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Digital signal generator for reducing audio artifacts

A digital signal and generator technology, applied in audio amplifiers, low-frequency amplifiers, improved amplifiers to reduce noise effects, etc.

Pending Publication Date: 2022-05-06
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These artifacts can occur, for example, when an audio amplifier is switched on or off, or due to muting or unmuting

Method used

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  • Digital signal generator for reducing audio artifacts
  • Digital signal generator for reducing audio artifacts
  • Digital signal generator for reducing audio artifacts

Examples

Experimental program
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Embodiment Construction

[0032] figure 1 An audio amplifier system 100 including a digital signal generator 120 is shown according to an embodiment. The audio amplifier system 100 may also include a digital-to-analog converter (DAC) 122 , an amplifier stage 126 , which may be, for example, a class A, AB, or D amplifier, and a speaker 130 .

[0033] The digital signal generator 120 may include a controller 112 , an integrator 114 , a counter module 110 and a comparator 108 . Controller 112 may have reset output 102 coupled to counter module 110 and integrator 114 . Controller 112 may have an input connected to counter output 116 . Counter output 116 may be connected to a first input of comparator 108 and an input of integrator 114 . Controller 112 may have threshold output 106 connected to a second input of comparator 108 . Comparator output 104 may be connected to up and down control inputs of counter module 110 . The output of integrator 114 may be connected to digital signal generator output 11...

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PUM

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Abstract

A digital signal generator apparatus and method are described. The digital signal generator comprises a counter, an integrator and a comparator. The counter incrementally counts or incrementally counts from an initial counter value depending on a counter control input. The comparator has a first input coupled to a counter output, a threshold input, and a comparator output coupled to the counter control input. The integrator has an input coupled to the counter output and an output coupled to a digital signal generator output. The digital signal generator determines a counting direction following an initial direction depending on a comparison between a threshold applied to the threshold input and a counter output value. The digital signal generator may implement an approximate waveform generation with a raised cosine function. The generated waveform may be used to reduce audio artifacts in an audio amplifier during muting operation or canceling muting operation, or during power-on, power-off operation.

Description

technical field [0001] The present disclosure relates to a digital signal generator for reducing audio artefacts in an audio amplifier. Background technique [0002] Audio amplifiers can produce audio artifacts such as audible pops and clicks. These artifacts can occur, for example, when an audio amplifier is switched on or off, or due to muting or unmuting. To reduce such audio artifacts, the voltage applied to the amplifier may be gradually increased or decreased when powering on or off the amplifier or performing a mute / unmute operation. Contents of the invention [0003] Various aspects of the disclosure are defined in the appended claims. In a first aspect, there is provided a digital signal generator for reducing audio artifacts in an audio amplifier, the digital signal generator comprising: a counter having a counter output and configured to depend on a counter control input from an initial counter value begins counting up or counting down; a comparator having a ...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F3/187
CPCH03F1/26H03F3/187H03F2200/03H03G3/348H03G3/3026H03G5/165H03F3/181H03F2200/264
Inventor 罗伯特·范费尔德温哈立德·马布图尔德米特里·安德列维茨·舍韦德
Owner NXP BV
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