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Digital AM Receiver System

Digital AM Receiver System. Hassen Abdu, Ebad Ahmed, Wajahat Khan April 21, 2005 6.111 Introductory Digital Systems Laboratory. Overall System. Hassen: Analog Front End & Video Display Ebad: User Interface Wajahat: Digital Signal Processing. Digital AM Receiver System.

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Digital AM Receiver System

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  1. Digital AM Receiver System Hassen Abdu, Ebad Ahmed, Wajahat Khan April 21, 2005 6.111 Introductory Digital Systems Laboratory

  2. Overall System • Hassen: Analog Front End & Video Display • Ebad: User Interface • Wajahat: Digital Signal Processing

  3. Digital AM Receiver System • Our system receives the entire AM frequency band (530kHz-1700kHz) • Signal Processing done in the digital domain to demodulate AM signals • User-programmable and customizable

  4. Implementation of Analog Front End • The Analog Front End will: • Receive the AM frequency band by resonating at the center frequency of the AM band and filtering any frequencies above 1700kHz • Amplify the received AM transmission • Digitize the analog signal to be used by the DSP module • -12 bit samples at 3 Msps (caution: Nyquist rate)

  5. Digital Signal Processing • Sampling • Down-conversion • Low-pass filtering • Decimation

  6. User Interface Video Radio frequency Analog Front End Audio signal ADC (>= 3 Msps) Down Converter Low Pass Filter DAC (Audio controller) Data Co-efficients Co-efficients Memory Memory DSP Block Diagram

  7. The User Interface • Users interact with the core of the system through the user interface • Three main features available: • Select/Play a particular AM channel • Pause/Replay a live transmission • Bookmark favorite channels

  8. Block diagram for the User Interface output frequency (to DSP) Inputs (from switches) FSM channel select Memory (for Pause/ Replay) synchronized inputs memory control pause/replay bookmark memory data ROM data Synchronizer ROM control (from FSM) Table Lookup ROM (for bookmarks)

  9. Implementation of Video

  10. Implementation of Video • Video Display will: • Display AM radio station information • (ie. Name, Number, Category) • Display a user menu so the user can customize the Digital AM Receiver System • Display the frequency content of the channel • (Fourier Transform)

  11. Time Line • Individual Module Implementation • April 29 • System Integration • May 5 • System Enhancements/Debugging • May 8

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