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Waveform equalizing device

A waveform equalization and filter technology, applied in transmission control/equalization, gearbox control/balance, television, etc., can solve the problem of time-consuming, reduce the number of taps, prevent the degradation of waveform equalization performance, reduce the circuit area effect

Inactive Publication Date: 2009-06-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] For example, when demodulating a VSB (Vestigial Side Band: Vestigial Side Band) modulated signal, it takes time until the tap coefficients converge to the optimum value in a waveform equalizer composed of an FIR filter and an IIR filter.

Method used

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Embodiment Construction

[0044] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0045] FIG. 1 is a block diagram showing the configuration of a waveform equalizer according to an embodiment of the present invention. The waveform equalizer shown in FIG. 1 includes an FIR filter 10, an IIR filter 20, a pattern signal generation unit 32, a correlation calculation unit 34, an initial tap coefficient generation unit 36, an error detection unit 38, a tap coefficient update unit 42, and an addition unit 44. . Such a waveform equalizer is used, for example, in an ATSC (Advanced Television Systems Committee) VSB (vestigial-sideband) receiver.

[0046] The FIR filter 10 delays the input signal IS, and obtains a plurality of tap values ​​having different delays at predetermined time intervals. The FIR filter 10 uses the obtained tap values, performs convolution computation between the input signal IS and tap coefficients respectively corresponding to these ...

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Abstract

Tap coefficients for a filter for removing a ghost signal are converged to optimum values in a short time. The waveform equalizing device includes: an initial tap coefficient generation section for determining and outputting the initial values of tap coefficients for a FIR filter and an IIR filter based on a plurality of correlation values; and a tap coefficient updating section for outputting the initial values of tap coefficients for the FIR filter and the IIR filter to these filters and updating tap coefficients for these filters based on error information. The initial tap coefficient generation section reverses the order of values, among the plurality of correlation values, corresponding to delays within a predetermined range to determine the order-reversed values as the initial values of tap coefficients for the FIR filter corresponding to the delays within the predetermined range, and also reverses the signs of values, among the plurality of correlation values, corresponding to delays exceeding the predetermined range to determine the sign-reversed values as the initial values of tap coefficients for the IIR filter.

Description

technical field [0001] The invention relates to a waveform equalization device for removing multipath interference in broadcasting or wireless communication. Background technique [0002] Among receivers for broadcasting or wireless communication, there are receivers equipped with waveform equalizers to eliminate multipath interference. The so-called multi-path interference refers to the phenomenon that the broadcast wave reaches the receiver through the main path and other paths respectively, and the interference between the main wave passing through the main path and the reflected wave passing through other paths (virtual image signal) The phenomenon in which waves are observed in a receiver. The waveform equalizer decodes the main wave to be received from the interference wave subjected to multipath interference. [0003] In the waveform equalization device with FIR (finite impulse response: finite impulse response) filter and IIR (infinite impulse response: infinite im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B3/10
CPCH04B3/10H04L25/03076H04L2025/03484H04L2025/03617H04L2025/03605H04N5/211H04B7/005
Inventor 高野遥熊泽町也
Owner PANASONIC CORP
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