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
View PDF1 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Waveform equalizing device
  • Waveform equalizing device
  • Waveform equalizing device

Examples

Experimental program
Comparison scheme
Effect test

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap