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Audio noise reduction method and system

An audio noise reduction and audio signal technology, applied in speech analysis, instruments, etc., can solve the problems of residual noise, insufficient noise reduction strength, difficulty in single microphone noise reduction, etc., to filter out noise, improve signal-to-noise ratio, preserve Effects of authenticity and intelligibility

Pending Publication Date: 2022-07-01
SHENZHEN VOXTECH CO LTD
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  • Application Information

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Problems solved by technology

In the scene of large noise, single-microphone noise reduction becomes very difficult. Traditional noise reduction algorithms such as spectral subtraction and Wiener filtering have very limited effects on improving the signal-to-noise ra

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  • Audio noise reduction method and system

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[0033]以下描述提供了本说明书的特定应用场景和要求，目的是使本领域技术人员能够制造和使用本说明书中的内容。对于本领域技术人员来说，对所公开的实施例的各种局部修改是显而易见的，并且在不脱离本说明书的精神和范围的情况下，可以将这里定义的一般原理应用于其他实施例和应用。因此，本说明书不限于所示的实施例，而是与权利要求一致的最宽范围。

[0034]这里使用的术语仅用于描述特定示例实施例的目的，而不是限制性的。比如，除非上下文另有明确说明，这里所使用的，单数形式“一”，“一个”和“该”也可以包括复数形式。当在本说明书中使用时，术语“包括”、“包含”和 / 或“含有”意思是指所关联的整数，步骤、操作、元素和 / 或组件存在，但不排除一个或多个其他特征、整数、步骤、操作、元素、组件和 / 或组的存在或在该系统 / 方法中可以添加其他特征、整数、步骤、操作、元素、组件和 / 或组。

[0035]考虑到以下描述，本说明书的这些特征和其他特征、以及结构的相关元件的操作和功能、以及部件的组合和制造的经济性可以得到明显提高。参考附图，所有这些形成本说明书的一部分。然而，应该清楚地理解，附图仅用于说明和描述的目的，并不旨在限制本说明书的范围。还应理解，附图未按比例绘制。

[0036]本说明书中使用的流程图示出了根据本说明书中的一些实施例的系统实现的操作。应该清楚地理解，流程图的操作可以不按顺序实现。相反，操作可以以反转顺序或同时实现。此外，可以向流程图添加一个或多个其他操作。可以从流程图中移除一个或多个操作。

[0037]一些降噪算法在对音频信号降噪时，对各个频率的音频信号的保留力度几乎是均匀的。也就是说，这些降噪算法对不同频率的音频信号进行相同的降噪处理。因此，经过这些降噪算法处理的音频信号的各个频率的信号保留比例是一致的。然而，携带噪声的音频信号中，不同的频率中包含的有效音频信号是不同的。比如，携带噪声信号的音频信号中的低频部分包含的有效音频信号(即人声声纹)高于高频部分包含的有效音频信号。这些降噪算法在对音频信号进行降噪处理时，没有考虑到音频信号的频率因素，从而导致对不同频率的降噪强度基本一致。比如，使用高强度的降噪算法对携带噪声信号的音频信号进行降噪处理时，在降低高频部分的噪声信号的同时，也会使得低频部分中的有效音频信号被舍弃，从而造成语音失真。在使用低强度的降噪算法对携带噪声信号的音频信号进行降噪处...

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Abstract

According to the audio noise reduction method and system provided by the invention, the gain coefficient corresponding to each frequency unit can be generated by taking the frequency of the audio signal as a unit according to the parameters related to the frequency, and the gain coefficient is used for performing gain processing on each frequency unit. According to the method and the system, the gain coefficient corresponding to the frequency unit containing more effective audio signals is larger, and the gain coefficient corresponding to the frequency unit containing less effective audio signals is smaller, so that the audio signals corresponding to the frequency part containing more effective audio signals are more reserved; and the audio signal corresponding to the frequency part containing less effective audio signals is less reserved, so that the quality of the audio signal is improved, and the fidelity and intelligibility of the audio signal are improved while the noise is reduced.

Description

technical field [0001] This specification relates to the field of audio signal processing, and in particular to an audio noise reduction method and system. Background technique [0002] In many life scenarios, we are surrounded by noise. For a better listening experience, we need to enhance speech. The so-called speech enhancement can also be called noise suppression, that is, to reduce or suppress noise to a certain extent, and improve the quality and intelligibility of speech surrounded by noise. In the traditional method, the acquisition device of the signal source is generally an air conduction element, that is, an air conduction microphone. In a noisy scene, the effective audio signal collected by the air conduction microphone is almost completely covered by the noise. [0003] At present, bone conduction microphones are used in electronic products such as earphones, and there are more and more applications as bone conduction microphones for receiving voice signals. ...

Claims

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Application Information

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IPC IPC(8): G10L21/0232
CPCG10L21/0232
Inventor 郑金波周美林廖风云齐心
Owner SHENZHEN VOXTECH CO LTD