Order adaptive finite impulse response filter and operating method thereof

Abstract

The present invention discloses a device which can adaptively adjust the exponent number of finite impulse response wave filter with a specific use, wherein the device comprises the following components: a plurality of specific finite impulse response wave filter with a fixed exponent number each, at least one unspecific finite impulse response wave filter with a fixed exponent number, a control unit and an evaluating unit. At least one unspecific finite impulse response wave filter visibly interfere the response intensity and is connected with at least one in the plurality of specific finiteimpulse response wave filter in series thereby providing excellent signal quality.

Description

technical field [0001] The present invention relates to a device and method for allocating digital filter resources, in particular to a device and method for adaptively allocating digital filter resources according to parameters related to determining digital filter order (tap number). Background technique [0002] The constituent elements of the digital filter include adders, multipliers and / or delay elements, etc., which are different from the constituent elements of the analog filter such as resistors, capacitors, and inductors. Since digital filters have temperature constancy, such as adders, multipliers, and delay elements are not sensitive to temperature changes, so as long as the parameters of digital filters are properly determined, certain accuracy and stability can be achieved. . [0003] Generally speaking, digital filters include finite impulse response (finite impulse response) filters and infinite impulse response (infinite impulse response) filters. Taking N-...

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Problems solved by technology

Since the order of the finite impulse response filter is designed as a fixed order in the circuit design stage depending on the application situation, when the finite impulse response filter is actually used in different applications, the signal quality may be different due to, for example, the quality of the communication line , line length or communication environment and other changing factors, it is impossible to obtain a good filtering effect, that is, the finite impulse response filter whose order is fixed in advance cannot adapt to the interference under the environmental change, or in order to deal with the worst case. Too many filter order designs cause unnecessary waste

For example, when the M-order finite impulse response filter resources are fixedly used to deal with echo interference, and the M-order finite impulse response filter resources are fixedly used to deal with near-end crosstalk, when the echo interference is slight and less than M-order resources are required However, when the near-end crosstalk is serious and requires more than M-order resources for filtering, it will cause waste in echo interference processing, but the filtering effect will be insufficient in near-end crosstalk processing.

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