A linear array pickup and its control method

Abstract

The invention relates to a linear array pickup and a control method. The linear array pickup with 8 electret microphones is applied in record monitoring and security and protection monitoring of prison dormitories of political-legal departments such as prison detention centers. By means of the specific design of linearly arranging the 8 electret microphones and arranging sound holes in the same direction, through the mutual effects of tiny time differences among the microphones in a sound wave arrival array, algorithm controllable directivity is formed. The microphone linear array has strong suppression function on the far field interference noises; the microphone linear array has good signal collection performance in the noise environment; the acoustic effect of the pickup is improved; in adoption of a built-in noise reduction algorithm, noises resulted from factors such as environments and circuits are greatly reduced; the high quality voice monitoring demands of the key areas of the political-legal departments such as the prison detention centers can be satisfied; the emergency voice information is fully recorded; afterwards reliable trace is convenient; and the reliable voice monitoring has important significance in aspects such as public security, anti-terrorism and anti-explosion of the installation areas.

Description

technical field [0001] The invention relates to a pickup device, in particular to a linear array pickup and a control method. Background technique [0002] At present, the pickups in the field of recording and monitoring applications in prison detention centers generally only include an omnidirectional or cardioid-shaped unidirectional electret microphone. The electret microphone realizes the conversion of audio signals into electrical signals, and then amplifies them through the amplifier circuit. After filtering by the band-pass filter circuit, it is input to the AD or Codec of the camera circuit for sampling, so as to realize the synchronous recording of audio and video. [0003] This kind of pickup is generally a semicircular or panel-shaped structure. The pickup is installed at a height of 1.5m from the ground, and the sound hole points to the sound source and is close to the speaker. The function of this kind of pickup is relatively single. It only has the function of...

AI Technical Summary

Problems solved by technology

The function of this kind of pickup is relatively single, only audio pickup and amplification, it is difficult to realize the application of some specific functions, such as environmental noise suppression, beam forming and beam directivity, etc.

The recorded audio has high ambient noise, and key voice signals are easily submerged in the ambient noise, making it impossible to distinguish

[0004] At present, the pickups on the market are basically unable to meet the needs of sound pickup in complex environments, especially for political and legal institutions such as prisons or places with special requirements for sound recognition

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