Direct-current filter circuit for realizing ASIC (Application Specific Integrated Circuit) audio processing function

Abstract

The invention relates to a direct-current filter circuit for realizing an ASIC (Application Specific Integrated Circuit) audio processing function. The direct-current filter circuit comprises an input function processing module and an output function feedback module, wherein the input function processing module is used for performing delay phase reversal on an input signal of the direct-current filter circuit and outputting the input signal which is subjected to delay phase reversal together with an input signal of the direct-current filter circuit; and the output function feedback module is used for intercepting a high-order field from an output delay signal of the direct-current filter circuit, performing phase reversal on the output delay signal, and adding the output delay signal which is subjected to phase reversal with an output signal of the input function processing module and the output delay signal of the direct-current filter circuit. Through adoption of the direct-current filter circuit for realizing the ASIC audio processing function disclosed by the invention, a direct-current component in an ASIC audio signal can be removed; moreover, a multiplier is optimized, so that the hardware resource consumption during processing is lowered greatly, and resources accounting for 70 percent of total resources are reduced below 30 percent; and the circuit is simple and practical in structure, has more stable working performance, and is wider in application range.

Description

technical field [0001] The present invention relates to the field of signal processing, in particular to a DC filter circuit, in particular to a DC filter circuit for realizing the audio processing function of an ASIC. Background technique [0002] In the ASIC audio circuit processing circuit, the input signal may have a component close to DC, or the component close to DC may be introduced during the sound effect processing of the audio signal, and this part of the DC signal needs to be removed before the circuit is output. The usual removal method is to pass the signal through an IIR filter circuit, the structure of the IIR filter circuit is as follows figure 1 As shown, such a filter circuit includes a multiplier, two adders, an inverter and two delays. [0003] Since there is a multiplier in the IIR filter that removes the DC component below 1 Hz, the resource consumption is relatively large during the operation of the circuit, and the multiplier accounts for about 70% o...

AI Technical Summary

Problems solved by technology

[0003] Since there is a multiplier in the IIR filter that removes the DC component below 1 Hz, the resource consumption is relatively large during the operation of the circuit, and the multiplier accounts for about 70% of the resources of the entire filter, resulting in excessive resource occupation.

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