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Automatic Sound Level System: Constant volume at all times
KTH, School of Industrial Engineering and Management (ITM).
KTH, School of Industrial Engineering and Management (ITM).
2019 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Automatisk Ljudsystemsregulator (Swedish)
Abstract [en]

Studies have shown that music has plenty of positive effects on performances in working environments. The purpose of this project was to reap those benefits by developing a prototype that could automatically adjust the volume of a speaker. The prototype was also able to measure the total sound level in the surrounding environment. It would then regulate the speaker’s sound level in accordance with the measured sound and a desired volume set by the user.

The main focus was to measure, filter and calibrate sound and to develop a regulatory system that could control the volume of the sound system.

The final prototype had a user interface with an LCDdisplay and buttons. It had the ability to successfully measure the sound and its amplitude. Calibration of the sound sensor was done using two reference microphones. Measurements at eight different sound levels were taken. A model to convert the digital signal into decibels was then calculated through linear regression with a standard error of 2.9 dB. With this model the prototype could automatically adjust the volume of a Marshall Kilburn speaker to the desired level of 90 dB in approximately 40 seconds.

It was found that the largest limiting factor was the sensor’s ability to pick up different sound sources at longer distances from the sensor. Further work may include optimizing the microphone and making an integrated product that can be applied to any sound system.

Abstract [sv]

Studier har visat att musik har mycket positiv påverkan på effektivitet i arbetsmiljöer. Syftet med detta projekt var att lyfta fram dessa fördelar genom att utveckla en prototyp med förmågan att automatiskt reglera volymen av en högtalare. Tanken var att prototypen skulle kunna reglera högtalarens volym i enlighet med den uppmätta ljudvolymen och en önskad volym angiven av användaren.

Huvudfokus var att mäta, filtrera och kalibrera ljud samt att utveckla en regulator med möjlighet att kontrollera volymen av ljudsystemet.

Slutprototypen hade ett användargränssnitt med en LCDskärm och knappar. Den hade möjlighet att framgångsrikt mäta ljudet och dess amplitud. Kalibrering av ljudsensorn genomfördes med hjälp av två referensmikrofoner och uppmätning med dessa gjordes vid åtta olika ljudnivåer. En modell för konvertering av digitala signalen till decibel beräknades genom linjär regression med ett standardfel på 2,9 dB. Utifrån denna modell kunde prototypen automatiskt justera volymen på en högtalare av typen Marshall Kilburn. Detta gjordes på 40 sekunder då önskade volymen sattes till 90 dB.

Den största begränsningen var ljudsensorns förmåga att uppmäta ljud från ljudkällor som var placerade på längre avstånd från sensorn. Vidareutveckling sker lämpligtvis genom optimering av mikrofonen samt skapa en integrerad produkt som kan tillämpas på godtyckligt ljudsystem.

Place, publisher, year, edition, pages
2019. , p. 56
Series
TRITA-ITM-EX ; 2019:34
Keywords [en]
Mechatronics, Sound, Sensor, Volume, Regulator, Arduino.
Keywords [sv]
Mekatronik, Ljud, Sensor, Volym, Regulator, Arduino
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-264488OAI: oai:DiVA.org:kth-264488DiVA, id: diva2:1373787
Supervisors
Examiners
Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2019-11-28Bibliographically approved

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