Digital am receiver system
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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

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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 video

Implementation of Video


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


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