diplomsko delo
Klemen Leben (Author), Samo Beguš (Mentor)

Abstract

Osnovna ideja je bila izdelava VU metra, ki zajema signal s pomočjo vgrajenega mikrofona ali avdio vtičnice. Za procesiranje signala sem uporabil mikrokrmilnik Teensy 3.2 skupaj z dodatno avdio ploščo za hitrejše procesiranje podatkov. Teensy se programira v okolju »Arduino Sketch«, ki temelji na programskem jeziku »C++«. Za prikaz sem uporabil dva LED trakova, kjer vsak LED trak prikazuje svoj kanal. Dodatno sem uporabil tudi linijski izhod, na katerega lahko priključimo slušalke in v realnem času poslušamo hrup, ki ga krmilnik zaznava na vhodu. Kasneje sem dodal LCD zaslon z ločljivostjo 320x240 slikovnih točk. Na zaslonu je prikazan trenutni aktiven vhod in raven jakosti signala. Za mikrofon je bila v gluhi sobi na fakulteti narejena kalibracija. Pri procesiranju signalov, zajetih s pomočjo mikrofona, pa sem implementiral še frekvenčno uteževanje (»A«). To se zelo veliko uporablja pri merilnikih jakosti signala in je definirano v standardu IEC 61672:2013. Namen frekvenčnega uteževanja je približati odzivnost mikrofona človeškemu ušesu, in sicer tako, da pri procesiranju signala izločimo frekvence, ki soprispevajo k računanju hrupa, ki ga človeško uho ne zaznava. Na koncu sem vse elemente sestavil skupaj v ohišje, ki sem ga narisal v programu Creo Parametric in ustvaril s pomočjo 3D tiskalnika. Končna verzija merilnika jakosti signala prikazuje raven jakosti hrupa na zaslonu in LED trakovih ali pa za zajem signala uporablja telefon, ki predvaja glasbo.

Keywords

merilniki jakosti signala;mikrofoni;3D tiskalniki;jakost hrupa;mikrokontrolerji;visokošolski strokovni študij;Aplikativna elektrotehnika;diplomske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FE - Faculty of Electrical Engineering
Publisher: [K. Leben]
UDC: 621.317.7(043.2)
COBISS: 73587203 Link will open in a new window
Views: 400
Downloads: 93
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Other data

Secondary language: English
Secondary title: LED VU meter
Secondary abstract: Basic idea was to make a VU meter that captures signal with a built-in microphone or a audio socket. For data processing was used Teensy 3.2 microcontroller soldered together with the audio card for faster data processing. Teensy 3.2 can be programmed in program »Arduino sketch«, which is based on programming language »C++«. Two LED strips were used to display current power of detected signal. Each LED strip for each channel. Later was added LCD screen with resolution 320x240 pixels. On display is shown active input and signal strength level. Additionally, was added line-out on which we can connect headphones and listen to the processed noise detected on input. A calibration was done for microphone in anechoic chamber in faculty. Additionally, was implemented frequency weighting (»A«), which is widely used in noise meters and is defined in the standard IEC 61672: 2013. Its purpose is to bring the microphone's response closer to the human ear, so the process unit exclude unnecessary frequencies that contribute to the calculation of noise that the human ear does not detect. At the end, all parts were assembled together into the housing, which was drew in Creo parametric and was created with the 3D printer. The final version of the noise meter displays the signal strength level on the screen and LED strips, or the signal is captured by a phone that plays music.
Secondary keywords: VU meter;noise meter;microphone;3D printer;noise level;microcontroller;
Type (COBISS): Bachelor thesis/paper
Study programme: 1000315
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za elektrotehniko
Pages: 53 str.
ID: 12907177