Depuration Of Despair

The developed synthesizer system primarily includes a computer, universal serial bus (USB) device, line selector, buffer, filter, and mixer. The computer and USB device are connected via a USB interface. The pulse width modulation (PWM) signal output from the USB device is input into the filter via the line selector and buffer. The PWM signals output from the buffer are P0, P1, P2, and P3. Each of these output three signals from the buffer for a total of 12 PWM signals. There are five PWM signals, including three random or modulation signals from low-frequency oscillators and two rhythm signals. The line selector changes the connection between the USB device output and buffer input using the four control signals output from the USB device, and it changes the PWM signal types of P0, P1, P2, and P3. The first track is performed using a Sallen-Key circuit. This Sallen-Key circuit includes a low-pass filter (LPF), high-pass filter (HPF), and band-pass filter (BPF). A control signal is input into an analog photocoupler, and the cutoff frequencies of the LPF and HPF and the center frequency of the BPF can be controlled. The input signal for the Sallen-Key circuit is P0, the control signal for the LPF is P1, and the control signal for the HPF is P2. The control signal for the BPF derives the logical product of P1 and P2 using the logic circuit. The signal that results from adding the output signals of the LPF, HPF, and BPF is the output signal of the Sallen-Key circuit. The LPF, HPF, and BPF output signals can be isolated using a switch. The line selector changes the signal types of P0, P1, P2, and P3, and P1 and P2 are output from the buffer asynchronously and intermittently. Therefore, the output signal of the Sallen-Key circuit becomes an oscillation sound, which changes intricately.