|Title||Digital preamplifier with dynamic crossover filter : Based on a Digital Signal Processor|
|Author||Christensen, Mads Monsen (Ingeniørhøjskolen i København, IHK)
|Supervisor||Baden-Kristensen, Keld (Ingeniørhøjskolen i København, IHK)
|Institution||Ingeniørhøjskolen i København, IHK, DK-2750 Ballerup, Denmark|
|Thesis level||Bachelor thesis|
|Abstract||To create flexibility in the existing products of Helio Audio, a Digital Preamplifier has been developed. The development of the preamplifier focuses on implementing a 2-way crossover filter on a DSP, for a subwoofer and main speakers and a user interface for updating the filter coefficients in real time. The filters are developed as FIR filters in a manner which emulates the magnitude response of analog filters, but with the advantages of digital filters with linear phase.
The challenge of implementing 2-way crossover filter with one having a narrow pass band is solved using multirate processing.
The audio processing is implemented on a SHARC ADSP-21369 DSP and a user interface is imple-mented with a MSP430 MCU, a LCD display and buttons.
The implemented filters are tested to be close to perfect, with measured frequency responses as the test method.
|External partner||Ledere og medarbejdere i private virksomheder|
|Admin||Creation date: 2013-01-02 Update date: 2013-03-14 Source: ihk ID: ihk-12822081 Original MXD|