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Universal audio interface for autonomous use
Trojak, Ondřej ; Šťáva, Martin (referee) ; Levek, Vladimír (advisor)
This text analyses the current situation within the audio signal work field and the appropriate ways of connecting electronic networks for processing blocks. The thesis deals with circuit design, firmware programming and physical realization of a subsequently measured autonomous battery-powered interface which provides volume control of input signals and conversion of different types of connectors and signal lines, consuming low power and adding low noise. The device is also equipped with a phantom power supply for condenser microphones. The control consists of a set of buttons, a rotary encoder and a display unit.
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Audio Amplifier with Network Streaming and Sound Equalization
Liska, Matej ; Zeman, Kryštof (referee) ; Štůsek, Martin (advisor)
Diploma thesis contains the theory for the design and realization of a prototype audio amplifier device with the possibilities of digital or analog input content. It approach the features of D/A converter, analog filtering, volume control and amplification. Besides others, it describes the regulation of supply power voltages for individual active parts of device and approaches the software audio platform for acquisition and processing of audio data, including equalization. The thesis contains an general schematic design, created placement of individual components on board, including their table of descriptions and evaluation of the achieved results, including measured values and graphs.
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Miniature stereoamplifier
Dokulil, Zdeněk ; Mišurec, Jiří (referee) ; Káňa, Ladislav (advisor)
The aim of this thesis was to design and construct a mains powered stereo power amplifier with minimal overall dimensions, equipped with a mute and tone/volume control circuit. The usage of an integrated power amplifier circuit was required. The circuit solution is based on a DC controlled integrated tone and volume control circuit LM1036, power amplifier TDA7262 and a number of supporting circuits for mute switching and temperature protection. An assembled sample of amplifier has 2 x 20 watts of output power, SNR 83,7 dB and a flat frequency response within the range of 3 dB for inputs from 16 to 20 000 Hz.
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Automotive audio amplifier and subwoofer
Kolka, René ; Šotner, Roman (referee) ; Dřínovský, Jiří (advisor)
This thesis deals with the project of two performance amplifiers for a subwoofer and for four basic car loud-speakers. The following part of the thesis is dealing with the power circuits of the amplifiers. The control of the amplifiers is realized by processor. The thesis is also dealing with the problems caused by sound system installation in a car, and concerns mainly with the boosters position and with producing high quality subwoofer and baffle-board.
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Universal audio interface for autonomous use
Trojak, Ondřej ; Šťáva, Martin (referee) ; Levek, Vladimír (advisor)
This text analyses the current situation within the audio signal work field and the appropriate ways of connecting electronic networks for processing blocks. The thesis deals with circuit design, firmware programming and physical realization of a subsequently measured autonomous battery-powered interface which provides volume control of input signals and conversion of different types of connectors and signal lines, consuming low power and adding low noise. The device is also equipped with a phantom power supply for condenser microphones. The control consists of a set of buttons, a rotary encoder and a display unit.
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Audio Amplifier with Network Streaming and Sound Equalization
Liska, Matej ; Zeman, Kryštof (referee) ; Štůsek, Martin (advisor)
Diploma thesis contains the theory for the design and realization of a prototype audio amplifier device with the possibilities of digital or analog input content. It approach the features of D/A converter, analog filtering, volume control and amplification. Besides others, it describes the regulation of supply power voltages for individual active parts of device and approaches the software audio platform for acquisition and processing of audio data, including equalization. The thesis contains an general schematic design, created placement of individual components on board, including their table of descriptions and evaluation of the achieved results, including measured values and graphs.
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Automotive audio amplifier and subwoofer
Kolka, René ; Šotner, Roman (referee) ; Dřínovský, Jiří (advisor)
This thesis deals with the project of two performance amplifiers for a subwoofer and for four basic car loud-speakers. The following part of the thesis is dealing with the power circuits of the amplifiers. The control of the amplifiers is realized by processor. The thesis is also dealing with the problems caused by sound system installation in a car, and concerns mainly with the boosters position and with producing high quality subwoofer and baffle-board.
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Miniature stereoamplifier
Dokulil, Zdeněk ; Mišurec, Jiří (referee) ; Káňa, Ladislav (advisor)
The aim of this thesis was to design and construct a mains powered stereo power amplifier with minimal overall dimensions, equipped with a mute and tone/volume control circuit. The usage of an integrated power amplifier circuit was required. The circuit solution is based on a DC controlled integrated tone and volume control circuit LM1036, power amplifier TDA7262 and a number of supporting circuits for mute switching and temperature protection. An assembled sample of amplifier has 2 x 20 watts of output power, SNR 83,7 dB and a flat frequency response within the range of 3 dB for inputs from 16 to 20 000 Hz.
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The Purpose and Implementation of Fingerprint Scanning in Personal Computers
Varadinov, Petr ; Pecinovský, Rudolf (advisor) ; Rais, Aziz Ahmad (referee)
This diploma thesis deals with fingerprint recognition applied in personal computers. The topic is analyzed both chronologically in historical context and in connection with other biometric methods. The thesis provides a comprehensive survey of the topic. It starts with physical layer, goes through hardware parts and ends with software architecture. A special attention is paid to programming fingerprint recognition support into end-user applications. These are the aims of the thesis: to place the silicon fingerprint sensing technology into the historical context and describe its evolution in connection with personal computers till the present times, to provide the results of market research of fingerprint sensors used in personal computers, to work out the summary of the functions the end-users have at their disposal, to present the market research results of fingerprint software, to work out the overview and the comparison of available software development kits (SDKs) and that of application programming interfaces (APIs) used for the described fingerprint sensor devices, and last but not least to develop a demonstration application that communicates with a fingerprint sensor device. Technical literature, market researches together with my own experience from the work in this field were used so as to meet the set aims. As for the demo application of this technology it is my own innovative approach. The thesis is divided into seven chapters where Chapter II -- Chapter VI directly deal with the mentioned topics. The completion of a missing angle of approach to the subject from end-users' and application programmers' perspective is the main asset of this thesis. The work also allows orientation on the silicon fingerprint sensor market and fingerprint software market. Moreover it shows possibilities how to extend this technology, it provides a detailed analysis of the software layer and presents programming samples showing that show how to use this technology. The demo application allowing audio volume control by a fingerprint device is an innovation in the branch of computer input devices.
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