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digital filter

A technology of digital filters and filter coefficients, applied in the field of digital signals, to achieve the effects of flexible selection, resource saving, and bit width data reduction

Active Publication Date: 2020-03-27
SHANGHAI FUDAN MICROELECTRONICS GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is how to simplify the structure of the digital filter, reduce the number of addition and subtraction operations, and reduce the consumption of logic resources

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Embodiment Construction

[0024] In some application scenarios, the coefficients of the filter may be special. For example, in the field of smart card communication, the signal sent from the card to the card machine uses a square wave with a frequency of 848KHz as the subcarrier, and the baseband signal is first modulated onto the subcarrier, and then modulated onto the RF carrier with a frequency of 13.56MHz. When the card machine receives the signal, it usually removes the RF carrier at the analog front end, then samples it through the ADC, and demodulates it with a digital circuit. At this point, digital demodulation usually uses a matched filter method to detect subcarriers in the received signal. Wherein, the matched filter may select N subcarriers as filter coefficients as required.

[0025] For example, the coefficients of the matched filter correspond to 16 sampling points [1 1 1 1 -1 -1 -1 -1 1 1 1 1 -1 -1-1 -1], where the high level of the subcarrier corresponds to the sampling point 1, the...

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Abstract

The invention relates to a digital filter. The set of filter coefficients corresponding to the digital filter is a set A; the number N of elements in the set A satisfies an equation that N=2n*m; and as for any i, the set of the first 2<n-i>*m elements in the set A is in a proportional relation with the set of adjacent 2<n-i>*m elements. The digital filter includes (n+1) series filtering units; andin n filtering units, the i-th filtering unit includes a 2<i-1>*m delay units, one adder and one multiplier, and the remaining one filtering unit includes m-1 delay units, m-1 adders and m multipliers, wherein i and n satisfy a relational expression that 1<=i<=n, m and n are both integers, and m is larger than 1. With the above technical schemes of the invention adopted, the structure of the digital filter can be simplified, the number of the times of the operation of addition and subtraction can be decreased, and the consumption of logical resources can be reduced.

Description

technical field [0001] The invention relates to the field of digital signals, in particular to a digital filter. Background technique [0002] A digital filter is an algorithm or device composed of a digital multiplier, an adder and a delay unit. The function of the digital filter is to process the digital signal of the input discrete signal to achieve the purpose of changing the frequency spectrum. [0003] In the prior art, for a finite impulse response filter (Finite Impulse Response, FIR), its expression is Among them, Y n is the output of the digital filter, x i is the input of the digital filter, a i is the coefficient of the digital filter, and the corresponding system transfer function is [0004] refer to figure 1 , the circuit structure diagram of an existing general-purpose digital filter is given, where Z -1 Indicates a delay of one clock cycle, which is represented as a flip-flop in circuit implementation. When the sampling points corresponding to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02H03H17/06
Inventor 李夏禹陆继承赵晓冬王椿珊张幸幸
Owner SHANGHAI FUDAN MICROELECTRONICS GROUP
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