Ключевые слова: abstract, analog, analysis, audio, background, beat, black, business, call, cardiogram, care, chart, computer, concept, data, design, diagram, digital, display, ecg, economy, electronic, emergency, frequency, graph, graphic, health, heart, heartbeat, hospital, line, medical, medicine, monitor, music, operator, patient, pulse, radio, rate, science, screen, sign, signal, sound, technology, test, voice, wave, waveform,