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This type of signal analysis is called spectrum analysis. The electronic devices used for vector signal and spectrum analysis are called vector analyzers and spectrum analyzers, respectively.  For my project, I used the FFT method, so my audio spectrum analyzer is a Fouriertype analyzer. As such, it digitizes the time domain signal and then uses DSP techniques to perform an FFT and displays the signal in the frequency domain. The FFT algorithm is mainly a powerful vector analysis tool. My Fourier-type analyzer is actually a vector analyzer.
The various human brainwaves are all in the low-hertz range: much lower in frequency than the human ear can hear. However, it has been shown that if you produce two tones in the frequency range to which the ear responds well, and you make those two tones differ by only a LCD TDA1517 Stereo power amplifier MCP4822 Dual-12-bit DAC SPI SPI BINAURAL BEATS few hertz, then the brain will act as the equivalent of an electronic mixer, and respond to the difference in frequency. By adjusting the frequency difference between the two tones, you can replicate the frequencies used by the various brainwaves.
The second task is determined by the pilot’s switch positions. Power up Initialization • PPS • Ports I/O Download? RB10 == 1 Y Download EEPROM Via UART Tx Sleep N Complete initialization Start timers Y Sleep Non-real-time loop executing when Timer2 interrupt not performing (interruptable) EERPOM Full? N Telemeter data? PWM > 7000 Y Enable transmitter Send data via UART Tx N Log data? PWM > 5000 N Y Get AD7888 A/D data via SPI Get MAX6610 temperature and supply voltage via PIC24 ADC Interrupt-driven real-time loop performed at 25 Hz (~1 ms to perform) Store data on EEPROM November 2010 – Issue 244 Although it is capable of accommodating a microSD card socket, for use as a data storage media and interface with a GPS receiver, I did not use these features.