Linear predictive coding of an audio signal

A linear predictive coding, audio signal technology, applied in speech analysis, instruments, etc., can solve problems such as expensive, complex calculation, inflexibility, etc., to achieve effective adaptation, improve coding quality, and reduce complexity.

Inactive Publication Date: 2009-06-17
KONINKLIJKE PHILIPS ELECTRONICS NV
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Problems solved by technology

[0007] However, although this method allows the use of linear prediction for audio coding that takes psychoacoustic masking into account, it also has a number of disadvantages
In particular, this method requires the execution of a psychoacoustic model for e

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  • Linear predictive coding of an audio signal
  • Linear predictive coding of an audio signal
  • Linear predictive coding of an audio signal

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Embodiment Construction

[0058] FIG. 1 shows a transmission system 100 for audio signal communication according to some embodiments of the 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.

[0059] In this particular example, the transmitter 101 is a signal recording device and the receiver is a signal playback device 103, but it should be 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 receiver 103 may be part of the decoding function and may, for example, provide an interface to other signal sources or destinations.

[0060] In this particular example where a signal recording function is supported, the transmitter 101 includes a digitizer 107 that receives an analog signal that is converted to a digital PCM signal by sampling and analog-to-digital conversion.

[0061] The digitizer ...

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Abstract

An apparatus for linear predictive coding of an audio signal comprises a segmentation processor (201) which generates signal segments for the audio signal. An autocorrelation processor (401) for generates a first autocorrelation sequence for each signal segment and a modification processor (403) generates a second autocorrelation sequence for each signal segment by modifying the first autocorrelation sequence in response to at least one psychoacoustic characteristic. A prediction coefficient processor (405) determines linear predictive coding coefficients for each signal segment in response to the second autocorrelation sequence. The invention allows a low complexity linear encoding which takes into account psychoacoustic considerations thereby allowing an improved perceived coding quality for a given data rate.

Description

technical field [0001] The invention relates to linear predictive coding of audio signals. Background technique [0002] Digital encoding of various source signals has become increasingly important over the past few decades, as the representation and communication of digital signals has gradually replaced analog representation and communication. For example, mobile telephone systems such as the Global System for Mobile Communications are based on digital speech coding. In addition, the distribution of media content such as video and music is also more based on digital content encoding. [0003] In content coding and especially in audio and speech coding, linear predictive coding is a frequently employed tool because it provides high quality for low data rates. Linear predictive coding has traditionally been applied primarily to individual signals, but it can also be used for multi-channel signals, such as stereo audio signals. [0004] Linear predictive coding achieves ef...

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Application Information

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IPC IPC(8): G10L19/06G10L21/02G10L21/0264
CPCG10L21/0264G10L19/06
Inventor A·C·登布林克
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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