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Audio active crossover for subwoofer and two satellites
Hikaník, Matúš ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This work deals with design, simulation and construction of low frequency active crossover for subwoofer and two satellites. The gauging fixture contains functions to set crossover frequency, turn the phase of subwoofer channel and to set gain for all five outputs range from -20dB to +20dB. In this device are used Butterworth filters of third order with slope 18dB/oct. This device is cascade three way crossover with adjustable first crossover frequency range from 20Hz to 200Hz. The setting of frequency is realize with logarithmic potentiometers. The second crossover frequency has constant value equals to 1970Hz. In this circuit are used low-noise operational amplifiers NE5532N. As regulators of gain are used potentiometers. The phase invertor used principle of changing connection of operational amplifier from inverting to non-inverting. The result of this work is laboratory gauging fixture. This device has built-in I/O BNC connectors and cinch connectors gennerally used in audio technique.
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Influence of drivers position on the characteristics of the loudspeaker system
Bičan, Jan ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
This thesis deals with the measurement and description of properties of the two-way variable modular loudspeaker system marked as OM-3, especially the influence of the mutual position of drivers on its characteristics. The thesis examines individual factors taking their contribution on characteristics of the loudspeaker system in total. Further it measures and evaluates options of compensations of mutual position changes of drivers using an all-pass filter. Within this thesis is also included laboratory task preparation which is focused on this problematics.
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Class D audio amplifier for active loudspeakers
Cupák, Jan ; Punčochář, Josef (referee) ; Kratochvíl, Tomáš (advisor)
This master's thesis deals with design of D class audio final amplifier, which was output power 400 W for 4 ? load impedance. Designed audio amplifier is specifical for active speaker, which consists of satelite speakers and subwoofer. Further more it deals also with other functional blocks, e.g. balanced input preamplifier, active crossover and protection for safety running. Outcome of this work are schemes of each functional blocks of D class audio amplifier, whose functionality was verified by simulation. Thesis also contains full reference material including mechanical arrangement of functional blocks on printed connection board. The conclusion contains the measured parameters of function blocks of produced prototype and complete photographic documentation.
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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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Influence of drivers position on the characteristics of the loudspeaker system
Bičan, Jan ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
This thesis deals with the measurement and description of properties of the two-way variable modular loudspeaker system marked as OM-3, especially the influence of the mutual position of drivers on its characteristics. The thesis examines individual factors taking their contribution on characteristics of the loudspeaker system in total. Further it measures and evaluates options of compensations of mutual position changes of drivers using an all-pass filter. Within this thesis is also included laboratory task preparation which is focused on this problematics.
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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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Audio active crossover for subwoofer and two satellites
Hikaník, Matúš ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This work deals with design, simulation and construction of low frequency active crossover for subwoofer and two satellites. The gauging fixture contains functions to set crossover frequency, turn the phase of subwoofer channel and to set gain for all five outputs range from -20dB to +20dB. In this device are used Butterworth filters of third order with slope 18dB/oct. This device is cascade three way crossover with adjustable first crossover frequency range from 20Hz to 200Hz. The setting of frequency is realize with logarithmic potentiometers. The second crossover frequency has constant value equals to 1970Hz. In this circuit are used low-noise operational amplifiers NE5532N. As regulators of gain are used potentiometers. The phase invertor used principle of changing connection of operational amplifier from inverting to non-inverting. The result of this work is laboratory gauging fixture. This device has built-in I/O BNC connectors and cinch connectors gennerally used in audio technique.
|
|
|
Class D audio amplifier for active loudspeakers
Cupák, Jan ; Punčochář, Josef (referee) ; Kratochvíl, Tomáš (advisor)
This master's thesis deals with design of D class audio final amplifier, which was output power 400 W for 4 ? load impedance. Designed audio amplifier is specifical for active speaker, which consists of satelite speakers and subwoofer. Further more it deals also with other functional blocks, e.g. balanced input preamplifier, active crossover and protection for safety running. Outcome of this work are schemes of each functional blocks of D class audio amplifier, whose functionality was verified by simulation. Thesis also contains full reference material including mechanical arrangement of functional blocks on printed connection board. The conclusion contains the measured parameters of function blocks of produced prototype and complete photographic documentation.
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