Interpolation filtering processing method of arbitrary sampling rate conversion
A technology of interpolation filtering and processing methods, applied in impedance networks, digital technology networks, electrical components, etc., can solve the problems of continuous variable data rate, large number of filter stages, and high resource consumption, to overcome the hardware platform. The effect of limitation, less hardware resources, and simple implementation method
Inactive Publication Date: 2016-02-03
BEIJING RES INST OF TELEMETRY +1
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[0002] In the existing digital interpolation filter design, the signal sampling rate is changed to the system working clock. In order to meet the requirement of variable data rate, one method is to change the DA working clock by reconfiguring the clock chip according to the transmission data rate. , this method is limited by the hardware platform; another method is to use multi-stage filters for integer multiple interpolation filtering for specific rates. This method has many filter stages, complex structure, and consumes huge resources, and the data rate cannot Continuously variable, not very practical
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[0024] Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail:
[0025] like figure 1 As shown in the processing flow block diagram of the present invention, the interpolation filtering processing method for arbitrary sampling rate conversion of the present invention includes the following steps:
[0026] (1), according to the bandwidth Bw of the input signal and the resolution 1 / K of the input signal, generate K groups of filter coefficients, and store the K groups of filter coefficients in the FIR filter tap coefficient table; Wherein, the input signal The resolution parameter K=2 L , L is a positive integer; the specific implementation steps are as follows:
[0027] (1a), according to the signal bandwidth Bw, generate a group of tap coefficients h(n) of the FIR filter that satisfies the filtering requirements within the signal bandwidth, and the filtering requirements refer to the requirements for the r...
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The invention relates to an interpolation filtering processing method of arbitrary sampling rate conversion. The method comprises the following steps of: (1) generating a FIR filter tap coefficient table according to bandwidth requirement and filtering precision coefficient of input signals; (2) generating a double data clock signal Rs by NCO, and obtaining clock phase Phase of the clock signal; (3) executing signal receiving through the double data clock signal; (4) extracting corresponding filter coefficient in a FIR filter coefficient table according to the clock phase Phase; (5) applying the extracted filter coefficient to a FIR filter, filtering the received signal, thereby converting the sampling rate of the input signal to a system work frequency fs from Rs, and realizing interpolation filtering processing of sampling rate conversion. In the method, the interpolation filter used is composed of a transversal FIR filter and a ROM table in which the filter coefficient is bound. The method is simple to implement, consumes less hardware resource and is highly practical.
Description
technical field [0001] The invention relates to the technical field of digital filtering, in particular to an interpolation filtering processing method for arbitrary sampling rate conversion. Background technique [0002] In the existing digital interpolation filter design, the signal sampling rate is changed to the system operating clock. In order to meet the requirement of variable data rate, one method is to change the DA operating clock by reconfiguring the clock chip according to the transmission data rate. , this method is limited by the hardware platform; another method is to use multi-stage filters to perform integer multiple interpolation filtering for specific rates. This method has many filter stages, complex structure, huge resource consumption, and the data rate cannot be Continuously variable and not very practical. SUMMARY OF THE INVENTION [0003] The object of the present invention is to overcome the deficiencies of the prior art, and to provide an interp...
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IPC IPC(8): H03H17/02
Inventor 罗霞郑建君
Owner BEIJING RES INST OF TELEMETRY