Environmental noise variable-excitation amplitude modulation and frequency modulation detecting and estimating method

A technology for environmental noise and frequency modulation detection, which is used in measuring devices, using electromagnetic means, and measuring ultrasonic/sonic/infrasonic waves to achieve the effect of expanding the detection range
CN103308153BActive Publication Date: 2015-06-24XIAN FEISIDA AUTOMATION ENG
5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAN FEISIDA AUTOMATION ENG
Publication Date
2015-06-24

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides an environmental noise variable-excitation amplitude modulation and frequency modulation detecting and estimating method in order to overcome the technical defect that different types of noise sensors are needed for different environmental noises and to solve the magnetic saturation problem. The method has the advantages that by a common excitation mode of winding a coil on a soft magnetic core prior to powering on, size and direction of electric excitation of the coil are controlled by means of PWM (pulse width modulation) so as to form magnetic fields and hysteresis loops in different intensities, so that frequency and amplitude of received acoustical signalsare changed, and detection range of a sensor is enlarged; detected signals are subjected to frequency reduction, then noise intensity is computed, and the problem that existing moving-coil noise sensors require different types and magnetic saturation for different environmental noises is solved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of environmental noise measurement, in particular to a detection and estimation method for variable excitation amplitude modulation and frequency modulation of environmental noise. Background technique

[0002] With the development of modern urban construction and urban transportation, urban environmental noise pollution has become an important environmental problem faced by major cities in the world; noise pollution has become the fourth largest environmental hazard after water pollution, air pollution, and solid waste pollution; Urban noise pollution has seriously affected people's normal work, study and rest. The number of noise pollution complaints has always ranked first among all kinds of environmental pollution complaints. Timely and accurate detection, analysis and effective control of environmental noise are particularly important.

[0003] At present, the sensors for detecting noise can be divided ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More