Universal filter

Abstract

The invention discloses a universal filter, comprising a data delay register unit, a time division multiplexing logic operation accumulation unit and a saturation operation unit, wherein the data delay register unit comprises two input ends and four output ends; the time division multiplexing logic operation accumulation unit comprises five data input ends and five filter parameter input ends; thetime division multiplexing logic operation accumulation unit is configured to output a second difference value at the last four beats of the predetermined beats of a clock signal, and the second difference value is obtained by subtracting the fourth and fifth products from the sum value of the first, second and third products, wherein the first product is a product of a digital input signal and afirst filter parameter; the second / third product is a product of a first / second delay digital input signal and a second / third filter parameter; and the fourth / fifth product is a product of a first / second delay digital output signal and a fourth / fifth filter parameter; and the saturation operation unit is configured to obtain a digital output signal according to the second difference value. By implementing the scheme of the invention, chip resources can be effectively saved, and data input signals can be effectively processed.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a general-purpose filter. Background technique [0002] As a basic module, filters are widely used in chips such as amplifiers, analog-to-digital converters, digital-to-analog converters, radio frequency, and sensors. The design of the general-purpose filter can flexibly obtain high-pass, low-pass, band-pass, and band-notch filters according to the configuration. The filter design can effectively process the filtering of digital signals and has been widely used. The transfer function of the general filter can be expressed as: [0003] [0004] By configuring b0, b1, b2, a1, and a2, different filter effects can be realized for the input signal whose frequency increases or decreases with time. figure 1 The design shown in the prior art shows that at least five multipliers, two accumulators, a signed saturation operation unit and a delay register unit are required. The resourc...

AI Technical Summary

Problems solved by technology

The resource occupation is quite large, and it is difficult to meet the requirements of chip miniaturization and high efficiency in the field of audio design

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