Audio output device for preventing crackle

Abstract

The invention relates to an audio output device for preventing crackle, comprising a system controller for outputting a digital audio data; an audio codec for generating a corresponding stimulation audio signal according to the digital audio data; a capacitor, one end of which is connected with an audio output end of the audio codec; a switch, comprising a first end electrically connected with the other end of the capacitor and a second end electrically connected with the ground, and being controlled by a control signal to determine whether the first end and the second end are in two-way conduction; a switch controller for generating a control signal; and a power circuit for supplying electric power. When crackle possibly happens, at least one of the system controller, the audio codec and the power circuit triggers the switch controller to conduct the switch for a while through the control signal. The audio output device provided by the invention can operate in various crackling-possible situations and prevent the crackle caused by surge of positive voltage and negative voltage.

Description

technical field [0001] The invention relates to an audio output device, in particular to an audio output device for preventing pop noise. Background technique [0002] In some cases, a spike will appear on the audio output end of the audio output device, and the so-called popping sound will be generated after the spike is transmitted to a broadcasting device such as a speaker or a headphone. [0003] see figure 1 Shown is a schematic circuit diagram illustrating four conventional explosion-proof circuits. China Taiwan Patent No. 275312 discloses four kinds of explosion-proof sound circuits 11, 13, 15, 17. figure 1 The first explosion-proof circuit 11 shown in (a) utilizes a bipolar junction transistor (BJT) 111 to derive the surge appearing on an audio output terminal 12, so as to prevent the surge from being transmitted to the broadcasting device. figure 1 (b) and figure 1 The second and third anti-explosion sound circuits 13, 15 shown in (c) respectively use correspond...

AI Technical Summary

Problems solved by technology

[0011] It can be seen that the above-mentioned existing audio output device for preventing popping sound obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.

In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but for a long time no suitable design has been developed, and the general products do not have a suitable structure to solve the above-mentioned problems. This is obviously related The problem that the industry is eager to solve

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