Digitalni brezžični sistem za akustično kitaro

magistrsko delo

Tomaž Vidovič (Author), Iztok Kramberger (Mentor), Marko Kos (Co-mentor)

Abstract

Cilj magistrskega dela je bila izdelava vgrajenega sistema, ki omogoča enostavno in neinvazivno pretvorbo akustične kitare v elektroakustično kitaro. Sistem je bil sestavljen iz oddajnega in sprejemnega modula, med katerima je potekala digitalna brezžična komunikacija na nelicenčnem ISM -pasu 864 MHz. Na oddajnem modulu je bil za pretvorbo akustičnega signala v električni signal uporabljen magnetni odjemnik zvoka, katerega izhod je bil prilagojen z načrtanim avdio predojačevalnikom. Za pretvorbo prilagojenega analognega zvočnega signala v digitalno obliko je bil uporabljen 24-bitni AD -pretvornik. Za napajanje oddajnega modula je bila uporabljena LiPo -polnilna baterija. Na sprejemnem modulu je bil za pretvorbo digitalnega zvočnega signala v analogno obliko uporabljen 24-bitni DA -pretvornik, katerega izhod je bil namenjen priključitvi na ozvočenje oziroma ojačevalec. Na njem je bila tudi implementirana digitalna obdelava zvočnega signala za kontrolo glasnosti in tripasovnega avdio izenačevalnika. Vgrajena programska koda za realno-časovno zajemanje oziroma predvajanje in brezžično pošiljanje zvočnega signala ter koda celotnega digitalnega brezžičnega komunikacijskega protokola je bila izvedena na mikrokrmilniku oddajnega in sprejemnega modula. Iz rezultatov opravljenih meritev prototipnih vezij oddajnega in sprejemnega modula je bilo zaključeno, da realizirani sistem v večji meri ustreza predhodno določenim projektnim zahtevam. Na koncu so bile podane morebitne izboljšave in nadgradnje realiziranega sistema.

Keywords

vgrajeni sistemi;akustična kitara;digitalna brezžična komunikacija;digitalna obdelava signalov;avdio predojačevalnik;magistrske naloge;

Data

Language:	Slovenian
Year of publishing:	2017
Typology:	2.09 - Master's Thesis
Organization:	UM FERI - Faculty of Electrical Engineering and Computer Science
Publisher:	T. Vidovič
UDC:	621.397.444(043.2)
COBISS:	21026582
Views:	1049
Downloads:	165
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Wireless digital system for acoustic guitar
Secondary abstract:	The aim of the master's thesis was to develop an embedded system that enables simple and non-invasive transformation of the acoustic guitar into an electro-acoustic guitar. The system consisted of a transmitting and receiving module, which were connected with digital wireless communication on the unlicensed ISM band 864 MHz. On the transmitting module, a magnetic guitar pickup was used to convert the acoustic signal into an electric signal, which was adjusted with the designed audio preamplifier. A 24-bit AD converter was used to convert the adjusted analog audio signal into digital form. A rechargeable LiPo battery was used to power the transmitting module. On the receiving module, a 24-bit DA converter was used to convert the digital audio signal into an analog signal, which was intended to be connected to the PA system or amplifier. Receiving module also included a digital audio signal processing for volume control and 3-band audio equalizer. Embedded software for real-time sampling, playback and wireless transmission of the audio signal and the software for the entire digital wireless communication protocol was stored and executed on the microcontroller of the transmitting and receiving modules. From the results of the performed measurements of the prototype circuits of the transmitting and receiving modules, it was concluded that the realized system largely corresponds with the predefined project specifications. In the end, possible improvements and upgrades were given.
Secondary keywords:	embedded system;acoustic guitar;digital wireless communication;digital signal processing;audio preamplifier;
URN:	URN:SI:UM:
Type (COBISS):	Master's thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za elektrotehniko, računalništvo in informatiko, Elektrotehnika
Pages:	XVI, 114 str.
ID:	10862958