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Audio Manipulation And Buffers using DSP-BF533 EZ-KIT Lite

ECE 3551 Microcomputer System I Spring 08. Dr. Veton Z. Këpuska By Husain Alotaibi Ahmed Alalyak. Audio Manipulation And Buffers using DSP-BF533 EZ-KIT Lite. Introduction. Audio Manipulation through Changing the gain Introducing a delay Using Low and High Pass Filters (FIR).

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Audio Manipulation And Buffers using DSP-BF533 EZ-KIT Lite

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  1. ECE 3551 Microcomputer System I Spring 08 Dr. Veton Z. Këpuska By Husain Alotaibi Ahmed Alalyak Audio Manipulation And Buffers using DSP-BF533 EZ-KIT Lite

  2. Introduction • Audio Manipulation through • Changing the gain • Introducing a delay • Using Low and High Pass Filters (FIR)

  3. Implementation Scope • -without any push button pressed the audio is transmitted to the speakers with no modification • pressing PF8 will increase the volume of the audio and • LED 1 will be on when the volume is in the first step • LED 1+2 is lit and so on up to LED 5 then it resets • Pressing PF9 will decrease the volume of the audio and • Corresponding to the value of the current volume a specific range of LED’s will be lit to indicate the volume level • Further pressing will decrease the number of lit LED’s until it resets

  4. Implementation Scope • Pressing PF10 • Activates chorus effect and lit LED 3 • Activates Low Pass filter and Lit LED 4 • Activates High Pass Filter and lit LED 5 • Fourth press will reset to default mode • Pressing PF11 will change the spanning with each press until it resets

  5. Preparation SW9 pins are all on Initialization and enabling the six LED’s and the four Push Buttons

  6. Interrupts used

  7. Process processor start at main() in main.c. This program calls a various initialization routines to set up the EZ-Lite boards in a configuration that is needed for audio input/output, then it executes an infinite loop.

  8. Process (continue) This program is an interrupt driven program which means that the computer program only does something when a hardware interrupt is generated. 

  9. Process (continue) File Process_Data will contain the user computational functions In ISR functions will facilitate calling the computational functions and give their output

  10. Effects and implementations • simple operation that can be performed in a DSP on an audio signal to create a volume control • Audio Panning Control uses gain to create a phantom source by varying the gain.

  11. Chorus • Implementation of buffers to create a delay • The buffer will be used to read and write values each sample period, and incrementing to the next memory location for each sample.

  12. Filters • Using MATLAB, we designed two filters and imported their coefficients. • used a circular buffer method to compute the output signal.

  13. Issues • Much significant complication and problems are with the quality of the audio • Noise is the dominant problem in this project

  14. Results & Conclusion Successful development of an acceptable approach to implement popular audio effects The board offers a broad usability in different fields Appreciating this encouraging class

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