Road congestion monitoring method based on idling sound frequency spectrums of automobiles
A road and idling technology, applied in the direction of traffic flow detection, etc., can solve the problems of high operating cost and equipment requirements, not being popularized and applied, application costs, etc., and achieve the effect of low operating cost, light weight and low cost
Inactive Publication Date: 2015-01-21
XI AN JIAOTONG UNIV
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
It is mainly for real-time monitoring and discrimination of cameras. These methods require high operating costs and equipment, and are not economical in actual operation.
In addition, there are some other methods that are in the laboratory stage or have mature technology, but their application is restricted by factors such as cost and operation interference, so they have not been popularized and applied.
Method used
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
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0024] A road congestion monitoring device based on the idling sound spectrum of an automobile, including a front-end circuit and a DSP processor.
[0025] For the overall circuit see figure 1 , the main part of the overall circuit diagram is the minimum system of the DSP2812 project, including: power supply circuit, ADC circuit, clock circuit and idle speed sound sensor, including: sound acquisition and amplification circuit, low-pass filter, and level-up circuit.
[0026] The microphone is connected to the SSM2019 input terminal 2-3 in a floating way, the SSM2019 output terminal pin 6 is connected to the ADOP07 resistor-capacitor second-order filter circuit through a 33K resistor, the ADOP07 output terminal 6 is connected to the AD8607 pin 3, and the AD8607 output terminal 1 is connected to the DSP ADCINA1 end.
[0027] The function of the front-end circuit is mainly to collect the sound from the vehicle on the road, and amplify the collected signal for preliminary processi...
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 PUM
Login to View More Abstract
The invention discloses a road congestion monitoring method based on idling sound frequency spectrums of automobiles, which is characterized in that the method is based on the principle that idling sound of automotive vehicles accounts for a higher proportion in the environment in case of a traffic jam. FFT conversion for road sound collected within a certain time is performed, the frequency domain energy spectrums within the low frequency range (20 Hz-40 Hz) under the states of traffic jam and unimpeded traffic are obviously distinguished, and an obvious peak exists at the idling frequency in case of the traffic jam; and the steeping degree of the peak is converted into a factor k through an algorithm, and a road condition judgment standard corresponding to the k value is built. Experiments show that the road congestion can be effectively detected through the calculation of the k value.
Description
technical field [0001] The invention relates to a method for monitoring road congestion and a corresponding monitoring device. Background technique [0002] There are many methods on how to monitor and judge traffic congestion at home and abroad, such as ground sensing loop detection method, camera detection method, and microwave monitoring method. It is mainly for real-time monitoring and discrimination of cameras. These methods require high operating costs and equipment, and are not economical in actual operation. In addition, there are some other methods that are in the laboratory stage or have mature technology, but their application is restricted by factors such as cost and operation interference, so they have not been popularized and applied. Contents of the invention [0003] The purpose of the present invention is to provide a road congestion monitoring method and device based on the analysis of vehicle idling sound. The method uses the principle of spectrum analy...
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 Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G08G1/01
Inventor 杨建国王碧阳石元杰马健熊觊新石佳
Owner XI AN JIAOTONG UNIV