Aquisição e Processamento de Biossinais

Signals and Systems
Electronics

Teaching methods: Presential

During contact hours, (theoretical and laboratory classes), expository and demonstrative teaching methodologies respectively are privileged. The laboratory classes will take place in a laboratory that has computers, signal acquisition boards, power supplies, signal generators, oscilloscopes, and other electronic components in order to allow lab assignments to be carried out after theoretical contents exposition.
The non-contact hours are dedicated to the autonomous work, by the student, including the preparation of the work to be carried out, the analysis of the laboratory results obtained and the reports writing.

The main objective of this course is to provide students with specific knowledge in the areas of bio signals acquisition and processing.
It is intended that students acquire knowledge related to the acquisition and conditioning of signals through ADC and additional hardware, adapted to the characteristics of the signals to be analyzed.
Students should also acquire knowledge about digital signal processing in order to analyze and extract the most relevant characteristics of the acquired signals.
At the end of the course, students should be able to design and implement a technological solution, with hardware and software components, that responds to a specific problem of acquisition and processing of the mentioned bio-signals.

1. Biosignals
1.1 – Origin and properties of biosignals
1.2 – Noise and noise sources
2. Analog signals sampling
2.1 – Analog and digital signals
2.2 – Sampling, quantization
2.3 – Time and frequency domains, aliasing
3. Signals acquisition
3.1 – Analog-to-Digital Converters (ADCs)
3.2 – Digital-to-Analog Converters (DACs)
3.3 – Quantization noise
3.4 – ADC performance parameters
4. Signal conditioning
4.1 – Basic circuits with OPAMPS 
4.2 – Isolation amplifier and instrumentation amplifier
4.3 – Signals interference and coupling
4.4 – Analysis and design of passive and active analog filters
5. Digital Signal Processing
5.1 – Discrete-time signal characteristics
5.2 – Discrete-Time Fourier Transform (DTFT)
5.3 – Z Transform and Digital transfer functions
5.4 – Finite Impulse Response (FIR) filters
5.5 – Infinite Impulse Response (IIR) filters
5.6 – Moving average filters
5.7 – FIR  and IIR filters design and implementation
6. Biosignals processing
6.1 – Processing and analysis of biosignal in practical applications

Evaluation method: Evaluation by Examination Only (official designation "Avaliação Exclusivamente por Exame")

Formal written exams and laboratory assignements for all enrolled students.

The Final Grade (FG) of the unit is obtained from the following components:

• Written exam to be carried out at the end of the semester and
• Laboratorial assignments.

The FG is the weighted average of the referred components according to the equation

FG = 0.7 x Exam + 0.3 x PL

To obtain successful in this unit, it is necessary to obtain a minimum weighted FG of 9.5 values (out of 20), and it is necessary to obtain a minimum grade equal to:

• 9.0 / 20.0 points (45%), in the final written exam;
• 10.0 / 20.0 points (50%), in practical work.

Only students who have attended at least 78% of the laboratory classes actually taught are eligible to take the exam.
The maximum number of unjustified absences in the laboratory component is three.

Practical/laboratory work is carried out exclusively during classes.

Working students who are unable to attend the laboratory classes are exempt from the attendance requirement but are still required to complete the assessment of the laboratory component. For this purpose, they must independently complete and submit all practical signal processing assignments. For assignments involving hardware circuit implementation, students will be required to complete and submit the corresponding circuit simulations using PSpice.

NAO