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Semi-band filtering method for interpolation filtering in analog-digital conversion

A half-band filter and interpolation filter technology, applied in the field of signal processing, can solve problems such as low data processing efficiency, difficult process design, and complicated data processing methods

Inactive Publication Date: 2007-09-26
TSINGHUA UNIV
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Problems solved by technology

Second, the data formats of different coefficients decomposed and expanded according to base 2 are very different, which makes this design method lack of versatility, and the obtained hardware circuit structure is very irregular, making it difficult to carry out process design
This method can effectively save hardware resources, but it often adopts the practice of sacrificing speed for precision, the timing control circuit is more complicated, and the data processing efficiency is low
At the same time, this method may complicate the original simple data processing method

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  • Semi-band filtering method for interpolation filtering in analog-digital conversion
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[0023] In the half-band filtering method used for interpolation filtering in the digital-to-analog conversion proposed by the present invention, first the half-band filtering continuously receives the input data signal x(n) to be filtered, and performs delay registration to obtain a data signal x(n) to be filtered The registered delay chain, the length of the delay chain is N f / 2+3, where N f is the order of half-band filtering, N f / 2 is odd; add the first and last signals in the registered delay chain to get the signal u 0 (n), the second signal is added to the penultimate signal to obtain the signal u 1 (n), and so on, until the two middle signals are left, and the signals on both sides of the middle two signals are added and recorded as u M-2 (n), where M=(N f +6) / 4, take the 1 / 2 output of the latter signal value in the middle two signals, as the first input signal of the two-to-one multi-way selection in the half-band filter; the signal u 0 (n), u 1 (n)....

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Abstract

The invention relates to a half band filter method which is used in interpolating filter of digital to analog, it belongs to technology field of signal process. This half band filter method adopts mode of coefficient commix base decomposing, and combines concept of multi phase filter, by delaying consignation, adding from beginning to end, sampling and maintaining, weighting and adding, modulating and accelerating, taking out and zooming plus to half band filter. The advantages of the invention are following: the half band filter adopts method of coefficient commix base decomposing, and combines concept of multi phase filter, long shift operation can not be generated, data converting precision can be improved greatly, and complexity degree of program can not be added; using the half band filter of the invention, the design of flow and modularization are easy, and the hardware, territory distribution are more normal, it provides base of research and practice for automatization design and synthesis of filter system.

Description

technical field [0001] The invention relates to a half-band filtering method used for interpolation filtering in digital-to-analog conversion, and belongs to the technical field of signal processing. Background technique [0002] The existing Delta-Sigma digital-to-analog converter is widely used in high-quality audio signal processing chips and multimedia signal processing chips due to its high precision and good integration with digital systems. The interpolation filter is an important part of the Delta-Sigma digital-to-analog converter chip, and its performance has an important impact on the working performance of the entire digital-to-analog converter. The interpolation filter is a digital filter, and the approximation precision of its tap coefficients determines the data conversion precision and hardware complexity of the filter. In various non-multiplier implementation methods, most of the existing technologies approximate the coefficients with the sum of the powers o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
Inventor 陈润刘力源李冬梅
Owner TSINGHUA UNIV
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