Device and method for eliminating POP noise of CAPLESS audio power amplifier

An audio and power amplifier technology, which is applied in the field of devices for eliminating POP sounds from CAPLESS audio power amplifiers, and can solve problems such as POP sounds

Active Publication Date: 2011-05-18
临沂经开财金投资发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a device and method for eliminating the POP sound of the CAPLES

Method used

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  • Device and method for eliminating POP noise of CAPLESS audio power amplifier
  • Device and method for eliminating POP noise of CAPLESS audio power amplifier
  • Device and method for eliminating POP noise of CAPLESS audio power amplifier

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Embodiment Construction

[0035] In order to solve the problem of POP sound when the CAPLESS audio power amplifier is turned on or off in the prior art, the present invention provides a device and method for eliminating the POP sound of the CAPLESS audio power amplifier. The present invention is further described below in conjunction with the accompanying drawings and embodiments Detailed description. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0036] When the power supply of the audio power amplifier is powered by positive and negative power supplies, and the DC bias level of its output is approximately zero level, when the audio power amplifier is turned on or off, the output of the audio power amplifier will jump, and the jump will cause POP sound on the earphone. . But when the loudness of the POP sound is very small, outside the hearing range of people, people will not feel the POP sound...

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Abstract

The invention discloses a device and method for eliminating POP noise of a CAPLESS audio power amplifier. In the device, a controllable resistance module is arranged between the audio power amplifier and an earphone; when the audio power amplifier is opened or closed, prolonging change time of bias voltage added on the earphone by controlling the resistance value of the controllable resistance module, so that the bandwidth of the POP noise generated by opening or closing the audio power amplifier can be reduced beyond hearing range. According to the invention, the controllable resistance module is controlled to prolong rise time or fall time of DC bias voltage on the earphone, that is, the change time of the bias voltage added on the earphone is prolonged, thus reducing the bandwidth of the POP noise caused by changing the DC bias voltage on the earphone so as to cause the bandwidth frequency to be reduced beyond the hearing range, thereby reaching the purpose of eliminating the POP noise.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a device and method for eliminating the POP sound of a CAPLESS audio power amplifier. Background technique [0002] At present, the earphone circuit on the mobile phone has two circuit structures: respectively: "Earphone circuit with coupling capacitor (see attached figure 1 )" and "headphone circuit without coupling capacitor (as attached figure 2 )". [0003] There are coupling capacitors in the "headphone circuit with coupling capacitors" (see figure 1 C1 and C2, the capacitance is between 22uF-100uF), its function is to block the direct traffic, that is, the DC signal cannot be transmitted to the earphone through the capacitor, and only the AC signal can be transmitted to the rear earphone through the earphone; The output of the audio power amplifier of the circuit has a DC bias voltage (usually between 0.9V-1.4V), and the AC signal is superimposed on the DC bias vo...

Claims

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Application Information

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IPC IPC(8): H04R3/02
Inventor 赵战克曲廷魏国华孙焘王建成曾宪铮程翠香
Owner 临沂经开财金投资发展有限公司
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