Computer Science Project

 

 

Recording in garden

To record data in garden I have used the same system but the laptop was powered by a DC/AC inverter. Like we can see in the graphic, intensity of noise corresponds at 6 to 7 PM. At this hour the boys play football in the grass field.

  Garden  
Hours Volts Noise
0 0,013208 30
1 0,013649 31
2 0,013649 31
3 0,013208 30
4 0,014529 33
5 0,014089 32
6 0,01541 35
7 0,018492 42
8 0,019812 45
9 0,024215 55
10 0,026417 60
11 0,025976 59
12 0,026857 61
13 0,026417 60
14 0,025976 59
15 0,025536 58
16 0,026417 60
17 0,026857 61
18 0,028618 65
19 0,024215 55
20 0,022014 50
21 0,019812 45
22 0,019372 44
23 0,01541 35
24 0,013208 30

 

                  Fig.1 Noise evolution

Fig.2 Voltage evolution

 

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Fig.3 Garden system

The DB in Oracle is to test some searches. If I want to know what time the output converter (ADC) has a reading of zero, I make a SELECT with some decisions about the fields.

Fig.4 NDL table

Fig.5 Create command

Home

 

Fig.6 Data

 

 

Searching & Reading

 The searching and reading was centred in the analysis of the recorded data and the writing of the FPR. To understand better what is noise we need to study the sound properties like frequency, wave length, etc.

 

 

Comment

 

References:  SQL - Luis Damas - FCA,  Acoustic Noise Measurements, Bruel&Kjaer

JM Freixo Nunes 2009