Downlink active noise reduction device and method, and mobile terminal

A mobile terminal and active noise reduction technology, which is applied in the field of communication, can solve the problems of not being able to filter out the noise of local calls and affect the quality of calls, and achieve the effect of improving the reception effect of local calls and having a good market prospect

Inactive Publication Date: 2016-04-13
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a downlink active noise reduction device, method and mobile terminal, which are used to...

Method used

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  • Downlink active noise reduction device and method, and mobile terminal
  • Downlink active noise reduction device and method, and mobile terminal
  • Downlink active noise reduction device and method, and mobile terminal

Examples

Experimental program
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Effect test

Embodiment 1

[0040] An embodiment of the present invention provides a downlink active noise reduction device, such as figure 1 As shown, the device specifically includes:

[0041] The first acoustic wave collector 110 is configured to collect environmental noise signals, obtain a reference signal, and output the reference signal to the adaptive controller 120;

[0042] An adaptive controller 120, configured to calculate a secondary signal for implementing acoustic wave cancellation based on the received reference signal, and adjust the amplitude and phase of the secondary signal forward or reverse based on the received error signal;

[0043] Among them, the calculated secondary signal used to implement acoustic wave cancellation ideally refers to the signal after the phase of the reference signal is flipped by 180 degrees. The phase information of the signal is corrected, and the corrected signal is the calculated secondary signal.

[0044] Further, whether the adaptive controller 120 ad...

Embodiment 2

[0059] An embodiment of the present invention provides a mobile terminal, where the mobile terminal is integrated with the downlink active noise reduction device described in Embodiment 1. Since the structure of the downlink active noise reduction device has been described in detail in Embodiment 1, the integrated structure will not be repeated in this embodiment.

[0060] In order to better integrate the downlink active noise reduction device with the mobile terminal, this embodiment also provides the arrangement positions of the integrated first sound wave collector, the second sound wave collector and the secondary sound field emitter. Specifically, as image 3 As shown, the first sound wave collector is arranged on the back of the mobile terminal; the secondary sound field emitter is the earpiece of the mobile terminal; the second sound wave collector is arranged near the earpiece of the mobile terminal.

[0061] Wherein, the deployment principle of the first sound wave c...

Embodiment 3

[0082] An embodiment of the present invention provides a downlink active noise reduction method, such as Figure 4 shown, including:

[0083] Step S401, collecting environmental noise signals to obtain reference signals;

[0084] Preferably, before this step, it also includes: detecting whether the current environmental noise reaches the set threshold, if so, continue to execute step S401; otherwise, determine that no noise reduction processing is currently required, and end.

[0085] Step S402, based on the reference signal, calculating a secondary signal for implementing acoustic wave cancellation;

[0086] Step S403, using the currently obtained error signal to adjust the amplitude and phase of the secondary signal forward or reverse;

[0087] Step S404, sending out the adjusted secondary signal in the form of sound waves.

[0088] Step S405, collecting the environmental noise signal and the secondary signal in the form of sound waves, superimposing the two to obtain an ...

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Abstract

The invention discloses a downlink active noise reduction device and method and a mobile terminal. The device includes: a first sound wave collector used for collecting an environmental noise signal, obtaining a reference signal, and outputting the reference signal to a self-adaptive controller; a self-adaptive controller used for calculating a secondary signal used for implementing sound wave counteraction based on the received reference signal and forwardly or reversely adjusting the amplitude and phase of the secondary signal based on a received error signal; a secondary sound field transmitter used for sending out the secondary signal adjusted by the self-adaptive controller in a sound wave form; and a second sound wave collector used for collecting the environment noise signal and the secondary signal, superposing the two signals, obtaining an error signal and outputting the error signal to the self-adaptive controller. Through the downlink active noise reduction device, active noise reduction is applied to a mobile phone, thereby improving a local call receiving effect, and the downlink active noise reduction device has good market prospects.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a downlink active noise reduction device, method and mobile terminal. Background technique [0002] In the field of communication, high-noise environments are often encountered, and the impact of noise on voice communication is fatal. Because in a high-noise environment, the voice will be masked by the noise, resulting in a serious decrease in the signal-to-noise ratio, resulting in a decrease in the audibility and clarity of the voice. [0003] Active noise reduction technology was first used as a new technology in military communications. Before the emergence of active noise reduction, only passive noise reduction can be adopted, that is, the entire earmuffs are used to cover the left and right ears, and the sound insulation characteristics of the earmuffs are used, and sound-absorbing sponges are added in the earmuffs to reduce the noise of the arriving person....

Claims

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Application Information

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IPC IPC(8): G10K11/178H04M1/19
CPCG10K11/17823G10K11/1783G10K11/17854G10K11/17857G10K11/17881
Inventor 吴建明
Owner ZTE CORP
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