An Interpolation Filter Processing Method for Arbitrary Sampling Rate Conversion
A technology of interpolation filtering and processing methods, applied in the direction of impedance network, digital technology network, electrical components, etc., can solve the problems of continuous variable data rate, large number of filter stages, and poor practicability, etc., to overcome hardware The effect of platform limitation, less hardware resources, and strong practicability
Active Publication Date: 2017-08-29
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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[0025] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0026] Such as figure 1 Shown in the shown processing flow diagram of the present invention, the interpolation filtering processing method of arbitrary sampling rate conversion of the present invention comprises the following steps:
[0027] (1), according to the bandwidth Bw of input signal and the signal resolution parameter K of setting, generate K group of FIR filter coefficients, and described K group of filter coefficients are saved in the FIR filter tap coefficient table; Wherein, all The above signal resolution parameter K=2 L , L is a positive integer; the specific implementation steps are as follows:
[0028] (1a), according to the signal bandwidth Bw, generate a group of tap coefficients h(n) of the FIR filter satisfying the filtering requirements in the signal bandwidth, wherein, n=1, 2,..., N, N is the FIR filter The number of ta...
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The invention relates to an arbitrary sampling rate conversion interpolation filtering processing method. The method comprises a first step of generating a finite impulse response (FIR) filter tap coefficient table according to a bandwidth requirement and a filtering precision coefficient of an input signal; a second step of generating a doubled data clock signal by a numerically controlled oscillator (NCO), and acquiring a clock phase-Phase of the clock signal; a third step of receiving a signal by the doubled data clock signal; a fourth step of extracting corresponding filtering coefficient from the FIR filter coefficient table according to the clock phase-Phase; and a fifth step of applying the extracted filtering coefficient in the FIR filter, filtering the received signal, so as to convert the sampling rate of the input signal into system working frequency fs to realize sampling rate conversion interpolation filtering processing. An interpolation filter in the method comprises a transverse FIR filter and a read only memory (ROM) table with the filter coefficient, thereby being simple to realize, costing few hardware source, and having strong practicability.
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 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. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art, and provides a kind of interpolation ...
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IPC IPC(8): H03H17/02
Inventor 罗霞郑建君
Owner BEIJING RES INST OF TELEMETRY