CAPSTONE Demonstration Radio TiVo FPGA Thundercats: Hariklia Karagiannis Hasina Jamal Osato Edo-Osagie Brad Mazan Chad Griffith

Problem Overview When a radio listener misses a traffic report or wishes to replay a song that had just passed on the radio, there is no way to go back and re-listen. Radio TiVo is intended to rewind, pause, and playback audio from a radio device.

Interface Radio TiVo Audio Input (Radio, MP3 Player, CD Player, etc.) Audio Output (Earphones, Speakers, etc.) User Buttons LEDs

Controls & Operations 1.Rewind by Increments (Hold < 3 sec) Reverse (Hold ≥ 3 sec) 2.Pause/Play(Unpause) 3.Jump to Live 4.Volume Vol

Block Diagram

Project Status Programmed the FPGA to – interpret user commands – drive RAM – direct the flow of data – control the LEDs Applied a test bench and RAM model to the FPGA code for synthetic testing Acquired all system components

Bring-Up Test Plan, Schedule, and Project Leaders Final Converters Module RAM FPGA Analog Input Module AMP/ Filter ADC AMP/ Filter DAC Analog Output Module FPGA Program Loading Program into FPGA Buttons & LEDs Processing Module 3/2 3/16 3/30 Brad Chad Hariklia Osato 2/20 Hasina

Bring-Up Test Plan Active Low-Pass Filter Objective: Design a smoothing filter to filter out sound frequencies above 20KHz. Generate Signals with different frequencies and input them to the filter. Test voltage output for each frequency value to assure frequencies above 20KHz are filtered out. Also perform test with audio source and speakers to verify sound quality. Signal Generator/ Audio Source Oscilloscope / Speakers

Bring-Up Test Plan ADC/DAC & Filter Objective: Build and test a system that converts analog to digital signals and the reverse. The FPGA is used as the driver. The ADC (ADS7823) to be used for our test design is a 12 bit low power, low cost, 12C serial & 50kSPS mixed signal device. And the DAC (DAC7512) is a 12bit low-power, low-cost & 95kSPS serial input converter. Devices/Equipments: – ADS7823, – DAC7512, – Oscilloscope – Spectrum Analyzer – Signal Generator – Signal Analyzer – Matlab/Pattern Generator, – Multimeter

Bring-Up Test Plan ADC/DAC & Filter Setup/Procedures: – An oscilloscope will be used to monitor the output waveforms clocking the ADC and DAC. An audio source is connected to an amp to verify the analog output signal is centered around 2.5V. – Record the sine-wave amplitudes of the input and output voltages, for different frequencies, using the signal generator – The analog signal at ADC input and DAC output will be measured with a spectrum analyzer and compared qualitatively, along with collected digital data developed with a Matlab program or pattern generator. – An aural test will be made to confirm that the sound quality matches the quality of the sampling rate for the ADC and the DAC. – The output signal, as it is monitored on the signal analyzer, will display a 12 bit number to verify an optimized sample resolution for audio quality. This parameter would also be aurally verified. – The system would operate with a DC power supply of 1.5V to 5V. A multimeter will be used to measure the voltage at the source.

Bring-Up Test Plan ADC/DAC & Filter Audio source/Signal generator Amp Oscilloscop e Spectrum Analyzer ADC MatLab /Pattern generator FPGA DAC Amp Speaker Multimeter Signal Analyzer Measure output signal Observe analog output 0 to 5V range. Analyze dynamic specs. Analog spectral properties. Capture digital data Measure analog signals Display 12 bit number Analog signalsAudio output Digital output ADC module DAC module Digital data Analog output Clearer signals with filter Amplitudes & Freq Xteristics. SNR, THD, FFT Measure and compare analog signal properties. = Test Point

Bring-Up Test Plan FPGA Code & Dev. Board Objective: Store the system logic into the FPGA using a prototype development board. Load a simple test program (oscillating LED/Strobing pins) into the FPGA and verify the control functionality. – Load the same program into Flash and compare the functionality. Configure the proto pins and measure output digital High voltages that will interface with external components. – Reconfigure the proto pins to accept input and verify that the input is valid and can be acknowledged by the FPGA. Test actual code stability, input and output of Dev. Board, and voltages on all proto pins.

Bring-Up Test Plan FPGA & RAM FPGARAM DC Power Supply Write DataRead Data Generate Data Input = Test Point Pattern Generator Logic Analyzer Objective: Integrate the RAM into the system. Use the FPGA to drive the RAM and to perform the device operations. Setup – Generate a 12-bit data string every 20us and control signals using a Pattern Generator. – Send this string to the FPGA as the input data and controls. – Setup test points at the FPGA input, RAM input, and Ram output and send the data to a Logic Analyzer.

Bring-Up Test Plan FPGA & RAM Test Procedure – Use the pattern generator to send mock input data and controls to the FPGA to drive the following operations: – Jump to Begin Requires a 20+ minute digital string – Rewind by Increments – Reverse – Play (Unpause) – Jump to Live – Pause Use the Logic Analyzer to verify that the correct sequence of data is returned for each operation.

Bring-Up Test Plan FPGA/RAM & User Interface FPGA RAM DC Power Supply Write Data Read Data Generate Data Input = Test Point Pattern Generator Logic Analyzer Buttons LEDs Objective: Add buttons and LEDs to the FPGA/RAM subsystem to allow control and feedback of the device operations. Setup – Generate a 12-bit data string every 20us and control signals using a Pattern Generator. – Send this string to the FPGA as the input data. – Setup test points at the FPGA input, RAM input, and Ram output and send the data to a Logic Analyzer.

Bring-Up Test Plan FPGA/RAM & User Interface Test Procedure – Use the pattern generator to send mock input data to the FPGA and exhaustively test all combinations of pressing control buttons to drive the following operations: – Jump to Begin Requires a 20+ minute digital string – Rewind by Increments – Reverse – Play (Unpause) – Jump to Live – Pause Use the Logic Analyzer to verify that the correct sequence of data is returned for each operation. Visually verify that the Power LED is always on when the FPGA is on, and that the Pause or Live Mode LEDs are only on when the device is operating in Pause or Live Mode.

Prototype Final Acceptance Test Objective: The following procedures will verify the prototype requirements of the Radio TiVo device. Device/Radio Interface – The device is detachable - Connect and disconnect the TiVo from the radio without damaging either system. Device Output – Output audio - Play audio from the device output so that an unbiased listener accepts the quality of the audible sound signal. – Drive speakers - Attach speakers and verify that TiVo has an audio output. – Adjust the volume - Adjust the volume control and verify that the volume increases and decreases. This may be achieved by ear. Device Recording – Record from audio input - Play sound from audio history. The device should retrieve a radio signal from a previous period in time and continue playing a delayed audio signal indefinitely for as long as the device is in play mode.

Prototype Final Acceptance Test Device Memory Writing – Store at least 10 minutes of audio - Play sound from audio history that is 10 minutes old. Device Memory Reading – Select incremented history - Press the rewind button for less than 3 seconds. For every press, the device should skip back in the audio history by 15 seconds. – Reverse audio - Hold the rewind button for at least than 3 seconds and the device should skip back in the audio history continuously until rewind is deselected. – Play live audio with a delay of less than 1s - Play audio from TiVo and the radio at the same time and measure the time delay. The time delay should be less than 1 second. – Pause audio - Select pause and the audio should stop playing. Select play and the audio should resume playing from where it left off.

Thank you Bill Wilson, Mentor Dr. Chuck LaBerge, Adviser Dr. Pinkston, Supervisor