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DAC post-filtering system based on Butterworth filter

A post-filtering and filter technology, which is applied in the direction of sensors, transducer circuits, sensor components, etc., can solve the problems of high hardware cost, popping sound, weak anti-interference ability, etc., and achieve the effect of reducing hardware cost

Pending Publication Date: 2022-04-15
深圳万正芯源有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a DAC post-filtering system based on Butterworth filter to solve the problems of complex circuit structure, high hardware cost, weak anti-interference ability and plosive sound in the prior art proposed in the above-mentioned background technology

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  • DAC post-filtering system based on Butterworth filter
  • DAC post-filtering system based on Butterworth filter
  • DAC post-filtering system based on Butterworth filter

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The specific embodiments described here are only used to explain the present invention, not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0031] The present invention provides such Figure 1~3 A DAC post-filtering system based on a Butterworth filter is shown, including a PCM1789 audio DAC, a Butterworth low-pass filter, and a drv632. The Butterworth low-pass filter is composed of a multiple feedback (MFB) with appropriate parameters The topology circuit is created. The PC...

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Abstract

The invention discloses a Butterworth filter-based DAC (Digital-to-Analog Converter) post-filtering system, which comprises a PCM1789 audio DAC, a Butterworth low-pass filter and drv632, and is characterized in that the Butterworth low-pass filter is created by a multi-feedback topological circuit with proper parameters. According to a transfer function of a single-ended input MFB circuit and a transfer function of a second-order Butterworth low-pass filter, the relationship between passband direct-current gains H0, a1 and b1 and C1, C2, fc, R1, R2 and R3 is calculated, then the R1, R2 and R3 are further calculated by combining actual performance requirements of a Bluetooth DVD player, the Butterworth low-pass filter is used as a post-filter of a DAC, the output of the DAC is smoothed, and the Bluetooth DVD player is obtained. And a drv632 is accessed by utilizing a symmetrical structure, so that the audio digital-to-analog converter with a simple circuit structure is formed, 2Vrms output is provided, the hardware cost is reduced, and sound attenuation processing is carried out on shock-wave generated by a front-end circuit.

Description

technical field [0001] The invention belongs to the technical field of audio digital-to-analog conversion circuits, and in particular relates to a DAC post-filter system based on a Butterworth filter. Background technique [0002] The current audio signal is mainly divided into digital audio signal and analog audio signal. Among them, digital audio signal is mainly used to store and transmit audio signal, and analog audio signal is the output form of actual audio signal. It is self-evident that the conversion of digital audio signal to analog audio signal is an indispensable and important operation in the field of audio processing; [0003] But in fact, the audio digital-to-analog converter DAC has disadvantages such as complex circuit structure, high hardware cost, weak anti-interference ability, and plosive sound. Contents of the invention [0004] The purpose of the present invention is to provide a DAC post-filtering system based on Butterworth filter to solve the pro...

Claims

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Application Information

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IPC IPC(8): H03M1/66H03H11/04H04R3/00
Inventor 张正
Owner 深圳万正芯源有限公司
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