Design Goal

1
Design Goal
TEAM W3Digital Voice Processor 525
Jarrett Avery Sean Baker Huiyi Lim Sherif
Morcos Amar Sharma
Date 1/25/2006 Design Proposal

• Design an Analog-to-Digital Conversion chip to
  meet demands of high quality voice applications
  such as Digital Telephony, Digital Hearing Aids
  and VOIP.

2
Why DVP-525?

• Customers in Pain
• Government and Security Agencies
• Hearing Aid Owners
• Digital Voice Providers
• Vonage, Skype, and CRM
• Impact On Customers
• Secure Private Telephony
• Custom Hearing Aids for Specific Conditions
• Better-Cheaper Telephone Service (VOIP)
• More Accurate Speech to Text

3
Applications

• Any Communication Device
• Encrypted Digital Telephony
• Digital Hearing Aids
• Voice Over IP
• Speech Recognition

4
Alternative Project Ideas

• Shoe Odometer
• Digital Equalizer
• ADC Health Monitor
• Multi-Single Channel Audio Converter
• Video Over CAT-5
• SMART Smoke Detector
• Auto Swiss Army Knife

5
Design Breakdown
6
Overall Chip Block Diagram
Sample Delta Sigma Analog to Digital Converter
7
Transistor Estimate

• Analog
• 4 x Analog Op Amps, 4 x 24 96
• Capacitive Resistive Elements
• Digital
• 5 x 8-bit Adder, 5 x 2300 11500
• 3 x 8-bit Multiplier, 3 x 2100 6300
• 1 x 8-bit Divider, 1 x 4800 4800
• Total Transistors 23,176 (9,300 Design)

8
Design Decisions

• Chose Delta-Sigma Modulator
• Continuous Time instead of Discrete
• Decimator
• Digital Low Pass 8-Bit Output
• 3-5 Stage Sync Filter
• Multiplier/Divider/Adder
• Non-floating point
• 16-Bit Output

9
Problems and Questions

• What is minimum clock speed to work?
• 20Hz to 20KHz _at_56Kbit/s
• Complexity of Modulator/Decimator
• 2nd Order instead of 1st Order?
• Stability of Modulator Ideal Op Amp
• of Stages for Decimator
• Possibility of Last Stage Function
• . Are we Crazy?