Active and passive noise reduction combined sound pickup
An active noise reduction, active and passive technology, applied to microphones, microphone ports/microphone accessories, electrical components, etc., can solve problems such as sound signal interference, reduced sound signal accuracy, and poor accuracy of pipeline positioning results. Achieve the effect of reducing the interference of external noise, reducing interference and accurate sound signal
Pending Publication Date: 2021-04-02
湖南普奇地质勘探设备研究院(普通合伙)
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Problems solved by technology
[0004] The main purpose of the present invention is to provide a pickup combined with active and passive noise reduction, aiming to solve the problem that the acquisition of the sound signal by the existing pickup sensor is easily disturbed by the external environment, resulting in a decrease in the accuracy of the sound signal collected by the pickup, making the final The problem with the poor accuracy of the pipe positioning results
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[0030] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0031] The invention proposes a sound pickup combined with active and passive noise reduction.
[0032] as attached figure 1 And attached figure 2 As shown, in an embodiment of a pickup combined with active and passive noise reduction proposed by the present invention (hereinafter referred to as a pickup), the pickup includes an outer isolation cylinder 110, an inner isolation cylinder 120, a sound collecting chamber tube 180, a first The elastic layer 160 , the second elastic layer 170 , the piezoelectric ceramic sheet 370 , the contacts, the output cable 240 , the output antenna 230 , the microphone 220 , the active noise reduction module 190 and the battery 210 .
[0033] The inner isolation cylinder 120 is fixedly connected to the inside of the outer isolation cylinder 110, and the inner isolation cylinder 120 ...
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The invention discloses an active and passive noise reduction combined sound pickup, and the pickup comprises an outer isolation cylinder, an inner isolation cylinder, a sound collection cavity cylinder, a first elastic layer, a second elastic layer, a piezoelectric ceramic piece, a contact piece, an output cable, an output antenna, a microphone, an active noise reduction module and a battery; theinner isolation cylinder is fixedly connected to the interior of the outer isolation cylinder; the opening of the inner isolation cylinder and the opening of the outer isolation cylinder face the same direction; the first elastic layer is fixedly connected to the inner wall of the inner isolation cylinder; and the second elastic layer is fixedly connected to the opening of the inner isolation cylinder and the opening of the outer isolation cylinder. According to the active and passive noise reduction combined sound pickup, the active noise reduction and passive noise reduction can be combined, so sound signals acquired by the sound pickup are more accurate, the interference of external environment noise is greatly reduced, and the accuracy of a final pipeline positioning result is improved.
Description
technical field [0001] The invention relates to the technical field of sound pickups for pipeline positioning, in particular to a sound pickup combining active and passive noise reduction. Background technique [0002] Underground pipelines are regarded as the lifeline of cities, but at present, the distribution of underground pipeline networks in many cities in China is unclear. Due to the intricate burial of underground pipelines, there are many burial situations that do not match the construction drawings, resulting in the inability to correctly locate underground pipelines. Maintenance has caused troubles, waste of manpower and material resources; at the same time, because the pipeline cannot be located when the pipeline is damaged, this will also make the detection impossible, resulting in a large waste of water resources. [0003] Due to the corresponding sound signals generated by the medium flowing in the underground pipeline, these sound signals are mainly collected...
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IPC IPC(8): H04R1/08
CPCH04R1/08H04R2410/00
Inventor 陈波
Owner 湖南普奇地质勘探设备研究院(普通合伙)