Perform real-time spectral analysis of sounds. View images with adjustable FFT-resolutions, frequency and amplitude scales, and color schemes. Save and share spectrograms. Access bode plot modes with averaging and maximum calculations.
Learn to read and write the script, a historical writing system. Complete 5 lessons to understand consonant-vowel combinations. Practice writing with guided exercises. View lesson progress and review characters.
Study for the CDL written exam with practice tests containing over 580 questions. Access the CDL manual and free road signs. Review sections on air brakes, combination vehicles, hazardous materials, and more. Track progress and prepare for the exam.