9 Sound and voice processing devices for converting and improving quality of sound and voice, namely, signal processor for digitization of signals and for digital processing and algorithm signal processing with digital circuits for supporting persons having limited hearing, voice and audio enhancement transmitters and receivers, microphones and audio speakers for smoother communication by making voices clearer and/or louder, and audio transmitters and receivers, audio speakers and microphones to control and improve audio equipment sound quality; loudspeakers; microphones; personal service robots for assisting humans with household chores and tasks; personal service robots for assisting humans with mobility; personal service robots for assisting the infirm, elderly, and disabled with household or personal tasks; virtual reality headsets; virtual reality head mounted displays; electronic sports training simulators; measuring or testing machines and instruments, namely, scales, bathroom scales, pH meters, salinometers, body fat scales for household use, urinometers, dosage dispensers, dosimeters, pedometers; electric meters; electric magnetic meters and voltage testers; telecommunication machines and apparatus, namely, earphones, headphones, touch screens, touch screen pens, monitoring apparatus (other than for medical purposes), electronic notice boards; digital signage monitors; personal digital assistants; electronic machines and apparatus, namely, wearable computers, computer monitors, computer peripheral devices, scanners, readers in the nature of optical disk readers, memory card readers, optical character readers and replacement parts therefor; dust masks; gas masks; spectacles; eyeglasses and safety goggles; downloadable image files containing information in the field of pharmaceuticals, supplements, cosmetics, foodstuffs, medical care, health care, and nursing care; audio and video recordings featuring information in the field of pharmaceuticals, supplements, cosmetics, foodstuffs, medical care, health care, and nursing care; downloadable electronic periodicals in the field of pharmaceuticals, supplements, cosmetics, foodstuffs, medical care, health care, and nursing care; electronic publications in the nature of books, magazines, brochures, journals, and literature on the subject of pharmaceuticals, supplements, cosmetics, foodstuffs, medical care, health care, and nursing care