Ключевые слова: audience, audio, auditorium, background, blur, business, center, chair, communication, conference, congress, convention, culture, education, empty, equipment, event, focus, hall, horizontal, indoor, indoors, lecture, lecturer, light, meeting, microphone, modern, music, new, podium, presentation, professional, public, room, seat, seminar, sound, speaker, speaking, speech, stage, stand, table, university,