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Design Specification
1. Noise Cancelling Algorithm[1]1-1. Specter Subtraction Method (SS Method)
1-2. MAP method using Variable Speech Distribution
1-2-1. MAP Estimate Method
1-2-2. Speech spectrum distribution proposed by T.Lotter and P.Vary
1-2-3. Variable Speech Distribution
2. Implementation of the Noise Cancelling System
2-1.Separating into the Hardware and the Software
2-1-1.Features of the HW and the SW
2-1-2. Feature of Noise Cancelling System
2-1-3. Architecture
2-2. Hardware
2-2-1. Processing flow
2-2-2. Circuit structure
2-2-3. HW timing
2-3. Software
2-3-1. Source code
2-3-2. Flow chart
3. Development Environment
3-1. Hardware Design Process
3-1-1. Design Hardware Logic
3-1-2. Manual of Xilinx ISE and EDK
3-2. Software design process
4. Contest Design Target
5. SPEED and AREA
6. References
7. Download
17th LSI Design Contests・in Okinawa Design Specification - 2
2. Implementation of the Noise Cancelling System
The Noise Cancelling System should adapt in some situations and perform in real time with high quality. Various Noise Cancelling Systems are proposed today. When this system is implemented in many kinds of terminals, flexibility and real time processing are needed to adapt to changes in the environment.
Board ： ATLYS by DIGILENT co.
FPGA ：Xilinx SpartanR-6 LX45 FPGA in a 324-pin BGA package
Operating frequency：100MHz
Audio ：AC97 Audio Codec
Sampling frequency：48kHz
FFT Points：64
Figure 3
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