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Design of an Optimal Analogue Microphone System for Best Possible Capture of Incoming Acoustic Signals

Sunnanväder, Johan LU (2016) EITM01 20161
Department of Electrical and Information Technology
Abstract
This project examines how to achieve the best possible capture of incoming acoustic signals in a surveillance camera without overspending. This will be done by designing a complete analogue microphone system to be integrated into a surveillance camera and identify the critical stages in terms of performance. The project will cover the complete analogue signal chain from incoming acoustic signals to analogue-to-digital conversion which covers the following steps: Evaluation of mechanical designs to eliminate undesired acoustic effects, choice of an optimal microphone, design of analogue signal processing such as amplification, filtering and signal level adjustments, evaluation of an optimal signal path for minimal interference and... (More)
This project examines how to achieve the best possible capture of incoming acoustic signals in a surveillance camera without overspending. This will be done by designing a complete analogue microphone system to be integrated into a surveillance camera and identify the critical stages in terms of performance. The project will cover the complete analogue signal chain from incoming acoustic signals to analogue-to-digital conversion which covers the following steps: Evaluation of mechanical designs to eliminate undesired acoustic effects, choice of an optimal microphone, design of analogue signal processing such as amplification, filtering and signal level adjustments, evaluation of an optimal signal path for minimal interference and evaluation of an analogue-to-digital converter.

A complete microphone system has been successfully implemented with the desired performance in terms of frequency response, distortion, noise and dynamic range. This has been done by identifying the limiting factors and adapting the performance of the surrounding components accordingly. (Less)
Popular Abstract
In this project the complete analogue signal chain from incoming acoustic signals to analogue-to-digital conversion is implemented and evaluated. This covers the mechanical design, choice of microphone and OP-amplifiers, power supply voltage regulation and analogue signal processing including amplifier, filters, line driver and attenuator. Each stage is tested separately, and finally, the complete microphone system implementation is tested and evaluated.

The measurements show an outstanding SNR which makes it possible to detect sounds from very far away, the THD is well below 1 %, which can be considered inaudible, and the frequency response is flat for low frequencies and has a peak for high frequencies which may be desired when... (More)
In this project the complete analogue signal chain from incoming acoustic signals to analogue-to-digital conversion is implemented and evaluated. This covers the mechanical design, choice of microphone and OP-amplifiers, power supply voltage regulation and analogue signal processing including amplifier, filters, line driver and attenuator. Each stage is tested separately, and finally, the complete microphone system implementation is tested and evaluated.

The measurements show an outstanding SNR which makes it possible to detect sounds from very far away, the THD is well below 1 %, which can be considered inaudible, and the frequency response is flat for low frequencies and has a peak for high frequencies which may be desired when listening to sounds far away since high frequencies are more easily attenuated. (Less)
Please use this url to cite or link to this publication:
author
Sunnanväder, Johan LU
supervisor
organization
course
EITM01 20161
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Analogue Analog Microphone System Sound Audio Capture Acoustic Signals Electronics
report number
LU/LTH-EIT 2016-506
language
English
id
8880720
date added to LUP
2016-06-14 09:59:06
date last changed
2016-06-14 09:59:06
@misc{8880720,
  abstract     = {This project examines how to achieve the best possible capture of incoming acoustic signals in a surveillance camera without overspending. This will be done by designing a complete analogue microphone system to be integrated into a surveillance camera and identify the critical stages in terms of performance. The project will cover the complete analogue signal chain from incoming acoustic signals to analogue-to-digital conversion which covers the following steps: Evaluation of mechanical designs to eliminate undesired acoustic effects, choice of an optimal microphone, design of analogue signal processing such as amplification, filtering and signal level adjustments, evaluation of an optimal signal path for minimal interference and evaluation of an analogue-to-digital converter.

A complete microphone system has been successfully implemented with the desired performance in terms of frequency response, distortion, noise and dynamic range. This has been done by identifying the limiting factors and adapting the performance of the surrounding components accordingly.},
  author       = {Sunnanväder, Johan},
  keyword      = {Analogue Analog Microphone System Sound Audio Capture Acoustic Signals Electronics},
  language     = {eng},
  note         = {Student Paper},
  title        = {Design of an Optimal Analogue Microphone System for Best Possible Capture of Incoming Acoustic Signals},
  year         = {2016},
}