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

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Presentation transcript:

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

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

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

Implementation of Analog Front End The Analog Front End will: 1.Receive the AM frequency band by resonating at the center frequency of the AM band and filtering any frequencies above 1700kHz 2.Amplify the received AM transmission 3.Digitize the analog signal to be used by the DSP module -12 bit samples at 3 Msps (caution: Nyquist rate)

Digital Signal Processing Sampling Down-conversion Low-pass filtering Decimation

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

The User Interface Users interact with the core of the system through the user interface Three main features available: 1.Select/Play a particular AM channel 2.Pause/Replay a live transmission 3.Bookmark favorite channels

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

Implementation of Video

Video Display will: 1.Display AM radio station information (ie. Name, Number, Category) 2.Display a user menu so the user can customize the Digital AM Receiver System 3.Display the frequency content of the channel (Fourier Transform)

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