to a receiver 103 via a network 105, which may in particular be the Internet.

[0080] In this particular example, the transmitter 101 is a signal recording device and the receiver is a signal playback device 103, but it is understood that in other embodiments the transmitter and receiver may be used in other applications and for other purposes. For example, the transmitter 101 and / or the receiver 103 may be part of a transcoding function and may, for example, provide for interaction with other signal sources or destinations.

[0081] In a specific example in which a signal recording function is supported, the transmitter 101 includes a digitizer 107 that receives an analog signal and converts it into a digital PCM signal by sampling and analog-to-digital conversion.

[00...

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Abstract

An encoder (109) comprises a receiver (201) which receives a time domain audio signal. A filter bank (203) generates a first subband signal from the time domain audio signal where the first subband signal corresponds to a non-critically sampled complex subband domain representation of the time domain signal. A conversion processor (205) generates a second subband signal from the first subband signal by subband processing. The second subband signal corresponds to a critically sampled complex subband domain representation of the time domain audio signals. An encode processor (207) then generates a waveform encoded data stream by encoding data values of the second subband signal. The conversion processor (205) generates the second subband signal by direct subband conversion without converting back to the time domain. The invention allows an oversampled subband signal typically generated in parametric encoding to be waveform encoded with reduced complexity. A decoder performs the inverse operation.

Description

technical field [0001] The present invention relates to encoding and / or decoding of audio signals, in particular to waveform encoding / decoding of audio signals. Background technique [0002] Digital encoding of various source signals has become increasingly important over the past few decades as digital signal representation and communication has gradually replaced analog representation and communication. For example, mobile telephone systems are based on digital speech coding, such as the Global System for Mobile Communications. Moreover, the distribution of media content, such as video and music, is also increasingly based on digital content encoding. [0003] Traditionally, audio coding has mainly used waveform coding, where the underlying waveform has been digitized and encoded efficiently. For example, a typical waveform encoder includes a filter bank that converts the signal into a frequency subband domain. Based on the pseudo-acoustic model, a masking threshold is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/14
CPCG10L19/0204G10L19/02H03M7/30
Inventor L.F.威勒摩斯E.G.P.舒伊杰斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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