Apparatus and method for eliminating blasting noise of digital-analog converter

A digital-to-analog converter, blasting noise technology, applied in the direction of physical parameter compensation/prevention, delta modulation, etc., can solve problems such as noise

Inactive Publication Date: 2009-04-15
苏州顺芯半导体有限公司
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  • Summary
  • Abstract
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Problems solved by technology

[0015] The purpose of the present invention is to propose a new numerical control noise elimination device and method, to eliminate the popping (Pop_Click) noise caused in the audio digital-to-analog converter switching and power-on and power-on processes, to solve the problem of audio digital-to-analog converter DAC noise problem

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  • Apparatus and method for eliminating blasting noise of digital-analog converter
  • Apparatus and method for eliminating blasting noise of digital-analog converter

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Embodiment Construction

[0063] Below in conjunction with accompanying drawing 1 and figure 2 The specific implementation of the method for eliminating the pop (Pop_Click) noise caused by the switching of the working mode in the digital-to-analog converter of the present invention will be described in detail.

[0064] Described digital-to-analog converter DAC comprises the following modules: audio serial interface 11, chip state machine 21, noise elimination control unit 31, serial control port 23, the sampling rate detection / clock manager 22 that connects CLKIN pin pin, volume Control unit 12, de-emphasis / interpolation filter 13, multi-bit sigma-delta regulator DSM and dynamic element matching unit DEM 14, low-pass filter (analog switched capacitor filter SCF) 15, mixer 16, output amplifier driver unit 17 , selector 18 and analog reference voltage generator 24 .

[0065] The chip state machine 21 controls the working mode of the chip and the switching procedures of each unit circuit under different ...

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Abstract

The invention relates to a device for eliminating the Pop_Click noise caused by switching working mode in a DAC and a method thereof. The device comprises a chip state machine, a volume control unit, a de-emphasis/interpolation filter, a multidigit Sigma-Delta regulator and a dynamic element matching unit, a low-pass filter, a sound mixer, an output amplifying and driving unit, a selector and a noise eliminating control unit; in the working mode switching process of the chip, the noise eliminating control unit controls the volume control unit, the sound mixer and the gain change of the output amplifying driver. The invention solves the problem that voltage jump exists at the analog output terminal of an audio DAC, thus the problem that Pop_Click noise exists in the switching between normal mode and standby mode and in the electrifying and deenergizing process of the audio DAC.

Description

technical field [0001] The invention relates to the field of audio digital-to-analog conversion (DAC), in particular to a device and method for eliminating pop (Pop_Click) noise caused in the power-on and power-off process and working mode switching of the audio digital-to-analog converter. Background technique [0002] Sigma-delta data conversion technology is a technology widely used in high-precision audio digital-to-analog conversion. The audio digital-to-analog converter using Σ-Δ data conversion technology is mainly composed of the following modules: audio serial interface, chip state machine, serial control port, sampling rate detection / clock manager connected to CLKIN pin, volume control unit, De-emphasis / interpolation filter, multi-bit sigma-delta regulator DSM with dynamic element matching unit DEM, low-pass filter (analog switched capacitor filter SCF), mixer, output amplifier drive unit, selector and analog reference voltage generator. Figure 1 shows a block di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/02H03M1/08
Inventor 李跃辉於清张保华凌青王燕林坤
Owner 苏州顺芯半导体有限公司
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