A circuit and method for reducing the loop noise of an active earphone

Abstract

The invention provides a circuit for reducing the noise of the active earphone loop, which includes an integrated circuit module and a power supply module arranged on a PCB, and a capacitor is connected between the integrated circuit module and the power supply module, and the capacitor is arranged on the integrated circuit module One side; also includes a grounding wire arranged in parallel with the power line, the horizontal distance between the power line and the grounding line is less than or equal to 1 / 2 of the total width of the power line and the grounding line, and one pole of the capacitor passes through the power line It is electrically connected to the power pin of the integrated circuit module, and the other pole is electrically connected to the ground pin of the integrated circuit module through the ground wire. The present invention also provides a method of reducing the loop noise of active earphones by arranging the capacitor along the direction of the current flowing through the power line and shortening the distance between the power line and the ground line to minimize the current loop area . The invention has low cost, high efficiency and wide applicability.

Description

technical field [0001] The invention relates to the technical field of earphone noise reduction, in particular to a circuit and method for reducing loop noise of an active earphone. Background technique [0002] Active earphones, including wireless earphones with a transmitter device, have a structural feature that the loudspeaker and PCB circuit board used are all arranged in the ear shell. Due to the limited space in the ear shell, this limits the distance between the speaker and the PCB circuit board to be very close, and can only be adjusted within a small range. [0003] The integrated circuit module in the active earphone PCB circuit board in the prior art will inevitably form a noise source due to the fluctuation of the internal current during operation. Due to the close distance between the speaker and the PCB circuit board, these noise sources are likely to form a current loop in the power supply circuit, or form a noise current path with improperly set electronic ...

AI Technical Summary

Problems solved by technology

[0003] The integrated circuit module in the active earphone PCB circuit board in the prior art will inevitably form a noise source due to the fluctuation of the internal current during operation

Due to the close distance between the speaker and the PCB circuit board, these noise sources are likely to form a current loop in the power supply circuit, or form a noise current path with improperly set electronic devices, such as capacitors, etc., causing magnetic field radiation, and further affecting Loudspeakers generate magnetic interference and create loop noise

[0004] Based on the above analysis, the PCB circuit board used in the existing active earphones is prone to generate loop current, which causes loop noise in the speaker

Images