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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

Digital AM Receiver System

Hassen Abdu, Ebad Ahmed, Wajahat Khan

April 21, 2005

6.111 Introductory Digital Systems Laboratory

overall system
Overall System
  • Hassen: Analog Front End & Video Display
  • Ebad: User Interface
  • Wajahat: Digital Signal Processing
digital am receiver system1
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
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)
digital signal processing
Digital Signal Processing
  • Sampling
  • Down-conversion
  • Low-pass filtering
  • Decimation
dsp block diagram
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
the user interface
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
block diagram for the user interface
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)

implementation of video1
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)
time line
Time Line
  • Individual Module Implementation
    • April 29
  • System Integration
    • May 5
  • System Enhancements/Debugging
    • May 8
ad