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A method of audio detection

An audio and sampling time technology, applied in the field of audio detection, can solve the problems of false positives, easy missed negatives and false negatives, etc., and achieve the effect of preventing false alarms, eliminating thunder, and comparing thresholds with reliability

Active Publication Date: 2018-08-14
宁波远志立方能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is purely based on the sound level to detect whether to alarm, such as thunder, car whistle, firecrackers and other natural sounds will also trigger the alarm, causing false alarms
At the same time, it cannot be used in noisy environments, and it is very easy to miss and false positives

Method used

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  • A method of audio detection

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0018] like figure 1 As shown, the present invention provides an audio detection method, comprising:

[0019] Step 1. After the audio monitoring is turned on, sample the environmental background noise in the monitoring area with a sampling rate of 44.1kHz and a sampling depth of 8 / 16bit and calculate the energy value corresponding to each sampling point. The sampling time length S1 is 30 seconds. When calculating the energy value corresponding to the sampling point, the integral method is used to accumulate the sound wave area to obtain the energy value of the sound. In this way, a set of energy values ​​is obtained. By comparing the energy values ​​in the group, the maximum value E is obtained. max and minimum E min ;

[0020] Step 2. After sampling the ambient background...

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Abstract

The invention discloses an audio detection method, which comprises the following steps: after audio monitoring is started, environmental background noise is sampled, an energy value corresponding to each sampling point is calculated, and a maximal value and a minimal value are obtained through comparing energy values corresponding to all sampling points during a sampling time of 20 to 40s; sound in a monitoring region is sampled at a sampling time interval deltat of 1 / 64 to 1 / 2s, an energy value corresponding to each sampling point is calculated, an energy value corresponding to each sampling point obtained within a sampling time length S2 is compared with an alarm reference threshold, alarm is triggered when the number of the sampling points whose energy values exceed the alarm reference threshold is larger than a value N / 2, and no alarm is triggered when the number of the sampling points whose energy values exceed the alarm reference threshold is smaller than a value N / 2, wherein the N is a sampling point number S2 / deltat within the sampling time length S2. The method can eliminate surrounding regular noise or surrounding burst noise or interference and can detect abnormal sound.

Description

technical field [0001] The invention belongs to the field of monitoring equipment, in particular to an audio detection method. Background technique [0002] For pure video monitoring, the effect is not good at night and in cloudy conditions, while the sound signal is not affected by light and weather. Audio monitoring products include pickups, players, voice mail systems, recording cards, etc., and the core is the pickup. For audio and video integrated monitoring, the camera is the eyes, and the pickup is the ear. However, it is purely based on the sound level to detect whether to alarm, such as thunder, car whistle, firecrackers and other natural sounds will also trigger the alarm, causing false alarms. At the same time, it cannot be used in noisy environments, and it is very easy to miss and false positives. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the present invention provides an audio detection method, which uses au...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L25/21G10L25/78
Inventor 庞潼川武超苏小智王永辉赵挺
Owner 宁波远志立方能源科技有限公司
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