Self-adaptive filtering method and related device

A technology of equipment and filter coefficients, applied in the field of processing input signals, can solve problems such as training sequence destruction, and achieve the effect of efficient use

Inactive Publication Date: 2008-11-05
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The received training sequence may be corrupted

Method used

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  • Self-adaptive filtering method and related device
  • Self-adaptive filtering method and related device
  • Self-adaptive filtering method and related device

Examples

Experimental program
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Embodiment Construction

[0023] figure 2 is a block diagram of an embodiment of a data processing apparatus 200 according to the invention. The device 200 comprises a filter circuit F for filtering a digital input signal Sin to generate a digital output signal Sout. The filter circuit F has a set C, which is composed of m adjustable filter coefficients whose values ​​are C0(n), C1(n), . . . Cm-1(n) at discrete time n. Said coefficients are adjustable, ie their values ​​can be changed. For example, as shown in the example below, the coefficients are adaptive coefficients, so filter F is an adaptive filter.

[0024] The device 200 may be part of a receiver that receives an input signal Sin output by a transmitter and transmitted over a communication channel. The device 200 completes the equalization of the signal Sin. In training equalization, transmissions at the transmitter end on the input signal Sin include transmissions in Sin that include the reference signal Sref as part of the input signal ...

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Abstract

An input signal is filtered for creating an output signal using an adaptive filter. An error signal is derived from the output signal. The adaptive filter has coefficient whose value can be modified. A value of a coefficient is modified using a derived updating amount. The updating amount is obtained from the product of a value of the input signal, a value of the polarity of the error signal, and a step gain. The step gain has the form 2 with K being an integer and being dependent on a magnitude of the value of the error signal and on a step gain parameter. The updating amount is dependent on both the magnitude and the polarity of the error signal, therefore allowing a precise update of the coefficient. The specific form of the step gain allows a fast derivation of the product.

Description

technical field [0001] The invention relates to a method of processing an input signal. It also relates to corresponding data processing devices for carrying out the method. [0002] In particular, the invention relates to the processing of video or audio data subject to distortion during transmission over a communication channel. Background technique [0003] Hereinafter, the symbol "A" denotes a signal A, and "A(n)" denotes a digitized value of the signal A at a discrete time n. [0004] The input signal Sin may represent any type of digital video, audio or communication data. Signal Sin represents eg video or audio data. The input signal Sin may be an intermediate frequency modulated by compressed video data generated by the base station. The signal is transmitted from the base station to the receiver via a terrestrial broadcast, cable or satellite channel. During transmission, the signal Sin may be affected by different forms of distortion. The transmitted input si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H21/00
CPCH03H21/0043H03H17/0027H03H21/0012
Inventor V·L·戈斯泰恩G·图尔科尼奇
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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