Noise elimination circuit and method and audio equipment powered by battery

By designing a noise cancellation circuit in an audio device, and using the coordination of control circuits and switching circuits, the problem of noise generation in low power consumption is solved, effective noise cancellation is achieved, and user experience is improved.

CN120166334APending Publication Date: 2025-06-17GEER TECH CO LTD
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Patent Information

Application Number
CN202311729352.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-12-15
Publication Date
2025-06-17

AI Technical Summary

Technical Problem

The ripple noise generated by battery-powered smart wearable products and smart home products in low power consumption passes the line to the amplifier, affecting the user experience.

Method used

Design a noise cancellation circuit, including control circuit, switching circuit and load circuit. When the audio device is in standby state or the power consumption is lower than the preset value, the control circuit turns on the auxiliary power supply circuit and the load circuit to maintain the auxiliary power supply circuit in PWM mode; when the audio is played, the switching circuit is turned off to avoid noise generation.

Benefits of technology

It effectively eliminates high-voltage pulse noise within 20KHz, avoids noise coupling to the amplifier, thereby improving user experience without affecting system efficiency.

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Abstract

The invention discloses a noise elimination circuit and method and audio equipment powered by a battery, and relates to the technical field of audio processing, and the noise elimination circuit comprises a control circuit, a switching circuit and a load circuit. The switching circuit is respectively connected with the control circuit, an auxiliary power supply circuit in the audio equipment powered by a battery, and the load circuit; the control circuit is used for controlling the switching circuit to be switched on when the audio equipment is in a standby state or the power consumption of the audio equipment is lower than a preset value so as to connect the output end of the auxiliary power supply circuit and the load circuit; and when the audio equipment plays audio, the switching circuit is controlled to be switched off so as to disconnect the output end of the auxiliary power supply circuit and the load circuit. The noise elimination circuit can effectively eliminate noise and does not affect the system efficiency.
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