Audio circuit capable of eliminating moment noises and audio module with the audio circuit
An audio circuit and noise technology, which is applied in the field of audio modules, can solve the problems of being unable to eliminate noise at the input end of the speaker power amplifier, unable to achieve basic noise elimination, and unable to completely eliminate noise, etc., to achieve easy promotion and application, simple structure, and convenient installation Effect
Inactive Publication Date: 2016-06-29
ANHUI HUAXIONG TECH CO LTD
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Problems solved by technology
[0003] However, because the cable length from the plug-in interface of the headphone interface to the headphone power amplifier is generally 80 cm or even longer, when the headphone is plugged in, the speaker power amplifier will amplify the noise introduced by the connection line, causing the speaker to emit harsh noise.
The traditional method is generally to eliminate noise by grounding, but it cannot completely eliminate the noise, but only weakens the noise, and controls the frequency range of the noise within the frequency range of the audio signal, which cannot basically eliminate the noise
In addition, since the frequency range of the noise is controlled within the frequency range of the audio signal, it is impossible to cancel the noise at the input of the speaker amplifier
Method used
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[0011] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0012] see figure 1 , audio circuit main board sound card 1, earphone interface board 2, audio power amplifier 3. The audio circuit is used to eliminate the instantaneous noise, which is the noise generated by the audio power amplifier 3 when the earphone is inserted into the earphone interface board 2 .
[0013] The earphone interface board 2 has a plug-in interface for plugging in with the earphone, and the specific structural diagram of the plug-in interface is not shown. figure 1 In , three ports are equivalently shown, and the network labels of these three ports are HEADPHONEOUT_R, HEADPHONE...
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The invention discloses an audio circuit capable of eliminating moment noises and an audio module with the audio circuit. The audio circuit comprises a main board sound card, a headset interface board and an audio amplifier. The audio circuit is used for eliminating the moment noises; the moment noises are the noises generated by the audio amplifier at a moment when a headset is plugged in the headset interface board; the headset interface board is equipped with a socket for plugging the headset; the main board sound card is designed with two ways of audio signal outputs; one way of audio signal output is directly connected with the audio amplifier; the other way of audio signal output is directly connected with the headset interface board and is electrically connected with the socket; the left channel and the right channel of each way of audio signals are independently designed; the socket generates different level signals according to whether the headset is plugged in or not; and the main board sound card carries out switching output to the audio signals between the two ways of audio signal outputs according to different level signals. The invention also discloses the audio module with the audio circuit.
Description
technical field [0001] The invention relates to an audio circuit, in particular to an audio circuit capable of eliminating instantaneous noise and an audio module with the audio circuit. Background technique [0002] In the traditional design, after the earphone is plugged into the audio jack of the host, the speaker noise is too loud. The reason is as follows. After the audio signal is sent out by the sound card of the main board, it reaches the speaker power amplifier through the headphone adapter board, that is, the headphone interface board. The earphone interface board has a plugging interface for plugging in the earphone, and the earphone is equivalent to a mechanical switch. When the earphone is not inserted into the socket, the audio signal reaches the speaker amplifier after passing through the earphone interface board, and the speaker produces sound; when the earphone is inserted into the socket, the input signal of the speaker amplifier is mechanically disconnect...
Claims
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IPC IPC(8): H04R3/00
CPCH04R3/00H04R2430/00
Inventor 熊世林
Owner ANHUI HUAXIONG TECH CO LTD