Power grid frequency acquisition device and power grid frequency acquisition method applied in voice evidence obtaining
A power grid frequency and acquisition device technology, applied in frequency measurement devices and other directions, can solve problems such as verification and inability to use recording, and achieve the effects of low cost, simple structure, and accurate frequency acquisition.
Inactive Publication Date: 2016-06-22
NANJING INST OF TECH
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Problems solved by technology
[0005] The purpose of the present invention is to solve the problem that the existing technology cannot use the complex power grid characteristics of our country to check the recording, and the judicial judgment needs to distinguish the authenticity of the recorded evidence and the accurate recording location. The present invention provides an application The power grid frequency acquisition device and method used in voice forensics can establish a regional power grid frequency database, and can quickly determine the recording location and recording time by checking the recorded grid frequency with the grid frequency of each community
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[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, wherein the schematic embodiments and descriptions are only used to explain the present invention, but are not intended to limit the present invention.
[0035] Such as Figure 1-3 As shown, a power grid frequency acquisition device used in voice forensics includes a frequency acquisition point, a host computer and a database server. The database server processes and saves the signal received by the host computer. The frequency acquisition point includes a precision voltage transformer step-down module, signal conditioning module, anti-aliasing filter module, single-chip microcomputer and wireless communication unit; the precision voltage transformer step-down module, signal conditioning module, anti-aliasing filter module and single-chip microcomputer are connected in sequence; The wireless communication unit described above is connected to th...
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The invention discloses a power grid frequency acquisition device and a power grid frequency acquisition method applied in voice evidence obtaining. The power grid frequency acquisition device comprises frequency acquisition points and an upper computer. Each frequency acquisition point comprises a precise voltage transformer voltage reduction module, a signal conditioning module, an anti-aliasing filter module, a single-chip microcomputer and a wireless communication unit. The upper computer is in wireless connection with the frequency acquisition points through the wireless communication unit. The power grid frequency acquisition method comprises the following steps of (1), arranging the frequency acquisition points in each acquisition cell; (2), inputting the acquired data into a buffer memory for storage; (3), transmitting the acquired data to the upper computer through the wireless communication unit; (4) inputting the received data into a DMA buffer area by the upper computer, and performing frequency calculation; (5), transmitting the data to a database server; and (6) storing the data into the database server. The power grid frequency acquisition device and the power grid frequency acquisition method can realize accurate conversion and storage of power grid frequency signals, thereby quickly constructing a regional-grade power grid frequency database.
Description
【Technical field】 [0001] The invention relates to a power grid frequency collection device and method used in voice forensics, and belongs to the technical field of power grid frequency collection. 【Background technique】 [0002] In voice forensics, the recording signal is acquired, analyzed and evaluated from the perspective of power grid frequency characteristics, and the characteristic parameters related to the recording time and recording location are extracted to identify the recording location, which can be used as a court or other administrative Evidence of departmental accreditation. The power grid frequency can reflect the time and location of voice recording, which has always been a matter of great concern to the public security and judicial departments. [0003] Due to the large frequency fluctuation of my country's power grid, coupled with the complex characteristics of my country's power grid and the large interference of power transmission channels, the freque...
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IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 严晓杰姜海涛杨李星
Owner NANJING INST OF TECH