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Audio frequency processing circuit and earphone

An audio processing and signal processing circuit technology, applied in transducer circuits, earpiece/headphone accessories, electrical components, etc., can solve problems such as audio noise, and achieve the effect of eliminating noise, eliminating interference, and reducing noise

Active Publication Date: 2015-06-17
QINGDAO GOERTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an audio processing circuit and earphones to solve the problem of noise in the played audio and the picked-up audio when the existing earphones are connected to the same audio device to perform audio playback, audio pickup and charging at the same time

Method used

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  • Audio frequency processing circuit and earphone
  • Audio frequency processing circuit and earphone
  • Audio frequency processing circuit and earphone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 2 As shown, the audio processing circuit provided by the embodiment of the present invention may mainly include: a third resistor R3, a sound playback circuit 11, a sound pickup circuit 12, and an audio interface 13 for an external audio device; wherein, the third resistor R3 is connected to Between the common terminal GND2 of the audio interface 13 and the ground terminal GND of the audio processing circuit, the resistance thereof is much larger than the equivalent resistance of the signal line in the audio processing circuit.

[0029] The playback circuit 11 includes a differential input circuit 112, a playback signal processing circuit 113 and a playback device 114, and the audio interface 13 sends the audio signal from the audio device into the differential input circuit 112 for differential input processing, and then enters the playback signal The processing circuit 113 performs playback signal processing, which is finally output by the playback dev...

Embodiment 2

[0037] Such as image 3 Shown is a circuit diagram of the audio processing circuit in the embodiment of the present invention. Wherein, the audio processing circuit includes a third resistor R3, an audio interface, a left channel playback circuit, a right channel playback circuit and a pickup circuit.

[0038] Wherein, R3 is connected between the common terminal GND2 of the audio interface and the ground terminal GND of the audio processing circuit, and its resistance value is much larger than the equivalent resistance of the signal line in the audio processing circuit.

[0039] The audio interface 31 comprises a first interface 1, a second interface 2, a third interface 3 and a fourth interface 4, wherein the first interface 1 is a pickup interface for an external audio device audio input interface, and the second interface 2 is a public interface. Terminal GND2; the third interface 3 and the fourth interface 4 constitute the playback interface, wherein the third interface 3...

Embodiment 3

[0052] An embodiment of the present invention provides an earphone, such as Figure 4 As shown, the earphone may include: a charging circuit, a battery 42 and an audio processing circuit, wherein the charging circuit is connected to the charging interface of the audio device and the battery 42 to charge the battery 42; the audio processing circuit is connected to the audio output interface of the audio device and an audio input interface, process and output the audio signal of the audio device, and pick up the audio signal and process it and transmit it to the audio device; the battery 42 is used for powering the audio processing circuit. Wherein, the audio processing circuit is the same as the audio processing circuit described in Embodiment 1 or Embodiment 2.

[0053] The entire earphone takes the potential of the ground terminal GND of the audio processing circuit as the zero potential reference.

[0054] Such as Figure 4 As shown, the charging circuit includes the charg...

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PUM

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Abstract

The invention discloses an audio frequency processing circuit. The audio frequency processing circuit comprises a sound playing circuit and a sound pickup circuit. The audio frequency processing circuit further comprises a third resistor, which is connected between a public end of an audio frequency interface and a grounding end of the audio frequency processing circuit; and the sound playing circuit comprises a differential input circuit, a sound playing signal processing circuit and sound playing equipment, and the sound pickup circuit comprises the sound pickup equipment, a sound pickup signal processing circuit and a reverse phase proportion summation circuit. Correspondingly, the invention further discloses an earphone which comprises the audio frequency processing circuit, according to the audio frequency processing circuit and the earphone, noise on the sound pickup circuit and the sound playing circuit caused by interference of charging current can be effectively eliminated and reduced, and the grounding current noise of the earphone and audio frequency equipment due to ground sharing of multiple paths can also be eliminated.

Description

technical field [0001] The invention relates to the technical field of audio processing, in particular to an audio processing circuit and earphones. Background technique [0002] At present, the application of headphones has become more and more common. Many wireless headphones can not only be used wirelessly, but also have a wired jack at the same time. The earphone can not only play audio information in a wireless manner, but also can be connected with an audio device (such as a PC, etc.) with an output function through a wired jack, and play audio information in a wired manner. [0003] Headphones are generally powered by rechargeable batteries. When the battery is low, the battery needs to be charged. You can also play audio while charging and pick up sound through the headset microphone. When the headset is connected to the same audio device for audio playback, pickup and charging, under normal conditions, the charging current in the headset returns to the audio devic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00H04R1/10
Inventor 韩盈盈吴凡
Owner QINGDAO GOERTEK