Audio processing circuit for eliminating plug-in noise of earphone and line control earphone

Abstract

The invention discloses an audio processing circuit for eliminating plug-in noise of an earphone and a line control earphone. In the earphone, audio transmission lines for transmitting left-channel audio signals and right-channel audio signals are respectively connected with a noise-suppression circuit; each noise-suppression circuit is internally provided with a blocking capacitor and a switching element, wherein one end of the blocking capacitor is connected with one audio transmission line, and the other end of the blocking capacitor is connected with the switching element. According to the audio processing circuit for eliminating the plug-in noise of the earphone, before and after the earphone is plugged in, the switching elements are switched off; when the earphone is plugged in, the imported suddenly-changed DC voltage is transmitted to the switching elements through the blocking capacitor, the switching elements are switched on, the audio transmission lines are grounded through switching paths of the switching elements, and then the output of the plug-in noise is blocked. The audio processing circuit for eliminating the plug-in noise of the earphone has the advantages that the design and structure are simple, and the cost is low; the noise generated when the earphone is plugged in can be completely eliminated. Therefore, the audio processing circuit disclosed by the invention is applied to the design of circuits for all existing four-section line control earphones.

Description

technical field [0001] The invention belongs to the technical field of earphone circuits, and in particular relates to an audio processing circuit for eliminating noise generated during the plugging and unplugging process of an earphone and a wire-controlled earphone designed using the audio processing circuit. Background technique [0002] The existing wire-controlled earphones are generally divided into three-segment earphones and four-segment earphones. For wire-controlled earphones equipped with microphones (such as wire-controlled earphones used in conjunction with mobile phones), the headphone plug generally uses four segments. formula structure, such as figure 1 As shown, from the outside to the inside of the earphone plug, the left channel terminal L, the right channel terminal R, the microphone terminal MIC and the ground terminal GND are defined in sequence. When this four-section wire-controlled earphone is inserted into the host, for example, when inserted into...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing wire-controlled earphones will emit noise when they are plugged into or pulled out of the audio jack of the host, the present invention proposes an audio processing circuit for eliminating the noise of earphone plugging and unplugging. The generated noise signal is effectively suppressed, which in turn improves the overall audio quality of the headphones

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