A noise elimination device

Abstract

The invention provides a noise elimination device, which comprises a delay unit and a control unit; wherein the delay unit is connected between a power output end and a first load in series; under the control of the control unit, the delay unit distributes the current flowing to the first load to prolong the time for an audio circuit to construct a quiescent operating point; the control unit which is connected to the delay unit is used for controlling whether the delay unit works based on the received control signal. The device solves the problem of the prior art that noise is generated when the current rush passes the load at the moment of electrifying, thereby improving the user experience.

Description

technical field [0001] The present invention relates to the communication field, in particular to a noise canceling device. Background technique [0002] With the development of electronic technology, miniaturized electronic products are becoming more and more popular, for example, MP3, MP4, PDA, digital camera (DC), home video camera (DV) and so on. These electronic products are mainly powered by batteries. In order to enhance the battery life, most electronic products adopt the strategy of "on-demand power supply", that is, when the user uses a certain function, the electronic product starts the corresponding power part of the function, so that Reduce unnecessary loss. [0003] The above strategy is more effective for reducing the power consumption of electronic products. However, for audio equipment in electronic products, this strategy will cause the following problems: when the user uses the audio function, the electronic product starts the corresponding audio output c...

AI Technical Summary

Problems solved by technology

[0003] The above strategy is more effective for reducing the power consumption of electronic products. However, for audio equipment in electronic products, this strategy will cause the following problems: when the user uses the audio function, the electronic product starts the corresponding audio output circuit. At this time, the voltage momentarily Rising, generating an impulse current, resulting in the generation of noise (which can be called POP (pop) sound), which reduces the user's sense of experience

Since the human ear is very sensitive, a voltage of about 50mV is applied to R L The sound generated at both ends can be perceived by the human ear. Therefore, the noise (POP sound) generated at the moment of starting the circuit is perceived by the user, which affects the user's experience.

[0005] To sum up, electronic products including audio equipment have the problem of generating noise due to the "on-demand power supply" strategy, which in turn affects the user's sense of experience, and no effective solution has been proposed yet

Images