Farrow filter based on logic circuit and implementation method for Farrow filter

A logic circuit and filter technology, applied in the field of communication, can solve the problems of not supporting online configuration rate, the Farrow filter hardware architecture is not flexible enough, etc., to achieve the effect of enhancing market competitiveness and reducing hardware resource occupation

Inactive Publication Date: 2012-04-11
NANJING ZHONGXING XIN SOFTWARE CO LTD
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Problems solved by technology

[0015] Aiming at the problem that the above-mentioned existing Farrow filter hardware architecture is not flexible enough and does not support online configuration rate, the present invention provides a logic circuit-based Farrow filter and its implementation method to at least solve the above problems

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  • Farrow filter based on logic circuit and implementation method for Farrow filter
  • Farrow filter based on logic circuit and implementation method for Farrow filter
  • Farrow filter based on logic circuit and implementation method for Farrow filter

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Embodiment Construction

[0044] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0045] The embodiment of the present invention provides a logic circuit-based Farrow filter and its implementation method. The technology applies the Farrow filter to the logic circuit, so as to improve the computing capability of the Farrow filter for real-time processing.

[0046] When using logic circuits to implement Farrow filters, at least the following issues need to be considered:

[0047] 1. Time coefficient μ l and μ k It can be seen from the mathematical model that these two time coefficients are real-time changing floating-point data determined by the input and output sampling rates, and it is necessary to perform fixed-point processing and real-time online calculation of the time coeff...

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Abstract

The invention discloses a Farrow filter based on a logic circuit and an implementation method for the Farrow filter. The Farrow filter comprises a gating switch for controlling a working mode of the Farrow filter according to proportional relation between a configured input data sampling rate and a configured output data sampling rate, an interpolation filtering device for performing interpolation filtering on input data under the control of the gating switch, and performing bit-cutting operation on middle data during interpolation filtering according to a first set bit width to acquire a first type of fixed point data, and an extraction filtering device for performing extraction filtering on the input data under the control of the gating switch, and performing the bit-cutting operation on the middle data during extraction filtering according to a second set bit width to acquire a second type of fixed point data. By the Farrow filter, the problem that the conventional Farrow filter does not support online rate configuration because of inflexibility of hardware architecture is solved; and resource occupation rate of hardware is reduced by the bit-cutting operation on the middle data.

Description

technical field [0001] The invention relates to the communication field, in particular to a logic circuit-based Farrow filter and its implementation method. Background technique [0002] The biggest feature of the Farrow filter is that it can use a set of fixed coefficients to realize the transformation of any sampling rate of the signal. Its theoretical basis is based on continuous-time models such as figure 1 shown. [0003] The role of the Farrow filter is to figure 1 The process of is realized entirely in the digital domain: 1) using an ideal DAC and an analog filter h a (t) restore the digital signal x(k) to the quasi-original signal y a (t); 2) for y a (t) Perform re-sampling to obtain the rate-converted digital signal y(l). filter h a The performance of (t) determines the time domain and frequency domain quality of the output signal. [0004] The digitalization of this simulation process can be deduced and proved by mathematical theory, and the mathematical mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/46
CPCH03H17/0642H03H9/46H03H17/0027
Inventor 陈永红岳亮苟春茂
Owner NANJING ZHONGXING XIN SOFTWARE CO LTD
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